Composite PE film strength is low

A factory production BOPA / PE bags, because of low strength was returned. The two layers of film peeled, wipe with a finger on the PE film, the friction between the two fingers have a smooth feeling. More slippery agent in the film precipitation.

The factory mature temperature thermocouple and parallel to the heating source, from the heat source is only 30 cm to 40 cm, under such control, the heat source will be a long time to stop heating, the actual curing temperature is less than 50 ℃. And the ripening time of the power source heating is less than 16 hours. Adjust the thermocouple position, to extend the aging time, peel strength to meet the requirements.

High content of composite slip agent PE film, we should use a certain resistance to the smooth agent of the adhesive. Film roll into the curing room as soon as possible after the machine, and appropriate to improve the curing temperature. General ester soluble two-component polyurethane adhesive natural aging resistance of slip resistance poor performance.

The friction coefficient increases

A factory production BOPP / VM-PET / PE structure of the film, the winter production has been no problem. June production, the friction coefficient increases, the packaging machine can not be used normally. To natural ripening, membrane volume can not be used.

The product with a thickness of 30μm PE film, the former is a good slip sex. When the cooling roller is not connected to the cold water, the surface of the cooling roll is warm. Film before the film from the oven with the heat is still in the winding film is warm. Although the natural aging on the workshop, the summer high temperature (10 am workshop temperature 30 ℃), the film comes with heat is not easy to distribute, in fact, in the hot state.

The composite film was put under 27 ℃ and 45 ℃ for about 20 hours at 27 ℃. The composite film placed at 45 ℃ showed good slipperiness and slipperiness. The impact of a larger product slippery.

Similar to temperature-sensitive CPPs with a thin thickness, CPP has a coefficient of friction of less than 0.1, but only after natural aging.

Cooked delamination

South of a factory production of preserved eggs packaging bags, sterilization in the food factory 115 ℃ for 30 minutes, sterilization pot above the layers of the bag BOPA layered, ink transferred to the CPP. Color printing factory technical staff that the quality of adhesive, the amount of glue is able to meet product requirements, 50 ℃ ~ 55 ℃ aging 48 hours of aging is also acceptable, the problem is the possibility of a great ink.

The samples were cooked again at 55 ° C for 24 hours and at 121 ° C for 30 minutes without delamination, and all of the uncooked samples cooked together were delaminated. The direct manifestation of this problem is the transfer of ink, which is caused by insufficient maturation. Later, the company's other technical staff to the plant found that the actual curing time of 36 hours or so, the plant process requirements and the actual implementation of the inconsistency.