Some standard content:
Record number: 2808-1999
HG/T3077-1999
This standard is equivalent to the international standard IS06123-1:1982 "Rubber or plastic coated roller specification part 1: hardness requirements", and is revised from the chemical industry standard HG/T3077--1988 "Rubber roller hardness requirements". It is equivalent to the international standard in technical content and has no difference with HG/T3077-1988, but the following editorial changes have been made: the standard name has been changed to "Rubber and plastic roller hardness requirements"; the appendix content has been deleted, and the corresponding hardness test method standards have been added. In accordance with the principle of coordination and consistency with the referenced standards, three hardness expression methods have been unified and standardized to simplify the standard content; individual translation errors in HG/T3077--1988 have been corrected. This standard will replace HG/T3077--1988 from the date of its entry into force. This standard was proposed by the Technical Supervision Department of the former Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Rubber Products Branch of the National Rubber Standardization Committee. The main drafting unit of this standard is Beijing Rubber Products Design Institute. The participating drafting units of this standard are Jizhou Rubber Roller Factory of Hebei Province and Wuxi Sixth Rubber Factory. The main drafters of this standard are Gao Qian, Huang Tianye and Zhu Xiaofeng. This standard was first issued as a national standard in 1988, and was adjusted to a recommended chemical industry standard in 1998 and renumbered. 358
HG/T3077—1999
Former ISO
ISO (International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of developing international standards is usually carried out by ISO technical committees, and any member body interested in the subject of an established technical committee has the right to participate in the committee. International organizations, both governmental and non-governmental, in contact with ISO, may also participate in this work. ISO works closely with the International Electrotechnical Commission (IEC) on all aspects of electrotechnical standardization. Draft international standards adopted by technical committees are circulated to member bodies for voting. International Standard ISO6123-1 was developed by ISO/TC45 Rubber and Plastics Technical Committee and sent to member bodies in January 1981. The following national member bodies have agreed to this International Standard: Australia
Austria
Belgium
Canada
Czechoslovakia
Federal Republic of Germany
Hungary
Italy
Democratic People's Republic of Korea
Portugal
Romania
The following national member bodies have not agreed to this International Standard: France
Republic of South Africa
Spain
Sri Lanka
Chemical Industry Standard of the People's Republic of China
Requirements for hardness of rubber or plastics covered
HG/T 3077—1999
idt ISO 6123-1 : 1982
Replaces HG/T3077—1988
Requirements for hardness of rubber or plastics covered Rubber and plastic rollers (hereinafter referred to as rubber rollers) are made of a cylindrical metal roller core covered with rubber or plastic. According to the requirements of use, rubber rollers of various sizes and hardness grades can be made. ScopewwW.bzxz.Net
This standard specifies the hardness requirements of rubber rollers. 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 will be revised, and the parties using this standard should explore the possibility of using the latest version of the following standards. GB2941-1991 Standard temperature, humidity and time for environmental conditioning and testing of rubber specimens (eqvISO471:1983) HG/T2413.1—1992 Determination of apparent hardness of rubber rollers-PJ hardness tester method (eqvISO7267-3:1988) HG/T2413.2-1992 Determination of apparent hardness of rubber rollers-Shore hardness tester method (idtISO7267-2:1986) HG/T2450--1993 Determination of apparent hardness of rubber rollers-Rubber international hardness tester method (idtISO7267-1:1986) 3 Hardness regulations
One of the following hardnesses can be selected as the hardness of the rubber roller through consultation between the supply and demand parties: a,
Rubber international hardness (IRHD);
Shore hardness (Shore A or Shore D);
PJ hardness (PJ).
Since hardness is affected by temperature, the measurement temperature should be specified when necessary. Note:
There is a certain relationship between IRHD, Shore hardness, and PJ measurement values. IRHD and Shore A hardness values are basically equal. For measurements with general accuracy requirements, Shore A hardness tester can be used instead of rubber international hardness tester, but it should be noted that the measurement results are different due to different reading times; 2 For all manually operated hardness testers, the readings are affected by the operator. When using rubber international hardness tester or Zhao's hardness tester, the readings are affected by the loading speed and whether the applied force is vertical. When using spring-type Shore hardness tester, the readings are more related to the pressure size; Since hardness is measured by indentation, the thickness of rubber and plastic has an impact on the hardness value. Under standard laboratory conditions, when the coating thickness meets the following 3
regulations, the measured coating material hardness is the rubber roller hardness. aIRHD
0～50IRHD: thickness ≥9mm; >50IRHD: thickness ≥6mm. b Shore hardness
0~50 Shore A: thickness ≥9mm;>50 Shore A, Shore D: thickness ≥6mm. cP.J
>200P.J: thickness ≥18mm;100~200P.J: thickness ≥12mm;40~100P.J: thickness ≥9mm;0~40P.J: thickness ≥6mm. 4 Hardness measurement
4.1 Method
Approved by the State Administration of Petroleum and Chemical Industry on April 20, 1999, 360
Implementation on April 1, 2000
HG/T3077—1999
4.1.1IRHD hardness: According to the method specified in HG/T2450, use the rubber international hardness tester to measure. The hardness tester equipment should be suitable for the support for measuring the hardness of curved surfaces. It should also be equipped with a clamp to clamp the rubber roller with a diameter greater than 16mm and less than 100mm. The Zhao hardness tester support and other supports that can measure curved surfaces can also be used.
4.1.2 Shore hardness: According to the method specified in HG/T2413.2, if the hardness is less than 90 Shore A, use the Shore A hardness tester to measure. If the hardness is greater than 90 Shore A, use the Shore D hardness tester to measure. 4.1.3 P.J hardness: measured according to the method specified in HG/T2413.1, using Zhao's hardness tester with a steel ball diameter of 3.175mm. 4.2 Test conditions
4.2.1 Test temperature: the test should be carried out at the standard test room temperature, which is specified in GB2941 as (23±2)℃. In order to ensure temperature balance, the rubber roller should be placed at the test temperature before the test. Because hardness is affected by temperature, in order to make the measurement results comparable, the same temperature should be used throughout the entire process of each or each group of tests. If the conditions are not met, the effect of temperature on the hardness of the coating material should be considered in order to correctly compare the test results. The temperature should be recorded during the test.
4.2.2 Coating surface: In the absence of special requirements, the test should be carried out on a polished, smooth and clean surface. 4.3 Test steps
4.3.1 For rubber rollers with a rubber coating length of less than 2.5m, the hardness should be measured at five points: one point at every 120° on the middle circumference of the rubber roller, for a total of three points; one point at each position 10% of the coating length from the two ends of the rubber roller, for a total of two points. 4.3.2 For rubber rollers with a rubber coating length of more than 2.5m, the hardness should be measured at nine points: one point at every 120° on the middle circumference of the rubber roller, for a total of three points; one point at every 120° on the circumference 10% of the coating length from the two ends of the rubber roller, for a total of six points. 4.4 Result expression
Measure the hardness of the rubber roller according to the provisions of 4.3, take the average value, and record the measurement results as integers. 5 Nominal hardness
The hardness range of rubber roller is very wide. The specific hardness shall be selected by both the supplier and the buyer according to the requirements of Chapter 3 from the following integers: IRHD hardness: 99, 98, 97, 95IRHD. When it is less than 95IRHD, multiples of 5 (such as 90, 85, 80IRHD) should be selected. a.
b. Shore hardness: multiples of 5 (such as 40, 45, 50, 55 Shore hardness values) should be selected. c. PJ hardness: 0~15P.J, multiples of 3; 15~100P.J, multiples of 5; 100~200P.J, multiples of 10; >200P.J, which is a multiple of 25.
6 Permissible deviation of nominal hardness
Unless otherwise specified (see Chapter 8), the permissible deviation of the measured hardness value from the nominal hardness shall comply with the following provisions: a. IRHD hardness: see Table 1.
Nominal IRHD hardness
Shore hardness: ±5 Shore A or Shore D hardness. b.
PJ hardness: see Table 2.
Allowable deviation
Nominal PJ
HG/T3077-1999
≤250
When the nominal hardness of the rubber roller exceeds 250P.J hardness, the supplier and the buyer shall negotiate and decide. The hardness difference of the same root
Allowable deviation
Measured according to the point selection method specified in 4.3, the difference between the highest and lowest values of the measurement results is the hardness difference of the same root; unless otherwise specified (see Chapter 8), the maximum allowable hardness difference of the same root rubber roller shall comply with the following provisions: a.
IRHD hardness: see Table 3.
Nominal IRHD
Shore hardness: 4Shore A or Shore D.
PJ hardness: see Table 4.
Conformity of technical requirements
≤150
The allowable deviation of nominal hardness (see Chapter 6) and the hardness difference with the same root (see Chapter 7) shall be considered separately; the maximum allowable hardness difference
The maximum allowable hardness difference
If the allowable deviation of nominal hardness or the tolerance of hardness with the same root required by the purchaser is less than the provisions in Chapter 6 and Chapter 7, the purchaser's requirements cannot be met due to the limitations of raw materials, production process, metal core structure and test instrument accuracy (see Note ② in Chapter 3).
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