Use raw materials and recipes:
I. Starch (wheat starch, potato starch or potato starch):
Different starches are used when producing and using the production line starch adhesive, and the adhesive has different transparency, adhesive strength, viscosity, gelatinization temperature, and the like. As long as we have a good understanding of the properties of various types of starch and the role of other chemical raw materials in the production of adhesives, a reasonable adjustment formula can be used to make an ideal adhesive. Under the same conditions, in order to increase the speed, wheat starch and tapioca starch with low gelatinization temperature can be selected; in order to improve the bonding strength, tapioca starch and potato starch with strong adhesion can be selected. For different starch physicochemical indexes and relevant data, please refer to the previous chapter “Adhesives used in single unit (raw glue) raw material and auxiliary material ratio and production processâ€. The amount of starch raw material used can be appropriately changed according to the specific requirements of the bonding target, such as :
1. Single-faced corrugated board production requires less adhesives, and the amount of starch is: 150-170kg/ton.
In the production of 2,3 three-layer corrugated board, the single-sided corrugated paperboard is compounded with the surface paper, and the adhesive requirement is slightly higher. The amount of starch is: 170-200kg/ton of glue.
3, 3 five-layer, seven-layer corrugated board production in the corrugated cardboard and face paper composite. The requirements for adhesives are relatively high. The amount of starch used is: 200-300 kg/ton of glue.
Second, automatic line dedicated desiccant (referred to as raw desiccant):
Automatic line special desiccant in the adhesive production process, as long as the amount of appropriate, not only to speed up the adhesive film speed, shorten the carton drying time, but also to improve cardboard drying speed, hardness, bond strength of about 20%, thickness increase 0.1- 1mm, etc.; with 5kg per ton of glue, can reduce the amount of starch about 20% or reduce the weight of corrugated board paper 10-20g/m2, the performance indicators are better than the national export standards. The amount of desiccant for the automatic line is less than 3kg per ton of glue in the adhesive. It should not be effective, and the amount of glue per ton is higher than 10kg, and it is easy to produce cardboard brittleness. So we must strictly control the proportion of placement. The normal dosage standard is 5-8kg/ton glue.
Third, pasting agent:
Industrial caustic soda (NaOH, this technology requires more than 96% of the content), the amount of caustic soda to be added to the starch liquid, the carrier body after mixing and mixing evenly, the adhesive viscosity adjusted. Under the same conditions, the amount of caustic soda is large, the viscosity is high, and the binder does not produce precipitation layering phenomenon during storage; the amount of caustic soda is small and the viscosity is low. The amount of caustic soda should be observed from the actual, adjusted according to the viscosity requirements.
Fourth, crosslinker:
The binder is added with borax or boric acid, which can make short-chain starch with its hydroxyl or hydroxyl and boron atoms to form a complex, through these irregular cross-links, forming a network structure, with cross-linked thickening effect, is conducive to Improve the initial viscosity and speed up the drying, but also play a role in anti-corrosion, anti-seepage. The amount of borax is adjusted according to the corrugated paper and face paper used in the production of corrugated board. The quality of the paper is poor, and the amount of borax is appropriately increased. The quality of the paper is good, especially the imported sizing paper, and the amount of borax may be reduced or reduced appropriately.
Fifth, water resistance enhancer
Water resistance enhancer is an additive used in the production of water resistant paper products such as coated paper, white paperboard, offset paper, boxboard, etc. It is added to papermaking pulp or carton starch adhesive to increase the wet and dry strength of paper and carton, and water resistance. Sex, prevent paper from falling off, etc.; use 5-10kg per ton of glue, no open glue in cardboard at room temperature for 12-72 hours, and no deformation of corrugated; directly add water resistance enhancer to pulp or starch, mix, 20 It can be used in minutes. Under the condition of better than the original performance index, it can reduce the amount of starch and the weight of paper used in corrugated board.
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