In the process of making cardboard, often hesitate in the amount of glue. If the amount of glue is too small, it is easy to degumming and it is difficult to ensure the quality and quality of the product. If the amount of glue is too large, the gap between the glues is adjusted to increase the cost and reduce the quality and damage resistance of the product. How to grasp the amount of glue, both to reduce costs and improve quality? Let's approach the gluing process and understand the optimal solution.
Hazard of large amount of glue
Under normal circumstances, employees control the amount of paste in the regular production process, and are willing to adjust the glue gap to be larger, so that it will not degumming, but its harm is also great:
A. The paperboard is soft, easy to squash, and the thickness decreases, resulting in a reduction in the flat compression strength, edge compression strength, and bursting strength of the cardboard.
B. The surface quality of the cardboard is not good, the facial paper is corrugated, the edges are wrinkled, and the inner paper is blistered.
C. Cardboard is prone to warping.
D. Increased temperature baking and reduced vehicle speed.
E. The glue consumption is large, and the cost is increased.
Cost variance calculation:
Based on an average monthly output of 5 million? If the unit consumption of starch increases by 2g / ?, then one year of starch consumption is more: 2g /? × 5 million? × 2800 yuan / ton × 12 months = 336,000 yuan.
Calculate the starch consumption area as the standard square:
Three-storey area × 0.6 + five-storey area × 1 + seven-storey area × 1.5
The consumption of starch in the industry is usually 11-13g / ?. The consumption of starch is mainly determined by the following four aspects:
1) The width of the glue line accounts for 50%;
2) Glue wheel throwing glue accounts for 30%;
3) Glue agglomeration accounts for 10%;
4) The solid content accounts for 10%.
Glue gap control
Under different materials and different speed conditions, the gap between the paste wheel and the paste is automatically adjusted through the process control to achieve the minimum glue thickness under the corresponding material.
The weight of base paper below 120g /? Corresponds to the glue gap of 0.8-1mm;
120-170g /? Base paper weight corresponds to 1-1.2mm of glue gap;
The weight of the base paper above 170g /? Corresponds to the glue gap of 1.2-1.5mm.
Key points of implementation:
1. Whether the actual gap between paste wheel and paste wheel is consistent with the display gap of the device.
2. Whether the setting parameters of different materials and the appropriate thickness of the glue gap are feasible.
3. Whether the parameter setting of the relationship between the gap between the paste wheel and the paste wheel and the thickness of the glue is feasible at different speeds of the equipment and the same glue viscosity.
Minimum glue thickness
Mainly for the quality of cardboard, the smaller the thickness, the smaller the quality of the cardboard is damaged; The second is for the consumption of glue, the smaller the thickness, the smaller the consumption of glue. Therefore, on the premise of ensuring effective bonding, the smaller the amount of glue, the better.
Glue line width test
Glue
The structural difference of glue-gluing:
Glue Wheel Glue-Traditional Mode
Glue Wheel Glue-Vertical Mode
Automatic control of paste baffle
Glue wheel baffle (single-sided machine, gluing machine) automatically adjusts the position of the gluing wheel baffle according to the control of the wet-end changing process to reduce the effect of glue overflow on production quality.
The key points of implementation: the real-time control of single-sided machine, glue machine and glue wheel baffle tracking tissue. The automatic control of the glue wheel baffle of the glue machine can increase the breathability and service life of the large cotton belt by 20%, and at the same time reduce the impact of the rubber block on the cotton belt on the quality of the cardboard. Through automatic control of paste baffle, it can improve the quality of cardboard while reducing cost and labor intensity.
Calculation of the efficiency of the baffle:
1. Reduce the shoveling time, calculated by shoveling twice a day, each time for 10 minutes, the production capacity increases by 20 minutes × 150 meters / minute = 3000 meters, and each shift increases the production capacity by 3%.
2. The life of the cotton belt is calculated based on a cotton belt of 100,000 yuan, and it can be changed every year to save at least 20,000 yuan.
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