What are the most popular paperboard bonding testi

2022-08-07
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What are the quality tests of the paperboard adhesion tester for adhesives?

the paperboard adhesion tester (edge pressing and ring pressing tester) can cooperate with a variety of materials for all-round testing. In terms of paper packaging materials, it carries out a variety of paper quality tests, including five tests, namely, ring pressing (RCT), flat pressing (FCT), edge pressing (ECT), adhesion (PAT) and general compression resistance (CM once opened the speaker T). It is a testing machine with multiple functions. So what are the important indicators in the adhesion test? Listen to Kunshan Haida instrument for the following analysis

the adhesive strength mainly depends on the quality of the adhesive, and there are five factors that determine the quality of the adhesive. The annual total demand for solid content and initial adhesion of PP film materials in China is about 3.6 million tons. The viscosity and gelatinization temperature are important indicators to measure the quality of adhesives:

1 Solid content

the solid content of the adhesive shall be determined according to the equipment accuracy, operation speed and the actual situation of the base paper. Once the speed of the high-speed wide width corrugated board production line reaches more than 200 m/min, the solid content of the adhesive must be high. The ratio of water to starch is usually 2.5:1 to avoid affecting the imaging quality between 3:1. The high solid content of the adhesive will reduce the water content relatively, and less glue amount can ensure the adhesion of the corrugated board; In addition, the moisture content changes little during the processing of corrugated board, which can reduce the warpage of corrugated board. If the equipment precision of the enterprise is low, the speed is slow, and the base paper is easy to penetrate, the solid content of the adhesive should be lower, otherwise it will cause quality problems such as degumming of corrugated board, line pasting crystallization and line bursting. Test with cardboard adhesion tester hd- and adjust according to the results

2. Initial adhesion

initial adhesion is the key to ensure the adhesion of corrugated board and improve the speed. In the production of corrugated board, increasing the preheating area of base paper, or adding cross-linking agent in the production of adhesive, adding borax in the main body and carrier tank respectively, and increasing the solid content of adhesive can make the adhesive begin to produce adhesion within a short time after coating, and its adhesion can damage the paper fiber 2 Jaw quality is too poor

3. Viscosity

the lower the viscosity of the adhesive, the better the fluidity. The fluidity of adhesive determines the permeability of adhesive, the uniformity of adhesive application and the amount of adhesive, and directly affects the speed, the adhesion of paperboard, the flatness and strength of paperboard. In addition, the higher the proportion of starch in the binder, the worse the fluidity; The adhesive with high solid content can also maintain very low viscosity by adjusting the preparation process. Under normal circumstances, the viscosity of the adhesive will decrease when it passes through the circulating pump once in the recycling process. At this time, the newly made adhesive shall be mixed for use. Cardboard adhesion tester hd- can be used to test

4. Gelatinization temperature

gelatinization temperature refers to the initial temperature required to turn starch adhesive into paste. The gelatinization temperature of adhesive is the key factor to maintain high-speed production. To solve the problem of gelatinization temperature of adhesive, in addition to adjusting the amount of caustic soda and heating, proper addition of some additives can also achieve the same effect. The gelatinization temperature should not be too low, otherwise it will cause the adhesive to gelatinize in the circulation process and affect the fluidity of the adhesive. The gelatinization temperature of the adhesive shall be adjusted according to seasonal changes. In winter, the gelatinization temperature can be reduced to 5560 ℃, and in summer, the gelatinization temperature can be increased to 61 ℃ 66

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