Blown Film common faults and solutions

Film is too sticky, poor openings Fault: Dot print fabrics,non-woven products,non-woven bags,coverall shoe, Garbage Bag with Drawcord，Garbage bag with drawtape，non-woven products manufacturer，shoe cover ① resin material models do not, not blown film grade low density polyethylene resin particles, which does not contain openings, or openings agent agent content is low; ② the temperature of molten resin is too high, liquidity too; ③ Inflation over too much, resulting in the opening film of variation; ④ cooling rate is too slow, lack of film cooling, in the traction roller occur under the pressure of bonding with each other; ⑤ traction too fast.

The solution: Dot print fabrics① replacement resin raw materials, or to the Division of Sino-Canadian fighting a certain amount of opening agent; ② appropriate to reduce the temperature of extrusion temperature and resin; ③ Inflation lower than appropriate; ④ to increase airflow and improve cooling effect, speed up the film cooling speed; ⑤ appropriately reduced speed traction. 2. Poor transparency film Fault: ① extrusion temperature is low, resin plasticization bad, resulting in the transparency of the film after blow poor; ② Inflation ratio is too small; ③ poor cooling effect, thereby affecting the transparency of the films; ④ resin material in the water containing excessive; ⑤ traction too fast, lack of film cooling.

Solution: ① appropriately increasing the extrusion temperature, so that resin can be uniformly plasticization; ② appropriate increase over Inflation; ③ to increase air flow and improve cooling effect; to drying of raw materials; ⑤ appropriately reduced speed traction.

3. Membrane folds failure occurs because: ① uneven film thickness; ② is not enough cooling effect; ③ Inflation over too much, resulting in bubble instability, so swing back and forth, prone to wrinkles; ④ miter angle between the splint off large, membrane vesicle was crushed within a short distance, so films are also prone to wrinkles; ⑤ traction on both sides of the pressure roller is inconsistent while the high side of the low; ⑥ between the guide rollers are not parallel to the axis, affecting the stability of peace in film ductility, and thus wrinkles appear. The solution: ① to adjust the thickness to ensure uniform thickness; ② to improve the cooling effect, ensure that film can fully cool; ③ Inflation lower than appropriate; ④ be reduced when the angle between the herringbone splint; ⑤ traction roller to adjust the pressure force to ensure film uniformity; ⑥ check the orientation axis of the shaft and make it parallel to each other. 4, thin film a mist Watermark Fault: ① extrusion temperature is low, the resin plasticization bad; ② resin, damp, moisture content is too high. Solution: ① extruder to adjust the temperature settings, and appropriately increasing the extrusion temperature. ② the resin raw material drying, and general requirements of the resin moisture content can not exceed 0.3%. 5. Uneven film thickness Fault: ① die exit gap directly affect the uniformity of non-woven bags film thickness uniformity, if the die exit gap uneven, and some parts of larger gap, and some parts of space smaller, resulting in extrusion capacity more or less, therefore, also formed by film thickness is inconsistent, and some parts of thin, some thick parts; ② die exit temperature of uneven distribution of high and low, so that after the film Baohou blow uneven; ③ cooling air ring around the air supply is inconsistent, resulting in uneven cooling effect, so that the thickness of the film have uneven phenomenon; ④ Inflation ratio and traction than the inappropriate, difficult to control the thickness of the membrane vesicle; ⑤ traction speed is not constant, constantly changing, which of course will affect the thickness of the film. The solution: ① nose die exit gap adjustment to ensure uniform throughout; ② to adjust nose module port temperature, so that uniform temperature of mold mouth parts; ③ conditioning cooling device to ensure that air flow out the outlet of a uniform; ④ Inflation Adjustment ratio and traction ratio; ⑤ check the mechanical transmission device, so that traction to maintain a constant speed. 6. Film thickness of the partial thickness Fault: ① extrusion die exit clearance and the high levels, so partial thickness of the film thickness; ② cooling wind ring wind is too big, too fast film cooling; ③ traction too slow. The solution: ① adjustment mode port clearance; ② be reduced when the wind ring wind, so that film Inflation further, making it thinner number; ③ appropriately increasing the traction speed of 7. Film thickness of the thin, the reasons for failure: ① die mouth gap is too small, too much resistance, so partial thin film thickness; ② air flow cooling air ring is too small, too slow film cooling; ③ traction too fast, film stretching over, so that the thickness of thin. The solution: ① adjustment mode port clearance; ② appropriate increase in the wind ring wind, speed up the film cooling; ③ appropriately reduced speed traction. . Poor sealing film

Cause of the malfunction: ① dew point is too low, polymer molecules orientation, so that the performance of thin film near the orientation film, resulting in reduced sealing performance; ② Inflation ratio and traction than the inappropriate (too large), thin-film tensile direction occurs, thus affecting the sealing properties of films. The solution: ① adjust the amount of air ring the size of a stroke, so that a high dew point, as far as possible in the plastic under the melting point of Inflation and traction in order to reduce Inflation and traction caused by molecular orientation stretching; ② Inflation ratio, and Traction should be appropriately smaller than that, if the Inflation ratio is too large, too fast and pulling the film horizontal and vertical stretch too much, which would make the performance of thin film tends to a two-way stretch, sealing of film will be variation. 9. Longitudinal tensile strength of thin-film bad trouble because: ① the temperature of molten resin is too high, the longitudinal tensile strength of thin films will decrease; ② traction slower film role in the vertical orientation is not enough, so that the tensile strength of longitudinal variation; ③ Inflation ratio is too large compared with the traction does not match the horizontal orientation so that the role of film and tensile strength increase, while the longitudinal tensile strength would be worse; ④ film cooling too fast. Solution: ① appropriately lowering the temperature of molten resin; ② appropriately increasing the speed traction; ③ Inflation adjusted ratio to make it compatible with the traction ratio; ④ appropriately reduced cooling rate. 10. Film transverse tensile strength of difference Fault: ① traction too fast, with Inflation over that much difference, so that produce fibrosis of longitudinal and transverse strength of the variation; ② cooling air ring cooling rate is too slow. Solution: ① the appropriate traction to reduce the speed to make it compatible with more than Inflation; ② to increase air flow air rings, so that inflation film rapidly cooled to avoid the higher temperatures under the high-elastic state of being stretched orientation. 11. Vesicle instability Fault: ① extrusion temperature is too high, too much mobility of molten resin, the viscosity is too small, prone to fluctuations; ② extrusion temperature is too low, discharging less; ③ cooling wind ring air flow instability, uneven cooling film bubble; ④ has been a strong flow of foreign interference and influence. The solution: ① adjusting extrusion temperature; ② adjust extrusion temperature; ③ check the cooling air ring, the surrounding air supply to ensure uniform; ④ to prevent and reduce the interference of outside air.12, thin film surface roughness, uneven Fault: ① extrusion temperature is too low, resin plastics bad; ② out of too fast. The solution: ① to adjust extrusion temperature settings, and appropriately raise the extrusion temperature to ensure a good resin plasticization; ② appropriately reduced speed of extrusion. 13. Film has smell Fault: ① resin raw material itself has a strange smell; ② molten resin extrusion temperature is too high, causing resin decomposition, resulting in odor; ③ bubble cooling enough hot air inside the bubble did not rule out clean. The solution: ① the replacement resin material; ② adjust the extrusion temperature; ③ enhance the cooling efficiency of cooling air ring, so that the full cooling film bubble.

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