Paperboard is usually composed of several layers of pulp combined, the binding force between the layers of cardboard in different production processes, different equipment and different technical worker conditions are different, according to the use of paper function, the requirements for the strength of different paper is also different.
Interlayer bond strength is an important index of cardboard, there are many factors affecting the internal bond strength of paper, summed up mainly as follows:
1, the beating degree of each layer of slurry is greatly different. Affecting the moisture of the slurry layer is inconsistent, and the foaming part generally appears after the pressure zone between the two slurry layers with a wide difference in beating degree.
2, the pressure of the roller line is improperly adjusted.
3, the amount of pulp on the net, the liquid level of the slurry on the net, the difference between the water level in the net and the water level outside the net is not properly controlled, the vacuum suction box is too low, so that when the moisture content of the wet paper formed by the slurry layer material is wide, the steam bubble will be produced in the net.
4, the mesh and the cloth local dirty or oil block, resulting in local dehydration and poor permeability, so that the air between the cloth and the paper. Water does not drain well. This situation mostly produces bubbles at the pre-pressure.
5. When there is a dent in the roller or mesh surface, excessive air and water will be brought in, and steam bubbles will be formed after pressure.
6, the roller suction scraper local jam, water cloth is not smooth or there is a hole, the pressed out of the water so that the wet paper page has a “tide” phenomenon, destroy the local interlayer combination, after the pressure area will produce bubbles, serious will embowel.
7. The drying temperature curve of the drying cylinder is not adjusted well, the temperature of the drying cylinder rises sharply, and the water vapor generated inside the cardboard can not escape very quickly, and stays between the paper layers with weak fiber binding force, resulting in the delamination of the cardboard.
Interlayer bond strength refers to the ability of paper or board to resist interlayer separation, which is a reflection of the internal bonding ability of paper.
The low bond strength between layers will cause problems with paper and board when printing with adhesive inks; If it is too high, it will bring difficulty to the production and processing of paper, and increase the cost of the company.
Drick internal bonding strength tester can help you solve this problem!
Instrument test principle: After the sample is affected by a certain Angle and weight, the energy can be absorbed, and indicates the peel strength between cardboard layers.
DRK182 Internal Bonding Strength Tester is mainly used for testing the peeling strength of paperboard, that is, the bonding strength between the fibers on the surface of paper. The equipment adopts the modern design concept of mechatronics, compact structure, beautiful appearance and easy maintenance.
Post time: Nov-25-2024
