How to choose Fujian rubber TPE customization

TPE overmolding injection generally uses two-shot injection molding process,

Transparent grade includes transparent and translucent series, each with various softness; excellent transparency; smooth and soft surface; good yellowing resistance, tear resistance, tensile strength; environmentally friendly; suitable for various transparent series products.

To prevent contamination of TPE raw materials and the retention of old materials or impurities in the screw and attachments, especially for materials with poor thermal stability, it is necessary to clean all parts thoroughly with a screw cleaning agent before use and after shutdown to ensure no impurities adhere.

Rubber TPE customization

Fix the already molded (injected) hard plastic part onto the overmolding mold, then inject the TPE soft rubber onto the hard part at the appropriate temperature, and cool to obtain the product. The injection temperature for overmolding injection depends on the hard plastic material being overmolded.

TPE overmolding, as the name suggests, is to overmold TPE soft rubber material onto other materials.

Transparent TPE materials have different product properties in different applications. Thermoplastic elastomers are also called TPE materials. Transparent TPE not only has the processing properties of thermoplastic plastics but also the physical properties of vulcanized rubber, which is the advantageous combination of plastic and rubber. Transparent TPE is widely used in people's lives and production.

Due to the high light transmittance, TPE transparent materials require strict surface quality of the product, without any defects such as streaks, pores, whitening, haze, black spots, discoloration, poor gloss, etc. Therefore, throughout the injection molding process, strict and even special attention must be paid to TPE raw materials, equipment, molds, and even product design.

Rubber TPE customization

Commonly used processing methods include one-shot molding with a two-color injection molding machine, or using a general injection molding machine with an overmolding mold for two-shot injection molding. Products made by TPE overmolding are generally handles and handgrip types. TPE soft rubber material has a special comfortable touch, and the introduction of TPE material improves the grip and tactile feel of the product.

The overmolding temperature is generally controlled at 30-50°C, but for some TPE grades with strong crystallinity,

Styrenic transparent TPE is widely used in the footwear industry, largely replacing rubber; at the same time, its use in industrial rubber products such as rubber sheets and plates is also expanding.

To achieve the matte appearance of thermosetting rubber surfaces, a rougher mold surface is required. Generally, the rough surface produced by electrical discharge machining (EDM) on the mold cavity will result in an excellent workpiece appearance and make demolding easier. Grinding methods such as steam blasting, sandblasting, or shot blasting, as well as chemical etching, can also be used to produce surfaces with different gloss and appearance.

Rubber TPE customization

The mold temperature can be appropriately increased to 70°C, which is beneficial for bonding and can obtain a more glossy overmolded surface.