HG/T 2445-1993 Electronic typewriter (printer) rubber roller HG/T2445-1993 Standard download decompression password: www.bzxz.net

Chemical Industry Standard of the People's Republic of China
Electronic Typing (Printing) Machine Rubber Roller
Subject Content and Scope of Application
HG/T 2445-93
This standard specifies the product classification, technical requirements, test method inspection rules and marking, packaging, transportation and storage requirements of electronic typing (printing) machine rubber rollers (hereinafter referred to as typing rubber rollers). This standard applies to electronic typing (printing) machines. Typing rubber rollers composed of metal core and rubber coating for office equipment such as word processors
2 Reference Standards
GB1.3 Standardization Work Guidelines Product Standard Abbreviation GB191 Packaging Storage and Transportation Pictorial Marking
GB/T528 Determination of Tensile Properties of Vulcanized Rubber and Thermoplastic Rubber GB1690 Test Method for Liquid Resistance of Vulcanized Rubber GB9894 Rubber Roll Hardness Requirements
GB／T9895 Classification of Surface Characteristics of Rubber Rollers||tt ||GB/T9896 Rubber roll size tolerance
HG/T2413.1 Determination of apparent hardness of rubber roller by Zhao (PJ) hardness tester method HG/T2413.2 Determination of apparent hardness of rubber roller by Shore hardness tester method HG/T2450 Determination of apparent hardness of rubber roller by rubber international hardness tester method 3 Product classification
3.1 Type structure
The rubber roller is composed of a metal core and a rubber coating (as shown in Figure 1) Figure 1 Rubber roll type structure
1—Rubber coating; 2—Metal core
3.2 Specifications
Typesetting rubber rollers can be selected. One of the three hardnesses specified in Table 1 is the hardness of the rubber roller. The specifications and dimensions shall be in accordance with the relevant drawings. Approved by the Ministry of Chemical Industry of the People’s Republic of China on July 8, 1993 and implemented on July 1, 1994
Hardness name
Shore A hardness (A)
Rubber inter-circumferential hardness (IRHD)
P. J.
3.3 Product marking
3.3.1 Marking method
IIG / T 2445—93
Nominal hardness value, degree
The product shall be marked in the following order: product name, specification (hardness, nominal diameter × coating rubber layer length), this standard number: Hardness indication shall include hardness value and hardness name,
3.3.2 Marking example
Typing rubber roller with Shore A hardness of 85, diameter of 35mm and length of 400mm: Typing rubber roller 85A35×400HG/T2445
Typing rubber roller with international hardness of 85, diameter of 35mm and length of 400mm: Typing rubber roller 85IRHD35×4 00HG/T2445 Zhaoshi (PJ) hardness 30, diameter 35mm, length 400πm typing rubber spoke: typing rubber roller 30P.J35×400HG/T24454 technical requirements
rubber roller size tolerance (see Figure 2) should comply with the provisions of Table 2 4.1
Figure 2 rubber roller size tolerance
diameter tolerance
superior product
qualified product
Note: Cylindricity tolerance t,
circular runout tolerance
bundle rubber length tolerance
4. 2Hardness requirements shall comply with the provisions of Table 3: Nominal surface area, degrees
Shore A
Zhao (PJ)
HG/ T 2445 -- 93
Hardness deviation, degrees
Superior quality
The physical and mechanical properties of the adhesive for adhesive tape shall comply with the provisions of Table 44.3
Tensile strength, MPa
Elongation at break, %
Permanent deformation at break, %
Oil resistance weight change rate %
No. 2 jet fuel (room temperature × 24h)
Flaxseed secretion (room temperature × 24 h)
Qualified products
The hardness of the same root is different,
Superior products
Superior products
4.4 The surface processing of the finished rubber roller should meet the polishing and fine grinding requirements specified in GB/T9895. 4.$ Surface quality of rubber roller
Qualified products
Qualified products
-10~-7
The surface of the rubber roller should be clean, bright and uniform in color. The defects such as sand holes, bubbles, impurities caused by raw materials and processing technology are not allowed to exceed the range specified in Table 5.
Defective parts
Surface within 20mr of the roller petal
Middle fur surface
5 Test method
Superior products
Diameter is less than 0.2, and there are no more than 2 defects with a diameter less than 0.! m blood defects, no more than 2
Qualified products bZxz.net
Defects less than 0.3mm in diameter, no more than 2 Defects less than 0.2 m in diameter, no more than 2 5.1
The determination of rubber tensile strength, elongation at break and permanent deformation at break shall be carried out in accordance with the provisions of GB/T528. Type 1 test specimens shall be used.
HG/T2445-93
5.2 The determination of rubber oil resistance shall be carried out in accordance with the provisions of GB/T1690 5.3 The determination of rubber apparent hardness shall be carried out in accordance with the provisions of GB/T 9894, HGT 2413.1.HG/T2413.2 and HG/T2450.
:54 The dimensional tolerance of rubber rollers shall be determined in accordance with the provisions of GB/T 9896. 5.5 The surface quality of rubber rollers shall be measured by visual inspection and corresponding tools: 5.6 The circular runout of rubber rollers shall be measured by measuring instruments or dry gauges. 6 Acceptance rules
6.1 The factory inspection shall be carried out by the technical inspection department of the manufacturer in accordance with this standard, and a product quality certificate shall be issued. 6.1.1 The finished product inspection of rubber rollers is carried out in batches of 1000 pieces, and 10 pieces are selected from each batch for dimensional tolerance, apparent hardness and surface quality inspection. If all the indicators meet the requirements of the grade in 4.2, 4.4 and 4.5, it can be judged as a product of that grade. If one item does not meet the requirements of that grade, double samples shall be taken for inspection. If there are still items that do not meet the requirements of that grade, they shall be downgraded or judged as unqualified products. 6.1.2 The rubber materials used for rubber rollers are tested for physical properties in batches of monthly production, and all indicators shall meet the requirements of the corresponding grade in 4.3. If there is an item that does not meet the corresponding grade, double the sample should be taken from the batch of rubber materials for retest of the item. If the retest result meets the requirements, it is judged as the rubber material of that grade. If the retest result still does not meet the requirements, the batch of rubber materials should be downgraded or judged as unqualified rubber materials. 6.2 Type inspection shall be carried out in accordance with the provisions of GB1.3. 7.1. After the adhesive tape is wrapped with non-corrosive paper, it should be isolated and fixed with a single piece of light vibration isolation material. The shaft head should not bear weight. It should be packed in cartons or other outer packaging according to the requirements of the transportation method specified by the user. The inside of the packaging box should be clean and free of metal chips, oil stains and dust residues. 7.2. The packaging box should be marked with the following: Manufacturer name and trademark; Product mark; Grade: Quantity; Production date; 7.3. The packaging, storage and transportation marks should comply with the requirements of GB191. 7.4. During transportation and storage, avoid direct sunlight, rain and thunder, strong vibration, contact with acids, alkalis, oils and organic solvents, and keep away from heat sources 2Ⅱ-
7.5 The storage temperature of the rubber roller is in the typewriter storage temperature range. 7.6 Under the above conditions, the performance of the rubber roller shall comply with the provisions of this standard within a storage period of no more than 9 months from the date of manufacture (based on the date of qualified inspection of the rubber roller). Additional instructions:
This standard was proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China, and this standard is under the jurisdiction of Beijing Rubber Products Design Institute. This standard was drafted by Beijing Rubber Products Design Institute and Jixian Rubber Roller Factory of Hebei Province. The main drafters of this standard are Wen Jing, Shen Baoqing, Zhang Youli and Sun Hongliang.
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