Types of plastic injection molds in China

Types of plastic injection molds in China

injection molds in china

injection molds in china

Plastic injection molds to create objects, molding plastic is forced into the mold cavity. They are often used to scale manufacturing operations, creating new products, such as toys, kitchen utensils, caps, mobile phone sets. You can use the injection mold “flash line” extra plastic around the seams discovery projects. There are four main types of commonly used plastic injection molds.

Cold runner mold

Cold runner mold, injection mold is the most common type. The gates and runner mold used for injection of the plastic in each mold cavity. However, the sprue and runner and some hardened once solidified. Workers then these works and recycling. This may cause the waste problem, which may make their economic use.

Two plate of cold runner mold

Two plate cold runner mold is so named because they are characterized by two plates together. Only a parting surface that must be located in the runner. This is the easiest cold runner mold.

Three plate cold runner mold

Three plate cold runner mold has three, which means that there is one pair of parting planes. Three of the manifold, the movable plate and floating panels. Contains half of the gate hot runner plate and the runner-up. The injection system comprising half of the movable plate and the geometric shape of the part. The other half of the rotor included in the floating plate and geometry. The system can be located in any of the parting, and anywhere on the surface can be selected through the sheet to provide flexibility.

Hot runner mold

Hot runner mold provides a different way of plastic. As part of the runners, although a plastic syringe and cool the cold runner, the hot runner mold in the mold and stored in the temperature higher than the melting point of the plastic. This means that the gate and runner sclerosis will never have a chance. This also reduces the amount of plastic waste. However, the hot runner injection mold requires more skill and maintenance, and have a higher baseline costs. However, they tend to save materials according to their own.

Chinese Injection mold process

Chinese Injection mold production process
Injection mold manufacturing process and production process of other industrial products, are starting from raw materials through various processing into the whole process of the finished product. Many types of mold, its structure, purpose and requirements also vary, but their production processes also have in common, can basically be divided into five main stages: the production of technical preparation stage, the preparation stage of raw materials, parts and components processing stage, assembly and commissioning phase trial identification stage.

1. Production of technical preparation phase: This phase is the basis for the production of molds, molds for quality, cost, schedule, and management has a significant impact. Production technology stage work includes: Die overall design, preparation of component design, process technology files, develop, mold and other materials cost estimate of the fixed and fixed working hours.

2. The raw material preparation phase: This phase should all raw materials for the mold production and one ready. One of the most important work which is ready for all kinds of rough, because the type of injection mold, structural variety, raw materials required are very different, the blank is necessary according to the desired shape of the mold parts, process dimensions, materials, etc. to prepare , to be in the form of rough castings, forgings and under various forms material.
In addition, to complete a mold production, but also requires a lot of purchased parts and spare parts, such as fasteners, standard parts used in the assembly mold etc; factory can not produce or temporarily produce parts, such as templates, mold Block and so on. In short, it is necessary, among other raw materials production molds can be processed in the factory all ready

3. Parts Processing Stage: This stage is an important stage to ensure the accuracy of the mold, which mainly include: machining, special processing, surface processing and heat treatment. Machining is the use of cutting tools for metal materials processing. Is known, the mold is assembled from metal parts almost up. To get the parts comply with requirements of the drawings, the use of mechanical processing is its main tool. Therefore, the machining process is one of the most workload.

Followed by special processing, the structure of the mold rather special. Because plastic is a three-dimensional piece, it is shaped by a combination of male and female mold cavity derived. This cavity with a surface that is difficult to deal with the general machining, even if reluctantly working out, its quality is difficult to guarantee. Therefore, you need to use special processing, such as EDM. Electroforming processing. These special processing has become unavailable or mold indispensable processing methods

The third is the surface finish, the general requirements for plastic surfaces are high, requiring plastic surface gloss, rounded appearance, which requires corresponding cavity surface is very smooth and mellow, are generally due to the cavity surface, with usually difficult to guarantee the quality of machining, which requires specialized mold surface finish, mainly polishing, electrochemical polishing, ultrasonic polishing, pressing polishing, blasting polishing.

Fourth, heat treatment, injection mold production, all important parts to be heat-treated, and some parts have to deal with many times. Since heat is the primary means to change the properties of the metal material. As the mold is generally a single piece production, production costs a lot of money, people always want to make more use of it some time, so that the mold can require durable, and heat can be in part without changing the shape and size of the change in its internal organization and performance is important to ensure that the intrinsic quality of the parts method.

4. Assembly commissioning phase: This phase is to assemble the various parts together and debugged. The quality of assembly work, the quality of the mold walked decisive role. Assembly is a highly technical work, even a small mistake can make a little mold not produce qualified products to. Assembly is generally divided into the component assembly, parts assembly and final assembly, commissioning assembled, which is to adjust the relative positions of the parts, with the gap and structural tightness and so on. This is the key step is easy to use.

5. Try to identify stage: This stage is a good debugging mold mounted on the injection molding machine for trial, according to the design requirements for the operation, see the mold clamping, mold is flexible and meets the requirements, the quality of the resulting plastic article is qualified, thereby to identify whether the molds qualified. If accreditation, considered as a mold to complete this entire process of production

Injection molded plastic products inspection methods in China

Injection molded plastic products quality inspection methods
In China,Whether produced after injection products meet quality standards, must be tested, a common quality test methods are the following two.

injection molded plastic in china

injection molded plastic in china

(1) full inspection

The so-called full inspection is individually tested for injection products, we have talked about “full” refers to the number of all the plastic parts produced, rather than the entire value of the quality characteristics tested. In determining the test items, test cost is usually lower or greater impact on the quality of the quality characteristics of the implementation of full inspection, such as plastic parts Dimensions test is easier and can be fully tested, and the requirements of the position and some plastic parts crucial, a great impact on the quality, but also the need for full inspection. Not plastic parts for each test must be carried out in full, as it is too time-consuming and laborious. Usually occurs when the following conditions using full inspection.

1) found that more unqualified plastic parts, plastic parts or the whole batch are unqualified, the need for follow-up products for full inspection.

High single value

2) injection products, even when a scrap will bring great losses.

3) If the product quality problems, give people life safety or safety hazard when great.

(2) Injection molded plastic sampling inspection

The so-called sampling inspection,, is from a group of randomly selected plastic part of the test conducted. By this test section of plastic parts extracted to make the evaluation of quality of these plastic parts. Compared with the full inspection sampling inspection, it tested a small number of plastic parts, low-cost test, test speed. Sampling inspection and batch size of the number of samples, volume, sample quantity; small quantities, less sampling; as long as the appropriate number of samples, the test results have a high accuracy. Usually by random checks in the following cases.

1) Some of the Injection molded plastic parts of the mechanical and physical properties of the need for destructive testing, this will bring damage to the plastic parts.

2) more than the mass production of plastic parts, plastic parts produced quantity particularly large, want to save test time and test costs.

3) the production of raw materials in Injection molded plastic parts, there are a lot of raw material is powdered, granular or liquid form, the raw material for these multi-use sampling. Compared with the full inspection sampling inspection, although there are a small number of test and low test cost advantages, but also the following problems: First, when the second installment of the plastic parts, even after sample testing has been considered qualified, can not believe that this batch of plastic parts plant each plastic parts are qualified, which may also exist a very small amount of non-conforming product. Second, the sample tests will inevitably appear judgmental errors, this is the vast majority of qualified products, due to sampling bias, but judged unqualified; or could have been substandard goods, has become qualified. Therefore, in order to determine the probability of error is controlled within a reasonable range, often need to coordinate the use of mathematical statistics methods.

In short, the full inspection and sampling test has its own characteristics, and applications and problems also vary, depending on the circumstances test methods should be chosen to adapt. Mostly due to the injection mold products for mass production, it is more to take sample tests

Advantages of plastic medical devices

Advantages of plastic medical devices

Use plastic equipment called a major initiative of the medical profession. From drug and pharmaceutical packaging products, to syringes, tubes, surgical instruments and other disposable medical equipment can be seen in the presence of plastic instruments.
Disposable medical device market demand potential is so great why, largely because of its advantage following aspects:
1, light weight, and effort, help reduce fatigue caused by surgery doctor for a long time. More suitable for human blood and muscle tissue, so the more effective.
2, tough is good, anti-permeable, durable, plastic parts can also be used normally at high temperatures.
3, transparent, medical procedures can be better observed, especially during surgery.
4, easy to shape, suitable for the production of a variety of shapes, complex medical equipment and supplies, and simply use the low-cost production process. Use disinfectant or sterilizing temperature corrosion does not occur, or color change phenomenon.
5, compared to metals and other raw materials, low cost, suitable for the production of disposable consumables, and after sterilization of packaging materials used to help reduce the risk of infection.
6, as compared with ceramic or the like brittle glass material, a more secure, especially as packaging material.
With the increase of the proportion of population growth and an aging population, the demand for plastic medical equipment continued to expand, particularly into the body of the equipment. The use of medical equipment to diversify from a single, volume size is shrinking, now one can replace equipment more than the previous equipment. Because many outstanding advantages of plastic medical equipment, pharmaceutical industry in the future course of development, its market share and influence will grow.

Precision Injection Mold Manufacturer Industry Development In China

In China,Precision injection mold industry development is getting better and better

injection mold manufacturer in china

injection mold manufacturer in china


Many industry rising to the requirement of the mould, so precision injection mold manufacturer industry development gradually hot up, with the vigorous development of the electronic information industry and traditional industry informatization modification, plastic mold market prospect of a vast, global high-grade, china precision plastic injection mold manufacturer market is in short supply situation.

In recent years, China plastic injection mold manufacturing level has been improved greatly, the production of large single set weight of the plastic mould has reached more than 50 t, the accuracy of precision plastic injection mold making has reached to 3 cm, already can produce a multi-cavity mold, plastic mold cavity encapsulation molds, 7800 high-speed molding aspect has been able to produce extrusion speed of more than 4 m/min high-speed plastic different profile extrusion mold and the main profile double co-extrusion mold cavity.

Affected by the variety of national policy and the continuous expansion of market space, car industry, IT industry, packaging industry momentum very rapidly in recent years, not only has made great development in terms of capacity, but also in the aspect of the industry’s high-end has a great progress, therefore, in the industry including the three aspects has a strong injection mold manufacturing needs. Part of automobiles, IT products of plastic parts need to be all through the molding, eventually to become a finished product for sale.

With the rapid development of plastic industry and general engineering plastics in such aspects as strength unceasing enhancement, the application range of the plastic products are also constantly expanding, the amount of plastic products is also rising.

Automotive industry drive china injection mold manufacturing

injection mold manufacturer

injection mold manufacturer

Automotive industry drive china injection mold manufacturing

Auto injection mold is still the most widely manufacturing in china, the field of industry development is rapid, every new car invest need thousands of pair of injection molds, auto makers has formed with the closely matching mould enterprise development, research and debugging technology, production of strategic alliance. Cars are increasingly high strength plate in order to reduce weight, also for some ultra high strength plate hot forming and the corresponding hot forming mould has naturally become the development trend.

Automotive Injection Molds to use plastic lighter will increase and the development of new materials, including all kinds of new plastic, modified plastic, metal, plastic, magnesium alloy, composite material, and so on, this requires a new forming technology, which also requires that have adapted to the new mold. According to network mold, China injection molds in the future in the market, the proportion of total plastic mold in the china will gradually increase, its development speed will be higher than other mold manufacturer.

“Injection mold to elegant, requires good appearance generous, internal defects, this would require careful, precision injection mold with high quality. At present, the refinement has a big gap, refinement is often ignored by some companies, the results fell short.” Company, I think that the injection mold fast and efficient production, the injection molding enterprises try to shorten the mold production cycle time, to plastic molding the user mould as soon as possible, on the other hand is more important, the user can you provide a injection mold to production products more quickly and efficiently. Such as more than a multi-cavity mould production, laminated mold, forming time and make good use of hot runner technology to shorten the use of multilayer composite technology, mould decoration technology, highlights non-mark injection molding technology, testing technology and process of composite technology and transfer technology and so on, at the same time stamping forming process intelligent also requires intelligent mold to adapt.

Precision injection molding in China

Precision injection molding and the common plastic molding difference

The characteristics of precision injection molding is: the size of the injection molded parts with high precision, small tolerance.

precision injection molding

precision injection molding

To achieve the requirements of precision injection conditions must be met:

(1) the mold material is better, rigid, cavity dimension precision and template between positioning accuracy is higher, lower surface roughness.

(2) to adopt precision plastic molding machine.

(3) to adopt precision molding process.

4) to choose suitable for precision injection molding process of the material. Commonly used precision molding materials have several: POM, POM = CF (carbon fiber), PNM = GF (glass fiber), PA \ FRPA66 (enhanced PA), PC, etc.

Precision injection process can ensure the size precision injection molding is the important way to control the shrinkage of injection molded parts, including: thermal contraction, disguised contraction of molded parts, orientation and compressed contraction and elastic recovery.

Common injection molding features are: precision is not high, the size of injection molded parts are typically can be assembled into standard, requirements for the appearance of the injection molded parts is relatively high, if necessary, may use the second processing (oil, for example) to improve the appearance of defects. Ordinary injection molding don’t need to use special precision injection molding machine, also do not need to specially designated materials, general common thermoplastics can be used to production. So ordinary injection molding technology is widely used in modern plastic industry.

Introduction to 3D printing technology

3D printing, i.e. a rapid prototyping technique, which is a digital document based on the model, the use of powdered metal or plastic materials may be bonded by way of the printed layer by layer technology to construct the object.
3D printing materials are usually printers using digital technology to achieve. Often in the mold manufacturing, industrial design and other fields are used to make the model, and then gradually for direct manufacturing of some products, there have been made using this technique to print parts. The technology in the jewelry, footwear, industrial design, architecture, engineering and construction (AEC), automotive, aerospace, dental and medical industries, education, GIS, civil engineering, guns, and other fields have applied.

Everyday life of ordinary printer can print flat items used computer design, and the so-called ordinary printers and 3D printer works basically the same, but somewhat different printing materials, printing materials are ordinary printer ink and paper, while the 3D printer built with metal , ceramic, plastic, sand and other different “printed materials”, are real materials, the printer connected to the computer through computer control can be “printed material” layer laminated together, eventually became the blueprint on your computer kind. In layman’s terms, 3D printer can “print” of a 3D object in real devices, such as printing a robot toy car printing, printing of various models, and even food, etc.. The reason colloquially called “printer” is a reference to the technical principles of ordinary printer, because the process of layering and ink-jet printing process is very similar. The three-dimensional printing technology called 3D printing technology. [2]
There are many different 3D printing techniques. They differ in the way that the material is available, and to create build parts with different layers. [6] 3D printing materials are commonly used in fiberglass nylon, durable nylon material, gypsum materials, aluminum, titanium, stainless steel, silver, gold, rubber-like material.

type Technologic Raw material
press 熔融沉积式 (FDM) Plastics molding
string 电子束自由成形制造(EBF) Any alloy
coins 直接金属激光烧结(DMLS) Any alloy
电子束熔化成型(EBM) Titanium alloy
选择性激光熔化成型(SLM) Titanium alloy,Cobalt chromium alloy, stainless steel, aluminum
选择性热烧结(SHS) Plastics molding
选择性激光烧结(SLS Plastics molding
powder spray 3D printing 石膏3D打印 (PP) Gypsum
Layer press 分层实体制造(LOM) Paper, plastic film, metal film
Photopolymerization 立体平板印刷(SLA Photocurable resin
数字光处理 (DLP) Photocurable resin

3D printing technology is not used in mass production, so some experts advocate 3D printing is the third industrial revolution, this argument is just agimmick.Foxconn OEM for Apple iPhonehas been for many years.Gou made​​ with 3D printing phones to illustrate 3D printing products can not only see, because we can not add electronic components, electronic productscan not be produced as the amount of these products.3D printing even without the production of electronic products,but by material constraints,other products can be produced very little, “even if the products produced, can not mass production, but also on the brokenYishuai.
“3D printingis indeed more suitable for some small-scale manufacturing,especially high-end customized products, such asauto parts manufacturing, although the main material is plastic, but the future of metallic materia ls will certainly be applied to 3D printing in the past,” said Crump, 3D printing technology has entered thedental, jewelry, medical industry,the scope of future applications will be more widely available.

3d printing gun
3d printing + injection molding in china

China quality molds and products supplier selection

Aston Martin complain china plastic injection molding company

Aston Martin complain china plastic injection molding company

 Luxury sports car maker Aston Martin has announced a global recall

Aston Martin ignore its internal processes for a range of procurement, vendor and product monitoring problems,since November 2007 produced a total of 17,590 sports car, called the discovery of parts of China for the production of sub-suppliers in Shenzhen KEXIANG mold companies(Shenzhen KeXiang Mould Tool Co Limited) use fake plastic material. In this regard, caught in storm in Shenzhen KEXIANG mold company responsible Ang Zhang announced that denies its production Aston Martin • Over parts. China has a lot of plastic injection molds and products manufacturer, they serve different target customers, some companies large scale, but the basic outsourcing, in fact, customers need to find is a real experience, and provide long-term senior custom mold for overseas customers and plastic products suppliers, CN-MOULDING no doubt that customers really need to find manufacturers.Since its establishment in 1997, the years from different companies for their commitment to providing quality automotive parts, medical equipment, industrial supplies, electronic components, small appliances mold design and manufacture of lastic products processing factories. The company currently employs 80 people,The significance of the quality of the enterprise:

Quality control for plastic injection molding in china

Parts made in a plastic injection molding process can have their own unique set of possible defects. That is why all of our employees are trained to spot these problems. The following is a listing of the most common defects associated with the plastic injection molding and transfer/compression molding processes:

Sink Marks: Sinking is caused by the outer skin of plastic solidifying while the material inside is still molten and viscous. As it cools and solidifies, the material compacts . The best way to avoid these dimples is to design the part with a consistent wall thickness. However, many times the effect of the sink mark can be minimized by adjusting molding parameters such as injection pressure and time.

Gas marks (burning): When molten plastic is injected into a mold cavity, the air that is in that cavity needs a place to escape. If the hot compressed air cannot escape, it may leave burn mark on the part. The best way to avoid gas marks is to strategically locate air vents of the proper depth within the mold. Adjustments to process parameters such as injection speed and screw speed can be altered to reduce or eliminate burning.

Custom plastic injection molding in china—-RIM technology

Custom plastic injection molding in china

Custom plastic injection molding in china

Custom Plastic Injection Molding in china for RIM

RIM (reaction injection molding), Chinese commonly known as reaction injection molding , is the late 1970s, first developed in Europe and America . Is different from the traditional injection molding and other molding process is a special process .
The principle is:
The two reaction materials ( polyurethane component and resin mixture ) with a stirrer were placed in a temperature-controlled feed tank , through accurate measurement , at high pressure into the mixing head at the start of injection , the mixing head of the valve to open , the reactants into the mixing chamber under pressure , speed fierce collision , near the atmospheric pressure and then flows into the mold , the exothermic chemical reaction in the mold to form a polyurethane polymer . This process can be simplified to : Store → Measurement → mixing → ​​filling → ​​curing → top out → post-processing.
RIM molding process is particularly suitable for large-scale ( large ) housing member .

PU resin first by Bayer (Bayer) (PU industry founder ) , Professor invented in 1937 , has been 70 years old .
Polyurethane with high strength, abrasion resistance , tear resistance, flex resistance, low temperature resistance and oil resistance, excellent chemical resistance and good blood compatibility , etc. , etc. . Polyurethane foam products made ​​of resin , elastomers, coatings, adhesives , fibers, synthetic leather and other varieties of auxiliary surface material , which is widely used in transportation, electronics, shipbuilding , civil engineering , light industry and textile and other sectors , products and varieties yearly basis, in the material industry occupies important proportion of the current usage of the PU after PP, ABS, PVC. since the late 1930s since the advent of its applications continue to expand , production increased year by year , is developing very rapidly .
RIM process has the advantage ( own summary , we hope to supplement ) :
1 , shorten product development cycles , reduce product development costs
RIM technology to make product design becomes more free, more casual , and its expression on the product to better reflect the designer’s whim , and because of the low viscosity of the reaction material , good fluidity , can be very small in the case of pressure under molding complex parts ; due process of low pressure injection of RIM , low requirements of the mold , the mold is usually done using epoxy or aluminum material , so the cost is only a fraction of the equivalent injection mold , the processing cycle more is the injection mold can not match, the process is particularly suitable for short production and prototype production, can greatly shorten the product development cycle and saving development costs and speed to market share opportunities ;
2, can be molded article of a large area of good quality and the appearance and structure of the

Custom plastic injection molding in cina process of RIM

RIM molding process of product size and stability , aesthetically pleasing ( up to Class A surfaces ) , impact resistance and good corrosion resistance ( up to PC / ABS performance ) , for forming a larger area of ​​housing has unparalleled advantages, RIM product thickness range is very large, the same cross-section of molded parts can vary between from 6mm to 28mm , which is the other process can not be compared , it can be integrally molded article thickness variations in order to improve the quality of products reliability , good performance surface coating , which can meet different process requirements , formulated by adjusting the ratio of raw materials can be made into a hard surface such as density polyurethane foam structures of different products to meet the diverse needs of customers ;
3 , the product package inserts simple process
A variety of inserts can be placed in the injection mold before the RIM material , so that the RIM material in the molding process to complete the package insert , steel or aluminum structural frame , electronic sensors , circuit boards, batteries, antennas, magnets, glass, metal parts so you can use RIM technology package, thereby reducing or even eliminating secondary processing sectors , so you can : Protect your important and sensitive components from dust, oil , corrosive chemicals pollution ; make your product You can work in wet or even water ; increased intensity of your product and protect critical components from impact damage from impact or slow ; way so your products can be in more extreme environments.
4 , easy to mold paint spraying
In the RIM process, prior to injection can be coated with polyurethane paint and gelcoat in the mold . Gelcoat or polyurethane paint in the molding process and polyurethane materials combined into one, resulting in mold decoration finished parts , greatly reducing the cost and increasing the secondary painting after processing efficiency.
RIM technology because of its superior product performance are widely used in automotive parts and modification parts, engineering machinery covering parts , medical equipment , instrumentation , electronics, machinery and equipment covering parts , industrial parts , chemical components , sports and other fields, as alternative materials such as metal , has incomparable advantages and prospects .

want to know more for custom injection molding in china or custom plastic injection molding in china, visit our website or http://www.youtube.com/watch?v=XkftBb5lYgc

with video

Reference page at : http://www.plastic-injectionmoulding.com/tag/china%20custom%20injection%20mold.html