1. Mixer: Speed ​​60-80 rpm.
2. When the adhesive viscosity is too low (20 seconds or less) and the adhesive is also a translucent gel, it is necessary to use a mixture of a higher viscosity adhesive. It is also possible to add an appropriate amount of starch paste (starch + water) to the adhesive and mix it evenly. The adhesive made by this method should not be stored for a long time.
3. When the viscosity of the adhesive is too high, the phenomenon of glue rejection or the glue machine can not be used, (the normal use of the adhesive viscosity has a certain relationship with the speed of the glue machine, the speed is slow, the viscosity can be appropriately larger, the speed is faster, and the viscosity is appropriately smaller. The principle of not using the glue to work normally is to add an appropriate amount of oxidizing agent to dilute and then oxidize again. Take care not to add water to dilute, so as to avoid degumming and squeezing.
4. In order to prevent the viscosity of the adhesive from being too high or too low, it is better to use a binder with a higher viscosity first, and not to add borax or boric acid prematurely. The binder to be added is added with caustic soda. Reaction for 2 hours or more, measure its viscosity, such as in about 70 seconds, can add appropriate amount of water thinning, to about 60 seconds, then add borax and then stabilized in 30 minutes to use.
5. When the adhesive is stored, it is best to store it in a sealed manner. Do not expose it to the air to avoid skinning.
6. The winter temperature is better than 8t, otherwise the reaction time is too long, the operation is inconvenient, and the quality of the adhesive is affected.
7. In adhesive workshops, the winter temperature must not fall below -5 cC.
8. When sizing, the amount of glue used is controlled by (single-tile double-sided sizing) 80-120g/m. It is better to de-adhesive when too little, and too much drying speed is slow.
9. In batch production, a small test must be done for each raw material changed, and the ideal ratio and quantity of the materials used should be observed. When doing a small test, it is best to make 4-5 samples at the same time. Each sample is formulated according to different proportions, so that in a very short time, the best formula for adapting the new raw materials to the ambient temperature and humidity at that time can be observed. Proportions to avoid unnecessary surprises in mass production.
10. In the production of starch binders: the viscosity of the starch binder must be adjusted according to the object used.
1 High-strength corrugated paper, single-faced corrugated board and fine corrugated box-carton board adhesive with a viscosity of approximately 35±10 seconds.
2 Ordinary corrugated paper adhesive viscosity is about 50 ± 10 seconds.
3 Adhesive for automatic veneer and honeycomb paperboard has a viscosity of approximately 70±15
Measure the viscosity of the adhesive:
Place 4 clean and dry coated cups on the rack, adjust the horizontal screws to make the viscometer horizontal, place 200ml enamel cups under the viscosity cup, adjust the temperature of the tested sample to the required temperature, and block the lower mouth by hand. Fill the viscous cup with the sample. Use a glass rod to scrape the air bubbles and excess sample into the groove. Then release the finger and allow the sample to flow out. At the same time, turn on the stopwatch immediately. When the flow of the sample is interrupted, stop timing. The total time (s) out of the viscosity cup is the conditional viscosity of the sample.
Note: The structure of the coating - 4 cups, the upper part is cylindrical, the lower part is conical, there is a groove in the upper part of the container, for excess sample overflow. The viscosity cup is mounted on a stand with two adjustable horizontal screws. Tu--4 cups are made of plastic and metal, and the inner wall finish is 8. The viscometer is the standard and the viscometer must be calibrated before use.
11. When potassium permanganate is used as an oxidant, caustic soda is added in two separate steps. The first time after the addition of potassium permanganate, a 50 to 60% solution of caustic soda is added and the second is added to the oxidation of potassium permanganate. Slowly after 20-30 minutes, avoiding a thick jelly after adding caustic soda.
12. After the common corrugated paper and high-strength corrugated paper are ran through both sides, if run-run or run-in occurs, first check whether the corrugated fiber pattern is parallel to the corrugated fiber (the cross-shaped is the main reason for running) and then select the adhesive with high starch content. , And to minimize the amount of glue, so as not to degummed.
13. In the use of starch adhesives, if the conjunctiva is too fast, the corrugated board will not press the part of the conjunctiva and the degumming phenomenon will occur, so the amount of desiccant must be reduced according to the situation.
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