Bad types of corrugated board (2)

First, poor adhesion

1、Poor paper lamination reasons:
(1) Insufficient supply of paste (disappearance);
(2) The heat plate and conveyor belt clearance is too high;
(3) The speed is too fast, resulting in insufficient paste gelatinization time;
(4) The clearance of the squeegee roller is too small and the amount of the upper paste is insufficient;
(5) The viscosity of the paste is not up to standard (too high or too low);
(6) The tip paste becomes white powder, which is too high gelatinization temperature, the paste is not cured;
(7) The tip paste is black and shiny. This is because the gelatinization temperature is so low that the paperboard is gelatinized before it enters the hot plate;
(8) A, B brake roller brake pressure is too low or paper is too loose;
(9) Insufficient temperature or water in the triple preheating cylinder;
(10) The hot plate has insufficient temperature or water. 2, face paper paper tie bad reasons:
(1) Paste gelatinization temperature is too high or too low;
(2) Insufficient sizing of the base paper or too much sizing;
(3) excessive wear on the conveyor belt edge;
(4) The moisture content of the tissue paper is too high;
(5) The paper is over-stressed;
(6) There are too many papers on the bridge or the suction force of A and B is not enough. 3, facial paper blisters:
(1) The original paper force is too small;
(2) The gap between hot plate and conveyor belt is too high;
(3) The raw paper is unevenly pulped or too dry;
(4) A, B 楞 楞 楞 楞 or 楞 楞 楞4, A楞 and B楞 fit bad reasons:
(1) The speed is too fast for the paste to mature;
(2) The gelatinization temperature is too high or too low;
(3) The viscosity of the paste is not up to standard;
(4) The amount of upper paste is too small (smudge roller gap is too small);
(5) Insufficient temperature or water accumulation in the triple preheating cylinder;
(6) hot plate temperature or water;
(7) A, B sucking wind power is too low;
(8) The preheating area of ​​A and B in the triple preheating cylinder is too small, resulting in insufficient preheat;
(9) The gap between the conveyor belt and the hot plate is too high;
(10) A and B are too moist and the water content is too high. 5, the paper bubble causes:
(1) The parallelism between the two sides of the base paper is not adjusted;
(2) Insufficient tension of the automatic feeder board, the brake force of the original paper carrier is too small;
(3) Paste gap adjustment is not in place;
(4) The water in the raw paper section is not uniform;
(5) Pressure roller clearance is not adjusted;
(6) The brake tension of the end paper is too high;
(7) The paste roll wear is extremely severe;
(8) The speed suddenly increases or decreases;
(9) The original paper is uneven or too dry. 6, the reasons for bad paper fit:
(1) The pressure roller gap is not adjusted in place;
(2) The eccentric core of the roll is not adjusted in place;
(3) The water content of the base paper is too high;
(4) The base paper frame brake tension is too small;
(5) Preheating area of ​​bottom paper and core paper is too small;
(6) Preheat cylinders, pressure rollers, corrugated rollers, or insufficient temperature;
(7) insufficient steam supply;
(8) Roller gap adjustment is not in place;
(9) The clearance of the squeegee roller is too small and the amount of paste is too small;
(10) The viscosity of the paste does not reach the standard;
(11) The gelatinization temperature is too high or too low;
(12) The speed is too fast. 7, single-sided movement of the paper has a reason for falling or high and low defects (1) corrugated roller eccentric core is not adjusted;
(2) The corrugating roll wears badly;
(3) Paste, dust and other debris on the corrugating roll;
(4) There is too much and too much gap in the core paper;
(5) The paper suction windmill suction is too strong or too weak;
(6) The pressure on both sides of the upper and lower corrugating rolls is not uniform.

Second, cardboard bending: cardboard bending by the raw paper moisture content, the nature and type of paper, mainly through the warm-up cylinder warm-up procedures, the amount of paste, tension adjustment.

1, left and right bending reasons:
(1) The water in the paper is too high;
(2) Insufficient preheating of paper;
(3) The amount of paper on the paper is too large;
(4) The paper brake tension in the gluing machine is too small, and the temperature of the triple preheating cylinder is insufficient;
(5) The paper brake tension is too large, and the triple warm-up cylinder paper is too warm;
(6) There is too little pasty paper;
(7) Hot plate temperature is too high;
(8) The canvas is too low;
(9) The speed is too slow. 2, left and right bending reasons:
The reason is the opposite of the right and left bends (slightly). 3, before and after bending reasons:
(1) The brake pressures of the gluing machines A and B are too high;
(2) Face paper brake roller wire is too low. 4, bend before and after the reasons:
The reason is opposite to the reason for bending before and after (omitted). 5, side (twist) bending causes:
(1) The paper rollers of the gluing machines A, B, etc. are not parallel, resulting in uneven paper force;
(2) Uneven surface water;
(3) The paper brake tension is too high. 6, "S" type bending causes:
(1) Uneven paper paste;
(2) Uneven water in the paper;
(3) The adjustment of parallelism in the paper is not in place;
(4) Uneven dough paste;
(5) Uneven surface water;
(6) The adjustment of the parallelism of the tissues is not in place.

Third, the paper ribs

1, Scratch ribs shape reasons:
This is mainly due to the fact that the hot plate fails to adjust parallel or the height of the previous piece between the two hot plates is lower than the back piece. 2. Causes of dip between depressions:
(1) The physical properties of the base paper are not up to the standard;
(2) The amount of paste is too large;
(3) hot plate wear (high and low uneven);
(4) Core paper has high and low defects;
(5) Face paper is too strong and heat is too high. 3, indentation, black paper-like reasons:
(1) The gluing machine press roller is too low;
(2) The amount of paste is too large;
(3) The canvas is too low;
(4) The amount of caustic soda is too strong to cause excessive penetration.