QB/T 1671-1998 General technical requirements for special punching equipment for physical property testing of paper and paperboard
Some standard content:
QB/T1671—1998
Foreword
Because the physical property tests of paper and paperboard require the preparation of samples in advance. For test items where the sample size accuracy is sufficient to affect the test results, the preparation of samples must be completed with the help of punching equipment. This standard refers to the requirements for sample preparation in more than ten standards such as ISO1924, ISO1974, ISO535, ISO3037, etc., and determines the general technical conditions for products related to sample preparation equipment. The varieties and specifications of sample preparation equipment are complex and diverse. As a type of special equipment, it is beneficial to the serialization and standardization of product structure and to control product quality. This standard is different from the original industry standard QB/T1672-1992 "Paper Cutter". According to the properties of materials such as paper and paperboard, this standard proposes general technical conditions for the structural design of special equipment for cutting or punching such materials, the selection of cutters, size assurance, and the guarantee measures such as neat and lint-free cutting edges. The standard follows the three principles of purpose, maximum freedom and verifiability, and puts forward the basic conditions and requirements for controlling product quality performance.
This standard replaces QB/T1671-1992 and QB/T1672-1992 from the date of implementation. This standard is proposed by the Industry Management Department of the State Bureau of Light Industry. This standard is under the jurisdiction of the National Light Industry Machinery Standardization Center. The drafting units of this standard are: Sichuan Changjiang Papermaking Instrument Factory and National Paper Quality Supervision and Inspection Center. The main drafter of this standard is Lv Huiqing.
1 Scope
Light Industry Standard of the People's Republic of China
Physical Properties Test of Paper and Paperboard
General Technical Conditions for Special Punching Sample Equipment
QB/T 1671—1998
Replaces QB/T1671-1992
QB/T1672—1992
This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of special equipment for preparing paper and paperboard physical properties test specimens (hereinafter referred to as "punching equipment"). This standard applies to punching equipment for preparing standard size specimens for physical properties tests of sheet materials such as paper, paperboard, corrugated paperboard and tobacco flakes.
2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard was published, the versions shown were all valid. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest version of the following standards. GB/T 451.2-1989
Determination of basis weight of paper and paperboard
GB/T 451.3-—1989
Determination of thickness of paper and paperboard
GB/T 455.1-1989
Determination of tear resistance of paper
GB/T 455.2—1989
Determination of tear resistance of paperboard
GB/T456—1989 Determination of smoothness of paper and paperboard (Buick method)GB/T 457---1989
Determination of folding endurance of paper
GB/T 458—1989
Determination of air permeability of paper and paperboard (Schober method)GB/T 465.1--1989
Determination of the bursting strength of paper and paperboard after being immersed in water for a specified timeGB/T1538-1979
Determination of the folding resistance of paperboard (Schober type tester)GB/T 1540-1989
Determination of the water absorption of paper and paperboard (Cobber method)Determination of the permeability and crease water vapor permeability of paper and paperboard (disc method)GB/T2679.2-1995
GB/T2679.3-1995Determination of the stiffness of paper and paperboardGB/T2679.5-1995Determination of the folding resistance of paper and paperboard (MIT folding endurance tester method)GB/T 2679.8-1995
Determination of the ring crush strength of paper and paperboard
GB/T 5406—1985
Determination of oil permeability of paper
GB/T 6546--1986
Determination of edge compression strength of corrugated board
GB/T 6548—1986
Determination of adhesive strength of corrugated board
Determination of paper softness
GB/T 8942—1988
Determination of tensile strength of paper and board (constant rate of extension method)GB/T 12914--1991
GB/T14253—1993General technical conditions for light industrial machineryYC/T 16—1994
Tobacco flakes
3 Product classification
3.1 Varieties, specifications and applicable fields
Approved by the State Bureau of Light Industry on May 14, 1998
Implemented on March 1, 1999
QB/T 1671—1998
Punching tools are special tools for preparing standard size specimens in the physical properties test room of paper products. Their varieties and specifications should be divided according to the test items, specimen size and specimen shape. The varieties, specifications and applicable fields of punching tools should comply with the provisions of Table 1. Table 1 Variety and specification series
Specimen types and shapes
Paper and paperboard strip specimens
Paper and paperboard rectangular and
Square specimens
Paper and paperboard round specimens
Wabong paperboard rectangular specimens
Corrugated paperboard round specimens
General purpose cutters for paper and paperboard
3.2 Naming and model compilation
Specimen size series for punching tools
12 .7×152
15×100
15×140
15×150
15×250
25×250.50×250
38×70
40×63
50×63
50×50
60×100
100×100
$112.8(100 cm2)
25×80
25×100
$64. 02(32. 2 cm2)
$90. 62(64. 5 cm2)
15×300 (width×length)
300×360 (width×length)
Applicable fields
(Test items)
Ring compression strength test
Paper folding test
Paperboard folding test (MIT)
Paperboard folding test (Schober)
Tobacco sheet tensile folding test
Paper and paperboard tensile test
Paperboard tensile test
Paperboard stiffness test
Tobacco sheet tear test
Paper and paperboard tear test
Tobacco sheet tear test Water test
Air permeability test (Schober)
Softness, thickness, burst resistance and other tests
Moisture permeability (disc method) test
Quantitative determination and sheet burst resistance test
Water absorption, oil permeability test
Adhesion strength test
Edge pressure strength test
Flat compression strength test (small specifications)
Flat compression strength test (large specifications)
Standard paper cutter
Adjustable paper cutter
Cutting tools should have names that reflect their characteristics and exact models. Standard number for test items
GB/T 2679. 8
GB/T 457
GB/T 2679. 5
GB/T 1538
YC/T16
GB/T 12914
GB/T 12914
GB/T 2679. 3
YC/T16
GB/T455.1.GB/T455.2
YC/T16
GB/T458
YC/T 16.GB/T 8942
GB/T 451. 3.GB/T 465. 1
GB/T 2679.2
GB/T 451. 2.YC/T 16
GB/T 1540,GB/T 5406
GB/T 6548
GB/T 6546
ISO3035
General equipment
Punching equipment is highly specialized, and a specimen of one specification and size generally corresponds to one test item. The punching equipment is named according to the test item, cutting method and specimen shape. The punching equipment should be modeled according to its name and specification parameters, and the compilation of the model should comply with the relevant standards.
4 Technical requirements
4.1 Punching equipment should be manufactured according to product drawings, process documents and relevant standards approved by the prescribed procedures. 4.2 Punching equipment should take the basic size of the punching specimen as the main parameter, and the dimensional tolerance of the punching specimen and the thickness range of the specimen that can be cut as the main quantitative technical indicators of the product. Product design should be based on ensuring that the main parameters meet the requirements. The final use effect of the product is the main basis for evaluating the product structure and function.
QB/T 1671---1998
4.3 The objects of punching and cutting tools are paper and cardboard. Paper and cardboard are non-metallic materials composed of essential fibers and fillers. This material has low strength and compressibility. The tool material for punching and cutting this material should be carbon tool steel or low alloy tool steel. 4.4 The punching knife should have reasonable hardness and wear resistance. For paired tools, the hardness of the upper knife (or lower knife) with complex knife shape and poor manufacturing process should be slightly higher than the hardness of the lower knife (or upper knife) that is easy to process, HRC2~4. 4.5 The cutting edge of the punching knife should have a reasonable geometric angle to ensure the sharp edge. The reasonable punching clearance of the punching knife (a kind of blanking die) is an important link to ensure the accurate size of the workpiece, neat cutting edges and no linting. The punching clearance should be determined according to the relevant design specifications of the blanking die.
4.6 The thickness of the sample to be cut (or the number of layers of the sample to be punched when asked) is an important factor affecting the punching effect. Each punching tool for a specific purpose should specify a reasonable range of cutting thickness. 4,7 The physical property test of paper and paperboard requires that the sample has good directionality. In order to ensure the directionality of the sample to be cut, the punching tool should be equipped with a paper feeding guide mechanism and a positioning mechanism. The guide base surface of the guide mechanism should be perpendicular (or parallel) to the cutting edge, and the distance between the positioning surface (or point) of the positioning mechanism and the cutting edge should be stable and reliable.
4.8 The punching tool should be equipped with a guiding mechanism after the sample is dropped according to the different conditions of the overall structure, so as to facilitate the removal of the cut sample. 4.9 The operating mechanism of the punching tool should be advanced and reasonable, and the maximum operating force of the operating handle should comply with the provisions of Table 2 of GB/T14253. 4.10 The design of the punching tool should fully consider the safety of operation. Corresponding safety measures must be taken in all parts that may cause personal or equipment damage. Parts and components that may come loose during movement must be equipped with anti-loosening devices. 4.11 Punching equipment should be equipped with signs indicating steering, operation, lubrication, oil level, safety, etc. according to the different conditions of the overall structure. 4.12 The overall design of the punching equipment should be coordinated, beautiful, symmetrical, and harmonious, with a reasonable layout, moderate height, tight structure, and easy maintenance. 4.13 The appearance quality of the punching equipment should comply with the provisions of Chapter 6 of GB/T14253. 4.14 The accuracy classification of the punching tool should comply with the provisions of Table 2. Table 2 Accuracy level of punching and cutting equipment products
Basic size
Width a
Length L
Circle diameter d
Parallelism error of long sides
Vertical error of adjacent sides of square and rectangular specimens Note
Dimensional deviation and shape error of punching and cutting specimens, mm2 level
1 For long strip and rectangular specimens, the width and length should be selected according to the requirements of relevant test method standards, and a reasonable combination of fine spots should be selected. 3 level
2 For circular punching knives, if there is a precision requirement for the area of the punched specimen, the diameter of the punching knife can be appropriately relaxed to ensure that the area of the specimen is: 3 for universal adjustable distance cutters, the allowable error of the cutting size can be exempted from assessment. 4.15 The safety, hygiene, processing and assembly quality of punching and cutting equipment should comply with the provisions of GB/T14253. 5 Test methods
5.1 Inspection of working performance
The purpose of punching and cutting equipment is mainly to punch and cut samples. The inspection items of its working performance should include: checking whether the sample that meets the specified size requirements can be cut according to the operation method specified in the design, checking whether the operation mechanism works normally, whether the guide and positioning mechanism are reliable, whether the cutter is sharp, and whether the blanking guide mechanism works normally. 5.2 Inspection of the dimensional accuracy of cut samples
Real cut samples and measure the sample size.
QB/T 1671—1998
Take different varieties and different quantitative paper and paperboard, and actually cut them on the punching and cutting equipment. The cut test samples are measured by conventional methods to determine the actual size of their width, length or circular diameter. The actual size is compared with the nominal size to determine the dimensional error. 5.3 Inspection of nominal capacity
Take low-quantity thin paper and high-quantity thick paper or paperboard for trial cutting. Use thin paper to test the sharpness of the cutter, and use thick paper or cardboard to test the maximum thickness of the cut sample.
5.4--Inspection of general technical requirements
Perform actual measurement or visual inspection as required.
5.5 Requirements for various punching tools are different. Inspection should formulate an acceptance outline of inspection items and inspection methods according to their different specific requirements.
5.6 Inspection of punching tool products should comply with the relevant provisions of GB/T14253 Chapter 7 Test Methods. 6 Inspection Rules
Please follow the provisions of GB/T14253 Chapter 8.
7 Marking, packaging, transportation, storage
Please follow the provisions of GB/T14253 Chapter 9.Its width and length should be selected according to the requirements of the relevant test method standards, and a reasonable combination of fine spots should be selected. Level 3
2 For circular punching knives, if there is a precision requirement for the area of the punched sample, the diameter of the punching knife can be appropriately relaxed to ensure that the sample area is the same as that of the punching knife. 3 For universal adjustable distance cutters, the allowable error of the cutting size can be exempted from assessment. 4.15 The safety, hygiene, processing and assembly quality of punching tools should comply with the provisions of GB/T14253. 5 Test methods
5.1 Inspection of working performance
The purpose of punching tools is mainly to punch samples. The inspection items of its working performance should include: checking whether the sample that meets the specified size requirements can be cut according to the operating method specified in the design, checking whether the operating mechanism works normally, whether the guiding and positioning mechanism is accurate and reliable, whether the cutter is sharp, and whether the blanking guide mechanism works normally. 5.2 Inspection of the dimensional accuracy of cut samples
Real cut samples and measure the sample size.
QB/T 1671—1998
Take different varieties and different weights of paper and paperboard, and cut them on the punching tool. The test samples cut out are measured by conventional methods to determine the actual size of their width, length or circular diameter. The actual size is compared with the nominal size to determine the dimensional error. 5.3 Test of nominal capacity
Take thin paper with low weight and thick paper or paperboard with high weight for test cutting. Use thin paper to test the sharpness of the cutter, and use thick paper or paperboard to test the maximum thickness of the cut sample.
5.4—Test of general technical requirements
Perform actual measurement or visual inspection as required.
5.5The requirements of various punching tools are different. The inspection should formulate an acceptance outline of inspection items and inspection methods according to their different specific requirements.
5.6The inspection of punching tool products shall comply with the relevant provisions of Chapter 7 Test Methods of GB/T14253. 6 Inspection rules
Please follow the provisions of Chapter 8 of GB/T14253.
7 Marking, packaging, transportation and storage
Please follow the provisions of Chapter 9 of GB/T14253.Its width and length should be selected according to the requirements of the relevant test method standards, and a reasonable combination of fine spots should be selected. Level 3
2 For circular punching knives, if there is a precision requirement for the area of the punched sample, the diameter of the punching knife can be appropriately relaxed to ensure that the sample area is the same as that of the punching knife. 3 For universal adjustable distance cutters, the allowable error of the cutting size can be exempted from assessment. 4.15 The safety, hygiene, processing and assembly quality of punching tools should comply with the provisions of GB/T14253. 5 Test methods
5.1 Inspection of working performance
The purpose of punching tools is mainly to punch samples. The inspection items of its working performance should include: checking whether the sample that meets the specified size requirements can be cut according to the operating method specified in the design, checking whether the operating mechanism works normally, whether the guiding and positioning mechanism is accurate and reliable, whether the cutter is sharp, and whether the blanking guide mechanism works normally. 5.2 Inspection of the dimensional accuracy of cut samples
Real cut samples and measure the sample size.
QB/T 1671—1998
Take different varieties and different weights of paper and paperboard, and cut them on the punching tool. The test samples cut out are measured by conventional methods to determine the actual size of their width, length or circular diameter. The actual size is compared with the nominal size to determine the dimensional error. 5.3 Test of nominal capacity
Take thin paper with low weight and thick paper or paperboard with high weight for test cutting. Use thin paper to test the sharpness of the cutter, and use thick paper or paperboard to test the maximum thickness of the cut sample.
5.4—Test of general technical requirements
Perform actual measurement or visual inspection as required.
5.5The requirements of various punching tools are different. The inspection should formulate an acceptance outline of inspection items and inspection methods according to their different specific requirements.
5.6The inspection of punching tool products shall comply with the relevant provisions of Chapter 7 Test Methods of GB/T14253. 6 Inspection ruleswwW.bzxz.Net
Please follow the provisions of Chapter 8 of GB/T14253.
7 Marking, packaging, transportation and storage
Please follow the provisions of Chapter 9 of GB/T14253.
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