Factors affecting the compressive strength of cartons

Factors affecting the compressive strength of cartons

1.  The carton is composed of various layers of paper, and the reasonable collocation of paper is the basic condition to ensure the compressive strength of the carton.

Through the physical properties of each layer of paper testing, we can initially calculate the compressive strength of the carton, and then through the calculated compressive strength, the various processes in the production process of carton compressive strength control.

2.  The ring compression strength of the paper is the key to ensure the compressive strength of the carton, but the other physical properties of the paper can not be ignored.

When the tensile strength of paper, especially corrugated paper, is not enough, the force value and deformation of the carton will be steadily increased in the compressive test, the final value is very high and the effectiveness value is very low, and the deformation of the box after the test is like an accordion.  The waterproof performance of paper is also very important, especially the refrigerator has higher requirements for the waterproof performance of paper, sometimes although the compressive strength of the carton is very high, but because the paper is not waterproof, the carton stored in the cold storage is easy to absorb moisture, resulting in the collapse of the warehouse.

3.  The production process of the carton will also affect the compressive strength.

Through the test, under the same conditions, the transverse pressure line of the carton is widened by 1mm, the compressive strength of the carton is reduced by 90N ~ 130N, and the deformation is increased by about 2mm.  The pressure line is too wide, which will cause the force value of the carton to increase slowly during the compression test, the effective value is small, and the final deformation is large.  In order to ensure the compressive strength, we should try to improve the production process and reduce the impact of each process on the compressive strength of the carton.

4.  It is also important to choose the right type of carton according to the type of carton.

In people's consciousness, it is often believed that the larger the corrugated shape, the higher the compressive strength of the carton, and it is easy to ignore the influence of the corrugated shape on the deformation amount.  The larger the corrugated shape, the greater the compressive strength of the carton, the greater the deformation;  The smaller the mold, the smaller the compressive strength of the carton and the smaller the deformation.  If the carton is too large and the corrugated shape is small, the carton will be easily crushed during the compression test;  The carton is too small, the corrugated shape is very large, the compressive test will cause excessive deformation, the buffering process is long, and the effective value and the final force value are too large.

5.  The influence of moisture on the compressive strength of the carton can not be ignored.

The production environment, storage environment, use environment, weather, climate and other factors will affect the water content of the carton.  In order to ensure the compressive strength of the carton, the influence of the external environment on the water content of the carton should be avoided as far as possible.

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