Xổ số miền Trung thứ năm_Xổ số miền Bắc Chủ Nhật hàng_Xổ số miền Bắc thứ Nam

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    There are no more than four kinds of cardboard stacking shapes: single line parallel stacking; Double row parallel stacking; Well shaped layered stacking; Multi row layered cross stacking. Its advantages and disadvantages are as follows:
    1. Single line parallel stacking
    Advantages: the upper, lower and surrounding of the paperboard can be fully dissipated; One turn of positive and negative code is neat, which is conducive to the flatness of paperboard; Fully bonded in the later stage.
    Disadvantages: the heat in the center of the paperboard cannot be distributed in time, among which the people are soft and the periphery is hard; The corrugated board in the middle and lower part of the stack is also soft, and the thickness becomes thinner after being pressed; The upper paperboard is easy to bow and deform.
    2. Double row parallel stacking
    In addition to the advantages and disadvantages of single line parallel stacking, the stacking has the following advantages and disadvantages: less tray and saving storage space; It is difficult for two stacks of cardboard to emit heat on one side.
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    3. Well shaped layered stacking
    Advantages: the paperboard has good flatness and no warpage. Due to the special stacking method, there is a gap between layers, and the well shape is directly connected to the tray in the middle. The air convection is smooth, the hot gas is distributed evenly and quickly, and the strength is good. Compared with the above two stacking methods, it occupies less tray and saves the site.
    Disadvantages: the overlapping part accounting for 2 / 5 of the paperboard area has endless moisture emission; If the adhesive quality is slightly poor, each layer of composite paper is easy to crack; The number of each layer is different, and the paperboard will be compressed and deformed