Advantages of wireless binding
Used in the process of wireless binding, hardcover book core backing, shell making and book covering, and the cover of paperback books, magazines and manuals. There are the following types of binding glue: starch paste adhesive (starch paste, dextrin), animal glue (bone glue), cellulose binder, synthetic resin binder (polyvinyl acetate, polyvinyl alcohol, hot melt adhesive) Wait.
1. starch paste adhesive
(L) Starch paste. Starch paste (also called paste) for book binding is mainly made from starch extracted from wheat, corn, potato and rice, and the starch (5% to 12%) and water (95% to 88%) are heated to 80 ° C Made from above. Master the correct modulation temperature, the paste will have a strong bonding force. When the temperature is too low, the starch cannot be completely gelatinized, the bonding strength is weak and it is not easy to use; when the temperature is high, the paste will gradually become a glass-like transparent body, and the temperature will continue to decrease, which will quickly reduce the viscosity of the paste Knot force.
Paste is a commonly used adhesive material for binding. It is widely used for the bonding of paper, bitch of fabric and paper, adhesive cover, ring lining, pulp back, etc. It is not suitable to bond the processing parts that require high bonding strength. The paste material has a wide range of sources, simple production, tasteless, non-toxic, low cost, and easy to use. The paste has a certain adhesion fastness, but it is easy to absorb water and deliquesce, which makes the adherend fall off. Paste is easy to ferment, moldy and spoilage, in order to prevent spoilage, a small amount of formaldehyde is often added, so it is best to use it now.
(2) Dextrin. The raw material of dextrin is still mainly starch. Compared with paste, it has strong viscosity, quick drying and good transparency. It can be placed for a long time without deterioration, and it is widely used.
Dextrin is not only soluble in hot water, but also soluble in cold water to make various concentrations of binders. Generally, a dextrin aqueous solution with a concentration of 45% to 50% is used as a binder for paper and fabrics.
After dextrin is dried, the film layer is relatively brittle, and the adhesion is not strong. For example, if dextrin sticks to lacquer wood and paper, it can be easily peeled off from the dextrin layer after drying. To this end, 1% to 2% of glycerin can be added to improve the elasticity of the film; adding 0.65% to 1% of borax can improve the adhesion fastness of dextrin.
2. Bone glue
The main component of bone glue is gelatin prion protein, low purity is called bone glue or hide glue, and high purity is called gelatin. Bone glue is a solid, purulent lump at room temperature. It cannot be dissolved in cold water, but it can absorb water and swell. The animal bones, skins, and horns are used as raw materials to extract glue protein with adhesiveness.
Bone glue has high bonding strength and good shaping. Due to its low water content and fast drying speed, it is used to bond hardcover book shells, book back cloth, book back paper, and wall cloth. Bone glue is resistant to water for a long time. It will swell the glue layer when exposed to water and lose its bonding strength. If the water content exceeds 20%, it will spoil and deteriorate.
When using bone glue, you should first soak the water in the proportion of 1 part of the glue and 2 parts of the water for about 10 hours. When using it, heat it to 70 to 75 by using a bath heat method (it will melt into a liquid, and the liquid can flow normally Use. When the heating temperature exceeds 100 ℃, the glue is easy to age and deteriorate. Because animal glue has a wide range of uses and limited sources, it has been gradually replaced by synthetic glue.
Gelatin is rarely used in book binding, because of its high price, it is generally used in high-end picture books or special processing.
3. Cellulose adhesive
Cellulose adhesive is also known as paper wool paste, without grain paste. The cellulose adhesive used in book binding is carboxymethyl cellulose adhesive. Paper wool pastes are sold without commodities, most of which are processed by the printing house with the cut edges. Generally, it is made by crushing the paper wool, by chemical method, alkali land, ether ratio, and then adding water through neutralization treatment. Because of its wide source of raw materials, it has been used in the printing industry.
The paper wool paste has good adhesive properties after drying, good elasticity of the film, stable storage performance, no moldy deterioration, no fear of rat biting insects, and is a substitute for starch paste.
Paper wool paste can be used to bond inserts, interleaf pages, package covers, etc. The drying speed is slower than starch paste. If mixed with polyvinyl alcohol, the effect is better.
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