CEN/TC 145/WG 3 - Extruders and extrusion lines - Safety

This document deals with all significant hazards, hazardous situations and events relevant to haul-offs for cable, cable core, profiles and pipes for processing plastic and rubber, when they are used as intended and under conditions of misuse which are reasonably foreseeable by the manufacturer (see Annex A). The hazards have been identified taking into account all phases of the machine life cycle according to EN ISO 12100:2010, 5.4.
The following kinds of haul-offs are covered:
-   caterpillar haul-offs;
-   belt haul-offs;
-   capstan haul-offs;
-   belt capstan haul-offs;
-   roller haul-offs.
The haul-off can function independently and begins at the product inlet opening and ends at the product outlet.
Cutting units which are integrated with or attached to the haul-off are not covered.
Take-off devices used on film or sheet lines are not covered.
This document is not applicable to haul-offs that are manufactured before the date of its publication.

This European Standard specifies all significant hazards, hazardous situations and events relevant to all types of screw extruders for plastics and rubber, when they are used as intended and under conditions of misuse which are foreseeable by the manufacturer (see Clause 4).
This European Standard additionally covers the following feeding systems:
- hoppers;
- single roller feed;
- double roller feed;
- crammer feeder;
and the following ancillary equipment which form part of or are attached to the extruder:
- screen changers;
- melt/gear pumps;
- melt pipes and adaptors;
- static mixers;
- extruder head that give initial shape to the extruded material.
NOTE   Metering devices are not covered by this standard.
This European Standard does not deal with hazards caused by the processing of materials and which may lead to a risk of fire or release of health hazardous materials.
An extruder conforming to this document is not regarded as a pressure vessel as defined in the Pressure Equipment Directive 97/23/EC.
Extruders usually do not produce explosive atmospheres. Where materials are processed, which may cause an explosive atmosphere, the Directive 94/9/EC on the Equipment intended for use in Potentially Explosive Atmospheres (ATEX) should be applied. Explosion hazards are not dealt with in this document.
This European Standard is not applicable to extruders which are manufactured before the date of its publication as EN.

This European Standard contains the safety requirements for the design and construction of haul-offs used in extrusion lines for processing plastics and rubber for the hazards identified in clause 4. The following kinds of haul-offs are covered:
-   caterpillar haul-offs;
-   belt haul-offs;
-   capstan haul-offs;
-   belt capstan haul-offs;
-   roller haul-offs.
The machine begins at the material inlet opening and ends at the material outlet.
Cutting units which are integrated with or attached to the haul-off are not covered.
Take-off devices used at film or sheet lines are not covered.
Chemical, toxicological and fire hazards which could occur for example in continuous vulcanisation plants due to the materials processed are not dealt with.
Unwinding and winding machines are not subject to this standard. They are being dealt with in a separate standard being produced by another working group of CEN/TC 145.
This document is not applicable to haul-offs which are manufactured before the date of publication by CEN of this document.

In respect of the hazards listed in 4.1 and dealt with in 5, this standard specifies the safety requirements for the design and construction of the following kinds of screw type extruders for plastics and rubber:   - single screw extruders - twin screw extruders - multi/multiple screw extruders - hot feed extruders - cold feed extruders - vacuum extruders - pin extruders  The standard additionally covers the following feeding systems:  - hoppers - single roller feeding systems - double roller feeding systems - crammer feeding systems  and the following ancillary equipment which form part of or are attached to the extruder:  - screen changers - melt/gear pumps - melt ducts - static mixers - degassing equipment - shear head devices - extruder head  This standard only applies to extruder heads that give initial shape to the plasticised material.  This standards does not apply to extruders without screws e.g.:  - piston extruders - disc extruders - roller extruders  This standard applies primarily to machines which are manufactured after the date of approval of this European Standard.

This European Standard specifies safety requirements for the design and construction, in respect of the hazards listed in clause 4 and dealt with in clause 5, of the following kinds of die face pelletisers used with extruders for pelletising of plastics and rubber:
-   Underwater pelletisers;
-   Water ring pelletisers;
-   Dry pelletisers;
-   Centrifugal pelletisers;
-   Knife rotor pelletisers.
Strand pelletisers are not subject to this standard. They are dealt with in a separate standard being produced by CEN/TC 145/WG6.
This standard does not cover requirements for the design of any exhaust system.
This standard applies to machines which are manufactured after the date of publication by CEN of the standard

In respect of the hazards listed in clause 4 and dealt with in clause 5, this European Standard contains safety requirements for the design and construction of the following kinds of haul-offs used in extrusion lines for processing plastics and rubber: - caterpillar haul-offs, - belt haul-offs, - capstan haul- offs, - belt capstan haul-offs, - roller haul-offs. The machine begins at the material inlet opening and ends at the material outlet.

This European Standard specifies safety  requirements for the design and construction, in respect of the hazards listed in clause 4 and dealt with in clause 5, of the following kinds of die face pelletisers used with extruders for pelletising of plastics and rubber:  - underwater pelletisers; - water ring pelletisers; - dry pelletisers; - centrifugal pelletisers; - knife rotor pelletisers.  Strand pelletisers are not subject to this standard. They are dealt with in a separate standard being produced by CEN/TC 145/WG6.  This standard does not cover requirements for the design of any exhaust system.   This standard applies to machines which are manufactured after the date of publication by CEN of the standard.