《BS-1755-2-1974.pdf》由会员分享，可在线阅读，更多相关《BS-1755-2-1974.pdf（22页珍藏版）》请在三一文库上搜索。
1、BRITISH STANDARD BS 1755-2: 1974 Incorporating Amendment No. 1 Glossary of Terms used in the plastics industry Part 2: Manufacturing processes UDC 001.4:678.5.002.2 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 03:21:48 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1755-2:1974 This British
2、Standard, having been approved by the Plastics Industry Standards Committee, was published under the authority of the Executive Board on 11 July 1974 BSI 12-1999 First published as BS 1755 July 1951 First revision Part 1 February 1962 Part 2 July 1974 The following BSI references relate to the work
3、on this standard: Committee reference PLC/12 Drafts for comment 69/6206, 70/27567 and 72/52363 ISBN 0 580 08275 X Co-operating organizations The Plastics Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Governmen
4、t departments and scientific and industrial organizations: British Plastics Federation* British Resin Manufacturers Association Building Research Establishment Chemical Industries Association Ltd. Department of Trade and Industry Electrical and Electronic Insulation Association Electrical Installati
5、on Equipment Manufacturers Association Electrical Research Association Engineering Equipment Users Association Ministry of Defence Ministry of Defence, Navy Department Ministry of Defence Procurement Executive Plastics Institute* Post Office Royal Institute of British Architects Royal Institute of P
6、ublic Health and Hygiene Rubber and Plastics Research Association of Great Britain Society of Motor Manufacturers and Traders Ltd. The scientific and industrial organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted
7、with the preparation of this British Standard: Leathercloth and Coated Fabric Manufacturers Association Individual experts Amendments issued since publication Amd. No.Date of issueComments 3935May 1982Indicated by a sideline in the margin Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 03:21:
8、48 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1755-2:1974 BSI 12-1999i Contents Page Co-operating organizationsInside front cover Forewordii 21Compounding1 22 Part 2: Manufacturing processes. Further Parts of the revision are in preparation and will include terms relating to certain manufacturing
9、 processes (e.g. cellular plastics, reinforced plastics) which were not covered in BS 1755:1951. BS 1755-1:1982, which is technically equivalent to ISO 472:1979, supersedes both BS 1755:1951 and BS 1755-1:1967. Terms that are given in BS 1755-1:1982 have been deleted from this Part by Amendment No.
10、1 (AMD 3935). Terms and definitions adopted by Technical Committee 61 Plastics, of the International Organization for Standardization (ISO) have been taken into account as far as possible in the preparation of this glossary. Where terms are used with different meanings in different parts of the plas
11、tics industry, definitions for these are given in appropriate sections of the glossary. Such definitions only apply in their proper context. The branch of the plastics industry to which a particular term applies is included in brackets in the index. NOTEWhere a definition is applicable to more than
12、one term, the preferred term is that printed in bold type. 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 British Standard does not of itself confer immunity from l
13、egal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 16 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside f
14、ront cover. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 03:21:48 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1755-2:1974 BSI 12-19991 21 Compounding No.TermDefinition 2104powder mixingA method of mixing resin, in powder form, and additives to produce a free flowing powder. 2105gelationA
15、 stage in compounding material, at which it first becomes a coherent mass. NOTESee also 2717 for the definition of this term as applied to fabric and paper coating. 2106masterbatchA compounding ingredient comprising resin and additives, with the additives present in higher concentrations than are re
16、quired in the final plastics material. 2107processing aidAn additive to, or a component in, a resin to facilitate processing. 2108phrParts by mass of an additive per 100 parts by mass of resin. 2109internal mixerA mixer consisting of specially shaped rotors operated in a closed chamber. 2110millA ma
17、chine with two roles forming a nip for masticating, mixing, warming or rough sheeting. 22 when the material is to be forced into the mould, the screw is moved axially in the heating cylinder as a plunger. 2234injection plungerThe plunger which operates in the cylinder of an injection moulding machin
18、e to apply the injection pressure. 2235heating cylinderThe chamber of an injection moulding machine wherein materials are softened by heat before being injected into the mould. 2237nozzleA component at the end of the cylinder containing an orifice, through which the heated plastics material passes i
19、nto the sprue channel. 2238shut-off nozzleA nozzle incorporating a valve which is closed when the nozzle is not in contact with the mould. 2239ejectorAn attachment to a press or injection moulding machine, used to operate ejector pins. 2240ejector ramA small hydraulic or pneumatic ram fitted to a pr
20、ess for the purpose of operating the ejector mechanism. 2241balance trayIn automatic moulding, a catchment tray on which the ejected moulding falls, so controlling the operation of the sequence switch. 2245injection pressureThe pressure applied to the moulding material to inject it into the mould. 2
21、246ram pressureUsed colloquially for the total force applied by a hydraulic ram; equal to the hydraulic pressure multiplied by the ram area. 2247flow mouldingA method of using a screw-plunger injection moulding machine in which the screw continues to rotate during the injection period, thus enabling
22、 items of a greater size than the normal shot capacity to be moulded. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 03:21:48 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1755-2:1974 BSI 12-19993 2249mould impression mould form The space in which the moulding material hardens and takes its
23、form. 2250single impression mould single cavity mould A mould which produces one moulding per moulding cycle. 2251multi-impression mould multi-cavity mould A mould which produces more than one moulding per moulding cycle. 2253portable mould hand mould loose mould A mould designed to be removed from
24、the press for stripping and loading. 2257cored mouldA mould incorporating passages for carrying heating or cooling media. 2258bar mould gang mould A multi-impression mould in which the impressions are arranged in rows on separate bars which may be removed individually from the press. 2260three-plate
25、 toolAn injection moulding tool having an additional daylight, usually to enable removal of a feed system not on the main tool parting line. 2264insulated runner mould An injection mould in which the runner is of sufficient cross-sectional area for the solidified material in contact with the walls t
26、o insulate the material at the centre so that it remains fluid. 2266direct feed sprue gating A method of feed with no gate or runner, the material being injected directly into the mould impression through the sprue. 2267side gateA gate at the die parting line where the width of the gate is no greate
27、r at the cavity than at the runner. 2268fan gateA gate at the die parting line where the width of the gate is greater at the cavity than at the runner. 2269pin gateA gate essentially circular of very small cross-sectional area. 2270tunnel gate submarine gate A gate which enters the moulding cavity a
28、way from the die parting line, but where the runner is on the die parting line. 2271flash gateA gate which feeds material from one mould impression to another. 2272ring gateA gate which extends along the whole periphery of the moulding. 2273bar gateA gate which, with its associated runner, extends a
29、long a substantial part of the periphery of the moulding. 2274diaphragm gateA gate which covers the whole area but not the whole depth of an aperture in a moulding and is subsequently machined out. 2275extended nozzle gateAn injection moulding machine nozzle extended to enter the mould as far as the
30、 mould cavity and acting as a gate. 2276tab gateA gate feeding into a tab which is subsequently removed from the moulding. 2277degatingSeparating a moulding from its feed system. 2278mould forceThe top or bottom part of a compression mould. No.TermDefinition Licensed Copy: sheffieldun sheffieldun, n
31、a, Fri Nov 24 03:21:48 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1755-2:1974 4 BSI 12-1999 2779die plateIn moulds, the main support for the punch or mould cavity. 2282floating punch floating core A punch free to align itself in the female portion of the mould during closing. 2283loose punch loos
32、e core A punch that is ejected with the moulding and subsequently removed from it. 2285mould insertA part of a mould which is made separately and fitted as part of the construction of the punch or mould cavity. 2286cavity registerMatching angled faces on each half of the mould, which when the mould
33、is closed, give alignment of the impression. 2288mould register location spigot A circular disc mounted on the mould base plate which locates in a register hole of the press. 2290ejector plateA plate used to operate ejector pins and designed to apply a uniform force to them in the process of ejectio
34、n 2291spiderA form of ejector plate in which legs operating ejector pins are the predominant feature. NOTESee also 2556 for the definition of this term as applied to extrusion. 2292ejector pinA movable pin fitted in a mould and used in the process of ejection to push the moulding from the mould impr
35、ession. 2293return pin push back A pin in a mould which pushes back the ejector assembly as the mould closes. 2294stripper plateA plate shaped to the mould punch to eject the moulding by pressure over its periphery. 2295sprue bushThat part of an injection or transfer mould containing the sprue chann
36、el and providing the seal with the nozzle. 2297loading chamber loading cavity The additional space in a compression mould, to accommodate the mould charge when the mould cavity is not large enough to do so. 2303core pinA pin located in a mould to produce a plain or threaded hole in a moulding. 2306g
37、uide pinA pin fitted into one part of a mould which enters a corresponding hole in the other part so that when the mould is closed the two parts become accurately aligned. 2309mould shrinkage allowance contraction allowance The difference in linear dimensions, often expressed as a ratio, between a m
38、oulding and the corresponding mould form, both being at normal room temperature when measured. 2314curing timeThat part of the moulding cycle for thermosetting materials during which the mould is closed. No.TermDefinition Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 03:21:48 GMT+00:00 2006
39、, Uncontrolled Copy, (c) BSI BS 1755-2:1974 BSI 12-19995 2317sprayA shot from a multi-impression mould. 2318projected area1) In injection moulding. The total area of the shot or spray projected on to a plane at right angles to the direction of the locking force. 2) In compression moulding. The total
40、 area of the moulding together with any flash projected on to a plane at right angles to the applied force. 2319strippingThe removal of a moulding from a mould. 2320tooling lineA line on the surface of a moulding and formed at the junction of stationary mould parts. 2323finishingThe development of d
41、esired surface characteristics on moulded plastics products, including such operations as deflashing or degating. 24 Calendering and embossing 2401calenderA machine comprising two or more heated rolls used to produce film or sheeting. NOTESee also 2607 for the definition of this term as applied to t
42、he block process. 2402calenderingThe production of film or sheeting by means of a calender. 2404camberThe convexity or concavity of the longitudinal section of a roll. 2405roll bendingThe controlled deformation of a calender bowl by the application of forces normal to its axis. 2406crossed axisAn ar
43、rangement whereby the axis of a bowl in a calender is set at a small angle to the axis of the adjacent bowl(s). 2408friction ratioThe ratio of surface speeds of rolls forming a nip. 2409mattingThe process of rendering a polished surface uniformly dull. 2411embossing rollA roll having a patterned sur
44、face used to produce embossed sheeting. 2412embossing shellA sleeve with a patterned surface, for fitting to a roller to act as an embossing roll. 2413back-up rollA roll, usually with a surface of soft material such as rubber, used together with an embossing roll or other metal roll such as a polish
45、ing roll to form a nip. 2414cooling drumA water cooled roll for cooling sheeting passing over it. 2415cooling trainA set of cooling drums. 2416stripper rollA small roll, usually driven, to assist removal of sheeting from, for example, a calender. 2417spreader rollA form of roll for removing wrinkles
46、 from moving sheeting. 2420dolly pig A hot roll of compound for feeding to a calender. No.TermDefinition Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 03:21:48 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1755-2:1974 6 BSI 12-1999 2421rolling bank bank The accumulated mass of material imme
47、diately prior to passage through a nip. 2423batching strainThe dimensional change at ambient temperature. 2424calender strainThe dimensional change at a particular temperature between ambient and 100 C. 2425high temperature strain The dimensional change at a temperature above 100 C. 25 Extrusion 250
48、2extrudateThe product of an extrusion process. 2504screw extruderA machine consisting essentially of a barrel with means of temperature control and housing one or more rotating Archimedean screws which convey plastics material from a feed aperture and deliver it as a melt under pressure to a die. 25
49、05twin screw extruderAn extruder with a pair of screws working together in a common barrel. 2506ram extruderA machine consisting essentially of a barrel with means of temperature control, in which a plunger operates to force plastics material, as a melt, to a die. 2507two-stage extruderA screw extruder so designed that the pressure of the extrusion material drops substantially, part way along the screw. 2508vented extruderA two-stage screw extruder having an opening, part way along the barrel, for the removal of air and volatile matter from the plastics material. 25