Filter and associated filter web with sealed segments

Abstract From the Canadian patent

A filter apparatus for pressurized material in flowable form, such as molten synthetic resin in which an, elongated filter web which moves into and out of a filter chamber through respective sections of sealing channel has a plurality of seal members of thickness greater than the thickness of the filter web, sized for internal sealing engagement with imperforate walls of the channel sections. The lengths of the channel sections are greater than the spacing between successive seal members, ensuring throughout operation that at least one seal member is located in each channel section to seal the filter chamber from external space while enabling the filter, web to be stabilized. Preferred …