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Plastic Sheet Extrusion Machine

Plastic Sheet Extrusion Machine
Feature 1. The vacuum calibrator featured with wear-resistance, dirty free and the lifting, falling and leveling for the forming plates is much easier to be controlled. 2. High speed screw, low energy consumption with high rotation speed to match gear pump and stable pressure; output capacity is...
Product Details:

Feature

1. The vacuum calibrator featured with wear-resistance, dirty free and the lifting, falling and leveling for the forming plates is much easier to be controlled.
2.  High speed screw, low energy consumption with high rotation speed to match gear pump and stable pressure; output capacity is 25% higher than other brand extrusion lines,because of special design of forming plates.
3. Special designed cooling system for all section of forming plates, and unique designed vacuum system for each section of forming plate.
4.  Special designed temperature control oven with cross heat shrink forming, which is much easier to be controlled than other brand extrusion lines.
5.  The softness of pull rolls could be customized on request to extend its stretch.
6.  The air capacity of hollow sheet and low pressure could be adjusted and controlled slightly, which is easily to be controlled than any other brand extrusion lines.
7.  Unique T-Die made by JC Times is specially designed for PP hollow sheet. The thickness of hollow sheet could be from 2mm to 10 mm with twin-wall. The ribbed between walls could be rectangular and diagonal shape.
8.  Anti-UV co-extrusion layer could be one sided or two sided, outer surfaces could be sandy or glossy according to configuration requirement.

Parameter

Extruder model

100

120

Product width

1300mm

2100mm

Product thickness

2-10mm

2-10mm

Motor power

110kw

132kw

Capacity

250-300kg/h

400-450kg/h

Precaution

(1) The temperature of each section of the barrel of the plastic sheet production equipment is gradually increased from the feeding section to the junction of the barrel and the forming mold.

(2) The molding die temperature is slightly higher than the barrel temperature. The temperature is controlled above 5-10 °C. The temperature at both ends of the mold is slightly higher than the temperature in the mold, and the temperature is controlled at 5-10 °C.

(3) In the form of film, the upper roller surface of the three rolls should be on a horizontal plane with the lower surface of the die lip; the lip end face is parallel to the center line of the intermediate roll, and the distance is 50~100mm.

(4) The gap between the lip of the mold should be slightly less than or equal to the thickness of the plate product, and the gap between the lips should be slightly smaller than the gap between the lips on both sides.

2pm。 (5) Note that the roughness R of the three-roll working surface should not be greater than 0. 2pm. When cleaning the roll surface, it is not allowed to scrape the roll surface with a hard steel knife. The copper knife should be used to clean the roll surface residue.

(6) The roll surface should have some medium height; the gap between the three rolls should be equal to or slightly larger than the thickness of the plate.

(7) The temperature control of the molding die should be stable. When the temperature is high, the flow rate of the melt in the mold becomes faster; when the temperature is low, the flow rate of the melt in the mold becomes slow. Unstable melt flow rates can cause large longitudinal thickness errors in the sheet (sheet) article.

(8) Pay attention to controlling the working surface temperature of the three rolls, which should be that the feed roll temperature is slightly higher and the exit roll temperature is slightly lower. The temperature of the roll surface is high, the slab is not easy to be detached, and the surface of the product is easy to produce horizontal stripes; the temperature is low, and the surface of the product is not shiny. According to this phenomenon, the roll surface temperature control should be adjusted in time.

(9) The running speed of the three rolls is slightly higher than the extrusion speed of the slab from the die mouth, and the general speed difference does not exceed 10%. The working speed of the three rolls should be controlled smoothly, and the running speed of too fast or too slow has a great influence on the thickness error of the board.

(10) When the polyolefin plastic extruded sheet (sheet) material, the screw adopts a mutant structure, the compression ratio is (3-4): 1, and the melt flow rate is: HDPE 0.3 to 2.0 g/10 min, LDPE 0.1~0.3g/1Omin, PP 0.5~1. 5g/10min. ABS and other non-crystalline high-polymer resin extrusion-molded sheets (sheets) should be a tapered screw with a compression ratio of (1.6 to 2.5):1.

(11) Extrusion molding of plastic sheets (sheets), except for the general case that the polyvinyl chloride, polyethylene and polypropylene resins are not dehumidified before extrusion, some other plastics (such as ABS, polyamide, etc.) should be Dehumidification is required before extrusion. Otherwise, it should be extruded using a vented extruder.

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