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Printing slotting machine cause of cardboard warping is the work

The authors:SHANGHAI SHUNGE   Release time:2015-04-04
carton machinery factory:Broadly, cardboard warping is a corrugated board on combination part to uneven size changes, especially the core paper, usually occurs in the corrugated stare blankly tip and bottom paper firm and and no longer occu

carton machinery factory:Broadly, cardboard warping is a corrugated board on combination part to uneven size changes, especially the core paper, usually occurs in the corrugated stare blankly tip and bottom paper firm and and no longer occurs between the two relative motion (slide).Cardboard warping machine direction (MD) is due to the rolling direction in the parts all kinds of force is not original balance and the imbalance caused by the periodic change of the rolling direction on the following paper in parts of the non-uniform change of type (end-to-end S - cardboard warping).The force plays a main role here is paper tension.
If the paper is on the level of tension is higher than the lower bottom paper tension, become warped on can cause end-to-end cardboard warping.Occurred after the warping because cardboard is bonded, the level of paper than the extension of the lower bottom paper degree is high.Therefore, cardboard back stretch more, when after cutting board to release tension.On the other hand, if the lower end of the tension of the tension on the above aspects of paper, paper, end-to-end under bending board warp.Therefore, if any side of the face paper or cardboard on both sides of tension occurs on a large scale fluctuation, occurs end-to-end S - cardboard warping.Parallel to the direction of the corrugated cardboard warping is mainly due to the corrugated direction under the unbalanced force generated in the original paper in corrugated direction caused by the uneven changes.Here are the main force is caused by water content changes, the so-called "wet up" of the characteristics of base paper caused by the contraction and expansion drive.This wet up on the corrugated direction is greater than the machine direction, it shows that we are the most serious problem is on the direction of corrugated cardboard warping, illuminate how wet miscellaneous grain in the base paper is also trouble.As a result, many cartons enterprises do most of the work is all about on the direction of corrugated cardboard become warped, namely the study of the direction of corrugated cardboard warping and control.

Roughly speaking, every change of base paper moisture content 1% will change the size of the direction of corrugated cardboard 0.06% ~ 0.10%.Because during the cardboard through corrugated board production line, the change of water content can reach l5 % ~ 20%, thus may cause the cardboard relative change in the size of 0.9% ~ 2%.In a 80 inches (2.03 m) wide on the board of this value from 0.72 inches to 0.72 inches (18 mm ~ 41 mm).Such a big size change, had a great influence for cardboard warping.So, careful control of moisture content in base paper for flat cardboard production is very important.

The change in temperature also cause the size of the board.However, its influence for cardboard warping relative is the smallest.The factors to isolate the heat treat very hard, because of the change in temperature is usually accompanied by, or cause actually base paper moisture content changes.With cardboard and water content changes happened in the process of producing difference causes to explain on the direction of corrugated cardboard warping is credible.

The relevant information:
SHANGHAI SHUNGE CARTON MACHINERY MANUFACTURE CO.,LTD Add: zhongmin road Maogang town, songjiang district, Shanghai
Mob:0086-13102721466 Website: http://www.cartonpackagingmachinery.com WhatApp:+8613102721466 Email:shcartonmachine @163.com