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Summary Of Heat Sealing Problems Of Packaging Bags M

Summary Of Heat Sealing Problems Of Packaging Bags M

2024-11-26 17:03:23

1. Pre-adjusted film feeding length: The error between the pre-adjusted film feeding length (when adjusting the white bag) and the actual bag size is too large. When the scanning area does not cover the cursor, it can directly lead to inaccurate tracking.
 
2. The influence of processing speed of plastic composite film bag making When the processing speed of bag making is faster, the deviation related to length control increases obviously. The main reason is that under the action of high-speed inertia, the actions of cutting knife and feeding roller are affected to different degrees due to the actions of heat sealing knife, cutting knife and feeding roller, which also leads to the increase of deviation such as bottom edge margin. However, it is possible to make errors in the bag making system with high manufacturing precision, and it can be basically stable after adjustment. In addition, when the process of film speed-up and speed-down is too fast, due to the existence of inertia, it is also easy to cause the film error to be too large.
 
3. Operating factors The pressure setting of the rubber roller pressure cylinder is insufficient. Improper tension setting of each section. Especially for thinner composite films, excessive tension may cause changes in spacing, and the tension should be carefully set.
 
Solution:
(1) Adjust the fixed length system.
(2) Adjust the working state of the electric eye.
(3) Check whether there is a cursor printing problem or a spacing problem, and adjust it.
(4) Check whether the film friction coefficient of the pressurized film ruler is appropriate.
(5) The pre-adjusted film length (when adjusting the white bag) and the actual bag size should be as accurate as possible.
(6) Reduce the speed of bag making, and adjust the speed of bag making.
(7) Adjust the pressure of the rubber roller, the pressure of the cylinder and the tension of each part.
 
4. What if there is a deviation in the width of the bag and the folding seam is not strict? (Middle seal, side seal)
Cause analysis:
(1) the film thickness is not uniform.
(2) The size of the specification plate is out of tolerance.
(3) film wrapped specification plate tightness improper. The tighter the wrapping, the greater the resistance, and it will also affect the loosening of the bag, which is prone to lax joints.
 
Solution:
(1) adjust the specification board.
(2) adjust or replace the composite film.
(3) Adjust the tightness of the film wrapping specification board. For thinner films, transverse shrinkage will occur when they are tightened. The tight size should be smaller than the standard size. For thicker films, due to the influence of thickness, the size of the plate should also be smaller than the standard size.
 
5. What if the upper and lower sides are not allowed?
Cause analysis:
(1) the thin and thick composite film is uneven, with flounces.
(2) The double floating roller tension is too small.
 
Solution:
(1) adjust the double floating roller tension.
(2) Check and adjust the relevant guide roller (such as compensation roller, adjusting roller, etc.)
 
6.What if the cutting line is not neat?
Cause analysis:
(1) the cutter wear.
(2) The pressure of the pressure Spring of the cutter is insufficient.
(3) the knife angle adjustment is not good.
(4) There are foreign objects on the cutter.
(5) The cutter is bent.
(6) cooling effect resin viscosity is too high, the strength is too large.
Solution:
(1) replace or adjust the cutter.
(2) Adjust the pressure of the pressure Spring of the cutter.
(3) Adjust the angle of the upper blade.
(4) Enhance the cooling effect.
(5) Adjust the base material resin formulation.
 
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