Classifications

• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
  • C03B9/00—Blowing glass; Production of hollow glass articles
  • C03B9/30—Details of blowing glass; Use of materials for the moulds
  • C03B9/38—Means for cooling, heating, or insulating glass-blowing machines or for cooling the glass moulded by the machine
  • C03B9/3825—Details thereof relating to plungers
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
  • C03B40/00—Preventing adhesion between glass and glass or between glass and the means used to shape it, hold it or support it
  • C03B40/04—Preventing adhesion between glass and glass or between glass and the means used to shape it, hold it or support it using gas
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
  • C03B9/00—Blowing glass; Production of hollow glass articles
  • C03B9/13—Blowing glass; Production of hollow glass articles in gob feeder machines
  • C03B9/193—Blowing glass; Production of hollow glass articles in gob feeder machines in "press-and-blow" machines
  • C03B9/1932—Details of such machines, e.g. plungers or plunger mechanisms for the press-and-blow machine, cooling of plungers

Definitions

• the invention relates to a device for pressing hollow moldings made of glass between a mold which has an inner wall which is complementary to the outside of a molding and a neck ring for forming a mouth of the molding, and a plunger which has a supporting body and an open-pore plunger head attached thereto with a Has inside of the molding complementary surface and an inner cavity which can be filled with a liquid, a portion of which evaporates by heat transfer from the glass to the plunger head during each working cycle, forms a separating vapor layer between the surface and the glass and through further liquid introduced into the plunger head is replaced.
• the plunger including a neck region enclosed by the neck ring, is open-pored, the plunger tip having an increased porosity.
• a normal porosity in the neck area is sufficient, however, to bring about a rapid cooling of the molding in connection with the neck ring, cracks and / or water marks being able to arise in its mouth area.
• the supporting body of the plunger is arranged completely radially inside the neck ring; the open-pore plunger head only begins in a plane normal to the geometric axis of the plunger axially outside the neck ring.
• the vapor layer that forms between the plunger head and the glass can therefore not reach the mouth area of the resulting molding.
• the formation on the inside of its mouth is directly touched by the solid support body. Therefore, the mouth of the molded body is rapidly cooled by the support body, which has a high heat penetration number, can adhere to it and, as a result, be injured when the plunger is pulled out and become contaminated by abrasion of the plunger.
• the invention is therefore based on the object. Avoid cracks and water marks on the glass surface in the mouth area more reliably than before.
• the object is achieved according to the invention in a device of the type described at the outset in that the open-pore plunger head, which is adjacent to the support body, is designed to form the mouth of the molding. deten and enclosed by the neck ring of the form a liquid-impermeable lining.
• the invention is based on the knowledge that the described adverse phenomena occurring in known generic devices can be avoided by reducing the liquid inflow in the neck area of the plunger in such a way that the surface temperature of the glass in the mouth area does not decrease much more rapidly than in the other areas of the molding. This is done in that the neck region of the plunger head is supplied with liquid exclusively from the part of the plunger head arranged axially outside the liquid-leaking lining, so that the liquid supply to the neck region is less than it would be in the absence of this lining.
• the lining is a sleeve which extends into the support body.
• the sleeve contributes to the secure mechanical fastening of the open-pore plunger head to the plunger support body.
• the sleeve is attached to an inner tube which extends axially through the support body into the plunger head and is sealed against the inner wall of the sleeve.
• the device shown is used for pressing hollow shaped articles 10 made of glass, which are then blown to beer bottles or the like. to be processed further.
• a molding 10 is partially shown in the drawing.
• the device has a hollow shape 12 with an inner wall 14 which is complementary to the outside of the molded article 10, a support ring 16 and a two-part neck ring 18 for forming an opening 20 of the molded article 10.
• a plunger 22 is associated with the mold 12 and has a support body 24 and a plunger head 26 attached to it.
• the plunger head 26 consists of open-pore sintered metal and has a surface 28 which is complementary to the inside of the molded article 10 and an inner cavity 30 and is fastened, for example welded, to the support body 24.
• the drawing shows the mold 12 in the closed state and the plunger 22 in an end position which it has reached by immersing it in the mold 12, into which a glass drop has previously been introduced.
• the neck ring 18 encloses a neck region 32 of the plunger head 26.
• the neck region 32 is lined with a water-impermeable sleeve 34 which extends into the supporting body 24 and is fastened therein.
• the plunger 22 also includes an inner tube 36 which extends axially through the support body 24 and into the plunger head 26 and is sealed with an annular seal 38 against the inner wall of the sleeve 34 within the support body 24.
• a piston-cylinder unit is provided in the usual way, of which only one end of a hollow piston rod 40 is shown.
• the support body 24 is attached to the piston rod 40 and sealed against it with a further ring seal 42.
• the plunger 22 is supplied with water from the hollow piston rod 40 through the inner tube 36, which fills the cavity 30 of the plunger head 26 and the pores in the wall of the plunger head 26 and evaporates in the pores, so that there is between the surface 28 and the glass from which the molding 10 is formed, forms a vapor layer.
• This also applies to the neck area 32 of the plunger head 26, which, however, because of the water-impermeable sleeve 34, is supplied with water only by an annular cross-sectional area 44 of the plunger head 26 delimiting the neck area 32.
• the molding 10 is also kept separate from the plunger 22 in the region of its mouth 20 by a vapor layer. In this way it is avoided that the molded article 10 cools too suddenly in the region of its mouth 20.
• the sleeve 34 can be perforated or slotted in the areas in which a stronger steam formation is to be brought about, without the plunger 22 or the Form 12 needs to be changed otherwise.
• the sleeve 34 need only be provided in the neck area 32 of the plunger head 26; however, the extension of the sleeve 34 into the support body 24 is generally advantageous for reasons of strength.
• the sleeve 34 can be omitted entirely if a material, preferably sintered metal, is used to produce the neck region 32, which is open-pored but has a lower porosity than the material used to produce the rest of the plunger head 26.

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Organic Chemistry (AREA)
• Manufacturing & Machinery (AREA)
• Containers Having Bodies Formed In One Piece (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6413558

Family Applications (1)

Country Status (3)

Families Citing this family (1)

Citations (3)

• 1990
  • 1990-09-04 DE DE19904028005 patent/DE4028005C1/de not_active Expired - Fee Related
• 1991
  • 1991-09-03 AU AU84034/91A patent/AU8403491A/en not_active Abandoned
  • 1991-09-03 WO PCT/EP1991/001666 patent/WO1992004287A1/de unknown

Patent Citations (3)

Also Published As

Similar Documents

Legal Events