4.2 Failure Modes, Effects, and Harmfulness of Compressive Strength of Corrugated Boxes, Analysis [2]
1) After analysis, the compressive strength of corrugated boxes is less than o. 5, need to improve the reliability of the base paper from the formula ratio and process. According to statistics, the main failure modes are crushing and creep. The reasons are: (1) If the core paper is made of high-strength corrugated paper, the failure mode is mostly creep; if the core paper is made of ordinary corrugated paper, the failure mode is mostly crushing. (2) Most of the kraft noodle paper is made of domestic waste pulp.
2) Improvements for three-layer B-type corrugated boxes. The paperboard core paper is 150g·m-2 grade C corrugated paper, the ratio of its raw materials: 30% imported waste pulp, 70% straw pulp; changed to: 65% imported pulp, 10% cement bag waste pulp, 20% Straw pulp, 5% domestic waste pulp. This will greatly increase the strength of the core paper. The corrugated paper box with improved pulp ratio was subjected to reliability test. The data was used to describe the growth process of the strength of the three-layer B-type corrugated box with the compertz reliability growth model, which provided a reliable theoretical basis for product modeling and quality management.
4.3 Three-layer B-type corrugated box reliability growth model of compressive strength
1) Determine the starting point for reliability growth. Use the reliability corresponding to the average life of the initial product as a starting point for growth. From the normal distribution of the reliability function: 
The known u0, mouth and average life (x0.5): 1052.5N were substituted into equation (1), and the normal distribution was found to be: medium (0.014): 0.6591, then Ro. 5-0.6591=0.3409.
Describe (calculate) the reliability growth of the compressive strength of a three-layer B-type corrugated box using the compertz (success or failure) mathematical model.
(1) Data compilation. Under the same conditions, the raw material ratio of improved core paper
(Wen/Li Yusheng Chongqing Technology and Business University)
Packaging Engineering
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