How to choose TPE material manufacturer in Guangdong

TPE overmolding generally adopts a two-shot injection molding process,

SEBS is the product of hydrogenation of SBS. SEBS has a saturated molecular structure, which makes its properties very different. It has the necessary aging resistance, yellowing resistance, and other traits required to produce transparent TPE, and also contributes to excellent high temperature and corrosion resistance. Thus, transparent TPE is produced.

Thickness of TPE, TPR overmolding layer. In most overmolding applications, a wall thickness range of 1.5-3.0mm ensures good adhesion. If the TPE layer is too thin, injection molding is difficult, adhesion strength is low, and hand feel is poor. If the TPE layer is too thick, on one hand the cost is high, and on the other hand, defects like sink marks and bubbles may occur.

tpe material manufacturer

Fix the already molded (injected) hard plastic part onto the overmolding mold, then at a suitable temperature, inject and bond the TPE soft plastic onto the hard plastic part, and cool to obtain the product. The injection temperature for overmolding varies depending on the hard plastic material.

TPE overmolding generally uses a two-shot injection molding process, i.e., fixing the molded hard plastic part onto the overmolding mold,

The wall thickness of the TPE layer should be as uniform as possible to achieve the best molding cycle. The transition between different wall thicknesses should be gradual to reduce problems caused by fluid flow, such as gas marks and bubbles.

Transparent grades are divided into transparent and semi-transparent series, each with multiple hardness levels; excellent transparency; smooth and soft surface; good yellowing resistance, tear resistance, and tensile strength; environmentally friendly; suitable for various transparent series products.

tpe material manufacturer

Then at a suitable temperature, inject and bond the TPE soft plastic onto the hard plastic part, and cool to obtain the product. The injection temperature for overmolding varies depending on the hard plastic material.

TPE is used in overmolding, with TPE soft plastic as the soft outer covering layer,

Because transparent TPE material requires high transmittance, the surface quality of the material product must be strictly controlled, with no defects such as streaks, pores, whitening, haze, black spots, discoloration, poor gloss, etc. Therefore, throughout the injection molding process, strict and even special requirements must be placed on the TPE raw material, equipment, mold, and even product design.

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

tpe material manufacturer

Commonly matched hard materials are mainly plastics, also metals and fabrics. TPE overmolding onto fabric is mainly used in luggage products, similar to metal overmolding, generally it is false overmolding. True overmolding is more common in two-shot and two-color injection molding, where the main material for TPE overmolding is plastic.