US2992521A - Polishing glass - Google Patents

Polishing glass Download PDF

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Publication number
US2992521A
US2992521A US31595A US3159560A US2992521A US 2992521 A US2992521 A US 2992521A US 31595 A US31595 A US 31595A US 3159560 A US3159560 A US 3159560A US 2992521 A US2992521 A US 2992521A
Authority
US
United States
Prior art keywords
polishing
glass
sheets
runners
broken
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US31595A
Other languages
English (en)
Inventor
Earl H Glasgow
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PPG Industries Inc
Original Assignee
Pittsburgh Plate Glass Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pittsburgh Plate Glass Co filed Critical Pittsburgh Plate Glass Co
Priority to US31595A priority Critical patent/US2992521A/en
Priority to GB17198/61A priority patent/GB909819A/en
Priority to BE604190A priority patent/BE604190A/fr
Application granted granted Critical
Publication of US2992521A publication Critical patent/US2992521A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
    • B24B7/20—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground
    • B24B7/22—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground for grinding inorganic material, e.g. stone, ceramics, porcelain
    • B24B7/24—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground for grinding inorganic material, e.g. stone, ceramics, porcelain for grinding or polishing glass

Definitions

  • This invention relates to a method for polishing plate glass, and particularly to the method in which plates of glass are conveyed on cars, tables or other carrier apparatus beneath a series of polishing runners wherein successive major surfaces are polished, one at a time.
  • the usual procedure is to embed discrete rough rolled glass sheets in plaster of Paris on tables or lay the sheets on cloth covered tables which are then joined together and conveyed in a continuous fashion through grinding apparatus wherein the upper major surface is ground by a slurry of sand and water, producing what is known as a smooth, and then through polishing apparatus wherein the smooth is surfaced by a rouge and copper as water slurry.
  • grinding apparatus wherein the upper major surface is ground by a slurry of sand and water, producing what is known as a smooth, and then through polishing apparatus wherein the smooth is surfaced by a rouge and copper as water slurry.
  • glass sheets become broken while on the tables, especially while passing through the grinding apparatus and before being presented to the polishing apparatus. Because the tables are connected together for the entire surfacing operation and due to time limitations, the tables with the broken sheets cannot be removed from the line so that the broken sheet is conveyed through the polishing apparatus.
  • the primary object of this invention is to provide a method of treating breaks in glass plates prior to presentation to polishing apparatus for surfacing, so as to eliminate damage to the surfacing equipment and increase the yield of the product.
  • FIG. 1 represents successive glass plates as they continuously are conveyed through polishing apparatus with a break indicated therein and the results obtained when following the conventional procedure;
  • FIG. Z represents successive glass plates as they continuously are conveyed through polishing apparatus with a break indicated therein repaired in accordance with the teachings of this invention and the results thus obtained.
  • FIG. 1 we see a series of glass plates or sheets 1, 2, 3, 4 and 5 advancing through polishing apparatus in the direction indicated by legend and arrow.
  • the polishing apparatus as for example those with feltfaced runners, or the glass plate supporting tables and conveying means are not illustrated because they are conventional in construction and well known in the art.
  • a break, identified as 10 is indicated in sheet 3. Breaks of this nature are generally irregular and occur at random in a plate, so that the break indicated is only for purposes of illustration and description.
  • a portion of leading plate 4 after passing through the polishers has a normal finish, but a portion has a poor finish because the polishing runners must be raised from polishing contact before the broken plate passes thereunder.
  • plate 4- may be perfect in dimensions, only the portion with the normal finish is saleable, the remaining portion being unsalcable and relegated to cullet. Plate 3, with the break, is completely unsaleable, and trailing plate 2 will be only partially polished because the polishing runners must be lowered into polishing contact after plate 3 with the break passes thereunder. As will be readily understood, a large quantity of finished product is thereby lost.
  • FIG. 2 shows a like series of glass sheets or plates 1A, 2A, 3A, 4A, and 5A being conveyed through the polishing apparatus in. the direction indicated by legend and arrow.
  • the polishing apparatus and supporting and conveying tables are not illustrated because they are conventional and well known in the art.
  • the break 11 is shown in broken lines and is masked by relatively thin strip material 12, such as pressure sensitive tape.
  • strip material 12 such as pressure sensitive tape.
  • strip material 12 such as pressure sensitive tape.
  • more than one layer of strip material tape may be used as when there are multiple breaks closely adjacent one another because overlaps do not affect the operation. Excellent results have been obtained with an aluminum pressure sensitive tape 2 inches wide and on the order of 0.005 inch thick. This tape adheres to the glass plate without necessity for a glass surface cleaning treatment. Application is made by hand or other manually operated applicator means between the grinding apparatus and the polishing apparatus.
  • This procedure results in a more continuous polishing process because of no interruption or" the polishing process, a savings in repair and/ or replacement of polishing surfaces because glass chips are not exposed to polishing surfaces and do not become embedded therein, so as to damage other glass sheets, and a greateryield of saleable product because more glass is completely polished.
  • strip material is a pressure sensitive tape.
  • strip material is a pressure sensitive metal tape.
  • a method for polishing a glass sheet having breaks therein wherein a polishing runner having a felt polishing face which rubs a surface of said glass and is subject to damage by contact with said breaks, the improvement which comprises masking said breaks from contact with said polishing felt and contacting said surface of said glass with said polishing felt while maintaining a predetermined vertical relationship of said polishing felt and said glass and thereby avoiding damage to said felt.
  • masking said breaks comprises adhering a pressure sensitive tape to said glass over said breaks.
  • a method for polishing glass sheets subject to breaks therein wherein a plurality of polishing runners having felt polishing faces which rub a surface of said glass and are subject to damage by contact with said breaks, the improvement which comprises masking said breaks from contact with said polishing felts and contacting said surface of said glass with said felts while maintaining a predetermined vertical relationship of said felt and said glass thereby avoiding damage to said felts.
  • masking said breaks comprises adhering a pressure sensitive metal tape to said glass completely covering said breaks.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
US31595A 1960-05-25 1960-05-25 Polishing glass Expired - Lifetime US2992521A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US31595A US2992521A (en) 1960-05-25 1960-05-25 Polishing glass
GB17198/61A GB909819A (en) 1960-05-25 1961-05-11 Method for polishing glass sheets
BE604190A BE604190A (fr) 1960-05-25 1961-05-25 Procédé de polissage de plaques de verre

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US31595A US2992521A (en) 1960-05-25 1960-05-25 Polishing glass

Publications (1)

Publication Number Publication Date
US2992521A true US2992521A (en) 1961-07-18

Family

ID=21860360

Family Applications (1)

Application Number Title Priority Date Filing Date
US31595A Expired - Lifetime US2992521A (en) 1960-05-25 1960-05-25 Polishing glass

Country Status (3)

Country Link
US (1) US2992521A (fr)
BE (1) BE604190A (fr)
GB (1) GB909819A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3247626A (en) * 1963-04-30 1966-04-26 Pittsburgh Plate Glass Co Glass planing process

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3247626A (en) * 1963-04-30 1966-04-26 Pittsburgh Plate Glass Co Glass planing process

Also Published As

Publication number Publication date
BE604190A (fr) 1961-11-27
GB909819A (en) 1962-11-07

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