Published by CEN: 2008
Published by BSI: 2008
Reviewed: Due for first review 2013
Amended: A1 - 2009 to include Annex ZB which confirms that this Standard gives a presumption of conformity to the new Machinery Directive 2006/42/EC as well as 98/37/EC.
Clause 3 gives a name and description for each of the machines considered in the Standard and illustrates their method of operation with isometric drawings.
Clause 3 also defines the typical terminology used when discussing these machines like compression strapping, strap accumulator and strap arch.
Clause 4 of the Standard identifies the injuries that can be caused by each type of strapping machine. The injuries most often caused by strapping machines are:
Clause 18.104.22.168 establishes the principle that if the strap tension is less than 450 N there is no risk of crushing if the strap is tensioned over the operator’s hands or other body parts. If the strap tension is between 450 N and 750 N the Standard requires the use of two independent product detecting devices so that the operator cannot accidentally initiate a strapping operation or the use of two hand controls.
Where the strap tension is over 750N fixed or interlocking guards or safety protection devices are required to ensure that he operator cannot reach the strap arch during the strapping cycle.
Clause 22.214.171.124 and 126.96.36.199 establish the principle that strap dispensing and feeding mechanisms can be made safe by design and provide suggestions for how this can be achieved.
Clauses 188.8.131.52 to 184.108.40.206 indicate that these mechanisms will typically be protected using fixed or interlocking guards.
Clause 220.127.116.11 explains how the different types of sealing mechanism can be safeguarded. Special requirements apply for machines handling plastic strap where there may be a risk of burning from either heating devices or the hot strap and where polyester strap is used the risk of generating fumes which are hazardous to health.
The requirements for compression mechanisms depend on the type of machine. Clause 5.4.5 indicates how compression devices can be made safe by design on semi-automatic strapping machines and Clause 5.5.6 indicates safety by design requirements for compression forces under 250 N and guards and safety protection devices where the force is greater than 250 N.
The infeed and discharge apertures on guarded strapping machines can be big enough for a person to crawl through and in the case of pallet strapping machines walk through.
Clause 18.104.22.168.4.2 describes measures for safeguarding medium sized apertures and Annex C describes several methods of safeguarding large apertures.
Strapping machines are now being manufactured in a large number of countries and the market for these machines is now very competitive. At present it is evident that some machines are less safe than others and so it is to be hoped that this Standard will encourage all manufacturers to make machines with equivalent standards of safety.
EN 415-8 can be purchased as BS EN 415-8: 2008 + A1: 2009 from BSI Standards.