Factors affecting the compressive strength of cartons

The main factors affecting the compressive strength of cartons are: ① raw material quality; ② moisture; ③ box and corrugated type; ④ printing and opening; ⑤ processing technology. a. Quality of raw materials Kellicutt formula calculates the compressive strength of the carton according to the ring compressive strength of corrugated cardboard, which is an indicator of the compressive strength of the carton. The ring compressive strength is the bonding strength of the core paper and the face paper or lining paper. The raw material is the main factor affecting the ring compressive strength, which is related to the quantitative, tightness and moisture of the raw material. The grades of containerboard and corrugated base paper are mainly A, B, C, D, E, etc. In general, the principle of grade matching should be followed when selecting materials. The grades of containerboard and corrugated base paper should be similar. The basis weight of paper and corrugated base paper should be kept within the range of 21, so as to ensure the overall quality level of raw materials and the quality of corrugated board. Of course, corrugated cardboard is volatilized by the bonding of top paper, core paper and lining paper, so the factors of adhesive and core paper should also be considered. Appropriate moisture content, tightness and uniformity of the core paper are conducive to the bonding with the face paper and lining paper, and the good adhesion performance of the adhesive and the appropriate thickness of the adhesive layer are conducive to improving the compression resistance of the corrugated box strength. b. Moisture The production environment, storage environment, use environment, weather, climate and other factors of the carton 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 much as possible. The initial moisture content of corrugated base paper will directly affect the quality of corrugated board. High moisture content means that the base paper is soft, but the tensile strength will be relatively reduced; In the production of corrugated board, the moisture content to obtain the best strength value is generally 6% to 8%. The traditional method of moisture determination is the drying weighing method at 105°C, using an oven and a balance, and this method is the standard method. c. Box type and corrugated type Box type refers to the type of box and the size ratio of the same type of box, which have a significant impact on the compressive strength. Some carton boxes are made of double-layer corrugated cardboard, and the compressive strength is significantly higher than that of single-layer boxes of the same specification; under the same conditions, the higher the box, the worse the stability and the lower the compressive strength. 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. The larger the flute type, the greater the compressive strength of the carton and the greater the deformation; the smaller the flute type, the smaller the compressive strength of the carton and the smaller the deformation. If the carton is too large, but the corrugated shape is small, the carton will be easily crushed during the compression test; if the carton is too small, the corrugated shape is large, the deformation will be too large during the compression test, and the buffering process will be long and effective. The force value deviates too much from the final force value. d. Printing and perforation Printing will cause certain damage to corrugated cardboard, which will reduce the compressive strength of the carton. The size of the pressure and the size of the bearing area is a major factor affecting the compressive strength of the carton. If the printing pressure is too large, it is easy to crush the corrugated and reduce the height of the corrugated. Especially when printing at the pressure line, in order to force and clear the printing at the pressure line, the entire cardboard will be crushed, which will greatly reduce the compressive strength of the carton, so try to avoid printing here. When the carton is full or printed around, in addition to the pressing effect of the embossing roller on the corrugated cardboard, the ink also has a wetting effect on the paper surface, which reduces the compressive strength of the carton. When the general carton is fully printed, its compressive strength will drop by about 40%. For products with ventilation requirements, opening holes on the box surface or punching and cutting handle holes on the side of the box will reduce the strength of the carton, especially if the opening area is large, and the impact is more obvious. e. Deviation of processing technology According to the test, under the same conditions, the compressive strength of the carton decreases by 90N-130N, and the deformation increases by about 2mm for every 1mm widening of the transverse pressure line of the carton. If the pressure line is too wide, the force value of the carton will increase slowly during the compression test, the effective force value will be small, and the final deformation will be large. In order to ensure the compressive strength, we should try our best to improve the production process and reduce the impact of each process on the compressive strength of the carton. In the process of box making, improper line pressing, too deep slotting, weak bonding, etc., will also reduce the compressive strength of the box.
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