What are the factors that affect the resistance value of empty containers in the manufacturing process?

    1. The ratio of carton length (L) , width (W) , and height (H) .

    2. Corrugated board side pressure strength: The lateral pressure value of corrugated paper, the thickness of paperboard, and the bonding quality all have a certain influence on the side pressure strength. Therefore, it is necessary to realize the maximum value-added value of the pressure resistance from the base paper to the paperboard.

    3. Process control from the board to the carton finished product process: how to achieve the minimum devaluation of the pressure resistance from the cardboard to the carton.

   analysis

    1. In reality, the ratio of L:W:H is mostly provided by carton users, and there is limited room for improvement in the proportion. The experiment shows that the optimum ratio of length, width and height of the double-wall (BC wave combination ) carton is about 2.5:2:1.5 ; when the overall size is less than 1200 mm , the value of the empty tank pressure resistance is the highest. Of course, if the contents are fragmented and the dimensions are designed by the carton manufacturer, they can induce the customer to accept the size combination near the above proportions.

    2. Effect of anti-corrugated cardboard cartons pressure value in appearance is reflected in: thickness, with or without down Leng, Leng break, flute ribs, the amount of paste (flute tip) and other factors; mainly in the physical properties of corrugating medium The lateral pressure is the size of the paperboard side pressure, the specific analysis is as follows: A. The corrugator process control upper and lower corrugating roller middle high, parallelism, pressure roller pressure and the parallelism of the lower roller must be normal. If the medium height is too large ( ≥ 12 μm ) or the concave shape ( ≥ 5-8 μm ) is caused by long-term, small-width paper feed, the corrugating roll must be ground, otherwise, there will be cracking, bad fitting or scumming. The amount is too large, resulting in the phenomenon of translucent, will affect its side pressure strength. The speed is too fast. When the roller temperature is not enough, the corrugating is not good. It will cause the collapse phenomenon. Usually when the air supply pressure is increased from 12kg/cm2 to 13kg/cm2 , the surface temperature can be increased from about 175 °C to about 180 °C, only 1kg/ The difference of cm2 can increase the normal speed to about 8-10% , but it uses more steam.

    Corrugated roller due to siphon pipe position is not correct ( from the roller wall 2-3mm is better ) will cause condensing water thermal effect, the roller surface temperature is difficult to reach the temperature value under the corresponding steam pressure need to repair (the same thickness of condensate water insulation effect is much larger For steel rollers, the ratio is about 1:10 times. ) The best value for the upper and bottom roller pressures is about 2.5-3.5kg/cm2 . That is, the pressure must be adjusted to the lowest value after the minimum and the most uniform amount of the upper paste is satisfied. Otherwise, the upper paste line becomes wider. The amount of paste becomes larger and overflows to both sides of the tip of the tip, which directly affects the thickness and the bonding effect of the corrugated stencil. Of course, the levelness of the upper and bottom rollers must be adjusted properly ( relatively parallel when the lines are in contact ) .

    B , the process control of the triple bonder float pressure roller and the upper paste wheel must be parallel to the axial direction (to avoid narrowing caused by the concave ) , otherwise, in order to make the entire width of the corrugated paste, you must increase the pressure wheel pressure and Make the partial width of both sides of the width to be flattened, and the interval between the two rounds must be adjusted according to the different types of concrete. Too small will cause the phenomenon of collapse ( such as: A , C , B different defects or different basis weights. corrugated spacing requirements are different heights) through the number of contacts with the production process of the corrugated wheel paste should be kept at 3-5 best. Another use of pressure bar instead of floating pressure wheel can also receive good results, but manufacturers need to be careful with the price. Process points here: In order to meet the finest paste line, the most uniform under the premise of the premise, to minimize the loss of corrugated thickness.

    C. Influence of Hot Plate ( Dry ) Process The relative distance between the canvas pressure roller and the hot plate surface is one of the main factors affecting the thickness and bonding quality of the cardboard. The distance must be adjusted according to the theoretical thickness of the cardboard plus the thickness of the canvas itself. If the distance is too small, then the "wet" tip of the wave just after the paste will be flattened, and how much the loss of intensity is expected. Whether it is a single tile or a double tile, the height of the pressure roller must be adjusted depending on its requirements. In addition, since the hot plate part cannot completely disperse the water vapor inside the paperboard, the hardness of the paperboard will be affected after cooling. Therefore, if necessary, the newly emerged paperboard can be blown along the direction of the corrugated fiber to make it fully dissipate heat and maintain a good hardness. , Reducing the softness of cardboard due to the increase of condensing moisture in the steam. The flatness of the paperboard is related to the moisture of the paper. It is necessary to proceed with the preheating area. The amount of the upper paste is too large or uneven, which is also one of the main factors causing the board to bend. The number of hot plates and the surface temperature directly affect the production speed.

    3 , carton printing and post-processing

    A. The effect of pressure on the paperboard thickness caused by the pressure of the paper feeding roller of the printing press ( automatic feeding ) . Because the width of the paperboard is small, it cannot be extended to the printing unit. In addition, the friction force is insufficient and must be tightly clamped to increase the drag force. When the paperboard is piled up too much at the paper feeding section and the weight is increased, the paperboard must be pinched tightly to increase the drag force and the like causes the paperboard to be crushed by the feed roller. The main thing is that when printing different thickness paperboards, the paper feed roller ( Rubber ) is not adjusted, it is often thought that the tighter it is dragged, the more stable it is. Therefore, before the production, the paper feeding section and the printing section must be opened, and the cardboard is moved forward from the rear ( printing section ) . Optimum clearances where the paperboard can easily pass through the platen but with a certain clamping force are the best; it is highly commendable for the operator to insist on the “trimming” action and standardization of each batch of cardboard prior to printing.

    B. Printing Plate Pressure Causes Trays to Become Corrugated The over-adjustment of the bottom wheel pressure to achieve printing requirements due to overprinting or other reasons is the greatest harm. It must be cushioned with a durometer pad underneath the flexographic plate or overcome by improving the ink ( aqueous ) properties. Whether or not the printed board has a colored block or a printed area, will obviously feel the uneven transition. If so, it indicates that the pressure of the offset plate is too large and needs to be adjusted. To achieve a "kiss-touch" effect between the offset and the cardboard, in addition to the equipment and the process, the operator must also feel attentive.

    C. The impact of the opening of the carton on the resistance of the empty box must be reduced as much as possible to reduce the destructive pressure of the repellent sponge on the cardboard during the operation process, often because the fear of the surface of the paper breaks and the cardboard is opened. Flattening is the greatest damage to the carton's ability to resist pressure. The purpose of the sponge is to retract the knife instead of flattening the corrugated sheet. The specific problem is to solve the problem from the improvement of the tool and operation. When the cardboard thickness is certain, the printed and post-processed cartons should be in the process of testing the compressive value of the empty box. The four sides or four corners of the carton should be crushed at the same time, any one face, two faces or one corner The phenomenon that the two corners were first crushed all explained the problems in the printing and post-processing processes. The maximum value of the maximum pressure resistance of the carton obtained in the same carton under the above two different crushing phenomena was quite different.

    In summary, the control of the production process plays a decisive role in the influence of the air-resistance value of the carton under a given material condition. How to gradually implement some of the improvement plans and put them in a continuous improvement monitoring state is the majority of carton manufacturers The problem of managerial headaches must benefit from the internal standardization implementation and the continuous improvement of the cultural atmosphere; process technology must also be transformed through good management mechanisms in order to give full play to its proper productivity effects.

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