We all know that the wet end of the paper machine is easy to break. Therefore, the water filtration capacity of the pulp and the dewatering ability of the paper machine have always been the focus of attention. Even if it enters the drying section, there is still the possibility of the page break, which cannot be ignored. Let's take a look at the reasons why the dryer section may cause the paper to break.
The wet paper sheet entering the drying section has reached a dryness of more than 32% and has a certain strength. However, there will be a broken head in the drying section.
There are several main reasons for the broken head:
⑴ 〠The strength of the paper itself is not enough or there are weak points
For example, when the moisture of the paper is too large, and the knots of the dry cloth are irregular, it is easy to press the knots on the paper, causing weak points and breaking the paper;
The paper sheet breaks in the press section. In severe cases, it breaks when the tension is high in the late drying period, or there are horizontal cracks and holes in the wet section of the sheet, which can also cause the sheet break in the drying section;
When the basis weight of the paper fluctuates, the drying speed will be inconsistent. The basis weight of the paper is small, and it dries quickly. Therefore, it is easy to dry and cause the paper to shrink too much and break at the end of the drying. When this happens, it should be resolved for specific reasons.
⑵, the tension of the paper is too large, causing a broken head
There are two reasons for the excessive tension of the paper:
First, the transmission ratio between each group of dryers is too large, often when the paper is collected in the late drying period, it will break, or the transmission components have problems, such as belt slippage, irregular gears, etc., causing tension fluctuations. Will cause a broken head. Therefore, it is very important to pay attention to adjust the tension between the dryers, and pay attention to the working decoration of the transmission at any time.
Second, the temperature of the drying cylinder is too high. In the initial stage of drying, the broken head caused by the above-mentioned sticky cylinder will occur. In the drying process, the paper sheet will be over-dried, causing the paper sheet to shrink sharply and break. Sometimes even the head breaks for a long time, and the cylinder temperature rises because the heat is not transferred to the paper for a long time, and this type of head break can also occur when the paper is transferred again. Therefore, the "seeing steam" in the dryer section should always pay attention to the steam pressure and the temperature change of the dryer.
⑶, debris in the dryer cylinder caused the paper to break
When there is a broken head, the clean damaged paper is not processed. When the paper sheet passes between the dry cloth and the dryer, it is easy to break the paper sheet and break the head; when the scraper is not strict and the paper foam is leaking, it is easy to get stuck on the edge of the paper First, the edge of the paper is damaged, causing a broken head in the late drying period; some sticky substances brought by the broken paper in the paper material will also stick to the cylinder surface and cause a broken head. Therefore, after breaking the head, pay attention to clean the damaged paper with compressed air, and at the same time often pay attention to remove the paper foam at the scraper, and pay attention to the working condition of the scraper.
â‘· Broken head caused by dry cloth
Pleating the dry cloth will cause the paper sheet corresponding to the pleats to dry poorly due to poor contact with the drying gap, causing it to break between the dryer and the calender; the dry cloth joint is rough, which is easy to crush the paper sheet and produce Broken heads; oil and resin stick to the dry cloth, which will stick to the paper sheets; even the canvas is threaded and flicked, and the paper edges will be opened, causing the full width to break. Therefore, in normal work, you should always observe the working condition of the dry cloth, and find the problem and solve it in time.
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