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1. Effect of the viscosity of starch adhesive on the speed of the vehicle
After the starch adhesive is prepared, due to the influence of the environment, the viscosity will undergo a certain change, which will inevitably affect the vehicle speed during use.
The speed of the vehicle affects the amount of glue applied and the bonding effect. Therefore, we need to control the speed of the vehicle based on the viscosity of the starch adhesive so as to facilitate the use of the adhesive.
If the speed is too fast, it can easily cause uneven coating, and the amount of glue is insufficient, which affects the effect of adhesion. When the speed is too slow, the adhesive penetrates into the layers of the board and causes a high water content of the box, which directly affects the resistance of the box. Compressive strength and other physical properties.
2. The effect of glue volume control on the bonding quality
During the production process, the replacement of the product, the quality of the raw materials, the speed of the vehicle, and the temperature of the hot plate will affect the use of the adhesive. If the actual amount of glue is not controlled, the effect on the bonding quality is Can imagine.
(1) The same amount of paper, due to the different pulp and filler used in papermaking, causes intrinsic tightness and penetrability. Pulp thick, small tightness of the paper, the general penetration, the amount of glue should not be too large; paper pulp, tightness of the paper, the penetration is poor, the glue should not be too small.
(2) The speed of the vehicle causes changes in the amount of glue to be applied, and there are also certain requirements for the amount of glue applied.
(3) The hot plate temperature also has an effect that can not be ignored on the amount of glue and the speed of the vehicle.
3, speed: the impact of the hot plate temperature on the adhesive bonding effect
(1) The adhesive quality is stable and the amount of glue applied is constant. When the vehicle speed is less than 400 rpm, the adhesive effect decreases as the temperature of the hot plate increases. example:
Hot plate average temperature (°C) 111.6 113 125 131
Bonding strength (N/cm2) 6.7 6.65 5.2 4.4
(2) The quality of the adhesive is stable and the amount of glue applied is constant. When the vehicle speed is above 500 rpm, the higher the average temperature of the hot plate, the better the adhesive effect. The following table:
Hot plate average temperature (°C) 108.6 131 134 143
Bonding strength (N/cm2) 4.75 5.28 7.6 7.4
Get such an understanding in practice, as shown below:
1 Hot plate average temperature: Below 115°C Velocity and viscosity
2 hot plate average temperature: above 120 °C
Speed
Viscosity and strength
Therefore, in actual production, we must adjust the speed according to the temperature of the hot plate to facilitate the bonding effect.
These are just some of the superficial understandings that we have gradually explored in our production practice. We need to further improve and further verify each carton production colleague. (Text / He Guangyan)
(b) Use of starch binders