GB1137520A - Treatment of plastic films - Google Patents
Treatment of plastic filmsInfo
- Publication number
- GB1137520A GB1137520A GB27019/66A GB2701966A GB1137520A GB 1137520 A GB1137520 A GB 1137520A GB 27019/66 A GB27019/66 A GB 27019/66A GB 2701966 A GB2701966 A GB 2701966A GB 1137520 A GB1137520 A GB 1137520A
- Authority
- GB
- United Kingdom
- Prior art keywords
- film
- gases
- energizable
- column
- difficultly
- 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
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/10—Surface shaping of articles, e.g. embossing; Apparatus therefor by electric discharge treatment
- B29C59/12—Surface shaping of articles, e.g. embossing; Apparatus therefor by electric discharge treatment in an environment other than air
-
- 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
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/10—Surface shaping of articles, e.g. embossing; Apparatus therefor by electric discharge treatment
- B29C59/103—Surface shaping of articles, e.g. embossing; Apparatus therefor by electric discharge treatment of profiled articles, e.g. hollow or tubular articles
-
- 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
-
- 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
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
-
- 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
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0019—Combinations of extrusion moulding with other shaping operations combined with shaping by flattening, folding or bending
-
- 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
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
- B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
- B29L2023/001—Tubular films, sleeves
Landscapes
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Treatments Of Macromolecular Shaped Articles (AREA)
Abstract
1,137,520. Films. MINNESOTA MINING & MFG. CO. 16 June, 1966 [17 June, 1965], No. 27019/66. Heading B5B. [Also in Division B6] A process for improving the anchorage characteristics of selected areas of plastic film, comprises blanketing a first surface portion of said film with a difficultly energizable gas, contacting a second surface portion of said film with a readily energizable gas, and subjecting said film to corona discharge while continuously blanketing said first surface portion with said difficultly energizable gas to cause a confined treatment of said second surface portions to improve the anchorage characteristics thereof. By difficultly energizable gases are meant gases which have a high dissociation energy and thus do not tend to ionize to form free radicals under the conditions attaining in conventional corona discharge treatment. Thus such gases are not reactive with polymeric film when contacted therewith in an electric field. Most such gases are also inert and non- oxidizing, and may also be described as " inert to the effects of corona discharge " or " non- treating " gases. Specified gases include nitrogen, helium, argon, krypton, neon, xenon, non- ionizing fluorocarbons, and water vapour, e.g. in the form of steam. Readily energizbale gases produce useful corona activation when contacted with film surfaces and are gases which are readily dissociable to form ions or free radicals, for example oxygen, carbon monoxide, nitric oxide and halogens. Such gases are generally strong oxidizing agents. Specified materials include polyolefin films, e.g. polyethylene, polypropylene, and ethylene-propylene copolymers, and in addition, polyurethanes, ethylene-vinyl acetate copolymers, polyamides, polyesters, polyethers, polyvinyl ethers, polyvinyl chlorides, and polyvinylidene chloride. In a preferred method the film may be extruded in the form of a hollow tubular column into an oxygen-containing atmosphere, e.g. air, the inner surface of said column being said first surface portion and the outer surface of said column being said second surface portion, a gaseous nitrogen atmosphere being maintained within said column, the column flattened, and corona discharge treatment applied to the outer surface of the flattened column to improve the anchorage characteristics of the outer surface without substantially altering the anchorage characteristics of the inner surface. In Fig. 1, a tubular column of extruded film 1 is extruded from die 2 which is provided with a circular orifice 3. The tubular column is inflated with a stream of difficultly energizable gas, e.g. nitrogen indicated by arrow 4, introduced through the central portion of the die. A series of collapsing rolls 5 are provided on opposite sides of the extruded film, column 1, to flatten the same prior to corona treatment. The flattened tube is passed over the earthed back-up roll 6 and corona discharge treated on one side by means of voltage applied to treater bar 7. The film may then pass over an idler 8 and then over a second earthed back-up roll 9 for corona discharge treatment on the opposite side by treater bar 10. The film is then further processed, e.g. by slitting and printing and wound up. In Fig. 2, a flat sheet 21 of extruded film from extrusion die 22 is provided on the lower side with a blanket of nitrogen or other difficultly energizable gas by means of spaced discharge tubes 23 along the path of travel of the film. Gas is supplied thereto through manifold 25. The discharge tubes are so located that the film is never permitted to come into contact with air or other readily energizable gas, i.e., the film surface portions to be protected from treatment are extruded directly into an atmosphere of difficultly energizable gas to prevent sorption or occlusion of readily energizable gases on such surface portions. The sheet of film passes over an earthed back-up roll 26 for corona discharge treatment by means of treater bar 27 after passing idler 28. The upper surface being treated is in contact with a readily energizable gas such as oxygen, air being suitable. A blanket of nitrogen is maintained between the sheet of film and the earthed roll as the film is fed under the treater bar. Plastic bags may also be treated by the method of the invention, the bags being first flushed out with the difficultly energizable gas, filled therewith and sealed, and then corona discharge treated. Examples are given.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US464775A US3391070A (en) | 1965-06-17 | 1965-06-17 | Method of selectively treating a plastic film to improve anchorage characteristics |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1137520A true GB1137520A (en) | 1968-12-27 |
Family
ID=23845182
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB27019/66A Expired GB1137520A (en) | 1965-06-17 | 1966-06-16 | Treatment of plastic films |
Country Status (2)
Country | Link |
---|---|
US (1) | US3391070A (en) |
GB (1) | GB1137520A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2205273A (en) * | 1987-05-21 | 1988-12-07 | Gunze Kk | Food-packaging material and process for preparing the same |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3462335A (en) * | 1965-09-13 | 1969-08-19 | Bell Telephone Labor Inc | Bonding of thermoplastic composition with adhesives |
US3661735A (en) * | 1969-10-14 | 1972-05-09 | Johnson & Johnson | Shaped articles having improved surface properties and corona discharge methods and apparatus for making the same |
US4029876A (en) * | 1974-04-01 | 1977-06-14 | Union Carbide Corporation | Heat-treated, corona-treated polymer bodies and a process for producing them |
US4216254A (en) * | 1979-05-05 | 1980-08-05 | Union Carbide Corporation | Method of selectively treating a plastic film surface to prevent blocking |
US4425268A (en) | 1980-02-02 | 1984-01-10 | Bemis Company, Inc. | Polymer blend composition for stretch wrap film |
FR2477950A1 (en) * | 1980-03-11 | 1981-09-18 | Electricite De France | METHOD AND DEVICE FOR PROCESSING STRIPS OF POLYMERIC MATERIAL BY ELECTRIC SHOCK |
US4432820A (en) * | 1982-03-29 | 1984-02-21 | Champion International Corporation | Process for production of polyester-polyolefin film laminates |
FR2608163B1 (en) * | 1986-12-12 | 1989-05-12 | Electricite De France | PROCESS FOR INCREASING THE WETABILITY OF POLYMERS |
US5980814A (en) * | 1995-09-01 | 1999-11-09 | Mcneil-Ppc, Inc. | Method for making an apertured film coated with a surface-active agent |
US9126362B2 (en) | 2012-01-06 | 2015-09-08 | Daniel Brian Tan | Apparatus and method for corona treating film for self opening bags |
WO2013103355A1 (en) * | 2012-01-06 | 2013-07-11 | Tan Daniel Brian | Apparatus and method for corona treating film for self opening bags |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA692019A (en) * | 1964-08-04 | T. Mcbride Richard | Adhereability treatment for organic thermoplastic film | |
GB787403A (en) * | 1953-12-22 | 1957-12-11 | Celanese Corp | Treatment of films of polyethylene resins |
-
1965
- 1965-06-17 US US464775A patent/US3391070A/en not_active Expired - Lifetime
-
1966
- 1966-06-16 GB GB27019/66A patent/GB1137520A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2205273A (en) * | 1987-05-21 | 1988-12-07 | Gunze Kk | Food-packaging material and process for preparing the same |
US4888223A (en) * | 1987-05-21 | 1989-12-19 | Noritsugu Sugimoto | Food-packaging material and process for preparing the same |
GB2205273B (en) * | 1987-05-21 | 1990-07-25 | Gunze Kk | Food-packaging material and process for preparing the same |
Also Published As
Publication number | Publication date |
---|---|
US3391070A (en) | 1968-07-02 |
DE1629540A1 (en) | 1971-01-28 |
DE1629540B2 (en) | 1972-11-16 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB1137520A (en) | Treatment of plastic films | |
US4251585A (en) | Product and process for stretching a tubularly formed sheet of orientable thermoplastic material | |
US4144008A (en) | Apparatus for stretching a tubularly-formed sheet of thermoplastic material | |
DE69407335T2 (en) | Process for continuous silicon oxide coating on solid substrates | |
US3291712A (en) | Surface treatment of shaped organic polymeric structures | |
US3897530A (en) | Method for gusseting continuous lengths of tubular material | |
US4761080A (en) | Multilayer gusseted bag with reverse fin seals | |
US4284458A (en) | Method for producing laminated film | |
US3126680A (en) | Figure | |
US3339234A (en) | Apparatus for making laminated articles | |
US4216254A (en) | Method of selectively treating a plastic film surface to prevent blocking | |
IE36641B1 (en) | A method of manufacturing biaxially stretched plastics films and an apparatus for carrying the method into effect | |
GB1598738A (en) | Receptacle formed from a tubularly-formed sheet of a thermo-plastic material | |
US3666151A (en) | Apparatus for and method of severing film | |
DE1285745B (en) | Manufacture of sealable surfaces on films made of polyolefins or polyethylene terephthalate | |
DE1504661C3 (en) | Process for the continuous treatment of one side of a film web made of thermoplastic material | |
GB1248849A (en) | Method of sealing polyethylene films | |
US3347012A (en) | Sterile packaging | |
US3976418A (en) | Apparatus for gusseting continuous lengths of tubular material | |
GB1002752A (en) | Method and apparatus for producing regenerated cellulose film | |
US20020110681A1 (en) | Plasma treated porous film | |
DE1504458C3 (en) | Biaxially stretched high pressure polyethylene flat sheet and process for its production | |
US3657533A (en) | Plastic tubing electron irradiation apparatus with roller means to flatten the tubing during irradiation | |
AU645900B2 (en) | Process for preparing a tubular plastic film | |
GB1500829A (en) | Method and apparatus for winding up polymeric films |