EVA automotive interior sheet extruder manufacturer

Car interior sheet extruder manufacturer
Car interior sheet extruder
Multi-layer composite co-extruded sheet is favored by the market due to its special properties. Dairy and beverage industries The development of the industry has placed higher and higher requirements on plastic cups. In addition to requiring good appearance quality, transparency, brightness, and stiffness, it also requires a long-term preservation function and shelf life, and a single-layer sheet cannot meet this requirement. [] The launch of multi-layer co-extruded composite sheets by sheet manufacturers is partly due to market demand, and on the other hand it is also the need for product upgrading. The single-layer sheet machine has low investment and the price of multiple sheets from competing manufacturers is low. However, multi-layer composite sheets require a large investment, but the competitors have fewer sheets and good quality. The thermoformed products produced are of high quality and have good market prices. Another reason is that the production of composite co-extruded plastic sheets can consume more recycled materials and reduce costs.
The main machine of the plastic extruder is the extruder, which consists of an extrusion system, a transmission system and a heating and cooling system. Extrusion system
The extrusion system includes a screw, barrel, hopper, die, and mold. The plastic is plasticized into a uniform melt through the extrusion system and is continuously extruded by the screw under the pressure established in the process. Exit the nose.
⑴Screw: It is the most important component of the extruder. It is directly related to the application scope and productivity of the extruder. It is made of high-strength and corrosion-resistant alloy steel.
⑵ Barrel: It is a metal cylinder generally made of alloy steel or composite steel pipe lined with alloy steel that is heat-resistant, has high compressive strength, is strong, wear-resistant, and corrosion-resistant. The barrel and screw cooperate to crush, soften, melt, plasticize, exhaust and compact the plastic and continuously and evenly transport the rubber material to the molding system. Generally, the length of the barrel is ~ times of its diameter in order to fully heat and plasticize the plastic.
⑶ Hopper: The bottom of the hopper is equipped with a cut-off device to adjust and cut off the material flow. The side of the hopper is equipped with a sight hole and a calibration metering device.
⑷ Machine head and mold: The machine head is composed of an alloy steel inner sleeve and a carbon steel outer sleeve. The machine head is equipped with a forming mold. The function of the machine head is to convert the rotating plastic melt into parallel linear motion for uniform and smooth introduction. mold set and give the plastic the necessary molding pressure. The plastic is plasticized and compacted in the barrel, flows through the porous filter plate along a certain flow channel through the neck of the machine head and into the mold core of the machine head. The mold sleeve is properly matched to form an annular gap with a continuously decreasing cross-section, so that the plastic melt is around the core line. Form a continuous dense tubular cladding layer. In order to ensure that the plastic flow channel in the machine head is effective and eliminate the dead corners where plastic accumulates, a shunt sleeve is often installed to eliminate pressure fluctuations during plastic extrusion. A pressure equalizing ring is also installed. The machine head is also equipped with a mold correction and adjustment device to facilitate the adjustment and correction of the concentricity of the mold core and mold sleeve.
According to the angle between the material flow direction of the extruder head and the center line of the screw, the extruder head is divided into an oblique angle head (included angle) and a right-angle machine head. The shell of the machine head is fixed to the fuselage with bolts. The mold inside the machine head has a mold core seat and is fixed to the wire inlet port of the machine head with a nut. A mold core is installed in front of the mold core seat and there is a hole in the center of the mold core seat. A pressure equalizing ring is installed at the front of the machine head through the core wire to balance the pressure. The extrusion molding part consists of a mold sleeve seat and a mold sleeve. The position of the mold sleeve can be adjusted by bolts and supports to adjust the relative position of the mold sleeve to the mold core. The position is convenient for adjusting the uniformity of the thickness of the extruded cladding. The outside of the machine head is equipped with a heating device and a temperature measuring device.
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