Heat shrink tubing will shrink when heated, play a role in protecting the cable, many friends are more interested in the production process of heat shrink tubing, the following for you to introduce. Heat shrink tubing production process is divided into five steps:
1, masterbatch production
According to the formula with the various types of polyolefin base material and a variety of functional excipients in accordance with the formula proportion of the weighing and then mixing, will be mixed into a good material into the twin-screw extruder pelletizing production of polyolefin functional masterbatch.
2, molding
According to the different shapes of the heat shrinkable tube, there are two types of single-screw extrusion and injection molding:
(1) extrusion molding: single-wall heat shrinkable tubes, double-wall heat shrinkable tubes with adhesive, medium and thick-walled heat shrinkable tubes, high-pressure female heat shrinkable tubes, high-temperature heat shrinkable tubes, and other products are single-screw extrusion molding process.
(2) injection molding: mainly used to produce shaped parts, such as heat-shrinkable caps, heat-shrinkable umbrella skirt, heat-shrinkable finger sleeve products.
3, irradiation
The extrusion or injection molding products or linear molecular structure, the product does not have "memory function", temperature resistance, aging resistance, wear resistance and other properties are not enough, at this time it is necessary to change the molecular structure of molded products. Usually used for radiation crosslinking modification, so that the molecules from the linear molecular structure into a mesh structure.
4, expansion
The tube after irradiation crosslinking, can be used to preheat to a higher temperature with the external expansion of the way, the caliber of the tube becomes larger, and then quickly cooled to room temperature, so that the expansion of the shape of the tube will be stereotyped down to the finished product of the heat-shrinkable tube.
5, packaging
Testing the size of the heat shrinkable tube, qualified products printed packaging that completes the production of heat shrinkable tube.
Second, polyester heat shrinkable tube production equipment needed for which
The production of heat shrinkable tubes need to use a variety of equipment, more demanding than ordinary pipe production equipment, mainly:
1, extruder
For the production of masterbatch pelleting and extrusion molding process, there are two kinds of twin-screw extruder and single-screw extruder.
2, tube expanding machine
The raw materials and tube expanding agent are mixed evenly to make a thin tube, and then the thin tube is expanded in the tube expanding machine, which becomes a heat-shrinkable tube.
3, auxiliary machinery
Including sealing machine, cutting machine, etc., these are also one of the machinery needed for the production of conventional tubes.