Regarding the quality of the glue box and the key points to solve! !
Date:2021-03-05
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       In the process of pasting boxes, everyone encountered various problems, and at the same time, a variety of solutions appeared.
 
  1 The bonding fastness is not high, and the carton is degummed. Degumming refers to the cracking of the adhesive due to insufficient bonding fastness
 
  The main reasons are summarized as follows:
 
  (1) The viscosity of the adhesive is insufficient or the amount of glue applied is insufficient.
 
  (2) Adhesive and carton material do not match.
 
  (3) The sticking part of the carton has been surface-processed such as laminating, glazing, etc. It is difficult for the adhesive to penetrate the surface and penetrate into the paper, making the carton difficult to stick firmly.
 
  (4) The pressure is insufficient after folding and gluing, and the pressure time is not long enough, which is not conducive to sticking firm.
 
   For the above-mentioned problem that the glue box is not strong, the glue that is compatible with the carton material should be selected, and the choice and use of the glue are also very particular.
 
   First of all, it cannot be mistakenly assumed that the higher the viscosity of the adhesive, the better the box-gluing effect. With high viscosity, the strength of the adhesive will increase, and the wrinkle rate will increase accordingly. When the glue roller of the automatic box gluer is running at a high speed of 112 revolutions per minute, the recommended viscosity of the adhesive is 500 to 1000 cps.
 
  Secondly, the adhesive has a strong binding force. Because the instant pressure of the forming part of the automatic folder gluer is not very high, and in the high-speed operation process of producing 30-40 cartons per minute, the pressure time is not long. The adhesive with strong binding force, even if it is light Pressure can also bond the carton firmly.
 
   In addition, the ambient temperature of the paste box workshop will also have a certain impact on the adhesive. If the temperature in the box-gluing workshop is too low, the adhesive will solidify immediately, which will affect the fastness of the adhesion, even if the amount of glue applied is no longer effective. Of course, the smaller the amount of glue applied, the more sensitive it is to room temperature, so in winter, the temperature in the box-gluing workshop should be kept above 20°C, and air conditioning can be installed if conditions permit. In the box-gluing workshop, a large and easy-to-see thermometer is also installed to check and control the working environment at any time. For products with good paste, they should be dried at room temperature before leaving the factory. In winter, do not rush to deliver them before they are dry.
 
   There are 4 ways to solve the problem of inadequate box gluing for the carton that has been coated and polished:
 
   One, when die-cutting, place a needle and thread knife on the sticky mouth to pierce the surface of the sticky mouth to facilitate the penetration of the adhesive.
 
  Secondly, use the edging device attached to the automatic folder gluer to break the surface of the sticky mouth to facilitate the penetration of the adhesive.
 
   Third, spray hot melt adhesive to the sticking part, and use high temperature to melt the material on the sticky mouth surface to improve the fastness of the box.
 
  Fourth, when the box is designed before printing, the glued part can be reserved on the edge of the box to be coated and polished in advance.
 
   For the phenomenon that the glue box is not strong due to insufficient pressure, you can increase the pressure of the crimping part of the folder gluer, prolong the crimping time, or replace the adhesive with strong adhesion.