We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
GENERAL PRINCIPLES
31
DRYING TUNNEL
TO TAKE-DOWN MECHANISM
Fig. No. 5. — Lay-out of film coating apparatus.
that shown in Figure 5 is most easily visualised. It is assumed that the film has passed over roller 'D', and has been clamped in a stationary position at 'Ej' in the drying tunnel. Under these conditions the film between 'D' and 'E^ will, initially, follow the path indicated by 'Fj\ If the coating head is now set in motion the film between 'D' and 'E^ will gradually accumulate and form an ever lengthening loop as indicated at 'Fa', 'F3', *F4' and 'F5\ A chain passing between point 'L' and a position 'G' carries at one section an extension 'H' so arranged that it will come into contact with the lower roller of a waiting stock of rollers shown at T.
A roller is then picked up by the chain extension and, in passing upwards towards *L', carries the film with it as indicated at 'K^', 4K2', 'K3' and 'K4\ The speed of the chain between 'G' and 'L' is, of course, so arranged as to absorb the difference in speed between the rollers in the drying tunnel and those at the coating head. A transfer mechanism exists between the top of chain 'G-L' and the chain which carries rollers *E' along the drying tunnel, thereby automatically forming the coated film into a series of long loops. A similar mechanism, operating in reverse, exists at the dry end of the tunnel and makes it possible for the film to be again rolled up on a large core. All the rollers 'E' on the second chain are moved forward by similar extensions on the chain links to those which exist on the chain *G-L\
The film is then fed through a slitting machine which produces, from the wide roll of film, many rolls only 35-mm in width. The