This situation is very common on corrugated cardboard produced by a single-sided machine with guide jaws, which is also a serious problem for cardboard production. Because the cartons made of such cardboard often break when used. The decrease in compressive strength of cartons is often the result of this. These guidewires often break due to weak compressive strength. A leader wire is actually a very clear blank mark without glue, usually due to the bending, wear, position of the guide jaws is not centered or over-tightened, and the paste accumulates and hardens on the baffle. These condensations The starch will rub off the good paste on the roller, and then it will form a lead line or no trace of glue. Other possible causes are: the core paper is too wet, the paste roller has a too wide groove (caused by abrasion), or sometimes as shown on the left of the photo below, there is a very wide section of paste from the top wipe. It can also be seen from the figure that the speed is obviously problematic and there are two wet marks. At the left end of the picture, it can be seen that the glue on the top roller is wiped off.
