national standards of People's Republic of China GB/T 6545—1998 Method for determination of burst strength of corrugated board Corrugated fibreboard—Determination of bursting strength 1 Scope This standard specifies the method for determining the burst strength of corrugated board by the hydraulic increase method. This standard applies to corrugated cardboard with a bursting resistance of 350 to 5500 kPa. 2 Reference standard The provisions contained in the following standards constitute provisions of this standard by reference in this standard. At the time of publication, the editions indicated were valid. All standards will be revised and parties using this standard should explore the possibility of using the latest version of the following standards. GB 450-89 paper and cardboard samples taken GB 10739—89 Standard atmosphere for processing and testing of pulp, paper and board samples 3 definition This standard uses the following definition. Bursting strength Under the test conditions, the corrugated board can withstand a uniform maximum pressure per unit area perpendicular to the surface of the sample. 4 Test principle Place the sample on the film, clamp it with the sample holder, and apply pressure evenly so that the sample and the film are free to bulge until the sample breaks. The sample burst strength is the maximum value of the applied hydraulic pressure. 5 test equipment 5.1 Sample chuck system The diameter of the upper chuck is (31.5±0.5) mm, and the diameter of the lower chuck is (31.5±0.5) mm. The upper and lower clamp rings should be concentric, and the maximum error should not exceed 0.25mm. The two clamping rings are parallel and flat to each other. The contact surface is evenly stressed during the measurement. In order to prevent the sample from slipping during the measurement, the sample chuck should have a clamping force of not less than 690 kPa. However, such pressure generally causes the corrugation of the specimen to collapse and should be noted in the report. 5.2 film The film is round and composed of an elastic material. The film is held firmly, and its upper surface is about 5.5 mm lower than the top surface of the lower clamp ring. The material and structure of the film shall be such that the height of the lower surface of the film protrudes from the elastic resistance, that is, when the protrusion height is 10 mm, the resistance range is (170 to 220) kPa; when the protrusion is 18 mm, the resistance range is It is (250 ~ 350) kPa. 6 sample taking and treatment 6.1 The sample shall be taken in accordance with the provisions of GB 450. 6.2 The sample shall be subjected to temperature and humidity treatment in accordance with the provisions of GB 10739. 7 Preparation of samples The area of ​​the sample must be larger than the chuck of the burst tester. The sample must not have watermarks, creases or obvious damage. Do not use specimens that have been pressed by the chuck during the test. 8 test steps Proof and test under the atmospheric conditions specified in 6.2. Open the chuck of the sample, clamp the sample in the middle of the two sample chucks, and then start the analyzer to gradually increase the pressure at (170 ± 15) mL / min. When the sample is blasted, read the value indicated on the pressure gauge. Then release the chuck and return the reading pointer to the starting position. The data should be discarded when the sample has a significant slip. 9 results indicate The measurement was carried out on each of the ten samples attached to the film on the front and back sides, and the arithmetic mean value (kPa) of all the measured values ​​was expressed. The main difference between the two: High-pressure burst strength instrument for paperboard, low-pressure burst strength instrument for paper. The motor is different, the upper and lower pressure plates are different, the rubber film is different, and the oil pressure rate is different. The other is the same! 1. Usually cardboard and kraft paper (hanger paper) is a high pressure burst strength tester with a speed of (170 ± 15) mL / min; The paper test instrument is a low pressure tester with a speed of 96 ± 6 mL / min. 2. The chuck size of the high pressure burst strength tester is slightly larger than the low pressure tester! 3, paper hardness test standard GB/T454-2002 "paper breakage determination" 70---14000KPA Cardboard Burst Test Standard GB/T1539-1989 "Dateboard Determination" 350---5500KPA Electronic cardboard burst tester NPD-3000 This cardboard endurance meter is a new generation of paper testing equipment developed by our factory. It adopts the measurement and control means with the single chip as the core, thus realizing the whole digitization and computerization of detection, control and data processing. All technical parameters and performance indicators are in line with ISO2759 "Determination of Cardboard Burst Resistance", QB/T1057 "Paper and Cardboard Burst Resistance Meter" and GB1539 "Cardboard Burst Resistance Measurement Method" and other standards and requirements. The instrument is simple in operation, reliable in performance and advanced in technology. It is an indispensable ideal equipment for scientific research units, paper manufacturers, packaging industry and quality inspection departments. Electronic Burst Tester Features: 1. The design of the whole machine is simple and compact, with small size and light weight; 2. Adopt synchronous motor drive. The transmission is smooth and accurate, making the output pressure more accurate; 3. This machine is equipped with a printer to make the experimental data eliminate the interference of human factors to the utmost extent. The main technical parameters: 1, induction mode: pressure converter 2, indication method: digital display 3. Capacity (selection): High pressure type 0～100 kg/cm 2 (accuracy 0.1kg/cm2) Low pressure type 0～16 kg/cm 2 (accuracy 0.1kg/cm2) 4, the ring diameter: Upper ring High pressure type Φ31.5mm, low pressure type Φ30.48mm Lower ring High pressure type Φ31.5mm, low pressure type Φ31.75mm 5, oil pressure gauge: 0 ~ 35 kg / cm 2 6, motor: AC220V 90W 7. Volume: about 53 cm × 23.5 cm × 57 cm 8, weight: about 65 kg 9, power: 1 ∮, AC220V, 1A 10, power water consumption: about 150W