How to choose reaction injection molding(RIM) manufacturer in China.

What is reaction injection molding?

Reaction Injection Molding (RIM), also known as low-pressure reaction injection molding,is a new manufacturing process applied to rapid molds.RIM mainly mixes two-component polyurethane materials and injects them into rapid molds at normal temperature and low pressure. Chemical and physical processes such as polymerization,cross-linking,and curing form products. It has the advantages of high efficiency, short production cycle and low cost. It is suitable for small batch trial production in the product development process, as well as the production of small batch production of covering parts with relatively simple structures and large thick-walled and uneven-walled products.

How reaction injection molding work?

The RIM process is as follows:the monomer or prepolymer enters the mixing head in a certain ratio through a metering pump in a liquid state for mixing.After the mixture is injected into the mold, it reacts quickly and cross-links and solidifies in the mold,and the RIM product is formed after demoulding. This process can be simplified as: storage → metering → mixing → filling → curing → demoulding → post-processing.

The advantages of reaction injection molding.

1. High efficiency,short production cycle, simple process and low cost,and can be made into parts with different densities,hardness and elasticity.
2. Compared with the vacuum casting or injection molding process, the size of the formed product is larger,suitable for forming products with large wall thickness and no sink marks on the surface.
3. The molded product has a good packaging effect,which can meet the purposes of appearance design verification, structural testing, etc.
4. Compared with the traditional mold technology and process, the cost and cycle are greatly reduced.

How to choose reaction injection molding(RIM) manufacturer in China.

It is not easy to choose a strong RIM manufacturer in China.If customers cannot identify,they can consider using the number of devices as a rigid indicator.Because this not only affects the delivery date, but also the standard for identifying small workshops. Generally speaking, small workshops only have two or three pieces of equipment, and the delivery time is often affected due to the low machine configuration and batch processing.Too many quantities need to be outsourced to affect the quality.At Jevny(www.jevny.com),we have enough RIM equipments to support your project.Why choose us:

1.More than 16 years in RIM manufacturing in China,focus on all kinds of large size parts.
2.Various surface treatment services support your project.
3.Full set of testing equipments to make sure all high quality parts before shipment.

Any RFQ for RIM parts,drop mail to freequote@jevny.com,we would like to reply and quote within 2 hours.

Vacuum Casting VS Reaction Injection Moulding(RIM) for low volume production in China.

Vacuum Casting VS Reaction Injection Moulding(RIM) for low volume production in China.

Vacuum Casting and Reaction Injection Moulding are common manufacturing way for low volume production. The both of making way look similar.Make an master mold by CNC processing or 3D printing.For those with complex structures, make an master model by 3D printing, and then use the master mold to make a silicone mold. Then use the silicone mold to make a batch copy. However, there are some differences between the two methods,Next,we will analyze the difference between the vacuum casting and Reaction Injection Moulding.

1.Vacuum Casting

Vacuum Casting(urethane casting) is a common processing method that uses the master mold to make a slicone mold in vacuum state,and uses PU material to pour in vacuum state, so as to clone the same copy as the original template.It is mainly used for small batch customization of plastic tablets.Generally, dozens to hundreds of plastic tablets are processed in this way,which is cost-effective.

The material performance of vacuum casting products can simulate the performance of most existing engineering materials. Common materials include domestic PU, imported PU, transparent PU, soft PU, POM, ABS, PP, PC high temperature resistant ABS, etc. At the same time, transparent parts such as PC, organic glass, thermoplastic elastomer TPR, TPR, TPU, and various soft materials such as silica gel, rubber, etc. can be copied. At the same time, various colors can be added to the copied products to meet various appearance requirements.Product replication is not affected by volume, complexity, various structures, etc. It is easy to open the mold, short cycle, and quick to take effect.

2.Reaction Injection Moulding (RIM)

RIM,also known as low pressure reaction injection molding, is a new process applied to rapid tooling. It is mainly used to mix two-component polyurethane materials and inject them into rapid tooling under normal temperature and low pressure.Products are formed through chemical and physical processes such as polymerization, cross-linking and curing of materials. The utility model has the advantages of high efficiency, short production cycle and low cost. It is applicable to small batch trial production in the process of product development, as well as the production of small batch panels with simple structure and large thick wall and uneven wall thickness products.

The first to use Reaction Injection Moulding in China is applicable to the automobile industry.In recent years,the domestic medical product manufacturing and instrument manufacturing use relatively more reaction injection moulding technology.Because the number of instruments and medical products produced is not large, the annual sales of a product is tens of hundreds of sets, If the injection cost of steel mold is relatively high, and there are many medical products, the wall thickness is relatively thick, or the wall thickness is uneven, which is not suitable for the injection molding process, the surface surface is complex, and it is not suitable for the blistering process, but the low pressure injection is different.Thick wall products can be poured, and the wall thickness can be uneven products.The normal pouring wall thickness (5-6mm) can be about 30mm at most, There are many materials used for molds (including aluminum mold, resin mold, plastic mold, gypsum mold, etc.). There are many injection materials, including imported materials, domestic materials, materials close to ABS, and materials close to pp.

Summary of differences: vacuum casting is mainly used to copy small prototype in small batches (such as ABS, PC, acrylic prototype, etc.), while Reaction Injection Moulding(RIM) way is used to copy large prototypes, such as car bumpers, medical instrument case shells, instrument panel handboards, etc.

Reaction injection moulding(RIM) for low volume production in China.

Reaction injection moulding(RIM) for low volume production in China

Reaction injection molding (RIM) is similar to injection molding except thermosetting polymers are used, which requires a curing reaction to occur within the mold.Reaction injection molding can produce strong, flexible, lightweight parts which can easily be painted. It also has the advantage of quick cycle times compared to typical vacuum cast materials. The bi-component mixture injected into the mold has a much lower viscosity than molten thermoplastic polymers, therefore large, light-weight, and thin-walled items can be successfully RIM processed. This thinner mixture also requires less clamping forces, which leads to smaller equipment and ultimately lower capital expenditures. Another advantage of RIM processed foam is that a high-density skin is formed with a low-density core.

Common items made via RIM include automotive bumpers, air spoilers,fenders.and some big medical devices.So if you need low volume porduction manufaturing in China for auto parts like bumpers, air spoilers,fenders,suggest make them by Reaction injection moulding(RIM) in China.Surely,if you need small production for some medical devices or medical equipments in China,also you could consider make them by Reaction injection moulding(RIM) way.

Anyway,need Reaction injection molding (RIM)manufacturing in China,send RFQ to freequote@jevny.com.Jevny Technology Co.,Ltd is one professional China Reaction injection molding (RIM) manufacturer.