![]() ![]() Do not add any moisture to the paper.Ħ) The paper after the preheating of moisture loss time is insufficient, or the environment humidity, poor ventilation, improper speed of the Fuli production line.ħ) Single side corrugated machine, glue machine on the amount of improper, uneven, and cause uneven shrinkage rate of cardboard.Ĩ) Insufficient steam pressure, instability, steam trap and other accessories damage or pipe water is not clean, leading to the pre-heater can not work normally and steadily.I often get asked about the functional differences between the direct and indirect warping method for rigid heddle looms. ![]() Former operation is improper leads to latter equipment limitation, resulting in affecting preheat drying effect.ĥ) Do not use the vapor spray device correctly, or there is no spray device on the device. The moisture content of one part of the paper is different from that of the other part, or the two ends ofthe paper, the outer edge and the inner core.Ĥ) Paper by thepre-heater (wrap Angle) heating surface length selection and adjustment is not appropriate, or (wrap angle) heating surface length can not be arbitrarily adjusted. Second, the quantity of liner board is less than inner linerboard, the moisture content of linerboard is greater than inner linerboard, or the moisture content of linerboard is less than inner linerboard.ģ) The moisture content of the same batch of paper is different. ![]() Or moisture content of liner board is less than theinner linerboard. The moisture content of linerboard is greater than inner linerboard. One is the quantity of linerboard is greater than inner linerboard. (3) The quantity and moisture content are both different. Some moisture content of linerboard are larger than inner linerboard, some are smaller. Due to the differences of supplier, transportation inventory and other environmental humidity. Some quantity of linerboard are larger than inner linerboard, some are smaller. From the perspective of carton performance or the user's cost reduction, the linerboard and inner linerboard are required to be different, usually: According to the paper onthe material, generally, linerboard is better than inner linerboard.Ģ) The main technical parameters of the linerboard and inner linerboard are different. Kraft paper, imitation kraft paper, corrugated paper, tea board paper, high strength corrugated paper etc, and they are divided into A, B, C, D, E class. The Main Reasons Affecting the Flatness of Cardboardġ) Different types and grades of linerboard and inner linerboard. Linerboard surface arch is called a positive arch, inner linerboard surface arch is called a negative arch, linerboard and inner linerboard fluctuating respectively are called positive and negative arch.Ģ. Arbitrary arch is that rises and falls in any direction. Longitudinal arch, is refers to the cardboard along the production line speed direction ofthe arch. Transverse arch, it is to point to the arch that produces along corrugated direction. Poor flatness of the appearance of corrugated board is generally divided into three kinds: transverse arch, longitudinal arch and arbitrary arch. Here is a rough summary of the following, only for reference.ġ. In order to improve the flatness of corrugated board, ensure the product quality pass rate and normal production efficiency, we constantly test and analyze the carton production practice, and explore some improved methods. In short, the flatness of the cardboard will make it in convenient to feed and cause secondary waste in the production process.
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