Modern printing products is very beautiful, clear, and should not be erased, you know the printing adhesive used is what's it made of? Level of the bonding strength of corrugated board are mainly depends on what? Chongqing digital quick print below will introduce the quality of the adhesive with the quality of corrugated cardboard production line of sizing depends on factors.
Part one： the quality of the adhesive, adhesive used raw material is starch, is not the kind of but we usually eat more than industrial grade one corn starch. Important indicator has solid content, initial stick force.
1. The solid content
Adhesive solids should be according to the actual circumstance of equipment precision, speed and base paper concluded that once the high speed wide corrugated board production line speed to reach above 200 m/min, will demand adhesive solids must be high, the water and starch share usually in 2.5:1, 3:1. Adhesive solid content high, the water relative reduction, less the amount of glue to ensure adhesion of the corrugated cardboard; And in the process of corrugated board moisture change is small, can reduce the corrugated cardboard warping. If equipment low accuracy, slow speed, base paper, adhesive solid content will be a little bit low, otherwise will form the corrugated board degumming, paste line crystallization and critical line quality question.
2. The initial stick force
Adhesion force is to ensure that the corrugated board at the beginning of bonding, and advances the speed of the key. In the corrugated cardboard production, increase the base paper preheating area, perhaps in producing adhesive added as crosslinking agent and carrier, respectively, in the main body and pot add adhesive solids, borax, progress to be able to make the adhesive coated in relatively short period of time after beginning adhesive force, and the adhesion force can damage the fiber paper.
3. The viscosity
The lower the adhesive viscosity, liquidity, the better. Adhesives resolution liquid permeability of the adhesive, resin glue evenness and intrusive, stick directly affects the speed, cardboard, cardboard roughness and strength. Other, not the higher the starch in binder share, liquidity is poor; High solid content of the adhesive after adjustment of manufacturing technology, also can stick to a very low viscosity. Normally, adhesive in cycle use, each after a circulation pump, its viscosity will be decreased. At the moment, should be against the new manufacturing of cement mixed use.
4. Paste temperature
Refers to the starch gelatinization temperature adhesives becomes paste the required initial temperature, glue pasting temperature is the key factor in insist on high speed production of pasting temperature of glue on the handling of questions, except through adjust the dose of caustic soda and the heating method, appropriate to attend some additives can also play the same role. Gelatinization temperature not too low, otherwise will form the glue pasting in the process of circulation and affect the liquid glue. According to season change to adjust the adhesive paste temperature, winter can be gelatinization temperature down to 55 to 60 ℃, the summer is pasting temperature can be raised to 61 ℃, 66.
Part two：the common glue bad cause doubt about the quality of the primary table now the following aspects:
1. A little glue
There is dirt on the rubber roller, such as paper, starch agglomeration and other foreign matter, such as a foreign body may roll top wire hole block, cause on the rubber roller can't smooth on glue, can pass a few glue, and easy to wipe down, glue now stare blankly peak will emerge when the lack of glue quantity, intermittent intravenous drip on the rubber surface. This will face paper and corrugated board appearance core paper traces of stratification, the cartons compressive strength, compressive strength and bond strength will decrease.
When the glue roller and the corrugated roller is too wide, the gap between the corrugated roller under the rubber roller can't come into contact with the local, corrugated stared blankly peak can not satisfied on the adhesive.
2. Adhesive lateral mass ejection
Glue viscosity is too high; Is too high, too low or the inside borax content on the yield line at high speed with simple present adhesive lateral mass ejection appearances, this will cause a cardboard warping or cardboard buckle and carton glue, the side pressure and compressive strength will decline
Chongqing digital quick printing from the glue and glue process fluctuation kongfu, print quality can get very good improve, but didn't think such a common starch has such an important role in printing industry.
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