First of all, the polyolefin masterbatch production: all kinds of polyolefin base material and various functional auxiliary materials according to the formula ratio weighing and then mixed; will be mixed into the material into the twin-screw extruder pelletizing production of polyolefin functional masterbatch.
Product molding process: according to the different shapes of the product can be used in single-screw extrusion and injection molding two ways to process production:
1, single-screw extrusion: mainly used for heat shrinkable tubing extrusion molding, such as single-wall heat shrinkable tubing, double-wall heat shrinkable tubing with adhesive, medium-thick wall heat shrinkable tubing, high-pressure female heat shrinkable tubing, high-temperature heat shrinkable tubing and other products are used in the heat shrinkable tubing. Heat shrink tubing and other products are processed using single-screw extrusion molding, a mature heat shrink tubing production line should have the following equipment: extruder (heat shrink tubing molding), production molds, cooling water tanks, tension device, closing device, and so on.
2, injection molding: mainly used for the production of heat-shrinkable shaped parts, such as heat-shrinkable caps, heat-shrinkable umbrella skirt, heat-shrinkable finger casing and other products are used in the production of injection molding, the production equipment should include injection molding machines, injection molds and so on.
The next step is an important step, radiation crosslinking, extrusion or injection molding processing molded products or linear molecular structure, the product does not have a "memory function", temperature, aging, abrasion resistance and other properties are not enough, this time the need for molding the molecular structure of the product to change. We usually use radiation cross-linking modification: electron gas pedal radiation cross-linking, cobalt source radiation cross-linking, peroxide chemical cross-linking, at this time the molecules from the linear molecular structure into a mesh structure. Extruded products after crosslinking with a "memory effect", greatly enhancing the heat shrinkable tube temperature resistance, mechanical properties, chemical properties, specifically in the heat shrinkable tube from the molten state into a non-melting, aging resistance, abrasion resistance, chemical corrosion resistance and so on.
Expansion molding: After radiation crosslinking modified products already have "shape memory effect", and has a high temperature and then do not melt performance. Through high-temperature heating, vacuum blowing up the fixed warp, cooling is completed to become a finished heat-shrinkable tube, and then according to the actual situation of the tube for finished product packaging and closing, but also according to customer demand for cutting and printing. Neutral normal packaging is also available.