Corrugated board production line starch adhesive formula and technology

The single-faced corrugating machine and corrugated board production line is still based on the two-step method currently used to produce finished product starch adhesive, and the raw material formulation, proportion of materials and production process are appropriately improved. The specific raw material used, the ratio and the manufacturing method are as follows.

Use raw materials and recipes:

I. Starch (wheat starch, potato starch or potato starch):

In the production and use of the production line starch adhesive, different starches are used, 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 related data, refer to the starch raw materials in the previous chapter “Adhesives (Mixed Gum) Used for Single Units, Raw and Auxiliary Proportioning, and Production Processes”.

The amount of starch can be appropriately changed according to the specific requirements of the adhesive object, 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, the adhesive requirement is slightly higher, and 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 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 the 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 added to the starch liquid, the carrier body after mixing and mixing evenly, the viscosity of the adhesive to adjust. Under the same conditions, the amount of caustic soda is large, the viscosity is high, and the binder does not produce the phenomenon of sedimentation and stratification 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, especially the imported sizing paper, may not be used or the amount of borax may be appropriately reduced.

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 improve 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, do not open the glue in cardboard at normal temperature for 12-72 hours, and the corrugated will not be deformed; directly add the water-resistant enhancer to the slurry or starch gum, stirring 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.

Formula and production process: (Unit: kg)

Raw material ratio 1:3.5 Starch: Finished glue 1:4 Starch: Finished glue 1:5 Starch: Finished glue 1:6 Starch: Finished glue 1:7 Starch: Finished glue carrier water 200370200200220310350 Starch 25502525203038 Automatic line special desiccant 4-66 -84-54-54-55-75-7 caustic soda 45.5-105-6.55.5-72-45-65-5.5 main body water 400550400400350550550 starch 225250175125130150125 borax 2.5-43-52.5-42.8-42.5-43-54- 6

Process flow one:

Carrier (water + starch + automatic drying agent + caustic soda) + body (water + starch + borax)
1. Add the raw materials on the kettle to the stirred tank in order and react for 20-30 minutes.
2. Add the raw material of the next kettle sequentially to the stirred tank and stir for 10-20 minutes.
3. Slowly add the gel on the kettle to the next kettle and stir for 20-40 minutes.

Process II:

According to the special circumstances of some enterprises, in the absence of the main body and carrier production equipment, an agitator can be used for production. According to the formula in the above table, the carrier is processed first in the reaction kettle in order, and then the moisture in the body is divided into two parts; the water and starch with the same weight as the starch are first taken out, and the borax is evenly mixed for use. The remaining water is added into the reaction kettle and stirred uniformly. After that, the standby mixture was added to the reactor and stirred for thirty minutes.

Precautions:

1. After adding automatic desiccant, the viscosity will be properly reduced. During the production process, attention should be paid to adjusting the amount of caustic soda. The caustic soda is used to control the viscosity. The amount of caustic soda is increased by using too much glue, and the amount of caustic soda is too thick to reduce the amount of caustic soda.

2. The viscosity control of single-sided machine and three-layer line is about 20-50 seconds.

3, 5 and 7 layers of raw rubber on the machine when used in the viscosity control: 50-100 seconds, special circumstances, according to the requirements to adjust the adhesive viscosity.

4, in the three-layer, five-story automatic production of corrugated cardboard, such as the phenomenon of degumming and cardboard 1-2cm on both sides of the bond is not strong, please check 1 sizing amount is too small; 2 adhesive viscosity is too low; 3 composite Both sides of the roller are too hot.

5, the production companies can also be used according to the original production line rayon process to add a special automatic desiccant raw rubber, in the raw rubber production process, the raw rubber dedicated desiccant before adding caustic soda directly into the carrier, stirring for 10-20 minutes, then Then according to the original process can be produced. The raw rubber special desiccant is acidic. When the rubber is produced, the amount of caustic soda in the raw rubber process formula should be properly increased. The ton of raw starch is about 0.5 kg of caustic soda per ton of raw starch.

Reproduced from: lanxinya.com