This draft European standard specifies safety requirements relating to the design and construction of calenders intended for the processing of rubber or plastics. This draft European standard concerns the calender alone, including all components fixed to its frame. Annex C shows examples of various types of calenders and Annex D shows examples of calendaring processes. This draft European standard deals with all significant hazards, hazardous situations or hazardous events relevant to the design and construction of calenders, when the machines are used as intended and under the conditions of misuse which are reasonably foreseeable by the manufacturer (see Annex B). This draft European standard does not deal with: hazards generated by the processing of explosive materials, or materials which give rise to an explosive atmosphere; hazards due to laser or ionizing radiation; hazards generated if the calender is installed in an explosive atmosphere. Two roll mills are covered by EN 1417. This draft European standard applies to machinery manufactured after its date of approval by CEN.