Test method for surface water absorption of kraft linerboard

The water absorption tester can detect the water absorption index of kraft paper surface, which is mainly used in papermaking, packaging, printing and other manufacturers The production technology of kraft paper determines its strong water resistance and moisture resistance It is mainly used for manufacturing foreign trade packing cartons and domestic commodity packing cartons The following is a brief introduction to the surface water absorption test method of lower Kraft case paper I wave to you not far away in 2018, and half of December has passed in a flash 18 years have come Will spring festival be far behind? It seems that a wave of Spring Festival gift shopping frenzy is about to start! I don't know if my friends and I have the same "casual gift" as Xiaobian when they visit relatives and friends during the Spring Festival, mainly including wine, health food, beverage and other products Most of these gift boxes are made of kraft paper Compared with ordinary paper, kraft paper is more tenacious and compact, with high compressive strength, puncture strength and folding resistance, good moisture-proof performance and appearance quality Sanquan Zhongshi is a professional packaging material testing instrument manufacturer Kbxs-01, the company's water absorption tester, meets the relevant provisions of GB / t1540-2002 "paper and board water absorption test method" The following brief introduction is the scientific test method of water absorption on the surface of the lower Kraft case paper Test item of the water absorption tester of Kebo method: test the water absorption on the surface of the Kraft case paper with kbxs-01, the water absorption tester of the Kebo method of Sanquan Zhongshi, so that the enterprise can find a reasonable raw material ratio scheme Test executive standard: GB / t1540-2002 "paper and board Determination of water absorption" stipulates the water absorption on the surface of sizing paper and board Test principle: weigh the sample before the kraft paper test When one side of the sample contacts with water for a specified time, suck up the excess water on the sample and weigh it immediately The result is expressed in grams per square meter by the mass added to the sample per unit area Configuration of the water absorption tester of the cobble method; test area: 100 ± 0.2cm2; corresponding inner diameter: 112.8 ± 0.2mm; height of the metal cylinder: 50mm; resolution: 0.001j; width of the press roll: 200 ± 0.5mm; weight of the press roll: 10 ± 0.5kg; boundary dimension: 480 × 400 × 420 (mm); weight: 28KG There are two main types of water absorption tester, one is the flip type, the other is the flat pressure type Any one of them can be used Both instruments shall meet the following requirements 1 The metal cylinder is a cylinder with an internal cross-sectional area of (100 ± 0.2) cm2 and a corresponding internal diameter of (112.8 ± 0.2) mm If a small area cylinder is used, it is recommended that the area should not be less than 50 cm2 At this time, the volume of water should be reduced accordingly to ensure a water height of 10 mm The height of the cylinder is 50 mm, and the part of the cylinder ring contacting the sample shall be smooth and have enough roundness to prevent the edge of the cylinder from damaging the sample; 2 In order to prevent water leakage, a layer of elastic but non absorbent rubber pad or gasket shall be added to the inverted cylinder cover and the flat pressing base; 3 The roll width of metal press roll shall be (200 ± O.5) mm The mass shall be (10 ± 0.5) kg and the surface shall be smooth The test procedure of the water absorption tester (turnover test method) is as follows: 1 Cut 10 samples with a diameter of 125mm (5 on the front and back sides) 2 Before placing the sample, keep the cylinder ring and rubber pad in contact with the sample dry, and keep hands away from the test area 3 Pour 100ml of water into the cylinder, then place the qualified sample on the circular surface of the cylinder And the test is facing down Cover the gland on the specimen and clamp it to secure it to the cylinder 4 When the test time is determined, the time to remove the remaining water and the time to complete water absorption shall meet the requirements of Table 1 5 Turn the cylinder 180 ゜ and turn on the stopwatch at the same time 10-15 s before the end of water absorption, turn the cylinder to the right, loosen the gland clamping device, and take down the sample Note that after every 5 tests, the test water should be replaced to avoid affecting the test results 6 At the moment when the specified water absorption time is reached, put the sample that has been removed from the cylinder face down on the pre laid water absorption paper Put a piece of absorbent paper on the sample, and then immediately roll it back and forth in 4S with the metal pressure roller without any other pressure, and suck up the remaining water on the sample surface 7 Take out the sample quickly, fold the water absorption face in half, then fold it in half again, and weigh it to the accuracy of 0.001 G For the thick cardboard, the sample may not be easy to fold, in this case, the second weighing should be carried out as soon as possible The experimental results are expressed as follows: the amount of water absorbed by the surface of paper and paperboard per unit area under a certain pressure and temperature within a specified period of time, in g / ㎡ The specific formula is as follows: C = (g2-g1) × 100 Where: C-water absorption value; G2 - mass of sample after water absorption; G1 - mass of sample before water absorption Kebo method water absorption tester is developed and produced by Jinan Sanquan Zhongshi, which is simple in operation and high in cost performance.