Commonly injection mold material

 

Injection Mold China Material Reference

Plastic Die steel module (cavities, slider, inclined top, inserts, etc.) :

No any requirement of mould, the cheapest or with few: 45 # (C1045 CK40 S45C his standard), 50 # (C1045 CK53 S50C jis standard)

General requirements: the pre-hardened plastic Die steel P20 (P20 1.2311 din 618 Swedish 3 cr2mo GB)

High demand mould: 718 super pre hard plastic Die steel (P20 + Ni 1.2738 din 718 Swedish cr2nimo 3 GB)

More demanding mould: 738 cr2nimn mo (4 GB) mold to be polished into a bright luster: NAK80 ni3 (P21H NAK80 Japanese standard 12 GB) mirror plastic die steel corrosion resistant plastic mold: use type plastic injection molding has corrosive gas corrosion of steel is used when: M300 corrosion resistant steel (Austria) 3 cr17mo (GB), need to be polished mirror to use

S136H corrosion resistant mirror steel (420, 1.2083, 3 cr13 GB standard S136H Sweden)

Die set:

The general minimum requirements: 45 # (C1045 CK40 S45C jis standard)

Commonly used: 50 # (C1045 CK53 S50C jis standard)

Ordinary requires large formwork: 55 # (C1045 CK56 S55C jis standard GB)

High demand, large formwork: GS638 (P20 GS638 42 CrMo jis standard GB)

Chinese injection mold and mold making Accessories:

Guide pillar: 20 # (S20C) or 20 mn2b (SMn420), treatment: carburizing and quenching, processing hardness greater than or equal to 55 HRC T8A, T10A, treatment: surface quenching, processing hardness is less than or equal to 45 # 55 HRC processing: tempering, surface quenching, and low-temperature tempering, hardness is greater than or equal to 55 HRC after processing

Guide bush:

H62 brass or bronze

Bush: 45 #, 50 #,  55# treatment: surface quenching, hardness is greater than or equal to 55 HRC

Pushrod, thimble, pull rods, such as T8, T8A, T10, T10A processing: quenching and low-temperature tempering, the hardness is greater than or equal to 55 HRC

45 #, 50 #,  55# processing: quenching, hardness is greater than or equal to 45 HRC

All kinds of plate material: 45 #, 50 #, 40 cr (conditioning), structural steel Q235 ~ Q275, the large plate can be used in injection mold china material selection: ductile iron

Overmolding company service in china

 

In China, overmolding service is one kind of customer plastic injection molding type

Overmolding is a kind of special and universal precision plastic injection molding process, a kind of soft material is formed on another kind of hard material. Why this process is special because if you can not choose the right material, it is difficult to combine the two materials in chemical and Mechanical.

No long working experience, and the injection mold making team, can not guarantee the production of life into a finished product Many new arrivals China mold manufacturer beginning despises the result is, mold development failure, serious consequences of the customer project period, then the loss of customers. Why said that the general, injection molding cheaper than comparable manufacturing, of course, become the first choice of many product designers.

Do this kind of mold to pay attention to the following items, the project development early material selection is very important: these two kinds of plastic need not be the same but must be compatible For example, if you find that the second material will melt or distort the first material during the trial, it is certain that your material selection is wrong.

We have mastered the high-performance overmolding technology, including the following:

Cnmoulding development of overmolded products by combining the unique properties of our rubber-like plastic Polylastomer? components with our many years of experience producing insert molded products. One of our first over-molded products was developed for a leading medical manufacturer. Today we have manufactured a lot of overmolded parts. Many of our customers produce consumer-oriented products.Cnmoulding Plastics’ overmolding technology adds value to their products and adds consumer appeal.

In pioneering the process, we have worked closely with resin manufacturers to develop materials that bond in the overmolding process. Many products use Polypropylene as the substrate to bond with TPE, TPR, SILICON Rubber-type materials. Today there are elastomeric materials that will bond to Nylon and ABS substrates, as well. This gives designers more options in developing overmolded parts.

Our overmolding technology allows designers and engineers to create a strong structural product with excellent ergonomic comfort for the end-user. Overmolded parts can add further appeal by being molded in two different colors.

We would like to share our overmolding experience with you. Contact us with your needs. We will promptly help you develop high-quality, economical, successful overmolded components that will assist you in selling your product.

overmolding for 2 color product with 2 kinds of material (hard and soft material) in one product

• Regularly scheduled tool maintenance.
• Use of logically balanced runners.
• Use of quick mold change systems.
• Mold design practices that allow for future flexibility in production.
• Face-mounted inserts for a quick change.

 

Refrigerator drawer mould

The picture file is the refrigerator drawer injection mold, which uses a single-mouth open hot runner to feed the product directly. The front mold is left in its original form, and the back mold is inlaid with mold cores. The big row on one side meets the big inclined roof, and the small row on both sides is structured. Cooling water is passed through both the row position and the inclined roof, and the top block is used for ejection.

Features

1. One-point needle valve in the hot runner, with beautiful breakpoints;
2. GPPS is transparent, highly non-toxic, fully automatic production, no bubbles, no cracks in appearance;
3. Food-grade non-toxic materials, environmental protection, no cracks;

Refrigerator drawer molds generally use PP or PC, which have better permeability and higher product surface requirements, which are high-gloss molds. So how to make this refrigerator drawer mold?

The high-gloss mold is controlled by the mold temperature machine to control the mold temperature, and the hot runner, solenoid valve, and time relay control the time-sharing glue feeding, so as to produce high-end products with a bright appearance, no shrinkage, no welding marks, and other defects.

High-gloss molds generally have the following characteristics:

1. The molding temperature is relatively high (usually around 80-90 degrees)
   Pressure-holding molding at a higher mold temperature is beneficial to eliminate defects such as weld marks, flow marks, and product internal stress. Therefore, the mold needs to be heated during work. In order to prevent heat loss, a resin insulation board is usually added to the fixed mold side.
2. The surface of the cavity is extremely bright (generally mirror level 2 or higher)
   The products produced by the high-gloss mold can be directly used for installation without any surface treatment. Therefore, it has high requirements for mold steel and plastic materials.
3. The hot runner system has more hot nozzles (usually 6-8 nozzles, sometimes more)
   Each hot nozzle must be equipped with a sealing needle and an independent air passage, which is individually controlled by solenoid valves and time relays to realize time-sharing glue feeding, so as to achieve the purpose of controlling or even eliminating weld marks.

Key Points of Refrigerator Drawer Mould Design

1, Refrigerator drawer mold requirements for product structure

Refrigerator drawer molds have strict requirements on product structure. As we all know, the brighter the product, the more sensitive it is to the effect of light refraction, and a slight defect on the surface will soon be found. Therefore, the first thing to solve is the shrinkage problem. According to empirical statistics, the thickness of the ribs of general products does not exceed 0.6 times the thickness of the main glue position, and it will not shrink, or the shrinkage is small and difficult to be found, so it can be ignored. But for refrigerator drawer molds, this requirement is far from enough. It is necessary to reduce the thickness of the product ribs to no more than 0.4 times the thickness of the main body glue. For the screw posts, special treatment must be done.

2, Hot runner system of refrigerator drawer mould

The hot runner system is very important for the refrigerator drawer mold. Whether or not a product without weld marks can be injected, the quality of the hot runner and the adjustment of the machine are the decisive factors. The characteristics of the refrigerator drawer mold runner system: the hot nozzle of the refrigerator drawer mold must have a sealing needle, and each hot nozzle must have an independent air channel (multiple air channels are not allowed to be connected in series), so that the solenoid valve can be passed And time relay to individually control the glue feeding time and amount of each hot nozzle, making necessary preparations for the injection molding machine.

3, Cooling and heating system of refrigerator drawer mould.

When the plastic material is injected into the mold cavity, within a reasonable temperature range, the higher the surface temperature of the mold cavity, the better the surface quality of the product, and the smaller the internal stress of the product. Therefore, in order to obtain a good product surface quality, it is a good way to increase the surface temperature of the cavity (however, increasing the mold temperature will reduce the injection efficiency, which requires comprehensive consideration). Generally, the refrigerator drawer mold is heated by a mold temperature machine during injection molding, so that the plastic is held in a high-temperature state in the mold, and the temperature is maintained, so as to eliminate defects such as flow marks and weld marks and achieve a mirror effect.

The water channel of the refrigerator drawer mold must not only be uniform but also must be sufficient, so that the required temperature can be easily reached by the mold temperature machine. At the same time, the use of an extended water pipe to directly transport the mold core without using a sealing ring can prevent the mold from working under high temperature for a long time, causing the sealing ring to age, and can also reduce the maintenance cost of many molds. It is worth mentioning that the water pipe of the refrigerator drawer mold must use a high-temperature-resistant oil pipe to prevent the water pipe from bursting under high temperature and high pressure.

How to improve productivity in injection molding

 

How to increase productivity in injection molding

 

If you have a plastic injection molding facility. You wanted to improve productivity and you had experienced people doing it. What projects would you choose and in what order? For example Shorter setup times, scrap reduction, injection mold preventative maintenance, optimum run size, etc.

Making wise and efficient use of your materials is another key tip for improving your injection molding process and the quality of your finished product. One thing to try is reducing the shot size. You're probably tempted to use the largest shot size your equipment will allow, but take a moment to re-evaluate.

 

Ways to improve

1) Allow specific injection molding machines to work on specific plastic parts. For this, you can concentrate on manpower and have specifically trained people for specific parts. EG. components for Apple products must be halogen-free. So machines cannot be used for other products that have halogen in them. And transparent plastic parts to be used on machines for transparent parts. So should also set aside machines for injection mold trials and machines for production.

 

2) Loading and unloading of injection molds can be time at 1 hour. This defers between big injection molds and small injection molds. How quickly this can be done really depends on the facilities and the setup team. If you are running long term productions. Setting up time may not be a big issue.

 

3) Scrap reduction should be monitored before an injection mold is commissioned for mass production. Improving injection molding productivity. In fact, after the injection mold trials were completed. The injection mold should go through a small batch production run of about 5k parts to be fully monitored. How the tooling is keeping up with the production and the amount of scrap it gathers. Basically, the amount of scrap during a mold trial should be kept below 20%. This includes purging the barrel. And attempts to fill the injection mold. For bigger molds, this may run differently.

 

Monitoring of production rates.

 

1). If your production is modulated by lots of employees and their rates, you have to monitor them. When we started paying incentive bonuses for increased rates beyond the minimum amount we felt we had to have to show a minimum return. The numbers went through the roof. When employees can get rewarded for their hard work in dollars, they will work much harder.

 

2). Mold maintenance technically should be done at different stages, simple maintenance, and comprehensive maintenance. Simple maintenance to be done within 1 or 2 months' time. This is to remove debris and clean up the injection mold. This should take a day or maybe have a day to do. Comprehensive maintenance should be done at least once a year. This is to check the injection mold for damages and perform necessary changes. The time allocated depends on how severe the injection mold wears. The timing can change based on the confidence you have with your injection molds. 

Why injection molds use hot runner?

 After years of development, injection molds have become one of the preferred molds for manufacturing in all walks of life around the world, especially in the developed countries of Europe and the United States, which have advanced in the industry. The most important thing to mention is the use of hot runner technology in injection molds.

hot runner

1， Hot runner technology shortens the injection molding cycle

Because there is no limitation of the cooling time of the main channel and the secondary flow channel, the injection mold can be ejected in time after being solidified. Many thin-walled product molding cycles produced with hot runner molds can be completed in less than 8 seconds.

2，Eliminating subsequent processes is conducive to production automation.

After the workpiece is formed by the hot runner mold, it is the finished product. There is no need to trim the gate and recycle the cold glue lane. Conducive to production automation. Many foreign manufacturers have combined hot runners with automation to significantly increase production efficiency.

3， Hot runner technology saves plastic raw materials

In the traditional mold injection, the nozzle material is produced. The high plastic product is not allowed to use the water material (recycled secondary material). Because the reuse of the nozzle material will degrade the structure and performance of the plastic part, the reuse will affect the product quality. There is no cold runner in the hot runner mold. So no nozzle material is produced (fees are required). This is especially significant for applications where the price of plastics is expensive. In fact, the major hot runner manufacturers in the world have experienced rapid development in the world. When oil and plastic raw materials are expensive. Because hot runner technology is reducing materials and reducing materials. Fees, an effective way to save costs.

4，Expand the application of the injection molding process

Many advanced plastic molding processes have been developed based on hot runner technology. Such as PET preforming, multi-color co-injection in the mold, a variety of materials co-injection process

5， Reduce the defective products of injection molds and improve product quality

During the hot runner mold forming process, the plastic melt temperature is accurately controlled in the runner system. The plastic can flow into the cavities in a more uniform state, resulting in a consistent quality plastic part. The hot runner molding plastic parts have good quality, low residual stress after demolding, small deformation of plastic parts. And greatly improved the surface appearance of injection mold products. Therefore, many high-quality products on the market are produced by hot runner molds. Many familiar plastic parts, such as telephone casings, mobile phone cases, printer cases, computers, and automobiles, are produced using hot runner molds.

Advantage analysis of Plastic Medical Devices

 The use of plastic medical devices can be called a major medical practice. From the pharmaceutical and pharmaceutical packaging to the needle, hose, surgical instruments and other disposable medical equipment can see the existence of plastic equipment.

Disposable medical device market demand potential is so great largely because of its advantage following aspects:

1, Lightweight, 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 a 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 of many outstanding advantages of plastic medical equipment, the pharmaceutical industry in the future course of development, its market share and influence will grow.