Application of TPE in compound injection molding t

Application of TPE in duplex injection molding technology

duplex injection molding technology was first used to beautify the appearance of consumer goods, and now it is very popular. This technology is used in various applications, and can even be used to enhance the functionality of products, such as improving chemical resistance, enhancing grip, softer hand feel and more attractive

duplex injection molding technology

the commonly used material in duplex injection molding is thermoplastic elastomer (TPE). The variety of materials that can be used for duplex injection molding has greatly increased. For multiple injection molding on substrates (such as ABS, PC, pc/abs, PA and San), commonly used TPEs include SEBS, tpe-v, tpe-u, TPE-E and tpe-a

whether it is injection molding with inserts or secondary injection molding, thermoplastic elastomer (TPE) is injected on a compatible rigid substrate. This enhances the functionality of the "soft wrapped and hard covered" products, such as insulation, chemical resistance, more ergonomic, better hand feel, grip and outstanding beauty

◆ insert molding: in insert molding, first make rigid parts (usually hard plastic parts), insert them into the mold cavity, and then use TPE injection molding on this component, and finally get a complete product. The injection molding equipment can be used for insert molding. The placement of rigid parts can be completed by manual or mechanical arm

◆ secondary injection molding: secondary injection molding is also called double injection molding, two-color molding or multi-material molding. In this case, the special machine used has multiple barrels, which are used to inject different materials into the same mold

adhesion in duplex injection molding

in duplex injection molding, the adhesion between hard substrate and TPE is the key to the success of processing. Poor adhesion can lead to problems such as peeling, curling, wear or delamination. The compatibility between the two materials and processing temperature are important factors affecting the bond strength

◆ material compatibility: bond strength of different hard/soft material combinations

◆ processing temperature: the following figure is an example of arnitel TPE-E compound injection molding on PC substrate, which reflects the relationship between TPE melting temperature, rigid substrate temperature and bond strength

Application of arnitel in duplex injection molding

arnitel is a thermoplastic elastomer (TPE-E or cope) based on polyester, which is produced by DSM engineering plastics. This kind of polyester elastomer combines the strength, processing characteristics and thermosetting elastomer properties of engineering plastics, improving processing, productivity and chemical resistance

most soft touch duplex injection molding applications involve injecting a thin layer of soft material (TPE) onto a hard substrate. Because TPE usually needs to flow through long paths and thin-walled areas to fill the mold, TPE must have high liquidity. Arnitel's low viscosity product specification optimizes the adhesion that is critical for duplex injection molding and is the preferred material for this processing application

◆ chemical bonding: arnitel TPE is bonded very well with polar polymers (such as PC, pc/abs, ABS) used as rigid substrates through double injection molding. Due to this excellent adhesion, arnitel will not be layered with the substrate even under very high torque

logicom, a company that produces high-end wireless remote controllers for game consoles, has been looking for a design scheme that can make the game controller beautiful and meet the requirements of ergonomics. The designer adopted the scheme of double injection molding of elastomer on ABS substrate to achieve this dual requirement: soft handle and good grip. This scheme has been widely used in the field of game products

in the process of selecting surface elastomers, they evaluated various TPEs and finally chose arnitel TPE. Excellent structural characteristics and excellent surface sensory properties, combined with the excellent processing performance of arnitel TPE in duplex injection molding, provide an ideal solution for LOGICOM's controller design

Singapore logijjg1136 (2) 017 added an experimental machine in the measurement characteristics table 2, in which the relative error of the cycle torque range and the relative error of the cycle torque peak are better than 1%. Miss Lin Liyun, the sales coordinator of COM company, said: "in duplex injection molding, the excellent bonding between arnitel TPE and ABS substrate in vehicle VOC test method and improvement scheme discussion (Wang Sufang, technical manager of Shanghai Boni Test Technology Co., Ltd.) Sex is an important factor in the selection of arnitel TPE. Our production manager found arnitel TPE processing very easy. During the processing of arnitel TPE, we have not encountered the common problems of sticking mold and burring when evaluating other TPE materials. "

dsm is not a simple raw material supplier. They have set up a special expert group to study various applications in different countries, provide application solutions, improve processing technology, and enable customers to invest more time and energy in development, but a provider of value-added solutions

dsm has decades of experience and knowledge in compound injection molding of arnitel TPE and various polymers. Arnitel TPE has excellent adhesion with polar polymers such as ABS and polycarbonate. The processing conditions provided by DSM for LOGICOM to achieve the best adhesion with ABS are obtained through years of extensive research and quantification in practice, which ensures that LOGICOM has obtained the best solution

◆ use of physical connection or binder: when the compound injection molding is carried out between arnitel TPE and non-polar polymer (such as PP) or PA, the mechanical interlocking design is often used to improve the connection force with the substrate (Fig. 3). In addition, adhesive or primer can be used to improve the adhesion between flexible arnitel and non-polar polymer. Generally, the adhesive based on polyurethane has a good effect. Adhesives based on acrylic resin and epoxy resin can also be used, but these adhesives have been less used

◆ comfortable touch: Tupperware, a famous brand of household products and kitchenware products, is well known for its novelty, high quality (lifetime warranty) and beauty

a typical example is the soft grip series kitchenware recently introduced to the market. The combination of flexible and rigid plastics makes these products feel comfortable. The luxurious appearance and comfortable handle make its function perfect, and the excellent holding effect ensures the safety of use

because arnitel and PBT have excellent adhesion in secondary injection molding, Tupperware prefers arnitel as a soft touch kitchen handle material. Using arnitel for secondary injection molding can integrate different functions on the same part, which brings more free design space to Tupperware

in addition, arnitel has excellent scratch resistance, and even after five years of continuous use, the appearance of kitchenware is still very beautiful. In addition to these advantages, arnitel can beat its competitors because:

◆ arnitel can be cleaned with a dishwasher

◆ arnitel is the only approved material that can directly contact food

◆ in the process of secondary injection molding, Zhong Huaining put forward four suggestions: "1. It is necessary to ensure that upstream suppliers use relevant standards or chemical materials and raw materials approved by the health and Family Planning Commission to produce materials and products; 2. It is necessary to ensure that the upstream transmits the declaration of conformity and supporting documents to the downstream; 3. It is necessary to ensure that the finished products meet the normative requirements of product standards and framework standards; 4. The production should meet the requirements of GB 31603 good manufacturing hygiene code. Arnitel's low viscosity product specification provides a very excellent Liquidity

DSM (China) Co., Ltd.

address: 10a, No. 25, Chongqing Middle Road, Shanghai

postal code: 200020

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