Packaging aging bad quality problems occur frequently
Release time: 2020 / 06 / 22 10:33:55 reading volume: 1281 times
one The strength of packing bag is low
Use your fingers to peel off the membrane PE After wiping on the film, the friction between the two fingers has a smooth feeling. In the film, there are more dispersants.
The adhesive used in this product is resistant to the smooth agent PU-1850 。
The temperature measuring thermocouple in the curing room of the factory is parallel to the heating source, and is only away from the heat source 30 Cm ～ 40 Under such control, the heat source will stop heating for a long time, and the actual curing temperature will not reach fifty C. And turn on the power heating aging time is insufficient sixteen Hours.
By adjusting the position of thermocouple and prolonging the aging time, the peeling strength can meet the requirements.
High content of compound smooth agent PE When the film is used, the adhesive with certain resistance to the smooth agent should be selected. After the film coil is off the machine, enter the curing room as soon as possible and raise the curing temperature appropriately. Generally, ester soluble two-component polyurethane adhesive has poor performance.
two 、 The friction coefficient increases
BOPP/VM-PET/PE The structure of the roll film, winter production has been no problem. six Month production, friction coefficient increased, packaging machine can not be used normally. The film can not be used after natural aging.
This product uses thirty μ thick PE The film has good smoothness before compounding. The surface of the cooling roller is warm because it is not cold water. Before winding, the heat of the film from the oven is still there, and the film is also warm when winding. Although it is placed in the workshop for natural ripening, the summer temperature is high (in the morning) 10 Hourly workshop temperature thirty The heat carried by the film coil is not easy to dissipate, which is actually in a hot state.
Remove the composite film on site and place it in the twenty-seven ℃、 forty-five The temperature is about 20 Hours, twenty-seven It has good smoothness when placed at ℃, forty-five The results show that the composite film placed at ℃ is astringent, and the smoothness is obviously reduced. The temperature has a great influence on the smoothness of the product.
With some thin transparency CPP The sensitivity to temperature is similar to that before recombination CPP The friction coefficient is lower than zero point one But it can only ripen naturally after compounding.
three 、 Delamination cooking
Marinated egg bags In the food factory one hundred and fifteen Sterilization at ℃ 30 Minutes later, several layers of bags appear on the top of the sterilization pot BOPA Layered, Huai ink transfer to CPP Go ahead.
The technicians think that the quality and quantity of adhesive can meet the requirements of the product, fifty ℃～ fifty-five C. ripening forty-eight Hours of aging is also in line with the requirements, the problem in the ink is very likely.
Put the sample bag again fifty-five C. ripening twenty-four Hours, one hundred and twenty-one C cooking 30 There was no delamination phenomenon in one minute, but all the samples which had not been cooked together appeared delamination.
The direct performance of the problem is ink transfer, and the cause of this phenomenon is not mature enough.