Foaming extrusion: Thermoplastic elastomer tpv can be foamed by chemical and mechanical methods. For chemical foaming, foaming agents such as bihydrochloride can be used. The achievable foam density specific gravity ranges from 0.97 (typical unfoamed tpv) to 0.70. The lower density is affected by patents. Blowing agents will degrade at 180°C to 190°C, because most of the tpv base is performed at 195 to 215°C.
Multi-layer extrusion: Co-extrusion for rubber extruder machine is a technology that combines two materials into one part in one extrusion process. Two extruders are connected in series to provide a bottom mold and make respective polymer materials co-extruded together along corresponding channels to obtain an extruded glue of the two materials. Homogeneous materials, such as tpv and polypropylene, can be fused together. Multi-layer extrusion is a good way to mix hard and soft materials. Typically, high-hardness cross-sections, such as thermoplastic elastomer tpv, are generally used as a support structure for components, while low-hardness materials provide flexibility. This is very common in sealing applications, because the sealing area is soft and the soft material can be squashed to get a good sealing effect. In the process of balancing the flow field, it is simpler to use thermoplastic elastomer tpv with higher hardness as a rigid material instead of polypropylene.
Welding joints: Thermal welding is a popular method for joining extruded glue made of tpv. Heat is introduced to the connecting surface to melt the surface, and then the surfaces are bonded together, and a slight pressure is applied to ensure that no gas enters between the contact surfaces. After cooling, the strength of the joint is almost the same as that of the part itself. Another way to join extruded parts is to use an adhesive system.
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