Topic: Query for Adam D (glass-forming)

[Sklounion]

Hi Adam,
I have come across the term "sacofoukanim", which as best as I can translate from the Czech, refers to a "vacuum and blow" process for forming glass.
Please could you be so kind as to elaborate on how exactly this would have been carried out? I have been trying to figure whether the vacuum stage is related to glass-feed, or integral with the forming part of the operation.
Thanks in advance,
Regards,
Marcus

[Frank]

http://www.ysartglass.com/Moncrieff/Patent/Patuk320034.htm

The machine is preferably of the suction-gathering type, the charge of glass being drawn into the parison mould in the dipping position by a vacuum created in the blow head of the parison mould, the blow head being connected to suction and pressure pipes controlled by automatically-actuated valves. As soon as the charge of glass has been drawn in, the vacuum valve closes and the parison mould travels from the gathering position to the transfer position, where the parison mould opens and the parison is transferred to the finishing mould.

[Sklounion]

Thanks, Frank,
Cannot get much clearer an explanation.....
Regards,
Marcus

[Ivo]

this might help
http://www.glassonline.com/infoserv/dictionary/614.html
or not...

[Patrick]

hi, The link to Glassonline mentions " Illustrated Glass Dictionary "
      Where are the ILLUSTRATIONS    ?
                PATRICK.

[Adam]

I would only add that, so far as I am aware, suck-blow was mainly a bottle-making system.  The Grand Old Man of bottle machines, the Owens, was of this type.  The Owens appeared very early in the 20th century and was reputed (can't confirm this) to be the first fully automatic machine for making anything.  I was privileged to see probably the last of these monsters in the UK working at CWS, Worksop around 1947.  Owens, and possibly other suck-blow bottles were identifiable by a horrendous shear mark on the bottom.

Adam D.

[Frank]

Owens, and possibly other suck-blow bottles were identifiable by a horrendous shear mark on the bottom.

Interesting, I would like to see an example of such a bottom. Anyone?

Owens and similar machines lasted out a bit longer in other parts of the world.

[Sid]

Frank:

Here is a picture:  http://www.blm.gov/historic_bottles/suctionscar.jpg

This comes from a wonderful website that covers many aspects of hand made and machine made bottles:

http://www.blm.gov/historic_bottles/

[Sklounion]

Sid,

Thanks for these links. The main page of the BLM site shows that OI machines must have changed between 1929 and 1941, as the base of a 1941 bottle does not carry that shear mark. That would explain in part, why decorative glass could be made using this process.

I can see light at the end of this particular tunnel now.

Thanks to all of you, for your contributions.

Regards,

Marcus