Problems And Solutions In Color Box Gluing Process
Problems And Solutions In Color Box Gluing Process
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In the process of pasting boxes, everyone will encounter various problems, and at the same time, there will be corresponding solutions to problems. The following is a simple analysis of some problems and their causes:
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1. The adhesive fastness is not high, and the carton is degummed
Degumming refers to falling off due to insufficient adhesive fastness. The main reasons are: insufficient adhesive viscosity or insufficient amount of adhesive; adhesive and carton materials are not suitable; if the adhesive part of the carton is covered by film, For surface treatments such as light, it is difficult for the adhesive to penetrate the paper through the surface layer. Such a carton is more difficult to stick firmly; the pressure after folding and gluing is insufficient and the pressing time is not long enough, which is not conducive to strong bonding.
Solutions for inadequate pasting:
(1) For the above problem of inadequate paste box caused by the adhesive, an adhesive suitable for the carton material to be pasted should be selected. The choice and use of adhesives is also very particular.
First of all, in selecting the adhesive, we also need to analyze the specific situation. According to the carton of different materials and conditions, the choice of adhesive can refer to the following:
1) Packaging boxes without surface treatment, paper and paper adhesives are used when sticking the boxes;
2) The box whose surface is covered with film is selected from the adhesive for bonding film and paper;
3) The surface of the box is oil-based.
4) When the products are sent to cold climate areas, low temperature and strong adhesives should be selected;
5) Products sent to tropical areas should use high temperature resistant adhesives;
6) The automatic box gluer has high speed and short pressing time, so it is necessary to choose an adhesive with fast drying time;
7) The speed of manual box gluing is slow, and the adhesive with slow drying time can be selected for long pressing time;
8) When pasting straight boxes, the curing time can be shorter;
9) When pasting the bottom box automatically, the pressing and curing time should be longer;
10) In summer, choose a binder with a slower drying time;
11) In winter, choose a binder with a faster drying time.
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Secondly, the adhesive must be strong. Because the instantaneous pressure in the molding section is not very large, and the high-pressure operation during the production of 30-40 cartons per minute does not have a long pressing residence time. Adhesive with strong adhesive force can make the carton stick firmly even by pressing lightly.
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Finally, the ambient temperature in the operating room can have some impact on the adhesive. If the operating room temperature is too low, the adhesive will immediately set, affecting the firmness of the bond, even if the amount of glue applied is not effective. Of course, the smaller the amount of glue, the more sensitive it is to room temperature, so in winter, the temperature of the operating workshop should be kept as high as 20 ° C as much as possible, and air conditioning can be installed if necessary. In the operation workshop, a large and easy-to-see thermometer should be installed to check and control the working environment at any time. For pasty products, they should be dried at normal temperature before leaving the factory. In the winter, do not rush to deliver without drying.
(2) For the carton that has been coated and glazed, there are four ways to solve the instability of the glue box:
①When cutting, place a needle-knife on the sticky mouth to pierce the surface of the sticky mouth, which will help the penetration of the adhesive
② Use the edging device attached to the automatic folder gluer to grind the surface of the sticky mouth to facilitate the penetration of the adhesive;
③Inject hot-melt glue to the sticky mouth, and use high temperature to melt the surface of the sticky mouth to improve the firmness of the paste box;
④ When designing the pre-press box type, you can leave a glued part on the edge of the box sheet to be coated and glazed in advance.
(3) For the insufficiency of the glue box caused by insufficient pressure, the pressure of the crimping part of the folder gluer can be increased, the pressing time can be prolonged, or the adhesive with strong bonding force can be replaced.
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2.Carton deformation
There are three main causes of carton deformation:
①Some die-cut plates are made by hand, often the carton is inconsistent due to low accuracy, and the carton is deformed;
② The concentration of the adhesive is low and the water content is large, which causes the cardboard to absorb moisture and deform, and the carton is uneven after forming:
③ The folder gluer itself is not well adjusted.
To solve this problem, as long as the quality of the die-cutting is stable, the appropriate adhesive is selected, and the folder gluer is adjusted, the problem can be solved.
3. The sticky mouth of the carton is skewed
There are three main reasons for the skew of the carton sticking:
① The creasing groove of the creasing steel wire is too wide and the creasing pressure is not enough, so that the creasing line is not full, and the creasing line cannot be pressed accurately when folding;
② The folding transmission is not adjusted properly, the conveying speeds of the left and right sides of the box are inconsistent, causing the sticky mouth to skew;
③ The folding rod is not properly installed.
Solution: Reduce the indentation width of the indented steel wire and increase the indentation pressure; adjust the folding transmission to make the conveying speed of the left and right sides of the carton consistent, and reinstall the folding rod.
4. Sticky mouth misalignment
The misalignment of the sticky mouth means that the sticky mouth is misaligned, and the misplaced paper box cannot be formed well. This phenomenon is usually caused by the inaccurate adjustment of the machine. Furthermore, it is mainly due to the insufficient understanding of the box type and folder gluer by the operator, which affects its operation level.
Therefore, strengthening the training of operators, improving their operating skills and understanding of complex boxes will effectively avoid the problem of misalignment of sticky mouth.
5. Sticky mouth overflow glue
Spilling refers to excess adhesive flowing out of the mouth. This phenomenon is mainly caused by the misplacement of the glue box and the excessive amount of adhesive. The occurrence of glue overflow can be effectively reduced by sanding the glue mouth and reducing the amount of glue.
