Cause of problem: 

1. the thickness of the composite film is inconsistent;

2. the heat sealing temperature is too high or the heat sealing time is too long;

3. in the longitudinal heat sealing part, the running track of the composite film is not straight;

4. insufficient cooling;

5.  the curing time is not enough;

6. The heat resistance of surface substrate film is poor;

7. Improper tension matching control of the composite substrate in the composite process leads to residual stress after ripening and shaping, especially when the thickness of the composite film is thinner, such faults are more likely to occur.

Solutions :

1.  Adjust the tension of the floating roller;

2.  choose the inner sealing base material with low temperature heat sealing;

3. Adjust the heat sealing temperature to the appropriate temperature;

4. Full cooling;

5.  Fully mature;

6.  Re-select the surface substrate film;

7. adjust the tension of each part of the composite processing equipment, try to make the two kinds of composite base material shrinkage rate equal.

When the bag-making machine completes the bag-making production of the day, the operator must stop the machine for cleaning, so as to ensure the hygiene of the working environment and lay a foundation for the next startup production. The following is how to clean the three-side sealing bag-making machine correctly after stopping the machine.

1. Turn off the power supply of the three-side sealing bag making machine.
2. Package all products in line with the process requirements of the order, mark them one by one, and then handle the warehousing procedures.
3, for the waste produced in the process of bag making, confirm and verify, according to the amount of book, and put in the specified position.
4. Tidy up the work tools used in the bag-making process and keep them reasonably.
5. Fill in all kinds of bag-making quality records, and timely report to the workshop management.
6. Clean up the surrounding sanitation of the three-side sealing bag making machine, and do the corresponding maintenance and hygiene.
7. Clean the floor of the workshop to ensure a clean environment for the next operation.

Bag making machine is a machine that produces all kinds of plastic bags or bags of other materials. Processing scope is a variety of specifications, sizes of plastic or other materials of the packaging bag. Generally speaking, plastic bags are the main products.

The main reason for the brittle fracture of the sealing mouth in the bag-making process is:

1. The heat seal is too high.

2. Too much pressure.

3. The heat sealing time is too long.

4. The edge of the upper sealing strip is too sharp or the PTFE cover is damaged.

5, the bottom seal is the ideal choice of silicone rubber.

6, in the curing and curing process, part of the adhesive into the film. Due to the penetration of adhesive, toughness of matrix decreases and brittleness increases.

7, plastic composite bag cooling and placement, heat sealing strength increases, but also a brittle trend.

Countermeasures:

1. According to the sealing performance of the inner sealing material, the appropriate processing temperature, pressure and heat sealing time of the bag-making machine are selected.

2. Improve the surface state of the upper heat sealing tool to make the sealing surface smooth.

3. Ptfe is completely coated.

4, choose the appropriate silicone rubber pad hardness.

In the process of bag making, due to poor heat sealing, the object will leak or deteriorate. In this case, it is mainly due to poor thermal sealing of the film or improper use of resin in the sealing.
Countermeasures: bag making machine adopts good antifouling heat sealing film. Because LDPE has a moderate anti-pollution heat seal. EVA has good anti-pollution heat sealing property when VA content is large, LDPE also has good anti-pollution heat sealing property, ionic resin and metallocene polymer have excellent anti-pollution heat sealing property.

In the use of three-side sealing bag making machine sealing is easy to open, what is the reason for this phenomenon?
1. The heat sealing temperature is not enough
When the thickness of the bag is 80 ~ 90μm, the heat sealing temperature should reach 170℃ ~ 180℃. The thickness of the composite bag made of PE is 85 ~ 100μm, and the temperature should be controlled at 180 ~ 200℃.
2. The heat sealing speed is too fast
Due to poor sealing, it may be because the speed of heat sealing is too fast, and the sealing part cannot transfer heat to the cold pressing place for cooling treatment, so as to not meet the quality requirements of heat sealing.
3, the quality of heat sealing film has problems
Sealing is easy to open and the quality of the heat sealing film. If the composite corona treatment is not uniform and happens to be at the seal, it will not be able to seal.
4. The pressure of cold pressure rubber wheel is not suitable
The cold pressure rubber wheel has two pressure, the pressure between them should be moderate, as long as the pressure clamping spring on the line