Die-cutting indentation to produce qualified products should have accurate cutting position, clean cut, no burrs, flower knife, clear indentation, and moderate depth.
Common faults and solutions in die cutting and indentation operations:
â‘ The indentation is not clear, there are dark lines, and the lines are fried. (The dark line refers to the undesirable indentation; the explosion line refers to the cardboard breaking due to the excessive pressure of the indentation)
Causes: Poor paper quality, too low water content of the paper, increasing its brittleness and decreasing toughness; wrong choice of steel wire; steel wire pad paper is too low or too high; improper pressure adjustment of the molding machine.
Solution: readjust the height of the steel wire; check whether the steel wire is suitable; adjust the pressure of the die-cutting machine appropriately; adjust the process conditions of the die-cutting indentation according to the condition of the molded cardboard to make the two fit as much as possible.
â‘¡The incision is not smooth.
Causes: The steel knife is of poor quality, the cutting edge is not sharp, and the die cutting is not suitable; the cutting is not timely, the cutting edge is seriously worn; the pressure of the die cutting machine is low or the pressure adjustment is not coordinated with the height adjustment of the steel knife, and the die cutting operation is not compact .
Solution: Regularly check the wear of the blade of the steel blade, and change the steel blade in time; choose steel blades with different quality characteristics according to the cutting performance of the paper used in the printed matter; increase the pressure appropriately; readjust or replace the steel blade or pad paper, so that Obtain a solid pressure effect during die cutting.
â‘¢The position of die-cutting indentation is inaccurate.
Causes: The position of the arranging knife does not match the printed product; the position of the paper feed in the die-cutting operation is inconsistent; the cardboard gripping rules are inaccurate; the cardboard is deformed and the overprint is not accurate during the operation.
Solution: According to the requirements of the proofs, re-correct the position of the printing plate; adjust the positioning rules of the die-cut paper feed to make it consistent with the position of the paper feed; reduce the impact of print defects on the quality of the die-cut according to the cause of the position.
â‘£ The indentation line is irregular.
Causes: The tightness of the row knife and the fixed knife is not suitable, and the bottom cannot reach the ideal contact effect with the iron table plane. Twisting is easy to occur during the indentation (the steel wire is too tight); ); The thickness of the steel wire pad paper is insufficient; the groove angle is not standardized, and there are extra rounded corners; the indentation groove on the steel wire pad paper is left too wide, and the position is not fixed during the indentation.
Solution: replace the steel wire pad paper, leave the pressure groove narrow; increase the thickness of the steel wire pad paper; correct the groove angle; the knife tightness should be appropriate.
⑤ There is a continuous knife in the cardboard after die cutting.
Causes: The pressure on the template is uneven, and the knife is connected where the pressure is low; the blade of the die is not sharp, which causes the knife; the paper is too thick to cut through the paper completely.
Solution: replace the die knife according to the actual situation; increase the local pressure.
â‘¥ After die cutting, the cardboard sticks to the knife plate.
Causes: The rubber stuffed around the knife line is too sparse, and the resilience is insufficient; it is not appropriate to choose according to the performance of the rubber; the steel knife is not sharp, the paper is too thick, causing the clamping knife or excessive pressure.
Solution: According to the situation of the plate steel knife, choose rubbers of different hardness reasonably, and when clogged, pay attention to the distribution of the dense and dense distribution, the main knife edge should not be omitted; adjust the pressure appropriately to make up for the lack of sharpness of the blade, if it can not be solved The problem is to replace the steel knife in time.
⑦ The crease of the folded cardboard is cracked.
Cause: If the outer side of the cardboard indentation is cracked, the indentation is too deep or the width of the indentation is not enough; the internal cracking of the cardboard; the molding pressure is too large or the crease is too deep.
Solution: appropriately reduce the height of the steel wire, and widen the indentation line appropriately according to the thickness of the cardboard; reduce the die cutting pressure or replace the slightly lower steel wire.
⑧Solution of paper deformation die-cut version:
Due to the influence of objective factors, the printed paper is deformed to varying degrees, which causes the die cutting position to be incorrect and re-make the die cutting plate, which causes great difficulty for post-processing die cutting and forming , Greatly reducing the qualified rate of finished products.
The double-knife die-cutting position can be added at an appropriate position in the deformation direction of the printed product to form a front-rear or left-right separation unit. An adjuster is installed between the double-knife die-cutting positions to adjust according to the deformation direction of the printed product during die cutting. According to the deformation size of the printed paper, adjust it at the adjustment position of the hex screw of the adjuster. The square increases the distance between the double knives and the reverse decreases the distance between the double knives. The maximum adjustable distance is three millimeters.
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