Classifications

• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
  • C03B23/00—Re-forming shaped glass
  • C03B23/02—Re-forming glass sheets
  • C03B23/023—Re-forming glass sheets by bending
  • C03B23/035—Re-forming glass sheets by bending using a gas cushion or by changing gas pressure, e.g. by applying vacuum or blowing for supporting the glass while bending
  • C03B23/0352—Re-forming glass sheets by bending using a gas cushion or by changing gas pressure, e.g. by applying vacuum or blowing for supporting the glass while bending by suction or blowing out for providing the deformation force to bend the glass sheet
  • C03B23/0357—Re-forming glass sheets by bending using a gas cushion or by changing gas pressure, e.g. by applying vacuum or blowing for supporting the glass while bending by suction or blowing out for providing the deformation force to bend the glass sheet by suction without blowing, e.g. with vacuum or by venturi effect
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
  • C03B23/00—Re-forming shaped glass
  • C03B23/02—Re-forming glass sheets
  • C03B23/023—Re-forming glass sheets by bending
  • C03B23/025—Re-forming glass sheets by bending by gravity
  • C03B23/0258—Gravity bending involving applying local or additional heating, cooling or insulating means
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
  • C03B23/00—Re-forming shaped glass
  • C03B23/02—Re-forming glass sheets
  • C03B23/023—Re-forming glass sheets by bending
  • C03B23/035—Re-forming glass sheets by bending using a gas cushion or by changing gas pressure, e.g. by applying vacuum or blowing for supporting the glass while bending
  • C03B23/0352—Re-forming glass sheets by bending using a gas cushion or by changing gas pressure, e.g. by applying vacuum or blowing for supporting the glass while bending by suction or blowing out for providing the deformation force to bend the glass sheet
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
  • C03B23/00—Re-forming shaped glass
  • C03B23/02—Re-forming glass sheets
  • C03B23/023—Re-forming glass sheets by bending
  • C03B23/035—Re-forming glass sheets by bending using a gas cushion or by changing gas pressure, e.g. by applying vacuum or blowing for supporting the glass while bending
  • C03B23/0352—Re-forming glass sheets by bending using a gas cushion or by changing gas pressure, e.g. by applying vacuum or blowing for supporting the glass while bending by suction or blowing out for providing the deformation force to bend the glass sheet
  • C03B23/0355—Re-forming glass sheets by bending using a gas cushion or by changing gas pressure, e.g. by applying vacuum or blowing for supporting the glass while bending by suction or blowing out for providing the deformation force to bend the glass sheet by blowing without suction directly on the glass sheet

Definitions

• the glass is sucked into a mold to accelerate the molding process.
• the wall thickness distribution is very unfavorable because cooling occurs at all points where the glass is supported during heating, which cannot be compensated for by the heating source.
• the greater the temperature difference between the glass and the mold the greater the cooling effect.
• the greater the degree of deformation desired the higher the glass must be heated.
• the adhesive temperature cannot be increased to the same extent.
• the greater the degree of deformation the greater the cooling effect. Difficult items such as a glass grate, can also not be produced with this quality with usable quality.
• the aim of the present invention is a method for deforming flat glass which avoids the disadvantages of conventional methods described. This goal is achieved with a method according to the claims.
• the plate to be deformed is placed on the mold in such a way that it only touches it at the edge, and the cavity enclosed by the glass and mold is largely sealed.
• an excess pressure is generated in the cavity, which prevents the glass from settling on protruding parts of the mold and cooling as the viscosity decreases.
• the glass can thus be brought to the low viscosity required for the shaping.
• the cavity is vented and evacuated. The atmospheric pressure brings the plastic glass into the desired shape.
• the thickness distribution is not affected by previous cooling; a high degree of deformation with a good thickness distribution is possible.
• the method can also be carried out in such a way that the softened glass plate carried by the gas cushion is blown and / or sucked into a shape arranged above it, in which the desired glass body is given its shape.
• FIG. 1 shows a section through an apparatus of the method with a flat glass pane during the heating thereof
• Figure 2 shows a section through the same device after lowering the softened disc.
• a flat glass plate 1 made of Duran 50 of 410 x 340 x 3 mm is placed on a mold 2 with a rectangular circumference which has been preheated to about 550 ° C.
• cover ring (pressure frame) 3 is placed on the disc and placed under a pressure of about 10 kp.
• burners 4 placed over the mold are ignited and the glass plate is heated to about 900 ° C.

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Organic Chemistry (AREA)
• Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6046585

Family Applications (1)

Country Status (5)

Cited By (1)

Families Citing this family (15)

Citations (7)

Family Cites Families (3)

• 1978
  • 1978-08-09 DE DE2834867A patent/DE2834867C2/de not_active Expired
• 1979
  • 1979-07-21 JP JP54501304A patent/JPS6111894B2/ja not_active Expired
  • 1979-07-21 WO PCT/DE1979/000076 patent/WO1980000336A1/de not_active Ceased
• 1980
  • 1980-03-11 EP EP79900974A patent/EP0016182B1/de not_active Expired
  • 1980-04-03 US US06/193,409 patent/US4313746A/en not_active Expired - Lifetime

Patent Citations (7)

Also Published As

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