GB1475805A - Electrostatic pinning of extruded polymeric film - Google Patents

Electrostatic pinning of extruded polymeric film

Info

Publication number
GB1475805A
GB1475805A GB3433774A GB3433774A GB1475805A GB 1475805 A GB1475805 A GB 1475805A GB 3433774 A GB3433774 A GB 3433774A GB 3433774 A GB3433774 A GB 3433774A GB 1475805 A GB1475805 A GB 1475805A
Authority
GB
United Kingdom
Prior art keywords
film
electrode
extruded
voltage
waveform
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
GB3433774A
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.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical Industries Ltd
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 Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Priority to GB3433774A priority Critical patent/GB1475805A/en
Priority to NL7508966A priority patent/NL7508966A/en
Priority to US05/599,935 priority patent/US4046842A/en
Priority to IT7525930A priority patent/IT1040244B/en
Priority to AU83537/75A priority patent/AU486288B2/en
Priority to DE19752534761 priority patent/DE2534761A1/en
Priority to FR7524231A priority patent/FR2281207A1/en
Priority to LU73142A priority patent/LU73142A1/xx
Priority to BE158948A priority patent/BE832131A/en
Priority to JP50095363A priority patent/JPS5141060A/ja
Priority to US05/793,429 priority patent/US4162139A/en
Publication of GB1475805A publication Critical patent/GB1475805A/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
    • 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
    • B29C48/915—Cooling of flat articles, e.g. using specially adapted supporting means with means for improving the adhesion to the supporting means
    • B29C48/9165—Electrostatic pinning
    • 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
    • B29C48/911—Cooling
    • B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
    • B29C48/914—Cooling of flat articles, e.g. using specially adapted supporting means cooling drums

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Moulding By Coating Moulds (AREA)

Abstract

1475805 Pinning extruded film IMPERIAL CHEMICAL INDUSTRIES Ltd 14 July 1975 [5 Aug 1974] 34337/74 Heading B5B [Also in Division H1] In manufacturing a polymeric film, e.g. of PTFE or a wide variety of polymeric or copolymeric plastics, an extruded molten film is passed across a grounded cooled casting surface to which it is electrostatically adherent; an electrode being positioned proximate to the contact region of the film and the surface to deposit charge on the film and being energized with alternating voltage of asymmetrical or symmetrical waveform such that the voltage exceeds corona inception for at least 75% of each half cycle and discharge is inhibited for at least 10 Ás per half cycle; and the frequency does not exceed that at which positive and negative charges of the electrode are prevented from traversing the film to electrode space before polarity change of the electrode voltage. Film is extruded through a slotted die spaced closely to the casting surface, which may be a moving belt or a smooth metal, e.g. steel roller which is water cooled to a required temperature. A pinning electrode is disposed traversely of the film proximate to the contact region of the surface. The electrode may be of wire, knife edge, or comb form made of, e.g. stainless steel, tungsten, nickel iron alloy or chrome alloy with its marginal regions insulated with, e.g. PTFE. A wire electrode may be continuously drawn across the film from a new supply, or may circulate continuously through a cleaning bath to remove deposits. Alternatively a gas or air blast may be directed between the electrode and the film, or the electrode may be heated to prevent deposition of foreign matter. The applied voltage between the electrode and the drum may be of a waveform which is asymmetrically sinusoidal, square wave, trapezoidal wave, or modified squarewave or trapezoidal waveform derived from a pulse generator, power amplifier, and transformer (Figs. 1 to 4, not shown). Reference has been directed by the Comptroller to Specifications 1,446,596 and 1,129,136.
GB3433774A 1973-02-07 1974-08-05 Electrostatic pinning of extruded polymeric film Expired GB1475805A (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
GB3433774A GB1475805A (en) 1974-08-05 1974-08-05 Electrostatic pinning of extruded polymeric film
NL7508966A NL7508966A (en) 1974-08-05 1975-07-28 METHOD AND DEVICE FOR ELECTROSTATIC CUTTING OF A POLYMER FILM ON A SURFACE.
US05/599,935 US4046842A (en) 1973-02-07 1975-07-28 Casting of polymeric film
IT7525930A IT1040244B (en) 1974-08-05 1975-07-30 IMPROVEMENTS MADE TO THE CO LATE OF POLYMERIC FILMS
AU83537/75A AU486288B2 (en) 1974-08-05 1975-07-30 Improvements inthe casting of polymeric film
DE19752534761 DE2534761A1 (en) 1974-08-05 1975-08-04 METHOD OF CASTING POLYMER FILMS
FR7524231A FR2281207A1 (en) 1974-08-05 1975-08-04 IMPROVEMENTS IN THE CASTING OF POLYMER FILMS
LU73142A LU73142A1 (en) 1974-08-05 1975-08-04
BE158948A BE832131A (en) 1974-08-05 1975-08-05 IMPROVEMENTS IN POLYMER FILM CASTING
JP50095363A JPS5141060A (en) 1974-08-05 1975-08-05
US05/793,429 US4162139A (en) 1973-02-07 1977-05-03 Casting of polymeric film

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3433774A GB1475805A (en) 1974-08-05 1974-08-05 Electrostatic pinning of extruded polymeric film

Publications (1)

Publication Number Publication Date
GB1475805A true GB1475805A (en) 1977-06-10

Family

ID=10364390

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3433774A Expired GB1475805A (en) 1973-02-07 1974-08-05 Electrostatic pinning of extruded polymeric film

Country Status (8)

Country Link
JP (1) JPS5141060A (en)
BE (1) BE832131A (en)
DE (1) DE2534761A1 (en)
FR (1) FR2281207A1 (en)
GB (1) GB1475805A (en)
IT (1) IT1040244B (en)
LU (1) LU73142A1 (en)
NL (1) NL7508966A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5517559A (en) * 1978-07-25 1980-02-07 Toyobo Co Ltd Method of cooling polyamide polymer sheet
JPS60214922A (en) * 1984-04-11 1985-10-28 Sumitomo Bakelite Co Ltd Manufacture of thermoplastic resin film

Also Published As

Publication number Publication date
DE2534761A1 (en) 1976-02-26
FR2281207B1 (en) 1977-12-16
AU8353775A (en) 1977-02-03
NL7508966A (en) 1976-02-09
IT1040244B (en) 1979-12-20
LU73142A1 (en) 1977-01-07
BE832131A (en) 1976-02-05
JPS5141060A (en) 1976-04-06
FR2281207A1 (en) 1976-03-05

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee