Introduction to the extrusion process of silicone extrusion strips

Silicone extruded strip

Extrusion process:

For products such as building doors and windows, large mechanical seals, and door valve electronic buffering and shock absorption, the size and design shape of the product are often key issues that affect performance. During the extrusion process, the shape design of the product is key. For example, if the size is a working shape or a thin hook shape, the size of the extrusion process will cause relatively tricky deformation; secondly, if the product is too large and the product size is not fixed, deformation may occur even if there is no fixed support point.

Extrusion processing is a relatively stable production process. Judging from the current form, silicone extrusion strip materials account for more than 70% of production and processing. Many silicone extrusion strip processing companies choose extrusion to abandon the molding process, focusing on product quality control issues. Just in terms of foam, deformation, appearance quality and materials.

Silicone extrusion strip molding process:

In addition to the targeted processing method extrusion, form hardening is considered to be one of the popular methods, but compared with silicon extrusion, the size issues are different. The difference between extrusion processing and molding production is that it can produce unlimited extended length dimensions and cannot be used as dividing line shapes, while molding processing can produce square, round, and heterogeneous sealing shapes.

Silicone extruded strips are strip-shaped products. During the manufacturing process, you can choose a variety of different processing methods to make them. Solid silicon and liquid silicon can be used together. Its performance is very good, mainly high and low temperature resistance and good physiological inertia. Can be used normally under various environmental conditions. Long-term use does not affect deformation and resilience. It has strong durability against external ozone, ultraviolet rays, and aging. The green color has no conflict with any substance.

Extrusion production process of silicone extruded strips:

1. Softener: Mix the rubber raw materials in the smelting machine, add double director agent, platinum vulcanizing agent or silicon masterbatch, and mix them into silicon protruding materials with uniform thickness.

2. Extrusion molding: Install the mold on the head of the silicon extruder. The refined rubber is scored into shapes of the same size to facilitate feeding from the inlet of the extruder. The material is then fed through a silicon extruder to extrude a shaped but soft silicon hose. The silicon hose is put into an 8-meter-long drying oven and vulcanized at high temperature. Please make a semi-finished product by baking silicon hose, and then wrap it.

3. High-temperature vulcanization: Put the wound silicon hose into the oven, generally 180 degrees for silicon, 200 degrees for vapor phase silicon hose, high temperature for 2 hours, and perform secondary vulcanization to remove the smell of the silicon hose and prevent spray and yellowing.

4. Subsequent processing: The rest is subsequent processing, such as cutting or gluing according to the length required by the customer, and then packaging and shipping to the customer as needed.