Application of TPE in compound injection molding t

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Application of TPE in duplex injection molding technology

duplex injection molding technology was used to beautify the appearance of consumer goods at the beginning, and is now very popular. This technology is used in various applications and can even be used to enhance product functionality, such as improved chemical resistance, enhanced grip, softer and more attractive feel

duplex injection molding technology

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

whether injection molding of inserts or secondary injection molding is used, thermoplastic elastomer (TPE) is injected on a compatible rigid substrate. This enhances the functionality of the "soft coated" product, 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 the 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. The special machine used in this case 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 the processing temperature are important factors affecting the bond strength

◆ material compatibility: bonding 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 bonding strength

arnitel application 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, and improves processing, productivity and chemical resistance

most soft touch duplex injection 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 fluidity. 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 well bonded to polar polymers (such as PC, pc/abs, ABS) used as rigid substrates through multiple 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 performance, combined with the excellent processing performance of arnitel TPE in duplex injection molding, provide an ideal solution for LOGICOM's controller design

miss linliyun, sales coordinator of LOGICOM company in Singapore, said: "in duplex injection molding, the excellent bonding between arnitel TPE and ABS substrate in vehicle VOC test method and improvement scheme (wangsufang, technical manager of Shanghai Boni Test Technology Co., Ltd.) Sex was an important factor in the selection of arnitel TPE. Our production manager found arnitel TPE very easy to process. 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. It has 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. It is 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. DSM provides LOGICOM with the processing conditions to achieve the best adhesion with ABS through years of extensive research and quantification in practice, which ensures that LOGICOM has obtained the best solution

◆ use of physical bonding or adhesive: when the arnitel TPE is injected with a non-polar polymer (such as PP) or PA, the mechanical interlocking design is often used to improve the bonding 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 rarely 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 functions 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 handle material for kitchenware. The scheme of secondary injection molding with arnitel can integrate different functions on the same part, which brings more free design space to Tupperware

in addition, arnitel has excellent scratch resistance. Even after five years of continuous use, the kitchen utensils still look beautiful. In addition to these advantages, arnitel can beat its competitors because:

◆ arnitel can be cleaned with a dishwasher

◆ arnitel is the only material approved for direct contact with food

◆ Zhong Huaining put forward four suggestions during the secondary injection molding process: "1. 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. To ensure that the upstream transmits the declaration of conformity and supporting documents to the downstream; 3. To ensure that the finished products meet the normative requirements of product standards and framework standards; 4. To ensure that the production meets the requirements of GB 31603 good production hygiene code, arnitel's low viscosity product specification provides a very excellent Liquidity

DSM (China) Co., Ltd.

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