cause of issue:

① resin raw material type is not right, not blown film grade low density polyethylene resin particles, which does not contain the opening agent or the low content of the opening agent;
② molten resin temperature is too high, too much liquidity;
③ the inflation ratio is too large, resulting in poor film opening;
④ cooling rate is too slow, the film cooling is insufficient, under the action of the pressure of the traction roller adhesion;

⑤ traction too fast.

Solution:

① replace the resin raw materials, or to the fighting to add a certain amount of open agent;
② appropriate to reduce the extrusion temperature and resin temperature;
③ appropriate to reduce the inflation ratio;
④ increase the air volume, improve the cooling effect, speed up the film cooling rate;
⑤ appropriate to reduce the speed of traction.

cause of issue:
① film thickness is not uniform;
② cooling effect is not enough;
③ inflation ratio is too large, resulting in bubble instability, left and right swing back and forth, prone to wrinkles;
④ the angle of the splint is too large, the bubble in the short distance was flattened, so the film is also prone to wrinkles;
⑤ the pressure on both sides of the traction roller is inconsistent, while the high side of the low;
⑥ The axis between the guide rollers is not parallel, affecting the stability and flatness of the film, resulting in wrinkles.

Solution:
① adjust the thickness of the film to ensure uniform thickness;
② improve the cooling effect, to ensure that the film can be fully cooled;
③ appropriate to reduce the blow ratio;
④ appropriate to reduce the angle of the word splint;
⑤ adjust the pressure of the traction roller to ensure uniform force of the film;

⑥ Check the axes of the guide shafts and make them parallel to each other.

cause of issue:
① the temperature of the molten resin is too high, will reduce the longitudinal tensile strength of the film;
② the traction speed is slow, the film longitudinal orientation is not enough, so that the longitudinal tensile strength deterioration;
③ the inflation ratio is too large, with the traction ratio does not match, so that the lateral orientation of the film and tensile strength, while the longitudinal tensile strength will be worse;
④ film cooling rate too fast.

Solution:
① appropriate to reduce the temperature of molten resin;
② appropriate to improve the speed of traction;
③ adjust the inflation ratio, so that with the traction ratio to adapt;
④ appropriate to reduce the cooling rate.

cause of issue:
① the extrusion temperature is low, poor resin plastic, resulting in poor transparency after blow molding film;
② inflation ratio is too small;
③ cooling effect is poor, thus affecting the transparency of the film;
④ the moisture content of the resin raw material is too large;
⑤ traction speed too fast, thin film cooling.

Solution:
① appropriate to increase the extrusion temperature, so that resin can be even plastic;
② appropriate to improve the inflation ratio;
③ increase the air volume, improve the cooling effect;

④ drying of raw materials;

⑤ appropriate to reduce the speed of traction.

cause of issue:
① die gap and extrusion volume is too large, so the film thickness is thick;
② cooling air ring air volume is too large, the film cooling too fast;
③ traction speed is too slow.

Solution:
① adjust the die gap;
② appropriate to reduce the air volume of the air ring, so that the film further inflated, so that the thickness of some thinner;

③ appropriate to improve the speed of traction.

cause of issue:
① uniformity of the mouth gap directly affect the film thickness uniformity, if the die gap is not uniform, some parts of the gap is larger, some parts of the gap is smaller, resulting in the amount of extrusion is less, therefore, the formation of The film thickness is also inconsistent, some parts of thin, some parts of the thick;
② die temperature distribution is uneven, with high and low, so that after the blown thin film thickness uneven;
③ cooling air around the air volume is inconsistent, resulting in uneven cooling effect, so that the thickness of the film appears uneven phenomenon;
④ inflation ratio and traction ratio is not appropriate, so that the film thickness is not easy to control;
⑤ traction speed is not constant, constantly changing, which of course will affect the thickness of the film.

Solution:
① adjust the nose gap to ensure uniformity of the same place;
② adjust the nose die port temperature, so that the mold part of the temperature uniform;
③ adjust the cooling device to ensure that the outlet of the air volume uniform;
④ adjust the inflation ratio and traction ratio;
⑤ Check the mechanical transmission so that the traction speed is kept constant.

cause of issue:
① extrusion temperature is low, resin plastic poor;
② resin moisture, moisture content is too high.

Solution:
① Adjust the temperature setting of the extruder and increase the extrusion temperature as appropriate.

② the resin raw materials drying, the general requirements of the water content of the resin can not exceed 0.3%.

cause of issue:
① die gap is too small, the resistance is too large, so thin film thickness;
② cooling air ring air volume is too small, the film cooling too slow;
③ traction speed is too fast, the film stretched too much, so that the thickness of thinning.

Solution:
① adjust the die gap;
② appropriate increase the air volume of the wind ring to speed up the cooling of the film;

③ appropriate to reduce the speed of traction.

cause of issue:
① dew point is too low, the polymer molecules orientation, so that the performance of the film close to the orientation film, resulting in reduced heat sealing performance;
② blowout ratio and traction ratio is not appropriate (too large), the film tensile orientation, thus affecting the film's heat sealing performance.

Solution:
① adjust the size of the air ring in the wind, so that the dew point a little higher, as far as possible in the plastic melting point under the inflation and traction to reduce the inflation and traction caused by molecular stretching orientation;
② blowout ratio and traction ratio should be appropriate smaller, if the inflation ratio is too large, and the traction speed is too fast, the film transverse and longitudinal stretching too much, then the film will make the performance tend to two-way stretch, Heat sealing will be worse.

cause of issue:
① Extrusion temperature is too high, the flow of molten resin is too large, the viscosity is too small, prone to fluctuations;
② extrusion temperature is too low, less material;
③ cooling air ring of the air volume is unstable, bubble bubble is not uniform;
④ by the external strong air interference and influence.

Solution:
① adjust the extrusion temperature;
② adjust the extrusion temperature;
③ check the cooling air ring, to ensure that the air volume around the same uniform;

④ to prevent and reduce the interference of external airflow.

cause of issue:
① traction speed is too fast, with the expansion ratio is too large, so that the vertical fiber, transverse strength becomes worse;
② cooling air ring cooling rate is too slow.

Solution:
① appropriate to reduce the traction speed, so that with the inflation ratio match;
② increase the air volume of the wind ring, so that the rapid expansion of the expansion film, to avoid the high temperature in the high elastic state was stretched orientation.

cause of issue:
① extrusion temperature is too low, resin plastic poor;
② Extrusion speed too fast.

Solution:
① adjust the extrusion temperature settings, and appropriate to improve the extrusion temperature, to ensure good resin plastic;

② appropriate to reduce the extrusion speed.

cause of issue:
① resin raw material itself smell;
② melt resin extrusion temperature is too high, resulting in resin decomposition, resulting in odor;
③ film bubble cooling is not enough, the bubble inside the hot air is not ruled out clean.

Solution:
① replace the resin raw materials;