EN ISO 294-4:2003
(Main)Plastics - Injection moulding of test specimens of thermoplastic materials - Part 4: Determination of moulding shrinkage (ISO 294-4:2001)
Plastics - Injection moulding of test specimens of thermoplastic materials - Part 4: Determination of moulding shrinkage (ISO 294-4:2001)
Kunststoffe - Spritzgießen von Probekörpern aus Thermoplasten - Teil 4: Bestimmung der Verarbeitungsschwindung (ISO 294-4:2001)
Dieser Teil von ISO 294 legt ein Verfahren fest für die Bestimmung der Verarbeitungsschwindung und der Nachschwindung spritzgegossener Probekörper aus Thermoplasten, parallel und senkrecht zur Schmelze-Fließrichtung.
Hinsichtlich der Bestimmung der Schwindung von Duroplasten siehe ISO 2577 [2].
Die Verarbeitungsschwindung, wie sie in diesem Teil von ISO 294 definiert ist, schließt Auswirkungen von Feuchteaufnahme aus. Das ist in der Nachschwindung und somit in der Gesamtschwindung enthalten. Hinsichtlich der Fälle, in denen die Nachschwindung ausschließlich durch Feuchteaufnahme verursacht wird, siehe ISO 175 [1].
Die Verarbeitungsschwindung, wie sie in diesem Teil von ISO 294 definiert ist, stellt die so genannte freie Schwindung mit uneingeschränkter Verformung der abkühlenden Formteile im Formwerkzeug während der Nachdruckzeit dar. Sie kann demzufolge als der Höchstwert einer beschränkten Schwindung angesehen werden.
Plastiques - Moulage par injection des éprouvettes de matériaux thermoplastiques - Partie 4: Détermination du retrait au moulage (ISO 294-4:2001)
Polimerni materiali – Preskušanci iz plastomerov, oblikovani z injekcijskim vbrizgavanjem – 4. del: Določitev skrčka pri oblikovanju (ISO 294-4:2001)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-julij-2003
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SIST EN ISO 294-4:1999
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Plastics - Injection moulding of test specimens of thermoplastic materials - Part 4:
Determination of moulding shrinkage (ISO 294-4:2001)
Kunststoffe - Spritzgießen von Probekörpern aus Thermoplasten - Teil 4: Bestimmung
der Verarbeitungsschwindung (ISO 294-4:2001)
Plastiques - Moulage par injection des éprouvettes de matériaux thermoplastiques -
Partie 4: Détermination du retrait au moulage (ISO 294-4:2001)
Ta slovenski standard je istoveten z: EN ISO 294-4:2003
ICS:
83.080.20 Plastomeri Thermoplastic materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN ISO 294-4
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2003
ICS 83.080.20 Supersedes EN ISO 294-4:1998
English version
Plastics - Injection moulding of test specimens of thermoplastic
materials - Part 4: Determination of moulding shrinkage (ISO
294-4:2001)
Plastiques - Moulage par injection des éprouvettes de Kunststoffe - Spritzgießen von Probekörpern aus
matériaux thermoplastiques - Partie 4: Détermination du Thermoplasten - Teil 4: Bestimmung der
retrait au moulage (ISO 294-4:2001) Verarbeitungsschwindung (ISO 294-4:2001)
This European Standard was approved by CEN on 27 December 2002.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2003 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 294-4:2003 E
worldwide for CEN national Members.
CORRECTED 2003-03-19
Foreword
The text of ISO 294-4:2001 has been prepared by Technical Committee ISO/TC 61 "Plastics" of
the International Organization for Standardization (ISO) and has been taken over as EN ISO
294-4:2003 by Technical Committee CEN/TC 249 "Plastics", the secretariat of which is held by
IBN.
This European Standard shall be given the status of a national standard, either by publication of
an identical text or by endorsement, at the latest by August 2003, and conflicting national
standards shall be withdrawn at the latest by August 2003.
This document supersedes EN ISO 294-4:1998.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium, Czech
Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and
the United Kingdom.
Endorsement notice
The text of ISO 294-4:2001 has been approved by CEN as EN ISO 294-4:2003 without any
modifications.
NOTE Normative references to International Standards are listed in Annex ZA (normative).
Annex ZA
(normative)
Normative references to international publications
with their relevant European publications
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of
any of these publications apply to this European Standard only when incorporated in it by
amendment or revision. For undated references the latest edition of the publication referred to
applies (including amendments).
NOTE Where an International Publication has been modified by common modifications, indicated
by (mod.), the relevant EN/HD applies.
Publication Year Title EN Year
ISO 294-1 1996 Plastics - Injection moulding of test EN ISO 294-1 1998
specimens of thermoplastic materials -
Part 1: General principles, and moulding
of multipurpose and bar test specimens
ISO 294-3 1996 Plastics - Injection moulding of test EN ISO 294-3 1998
specimens of thermoplastic materials -
Part 3: Small plates
INTERNATIONAL ISO
STANDARD 294-4
Second edition
2001-12-15
Plastics — Injection moulding of test
specimens of thermoplastic materials —
Part 4:
Determination of moulding shrinkage
Plastiques — Moulage par injection des éprouvettes de matériaux
thermoplastiques —
Partie 4: Détermination du retrait au moulage
Reference number
ISO 294-4:2001(E)
©
ISO 2001
ISO 294-4:2001(E)
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©
ii ISO 2001 – All rights reserved
ISO 294-4:2001(E)
Contents Page
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Apparatus . 3
5 Procedure . 3
6 Expression of results . 6
7 Precision . 7
8 Test report . 7
Annex
A Reference points for length and width measurement. 8
Bibliography. 9
©
ISO 2001 – All rights reserved iii
ISO 294-4:2001(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO
member bodies). The work of preparing International Standards is normally carried out through ISO technical
committees. Each member body interested in a subject for which a technical committee has been established has
the right to be represented on that committee. International organizations, governmental and non-governmental, in
liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical
Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this part of ISO 294 may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
International Standard ISO 294-4 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 9,
Thermoplastic materials.
This second edition cancels and replaces the first edition (ISO 294-4:1997), which has been technically revised.
ISO 294 consists of the following parts, under the general title Plastics — Injection moulding of test specimens of
thermoplastic materials:
— Part 1: General principles, and moulding of multipurpose and bar test specimens
— Part 2: Small tensile bars
— Part 3: Small plates
— Part 4: Determination of moulding shrinkage
— Part 5: Preparation of standard specimens for investigating anisotropy
Annex A of this part of ISO 294 is for information only.
©
iv ISO 2001 – All rights reserved
ISO 294-4:2001(E)
Introduction
See ISO 294-1.
In the injection moulding of thermoplastics, the difference between the dimensions of the mould cavity and those of
the moulded articles produced from it may vary with the design and operation of the mould. Such differences may
depend on the size of the injection-moulding machine, the shape and dimensions of mouldings including any
restrictive action this may have on the shrinkage, the degree and direction of flow or movement of the material in the
mould, the sizes of the nozzle, sprue, runner and gate, the cycle on which the machine is operated, the temperature
of the melt and the mould, and the magnitude and duration of the hold pressure. Moulding and post-moulding
shrinkage are caused by crystallization, volume relaxation and orientation relaxation of the material and by thermal
contraction of both the thermoplastic material and the mould. Post-moulding shrinkage may also be influenced by
humidity uptake.
The measurement of moulding and post-moulding shrinkage is useful in making comparisons between
thermoplastics and in checking uniformity of manufacture.
The method is not intended as a source of data for design calculations of components. Information on the typical
behaviour of a material can be obtained, however, by carrying out measurements at different melt and mould
temperatures, injection velocities and hold pressures, as well as at different values of other injection-moulding
parameters. The information thus obtained is important in establishing the suitability of the moulding material for the
production of moulded articles with accurate dimensions.
©
ISO 2001 – All rights reserved v
INTERNATIONAL STANDARD ISO 294-4:2001(E)
Plastics — Injection moulding of test specimens of thermoplastic
materials —
Part 4:
Determination of moulding shrinkage
1 Scope
This part of ISO 294 specifies a method of determining the moulding shrinkage and post-moulding shrinkage of
injection-moulded test specimens of thermoplastic material in the directions parallel to and normal to the direction of
melt flow.
[2]
For the determination of shrinkage of thermosets see ISO 2577 .
Moulding shrinkage as defined in this part of ISO 294 excludes the effects of humidity uptake. This is included in
post-moulding shrinkage and thus in total shrinkage. For cases when post-moulding shrinkage is caused by the
[1]
uptake of humidity only, see ISO 175 .
Moulding shrinkage as defined in this part of ISO 294 represents the so-called free shrinkage with unrestricted
deformation of the cooling plates in the mould during the hold period. It may be considered therefore as the maximum
value of any restricted shrinkage.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this part of ISO 294. For dated references, subsequent amendments to, or revisions of, any of these publications do
not apply. However, parties to agreements based on this part of ISO 294 are encouraged to investigate the possibility
of applying the most recent editions of the normative documents indicated below. For undated references, the latest
edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid
International Standards.
ISO 294-1:1996, Plastics — Injection moulding of test specimens of thermoplastic materials — Part 1: General
principles, and moulding of multipurpo
...
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