External internal channels in glass tubing

Details External internal channels in glass tubing External internal channels in glass tubing

1974-04-05

1976-04-20

Aegerter, Richard E.

Pipes and tubular conduits

Miscellaneous

138103, 138111, 165156, 202185D, 202185E, F16L 910

Patent

active

039511758

ABSTRACT:
A method for forming integral internal channels defined by a wall with an annular cross-section inside high softening temperature glass tubing is described. In particular, a reduced pressure is provided inside a rotating tube with heating outside which softens the glass for deformation by the reduced pressure while a smaller tube is maintained in position in contact with the inside walls of the larger tube. The pressure in the smaller tube is usually the same as that in the larger tube and is such that it can collapse at the point of contact to form at least one fusion band along the inside wall of the larger tube. The position of the smaller tube is maintained such that the larger tube has concave depressions between the fusion bands. Usually the heating is accomplished by a gas flame ring burner positioned under the larger tube and moved progressively along the larger tube until the desired fusion of the tubes is completed. The next step which is preferred is to provide a positive pressure in the larger tube with heating to soften the glass to move the concave depressions out and mold them against a platen provided in spaced relation to the depressions outside of the larger tube. This can also be progressively accomplished with the ring burner. While the glass tubes are being manipulated, the sections being fused and molded are maintained above the strain point temperature of the glass. The glass is then usually annealed and then it is cooled. The articles produced are strain free, compact, durable and particularly useful for heat transfer applications such as reflux, still-head and take-off condensers used in conducting chemical reactions and liquid distillation operations. Preferably the channels form a helical coil inside the tube. In addition an electrical resistance wire can be provided in the channels to produce reaction vessels suitable for heating liquids and for conducting chemical reactions.

REFERENCES:
patent: 1881718 (1932-10-01), Lawrie
patent: 2324257 (1943-07-01), Ekert
patent: 2425669 (1947-08-01), Brock
patent: 3296817 (1967-01-01), Stoelting
patent: 3536462 (1970-10-01), Eyster et al.
patent: 3696003 (1972-10-01), Fitch et al.
corning Glass works, Corning N.Y., Laboratory Glassware, Lab-1, 1967-1968, Suppl. 5, pp. 0,2,255 and 266.
Corning Glass Works, Custom Made Condensers, Laboratory Glassware Sales Department, copyright 1960, pp. 189, 193 and 288.

Affiliated with

Also associated with

Rating

External internal channels in glass tubing does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with External internal channels in glass tubing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and External internal channels in glass tubing will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1579712