GB474244A - Improvements in or relating to the production of plastic materials in sheet form - Google Patents

Improvements in or relating to the production of plastic materials in sheet form

Info

Publication number
GB474244A
GB474244A GB11995/36A GB1199536A GB474244A GB 474244 A GB474244 A GB 474244A GB 11995/36 A GB11995/36 A GB 11995/36A GB 1199536 A GB1199536 A GB 1199536A GB 474244 A GB474244 A GB 474244A
Authority
GB
United Kingdom
Prior art keywords
sheet
brine
baths
temperature
per cent
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
Application number
GB11995/36A
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.)
DuPont Viscoloid Co
Original Assignee
DuPont Viscoloid 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 DuPont Viscoloid Co filed Critical DuPont Viscoloid Co
Publication of GB474244A publication Critical patent/GB474244A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D7/00—Producing flat articles, e.g. films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/885—External treatment, e.g. by using air rings for cooling tubular films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/919—Thermal treatment of the stream of extruded material, e.g. cooling using a bath, e.g. extruding into an open bath to coagulate or cool the material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)

Abstract

Sheets obtained by extruding plastic material such as cellulose derivative compositions are passed through brine, the temperature of which is relatively low at the point where the sheet is introduced, and progressively increases along the path of travel of the sheet as the solvent content decreases, but is not allowed to rise sufficiently to cause distortion. The seasoning of the sheet is continued further in air. There may be used a plurality of baths of progressively increasing temperature. The brine treatment may be continued until the greater part of the solvent has been removed leaving only about 3--5 per cent of volatile constituents comprising solvent and water. The initial temperature may be below 15 DEG C. The maximum temperature is varied according to the composition of the plastic material. It is preferably at least 45 DEG C. and may be as high as 70 DEG C. The brine baths may consist of sodium chloride solution of about 20 per cent strength. Fresh brine may be added to the baths and used brine removed so as to maintain the solvent content in the bath at 1--3 per cent. In an example, a plastic dough comprising cellulose nitrate, camphor, ethyl alcohol and acetone is extruded into cold brine. The sheet travels through the bath and then successively through a large number of baths maintained at progressively higher temperatures, the final temperature applied to the sheet after six hours being 70 DEG C. The sheet is then seasoned for 2 hours in warm circulating air, and it may then be used for safety glass. Other compositions specified are, cellulose acetate, dimethyl phthalate, diethyl phthalate, alcohol, and acetone, and cellulose acetate, dimethyl phthalate, ethyl alcohol, and methyl ethyl ketone. Cellulose ether plastic compositions may also be used. Specification 393,957 is referred to.
GB11995/36A 1935-04-27 1936-04-27 Improvements in or relating to the production of plastic materials in sheet form Expired GB474244A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US474244XA 1935-04-27 1935-04-27

Publications (1)

Publication Number Publication Date
GB474244A true GB474244A (en) 1937-10-27

Family

ID=21948889

Family Applications (1)

Application Number Title Priority Date Filing Date
GB11995/36A Expired GB474244A (en) 1935-04-27 1936-04-27 Improvements in or relating to the production of plastic materials in sheet form

Country Status (1)

Country Link
GB (1) GB474244A (en)

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