SIST EN 12012-2:2002
(Main)Rubber and plastics machines - Size reduction machines - Part 2: Safety requirements for strand pelletisers
Rubber and plastics machines - Size reduction machines - Part 2: Safety requirements for strand pelletisers
This standard specifies the essential safety requirements applicable to the design and construction of strand pelletisers used for plastics and rubber.
The machine begins with the feed opening of the feeding device, or start-up devices if fitted, and ends with the discharge area.
Only the significant hazards listed in clause 4 and dealt with in clause 5 are subject to this standard.
NOTE: Directive 94/9/EC concerning equipment and protective systems intended for use in potentially explosive atmospheres can be applicable to the type of machine or equipment covered by this European Standard. The present standard is not intended to provide means of complying with the essential health and safety requirements of Directive 94/9/EC.
This standard applies to machines which are manufactured after the date of approval of this standard by CEN.
Gummi- und Kunststoffmaschinen - Zerkleinerungsmaschinen - Teil 2: Sicherheitsanforderungen an Stranggranulatoren
Diese Europäische Norm ist eine Typ C-Norm wie in EN 1070 angegeben.
Auf die betreffenden Maschinen und die behandelten Gefährdungen, Gefährdungssituationen und Gefährdungsereignisse wird im Anwendungsbereich dieses Dokumentes hingewiesen.
Für Maschinen, die nach den Festlegungen dieser Typ C-Norm konzipiert und gebaut worden sind, gilt: Wenn die Festlegungen in dieser Typ C-Norm von den Festlegungen in Typ A- oder B-Normen abweichen, haben die Festlegungen dieser Typ C-Norm Vorrang gegenüber den Festlegungen der anderen Normen.
Machines pour le caoutchouc et les matieres plastiques - Machines a fragmenter - Partie 2: Prescriptions de sécurité relatives aux granulateurs a joncs
Cette norme spécifie les exigences essentielles de sécurité relatives a la conception et a la construction des granulateurs a joncs utilisés pour le caoutchouc et les matieres plastiques. La machine commence au bord extérieur du dispositif d'alimentation ou au dispositif de démarrage s'il existe et se termine a la zone de déchargement. Les phénomenes dangereux significatifs sont énumérés a l'article 4, les prescriptions et/ou mesures de sécurité spécifiques des granulateurs a joncs sont énumérées a l'article 5. Cette norme s'applique a avant tout aux machines fabriquées apres sa date de publication.
Rubber and plastics machines - Size reduction machines - Part 2: Safety requirements for strand pelletisers
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 12012-2:2002
01-januar-2002
Rubber and plastics machines - Size reduction machines - Part 2: Safety
requirements for strand pelletisers
Rubber and plastics machines - Size reduction machines - Part 2: Safety requirements
for strand pelletisers
Gummi- und Kunststoffmaschinen - Zerkleinerungsmaschinen - Teil 2:
Sicherheitsanforderungen an Stranggranulatoren
Machines pour le caoutchouc et les matieres plastiques - Machines a fragmenter - Partie
2: Prescriptions de sécurité relatives aux granulateurs a joncs
Ta slovenski standard je istoveten z: EN 12012-2:2001
ICS:
83.200 Oprema za gumarsko Equipment for the rubber and
industrijo in industrijo plastics industries
polimernih materialov
SIST EN 12012-2:2002 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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EUROPEAN STANDARD
EN 12012-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2001
ICS 83.200
English version
Rubber and plastics machines - Size reduction machines - Part
2: Safety requirements for strand pelletisers
Machines pour le caoutchouc et les matières plastiques - Gummi- und Kunststoffmaschinen -
Machines à fragmenter - Partie 2: Prescriptions de sécurité Zerkleinerungsmaschinen - Teil 2:
relatives aux granulateurs à joncs Sicherheitsanforderungen an Stranggranulatoren
This European Standard was approved by CEN on 10 May 2001.
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,
Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, 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
© 2001 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12012-2:2001 E
worldwide for CEN national Members.
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EN 12012-2:2001 (E)
CONTENTS
page
Foreword 3
Introduction 3
1 Scope 3
2 Normative references 4
3 Terms and definitions 6
4 List of significant hazards 9
5 Safety requirements and/or protective measures 10
6 Verification of conformity with the safety requirements and/or protective measures 14
7 Information for use 15
ANNEX A (normative) MEASUREMENT AND DECLARATION OF NOISE EMISSION VALUES 17
ANNEX ZA (informative) Clauses of this European Standard addressing essential requirements or
other provisions of EU Directives 21
2
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EN 12012-2:2001 (E)
Foreword
This European Standard has been prepared by Technical Committee CEN/TC 145 "Rubber and
plastics machines - Safety", the secretariat of which is held by UNI.
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 January 2002, and conflicting national standards
shall be withdrawn at the latest by January 2002.
This European Standard has been prepared under a mandate given to CEN by the European
Commission and the European Free Trade Association, and supports essential requirements of EU
Directive(s).
For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this
standard.
This is the second in a series of standards on the safety of size reduction machines.
Part 1 deals with blade granulators.
Part 3 deals with shredders.
Annex A is normative.
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, Iceland, Ireland, Italy, Luxembourg,
Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.
Introduction
This document is a type C standard as stated in EN 1070.
The machinery concerned and the extent to which hazards, hazardous situations and events are
covered are indicated in the scope of this document.
When provisions of this type C standard are different from those which are stated in type A or B
standards, the provisions of this type C standard take precedence over the provisions of the other
standards, for machines that have been designed and built according to the provisions of this type C
standard.
1 Scope
This standard specifies the essential safety requirements applicable to the design and construction of
strand pelletisers used for plastics and rubber.
The machine begins with the feed opening of the feeding device, or start-up devices if fitted, and ends
with the discharge area.
Only the significant hazards listed in clause 4 and dealt with in clause 5 are subject to this standard.
3
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EN 12012-2:2001 (E)
NOTE: Directive 94/9/EC concerning equipment and protective systems intended for use in potentially
explosive atmospheres can be applicable to the type of machine or equipment covered by this
European Standard. The present standard is not intended to provide means of complying with the
essential health and safety requirements of Directive 94/9/EC.
This standard applies to machines which are manufactured after the date of approval of this standard
by CEN.
2 Normative references
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).
EN 292-1:1991 Safety of Machinery - Basic concepts, general principles for design
Part 1: Basic terminology, methodology
EN 292-2:1991 Safety of Machinery - Basic concepts, general principles for design
+A1/1995 Part 2: Technical principles and specifications
EN 294:1992 Safety of Machinery - Safety distances to prevent danger zones being reached
by the upper limbs
EN 418:1992 Safety of Machinery - Emergency stop equipment, functional aspects -
Principles for design
EN 563:1994 Safety of Machinery - Temperatures of touchable surfaces - Ergonomics data to
establish temperature limit values for hot surfaces
EN 953:1997 Safety of Machinery – Guards - General requirements for the design and
construction of fixed and movable guards
EN 954-1:1996 Safety of Machinery - Safety related parts of control systems - Part 1: General
principles for design
EN 1037:1995 Safety of machinery - Prevention of unexpected start-up
EN 1070 Safety of machinery - Terminology
EN 1088:1995 Safety of Machinery - Interlocking devices associated with guards - Principles
for design and selection
EN 50014 Electrical apparatus for potentially explosive atmospheres - General
requirements
EN 50015 Electrical apparatus for potentially explosive atmospheres -
Oil-immersion "o"
EN 50016 Electrical apparatus for potentially explosive atmospheres -
Pressurised apparatus "p"
4
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EN 12012-2:2001 (E)
EN 50017 Electrical apparatus for potentially explosive atmospheres -
Powder filling "q"
EN 50018 Electrical apparatus for potentially explosive atmospheres -
Flameproof enclosures "d"
EN 50019: Electrical apparatus for potentially explosive atmospheres -
Increased safety "e"
EN 50020 Electrical apparatus for potentially explosive atmospheres -
Intrinsic safety "i"
EN 60204-1:1997 Safety of Machinery - Electrical equipment of machines -
Part 1: General requirements (IEC 60204-1:1997)
EN 60529:1991 Degrees of protection provided by enclosures (IP Code) (IEC 60529:1989)
EN ISO 3741:1999 Acoustics -Determination of sound power levels of noise sources using sound
pressure - Precision methods for reverberation rooms (ISO 3741:1999)
EN ISO 3743-1:1995Acoustics - Determination of sound power levels of noise sources -
Engineering methods for small, movable sources in reverberant fields -
Part 1: Comparison method for hard-walled test rooms (ISO 3743-1:1994)
EN ISO 3743-2:1996Acoustics - Determination of sound power levels of noise sources
using sound pressure - Engineering methods for small, movable
sources in reverberant fields - Part 2: Methods for special
reverberation test rooms (ISO 3743-2:1994)
EN ISO 3744:1995 Acoustics - Determination of sound power levels of noise sources
using sound pressure - Engineering method in an essentially free field over a
reflecting plane (ISO 3744:1994)
EN ISO 3746:1995 Acoustics - Determination of sound power levels of noise sources
using sound pressure - Survey method using an enveloping
measurement surface over a reflecting plane (ISO 3746:1995)
EN ISO 3747:2000 Acoustics - Determination of sound power levels of noise sources using sound
pressure – comparison method for use in-situ (ISO 3747:2000)
EN ISO 4871:1996 Acoustics - Declaration and verification of noise emission values of
machinery and equipment (ISO 4871:1996)
EN ISO 9614-1:1995 Acoustics - Determination of sound power levels of noise sources
using sound intensity - Part 1: Measurement at discrete points
(ISO 9614-1:1993)
EN ISO 9614-2:1996 Acoustics - Determination of sound power levels of noise sources using sound
intensity - Part 2: Measurement by scanning (ISO 9614-2:1996)
5
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EN 12012-2:2001 (E)
EN ISO 11201:1995Acoustics - Noise emitted by machinery and equipment -
Measurement of emission sound pressure levels at the work station and at other
specified positions - Engineering method in an essentially free field over a
reflecting plane (ISO 11201:1995)
EN ISO 11202:1995Acoustics - Noise emitted by machinery and equipment -
Measurement of emission sound pressure levels at the work station and at
other specified positions - Survey method in situ (ISO 11202:1995)
EN ISO 11203:1995Acoustics - Noise emitted by machinery and equipment -
Determination of emission sound pressure levels at the work station
and at other specified positions from the sound power level (ISO 11203:1995)
EN ISO 11204:1995Acoustics - Noise emitted by machinery and equipment -
Measurement of emission sound pressure levels at the work station and at other
specified positions - Method requiring environmental corrections
(ISO 11204:1995)
EN ISO 11688-1:1998 Acoustics - Recommended practice for the design of low-noise
machinery and equipment - Part 1: Planning (ISO/TR 11688-1:1995)
ISO 3745:1977 Acoustics - Determination of sound power levels of noise sources -
Precision methods for anechoic and semi-anechoic rooms
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 1070 and the following terms
and definitions apply:
3.1 Strand pelletiser
A machine which cuts extruded strands into regular pellets within a cutting chamber. Pellet size
regulation is achieved by synchronising the rotating speed of cutting rotor and feeding rolls.
3.2 Cutting chamber
The part of the machine where the cutting/reduction of the material takes place.
3.3 Rotor
A rotating cutting device with regularly spaced blades around the periphery.
3.4 Stationary cutting blade
A blade fixed inside the cutting chamber.
3.5 Start-up device
A device, peculiar to some installations, positioned upstream of the feeding area, which guides the
material strands from the start-up position to the operating position.
3.6 Feeding device
The part of the machine used for feeding the material into the feeding area. The feeding device can
be movable, e.g. conveyor belt or roller(s) or fixed, e. g. chute or plate.
3.7 Feeding area
the area of the machine where the feeding rolls are installed.
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EN 12012-2:2001 (E)
3.8 Discharge area
the area where the pellets leave the cutting chamber.
3.9 Cooling system
A system using water or air, which reduces the temperature of material to the appropriate level for the
cutting process.
3.10 Working level
The surface on which the person who feeds the machine stands.
Key
1 Cutting chamber 6 Feeding rolls
2 Rotor 7 Feeding area
3 Rotor blade 8 Discharge area
4 Stationary cutting blade 9 Strands
5 Feeding device
Figure 1 - Example of a strand pelletiser
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EN 12012-2:2001 (E)
Key
1 Cutting chamber 6 Feeding area
2 Rotor 7 Discharge area
3 Stationary cutting blade 8 Strands
4 Die plate 9 Start-up position of start–up device
5 Feeding device 10 Cutting operation position of start-up device
Figure 2 - Example of a strand pelletiser with start-up device
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EN 12012-2:2001 (E)
4 List of significant hazards
4.1 Mechanical hazards
4.1.1 Cutting chamber
- crushing/shearing between the rotor and the housing;
- cutting/severing by the blades;
- ejection of parts of the machine or materials through the chamber.
4.1.2 Feeding device
- drawing-in by moving parts of the feeding devices;
- entanglement when material is fed manually.
4.1.3 Feeding area
- drawing-in and crushing between the feed rolls.
4.1.4 Discharge area:
- ejection of material or parts of the machine.
4.1.5 Start-up device:
- crushing between die plate and strand guiding device;
- crushing/shearing between the strand guiding device and the feeding area;
- crushing/shearing by dangerous movements of movable elements of the strand guiding device.
4.2 Hazards due to noise
Noise can cause:
- hearing damage;
- accidents due to interference with speech communication or
- accidents due to interference with the perception of acoustic signals.
4.3 Thermal hazards
Burns or scalds due to
- hot surfaces of the machine;
- hot temperature of the material and the cooling medium.
4.4 Hazards caused by water overflow
- water ingress into electrical equipment
4.5 Electrical hazards
- electric shock or burns due to direct contact with live conductive parts, or with parts that have
become live due to electrical fault.
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EN 12012-2:2001 (E)
5 Safety requirements and/or protective measures
Machinery shall comply with the safety requirements and/or protective measures of this clause. In
addition, the machine shall be designed according to the principles of EN 292 for hazards relevant but
not significant, which are not dealt with by this document (e.g. sharp edges).
5.1 Mechanical hazards
5.1.1 Cutting chamber
5.1.1.1 Strength
The chamber shall be able to resist stresses due to normal operation and which may result from:
- unexpected breaking or loosening of a blade during rotation
- foreign bodies in the material, or other objects.
5.1.1.2 Access to the cutting chamber
Access to the cutting chamber shall not be possible until motion of the rotor and feeding rolls has
ceased. This shall be achieved by an interlocking guard with guard locking in accordance with 3.6 of
EN 953:1997 and EN 1088:1995; the safety related parts of the control system shall be category 3 of
EN 954-1:1996.
5.1.1.3 Access through the discharge area to the cutting chamber
Access to the cutting chamber through the discharge area shall be prevented by design taking into
consideration the safety distances of EN 294:1992, table 2.
5.1.1.4 Access openings for maintenance or cleaning operations
Access openings in the chamber required for maintenance or cleaning operations shall be protected
by interlocking guards with guard locking in accordance with 3.6 of EN 953:1997 and EN 1088:1995;
the safety related parts of the control system shall be category 3 of EN 954-1:1996.
5.1.2 Feeding device
5.1.2.1 Access to moving parts of a feeding device
If a feeding device is fitted to the machine access to the moving parts shall be prevented by:
- fixed guards in accordance with 3.2 of EN 953:1997, or
- interlocking guard with guard locking in accordance with 3.6 of EN 953:1997 and EN 1088:1995;
the safety related parts of the control system shall be category 3 of EN 954-1:1996, or
- a combination of the two.
5.1.2.2 Prevention of entanglement
If the machine is being fed manually a mechanically actuated trip device in accordance with 3.23.5 of
EN 292-1:1991 shall be provided at the feed opening to stop the feeding in of the strands when
subjected to a force of more than 150 newtons. The safety related parts of the trip device shall be
category 3 of EN 954-1:1996.
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EN 12012-2:2001 (E)
5.1.3 Feeding area
The opening giving access to the feeding rolls shall be so designed to avoid the possibility of upper
limbs reaching the moving parts in accordance with EN 294:1992, tables 2, 3 or 4.
5.1.4 Discharge area
The discharge opening shall be designed to resist stresses due to unexpected breaking or loosening
of the blades during rotation and to prevent the ejection of parts of the machinery.
5.1.5 Start-up device
Access to the moving parts shall be prevented by:
- fixed guards in accordance with 3.2 of EN 953:1997, or
- interlocking guards in accordance with 3.5 of EN 953:1997 or interlocking guards with guard
locking in accordance with 3.6 of EN 953:1997 and EN 1088:1995; the safety related parts of the
control system shall be category 1 of EN 954-1:1996, or
- a combination of them.
5.2 Hazards due to noise
5.2.1 Noise reduction at source by design
Wh
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