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How to prevent curling of paper-plastic composite woven bags

Date:2019-09-01 Click:
In daily use, if the paper-plastic composite bag products are improperly stacked or used in a high-temperature environment, it is easy to cause the corners of the paper-plastic composite woven bag to curl. How to prevent the curling problem of the paper-plastic composite woven bag?
1. Adopt new technology
2. Control the hot press working temperature
3. Control the humidity of the production environment
When the water content in the outside air is greater than the production environment, a large amount of outside air with a high water content is introduced, so that the relative humidity of the production workshop is increased, resulting in prolonged moisture absorption of the paper-plastic composite product, and increased shrinkage tension of the film surface, causing curling.
According to the moisture content of the paper equivalent to the equilibrium moisture when the relative humidity is 50-60%, the humidity of the production workshop is controlled at 60%. When the relative humidity is low, water can be sprayed to the ground to moisturize. When the relative humidity is high, the hot air around the laminator can be increased to dry. The difference in humidity during production cannot exceed 10%.
4. Control the operating tension
In this production process, the BOPP film prints are respectively pulled by the power generated by the thermocompression mechanism, and are separated from the separation mechanism and the conveyor belt. The paper-plastic composite woven bag product is pulled by the power of the winder mechanism, and is separated from the hot rolling work interface. .
In order to ensure that the film is not forced to stretch, the tension control of the BOPP film discharge shaft should be gradually relaxed, and the discharge shaft and the shaft seat, the flattening of each road, the surface of the adjustment roller and the lubrication are well lubricated.
5. Take the necessary protective measures
(1) There should be a certain storage period before the division
The firm fit of the paper-plastic composite bag woven bag factory is not caused by the fact that it has just left the thermocompression bonding mechanism, but after the effective curing of the adhesive and the mutual adaptation of the BOPP film and the paper stress, no more than 24 hours are reserved. After the storage and premature division, the shrinkage reaction of the BOPP film is increased, and the curl is easily generated.
(2) Moisture-proof of semi-finished products of paper-plastic composite bags
The residual temperature of the semi-finished product of the paper-plastic composite bag just emerging from the laminating machine is relatively high. When the hot paper-plastic composite semi-finished product dissipates heat to the outside, it will absorb the external cold air to cool down, and this cooling will cause an increase in humidity. If the semi-finished product is placed directly on the ground, it is easier to make the paper absorb moisture and produce a split curl.
 
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