SIST EN 12301:2000+A1:2008
(Main)Plastics and rubber machines - Calenders - Safety requirements
Plastics and rubber machines - Calenders - Safety requirements
This European standard specifies safety requirements relating to the design and construction of multi-roll calenders intended for the processing of rubber or plastics.
This standard concerns the calender alone including all components fixed to its frame.
Annex A shows examples of various types of calenders and annex B shows examples of calendaring processes.
The following machines are excluded:
- two-roll calenders forming an integral unit with an extruder (roller head);
- two or three-roll polishing , laminating or embossing units (which are not calenders) installed downstream of extruders in film processing lines.
This standard deals with the significant hazards listed in clause 4.
The following hazards are not dealt with:
- hazards generated by the materials being processed (see informative annex C);
- hazards generated by the processing of explosive materials, or materials which give rise to an explosive atmosphere;
- fire hazards due to ignition of flammable materials by contact with hot parts of the calender (e.g. in case of oil leakage);
- hazards due to electromagnetic, laser or ionising radiation;
- hazards generated if the calender is installed in an explosive atmosphere.
This standard applies to machinery manufactured after the date of approval of this standard by CEN.
Kunststoff- und Gummimaschinen - Kalander - Sicherheitsanforderungen
Diese Europäische Norm spezifiziert die sicherheitstechnischen Anforderungen für Konzipierung und Bau von Mehrwalzenkalandern zur Verarbeitung von Gummi und Kunststoffen.
Diese Norm betrifft den Kalander selbst sowie die auf seinem Ständer befestigten Vorrichtungen.
Anhang A zeigt Beispiele verschiedener Kalanderbauarten und Anhang B Beispiele für Kalandrierverfahren.
Nicht behandelt werden folgende Maschinen:
- Zweiwalzenkalander, die mit einem Extruder eine Einheit bilden (Roller head),
- Zwei- oder Dreiwalzen-Glättmaschinen und/oder Prägemaschinen (die keine Kalander sind), die Extrudern in Folienverarbeitungsanlagen nachgeschaltet sind.
Diese Norm behandelt die in Abschnitt 4 aufgelisteten signifikanten Gefährdungen.
Nicht behandelt werden folgende Gefährdungen:
- Gefährdungen, die durch die zu verarbeitenden Materialien entstehen (siehe informativen Anhang C),
- Gefährdungen, die bei der Verarbeitung von explosionsfähigen Materialien oder von Materialien, die eine explosible Atmosphäre erzeugen, entstehen,
- Brandgefahr durch Entzündung brennbarer Materialien durch Kontakt mit heißen Teilen des Kalanders (z. B. im Fall von Öl-Leckage),
- Gefährdungen durch elektromagnetische Strahlung, Laserstrahlung oder ionisierende Strahlung,
- Gefährdungen, falls der Kalander in explosiblen Atmosphären installiert wird.
Diese Norm gilt für Maschinen, die nach dem Annahmedatum der Norm durch CEN hergestellt worden sind.
Machines pour les matières plastiques et le caoutchouc - Calandres - Prescriptions de sécurité
Stroji za predelavo gume in plastike - Kalandri - Varnostne zahteve
General Information
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Stroji za predelavo gume in plastike - Kalandri - Varnostne zahteveKunststoff- und Gummimaschinen - Kalander - SicherheitsanforderungenMachines pour les matières plastiques et le caoutchouc - Calandres - Prescriptions de sécuritéPlastics and rubber machines - Calenders - Safety requirements83.200Oprema za gumarsko industrijo in industrijo polimernih materialovEquipment for the rubber and plastics industriesICS:Ta slovenski standard je istoveten z:EN 12301:2000+A1:2008SIST EN 12301:2000+A1:2008en01-november-2008SIST EN 12301:2000+A1:2008SLOVENSKI
STANDARD
SIST EN 12301:2000+A1:2008
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12301:2000+A1
September 2008 ICS 83.200 Supersedes EN 12301:2000 English Version
Plastics and rubber machines - Calenders - Safety requirements Machines pour les matières plastiques et le caoutchouc - Calandres - Prescriptions de sécurité
Kunststoff- und Gummimaschinen - Kalander - Sicherheitsanforderungen This European Standard was approved by CEN on 24 April 2000 and includes Amendment 1 approved by CEN on 8 June 2008.
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 CEN 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 CEN Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, 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 © 2008 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12301:2000+A1:2008: ESIST EN 12301:2000+A1:2008
EN 12301:2000+A1:2008 (E) 2 Contents Page Foreword.3 Introduction.4 1 Scope.4 2 Normative references.4 3 Terms and definitions.6 4 List of hazards.12 4.1 Mechanical hazards.12 4.2 Electrical hazards.14 4.3 Thermal hazards.14 4.4 Hazards due to noise.14 4.5 Hazards generated by neglecting ergonomic principles.14 4.6 Hazards due to failure of energy supply.14 4.7 Hazards due to failure of the control systems.14 4.8 Slip, trip and fall hazards.15 5 Safety requirements and/or measures.15 5.1 Mechanical hazards.15 5.2 Electrical hazards.27 5.3 Thermal hazards.28 5.4 Hazards due to noise.28 5.5 Hazards generated by neglecting ergonomic principles.29 5.6 Hazards due to failure of energy supply.29 5.7 Hazards due to failure of the control systems.29 5.8 Slip, trip and fall hazards.30 6 Verification of the safety requirements and/or measures.30 7 Information for use.34 7.1 Instruction handbook.34 7.2 Marking.35 Annex A (informative)
Examples of different types of calenders.36 Annex B (informative)
Examples of calendering processes.37 Annex C (informative)
Hazards generated by the materials being processed.39 Annex D (informative)
Calculation of dimension L of the trapping zone (for rolls of equal diameters).40 Annex E (informative)
Fixed guards at the trapping zone.41 Annex F (informative)
Example of a particular type of guard with limited movement preventing access to the trapping zone.42 Annex ZA (informative)
!!!!Relationship between this European Standard and the Essential Requirements of EU Directive 98/37/EC"""".43 Annex ZB (informative)
!!!!Relationship between this European Standard and the Essential Requirements of EU Directive 2006/42/EC"""".44 Bibliography.45
SIST EN 12301:2000+A1:2008
EN 12301:2000+A1:2008 (E) 3 Foreword This document (EN 12301:2000+A1:2008) has been prepared by Technical Committee CEN/TC 145 "Plastics and rubber machines", 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 March 2009, and conflicting national standards shall be withdrawn at the latest by December 2009. This document includes Amendment 1, approved by CEN on 2008-06-08. The main changes compared to the previous version are: • modification of the main element of the title. • editorial modification of Annex ZA.
• addition of Annex ZB. • editorial changes of EN 292-1:1991 to EN ISO 12100-1:2003 and of EN 292-2:1991 to EN ISO 12100-2:2003 in the following clauses and sub-clauses: Introduction, 2, 5.1.1.3.3, 5.1.1.7, 5.1.1.8, 5.1.1.10, 5.2.2, 5.3.2, 5.4.1, 5.4.2, 5.8, Table 1, 7, 7.1, 7.1.1d), 7.2, C.2.
• minor changes of sub-clauses 5.4.2, second indent and 7.2, second and third indents.
This document supersedes EN 12301:2000. The start and finish of text introduced or altered by amendment is indicated in the text by tags ! ". 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 Annexes ZA and ZB, which are integral parts of this document." The annexes A to F are informative. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom
SIST EN 12301:2000+A1:2008
EN 12301:2000+A1:2008 (E) 4 Introduction This European standard is a type C standard as described in !EN ISO 12100". The extent to which hazards are covered is indicated in the scope of this standard. In addition, machinery shall comply as appropriate with !EN ISO 12100" for hazards which are not covered by this standard. 1 Scope This European standard specifies safety requirements relating to the design and construction of multi-roll calenders intended for the processing of rubber or plastics. This standard concerns the calender alone including all components fixed to its frame. Annex A shows examples of various types of calenders and annex B shows examples of calendaring processes. The following machines are excluded: two-roll calenders forming an integral unit with an extruder (roller head); two or three-roll polishing , laminating or embossing units (which are not calenders) installed downstream of extruders in film processing lines. This standard deals with the significant hazards listed in clause 4. The following hazards are not dealt with: hazards generated by the materials being processed (see informative annex C); hazards generated by the processing of explosive materials, or materials which give rise to an explosive atmosphere; fire hazards due to ignition of flammable materials by contact with hot parts of the calender (e.g. in case of oil leakage); hazards due to electromagnetic, laser or ionising radiation; hazards generated if the calender is installed in an explosive atmosphere. This standard applies to machinery 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. !deleted text" SIST EN 12301:2000+A1:2008
EN 12301:2000+A1:2008 (E) 5 EN 294:1992, Safety of machinery - Safety distances to prevent danger zones being reached by the upper limbs EN 349:1993, Safety of machinery - Minimum gaps to avoid crushing of parts of the human body EN 418:1992, Safety of machinery - Emergency stop equipment, functional aspects - Principles for design EN 457:1992, Safety of machinery - Auditory danger signals - General requirements, design and testing (ISO 7731:1986, modified) EN 563:1994, Safety of machinery - Temperature of touchable surfaces - Ergonomics data to establish temperature limit values for hot surfaces EN 614-1, Safety of machinery - Ergonomic design principles - Part 1: Terminology and general principles 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 999:1998, Safety of machinery – The positioning of protective equipment in respect of approach speeds of parts of the human body EN 1037:1995, Safety of machinery - Prevention of unexpected start-up EN 1088:1995, Safety of machinery - Interlocking devices associated with guards - Principles for design and selection EN 1760-1:1997, Safety of machinery - Pressure sensitive protective devices - Part 1: General principles for the design and testing of pressure sensing mats and pressure sensitive floors prEN 12437-1:1996, Safety of machinery - Permanent mean
of access to machines and industrial plants – Part 1: Choice of a fixed means of access between two levels prEN 12437-2:1996, Safety of machinery - Permanent means of access to machines and industrial plants – Part 2: Working platforms and gangways prEN 12437-3:1996, Safety of machinery - Permanent means of access to machines and industrial plants – Part 3: Stairways, stepladders and guard-rails prEN 12437-4:1996, Safety of machinery - Permanent means of access to machines and industrial plants – Part 4: Fixed ladders 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 61310-1:1995, Safety of machinery - Indication, marking and actuation - Part 1: Requirements for visual, auditory and tactile signals (IEC 61310-1:1995) EN 61496-1:1998, Safety of machinery - Electro-sensitive protective equipment - Part 1: General requirements and tests (IEC 61496-1:1997) EN ISO 3743-1:1995, Acoustics - 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) SIST EN 12301:2000+A1:2008
EN 12301:2000+A1:2008 (E) 6 EN ISO 3743-2:1996, Acoustics - 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 4871, Acoustics - Determination 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) EN ISO 11201:1995, Acoustics - 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 11202:1995, Acoustics - 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 11203:1995, Acoustics - 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 11204:1995, Acoustics - 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) prEN ISO 11688-2:1999, Acoustics - Recommended practice for the design of low-noise machinery and equipment- Part 2: Introduction to the physics of low-noise design (ISO/TR 11688-2:1998) !EN ISO 12100-1:2003, Safety of machinery - Basic concepts, general principles for design - Part 1: Basic terminology, methodology (ISO 12100-1:2003)" !EN ISO 12100-2:2003, Safety of machinery - Basic concepts, general principles for design - Part 2: Technical principles (ISO 12100-2:2003)" ISO/DIS 3747:1998, Acoustics - Determination of sound power levels of noise sources using sound pressure - Comparison method for use in situ
3 Terms and definitions For the purposes of this standard the following definitions apply: SIST EN 12301:2000+A1:2008
EN 12301:2000+A1:2008 (E) 7
3.1 calender a machine for processing rubber, plastics, solutions or dispersions by continuous drawing between two or more rolls. The rolls are supported at both ends by a frame. The processing operations may be, for example: continuous calendering of sheets or profiles of rubber or plastics; application of one or more sheet(s) or layer(s) onto a web; laminating of two or more sheets of rubber or plastics under pressure or by using heat or adhesive; embossing of plastics. Figure 1 shows a typical calendering sequence and the positions of most of the components and zones defined hereafter. In this illustration the reference numbers correspond to the subclause numbers of clause 3.
SIST EN 12301:2000+A1:2008
EN 12301:2000+A1:2008 (E) 8
3.2 Frame 3.5.3 Feeding devices 3.3 Calender rolls 3.8 Nip adjusting devices 3.4 Secondary rollers 3.9 Feed zones 3.5.1 Cutting devices 3.10 Discharge zone 3.5.2 Stock guides 3.11 Working zones Figure 1 — Example of a 4-roll calender showing the materials circuit for bilateral coating of (textile or metallic) fabric or cords
Annex A shows examples of various types of calenders. SIST EN 12301:2000+A1:2008
EN 12301:2000+A1:2008 (E) 9 Annex B shows examples of various calendering processes. 3.2 frame fixed part of the calender housing the calender roll bearings, some of the secondary roller bearings and ancillary equipment 3.3 calender roll a roll with an even, polished or sandblasted surface which is held in place and positioned in relation to other calender rolls by guide bearings in the frame. The roll may be counterbored or drilled to enable its temperature to be controlled by fluid circulation 3.4 secondary roller a roller, other than a calender roll, which is used in the calendering process. It may be driven and may be temperature regulated. Examples of secondary rollers are: pressure rollers, embossing rollers, filament guide rollers, tension rollers, stripper rollers, crease removing rollers, take-off rollers. 3.5 ancillary equipment the following ancillary equipment is dealt with in this standard: 3.5.1 cutting equipment equipment for trimming the edges of the sheet to a specified width. This equipment can also cut the sheet into two or more widths. There are different types of cutting equipment for example: fixed knives (wires or blades); rotating knives (cutting discs). 3.5.2 stock guides devices located on either side of the feed zone which determine the width of the sheet to be calendered and retain the stock thus preventing it from extending beyond the normal working area 3.5.3 feeding device equipment for feeding and distributing the stock in the feed zone for example: table, grid, chute, conveyor, reciprocating feed conveyor 3.6 calender roll speed circumferential speed of rolls v expressed in m/min. The following speeds are used in this standard:
slow speed vl: roll speed for production start-up; maximum speed vmax: highest roll speed given by the manufacturer; production speed vp: speed between vl and vmax; reduced speed vr: roll speed used when approach by the operator is necessary for production purposes 3.7 stopping angle the angle through which the fastest calender roll rotates during the time between actuation of the safety device or emergency stop actuator and bringing the rolls to rest by braking SIST EN 12301:2000+A1:2008
EN 12301:2000+A1:2008 (E) 10 This angle is measured with the calender running empty and the cylinders rotating at maximum speed vmax (see 3.6). The following stopping angles are used in this standard: specified stopping angle α : the stopping angle specified by the machine manufacturer; maximum stopping angle αmax: the upper limit value of the stopping angle; reduced stopping angle αr: the stopping angle achieved when the rolls are rotating at the reduced speed vr. 3.8 nip adjusting device a device for changing the relative position of the rolls to each other by increasing or decreasing the roll nip 3.9 feed zone zone in which stock (rubber or plastic etc) and/or material (cords, web, fabric etc) is fed into the calender. A calender may have one or more feed zones 3.10 discharge zone zone in which the calendered product is discharged 3.11 working zone area of the calender where the operators carry out their normal duties. A calender may have several working zones 3.12 trapping zone at the calender rolls a trapping zone exists when two calender rolls close to each other rotate in opposite directions towards the nip, thus creating a drawing-in and crushing hazard The trapping zone is the volume circumscribed by the length X of the rolls and by the cross-section dimensioned S and L (see figure 2): S shall be taken as 12 mm when the rolls are theoretically in contact, irrespective of the roll diameter; L = D6; where the roll diameters are different D shall be taken as the larger diameter. An example for the calculation of L is given in annex D; L remains constant irrespective of the nip between the rolls.
SIST EN 12301:2000+A1:2008
EN 12301:2000+A1:2008 (E) 11
X, S and L: Dimensions defining the trapping zone Figure 2 — Trapping zone at the calender rolls 3.13 danger zone at the calender rolls a danger zone exists on a calender when access to the trapping zone defined in 3.12 is not prevented by a protective structure placed in the immediate vicinity of the trapping zone. The danger zone is the volume at the inrunning side of the rolls circumscribed by the length X of the rolls and the shaded cross-section (figures 3 and 7a). This section is delimitated by: the line dimensioned S at the entrance to the trapping zone (see 3.12); the two arcs of circle on the calender rolls corresponding with the specified stopping angle α (see 3.7); the arc of a circle whose centre is the middle of the line dimensioned S and whose radius F is equivalent to the length of the arcs of circle on the calender rolls corresponding with the specified stopping angle α.
SIST EN 12301:2000+A1:2008
EN 12301:2000+A1:2008 (E) 12
Figure 3 — Danger zone at the calender rolls 4 List of hazards 4.1 Mechanical hazards Figure 4 illustrates the locations of the principal mechanical hazards, shown as an example on a 4-roll calender. In this illustration the reference numbers correspond to the sub-clause numbers of clause 4.
SIST EN 12301:2000+A1:2008
EN 12301:2000+A1:2008 (E) 13
Figure 4 — Locations of principal mechanical hazards shown as an example on a 4-roll calendar 4.1.1 Hazard of drawing-in and/or crushing between the calender rolls or between a calender roll and the material during start-up; in forward movement during production operations; during reverse operation; during cleaning or polishing operations; during machine setting, process changeover, fault finding, and maintenance operations. SIST EN 12301:2000+A1:2008
EN 12301:2000+A1:2008 (E) 14 4.1.2 Hazard of drawing-in and/or crushing at secondary rollers 4.1.3 Hazards due to ancillary equipment 4.1.3.1 Hazard of cutting due to the cutting equipment 4.1.3.2 Hazard of shearing and/or crushing between the stock guides and the calender rolls 4.1.3.3 Hazard of impact and/or crushing due to the reciprocating feed conveyor 4.2 Electrical hazards 4.2.1 Electrical shock or burns caused by direct or indirect contact with live conductive parts 4.2.2 Electrical shock, or fire due to electrostatic discharge 4.3 Thermal hazards 4.3.1 Burns from contact with the hot parts of the calender or hot materials 4.3.2 Scalds from ejection of heat transfer fluid as a result of rupture of hoses and/or hose assemblies 4.3.3 Burns from infra-red radiation 4.4 Hazards due to noise Hazards resulting from high noise levels, for example hearing impairment, or interference with speech communications, or with the perception of acoustic signals. 4.5 Hazards generated by neglecting ergonomic principles Hazards resulting from excessive manual effort when changing the embossing roll or roller. 4.6 Hazards due to failure of energy supply Hazard of drawing-in and/or crushing due to malfunctioning of safety devices following failure of the energy supply. 4.7 Hazards due to failure of the control systems Mechanical hazards due to failure of safety related parts of the control systems. Such hazards can result for example, from: unexpected start-up; failure of the control modes for setting, start-up, process changeover, cleaning, fault finding, maintenance, reverse operation; unexpected speed change; failure of one or more safety devices. SIST EN 12301:2000+A1:2008
EN 12301:2000+A1:2008 (E) 15 4.8 Slip, trip and fall hazards Injury caused by slipping, tripping and falling on or from working positions or the means of access thereto. 5 Safety requirements and/or measures 5.1 Mechanical hazards 5.1.1 Hazards at the calender rolls 5.1.1.1 Preventing access to the trapping zone defined in 3.12 by means of safeguarding placed at the entrance of the trapping zone Access to the trapping zone shall be prevented by one or more of the following: a) A fixed guard in accordance with 3.2 of EN 953: 1997 extending along the whole length of the rolls and meeting the following two criteria: the gap between the guard and the surface of the roll shall not exceed 6 mm; the angle between the guard and the tangent to the surface of the roll shall not be less than 90°. Examples of layout are given in informative annexes E and F. Other profiles may be used but circular cross sections are prohibited. For a guard with openings the safety distances shall be in accordance with table 3 or table 4 of EN 294:1992. If this guard needs to be removed (for cleaning or setting operations, for example), it shall be designed as an interlocking guard with guard locking in accordance with 3.6 of EN 953: 1997. b) A feeding device positioned so that it acts as the above-mentioned fixed guard, associated with an interlock which shall allow the rolls to rotate only when the feeding device is in position. 5.1.1.2 Preventing access to the trapping zone by means of safeguarding placed outside the trapping zone Where the means of safeguarding specified in 5.1.1.1 to prevent access to the trapping zone cannot be used for processing reasons, access to that zone shall be prevented by one or more of the following: a) Guard to prevent access an interlocking guard with guard locking in accordance with 3.6 of EN 953:1997; or, an interlocking guard in accordance with 3.5 of EN 953:1997 and positioned in accordance with EN 999:1998. The type of interlocking device shall be selected in accordance with EN 1088:1995. b) Trip device to trigger stopping of the rolls when actuated a mechanically actuated trip device: 1) a trip bar (see 5.1.1.4); 2) other device e.g. a pressure sensing mat in accordance with EN 1760-1:1997, positioned in accordance with EN 999:1998. SIST EN 12301:2000+A1:2008
EN 12301:2000+A1:2008 (E) 16 a non-mechanically actuated trip device e.g. a photo-electric device in accordance with EN 61496-1:1998 positioned in accordance with EN 999:1998. The distances calculated in accordance with EN 999:1998 shall be measured from the entrance of the trapping zone. If an interlocking guard or a non-mechanically actuated trip device is positioned so that an operator can stand between the guard or trip device and the calender, additional safety measures (e.g. presence sensing devices) shall be provided to prevent restarting of the dangerous movement while an operator remains in that area. 5.1.1.3 Performance of the guards and safety devices listed in 5.1.1.2 5.1.1.3.1 Stopping of the calender rolls The opening of an interlocking guard or the actuation of a trip device, whether voluntary or involuntary, and by any part of the body, shall bring the rolls to rest by braking within the specified stopping angle α as defined in 3.7. Braking shall be started as soon as the finger tips of the operator r
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