How to check the firmness of the paste box in the packaging process

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In the packaging and printing industry, the application of the folder gluer is the final process of packaging box processing. It is to fold and print the printed and die-cut cardboard, and glue it to the glue. Labor costs increase efficiency. The parts of the folder gluing machine are divided into a paper feeding part, a pre-folding part, a hook bottom, a forming part and a box pressing part. According to the function, the folder gluer is divided into smooth paste box gluer, hook bottom glue box machine, etc. The general folder gluer does not have groove bottom function or even pre-folding. There are pre-folding. Of course, you must use a groove bottom paste box machine to make a hook bottom box. The better function paste box machine can also make hexagonal and opposite sex boxes, but it needs to be equipped with a glue spray system and other devices.

Folder gluer

Folder gluer

1. Traditional inspection methods

For the inspection of the fastness of the glue box, the traditional method is that the operator tears the adhesive mouth according to his own experience to judge the quality of the adhesive. It is generally believed that after the paper fiber is peeled off, if the damaged area exceeds 70% of the sticky mouth, it indicates that the paste box has good fastness. The advantage of this inspection method is: problems can be found in the process of gluing boxes in time, and adjustments can be made in time. The disadvantage is that it is greatly influenced by human subjective factors.

2. Data inspection method

In the adhesives industry, paste box fastness is usually described by paste box strength. Paste box strength is defined as the force required to cause the adhesive to be damaged at or near the interface of the adherend under the action of external forces.

The glue box strength is tested using the national standard GB / T2791—1995 Adhesive I Peel Strength Test Method. This experiment is designed based on the force peeling model of adhesive at the adhesive mouth during manual tear test, and is used to test the bonding strength between flexible materials such as paper. The force direction of the adhesive at the adhesive mouth is at a certain angle to the paper, and the angle remains unchanged during the tearing process. The downward force of the roller can be used to quantitatively describe the strength of the paste box.

3. Adhesive aging test method-hanging test

Because the adhesive is prone to aging and failure in high temperature and high humidity environment. Based on this principle, cut the pasted carton into a ring of a certain width from the perpendicular to the adhesive mouth, hang a certain weight, hang it in a high temperature and high humidity environment, and test the hanging time and the length of time The fastness of the glue box can be described.

The above three methods for testing the fastness of paste boxes are the most operable with the first and third methods. Using these two methods can basically meet the requirements of product quality inspection, so it is accepted by many companies and customers.

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Editor in charge: Liu Yang

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