Analysis of production methods of paper-plastic composite bags in China
As we all know, packaging bags are indispensable packaging products in modern production and life, but the performance of different types of packaging bags is often different.
In the field of packaging bags, zui is popular and the most outstanding non-paper-plastic composite bag.
The use of paper-plastic composite bags has brought us great convenience, however, if consumers have a certain understanding of the composite production process of the products, they can be helped to choose the most suitable packaging bag products to the greatest extent.
However, it is often difficult for consumers to distinguish between good and bad.
The following is a detailed introduction to the production methods of paper-plastic composite bags in actual production by experts in Jin Hehai packaging.
1. Dry composite method: dry composite method is also called dry lamination composite. Its technological process is to coat solvent-based adhesive on the basic film, the solvent in the adhesive on the adhesive layer material is completely volatilized through a hot drying channel, and then is compounded with the second layer of substrate by heating and pressing, the compounding in the total amount is not only suitable for compounding between plastic films, but also with plastic films, aluminum foil and paper.
2. Hot melt compounding method: This method is to heat and dissolve the Hot Melt Adhesive into a flowing form, then coat it, and immediately press and stick other films for compounding.
Compared with dry composite and wet composite, it has the advantages of no need of hot drying, broken composite time, energy saving, low cost, and no solvent pollution. Used in paper, plastic and aluminum foil composites.
3. Coating method: This method refers to a method of coating a liquid substance on the surface of the film to make the surface of the film form a close to the film.
It can improve the thermal adhesion, moisture resistance, gas isolation, ultraviolet absorption and antistatic properties of the film.
4. Wet composite method: wet composite method is also called wet lamination composite.
The technological process is as follows: the surface of the first layer of substrate is coated with water-soluble or water-emulsion adhesive, which is extruded and compounded together with the second layer of substrate through a composite device in a wet state, then the solvent is removed by drying in a hot drying tunnel to combine the two substrates.
Here, industry experts suggest that the majority of packaging bag manufacturers have undergone great changes in shape and quality when producing paper-plastic composite bags.
The plastic woven bag woven with mixed color flat silk in shape looks more elegant and has a certain stereoscopic impression.
In terms of quality, the quality of today's paper-plastic composite bags is supervised by the state, and the quality has to meet the national unified standards to flow to the market.