A brief introduction to the manufacturing process of heat shrinkable sleeves

In today's society, heat shrinkable sleeves are widely used in electronics, electric power, cable fields, etc. and play an important role in social development in daily life. Heat shrinkable sleeve is the alloy of polyolefin and its polymer that is cross-linked by radiation. After high-energy ray radiation, it produces ashape memory; effect, so as to achieve the purpose of covering various wires and cable joints and mentioning the purpose of insulation protection. Derivatives of heat-shrinkable sleeves have spread to various fields and industries through our continuous development. So what are the manufacturing processes of heat shrinkable sleeves? It is mainly divided into four parts: the first mixing and granulation, the second extrusion molding, the third radiation cross-linking, the fourth expansion and shaping, and the packaging.

;The heat shrinkable sleeve production process has the following three points:

1. Has a chemical formula

2. Molding technology (extrusion molding technology, injection molding technology)

3. Transmission control technology, tension control technology, expansion production technology and other production technologies that require accurate calculation;

The manufacturing process of heat shrinkable sleeve has the following four points:

1. Expansion stereotypes

Heat the radiation-crosslinked plastic pipe to a high elastic state, and then use an expansion machine to expand to obtain a heat-shrinkable sleeve. The expansion and shaping process parameters are: temperature 120~150℃, input speed 8~10Hz, pull-out speed 8 ~10Hz, vacuum degree -0.06MPa.

2. Extrusion

Extrusion molding is completed by extruder, cooling water tank, tractor, tensioner and winder. Its technological parameters are: extrusion speed 20~50r/min, traction speed 30~50Hz, extruder temperature 90~130℃.

3. Mixing and granulation

Weigh various raw materials according to the formula, and use a high-speed mixer to mix them evenly. The mixing amount is 110kg at a time, and the mixing time is 8~12min. Mixing and granulation is completed by a granulator, a cooling water tank, a blow dryer and a pelletizer. The parameters of the mixing and granulation process are: the main engine speed is 1 000~1 400r/min, the feeder speed is 50~80r/min, the body temperature is 110~160℃, and the head temperature is 190~240℃.

4. Radiation cross-linking

Radiation cross-linking is completed by electron accelerator and under-beam transmission device. The function of electron accelerator is to generate rays and irradiate plastic pipes to make them cross-link. The function of under-beam transmission device is to continuously send plastic pipes into and out of electrons. For the accelerator, after the winding times are determined, the required radiation dose can be obtained by controlling the electron accelerator beam current and the speed of the transmission device under the beam.

The above production processes can greatly reduce the investment cost of heat shrinkable sleeves, reduce energy consumption and enterprise production costs, improve production efficiency and product quality, and produce products with relatively high mechanical strength and long service life. Corrosion, aging resistance, environmental pressure resistance and other advantages.

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