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Changshu smoothly da plastic products factory talk about ABS plastic special-shaped material to plastic extrusion machine requirements
by：CSSSLD
2021-01-23
ABS plastic special-shaped material, ABS plastic tubing to control the extruder what are the conditions, the following smoothly da plastic products factory in changshu on ABS plastic special-shaped material to plastic extruder, about the following four conditions for your reference:
1, raw material drying
ABS plastic different profile has certain moisture absorption, moisture content is in commonly 0. 3% - — 0. Before the 8% range, processing on the dry processing, generally will be ABS resin in 80 & ndash; — Around 85 ℃ constant temperature drying 4 h, after drying of ABS resin moisture content should be less than 0. 2%. If insufficient drying, ABS plastic different profile surface will appear Ban mark, water lines or foaming phenomenon. If the drying time is too long or drying temperature on the high side, can cause yellowing of ABS resin agglomerate, ABS plastic mechanical products.
2, equipment
ABS extruding tube USES the single screw extruder, twin screw length to diameter ratio ( L / D) For 18 & ndash; — 22, the compression ratio of 2. 5 - — 3; Plastic extruder hopper can be configured drying preheating device, barrel can take exhaust type structure.
3, plastic extrusion machine machine cylinder and head temperature
under the condition of satisfy normal extrusion plastic extruder, barrel temperature 160 & ndash; — Temperature of 180 ℃, the nose 175 & ndash; — 185℃。 Good high temperature melt flow, but plastic extrusion and unstable fluctuation is too big, difficult to guarantee the quality of extrusion products; High temperature is easy to cause raw material degradation. The temperature of the connector generally lower than the screw head of homogenization temperature of 5 ℃, or with temperature. The temperature of ABS extruding the liquidity difference of raw material, the high temperature materials easily degradable discoloration, extrusion volatility; Low temperature easily blocked vent, the vacuum degree decline, extrusion profile surface bubbles.
4, the control of cooling condition
from the mouth of die extrusion parison with the timely and reasonable way of cooling and appropriate cooling water for cooling to finalize the design, can get ideal products. ABS profile extrusion process of cooling water temperature at 14 & ndash; — 18 ℃ ideal, effective water pressure should be greater than zero. 2 MPa。 In the process of producing, ABS plastic different profile, if small cooling water temperature too high or low water pressure, water flow, make the ABS plastic different profile after the stock mould temperature on the high side even after deformation, should be appropriate to reduce the extrusion speed, to ensure that the cooling time. If the cooling water temperature is too low, will form the cold snap, internal residual internal stress, easy to make ABS plastic different profile after deformation occurring in the process of natural storage or cause excessive traction resistance even quiver.
1, raw material drying
ABS plastic different profile has certain moisture absorption, moisture content is in commonly 0. 3% - — 0. Before the 8% range, processing on the dry processing, generally will be ABS resin in 80 & ndash; — Around 85 ℃ constant temperature drying 4 h, after drying of ABS resin moisture content should be less than 0. 2%. If insufficient drying, ABS plastic different profile surface will appear Ban mark, water lines or foaming phenomenon. If the drying time is too long or drying temperature on the high side, can cause yellowing of ABS resin agglomerate, ABS plastic mechanical products.
2, equipment
ABS extruding tube USES the single screw extruder, twin screw length to diameter ratio ( L / D) For 18 & ndash; — 22, the compression ratio of 2. 5 - — 3; Plastic extruder hopper can be configured drying preheating device, barrel can take exhaust type structure.
3, plastic extrusion machine machine cylinder and head temperature
under the condition of satisfy normal extrusion plastic extruder, barrel temperature 160 & ndash; — Temperature of 180 ℃, the nose 175 & ndash; — 185℃。 Good high temperature melt flow, but plastic extrusion and unstable fluctuation is too big, difficult to guarantee the quality of extrusion products; High temperature is easy to cause raw material degradation. The temperature of the connector generally lower than the screw head of homogenization temperature of 5 ℃, or with temperature. The temperature of ABS extruding the liquidity difference of raw material, the high temperature materials easily degradable discoloration, extrusion volatility; Low temperature easily blocked vent, the vacuum degree decline, extrusion profile surface bubbles.
4, the control of cooling condition
from the mouth of die extrusion parison with the timely and reasonable way of cooling and appropriate cooling water for cooling to finalize the design, can get ideal products. ABS profile extrusion process of cooling water temperature at 14 & ndash; — 18 ℃ ideal, effective water pressure should be greater than zero. 2 MPa。 In the process of producing, ABS plastic different profile, if small cooling water temperature too high or low water pressure, water flow, make the ABS plastic different profile after the stock mould temperature on the high side even after deformation, should be appropriate to reduce the extrusion speed, to ensure that the cooling time. If the cooling water temperature is too low, will form the cold snap, internal residual internal stress, easy to make ABS plastic different profile after deformation occurring in the process of natural storage or cause excessive traction resistance even quiver.
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