FprEN 18143
(Main)Food processing machinery - Pizza dough sheeter machines - Safety and hygiene requirements
Food processing machinery - Pizza dough sheeter machines - Safety and hygiene requirements
1.1 This document specifies safety and hygiene requirements for the design and manufacture of pizza dough sheeters which:
a) are intended to be used:
1) for producing pizza dough bases in shops and craft activities (i.e. pizzerias, takeaway pizza shops, craft bakeries and/or pastries, catering facilities etc.);
2) for flattening and shaping lumps;
3) only for professional use;
4) by one operator at a time;
5) as standalone table-top machines only;
6) only with manual feeding of the lumps by gravity;
7) only with manual unloading of the flattened and enlarged lumps;
b) are fitted with:
1) at most two pairs of flattening rollers, the rollers of a pair having the same diameter and the same length;
2) flattening rollers having:
i. diameter ≤ 60 mm;
ii. fixed direction of the rotation such as to move the pizza dough from top to bottom;
iii. motor(s) for the rotation of the flattening rollers which transmit a power ≤ 0,50 kW to each pair of rollers.
1.2 The following relevant hazards are not covered by this document:
- hazards due to packaging, handling and transport;
- hazards due to ambiguous and/or not easily understandable information needed to control the machine.
A description of these machines is given in Annex A, and examples for positioning them are given in Annex C.
This document does not deal with any specific requirement on noise emitted from pizza dough sheeters as the generated noise does not cause a relevant hazard.
The significant hazards covered by this document are described in Annex B.
1.3 The following machines are excluded from the scope of this document:
- domestic (household) appliances;
- machines with automatic feeding of the lumps and/or unloading of the pizza bases;
- machines with feeding of the lumps other than by gravity;
- machines to process other products than pizza dough;
- bagel machines;
- dough sheeters (see EN 1674:2015);
- moulders (see EN 12041:2014);
- sheeters for pasta dough processing;
- experimental and testing machines under development by the manufacturer.
1.4 This document is not applicable to machines which are manufactured before the date of publication of this document by CEN.
Nahrungsmittelmaschinen - Pizzateig-Ausrollmaschinen - Sicherheits- und Hygieneanforderungen
1.1 Dieses Dokument legt Schutz- und Hygieneanforderungen für die Konstruktion und Herstellung von Pizzateigausrollmaschinen fest, die:
a) verwendet werden sollen:
1) zum Herstellen hauptsächlich von Pizzateigböden in Geschäften und Handwerksbetrieben (z. B. Pizzerien, Pizza-Imbissbuden, Handwerksbäckereien und/oder Feinbäckereien, Catering-Betrieben usw.);
2) zum Ebnen oder Vergrößern von Teigstücken;
3) ausschließlich für den professionellen Gebrauch;
4) durch jeweils einen Bediener;
5) nur als eigenes Tischgerät;
6) nur mit manueller Zufuhr der Pizzateigstücke durch Schwerkraft;
7) Nur mit Handentnahme der geebneten und vergrößerten Teigstücke;
b) ausgestattet sind mit:
1) nicht mehr als zwei Paaren von Glättwalzen, bei denen die Walzen eines Paares die gleichen Durchmesser und Länge aufweisen;
2) Glättwalzen mit:
i) Durchmessern von ≤ 60 mm;
ii) fester Drehrichtung beispielsweise zum Befördern des Pizzateigs von oben nach unten;
iii) Motor(en) zum Drehen der Glättwalzen, die eine Leistung von ≤ 0,50 kW auf jedes Walzenpaar übertragen
1.2 Die folgenden relevanten Gefährdungen werden in diesem Dokument nicht behandelt:
- Gefahren, die sich aus der Verwendung eines automatischen Lade- und/oder Entladesystems ergeben;
- Gefährdungen durch Verpackung, Handhabung und Transport;
- Gefahren aufgrund mehrdeutiger oder nicht leicht verständlicher zur Steuerung der Maschine benötigter Informationen.
Dieses Dokument behandelt keine spezifischen Anforderungen an die Geräuschemissionen von Pizzateigausrollmaschinen, da der erzeugte Lärm keine relevante Gefährdung darstellt.
Die von diesem Dokument behandelten signifikanten Gefährdungen sind in Anhang A beschrieben.
1.3 Die folgenden Maschinen liegen nicht im Anwendungsbereich dieses Dokuments:
- Haushaltsgeräte;
- Maschine mit automatischer Zufuhr der Pizzateigstücke und oder Entladen der Pizzaböden;
- Maschinen mit anderer Zufuhr der Klumpen als durch Schwerkraft;
- Maschinen zum Bearbeiten anderer Produkte als Pizzateig;
- Bagel-Maschinen;
- Teigausrollmaschinen (siehe EN 1674:2015);
- Langwirkmaschinen (siehe EN 12041:2014);
- Ausrollmaschinen zur Nudelteigverarbeitung;
- Versuchs- und Prüfmaschinen, die beim Hersteller in Entwicklung sind.
1.4 Dieses Dokument gilt nicht für Maschinen, die vor dem Datum der Veröffentlichung dieser Europäischen Norm hergestellt wurden.
Machines pour les produits alimentaires - Laminoirs pour pâte à pizza - Exigences relatives à la sécurité et l'hygiène
1.1 Le présent document spécifie les exigences en matière d'hygiène et de sécurité pour la conception et la fabrication de laminoirs pour pâte à pizza qui :
a) sont destinés à être utilisés :
1) pour produire principalement des bases de pâte à pizza dans les magasins et dans le cadre d'activités artisanales (c'est-à-dire des pizzerias, des pizzerias à emporter, des boulangeries et/ou pâtisseries artisanales, la restauration, etc.) ;
2) pour le laminage et l'élargissement des morceaux de pâte ;
3) uniquement pour un usage professionnel ;
4) par un opérateur à la fois ;
5) comme machines sur table autonomes uniquement ;
6) uniquement avec alimentation manuelle des morceaux de pâte à pizza par gravité ;
7) uniquement avec le déchargement manuel des morceaux de pâte à pizza laminés et agrandis ;
b) sont équipés :
1) de deux paires de rouleaux laminoirs tout au plus, les rouleaux d'une même paire ayant le même diamètre et la même longueur ;
2) de rouleaux laminoirs ayant :
i. diamètre ≤ 60 mm ;
ii. direction fixe de la rotation de sorte que le déplacement de la pâte à pizza s'effectue de haut en bas ;
iii. moteur(s) pour la rotation des rouleaux laminoirs qui transmettent une puissance ≤ 0,50 kW à chaque paire de rouleaux.
1.2 Le présent document ne couvre pas les phénomènes dangereux pertinents suivants :
- phénomènes dangereux résultant de l'utilisation d'un système de chargement et/ou de déchargement automatique ;
- phénomènes dangereux dus à l'emballage, à la manutention et au transport ;
- phénomènes dangereux dus à des informations ambiguës et/ou difficilement compréhensibles nécessaires pour commander la machine.
Le présent document ne traite d'aucune exigence spécifique relative au bruit émis par les laminoirs pour pâte à pizza, car le bruit généré n'engendre pas de phénomène dangereux pertinent.
Les phénomènes dangereux significatifs couverts par le présent document sont décrits à l'Annexe A.
1.3 Les machines suivantes sont exclues du domaine d'application du présent document :
- appareils ménagers ;
- machines avec alimentation automatique des morceaux de pâte à pizza et/ou déchargement des bases de pizza ;
- machines dont l'alimentation des pâtons se fait autrement que par gravité ;
- machines destinées à traiter d'autres produits que la pâte à pizza ;
- façonneuses pour bagel ;
- laminoirs à pâte (voir EN 1674:2015) ;
- façonneuses (voir EN 12041:2014) ;
- laminoirs destinés à traiter des pâtes alimentaires ;
- machines expérimentales et d'essais, en cours de mise au point par le fabricant.
1.4 Le présent document ne s'applique pas aux machines fabriquées avant la date de publication de la présente Norme européenne.
Stroji za predelavo hrane - Stroji za valjanje testa za pico - Varnostne in higienske zahteve
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-januar-2025
Stroji za predelavo hrane - Stroji za valjanje testa za pico - Varnostne in higienske
zahteve
Food processing machinery - Pizza dough sheeter machines - Safety and hygiene
requirements
Nahrungsmittelmaschinen - Pizzateig-Ausrollmaschinen - Sicherheits- und
Hygieneanforderungen
Machines pour les produits alimentaires - Laminoirs pour pâte à pizza - Exigences
relatives à la sécurité et l'hygiène
Ta slovenski standard je istoveten z: prEN 18143
ICS:
67.260 Tovarne in oprema za Plants and equipment for the
živilsko industrijo food industry
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
DRAFT
EUROPEAN STANDARD
prEN 18143
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2024
ICS 67.260
English Version
Food processing machinery - Pizza dough sheeter
machines - Safety and hygiene requirements
Machines pour les produits alimentaires - Laminoirs Nahrungsmittelmaschinen - Pizzateig-
pour pâte à pizza - Exigences relatives à la sécurité et Ausrollmaschinen - Sicherheits- und
l'hygiène Hygieneanforderungen
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 153.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CEN 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-CENELEC
Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 18143:2024 E
worldwide for CEN national Members.
prEN 18143:2024 (E)
Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 7
3 Terms, definitions and description . 8
3.1 Terms and definitions . 8
3.2 Description . 9
3.2.1 Description of the machine . 9
3.2.2 Description of the process . 12
4 Safety requirements and/or protective/risk reduction measures . 15
4.1 General. 15
4.2 Mechanical hazards . 15
4.2.1 General requirements for rollers. 15
4.2.2 Zone 1 – Hazard of drawing-in and crushing between the counterrotating feed intake
for upper pair of rollers (machines with two pairs of rollers) or pair of rollers
(machines with a single pair of rollers) . 16
4.2.3 Zone 2 – Hazard of drawing-in between a rotating roller and other parts . 20
4.2.4 Zone 3 – Hazard of drawing-in between the counterrotating lower pair of rollers (only
for machines with two pairs of rollers) . 22
4.2.5 Zone 4 – Hazards of drawing in, shearing, crushing or entanglement by transmission
system . 24
4.2.6 Zone 5 – Hazards of crushing, shearing, impact due to loss of stability of the machine
................................................................................................................................................................... 24
4.3 Electrical hazards . 25
4.3.1 Motor enclosures . 25
4.3.2 Electrical requirements of controls . 25
4.3.3 Electrical tests . 25
4.3.4 Electrical energy supply disconnecting device . 25
4.3.5 Hazards from automatic start and/or unexpected start . 26
4.3.6 Hazards from automatic start and/or unexpected start . 26
4.4 Hazards generated by neglecting ergonomic principles . 26
4.5 Hazards generated by neglecting hygienic principles . 29
4.5.1 General. 29
4.5.2 Food area . 29
4.5.3 Splash area . 29
4.5.4 Non-food area . 29
5 Verification of safety and hygiene requirements and/or protective/risk reduction
measures . 30
6 Information for use . 31
6.1 General. 31
6.2 Signals and warning devices . 31
6.3 Instruction handbook. 32
6.4 Marking . 34
prEN 18143:2024 (E)
Annex A (informative) List of significant hazards . 35
Annex B (informative) Examples of positioning of pizza dough sheeters . 38
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of Directive 2006/42/CE aimed to be covered . 39
Annex ZB (informative) Relationship between this European Standard and the essential
requirements of regulation (EU) 2023/1230 aimed to be covered . 41
Bibliography . 43
prEN 18143:2024 (E)
European foreword
This document (prEN 18143:2024) has been prepared by Technical Committee CEN/TC 153 “Machinery
intended for use with foodstuffs and feed”, the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
This document has been prepared under a standardization request addressed to CEN by the European
Commission. The Standing Committee of the EFTA States subsequently approves these requests for its
Member States.
For the relationship with EU Legislation, see informative Annexes ZA and ZB, which are integral parts of
this document.
prEN 18143:2024 (E)
Introduction
This document is a type-C-standard as stated in EN ISO 12100:2010.
The machinery concerned and the extent to which hazards, hazardous situations and events are covered
are indicated in the scope of this European Standard. 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.
prEN 18143:2024 (E)
1 Scope
1.1 This document specifies safety and hygiene requirements for the design and manufacture of pizza
dough sheeters which:
a) are intended to be used:
1) for producing mainly pizza dough bases in shops and craft activities (i.e. pizzerias, takeaway
pizza shops, craft bakeries and/or pastries, catering facilities, etc.);
2) for flattening and enlarging pieces of dough;
3) only for professional use;
4) by one operator at a time;
5) as standalone table-top machines only;
6) only with manual feeding of the pieces of pizza dough by gravity;
7) only with manual unloading of the flattened and enlarged pieces of pizza dough;
b) are fitted with:
1) at most two pairs of flattening rollers, the rollers of a pair having the same diameter and the
same length;
2) flattening rollers having:
i. diameter ≤ 60 mm;
ii. fixed direction of the rotation such as to move the pizza dough from top to bottom;
iii. motor(s) for the rotation of the flattening rollers which transmit a power ≤ 0,50 kW to each
pair of rollers
1.2 The following relevant hazards are not covered by this document:
— hazards arising from the use of an automatic loading and/or unloading system;
— hazards due to packaging, handling and transport;
— hazards due to ambiguous and/or not easily understandable information needed to control the
machine.
This document does not deal with any specific requirement on noise emitted from pizza dough sheeters
as the generated noise does not cause a relevant hazard.
The significant hazards covered by this document are described in Annex A.
1.3 The following machines are excluded from the scope of this document:
— domestic (household) appliances;
— machines with automatic feeding of the pizza dough pieces and/or unloading of the pizza bases;
— machines with feeding of the lumps other than by gravity;
prEN 18143:2024 (E)
— machines to process other products than pizza dough;
— bagel machines;
— dough sheeters (see EN 1674:2015);
— moulders (see EN 12041:2014);
— sheeters for pasta dough processing;
— experimental and testing machines under development by the manufacturer.
1.4 This document is not applicable to machines which are manufactured before the date of
publication of this European Standard.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 614-1:2006+A1:2009, Safety of machinery — Ergonomic design principles — Part 1: Terminology and
general principles
EN 1672-2:2020, Food processing machinery — Basic concepts — Part 2: Hygiene and cleanability
requirements
EN 60204-1:2018, Safety of machinery — Electrical equipment of machines — Part 1: General
requirements (IEC 60204-1:2016)
EN 60529:1991, Degrees of protection provided by enclosures (IP code) (IEC 60529:1989)
EN 61310-1:2008, Safety of machinery — Indication, marking and actuation — Part 1: Requirements for
visual, acoustic and tactile signals (IEC 61310-1:2007)
EN ISO 7010:2020, Graphical symbols — Safety colours and safety signs — Registered safety signs
(ISO 7010:2019, Corrected version 2020-06)
EN ISO 12100:2010, Safety of machinery — General principles for design — Risk assessment and risk
reduction (ISO 12100:2010)
EN ISO 13849-1:2023, Safety of machinery — Safety-related parts of control systems — Part 1: General
principles for design (ISO 13849-1:2023)
EN ISO 13856-2:2013, Safety of machinery — Pressure-sensitive protective devices — Part 2: General
principles for design and testing of pressure-sensitive edges and pressure-sensitive bars (ISO 13856-2:2013)
EN ISO 13857:2019, Safety of machinery — Safety distances to prevent hazard zones being reached by
upper and lower limbs (ISO 13857:2019)
As impacted by EN 60529:1991/A1:2000, EN 60529:1991/A2:2013, EN 60529:1991/corrigendum May 1993,
EN 60529:1991/A2:2013/AC:2019-02 and EN 60529:1991/AC:2016-12.
As impacted by EN ISO 7010/A1:2020, EN ISO 7010/A2:2022 and EN ISO 7010/A3:2022.
prEN 18143:2024 (E)
EN ISO 14118:2018, Safety of machinery — Prevention of unexpected start-up (ISO 14118:2017)
EN ISO 14119:2013, Safety of machinery — Interlocking devices associated with guards — Principles for
design and selection (ISO 14119:2013)
EN ISO 14120:2015, Safety of machinery — Guards — General requirements for the design and
construction of fixed and movable guards (ISO 14120:2015)
3 Terms, definitions and description
For the purposes of this document, the terms and definitions given in EN ISO 12100:2010 and the
following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp/
— IEC Electropedia: available at https://www.electropedia.org/
3.1 Terms and definitions
3.1.1
pizza dough
homogeneous mass of soft dough obtained by mixing various food ingredients
Note 1 to entry: Most important ingredients are flour and water to achieve an adequate softness of the dough such
that it can be shaped into discs and/or ovals with a very large surface compared to the thickness.
3.1.2
lump
pre-portioned piece of pizza dough
Note 1 to entry: It can have a totally irregular shape or have been previously treated to give it an approximately
regular shape (roundish, oval, rectangular, etc.).
3.1.3
flattening
reduction of the thickness of a lump passing in the space between two counter-rotating rollers and
consequent enlargement of its upper and lower surface
3.1.4
shaping
reduction of the thickness of a pre-flattened lump for achieving an as much regular as possible shape of
the flattened lump through an accurate adjustment of the gap between two counter-rotating rollers
Note 1 to entry: The shape of the resulting flattened lump depends mostly on the form of the lump before being
flattened (for instance, a rounded lump can be transformed into an oval-shaped disc, a more or less oval-shaped
lump can be transformed into a flattened more rounded or even more oval shape depending on the side of insertion
into the rollers).
3.1.5
manual operation
process in which the piece of dough is manually placed to the inlet of the machine by action of the
operator
prEN 18143:2024 (E)
3.1.6
pair of rollers
two cylinders with parallel axis
3.1.7
scraper
device used for removing residual of dough and flour from the roller
3.1.8
fixed distance guard
guard which does not completely enclose a hazard zone, but which prevents or reduces access by virtue
of its dimensions and its distance from the hazard zone (for example perimeter fence or tunnel guard)
and which is affixed in such a manner (for example, by screws, nuts, and welding) that it can only be
opened or removed by the use of tools or by destruction of the means by which the guard is affixed
[SOURCE: EN ISO 14120:2015, 3.2 and 3.2.2]
3.2 Description
3.2.1 Description of the machine
This document covers the following types of machines:
a) machines with a single pair of rollers (see Figure 1);
b) machines with two pairs of rollers, the upper pair inclined with respect to the lower pair (see
Figure 2); these machines are provided with a tilting device, placed between the two pairs of rollers,
whose functioning is ensured by the mass of dough coming out from the upper roller pair and falling
toward the lower rollers feed zone (it is not motor-driven and returns in its resting position by means
of a very weak spring);
c) machines with two parallel pairs of rollers (see Figure 3); these machines are not provided with a
tilting device.
prEN 18143:2024 (E)
Key
1 Lump inlet
2 Flattened lump outlet
3 Rollers
4 Scrapers (optional)
5 Control devices
6 Device for adjusting the gap between the rollers
Figure 1 — Single pair of rollers machine
prEN 18143:2024 (E)
Key
1 Lump inlet of the upper pair of rollers
2 Outlet of the flattened lump from the first pair of rollers
3 Flattened lump inlet of the lower pair of rollers
4 Outlet of the flattened dough from the second pair of rollers
5 Upper pair of rollers
6 Lower pair of rollers Lower pair of rollers
7 Scrapers (optional)
8 Tilting device
9 Control devices
10 Devices for adjusting the gap between the rollers
Figure 2 — Double non-parallel pairs of rollers machine
prEN 18143:2024 (E)
Key
1 Lump inlet of the upper pair of rollers
2 Outlet of the flattened lump from the first pair of rollers
3 Flattened lump inlet of the lower pair of rollers
4 Outlet of the flattened dough from the second pair of rollers
5 Upper pair of rollers
6 Lower pair of rollers Lower pair of rollers
7 Scrapers (optional)
8 Tilting device
9 Control devices
Figure 3 — Parallel double pairs of rollers machine
3.2.2 Description of the process
The flow of the process for a normal duty cycle is shown in:
a) Figure 4, for a machine with parallel double pairs of rollers;
b) Figure 5, for a machine with non-parallel double pairs of rollers;
c) Figure 6, for a machine with a single pair of rollers;
and represents the state of the art on how the machine is used.
prEN 18143:2024 (E)
Key
1 Introduction of the lump (by gravity)
2 First processing of the dough – flattening and raw shaping
3 Moving toward the second pair of rollers (by gravity, through the second feed chute)
4 Second processing of the dough – further flattening and shaping
5 Discharge of the processed dough and laying down of it on the table
Figure 4 — Processing flow in a machine with parallel double pairs of rollers
prEN 18143:2024 (E)
Key
1 Introduction of the lump (by gravity)
2 First processing of the dough – flattening and raw shaping
3 Rotation of flattened lump by means of the tilting device and moving toward the second pair of rollers (by
gravity)
4 Second processing of the dough – further flattening and shaping
5 Discharge of the processed dough and laying down of it on the table
Figure 5 — Processing flow in a machine with non-parallel double pairs of rollers
prEN 18143:2024 (E)
Key
1 Introduction of the lump (by gravity)
2 First processing of the dough – flattening and raw shaping
3 Discharge of the processed dough and laying down of it on the table
Figure 6 — Processing flow for the single pair of rollers
Examples of positioning of the pizza dough sheeters are given in informative Annex B.
4 Safety requirements and/or protective/risk reduction measures
4.1 General
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 ISO 12100:2010 for relevant
but not significant hazards, which are not dealt with by this document.
4.2 Mechanical hazards
4.2.1 General requirements for rollers
If the rollers are grooved, the following requirements shall be met (see Figure 7):
— the grooves shall be circumferential or helicoidal; and the perpendicular axle passing through their
centers shall coincide with the axis of the roller;
— the distance (P) between two consecutive grooves along the same generatrix of the roller shall
be ≤ 2 mm;
— the depth of the grooves (G) shall be ≤ 0,4 mm.
prEN 18143:2024 (E)
Key
P Distance between two consecutive grooves
G Depth of the groove
Figure 7 — Grooves description
4.2.2 Zone 1 – Hazard of drawing-in and crushing between the counterrotating feed intake for
upper pair of rollers (machines with two pairs of rollers) or pair of rollers (machines with a
single pair of rollers)
4.2.2.1 General
Access to the hazard zone (gap between the rollers) shall be prevented or restricted with at least one of
the following:
— a fixed distance guard (see 4.2.2.2);
— an interlocking movable guard (see 4.2.2.3). i.e. in case of frequent opening or removal of the guard
which does not require the use of tools for being removed (e.g. for cleaning reasons and for
reassembling it);
— a hopper or a feed chute with a tripping device (e.g. a pressure-sensitive bar) at the top (see 4.2.2.4).
4.2.2.2 Fixed distance guard
The fixed distance guard shall comply with the following requirements:
— The gap between the rollers shall be ≤ 4 mm;
— The opening at the upper side of the fixed distance guard for the lump inlet shall comply with Table 1
(see also Figure 8).
Table 1 — Dimensions for the lump inlet opening
A ≤ 50 mm
B ≥ 150 mm
The fixed distance guard shall comply with EN ISO 14120:2015, 5.2.4, 5.3.7, 5.3.9 and 5.3.10.
prEN 18143:2024 (E)
If the fixed distance guard has openings other than the dough inlet and outlet ones, they shall comply
with EN ISO 13857:2019, Table 3, Table 4 and Table 6.
If the guard is not permanently fixed, e.g. by welding, its fixing systems shall remain attached to the guard
or to the machinery when the guard is removed.
The manufacturer shall provide information that the machine shall be placed so that the vertical distance
between the floor and the infeed opening upper rim (the upper one in case of two pairs of rollers
machine) shall be ≤ 1650 mm (see 6.3 t)) according to 4.4.
The manufacturer shall provide information about the vertical distance between the upper rim of the
inlet opening and the lower side of the machine (see 6.3 s)).
Key
1 Rollers
2 Fixed distance guard
3 Opening for the lump inlet
4 Reference plane for measuring distance (B)
A Inlet opening maximum width
E Localization of the reference plane (4) where distance from one roller to the other is equal to 25 mm
B Shortest distance between the outer edge of the opening and the reference plane (4)
Figure 8 — Dimensions of lump inlet opening
4.2.2.3 Interlocking movable guard
All following requirements shall apply:
— the opening at the upper side of the guard for the lump inlet shall comply with Table 1 (see also
Figure 8);
— moving the interlocking guard from its normal resting position shall activate the stop of every part
of the machine when the clearance between the guard and other parts of the machine exceeds
10 mm;
prEN 18143:2024 (E)
— the inlet opening width A (see Figure 8) at the upper side of the guard shall not increase when the
interlocking guard is moved from its normal resting position;
— the stopping time after activation of the interlocking device shall be ≤ 1 s;
— the safety related parts of the control system and the combination of these parts which performs the
safety function shall meet at least a performance level “c” specified in accordance with
EN ISO 13849-1:2023;
— the interlocking guard shall comply with EN ISO 14119:2013, Clauses 5 and 6, and
EN ISO 14120:2015, 5.2.4, 5.3.7, 5.3.12 and 5.3.13;
— if the interlocking guard has openings other than the dough inlet and outlet ones, they shall comply
with EN ISO 13857:2019, Table 3, Table 4 and Table 6;
The manufacturer shall provide information that the machine shall be placed so that the vertical distance
between the floor and the infeed opening upper rim (the upper one in case of two pairs of rollers
machine) shall be ≤ 1650 mm (see 6.3 t)) according to 4.4.
The manufacturer shall provide information about the vertical distance between the upper rim of the
inlet opening and the lower side of the machine (see 6.3 s)).
4.2.2.4 Feed hopper with a pressure-sensitive bar at the top of the hopper
If a pressure-sensitive bar is used as a safeguarding measure to stop the hazardous movements, all
following requirements shall apply:
— the pressure sensitive bar shall comply with EN ISO 13856-2:2013;
— the inlet opening shall comply with Table 2 (see also Figure 9);
— the pressure-sensitive bar shall be attached to the upper rim of the chute or to a provided supporting
system;
— the clearance (C) between the sensitive bar and the rim of the hopper shall be ≤ 20 mm (see
Figure 9);
— the pressure-sensitive bar shall control the stop of every moving part of the machine when it has
moved for a linear displacement D ≤ 15 mm from its resting position (see Figure 9);
— in horizontal projection the pressure-sensitive bar shall run parallel at least to the lateral and the
front sides of the inlet opening and outside it;
— the stopping time after activation of the pressure-sensitive bar shall be ≤ 1 s;
— the safety-related parts of the control system and the combination of these parts which performs the
safety function shall meet at least a performance level “c” specified in accordance with
EN ISO 13849-1:2023.
The manufacturer shall provide information that the machine shall be placed so that the vertical distance
between the floor and the upper side of the pressure sensitive bar is ≤ 1650 mm (see 6.3 v)) according to
4.4.
The manufacturer shall provide information about the vertical distance between the upper rim of the
tripping device and the lower side of the machine (see 6.3 u)).
prEN 18143:2024 (E)
Table 2 — Dimensions for the lump inlet opening with tripping device
A ≤ 50 mm
B ≥ 120 mm
C ≤ 20 mm
D ≤ 15 mm
Key
1 Rollers
2 Pressure-sensitive bar
3 Opening for the lump inlet
4 Reference plane for measuring distance (B)
A Inlet opening maximum width
E Localization of the reference plane (4) where distance from one roller to the other is equal to 25 mm
B Shortest distance between the outer edge of the opening and the reference plane (4)
C Linear displacement of the sensitive bar when the safety device actuates
D Clearance between the sensitive bar and the rim of the hopper
Figure 9 — Inlet opening with pressure-sensitive bar
prEN 18143:2024 (E)
4.2.3 Zone 2 – Hazard of drawing-in between a rotating roller and other parts
4.2.3.1 General
The access to hazards of drawing-in zones from the outlet side of:
— the roller pair (single pair of rollers machines);
— both roller pairs (two pairs of rollers machines);
shall be prevented or restricted with:
— a fixed distance guard (see 4.2.3.2), which shall comply with the requirements in 4.2.3.2; or
— an interlocking movable or removable guard (see 4.2.3.3).
4.2.3.2 Fixed distance guard
All following requirements shall apply:
— if the guard is not permanently fixed, e.g. by welding, its fixing systems shall remain attached to the
guard or to the machinery when the guard is removed;
— at least one side of the fixed distance guard shall be parallel to the axis of the relevant roller, and it
shall be located at a distance A ≤ 4 mm from the nearest generatrix of the relevant roller (see
Figure 10);
— any other clearance B (see example in Figure 10) between the fixed distance guard and other parts
of the machine, which allow the access to the hazard zone, shall comply with EN ISO 13857:2019,
Table 3, Table 4 and Table 6 (see Figure 10):
— the fixed distance guards shall comply with EN ISO 14120:2015, 5.2.4, 5.3.7, 5.3.9 and 5.3.10; if the
fixed distance guard has openings other than the dough outlet and inlet ones, they shall comply with
EN ISO 13857:2019, Table 3, Table 4 and Table 6.
In the Figure 10, some examples of fixed distance guards, e.g. ramp and other fixed sheet (see
Figure 10 a)) or spacing bars (see Figure 10 b)), for preventing/restricting the access to the hazard zones
are shown.
prEN 18143:2024 (E)
a) Ramp and other fixed sheet b) Spacing bars
Key
A Clearance between the fixed distance guard and the nearest generatrix of the roller
B Example of clearance B between the fixed distance guard and other parts of the machine
1 Rollers
2 Ramp
3 Fixed sheet
4 Spacing bar
Figure 10 — Examples of fixed distance guards to prevent/restrict the access to hazard zone 2
4.2.3.3 Interlocking movable guard
If the guard is fixed to the machine with m
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