Third, natural resin adhesive material
source:
Natural resin binders are mainly derived from certain tree species, made of resin material that is cut off after the bark is cut.
Features:
This material is mainly used as an adhesion promoter for hot stamping.
Commonly used adhesion promoters include rosin powder and shellac.
Fourth, cellulose adhesive materials
Cellulosic binders basically consist of a fiber-modified solution. Can bond paper, cardboard, cover, etc., have good adhesive properties.
(1) Carboxymethyl cellulose binder.
source:
Carboxymethyl cellulose is an ether of cellulose and glycolic acid, also known as paper wool paste. This adhesive material is a process that crushes paper hair by chemical treatment.
Features:
After drying, the carboxymethylcellulose adhesive has stronger bonding strength than the flour paste, good elasticity of the film, colorless and transparent, no fear of biting by insects, no deterioration, no precipitation, and long storage time. Its viscosity can be freely adjusted, and can be mixed with paste or polyvinyl alcohol to obtain a good bonding effect.
The drying speed of carboxymethyl cellulose binder is slower than that of starch-based adhesives, and the adhesive force at the beginning of the bonding is insufficient. As the moisture evaporates and dries, the adhesive strength gradually becomes stronger, and when it is completely dried, it is bonded. Good strength. Therefore, the pages or covers that are stuck during processing cannot be moved to avoid stickiness or looseness.
Usage:
Can replace the use of starch-based adhesive materials, such as bonding cover, paper, liner and so on.
(2) Methylcellulose binder.
Methyl cellulose is an ether of cellulose and methanol. The colloid is a white or beige sheet that dissolves in cold water. The surface tension decreases when dissolved. The glue will condense at 50°C, but it will recover after cooling. The solubility. Non-toxic, very good anti-bacterial, and also very stable to ultraviolet light.
In the post-printing process, methyl cellulose is often used to bond the cover and the like, and the glue is easy to apply, but it sometimes foams.
Some tributyl phosphate can be added to prevent blistering.
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