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Extrusion of PE thick sheet
1. Extrusion process characteristics
HDPE should use a non-venting single-screw extruder. Due to the large shrinkage in the material flow direction and the large degree of crystallinity, a higher barrel temperature and a lower die temperature are generally used. In the calender of HDPE sheet, care should be taken to prevent the occurrence of continuous and multi-layer wrapping accidents caused by excessively high temperature of the middle and upper rolls. In case of wrapping roller, stop immediately. Too low temperature of the bottom roll will cause the two sides to warp up, and too low temperature of the middle and top rolls will cause the two sides of the sheet to bend downwards.
LDPE sheet is easy to process, only need to control the temperature of the exit roll to be 88¡«98¡æ, then the temperature of the sheet will drop to 46¡«48¡æ when it enters the traction roller.
2. Raw material selection
Use LDPE resin with MFR of 0.3¡«2.0g/10min or HDPE resin with MFR of 0.1¡«1.0g/10min; it is best to adopt extrusion grade or extruded sheet grade resin.
If special-purpose PE boards and sheets are produced or dyeing is required, a small amount of antioxidants or crosslinking agents, foaming agents, and coloring agents need to be added. You can first mix the PE resin particles with turpentine or white oil dispersant, make the dispersant evenly spread on the resin surface, then add the additives to mix, let the additives adhere to the resin surface, and then add the extruder to extrude the board or sheet.
3. Equipment selection
1. Extrusion process characteristics
HDPE should use a non-venting single-screw extruder. Due to the large shrinkage in the material flow direction and the large degree of crystallinity, a higher barrel temperature and a lower die temperature are generally used. In the calender of HDPE sheet, care should be taken to prevent the occurrence of continuous and multi-layer wrapping accidents caused by excessively high temperature of the middle and upper rolls. In case of wrapping roller, stop immediately. Too low temperature of the bottom roll will cause the two sides to warp up, and too low temperature of the middle and top rolls will cause the two sides of the sheet to bend downwards.
LDPE sheet is easy to process, only need to control the temperature of the exit roll to be 88¡«98¡æ, then the temperature of the sheet will drop to 46¡«48¡æ when it enters the traction roller.
2. Raw material selection
Use LDPE resin with MFR of 0.3¡«2.0g/10min or HDPE resin with MFR of 0.1¡«1.0g/10min; it is best to adopt extrusion grade or extruded sheet grade resin.
If special-purpose PE boards and sheets are produced or dyeing is required, a small amount of antioxidants or crosslinking agents, foaming agents, and coloring agents need to be added. You can first mix the PE resin particles with turpentine or white oil dispersant, make the dispersant evenly spread on the resin surface, then add the additives to mix, let the additives adhere to the resin surface, and then add the extruder to extrude the board or sheet.
3. Equipment selection
The extrusion equipment usually uses a single screw extruder, the screw diameter is 90-120mm, the L/D is 25, and the screw geometric compression ratio is 3.5-4.0. The head is usually branched.
Company Profile
Company Address: No. 11, Kaifeng Road, Moling Street, Jiangning District, Nanjing City, Jiangsu Province
Nanjing Sumino Precision Machinery Co., Ltd. is a high-tech enterprise integrating scientific research, production and sales. It has always adhered to the business philosophy of integrity, equality, and customer benefits. In order to better improve the quality of equipment, it has entered a more professional and standardized Production track. We have established independent research and development technologies for seven categories of equipment including plastic sheet material, casting, bi-stretching, non-woven non-woven meltblown cloth, laminating film composite, recycled granulation environmental protection recycling system and coating machine manufacturing system. The center and production department provide a full set of professional technical solutions to meet the special needs of each customer. Among them, the biaxially oriented film manufacturing system includes: BOPP biaxially oriented film manufacturing system, PVC biaxially oriented shrink film production line, PET biaxially oriented film production line, BOPA biaxially oriented film production line, BOPA biaxially oriented film production line, etc.