HG/T 2808-1996 Ordinary offset printing blanket HG/T2808-1996 standard download decompression password: www.bzxz.net

HG/T 2808-1996
At present, there is no unified industry standard for offset rubber blanket in China: In order to meet the needs, this industry standard is specially formulated. The flatness of the rubber blanket in the standard is equivalent to the requirements of the German industrial standard DIN166211991 "Concepts, requirements, tests and marks for printing rubber sheets for offset printing"; the warp and weft length deviation and diagonal length deviation and constant load elongation of the single-speed rubber blanket are equivalent to the relevant provisions of the draft international standard ISO/TC 130 N131 "Conditions of use, test methods and instructions for marks of offset rubber blanket". The tests of inter-layer adhesion strength, warp tensile strength and elongation at break of the rubber blanket are all in accordance with the relevant national standards that have been published. The industry standard implements the appendix A and appendix B of this standard as the appendix of the standard. This standard is proposed by the Technical Supervision Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is issued by Xiyang Rubber Industrial Products Research Institute. The drafting unit of this standard is Hubei Changzhong South Rubber Group Co., Ltd. The drafters of this standard are Liu Dinghong, Cui Gaoxun and Liu Yongchun. This standard is published for the first time.
1 Scope
Chemical Industry Standard of the People's Republic of China
Ordinary offset rubber blanket
HG/T 2808-1996
This standard specifies the product structure, specifications, technical requirements, test methods, inspection rules, product packaging and storage and transportation requirements of ordinary offset rubber blanket (hereinafter referred to as rubber blanket).
This standard is suitable for printing speed of 10 000 Ordinary offset rubber blanket for sheet-fed offset printing machines with a speed of less than 1/h. 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 parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T532-1989 Determination of adhesion strength of vulcanized rubber and fabrics (ncJS0) 36: 1985) HG/T2580---1994 Determination of tensile strength and elongation at break of rubber or plastic coated fabrics (crlVTSO1421: 1977) 3 DefinitionsbzxZ.net
This standard adopts the following definitions,
Smoothness
The maximum difference in thickness within a single piece of rubber blanket specification. 4 Structure
The structure of the rubber blanket shown in Figure 1. Fabric is made of a layer of surface adhesive and multiple layers of fabric adhesive. Fabric layer adhesive Figure 4 Rubber cloth structure 5 Specifications Surface adhesive The specifications of rubber cloth are distinguished by the width (weft length) and length (warp length) of the finished product (see Table 1). Table 1 Specifications of rubber cloth Warp length Note: The specifications exceeding the minimum specifications in the table shall be determined by negotiation between the supply and demand parties. Approved by the Ministry of Chemical Industry of the People's Republic of China on June 28, 1996 142 Implementation on January 1, 1997 6 Technical requirements 6.1 Appearance quality The appearance quality requirements of rubber cloth are given in Table 2 HG/T 2808—1996
Table 2 Appearance quality requirements of rubber blanket
Defect name
Surface adhesive impurities
Surface adhesive depression
Surface adhesive abrasion
Surface color tone
Surface adhesive shrinkage Micropores and bubbles
Base fabric depression
Base fabric folding, tearing and delamination
Base fabric pollution
Note: 1. S is the area of ​​rubber blanket:
Small allowance
The maximum size of the defect is not more than 0.8mm
S<,0. 7 mThe number of defects is not large F 1
0. 7 m1.5 m2 (including rolls) The number of defects is not more than 3/m2. The maximum size of the defect is not more than 3 mm, and the depth is less than 0. 04 1mm. S=1 m2 The number of defects is not more than 1
1 m≤S1. 5 m The number of defects is not more than 2 S>1.5m (including rolls) The number of defects is not more than 2/m. Slight wear is allowed, but it must not exceed the flatness gauge. Slight marks are allowed. The maximum size of the defect is not more than 2.0mm. The depth is less than 0.3malS0.7m The number of defects is not more than 1
0. 7 m2
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