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Precautions.
(1) The temperature of each section on the barrel of the plastic sheet production equipment progresses gradually from the beginning of the charging section to the temperature at the connection between the barrel and the forming mould.
(2) The temperature of the mould is slightly higher than that of the barrel. Higher than the temperature control in 5 - 10 ¡ã C. Mould ends of the temperature is slightly higher than the temperature in the mould, higher than the temperature control in 5 - 10 ¡ã C.
(3) into the form, three rolls of the centre roll on the roll surface should be in a horizontal plane with the lower plane of the lip of the mould; lip end face and the centre of the centre roll parallel to the centre line, 50 ~ 100mm apart.
(4) Mould lip gap should be slightly less than or equal to the thickness of the board products, the centre of the lip gap should be slightly less than the two sides of the end of the lip gap.
(5) pay attention to the three roller surface roughness R should not be greater than 0.2pm. finishing roll surface is not allowed to scrape the roll surface with a hard steel knife, should be used to sort out the roll surface with a copper knife residue.
(6) The roll surface should have some height; the gap between the three rolls should be equal to or slightly greater than the thickness of the plate.
(7) moulding mould temperature control should be stable. When the temperature is high, the melt moves faster in the mould; when the temperature is low, the melt moves slower in the mould. Unstable melt flow rate will cause the longitudinal thickness of the plate (sheet) products large error.
(8) pay attention to the control of the three rollers of the working surface temperature, should be into the roll temperature is slightly higher, out of the roll temperature is slightly lower. Roll surface temperature is high, the slab is not easy to get off the roller, the surface of the product is prone to transverse lines; temperature is low, the surface of the product is not glossy. According to this phenomenon, the roll surface temperature control should be adjusted in time.
(9) three-roller operation speed should be slightly higher than the extrusion speed of the slab from the mouth of the mould, three-roller working speed to manipulate the smooth, too fast or too slow running speed on the thickness of the board have a greater impact on the error.
(10) polyolefin plastics extrusion moulding plate (sheet) material, screw selection of mutant structure, abs and other non-crystalline polymer resin extrusion moulding plate (sheet) material, should be used gradient screw.
Nanjing Suminoe Precision Machinery Co., Ltd. is a collection of scientific research, production, sales in one of the high-tech enterprises, and has always adhered to the integrity, equality, customer interests first business philosophy, in order to better improve the quality of equipment, into a more professional standardised production track. We set up a plastic sheet plate, casting, bi-directional stretching, non-woven nonwoven meltblown cloth, film composite, renewable granulation environmental protection recycling system and coating machine manufacturing system and other seven categories of equipment, independent research and development technology centre and production departments. Provide professional full set of technical solutions to meet the special needs of each customer. Among them, regarding the extrusion textile manufacturing category, there are SMS production line, S,SS,SSS production line, PP nonwovens production line, PP meltblown fabric production line.
(1) The temperature of each section on the barrel of the plastic sheet production equipment progresses gradually from the beginning of the charging section to the temperature at the connection between the barrel and the forming mould.
(2) The temperature of the mould is slightly higher than that of the barrel. Higher than the temperature control in 5 - 10 ¡ã C. Mould ends of the temperature is slightly higher than the temperature in the mould, higher than the temperature control in 5 - 10 ¡ã C.
(3) into the form, three rolls of the centre roll on the roll surface should be in a horizontal plane with the lower plane of the lip of the mould; lip end face and the centre of the centre roll parallel to the centre line, 50 ~ 100mm apart.
(4) Mould lip gap should be slightly less than or equal to the thickness of the board products, the centre of the lip gap should be slightly less than the two sides of the end of the lip gap.
(5) pay attention to the three roller surface roughness R should not be greater than 0.2pm. finishing roll surface is not allowed to scrape the roll surface with a hard steel knife, should be used to sort out the roll surface with a copper knife residue.
(6) The roll surface should have some height; the gap between the three rolls should be equal to or slightly greater than the thickness of the plate.
(7) moulding mould temperature control should be stable. When the temperature is high, the melt moves faster in the mould; when the temperature is low, the melt moves slower in the mould. Unstable melt flow rate will cause the longitudinal thickness of the plate (sheet) products large error.
(8) pay attention to the control of the three rollers of the working surface temperature, should be into the roll temperature is slightly higher, out of the roll temperature is slightly lower. Roll surface temperature is high, the slab is not easy to get off the roller, the surface of the product is prone to transverse lines; temperature is low, the surface of the product is not glossy. According to this phenomenon, the roll surface temperature control should be adjusted in time.
(9) three-roller operation speed should be slightly higher than the extrusion speed of the slab from the mouth of the mould, three-roller working speed to manipulate the smooth, too fast or too slow running speed on the thickness of the board have a greater impact on the error.
(10) polyolefin plastics extrusion moulding plate (sheet) material, screw selection of mutant structure, abs and other non-crystalline polymer resin extrusion moulding plate (sheet) material, should be used gradient screw.
Nanjing Suminoe Precision Machinery Co., Ltd. is a collection of scientific research, production, sales in one of the high-tech enterprises, and has always adhered to the integrity, equality, customer interests first business philosophy, in order to better improve the quality of equipment, into a more professional standardised production track. We set up a plastic sheet plate, casting, bi-directional stretching, non-woven nonwoven meltblown cloth, film composite, renewable granulation environmental protection recycling system and coating machine manufacturing system and other seven categories of equipment, independent research and development technology centre and production departments. Provide professional full set of technical solutions to meet the special needs of each customer. Among them, regarding the extrusion textile manufacturing category, there are SMS production line, S,SS,SSS production line, PP nonwovens production line, PP meltblown fabric production line.