1 cardboard adhesive (1) Importance of adhesion Reliable bonding is necessary to form and maintain the characteristics of the corrugated cardboard frame, and it is also important for the quality of the final corrugated box packaging. Poorly bonded cardboard can clog or stop other post-processing equipment, causing loss of production. (2) Inspection of Adhesion Quality The PAT method is a method of measuring adhesion quality in the laboratory. In actual production, operators in the corrugated board production line generally tear the backing paper by hand to check the bonding quality of the paperboard. If the adhesion is good, the backing paper Some of the corrugated core paper fibers should be adhered; if the bonding is not good, the liner and corrugated medium are completely separated. (I) Reasons for poor adhesion of single-sided cardboard 1 Occurs on the cardboard edge 2 Occurs in the middle of the board. Due to the change in the width of the board, the middle of the corrugating roll is worn and the adhesive supply is insufficient. 3 occurs within the entire width of the cardboard (b) Reasons for poor adhesion of double-sided cardboard 1 occurs in the middle of the cardboard 2 occurs within the entire width of the cardboard 2 seesaw phenomenon The so-called see-saw phenomenon refers to the corrugated paperboard after being made. On the surface of the surface paper, there is a concave phenomenon between the back of the peak and the back of the peak, and the shape is the same as that of a domestic washboard. It is called a see-saw phenomenon. (1) The root cause of the seesaw phenomenon in corrugated board: (2) The specific methods of controlling the board seepage are: 3 down (1) Single cardboard dump Cause Analysis: Solution: (2) double-sided cardboard Cause of square analysis: 1 after the two-sided machine after the plastic smashing, is the gap between the rubber roller and the ballast roller is too small; 2 after the dryer is poured, the floating ballast roller above the conveyor belt can not freely move up and down The pressure corrugated deformation; 3 glue is too large, corrugated paper absorption of a large amount of water in the glue becomes soft, along the direction of operation of the dryer one-sided; 4 watts of paper quality times. Solution: 1 Adjust the gap between the double-sided machine, the ballast roller and the rubber-coated roller to be slightly smaller than 0.2mm on the single-sided cardboard. The single-sided cardboard can be installed between the ballast roller and the rubber roller in the longitudinal direction. It is better to insert and drive the ballast roller to rotate without distortion; 2 to adjust the free movement of the float roller on the conveyor belt; 3 to reduce the amount of glue applied to evenly distribute the corrugation peak, instead of flowing into the tile groove; 4 Replace the paper. 4 Wrinkle (1) Paper creases Cause Analysis: Solution: (2) Wrinkle paper Cause Analysis: Solution: (3) Wrinkle wrinkle Reasons: The strength, moisture, and thickness of the two ends of the terracotta paper are not uniform and the brakes are insufficient. Solution: Adjust the warm-up area, tighten the brake valve or flip the paper. If wrinkles still occur, replace the paper. 5 bubbles (1) Paper bubble Cause Analysis: Solution: (2) Face paper foaming Cause Analysis: Solution: 6 (1) single-sided cardboard corrugated crusher Cause Analysis: Solution: (2) After the double-sided machine broken corrugated Cause Analysis: Solution: 7 Cause Analysis: Solution: 8 Cause Analysis: Solution: Cause Analysis: Solution: Cause Analysis: Solution: Information Processing: Carton Street If you want to know more about carton information, search for the public number [Carton Street] Reed Diffuser,Hotel Air Freshener,Fresh Reed Diffuser,Fragrance Fan Dispenser Comebest , https://www.comebest.com
(3) Causes of poor adhesion
a. The pressure between the lower corrugating roller and the pressure roller is not enough.
b. The parallelism of the lower corrugating roller and the pressure roller is deviated
a. The gap between the squeegee roller and the squeegee roller is not set properly, causing the adhesive film to be insufficient (too thin).
b. The gluing roller is too far away from the lower corrugating roller.
c. The adhesive level in the plastic tray is too low.
d. Bad adhesive quality.
e. Corrugated roller temperature is not high enough.
f. The pressure of the pressure roller is uneven or insufficient.
g. Adhesive coating is insufficient, paper is not warmed up, preheater is wound or the temperature is not enough.
h. The moisture content of the paper is too high, the winding angle in the preheater and the corrugated paper preparation device is not enough, or the speed of the single-sided machine is too fast.
a. The pulling force of the single-faced corrugated cardboard excessively deflects the guide roller (floating roller), resulting in insufficient coating of the adhesive.
b. Due to thermal expansion, the pressure on the cardboard in the middle of the hot plate is insufficient, and the blower unit can limit this problem.
c. Since there is not enough evaporation in the center of the cardboard, the adhesive cannot be fully gelatinized. If the temperature of the hot plate cannot be increased, the only way is to reduce the speed.
a. Adhesive coating is not full, preheater winding is not enough, belt pressure is not enough, speed is too fast or hot plate temperature is too low.
b. Adhesive film is not enough.
c. Poor adhesive quality.
This is mainly due to the improper sizing of the adhesive, which is caused by the excess glue that collects on both sides of the peak. This situation is particularly detrimental to the low-quantity linerboard.
(1) Adjusting the ration of pasta paper and changing to a higher-quantity linerboard is the most direct and effective way to eliminate and reduce the stencil shape (but it will increase the cost);
2 The use of high quality adhesives can reduce the peak amount of sizing;
3 control the surface of the heating paper on the preheater, because the board paper is too dry and the amount of glue intake is high, and it is easy to produce the phenomenon of see-saw;
4 Adjust the parallelism of the glue machine and the paper guide roller of the compound glue machine and the gap between them, and strictly control the pressure level of the guide roller (pressure roller) to prevent the amount of glue from collapsing to increase.
1 corrugated roller wear;
2 The upper and lower shoe roll gap is too large;
3 watts of paper is too heavy and too thick;
4 watts of water is too large;
5 watts without poor preheater plasticity.
1 Replace the roller or grinding;
2 Adjust the gap between two watts to 0.5mm;
3 Replace the paper
4 adjust the size of large-sized tiles for preheating;
5 Pass the tile through the preheater.
1 watt uneven thickness;
2 Direct input to the corrugator without preheating;
The brake at both ends of the 3 watt paper does not match
4 watts water imbalance;
5 The paper guide rollers are not parallel.
1 Replace the paper
2 Pass the tile through the preheater;
3 Adjust the tile brake balance;
4 increase the preheating area of ​​corrugated paper or replace the paper
5 Correct the paper guide roller.
1 paper guide rollers are not parallel;
2 Dryer feed port skew;
3 watts of water imbalance;
Uneven tension at both ends of the 4 watt paper.
1 correct the guide roller;
2 correct the dryer paper feed port;
3 increase the warm-up area of ​​tiles;
4 Replace the paper.
1 watt of paper is not warm enough;
2 paper brake tension is insufficient;
3 The temperature of the warm-up cylinder is less than 4 when starting up. The pressure roller is worn or not parallel;
5 The rubber roller wears partially with difficulty or there is foreign matter caught in the middle of the coating roller and the adjusting roller;
6 The corrugation roller part of the suction slot is blocked and the paper guide plate is worn.
1 increase the warm-up area of ​​tile
2 tension brake valve;
3 When the temperature rises to 180°C, restart the paper;
4 Replace grinding pressure roller or calibrated to parallel;
5 Replace the rubberized roller and remove the debris between the roller and the metering roller;
6 Clean the corrugation roller suction slot and replace the guide plate.
1 watt water imbalance;
The 2-sided paper is directly input into the dryer without a preheater;
3 glue viscosity is not enough;
4 paper scraps and plastic blocks are sandwiched between the glue roller and the regulating roller;
5 The glue roller is not parallel or worn.
1 Replace the paper
2 Pass the tissue paper through the preheater and adjust the preheat area appropriately;
3 increase the viscosity of glue;
4 Clear the foreign material glue block between the coating roller and the adjustment roller;
5 Correct the rubber roller or replace it.
Corrugated crusher
1 pressure roller pressure is too large;
2 watts short fiber, no toughness, poor quality;
3 The clearance between the top and bottom two watts is too small;
4 The preheating area is too large and the paper is seriously dehydrated;
5 corrugating roller temperature is too high;
6 The high wear of the corrugating roller is serious. After the pressure roller is lifted, the stress of the corrugated paper is unbalanced, causing the pressure at both ends of the single-faced roller to be damaged.
1 properly reduce the pressure roller pressure;
2 Replace the paper
3 correct corrugation roll gap;
4 reduce the warm-up area;
5 Reduce the temperature of the corrugating roller to 160 °C and then turn it on;
6 Replace or grind corrugated roller.
1 There are burrs on the flyover or multiple preheater cylinder surfaces of the flyover to cause mechanical scratches;
2 The transfer belt of the flyover to single-sided machine is buckled.
1 Check that there are burrs that cause the crushing of the corrugated, smooth and smooth with sandpaper or board;
2 Replace the buckle and reconnect it.
Crimping creases uneven and uneven
1 pressure line is too shallow;
2 pressure line adjustment device failure;
3 pressure roller deformation;
4 The pressure line cam wears badly and the wear level is not taken into account in the production.
1 adjust the pressure line to the inside of the paper is not broken and folded after the pressure line is clear and straight;
2 calibration maintenance pressure adjustment device to normal;
3 replacement pressure roller;
4 The degree of visual pressure is moderately deep.
Slitting
1 paper knife is blunt or notched;
2 Upper and lower knife bite too deep;
3 There is a gap between the upper and lower blades.
1 polish or replace a new knife;
2 adjust the knife and knife to coincide with the best condition;
3 Close the upper and lower blades and rotate the cutter wheel by hand. It is advisable to flexibly not hurt the knife.
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Cross-cut cardboard trails
1 Horizontal knife is blunt;
2 The cross-knife cuts up and down two pieces, and the part where the paperboard cuts continuously brings up the tearing surface tile under the mechanical force;
3 Incorrect adjustment of the instantaneous acceleration of the cross cutter results in blockage.
1 tool change, grinding;
2 Correct the positions of the two knives;
3 Correctly adjust the instantaneous acceleration according to the length of the board.
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Corrugated cardboard
1 NaOH content in the rubber is too large;
2 Overlapped stacking of the upper board cardboard was too high, and the water vapor in the board was not fully distributed;
3 The cardboard storage environment is too hot and humid;
4 The temperature of the dryer is lower than 180°C and the speed is too fast. The low temperature environment causes dry artifacts. After the stacking, the corrugation becomes soft and the cardboard reduces the strength.
1 Adjust the amount of alkali used for the glue;
2 It adopts well-shaped stacking and the stacking height is not more than 1.5m. If necessary, a blower can be used to force ventilation to disperse water vapor in the board.
3 Ventilate and cool the storeroom where the cardboard is stored, and remove moisture from the lime powder on the site;
4 According to the amount of glue, paper quality, dryer temperature, in order to ensure the quality of the cardboard board to get a good grasp of speed. 