As more and more enterprises use high-speed
automatic packing machine, in the high speed automatic packaging process of the flexible packaging film of the torn bags, cracking, delaminating, heat sealing, the sealing quality problems such as pollution gradually become enterprise need to focus on control process problems.
flexible packaging enterprises in the production of high speed automatic
packaging machine using a reel of film, should pay attention to the following:
1, the roll of film layers' material requirements
because of the high speed
automatic packaging machine equipment structure is different from other bag making machine, its pressure on only two wheels or article hot-pressing extrusion force each other to achieve heat sealing, and no cooling device, printing film layer is in direct contact heat sealing device, without the protection of the insulation cloth.
Therefore, high-speed printing each layer material choice is particularly important.
Shall comply with the requirements within the table below:
2, the other properties must comply with:
1)
Film thickness balance
plastic film thickness, average thickness and thickness tolerance, in the final analysis is the thickness of the diaphragm.
In the production process should control the film thickness uniformity, otherwise produced products, it is not a good product, good product should be vertical and horizontal to the thickness of the equilibrium.
Because of the different types of thin film use effect is different, the average thickness and thickness tolerance is different also.
About general high speed automatic packaging film thickness difference is not more than 15 um.
2)
Thin film optical properties
refers to the haze, transparency, light transmittance of thin films.
as a result, the roll of film for the choice of masterbatch additives and adding quantity has special requirements and control, and has the good transparency, but also want to consider the open sex and smooth degree of membrane, open dose for film rolling, winding, not occur between film adhesion for the principle.
If the amount too much will affect film haze.
Pervious to light the general should be above 92%.
3)
Friction coefficient
the coefficient of friction can be divided into static friction and dynamic friction system.
Automatic packaging drum products, in addition to the normal condition testing friction coefficient, should also be testing film and the friction coefficient of stainless steel plate, because of the heat sealing layer of automatic packaging film is in direct contact with packaging automatic molding machine, the friction coefficient should be less than 0.
4u。
4)
Add dose
in general should be controlled within 300 ~ 500 PPM, too little influence openings, etc. The function of the membrane, too much will destroy the composite strength.
And to prevent the additives in the process of using a large number of migration or infiltration.
Add dose in 500 ~ 800 parts per million, should be used carefully, the adding dosages greater than 800 PPM, generally do not use.
5)
Composite membrane of synchronous and asynchronous contraction
asynchronous contraction are embodied in the change of material of curling and warping, asynchronous contraction has bag opening & other;
Curl inward & throughout;
Or & other
Outward curl & throughout;
Two kinds of forms, this state shows that the composite film in addition to the synchronous contraction still exist inside asynchronous contraction (
The thermal stress or in a different direction and the size of shrinkage)
。
So when to buy film, must be in the same condition, for all kinds of composite materials for thermal (
Hot and humid)
Longitudinal and transverse shrinkage test, and the difference of the two can't difference too much, about 0.
5% better.
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