Summary of Bag Making Problems and Solutions

Pouch making is packaging Bag The last step in the production process. If the quality of pouch making is unqualified or the consumption is too high, then the previous steps will be in vain 。 Therefore, to make satisfactory packaging bags for customers, the problems of packaging bag making cannot be ignored. Here, Shunxingyuan Packaging, a professional flexible packaging manufacturer, has summarized the problems of packaging bag making and summarized some solutions based on its rich production experience.

1. Incomplete heat sealing of the bagging machine causes leakage or deterioration of the contents

Reason: Poor anti-pollution heat-sealability of the film, mainly due to the unsuitable resin used in the inner sealing layer.

Solution: Use a film with good anti-pollution heat-sealability.

Generally speaking, LDPE has moderate anti-pollution heat-sealability, EVA has good anti-pollution heat-sealability when the VA content is high, LDPE also has good anti-pollution heat-sealability, and ionic resins and metallocene polymers have excellent anti-pollution heat-sealability.

2. The sealing of the bagging machine is brittle and breaks

Reason:

（ 1) The heat sealing temperature is too high;

（ 2) The pressure is too high;

（ 3) The heat sealing time is too long;

（ 4) The edge of the upper sealing device is too sharp or the polytetrafluoroethylene covering is damaged;

（ 5) The silicone rubber at the bottom seal is too hard;

（ 6) During the compounding and curing process, part of the adhesive penetrates into the film. The toughness (impact resistance) of the substrate is reduced due to the penetration of the adhesive, and the brittleness is increased;

（ 7) After cooling and placing the plastic composite packaging bag, the heat sealing strength increases, and there is also a tendency to become brittle.

Solution:

（ 1) According to the heat sealing characteristics of the inner sealing layer material, select the appropriate processing temperature, pressure and heat sealing time;

（ 2) Improve the surface condition of the upper heat sealing knife to make the surface of the sealing device flat;

（ 3) The polytetrafluoroethylene cloth is well covered;

（ 4) Select silicone rubber pads with appropriate hardness.

3. The outline of the heat-sealed surface is unclear

Reason:

（ 1) Short cooling time;

（ 2) Poor contact with the cooling plate;

（ 3) The edge melts due to the heating of the silicone rubber pad;

（ 4) The longitudinal heat sealing force is uneven;

（ 5) The edge of the heat sealing knife is uneven and dull.

Solution:

（ 1) Adjust the cooling time;

（ 2) Adjust the cooling plate;

（ 3) Replace or adjust the heat sealing knife;

（ 4) Prevent edge melting caused by overheating of the silicone rubber pad.

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