Plastic Extruders
Plastic extruder principle
Dec 09 , 2019
Plastic extruder is widely used for processing pipes, rods, monofilaments, plates, films, wire and cable coatings, profiles, etc. Like plastic pipe extruder,Plastic solid rod extruder,plastic sheet extruder,etc. The principle of a plastic extruder is that solid plastic is melted and plasticized under the conditions of heating and screw rotation of the extruder, and a continuous plastic product having the same cross-section and shape as a mold is made of the following mold: a specific shape. The manufacturing materials mainly include carbon structural steel and alloy tools. Some extrusion dies are also embedded with wear-resistant materials, such as diamond on parts that require wear resistance. Extrusion processes are generally only suitable for the production of thermoplastic products, which are structurally different from injection and compression molds.

Principle of plastic extruder:
Foam extrusion: Thermoplastic elastomer tpv can be foamed by chemical and mechanical methods. For chemical foaming, a foaming agent such as a bihydrochloride can be used. The achievable specific gravity of foam density is 0.97 (usually unfoamed tpv) to 0.70. The lower density is affected by patents. Blowing agents degrade at 180 ° C to 190 ° C, as most tpv's are based on 195 to 215 ° C.

Multi-layer extrusion: Co-extrusion is a technology that combines two materials into one part in one extrusion process. The two extruders are connected in series to provide a bottom die, and the corresponding polymer materials are co-extruded together along the corresponding channels to obtain the extruded glue of the two materials. It is possible to fuse homogeneous materials such as tpv and polypropylene. Multi-layer extrusion is a good way to mix hard and soft materials. In general, high hardness parts (such as thermoplastic elastomer tpv) are often used as support structures for components, while low hardness materials provide flexibility. This is common in sealing applications because the sealing area is soft and the soft material can be crushed for a good sealing effect. In the process of balancing the flow field, it is relatively simple to use a thermoplastic elastomer tpv with higher hardness instead of polypropylene as a rigid material.

Welded joints: Thermal welding is a popular method for joining extruded gels made using tpv. Heat is introduced into the joining surface, causing the surface to melt, then bonding the surfaces together and applying a slight pressure to ensure that no gas enters the interface. After cooling, the joint is almost as strong as the part itself. Another method of joining extruded parts is to use a bonding system.
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