1、BRITISH STANDARD BS7442-2: 1991 ISO/TR 7621:1982 Rubber or plastics covered rollers Part2: Recommendations for technical information to be provided by the purchaserBS7442-2:1991 This British Standard, having been prepared under the directionof the Plastics and Rubber Standards Policy Committee, was
2、published underthe authority of the Standards Board and comes intoeffect on 30 September1991 BSI09-1999 The following BSI references relate to the work on this standard: Committee reference PRM/73 Draft for approval91/42150 ISBN0 580 20055 8 Committees responsible for this British Standard The prepa
3、ration of this British Standard was entrusted by the Plastics and Rubber Standards Policy Committee (PRM/-) to Technical Committee PRM/73, upon which the following bodies were represented: British Rubber Manufacturers Association Ltd. British Structural Bearings Manufacturers Association Building Em
4、ployers Confederation Department of the Environment (Building Research Establishment) Department of Transport Institute of Medical Laboratory Sciences Institution of Structural Engineers Malaysian Rubber Producers Research Association Ministry of Defence Royal Society of Chemistry Amendments issued
5、since publication Amd. No. Date CommentsBS7442-2:1991 BSI 09-1999 i Contents Page Committees responsible Inside front cover National foreword ii 0 Introduction 1 1 Scope and field of application 1 2 References 1 3 Roller application 1 4 Roller design and construction 1 5 Service characteristics 2 6
6、Other specific requirements and other relevant information 3 Figure Covering of roll face, ends and journals 4 Publication(s) referred to Inside back coverBS7442-2:1991 ii BSI 09-1999 National foreword This Part of BS7442 has been prepared under the direction of the Plastics and Rubber Standards Pol
7、icy Committee. It is identical with ISO/TR7621 “Rubber or plastics covered rollers Enquiries and orders Recommendations for technical information to be supplied by purchaser”, published by the International Organization for Standardization (ISO). As roller coverings are required to serve an extremel
8、y wide variety of end-uses in a number of different industries, from manufacturing textiles to food processing, it is most important that the roller covering manufacturer and the roller coverer have all the information necessary to formulate the most appropriate polymer and roller covering finish. T
9、his Part of BS7442 is intended to assist in achieving this. Cross-references The Technical Committee has reviewed the provisions of ISO6123-1, ISO6123-2 and ISO6123-3 to which reference is made in the text and decided that they are acceptable for use in conjunction with this standard. NOTEIt is inte
10、nded to publish specifications for rubber or plastics covered rollers as Part4 of this standard (seeBS7442-0). A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a Britis
11、h Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi and ii, pages1 to4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incor
12、porated. This will be indicated in the amendment table on the inside front cover.BS7442-2:1991 BSI 09-1999 1 0 Introduction This Technical Report specifies the essential information required by the roller covering manufacturer. Covered rollers are cylindrical cores, usually made of metal upon which
13、a covering of rubber or plastics is bonded. The covering specification is made for a particular application. The rollers are made in a wide variety of sizes and the covering will vary in hardness, type of material and surface treatment depending upon their intended use. The function of the roller to
14、gether with the conditions under which it has to operate, determine its size and structure as well as the physical and chemical properties of the covering material. This document lists most of the essential information required to establish the most serviceable and durable roller covering. It should
15、 serve as a basis for questionnaires to be completed by a roller customer in connection with an enquiry or order. Not all questions are pertinent to every roller application. Only questions relevant to the application need be answered. Different industries would ideally require individual compilatio
16、ns. Roller manufacturers have or may elaborate from the items below different lists of queries for different industries or types of machinery. NOTEIf different terms are applied in English and American usage, both terms are given, in the format Englishterm/American term. 1 Scope and field of applica
17、tion This Technical Report specifies most of the information which may be required by a manufacturer from a customer in order to determine the most suitable roller covering for a particular purpose. 2 References ISO6123-1 toISO 6123-3, Rubber or plastics covered rollers Specifications Part1:Requirem
18、ents for hardness Part2:Surface characteristics 1) Part3:Dimensions and dimensional tolerances 1) . 3 Roller application 3.1 Machine in which the roller is used: a) branch or type of industry; b) function of the machine or process; c) machine manufacturer: 1) type, 2) year of construction; d) roller
19、 position on machine. 3.2 Function of the roller: for example suction, squeezing, guiding, carrying, driving, spreading, drawing, inking, engraving, embossing. 3.3 Products carried: a) nature of product carried by or in contact with the roller, for example fabric, paper, sheet metal, timber, etc; b)
20、 thickness of product (if applicable); c) temperature of product. 4 Roller design and construction 4.1 Roller core/shell 4.1.1 Design: a) material, for example steel tube, cast iron, stainless steel, bronze shell, brass, aluminium; b) solid or hollow; c) mounted journals/shafts or open ended; d) man
21、ner in which ends/heads and journals/hubs are fastened to core/shell, for example welded, screwed, or shrink fitted. 4.1.2 Dimensions (seetheFigure): a) length of the core/shell (face length); b) outside diameter of core/shell; c) inside diameter of core/shell or wall thickness of core/shell; d) tot
22、al length over journals/shafts (overall length) or length of journals/shafts; e) diameter of journals/shafts. 4.1.3 Mass of core/shell: with or without ends/heads and journals/shafts? 4.1.4 Surface of core/shell: for example as cast, smooth, roughened, grooved, drilled. 4.1.5 Balancing a) Balancing
23、prior to covering, yes or no? either static or dynamic. b) Balancing after covering, yes or no? either static or dynamic. 4.1.6 Other relevant details of the roller core/shell: for example device for water cooling (shower), device for heating. 1) At present at the stage of draft.BS7442-2:1991 2 BSI
24、09-1999 4.2 Previous roller covering 4.2.1 With what has the roller been covered so far? Specify a) material; b) hardness; c) colour; d) previous order number and quality supplied if this or another roller has been covered before for the same application. Is it possible to transmit a sample of the p
25、revious covering? 4.2.2 Did the previous covering give satisfaction? If not, why not? 4.3 Dimensions of covering 4.3.1 Length of covering (face length) 4.3.2 Outside diameter of covering (finished diameter) or thickness of covering Cross-section of roller parallel or crowned: a) form or shape of cro
26、wn (if applicable); b) crown dimensions (if applicable). 4.3.3 Requirements on tolerances (seeISO6123-3): a) tolerance on diameter; b) tolerance on parallelism or crown; c) tolerance on concentricity; d) tolerance on length. 4.3.4 Finish at ends of face covering (seetheFigure): Edges a) square or ro
27、unded (radiused); b) chamfered; c) tapered; d) dubbed (relieved). Specify dimensions. End/head and journal/hub covering (see4.5). 4.3.5 Surface (see4.4.4) If surface is drilled: a) drilled length; b) pattern of holes; c) shape of holes: 1) diameter, tapered, chamfered, 2) depth (in case of blind dri
28、lled). 4.3.6 Other relevant details of the covering dimensions 4.4 Material, hardness and surface of covering 4.4.1 Material requested a) rubber; b) plastics. 4.4.2 Hardness requested (seeISO6123-1): a) in international rubber hardness degrees (IRHD); b) in Shore A hardness degrees; c) in Shore D ha
29、rdness degrees; d) in Pusey and Jones indentation values. 4.4.3 Colour requested 4.4.4 Surface requested (seeISO6123-2): a) surface quality grade; b) surface finish/treatment class; c) special treatment or structure, for example drilled, grooved, herringbone pattern, etc. 4.5 Covering of ends/heads,
30、 journals/hubs and flingers (seetheFigure) If a covering of ends/heads and journals/hubs is requested, a drawing should be supplied. a) covering of ends/heads thickness; b) covering of journals/hubs: 1) length of covering including covered journals/hubs or length of journal/hub covering, 2) diameter
31、 of journal/hub covering or thickness of journal/hub covering; c) splash rings, flange pulleys or flingers? 5 Service characteristics 5.1 Working period Express the working period in hours per week. 5.2 Speed: a) surface speed, expressed in metres per minute, or revolutions per minute constant or va
32、rying? (in case of variations, specify average speed and duration of maximum speed); b) roller driven or idling.BS7442-2:1991 BSI 09-1999 3 5.3 Loading: a) total loading, in newtons, or nip load, expressed in newtons per millimetre constant or varying? (in case of variations, specify average pressur
33、e and duration of maximum pressure); b) loading measurable? c) pressure mechanism, for example pneumatic, hydraulic, dead weight loaded, hand operated; d) release during standstill/shut down? 5.4 Contacting roller: a) material of roller in contact: 1) soft or hard rubber, ebonite, plastics, 2) metal
34、 (specify), 3) ceramics; b) surface condition (smooth, rough, grooved?); c) hardness of a rubber or plastics roller in contact; d) even speed or friction? e) synchronized drive or surface friction drive? 5.5 Temperature: a) roller temperature constant or varying? (in case of variations, specify aver
35、age temperature and duration of maximum temperature); b) influences of coldness down to. . . C; c) internal heating or cooling. 5.6 Chemical environment Is the roller running a) totally immersed in a bath? b) moistened by web or carryover? c) only splashed by chemicals? Chemical resistance required
36、against a) acids; b) alkalis; c) salts; d) oils or greases; e) organic solvents; f) other. NOTECharacterize the chemicals used not only in general terms, for example “acid” or “solvent”, but as specifically as possible. A sample should be delivered whenever possible. Give concentration or pH value l
37、imits for agents against which chemical resistance is required. Is colour fastness required? If so, against which chemical? Is the roller operating near equipment capable of generating ozone? 5.7 Cleaning and washing: a) method of roller cleaning; b) products or washing agents used for roller cleani
38、ng; c) frequency of cleaning; d) duration of cleaning procedure. 6 Other specific requirements and other relevant informationBS7442-2:1991 4 BSI 09-1999 Figure Covering of roll face, ends and journalsBS7442-2:1991 BSI 09-1999 Publication(s) referred to Seenational foreword.BS7442-2: 1991 ISO/TR 7621
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