The use of different adhesives in post-press processing (2)

Second, starch-based adhesive materials

Starch-based binders refer to binders made from starch extracted from seeds, stems, tubers, etc. of plants.

(1) gluten slurry

source:

The gluten slurry is the gluten slurry obtained by kneading the glutinous rice flour and the wheat flour (flour) with water or the gluten pulp obtained by fermenting the flour paste.

performance:

The gluten slurry binder has the advantages of fine texture and pureness.

Usage:

It is commonly used for bonding paper and paper on adhesive paper reels, as well as wrapping corners for book covers, book letters, and book blocks.

(2) flour paste

source:

The main ingredient of the flour paste is starch. Stapling paste is mainly wheat flour paste, glutinous rice flour paste.

Features:

There is a certain degree of cohesive strength, enough to bond paper, cardboard, cardboard, woven fabric, etc., and can be modulated into different viscosities according to the requirements of the adhered object. However, the sticky paste of the flour paste sticks easily after being damped, and when the temperature is high and the humidity is high, the flour paste is easily fermented, enzymes are generated, and corruption occurs. The paste after fermentation has a sour smell, surface blisters, long green hair, and the viscosity is greatly reduced, affecting the normal bonding process.

Usage:

The adhesive strength of flour paste is not high, suitable for paper, cardboard and paper and paper paste, can also be used to stick the general cover, ring lining, pulp back and other processing, not bonding bonded materials with high strength requirements.

Such as:

Single and double pages, liners, paperbacks, paperback covers, paperbacks, etc.

(3) Dextrin

source:

Dextrin is a kind of binder made from starch by acid or heat treatment or by the action of starch mold.

Features:

Compared with starch, it has high viscosity, fast drying, good transparency, and it is not easy to put away for a long time. Dextrin is easily soluble in hot water, slightly soluble in cold water, and has good adhesive properties.

Dextrin and paste have the same fluidity and penetration ability, can be infiltrated, diffused, and have good bonding effect after being wetted. Dextrin has many advantages, and there are many types of packaging, ranging from small to large, easy to use. very popular.

Usage:

Suitable for bonding paper, fabrics and other absorbent objects. It is worth mentioning that the use of dextrins in the confrontation of cardboard is quite extensive.

Starch-based binders can also be used in combination with other synthetic resin binders to change their properties and achieve better bonding results.