Some standard content:
QB/T1667--1998
This standard adopts the technical contents of ISO5636-1:1984 (confirmed in 1989-08) "Paper and paperboard-Determination of air permeability (medium range)-Part 1: General method" and ISO5636-2:1984 (confirmed in 1989-08) "Paper and paperboard-Determination of air permeability (medium range)-Part 2: Schober method" in a non-equivalent manner. There are many methods and test instruments for the air permeability test of paper and paperboard, such as Gurley method, Sheffield method, Potts method, Bendtsen method, Schober method, etc. The content specified in this standard is the Schober type air permeability tester designed based on the principle of Schober method. This standard adopts some important technical contents of test instruments in relevant international standards, and improves the technical contents of the original light industry standard QB/T1667-1992 "Paper Permeability (Schober Method) Tester". This standard will replace QB/T1667-1992 from the date of implementation. Appendix A of this standard is the appendix of the standard.
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: Sichuan Changjiang Papermaking Instrument Factory, National Paper Quality Supervision and Inspection Center. The main drafter of this standard: Lv Huiqing.
1 Scope
Light Industry Standard of the People's Republic of China
Air Permeability Tester for Paper and Paperboard
QB/T1667—1998
Replaces QB/T1667.1992
This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of air permeability testers for paper and paperboard.
This standard applies to the Schober air permeability tester (hereinafter referred to as the "air permeability tester") designed based on the principle of the Schober test method and used for air permeability testing of paper and paperboard in a medium permeability range. The periodic technical status inspection of the air permeability tester during use should also be used as a reference. Note: The definition and calculation of air permeability are shown in Appendix A (Appendix to the standard). 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards are subject to revision, and parties using this standard should explore the use of the following standards for the most appropriate use. Possibility of new version. GB191-1991 Pictorial mark for packaging storage and transportation
GB/T458-1989 Method for determination of air permeability of paper and paperboard (Schober method) GB/T13306-1991 Label
GB/T14253-1993 General technical conditions for light industrial machinery QB/T1588.5-1996 General technical conditions for packaging of light industrial machinery IS()5636-1:1989 Paper and paperboard-Determination of air permeability (medium range)-Part 1: General method 3 Product classification
Classification of air permeability instruments by structural type , the Schober air permeability meter is a commonly used type among various structural types. The model compilation of the air permeability meter should comply with the relevant national standards or industry standards. 4 Technical requirements
4.1 Working conditions
a) Room temperature 10℃～35℃;
b) The workbench is stable and the table surface is flat;
c) The instrument should work under the condition that the horizontal and vertical references are correct and reliable; d) The environment is clean and free of vibration.
4.2 Basic requirements for air permeability meters
Any type of air permeability meter that uses ISO5636-1 to measure the air permeability of paper and paperboard All must meet the following basic requirements: a) relative error of gas volume ±2%; b) relative error of ventilation time ±1%; c) relative error of air flow ±5%; d) accuracy of initial pressure difference between the two sides of the sample ±2%, and the change of pressure difference during measurement should not exceed ±5% of the rated value; e) after the sample is clamped, the change of the sample ventilation area due to deformation of the sealing gasket should not exceed 1% of the rated area; approved by the State Bureau of Light Industry on May 14, 1998, implemented on March 1, 1999, QB/T 1667 - 1998
f) Air permeability area 10cm2, air permeability area error ±2%; g) Sealing: Any leakage must be less than 2.5% of the lower limit of the range; h) When water is used as the displacement medium, the direction of the air flow penetrating the sample should be such that the sample does not come into contact with water before air permeation. 4.3 The Palmer type air permeator is a structural type that meets the requirements of 1S05636-1. Regardless of the structural characteristic parameters and technical indicators proposed in any narrative form, their substantive content should be consistent with the requirements of 4.2. 4.4 The U-type pressure gauge of the air permeator shall comply with the provisions of Table 1. Table 1 U-type pressure gauge
Glass U-type tube
Outer diameter 10
Inner diameter 8
Parallelism of straight tube
Main scale, kPa
Scale range
4.5 The clamping mechanism and air permeability holes of the air permeator sample shall comply with the provisions of Table 2. Double scale
Auxiliary scale, mm
Resolution
Full scale error
±0. 2%(FS)
(±0. 005 kPa)
Table 2 Sample clamping mechanism and air holes
Characteristic dimensions and requirements
Center hole diameter of upper and lower clamp rings, mm
Standard specifications
$35.68±0.05
Special specifications
$15.95±0.05
Center hole of upper and lower clamp rings
Coaxiality, mm
Note: The air permeability area of special specifications is suitable for the permeability measurement of cigarette paper. 4.6 Glass measuring cylinder for volume replacement
Sealing gasket requirements
Low elastic hardness:
Shore 70～80
Graduation line
Air permeability area, cm2
Standard specifications
Special specifications
The permeable measuring cylinder is an important supporting instrument. The volume of gas passing through the sample is measured by the gas-water replacement method. The volume of water is read from the scale of the measuring cylinder. The volume of air passing through the sample should be equal to the volume of water replaced. The specifications of the measuring cylinder used for the permeability meter should comply with the provisions of Table 3.
Table 3 Matching glass measuring cylinder
Large cylinder, ml.
Capacity 1000 (person-sized)
Division value
Volume error
Capacity 500 (person-sized)
Division value
Note: The number of matching measuring cylinders is 1000, 500, and 250ml. 4.7 Test system tightness
Reading with a small measuring cylinder, mL
Capacity 250 (person-sized)
Volume error
Division value
Volume error
The permeability test system is composed of a sample clamping mechanism, a U-shaped pressure gauge, a water glass cylinder, valves, and connecting pipes. The system tightness should meet the following requirements: Add a smooth metal circular plate between the upper and lower clamp rings, then press the upper clamp ring, adjust the internal and external pressure difference of the system to 1kPa, and close all valves. After 30 minutes of inactivity, the pressure drop indicated on the pressure gauge should not exceed 0.01 kPa (i.e., one small grid on the scale of the pressure gauge).
4.8 The operating system of the permeability instrument should be flexible, labor-saving, and reliable in tightening or loosening the adjustment handles and operating control handles. 233
QB/T 1667—1998
4.9 The safety, sanitation, processing, and appearance requirements of the permeability instrument should comply with the provisions of GB/T14253. 5 Test methods
5.1 Standard instruments and tools for testing
The standard instruments and tools used for the inspection (verification) of the permeability instrument shall include: a) a three-level industrial balance;
b) an electronic stopwatch with a resolution of 0.01s;
c) a vernier caliper with a graduation value of 0.02mm;
d) a special gauge for coaxiality inspection;
e) a special metal circular plate for sealing inspection;
f) other general tools.
5.2 Test conditions
The test shall be carried out under the conditions specified in 4.1. 5.3 Inspection principles for the basic requirements of 4.2
5.3.1 The volume of gas is measured by an indirect method. Through gas-water replacement, the water in the container is replaced by the same volume of air, and the replaced water is collected by a measuring cylinder. The volume of water is indicated by the scale indication of the measuring cylinder. The volume error of the measuring cylinder is considered to be the error of the gas volume.
5.3.2 The error of the ventilation time is determined by the electronic second indication value used in the test. The error of the stopwatch indication value is considered to be the error of the ventilation time. 5.3.3 The air flow rate refers to the volume of gas flowing per unit time. The error of the flow rate is determined by the errors of the two parameters of gas volume and ventilation time.
5.3.4 For 4.2d) e), f) g), h) are measured and checked as required. 5.4 Inspection of 4.4 U-type pressure gauge
5.4.1 The size of the glass U-tube and the parallelism of the straight tube are measured and checked with a vernier caliper. When checking the parallelism of the straight tube of the U-tube, the measurement positions should be selected at the upper, middle and lower positions on the inner side of the U-tube. The difference between the maximum and minimum values of the measured distances at the three positions is the parallelism error. 5.4.2 The indication of the U-type pressure gauge is checked by measuring the water head height. The U-type pressure gauge is checked by the metrology department before assembly.
5.5 The sample clamping mechanism of the permeability instrument is checked by actual measurement according to the requirements of Table 2. 5.6 The glass measuring cylinder of the permeability instrument is weighed and checked on the balance according to the requirements of Table 3. The measuring cylinder is checked by the metrology department before assembly.
5.7 Inspection of the sealing of the test system in 4.7 is checked by actual measurement as required.
5.8 4.8 and 4.9 shall be inspected by actual measurement or visual inspection as required. 6 Inspection rules
6.1 The factory inspection of the air permeability instrument shall be fully inspected in accordance with this standard. 6.2 The main measurable performance indicators of the air permeability instrument must all meet the requirements of this standard, and the unqualified items of non-measurable general performance are allowed to be repaired to meet the requirements.
Note: Non-measurable general performance refers to the surface quality and non-quantitative indicators that do not affect the metrological performance of the whole machine. 6.3 Sampling re-inspection shall be carried out before the air permeability instrument is packed and put into the warehouse. The re-inspection rules are as follows: a) Stratified random sampling is adopted for re-inspection;
b) The qualified judgment number of re-inspection is zero;
c) The re-inspection sample is 10% of the inspection batch, and the decimal of the number of sampling units is rounded up to an integer. When the batch is less than 20 units, the sample should be no less than 3 units, and when the batch is less than 10 units, the sample should be no less than 2 units; 234
QB/T1667—1998
d) The samples shall be checked item by item according to the requirements of this standard. If unqualified products appear in the samples, a second extended sampling shall be carried out, and the proportion of extended sampling shall be 20% of the inspection batch (excluding the samples taken for the first time). If unqualified products appear again in the second sampling, the whole batch shall be rejected, and the batch shall be reassembled for inspection after being sorted out and reworked.
6.4 The measured data of the main items of the factory inspection of the air permeability instrument shall be recorded in the random documents. Without the documents proving the qualified quality of the product, the product shall not leave the factory.
7 Marking, packaging, transportation and storage
7.1 Marking
7.1.1 Product marking
The air permeability instrument shall be marked with a label, and the label shall comply with the provisions of GB/T13306. The label is made of copper or aluminum, and the content includes: a) manufacturer name; b) product name, model and trademark; c) main technical parameters of the product; d) product quality level and mark; e) manufacturing date, number or production batch number. 7.1.2 Packaging mark The product packaging mark shall comply with the provisions of GB191. The outer surface of the product packaging box shall have text and symbol marks, including: a) product name; b) manufacturer name, address and postal code; c) shipping and receiving mark and factory year and month; d) box number; e) precision instrument, handle with care, moisture-proof, sun-proof, upright direction symbol; f) gross weight. 7.2 Packaging 7.2.1 Product packaging shall comply with the provisions of QB/T1588.5. 7.2.2 The accompanying documents shall be complete and the contents of the documents shall be accurate. The accompanying documents shall include the product certificate of conformity, the metrological verification certificate, the product instruction manual and the packing list.
7.3 Transportation
The packaged products shall comply with the relevant documents of the railway, land, water and other transportation departments during transportation. The transportation requirements shall be specified for products with special requirements.
7.4 Storage
The products shall be stored in a dry, ventilated and rainproof place and shall be placed stably. During the specified storage period, the products shall not rust. 235
A1 Introduction
QB/T1667—1998
Appendix A
(Standard Appendix)
Definition and Calculation of Air Permeability
The Schaubel-type paper and paperboard air permeability tester specified in this standard can measure the volume of air (ml) that passes through the paper surface under specified conditions. The air volume is not the air permeability defined in the international standard. Therefore, the air volume must be converted into the air permeability value according to the formula before the test work is considered completed. The definition of air permeability and the calculation formula specified in this appendix seem to have little to do with the manufacture of the air permeability tester, but they are meaningful for a comprehensive understanding and knowledge of the air permeability tester.
A2 Definition and Unit of Air Permeability
International Standard ISO5636-2 adopts the following definition: Air Permeabilitybzxz.net
The average air flow rate per unit area of paper and paperboard under specified conditions, unit time and unit pressure difference, expressed in micrometers/(Pascal·second).
A3 Air permeability calculation formula
Schober air permeability, μm/(Pa·s); where: Ps—
V-the volume of air that passes through the sample within a specified time, mL; AP—the pressure difference between the two sides of the sample during the test, kPa; the actual air permeability time during the test, S.
A4 Conversion relationship between milliliter unit and micron unit 1 mL/(m2- Pa-s)=-1 μm/(Pa - s)A5 The air permeability measurement range of the air permeability meter in international standard defined units (medium range) 1x10-2μm/(Pas)~1x10\μm/(Pa·s)2362 The accompanying documents should be complete and the contents of the documents should be accurate. The accompanying documents should include product certificates, metrological verification certificates, product instructions and packing lists.
7.3 Transportation
The packaged products should comply with the relevant documents of the railway, land, water and other transportation departments during transportation. The transportation requirements should be specified for products with special requirements.
7.4 Storage
The products should be stored in a dry, ventilated and rainproof place and should be placed stably. During the specified storage period, the products shall not rust. 235
A1 Introduction
QB/T1667—1998
Appendix A
(Standard Appendix)
Definition and Calculation of Air Permeability
The Schaubel-type paper and paperboard air permeability tester specified in this standard can measure the volume of air (ml) that passes through the paper surface under specified conditions. The air volume is not the air permeability defined in the international standard. Therefore, the air volume must be converted into the air permeability value according to the formula before the test work is considered completed. The definition of air permeability and the calculation formula specified in this appendix seem to have little to do with the manufacture of the air permeability tester, but they are meaningful for a comprehensive understanding and knowledge of the air permeability tester.
A2 Definition and Unit of Air Permeability
International Standard ISO5636-2 adopts the following definition: Air Permeability
The average air flow rate per unit area of paper and paperboard under specified conditions, unit time and unit pressure difference, expressed in micrometers/(Pascal·second).
A3 Air permeability calculation formula
Schober air permeability, μm/(Pa·s); where: Ps—
V-the volume of air that passes through the sample within a specified time, mL; AP—the pressure difference between the two sides of the sample during the test, kPa; the actual air permeability time during the test, S.
A4 Conversion relationship between milliliter unit and micron unit 1 mL/(m2- Pa-s)=-1 μm/(Pa - s)A5 The air permeability measurement range of the air permeability meter in international standard defined units (medium range) 1x10-2μm/(Pas)~1x10\μm/(Pa·s)2362 The accompanying documents should be complete and the contents of the documents should be accurate. The accompanying documents should include product certificates, metrological verification certificates, product instructions and packing lists.
7.3 Transportation
The packaged products should comply with the relevant documents of the railway, land, water and other transportation departments during transportation. The transportation requirements should be specified for products with special requirements.
7.4 Storage
The products should be stored in a dry, ventilated and rainproof place and should be placed stably. During the specified storage period, the products shall not rust. 235
A1 Introduction
QB/T1667—1998
Appendix A
(Standard Appendix)
Definition and Calculation of Air Permeability
The Schaubel-type paper and paperboard air permeability tester specified in this standard can measure the volume of air (ml) that passes through the paper surface under specified conditions. The air volume is not the air permeability defined in the international standard. Therefore, the air volume must be converted into the air permeability value according to the formula before the test work is considered completed. The definition of air permeability and the calculation formula specified in this appendix seem to have little to do with the manufacture of the air permeability tester, but they are meaningful for a comprehensive understanding and knowledge of the air permeability tester.
A2 Definition and Unit of Air Permeability
International Standard ISO5636-2 adopts the following definition: Air Permeability
The average air flow rate per unit area of paper and paperboard under specified conditions, unit time and unit pressure difference, expressed in micrometers/(Pascal·second).
A3 Air permeability calculation formula
Schober air permeability, μm/(Pa·s); where: Ps—
V-the volume of air that passes through the sample within a specified time, mL; AP—the pressure difference between the two sides of the sample during the test, kPa; the actual air permeability time during the test, S.
A4 Conversion relationship between milliliter unit and micron unit 1 mL/(m2- Pa-s)=-1 μm/(Pa - s)A5 The air permeability measurement range of the air permeability meter in international standard defined units (medium range) 1x10-2μm/(Pas)~1x10\μm/(Pa·s)236
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.