Solve "bad glue" to improve the quality of corrugated cardboard – corrugated cardboard, cardboard – Printing Industry
In Corrugated Carton Production practice, a variety of adhesion between the paper is a very important part, and to a certain extent determines the quality of the product level. Adhesion between the sheet layers are close strong, direct impact on the quality of corrugated cardboard. Good adhesion of corrugated board Table Surface smooth, no foaming, no wrinkles, no warping, after processing into corrugated sheet does not produce separation between the appearance stiffness, better compressive strength and cushioning properties, can effectively protect the contents from the outside world commodity damaged by negative factors. However, in the corrugated cardboard production line corrugated cardboard bonding occurs adverse (blistering, degumming, false grains) phenomena occur. It is understood that corrugated board production line waste generated in seconds, caused by bond issues accounted for nearly Qi Cheng. Therefore, to truly achieve the objective of reducing cost and increasing, the problem must be due to viscous and rate control waste generated in the appropriate range. Then, we will find the board "bad bond" causes you problems encountered in the actual production, provide a range of solutions.
Corrugated cardboard is a good bonding is a physical performance test of corrugated board is an important indicator. Affect the reasons for corrugated board adhesion complex, generally speaking, base paper, Adhesive , Corrugated cardboard machinery, production scheduling and operational level employees, etc., are imposed on its effects, and these factors also influence each other.
Base paper Here mainly in several ways:
1. The moisture content of base paper: Cardboard Or corrugated paper is too dry (less than 6%) or water is too large (above 12%), will result in poor adhesive corrugated cardboard. Too dry, the adhesive bonding the swelling and water is necessary for absorption of base paper, resulting in the phenomenon of plastic is not pasting. Water is too large, the excess water on the heat absorption, resulting in less heat and thus poor adhesion. The solution is to strictly control the moisture of base paper, wet the treatment to be too dry, water is too large, it should be an appropriate increase in base paper moisture, warm area, if still poor, you must change paper.
2. Absorbent or permeable base paper is good or bad: base paper material, tightness and degree of sizing, determine its water absorption or permeability. Absorbent or porous bad to the base, will inhibit the penetration of adhesive bond; water absorption or permeability of the base paper is too strong, not a cause gum paste phenomenon, two phenomena will have through the plastic. The former solution is used in glue Additive The use of additives to improve the hydrophobic nature of the base paper surface, so that adhesive can penetrate. In addition, the appropriate increase in adhesive Coating Amount necessary. We know adhesion corrugated corrugated corrugated paper first peak adhesive, and then with the surface of paper or a sandwich in a combination of adhesive at any level, impeded the transfer between both will affect the bonding effect. For example, the Texas Hu-Ping Wing of the company's A-level paper A Straw pulp Corrugated paper, after re-sizing treatment, water absorption is poor, do not use water-based adhesives can not get good adhesion. The latter solution is appropriate to increase the viscosity adhesives.
3. Base paper breaking length: it is the intensity of the original paper and quantitative ratio of the width of the paper that must be pulled off its own weight when the required length. If the base paper breaking length low, so in the tile line speed up to a certain extent, is bound to paper and often break down at this time remain in the drying tunnel in the corrugated board absorb too much heat, even the best of the adhesive can not be good adhesion. This case, the solution is to reduce the machine speed, or improve the quality base paper, the breaking length test items into the base paper.
4. Base paper side of the slack: if one side is loose corrugated paper, corrugated cause uneven impact and cardboard fit; If the board side of the pine, will be formed on the surface wrinkles in the cardboard. Severe adhesion formation are poor. Solution to replace the base paper only.
The quality of adhesive Here are mainly reflected in two aspects: First, Starch Quality is good or bad, and second, adhesives Make Technology advantages and disadvantages.
1. Starches lower level, means that processing fine difference, protein, fat, ash and other impurities more, using such a starch, one will consume more Sodium hydroxide So unstable adhesives, bonding of corrugated board easy to absorb moisture, place a short time in the humid environment, will make corrugated cardboard degumming; second is easy to glue to the larger starch particles and impurities as the core and the gel, so that adhesive liquidity variation, uneven coating, so that local non-corrugated plastic, small plastic, resulting in poor adhesion. Solution is to use high-quality starch, corn starch, if advised to use more than industrial grade product. Advantages and disadvantages of adhesive production process is even more important. Corrugated board adhesive, appropriate solid content, viscosity and pasting temperature necessary. Adhesives in general Cycle Use, the viscosity of each adoption cycle Pump Time, there is decreased. At this point, the glue should be prepared to join the new mix. [Key words]: Corrugated Cardboard Corrugated Box Comment Large In Small
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