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A brief introduction to the test method of paper tensile strength

Date: 2021-12-22 09:34
Views: 1185
Abstract:

A brief introduction to the test method of paper tensile strength

Principle of tensile strength testing machine:
The tensile strength tester, under the condition of constant speed loading, stretches the specified size sample to fracture, measures its tensile strength, and records the * large elongation at fracture

Definition of tensile strength:
Tensile strength: under the conditions specified in the standard test method, the tensile strength per unit width of paper or paperboard before fracture, expressed in s, in kn / mm

Definition of tensile index:
Tensile index: tensile strength divided by quantitative, expressed by I, in n.m/g

Definition of exercise elongation:
Elongation at break: under the conditions specified in the standard test method, measure the elongation at break of the specimen, expressed in mm Then calculate the percentage of elongation at break to the length of specimen before stretching Result * * to one decimal place

A brief introduction to the test method of paper tensile strength
1. Instrument
The tensile strength testing machine shall be able to act on the sample under the specified constant speed loading to determine the tensile strength and elongation of the sample For example, Jinan Chenchi wdk-01 electronic tensile testing machine meets the test requirements of GB 455 paper and paperboard tensile strength test (constant speed loading method)
2. Sample preparation
Samples shall be taken according to GB / T 450 At a distance of 15mm away from the edge of the sample, enough samples are cut at a time to ensure that there are 10 valid data in the longitudinal and transverse directions There should be no paper defects affecting the strength of the sample The two sides of the sample are straight, the parallelism should be within 0.1 mm, and the cut should be neat without any damage When cutting soft tissue paper, use hard paper to pick up the sample for cutting The width of the specimen shall be (15 ± 0.1) mm. When other widths are used, it shall be indicated in the report. The specimen shall be of sufficient length to ensure that the specimen between the clamps will not be touched. Generally, the * short length of the specimen is 250mm, and the clamp distance shall be 180mm during the test. If other clamp length is used, it shall be indicated in the report
3. Constant humidity treatment
The sample shall be treated with constant humidity according to GB / T 10739
4. Experimental steps
Adjust the distance between the upper and lower clamps, clamp the specimen in the fixture, and prevent hand contact with the test area between the clamps A pretension of about 98 Mn (10 g) is applied to the specimen so that the specimen is clamped vertically between the clamps
The loading rate of specimen fracture in (20 ± 5) s was calculated by pre test
The applied * large force shall be recorded from the beginning of measurement to the time of specimen fracture When required, the elongation at break shall be recorded
At least 10 strips shall be measured in each direction of paper and board, and the results of these 10 strips shall be valid If it is broken within 10 mm from the fixture, it should be discarded
5. Expression of results
The results obtained by calculating and representing the vertical and horizontal directions of the paper respectively The standard deviation of the calculated results
6. Recommended instruments
Jinan Chenchi instrument wdk-01 paper tensile strength testing machine( Paper tensile testing machine


This paper describes the test method of paper tensile strength Jinan Chenchi Test Instrument Co., Ltd. is called Chenchi instrument, Jinan Chenchi, specializing in the production of tensile testing machines, Viscosity tester Film friction coefficient tester , peel tester, whiteness tester, quantitative sampler, paper tensile strength tester, electronic compression tester, Sealing tester Such as adhesive testing instruments, paper and paper packaging testing instruments, plastic and plastic packaging testing instruments.