Analysis of Adhesive Strength Test and Bonding Quality of Corrugated Boxes (II)

4. currently existing problems

4.1 GB6548-86 was formulated 10 years ago, when the corrugated box type was basically type A, but now the carton type has been diversified to A, B, C or even E type, so the bonding in this standard Strength calculation methods and units are no longer suitable for carton inspection requirements.

4.2 According to the provisions of GB-6548: F is the separation force required for the complete separation of the sample, n is the number of turns contained in the sample, and due to the limitations of the test methods, the number of turns of the actual test is at most n-1 .

This has little effect on the situation where the bond strength value is very high or obviously unsatisfactory, but it has an essential effect on the case where the bond strength is between the pass and fail edges. Therefore, I think that the formula (2) should be revised to P'=F/L.(n-1) is more scientific.

4.3 Subjective assumptions were made during the test. Only a peel off of the bonding surface or layer was performed, which made the test result lack of comprehensiveness.

4.4 Although attention was paid to peeling between different bonding surfaces or layers, the weighted average of the test data of the peeling surfaces resulted in a lack of scientific results. In fact, only the test data of the same peeling surface could be weighted and averaged.

4.5 Since bonding strength is expressed in units of N/m2 or kg/10m2, it is easy to understand, so it has long been used in production and testing. However, if no 楞 type is specified, the test data loses comparability.

In addition, many people mistakenly believe that the kg/10m2 and kg/10m. are two equivalent units, and compare the test value in kg/10m2 with the standard value in kg/10m. .

4.6 Confuse the concept relationship between bond strength and bond quality, focus on the judgment of whether the bond strength is qualified, and ignore the deep observation on the peeled sample, mistakenly believe that the higher the bond strength, the bond quality The better, the lack of a comprehensive understanding of the various factors that affect the bonding quality, is not conducive to the improvement of the bonding process and the improvement of the bonding quality.

Therefore, the key to the above problems is the standard aging of the bond strength measurement method, and other relevant standards are not uniform. Therefore, it is necessary to revise the standards related to bond strength testing.
Conclusion In the production of corrugated boxes, adhesives, amounts of glue, corrugating rolls, corrugations, production processes, and paper quality all have an impact on bond strength values ​​and bond quality; therefore, we are conducting corrugated carton inspections. At the same time, we must ensure that the test method is correct, the determination criteria are clear, and on the basis of the correct judgment of whether the adhesive strength is qualified, discover and analyze the influence of various factors on the bond quality, in order to guide the corrugated box manufacturers to improve the adhesive quality of the carton. In order to ensure the safe transportation of their loaded goods.