What is an inline switch

The i inline Dimmer switch function might increase efficiency if it’s small. It is preferred to always use inline function as opposed to macro. An inline switch is really a function that’s expanded in line when it’s called. 1 other point to keep in mind is that it’s only helpful to make the event inline in case the time spent on the span of a function call is more set alongside the function body execution time. The main reason is call to an electronic function is resolved at runtime as opposed to compile time. An easy way to set up a decor element that creates a massive impact is window treatments.

inline switch manufacturer
inline switch manufacturer

In the case the wires are set up backward they can’t light up. As the absolute most popular length and gauge, you should come across these to be the most popular power cable for the light office and household appliances and portable lighting solutions. It is essential to verify your lamp cord includes a plug that’s polarized. A polarized plug has prongs which are various sizes such that it enters the outlet only one way.

Meaning, regardless of what you currently have installed, you might likely change it with a different type of inline switch. Switches control the stream of power through another wire. An inline switch may be set up in a spot that means it is convenient for you really to readily turn the lamp off and on. In the majority of instances, all three kinds of switches may be interchanged. Mercury switches are created with a cylinder that’s partially packed with mercury. Decide where you wish to place the switch to create it simple to use. This advice enables you to comprehend different kinds of wall switches and how their installation processes vary from one another.

All our plug-and-play accessories are specially designed to work together while maintaining the best battery polarity through the whole Yak-Power system. Accessories and decorations allow it to be possible for you really to create a place that’s entirely your own. Most frequent forms of lamps include a switch near the bulb socket, or they don’t really have any switch and are controlled in the form of a wall switch when they’re plugged in. It is essential to unplug the lamp before beginning. If you’re interested in inline switch, AliExpress has found 271 related benefits, so it’s possible to compare and shop! You’ll discover a top quality inline switch at an inexpensive price from brands like MJJC.

Hit the best sum of use and adapters are designed to construct a financial budget. In this application, there’s no need to strip the wire. One problem is I need certainly to plug it in most time I wish to work with it. Therefore, if you’re a multiplayer on-line gamer, the reply is clear. The idea of which the next wire connects to the 1st switch is known as the normal terminal. The trunk of radio stations has 2 forms of 12V power you might utilize. The switch side that’s hollow is the side that’ll be used.

You obtain from the internet service which you would otherwise but for a far lower price. Always place your safety first and be certain the ability supply for the region you’re taking care of is totally off to be able to avoid shock injuries.  Make sure it is off.

Looking for an inline switch manufacturer from China OEM company? Contact us, Sincere Tech is custom plastic injection molding company, offer blow molding, inline switch manufacturing, die casting and metal stmping service to the world.

Hong Kong Plasticity Conference

The 2013 Plasticity conference will be held in Hong Kong in early June, which will focus on the plastic waste problem. The first conference was held on United Nations Sustainable Development Forum in the same term last year.

This conference will be held on June 6. It will explore the solution to the problem of waste plastics. The keynote speakers include Lu Gonghui, the deputy director of Hong Kong Environmental Protection Bureau, and Mike Biddle, founder of plastic recycling enterprise MBA in California and winner of Gothenburg Award for Sustainable Development.

This forum is organized by non-profit organization, Ocean Recovery Alliance, which has offices in California and Hong Kong. The focus of this league is problems of marine pollution, including waste plastics. The American Chemistry Council is also the partner support of this conference.

“By 2013, 40% of the world’s sea surface is covered by some form of floating plastic garbage, which is thought-provoking. More and more companies and organizations are paying attention to the solution to plastic waste problem”, said the organization.

The event will also include the speech of Bayer Material Science and Taiwan Plastic Industry Technology Development Center.

The sponsor said the major intent of this conference is to collect retailers, policy makers, manufacturers and other personages of all circles to discuss the problem.

Plastic Molding Company

The plastic industry is one of the earliest invested businesses after the economic reform and open policy in China. The current decade of the 21st century, the development of the plastic industry and the foreign investments in China, where has gradually introduced into new technology for plastic mold and manufacture process. They make China growing with the mature technology of plastic mold and production capability. In recent years, variety of large fairs of plastic moulds and products were held at Shanghai and Guangzhou year by year. Those fairs successful attracted world wide¨s attentions with excellent technology and low-cost plastic mold and plastic production. That is a representative proof. 
        As a result of mature plastic mold and plastic production technology, the more and more international famous manufacturer came to China and invested to set up factories. So China went by the name of the world factory. The manufacturers from all over the world are much interested in Chinese mature plastic mold and plastic production, but it is not easy to find appropriate cooperative factory for medium and small scaled overseas corporations. They must consider the problems such as the expense of the personnel¨s business trip, the difficulty of language communication and the cooperation production quality. Therefore, lots of manufactures can not make production successfully. It is also difficult to reach the quality standard or to reduce the production cost for the manufacturers that have already made the production in China. 
        As a result of the same cultural background and language between China and Taiwan, in the initial period, Chinese plastic mold technology and plastic production manufacture flow were deeply affected by Taiwan. Taiwan¨s excellent mold technology and plastic production manufacture were acknowledged by the whole world in the last century. Sincere Tech mold. is a plastic molding company which has an excellent mold engineer and sale team from Taiwan. Each engineer in Moly-Mold passed through the government¨s technical examination, and also have technical certificate awarded by the government. They have abundant practical experience in mold technology and plastic production manufacture. And they can provide high-quality production references upon requests of customers.
        Many companies always emphasize their scale and equipment on facing to customers, but they neglect that production should be taken the human as the center. According to engineer particular characteristic, Moly-Mold can provide each visitor on the website with some important messages that are how to deal with customers¨ case and how to control product quality in the whole manufacture process. Please each to look through our website has the patience to visit our homepages. We hope our website can provide you with a message about the comparative professional plastic molding manufacture and production technology.

PP Injection Molding

Throughout 2008 the domestic PP market, the overall PE with similar, but also from the initial price has experienced a smooth, and then start a slow market, and then prices skyrocketing, and then to the market gradually cooling, the sharp reversal of collapse, and finally to the vulnerable process. PP injection molding the first three months of the market has been in the doldrums of the state, approaching the price of pellet powder, the market turnover is very bleak. To the market to start in mid-April, the upstream crude oil prices continue to climb, propylene ferocious price rise, because the cost pressures, petrochemical manufacturers continue to push up prices, market speculation traders warm gradually rising to the May and June were the market price of PP have been had risen to an unprecedented high level, but the market did not fully follow up the High prices, the reaction to the market turnover has not unprecedented amplification, so this wave of market can only go so far, prices in mid to late July has begun, vibration downlink and continued until September; until October, the international financial crisis to the global impact has unlimited zoom, crude oil dropped sharply, the domestic PP market could not escape a fall unprecedented shrinkage of market demand, petrochemical factory inventories high, prices have diving, exacerbated traders panic mentality, PP injection molding market prices plummeted, until the late November only to stabilize the price bottomed, but the rebound is not the strength to the market is still low in mid-December concussion . Center for China’s chemical market analyst network that: In view of the current form of the domestic economic downturn and lower reaches of real estate, automobiles and household appliances, such as frozen products industry are still in the period 2009 PP cannot be optimistic about the market, or to vulnerable main concussion

Injection blow molding

plastic bottle molding Medicines are the largest production and sales of medical plastic products. With the rapid development of the domestic medical industry, the domestic consumption of medicine bottles will show substantial growth. In this regard, the domestic equipment manufacturers should be as hollow as an opportunity to grasp the development trend of plastic bottles, research and development of new high-performance, high-performance bottle molding equipment, and strive to shorten with the international advanced technology and equipment gaps.

The main molding equipment

Plastic bottle blow molding equipment, according to shape in different ways, mainly divided into three types: extrusion blow molding machine, injection blow molding machine, as well as to “squeeze – la – blow” or “Note – la – blow” molding machine. Extrusion blow molding and injection blow molding machine is mainly used for production of medicinal small plastic bottles, to “squeeze – la – blow” or “Note – la – blow” molding machine is used in the production of large bottles. At present in China, Applied Extrusion blow molding and injection blow molding machine manufacturing enterprises of plastic bottles up to.

Extrusion blow molding machine

Extrusion blow molding machinery (including the blow mold) and a lower cost, such as forming the same product, blow molding machinery, injection molding machines cost about 1 / 3 or 1 / 2. At the same time, production costs are also low. As the parison is at a relatively low pressure through the extrusion die molding and low pressure (mostly 0.2 ~ 1.0MPa) under Inflation, and therefore less residual stress in the product, and the resistance to tensile, impact, bending and the environment high performance for various contingencies, with good use of the performance. As the blow mold cavity block only by composition, so by simply adjusting the nose or the extrusion die exit gap conditions, the body can change the bottle wall thickness. In addition, because blow mold can be set to slide at the end of the module, so the bottom of the bottle-shaped body of a larger design flexibility. Extrusion blow molding the shape can be complex, irregular and the overall style of the product, and therefore more suitable for forming HDPE, PP raw materials for hard plastic bottle.

Injection Blow Molding Machine

Injection blow molding machine mainly used for processing of HDPE, PP raw materials for medicine bottles. Injection blow molding equipment, using a small plastic bottle was generally welcomed by pharmaceutical companies. As the injection blow molding of bottles in the molding process, the device can be injection nozzle bottle of injection molding, thus ensuring the accuracy of bottle; followed by a bottle blow molding machine configured mandrel body, the guarantee of the plastic bottle body shape dimensional accuracy.

Injection blow molding can be used a medicine bottle-step two-station or 3-station injection blow molding machine processing. As the two-station injection blow molding machine the lack of a dedicated off bottles and cooling stations, it is difficult to achieve fully automatic counting packaging, resulting in production efficiency was less than 3-position. Thus, in actual production use more of a three-station machine. The aircraft’s three stations to 120 ° angle into the distribution of an equilateral triangle, the first station for the injection molding station, the second station for the blow molding station, the third station for the off bottles and cooling stations. Three-station can be run simultaneously, producing high efficiency, short cycle can be connected with the conveyor automatic counting packaging, truly the whole process of production of pharmaceutical plastic bottle with the staff of the “no contact” order to ensure product cleanliness. Injection blow molding machine could not be forming the shape of complex products, and the shape of the bottle most of the smaller volume (usually 10 ~ 300ml). However, injection blow molding bottle bottle flatness high sidewall thickness uniformity, in particular, between the bottle and the bottle has good sealing performance can reach to prevent the plastic bottle of medicine and external gases of volatile gases to the bottle penetration performance requirements, which makes this bottle in full compliance with the special requirements of pharmaceutical packaging. State Drug Supervisory Authority as early as in the “Ninth Five Year Plan” period on the proposed use of injection blow molding method of producing high-quality plastic bottles. At present, China imported from abroad medicine bottle injection blow molding production lines up to more than 40, with a total production capacity of about 700 million / year.

“Note – la – blow” molding machine

“Note – la – blowing” PET, PP bottle (for filling liquid medicines) machine is divided into two kinds of one-step and two-step models. One-step model is the parison injection, heating parison, the tensile parison and blow molding processes such as product ejection device in the same row for the efficient equipment. According to molding processes, one-step model is divided into three stations (Aoki of Japan, represented by solid machine) and 4-position (in Japan’s precision machinery as the representative) two kinds of machines. The main difference between the two is: “3-station” refers to the injection with the heated parison parison in a process completed, “4-station” refers to injection with the heated parison parison in the two processes to complete. One-step model does not cause secondary pollution products, and a good product identity. Despite higher prices, but to reach the high cleanliness requirements bottles in recent years, the domestic pharmaceutical companies more inclined to use the one-step “Note – la – blow” bottle molding machine. To this end, some equipment manufacturers in the domestic absorption of foreign advanced technology and intensify the development on the basis of foreign equipment could be replaced by one-step models, and have achieved some results.

Two-step model refers to the injection and stretch blow molding process by an independent two machines separately. The first step: from a common injection molding machine injection molding tube, head tube of the bottle part (bottle, screw) had completed its forming; the second step: The tube on the honeycomb heater or automatic cycle of heating on the heat conveyor thermostat, and then moved to the stretch blowing process using compressed air to blow molding. Than the flat bottle, seal well and fast product development, mold fees and costs, lower prices are “two-step” models of advantages, but due to injection blow molding tube and the step-wise, the product identity is poor, and easy to pass pollution, difficult to check by bacteria.

R & D direction

Plastic bottle forming machine up to other hollow plastic molding equipment, specifications of small, fast, high precision and high efficiency. The main direction of its R & D high-speed, high efficiency, energy saving, environmental protection and adaptive quality control.

All-electric one-step “Note – la – Blow” Blow Molding Machine

The recent development of a high response AC servo motor-driven dosing pumps energy-saving systems, injection molding machine has been successfully applied. Similarly, injection blow molding, “Note – la – blowing” plastic bottle molding equipment of the main system power drive can also be portable such systems. The system pressure and flow through precise closed-loop control of servo motor to achieve the energy requirements of the implementing agencies the best matching and automatic adjustment, so as to achieve energy efficiency, improve performance and reduce environmental pollution multitude of purposes.

All-electric one-step “Note – la – Blow” Blow Molding Machine for its precise location, speed, no vibration, high self-cleaning as well as the advantages of high efficiency, high-performance plastic bottle molding machine into the development of hot. The key to development of aircraft types is to achieve turntable body clamping preform molding, stretch blow molding and injection-locking mechanism simultaneously plasticizing institutions of all-electric drive. All electric molding preforms and stretch blow mold body simultaneously locking mechanism design, refer to the all-electric injection molding machine clamping. For the all-electric injection of plasticized bodies, can be completely copy all-electric injection molding machine plasticizing bodies. It can be said, with the all-electric injection molding machine mature technology, which is developing electric-step “Note – la – Blow” Blow Molding Machine is not very great difficulty.

At present the domestic market all-electric one-step “Note – la – Blow” Blow Molding Machine, with Shanghai Machinery Co., Ltd. Ace must be represented by models developed by ASB-15N/10E. The machine uses closed-loop servo system, than the original hydraulic system greatly improved the stability of control, saving up to 40% and a change of hydraulic transmission fluid oil (hydraulic system valves, piping, etc. prone to leak, the use of age is even worse than the old equipment) on the environment, product contamination.

High-speed, high-quality PET, PP preform injection gasoline-electric composite body

The performance of injection plastics sector is directly related to the quality of preforms. Reciprocating screw injection of common plastics, as before and after the plasticizing quality and inconsistent, leading to inconsistent quality preform; and also because the two can be made between injection and plasticizing the same time, reducing production efficiency. Note the use of composite plastics extrusion injection system (to be plasticized with the injection of two kinds of functions from the conventional one component is divided into two parts, namely, an independent servo motor-driven extruder screw plasticizing and hydraulic plunger independent injection, both of the Inter-Noninterference), then to stabilize the PET, PP melt axial temperature and thus to achieve consistency of quality plastics, but also greatly enhance productivity.

Improve the forming rate and yield

Improve production efficiency is the domestic pharmaceutical packaging container injection blow molding equipment, the key to development. Vinda Jiangsu Machinery Co., Ltd. successfully developed the domestic first-step three-station injection blow molding machine, has in recent years is based on 100 production lines each year the size of rapid development. Use of Ouida’s MSZ60L models, the production 30ml × 12 cavity typical of conventional plastic bottles production cycle of only 10S. Zhangjiagang Green Central degradation of complete sets of equipment Co., Ltd to absorb European NOVVAPAX, BEKUM of the technology, has developed solid particles suitable for the production of medicinal polyolefin bottles of high-performance 3 station injection blow moulding machine, the shortest production cycle up to 8s. Machine dual-link mechanical protection, turntable with the opening and closing movements synchronous operation mode, greatly shorten the cycle; use of plasticizing screw extruder, screw aspect ratio increased to meet the transparent PP, PE, PS, PC and other hollow products process needs; preform temperature uniformity, product unparalleled line; with a single beam clamping structure, convenient and quick replacement of mold; machines simple shape is conducive to purification, in line with GNP specifications. Panan triple Pharmaceutical Packaging Co., Ltd. for the production of generic pharmaceutical plastic bottles technical problems, has created a unique high-pressure gas thermostat technology. The technology uses electromagnetic speed control system to replace the inverter system, reducing the machine size, reduced power consumption, and improved use of equipment performance and product quality.

Development of high-performance mold

Although in recent years, many domestic enterprises in the “Note – la – blowing” equipment to spend more energy and money, so that equipment has been reach or approach international advanced level, but because of neglect and efficient accompanying “Note – la – blowing” mold development, and therefore can not play its due role in equipment. This is a bottleneck restricting development of the industry. For relevant domestic enterprises, in order to develop a high level of “Note – la – Blow,” Die, you must use an advanced computer-aided engineering (CAE) technology to the “Note – la – blowing” process simulation, which avoided by experience, trial and error and by way of amending the blindness brought about the end, the mold material, mold cavity ratio of the different blowing Zhang, hot runner nozzle structural design, as well as temperature control, etc. have access to the most optimal results. Multi-layer co-extruded hollow plastic bottle molding machine

Multi-layer composite bottle has to avoid the light transmission and to prevent the infiltration of gases such as C02 performance, to meet certain require special storage conditions required for bio-engineering drugs, has become a major pharmaceutical packaging market, one of the products. For example, the 3-layer co-extruded plastic bottles (the most outer layer of the PA material, the middle layer of PET material, the inner layer of PC material), with good transparency and tightness can be isolated from moisture and oxygen, not only for routine blood products, such as human serum albumin and protein, collagen fibers and other products directly to packaging, but also can be used as a variety of bio-engineering drugs, such as interferon, monoclonal antibody drugs, a variety of packaging materials.

Multi-layer co-extrusion Blow molding machine bottle blow molding machine and other than the greatly increased complexity, especially in the nose design. Current research and development for the aircraft types, the main focus on the following three points: (1) to study the use of a certain range of co-extrusion head to meet the needs of different materials, different layers, and head diameter and other requirements. The nose is a multi-layer co-extruded hollow plastic molding machines of the “heart”, its performance should reach: control at every level to achieve the best condition to achieve the perfect circle and lateral material distribution; can not influence the distribution of the processed material change a wide range of plastic raw materials. Spiral mandrel composite systems are highly adaptable, multi-layer co-extruded nose should be the priority to the use of the system. (2) research portfolio of packaging systems, which can be customized according to different materials which might allow the number of combinations of nose. (3) research-based mechanical procedures in order to determine the number of molding stations, the production speed and size of product design platform.


Medicine bottles are the largest production and sales of medical plastic products, but also a rapid growth of large medical plastic products. The product is inseparable from the production of high-performance, high-performance hollow molding equipment (including mold). As the domestic Blow Molding Equipment, compared with foreign equipment, there is not a small gap, therefore, the domestic hollow plastic molding equipment manufacturers can only grasp the development trend of the bottle, research and development of new plastic bottle molding equipment, in order to gradually narrow the gap with foreign manufacturers , and in the market with rival.

custom injection molding service

China Plastic Mold Company is a professional custom plastic injection molding service company, offering customers the best plastic injection moulding products.

First we will share you some plastic injection molding sort:

Use mold-volume business with low cost, easy processing quality control characteristics, particularly applicable to mass production. 
Die stamping molds and a plastic mold. Stamping Die processing methods can be classified in accordance with, can be divided into blanking die punching, bending die, die tensile, shear Die, Die flanging, such as plastic mold. Generally used as steel and other metal materials processing.
plastics Processing die by the type of plastic can be divided into thermoplastic and thermosetting plastic mold two categories. 
Thermoplastic is used in the plastic injection mold. 
Heat Solid Mold : 
Die by the press on a fixed mode can be divided into : 
1. Mobile Die: the machine is not fixed, mold filling, open mode, and plastic products removed from the mold, both in the machine outside. This mold structure, creating simple, low efficiency, high labor intensity, apply only to small pieces of the Batch processing.
2. Fixed Die: fixed on the machine, throughout the process, loading, or mold, shape, open mode and the introduction of plastic products, etc. on the machine.Easy-to-use, low labor intensity, high efficiency, mold structure more complex, mainly for mass production. 
According to plastics molding method Categories : 
1. Pressure mold: plastic installed in the heated indoor cavity or feeding, then pressurized. Suppress directly on the plastic cavity pressure. Such Mold Filling Room in the general cavity is one.
2. Transmission mode: Filling in plastic indoor heated become viscous flow state, the plunger under pressure to make cladding material after injection system into full closure of the cavity. 

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Blow Molding Parts

We are a world class blow molding parts leader in the design and manufacture of custom blow molds & blow molded parts. Leading the blow molds industry for more than a quarter century, we have set the standard for Design Innovation of blow molds, Precision Blow Molds Manufacturing, and Customer Support.

We Design Blow Molds, Quick Change Blow Molds, Blow Molds Manufacturer, variety of Blow molds, 2D and 3D design for Blow Molds using solid modeling, Blow Molds of plastic bottles, we supply a wide variety of Blow molds

Our Blow Molds are designed and manufactured with state of the art engineering systems and blow molds manufacturing equipment. We have been building blow molds since 1978.


The rotamoulding process offers more design freedom and flexibility of form than many other moulding techniques. like injection blow molding, Injection Molded Plastic Parts
Despite its simplicity and economical tooling, surprisingly complex forms can be achieved that are unobtainable with other processes. The advantages are many and varied

  • Rotamoulding does not involve high pressures, hence the low tooling costs. When rotational moulding is used as an alternative to injection or blow moulding, tooling cost can be reduced by as much as 80 – 90%.
  • Low tooling costs enable productions runs of less then 100 to be realised, and make economical prototyping possible, particularly for blow moulding. In addition, experimentation with different wall thicknesses, alternative polymers and a wide variety of surface finishes is not prohibitive.
  • but not every plastic injection molding parts can be made in rotamoulding process, some of the need to made in plastic injection molding process, some of them made in blow molding. if you need to reduce your plastic injection molding tooling cost, then find mold manufacturer China companies to support you.
  • Since mouldings do not have to withstand high pressure during the rotational process, they are virtually stress-free. In comparison with high-pressure moulding processes, they are less likely to suffer stress cracking in use.
    It’s easier to make changes to a rotational mould than to other types of mould, with the advantage that lead times can be cut to a minimum. In some cases products can go from CAD concept to production in a matter of weeks. This means that design can reflect market requirements.
    Depending on the design, Hollow shapes can be moulded without seams, sprues or ejection marks.
    Wall thickness normally remains constant throughout the entire moulding and can be even greater than 10mm. If required, it can be Increasedwhere service stress is likely to be applied.
    Screw threads bosses and metal inserts can easily be moulded in, reducing expensive secondary fabrication.
    Excellent load bearing properties can be achieved with twin-wall cavities or by foam-filling the spaces between the walls.
    Rotamoulding is ideal not only for tough rigid shapes but also for flexible mouldings with deep undercuts, used in the manufacture of inflatable products such as rescue crafts and toys.
    Engineering resins can now be rotationally formed to produce mouldings for continuous service in both high and low-temperature environments.
  • Both symmetrical and asymmetrical designs can be formed as well as complex, one piece mouldings impossible with other processes.
    Mould surfaces can be texturedfor safety or aesthetic reasons, or carry moulded-in company logos, information or diagrams.
    Rotamoulding offers great flexibility of size, from small medical squeeze bulbs to bulk storage tanks of over 15,000 litres. However, it is best suited to medium to large mouldings.
    Rotationally moulded engineering polymers can produce high strength, minimum weight mouldings at the lowest possible cost compared with other engineering polymers moulded by other processes.
  • Rotamoulding is one of the few processes that permits undercuts, and if these are small, draft angles can be avoided. In addition, if the design does not necessitate an internal male core, no angled taper is needed.
    It’s easier to make changes to a rotational mould than to other types of mould, with the advantage that lead times can be cut to a minimum. In some cases products can go from CAD concept to production in a matter of weeks. This means that design can reflect market requirements.
    No sprues or runners means low materials wastage. Excess material that is cut from a finished component can be recycled immediately in the factory. In addition, waste-free design can be built into a mould, such as a container and lid moulded together and separated afterwards.
    Rotamoulding offers designers the benefit of recyclability. Mouldings tend to be in one thermoplastic polymer, enabling designers to plan for material recovery.

If you are looking for Rotamoulding service, blow injection molding service, and plastic injection molding service, please contact us.

Increase Your Blow Molding Machine

In the early days of industrial blow molding parts, the processor had quite a few obstacles to overcome, many of which formed bad habits.

Here are a few that come to mind – let’s call these industrial blow molding then:
1. Material and color changeover times ranged from 8 hr to several days depending on the color and material.

2. Poor head designs led to machine downtime and expensive repairs. Many of these occurred every six months or so, amounting to weeks of downtime.

3. Long periods of downtime were spent just waiting for the service tech to arrive to begin to solve the problem.

4. Very basic manuals, schematics, and sequence of operation did not necessarily pertain to your machine as built. Since there are tons of old machines with many “fix up” repairs over the years, these changes have not been recorded in most cases.

5. All of the older machines were semi-automatic and relied on an operator to close the gates and restart the cycle. This gave very unpredictable control of cycle times. And there were no part takeout systems.

6. Mold changeover took a minimum of a full day or even two. Often this also included changing head tooling.

7. Setups from product changes always seem to cause issues, even though the same changeover was done just last week.

8. Cycle times depended on a combination of:

  • parison drop time,
  • press closing time,
  • blow time,
  • exhaust (vent) time,
  • decompression time,
  • clamp opening,
  • gate opening,
  • manual part removal,
  • gate closing,
  • clamp moving to pre-close position.

Due to the many factors involved, these obstacles limited the number of changeovers and different types of parts that could be run on a machine.

Fortunately, developments in machine and processing technologies have removed many of these obstacles, putting injection blow molding companies in a better position to keep the machines and profits up.

Let’s look at industrial blow molding now:

1. Current head technology allows color changes in about 20 min to a maximum of 1.25 hr for the most difficult changeover. Since some blow molders make up to three color changes a day, the savings are huge and drop right to the bottom line.

2. Heads now on the market require little repair or maintenance. The industry has switched from sensitive mica-band head heaters to extruded aluminum and Calrod heaters.

After five years of use, these heaters have not experienced one blow-out as compared with hundreds on the mica band heaters, cutting replacement cost and downtime. Further, a properly designed head will eliminate potential galling from metal-to-metal rubbing on the moving internal sections of the flow paths of plastic materials.

This was a major cause of overly long color/material changeover times. There are heads on the market that allow disassembly/cleaning/assembly to change color or material within 1 hr.

3. It is still not uncommon to have to wait for a service tech to arrive at your plant to fix your machine. But I have found out that about 80% of machine problems today are due to improper setup. These types of problems can be solved by technology that links the supplier directly to your machine for troubleshooting.

Most issues can now be identified and resolved in 1 to 2 hr.

4. Machine manuals can now be made viewed on the machine operator’s computer screen. No need to try to find the original paper manuals that are stored in a locked supervisor’s office at 3 am.

5.   Automated Part Takeout has now become a standard component of the blow molding machine. Automation gives a consistent cycle time. In addition, it now makes sense to include a part-holding fixture with the PTO system. In dual-head operations, the holder prevents the part from dropping until the operator is finished with the first part. The gain here is the possible elimination of a second operator for each shift.

6. Molds are now designed with quick-change connections for water, air, and hydraulics. Some processors now make complete mold changeovers in 15 min. This means more uptime and more profit in your pocket.

The costs to accomplish faster mold changes are nominal. Look at mold positioning gadgets like locater hangers.

In many cases, air, water, and hydraulic manifolds mounted directly on the mold will save many hours thanks to fewer connections to be made. Keep your tools on a wagon for the next changeover. This cuts down on walks across the building to get the necessary tools.

The other area of changeover is the head tooling. It’s usually hot, heavy, and large. Simple tables or adjustable stands to support and guide the tooling into place will save time and make changeovers safer.

How much is all this worth?

Every second saved adds directly to your bottom-line profit. For example, if we can save 3 sec on a 60-sec cycle time with a dual-head operation, and the mold runs for 7000 hr/yr, the benefit is 30,000 more parts/yr.

How do we accomplish this?

Make sure there is no more than 1 sec between starting drop of parison and the extruder reaching shot size. It might be possible to bring the pre-close position closer to the mold-close position. This alone could save 1 sec.

Air blow and vent times are usually the longest parts of the cycle. Shorten the time for air blow and see whether that affects the ability to make an acceptable part.

Check the vent/exhaust time of the air inside the part. Make sure the quick-exhaust valve is large enough to vent out a large amount of air in 5 to 6 sec or less. (I have seen this take 10 to 20 sec or longer with an improperly sized exhaust valve.)

Have the part take out start to remove the part from the mold prior to the gate opening. Only open the mold platens just enough to get the part out with the part take out.

On a single-head machine colors changed from white to dark blue and back to white. Both of these color changes were achieved in a total of about 30 shots (30 min)—for not one, but two color changes.

Looking for blow molding parts? Contact us now to get a price.

Industrial blow molding Machine & Tooling

Industrial injection blow molding evolved from art to science with the marriage of PC controls and proportional hydraulic valves.

Today’s machines are highly efficient and predictable, and can generally be relied on to produce sophisticated parts from the first shot.

Newer parts are now being produced with 50-, 75-, and even 100-lb shot sizes.

Regardless of how technology advances, it’s still wise to brush up on some basic guidelines to help you get started, especially if you’re making a particular part of the first time.

First, determine the specifications of the actual parts you’ll be running. Will it require flash only on the top and bottom of the part? Or maybe the only way to make good parts will be to flash all the way around?

Project the actual finished weight of the part, and then estimate the shot size, taking the flash into account.

Flash only on the top and bottom of the part will mean a complete shot weight about 25% to 40% more than the final trimmed part weight. If the flash is all the way around, this could increase the shot weight by upwards of 60%. I have seen that reach 100%–double the final part weight—for certain parts, so be careful with your estimate.

In most cases, flash can be recycled back into the parts.

Shot size and cycle time will also influence the output requirement for the extruder. To make sure the machine is sized right for the job, a rule of thumb is to project the needed output capacity of the extruder at 80% of its maximum screw speed.

The extruder must be working well to ensure a low melt temperature. The hotter the material, the longer the cycle time.

The finished wall thickness of the part also plays an important role in cycle time.

If the part wall thickness is 0.060 in. or less, the cycle time will be in the area of 40 to 50 sec. A wall thickness of 0.080 to 0.100 in. will result in a cycle of around 60 to 70 sec. Very thick parts with walls of 0.120 to 0.180 in. could result in cycles from 90 to 180 sec.

Be careful, as these are only estimated guidelines. Depending upon tack-offs, for example, handles and very thick areas of the part will influence the overall cycle.

Another matter to be carefully considered is the size of the accumulator head that your part and process will require. Here are some guidelines you might find handy:

Determine necessary head tooling size. You might require larger head capacity than output needs alone would indicate, in order to get proper head tooling size for the part.
Find out the parison layflat needed based upon top/bottom or all around part flash. (Layflat = tooling diam. x 3.14 ÷ 2) This equation does not consider die swell or parison preblow inflation.
Factor in parison die swell. Normally, larger tooling diameters have smaller parison swell. Small tooling produces a larger percentage of swell.
Remember that competitive heads may produce different parison sizes for a given tooling size.
Determine if there is a limit on how much regrind can be put back into the finished part. Some flash requirements might be more that the weight of the finished part.
Based upon maximum shot size, determine head capacity needed. Consider what other parts might be run in this machine and to what specifications.
Select tooling size based on head size. Determine if converging or diverging head tooling is needed. If using dual heads, determine the required head center distance.
Next, you’ll need to identify the actual size of the mold, including any outriggers, cylinders for split molds, water connections, and blow pins. This is extremely important in the event you’ll be running dual heads with side-by-side molds on a fixed-head center line. The platens must be sized to fit the molds on the head centerline.
Now you are ready to determine the clamp tonnage required to mold your part. I use this as a guide:

HDPE: 500 to 600 lb of force per linear in.
HMW-HDPE: 600 to 700 lbf/in.
PP homopolymer: 500 to 600 lbf/in.
PP copolymer: 600 to 700 lbf/in.
Next, calculate the pinch clamp force needed to seal the parison:

Length of pinch x lbf/linear in. ÷ 2000

Find the blowing clamp force (to keep molds closed during air blow):

Projected area of blown section x blowing pressure
(around 100 psi) ÷ 2000

Remember that once you clamp up, the pinch clamp force ends and the blowing clamp force takes over. Don’t add these two values together.