Brief introduction to the advantages of the hottes

2022-08-08
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Brief introduction to the advantages of paper plastic composite products

paper plastic composite products require firm bonding, clean, flat, smooth surface, no blistering, curling, no film loss, film release, etc. There are many factors affecting the composite quality, both objective and subjective. It involves the environmental factors of the operation site (indoor temperature, humidity, dust, etc.), as well as the factors of the product itself (the ink used, the type of paper, the printing method, etc.), and is closely related to the adhesive, film and process conditions used in the paper plastic composite, the operation method, the structure and technical performance of the laminating machine, which requires comprehensive analysis

I. bonding fastness of composites

the factors that affect the bonding fastness of composites are: the bonding strength of the glue itself, the affinity between the glue and the film, paper and ink layer, the condition of the glue layer, and the operating process conditions

1. The adhesive force of glue depends on the raw material and production process formula of glue and the solid content of laminating glue. Some products have good adhesion after compounding, and after being put for a period of time, the film is separated from the paper, which is separated by gently peeling it with your hand. Even scratch the film surface with your fingernail, and the film is separated from the paper surface at the crease, or fold the composite to the film surface, and the film is separated from the paper surface at the crease, or curl the composite to the film surface, which also causes the film to be separated from the paper surface. These phenomena prove that the adhesive force fails due to the influence of external natural conditions

2. The influence of the affinity between glue and membrane on the composite fastness

the chemical structure of polypropylene membrane used for composite has no active genes, which is a non-polar substance with poor affinity to glue, causing difficulties in surface adhesion. Therefore, corona treatment should be carried out on the film to make its surface products unsaturated double bond and carbon base, so that its surface energy has active genes. As a result, the surface roughness of the film is increased, which is conducive to the coating of glue. After corona treatment, the properties of the membrane surface change from non-polar substances to polar substances, which is conducive to improving the affinity between the adhesive and the membrane. However, there is a time limit for the film after corona treatment, and it will subside after a long time. The information is introduced as 6 months. The surface tension of the failed film decreased, and the data introduction was less than 39 dyne/cm2. How to identify the corona inside the membrane and whether the corona treatment with good ventilation fails? Here are two methods

(1) write or scribe on the film surface with a fountain pen, and the side easy to be stained with ink is the corona treatment surface. If the water does not shrink or form beads, and it is not easy to wipe off, it indicates that the corona treatment surface has not failed

(2) use 38mn/m surface tension indicator: 54 grams of formamide and 46 grams of ethylene glycol ether, and then test. If the indicator does not shrink within two seconds, it is considered that the corona treatment is qualified

3. The influence of the affinity between glue and paper on the composite fastness

paper is a porous material interwoven with plant fibers. It can fill the holes and improve the water resistance of the paper after sizing to make up for the hollows on the surface. In order to improve the flatness and smoothness of the surface, the paper is coated with a layer of paint, which is made by calendering or super calendering

there are many kinds of paper used for printing, and the printing materials used for laminating generally include white paperboard, coated paper, glass paperboard and other printing materials. Classify them. One is that the paper structure is relatively tight and the surface is relatively flat, such as coated paper and cellophane. The other is paper with loose structure and rough surface, such as whiteboard. Its internal structure is similar to the first type, and its surface condition is similar to the first type. When the adhesive layer and the paper are compressed with this, the composite fastness of the paper with poor surface flatness is poor. The high point of the paper is bonded with glue, while the low-lying part is not bonded with glue, and the glue layer is bonded with the paper in the form of point contact. For paper with high surface flatness, the composite fastness is higher. The adhesive layer is basically combined with the paper surface in the form of point contact, and more adhesive is in contact with the paper surface. For the paper with loose structural adhesive, the paper wool is easy to be taken away by the adhesive layer after stripping. Therefore, in the process of use, the size of the glue should be adjusted according to the paper to fill the uneven surface of the paper and improve the bonding fastness

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