GB669907A - Improvements in or relating to the manufacture of moisture-proof sheet wrapping materials - Google Patents
Improvements in or relating to the manufacture of moisture-proof sheet wrapping materialsInfo
- Publication number
- GB669907A GB669907A GB6292/49A GB629249A GB669907A GB 669907 A GB669907 A GB 669907A GB 6292/49 A GB6292/49 A GB 6292/49A GB 629249 A GB629249 A GB 629249A GB 669907 A GB669907 A GB 669907A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sheet
- emulsion
- per cent
- base sheet
- layer
- 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
Links
Classifications
-
- 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
- B29C48/911—Cooling
- B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Laminated Bodies (AREA)
Abstract
An aqueous emulsion of vinylidene chloride polymer or copolymer is applied to a base sheet of hydrophilic, water-insoluble, non-fibrous organic material in a layer of such thinness that the water of the emulsion is substantially wholly absorbed by the base sheet and the dispersed polymer or copolymer deposited on the sheet in the form of a layer, and the layer is stripped from the base sheet to form a sheet of moisture-proof wrapping material. The deposited layer is preferably dried and consolidated by heat either before or after stripping. The base sheet may be in the form of a sheet, a continuous length or an endless band, thus making the process discontinuous or continuous. Preferably, it has a smooth surface and shows a variation of diffusion coefficient (as defined in the Specification) with water content to ensure a short time lag before extraction of the water of the emulsion begins. The preferred basesheet is a film of regenerated cellulose, but other materials such as lowly substituted cellulose esters and ethers, alginic and albuminous materials and wholly or superficially saponified cellulose acetate may be utilized. The regenerated cellulose base sheet should preferably have a water content (based on the dry sheet) of between 4 per cent and 8 per cent. The relative thicknesses of the regenerated cellulose basesheet and of the emulsion layer should be such that when absorption is complete the water content of the regenerated cellulose sheet should be between 15 and 30 per cent (based on the oven dry weight), thus facilitating stripping. The base sheet may be a thick film as cast or a laminated sheet. The preferred copolymers for the emulsion contain between 80 and 98 per cent monomeric vinylidene chloride, the remaining ingredient or ingredients being vinyl chloride, styrene, acrylonitrile or an alkyl acrylate or alkacrylate in which both the alkyl group of the ester group and that of the acid group comprise not more than 4 carbon atoms. The stripped, dried film may be cold stretched if desired. In an example (all parts by weight) an aqueous emulsion is prepared from 9 parts of vinylidene chloride, 1 part of acrylonitrile, 1 part of a 20 per cent aqueous solution of the sodium salt of C12-C18 alkyl sulphates, 0.06 part of ammonium persulphate, 0.03 part of sodium metabisulphite and 12.5 parts of water. In the cold emulsion (after polymerization at 39 DEG C.) a laminated sheet of regenerated cellulose (0.006 inch thick and 4 per cent water content) is immersed for 1 second, withdrawn and allowed to drain for 15 seconds. The deposited layer is stripped off and dried and consolidated by radiant heat to give a clear moisture-proof film 0.0008 inch thick. Specifications 654,342 and 655,732 are referred to.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB6292/49A GB669907A (en) | 1949-03-08 | 1949-03-08 | Improvements in or relating to the manufacture of moisture-proof sheet wrapping materials |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB6292/49A GB669907A (en) | 1949-03-08 | 1949-03-08 | Improvements in or relating to the manufacture of moisture-proof sheet wrapping materials |
Publications (1)
Publication Number | Publication Date |
---|---|
GB669907A true GB669907A (en) | 1952-04-09 |
Family
ID=9811834
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB6292/49A Expired GB669907A (en) | 1949-03-08 | 1949-03-08 | Improvements in or relating to the manufacture of moisture-proof sheet wrapping materials |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB669907A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1290912B (en) * | 1960-06-29 | 1969-03-20 | Formica Internat Ltd | Process for the production of glass fiber material coated with perfluorocarbon polymers |
-
1949
- 1949-03-08 GB GB6292/49A patent/GB669907A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1290912B (en) * | 1960-06-29 | 1969-03-20 | Formica Internat Ltd | Process for the production of glass fiber material coated with perfluorocarbon polymers |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2684919A (en) | Production of moistureproof films | |
GB466879A (en) | Improvements relating to photographic materials | |
US2910385A (en) | Production of moistureproof sheet wrapping materials coated with copolymers applied from aqueous dispersions | |
JPS5235238A (en) | Emulsion composition | |
GB669907A (en) | Improvements in or relating to the manufacture of moisture-proof sheet wrapping materials | |
US3085901A (en) | Process for coating regenerated cellulose film with subcoat of cellulose nitrate and thermosetting resin and topcoat of vinylidene chloride copolymer | |
US2541167A (en) | Vinylidene chloride interpolymer as a coating for regenerated cellulose film | |
US4248912A (en) | Process for preparing packaging material suitable for sausage casings | |
GB818041A (en) | Process for the production of sheet-like structures from polymer emulsions | |
US2228332A (en) | Coating objects with artificial materials | |
GB1248214A (en) | Process for the preparation of porous sheet material | |
US2961340A (en) | Process for coating hydrophilic films | |
US2809945A (en) | Polyvinyl acetate emulsions stabilized with hydroxyethyl cellulose and method of preparation | |
US2473708A (en) | Polymerized vinyl aromatic materials | |
US4229507A (en) | Method for drying wood material | |
US2914808A (en) | Process for forming films from nonelastic polymer latexes | |
GB721305A (en) | Improvements in or relating to the manufacture of moisture-proof sheet wrapping materials | |
JPS5545732A (en) | Electrodeposition insulation coating material | |
JPS575739A (en) | Vinyl chloride plastisol composition | |
US2929108A (en) | Method for preparing conductive latex films | |
GB718137A (en) | Polymeric compositions | |
US4420514A (en) | Polymer film treatment with organic impregnant | |
US2261769A (en) | Process of manufacturing rubber articles | |
US2721151A (en) | Coated cellulosic pellicles and methods of producing the same | |
SU834021A1 (en) | Composition based on copolymer aqueous dispersion |