US3571853A - Electrostatic pinning of extruded polymeric film - Google Patents

Electrostatic pinning of extruded polymeric film Download PDF

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Publication number
US3571853A
US3571853A US823811A US3571853DA US3571853A US 3571853 A US3571853 A US 3571853A US 823811 A US823811 A US 823811A US 3571853D A US3571853D A US 3571853DA US 3571853 A US3571853 A US 3571853A
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US
United States
Prior art keywords
web
wire
electrode
pinning
rods
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
US823811A
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English (en)
Inventor
Melton Orlander Denton
Samuel Eddy Meggs
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.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
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Filing date
Publication date
Application filed by EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
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Publication of US3571853A publication Critical patent/US3571853A/en
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    • 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 drums

Definitions

  • the instant invention provides an improved apparatus for the full sheet electrostatic pinning of a polymeric web to a quenching surface which not only permits the use of increased voltages to achieve a greater pinning force, but additionally is adjustable with respect to the width of the electrostatic field produced.
  • the instant invention provides an improved apparatus for electrostatically pinning a molten web to a quenching surface comprising a wire electrode connected to a high voltage source and supported between lateral supports, the wire electrode positioned above the approximate touchdown point of the web onto the quenching surface, and the width of the web being less than the width of the quenching surface, the improvement wherein the lateral supports comprise electrically insulated conductive rods extending toward the quenching surface, the rods being substantially circular in cross section and terminating with a section extending inwardly and parallel to the quenching the wire electrode joined to the end of the sections of the supporting rods parallel to the quenching surface, the improvement further comprising axially movable sleeves of dielectric material positioned around the junctions of the wire electrode and the supporting rods, the sleeves extending outwardly along the wire and rods from the edges of the web.
  • BRIEF DESCRIPTION OF THE DRAWINGS HG. ii is a cross-sectional view of one embodiment of the electrode support arrangement of the
  • H6. 2 illustrates an apparatus of the instant invention in conjunction with a casting and quenching apparatus.
  • FIG. 3 is a plan view of the apparatus of H6. 2. DESCRlP- TlON OF THE. PREFERRED EMBODlMENTS The instant invention can be readily understood by reference to the drawings, in which the same numerals indicate like elements in the three figures.
  • inward and outward refer to directions along a line parallel to the plane of the quenching surface and perpendicular to its edge, inward and outward respectively indicating a direction toward the middle or edges of the surface.
  • the electrode support is shown in its basic form in H6. 1.
  • Rod ill having insulating layer 111 is provided with holes 12 on the inward extremity through which electrode wire i3 is looped and secured.
  • the rod can be made of any conductive material such as brass, copper, stainless steel and the like and should be of sufficient thickness to support the electrode wire under the desired tension.
  • a one-eighth inch brass 3,73l has been found to be particularly satisfactory for many applications of the instant invention.
  • the rod llll is coupled to a high voltage sourceinot shown) by high voltage connector 1% such as that commercially available from Gremar Manufacturing Co. of Wakefield, Massachusetts, as Model No. 8,731.
  • the conductor is soldered to the end of rod 10 and engages a mating part coupled to the high voltage source.
  • Electrode rod 10 fits snugly in insulator 15, and is held in place on the adjacent framework by female threaded sleeve l6, which engages a threaded male portion (not shown).
  • An essential element of the present invention is slideable insulating sleeve 25 which fits snugly over rod ll) and, with plug 26, engages wire 13 which passes through a small hole in the plug.
  • This sleeve provides means for adjustment of the effective width of the electrode.
  • Materials which can be used for the sleeve include any dielectric that can be formed into a substantially rigid cylinder, such as hard rubbers and resins, e.g., fluorocarbon resins, urea formaldehyde resins, filled phenol formaldehyde resins, nylons and cast epoxy resins.
  • Teflon" fluorocarbon resin is particularly well suited for this application, since it is stable at temperatures encountered in the vicinity of the casting hopper, and has excellent insulating properties.
  • the size of the sleeve will, of course, vary with the size of the supportingrod ill, but, for a rod having a diameter of one-eight inch a sleeve having an inner diameter of about one-eighth inch and an outer diameter of about three-sixteenth inch can be used.
  • the length of the sleeve will vary according to the distance normally encountered between the edge of the extruded film and the end of the support rod to which the wire is attached.
  • H68. 2 and 3 illustrate an apparatus of the present invention mounted on melt extrusion equipment.
  • hopper l7 extrudes molten flat web 18 onto metal quench drum l9.
  • Mounted on frame 20 are electrode supports 21 and 22, which support wire 13 in a manner illustrated in FIG. 1 to maintain wire 13 in a taut condition as it spans roll 19 and web 18.
  • Supports 2i and 22 are electrically coupled to high voltage source 23 which has one side grounded to provide an electrical circuit through roll 19, which is provided with ground 26. It should be observed that quench roll 19 is wider than web it so that bare metal would be exposed to the electrode wire 13 except for insulating sleeves 255 which permit the adjustment of the effective length of the electrode.
  • FlG. 3 is a view from above, omitting the extrusion apparatus in order to better illustrate the invention.
  • the effective length of electrode wire 13 is limited by sleeves 2 to be coextensive with web l8, and the sleeves extend outwardly to cover the junction of the wire and rod.
  • EXAMPLE 1 A polyethylene terephthalate film is extruded and electrostatically pinned onto a quench drum using apparatus similar to that illustrated in FIG. 1 of Owens et al., US. Pat. 3,223,757. The thickness of the film after biaxial orientation is 0.92 mil. The voltage on the pinning apparatus is adjusted to the maximum obtainable without electric breakdown, and the maximum production rate in lbs/hr. at which consistently high quality film can be produced is determined and designated as R.
  • the apparatus comprises one-eighth inch brass supporting rods and Teflon" fluorocarbon resin sleeves.
  • the maximum production rate of the 0.92 mil film obtained using the pinning apparatus of the instant invention is 1.23R.
  • Example 1 is repeated, except that the original thickness of the web is changed to yield a 1.42 mil film after orientation, and the maximum production rate obtainable using the Owens et al. apparatus is designated as R.
  • the maximum production rate obtained using equipment of the instant invention is l.45R'.We claim:
  • an apparatus for electrostatically pinning a molten web to a quenching surface comprising a wire electrode connected to a high voltage source and supported between lateral supports, the wire electrode positioned above the approximate touchdown point of the web onto the quenching surface, and the width of the web being less than the quenching surface
  • the lateral supports comprise electrically insulated conductive rods extending toward the quenching surface, the rods being substantially circular in cross section and terminating with a section extending inwardly and parallel to the quenching surface, the wire electrode joined to the ends of the sections of the supporting rods parallel to the quenching surface, the improvement further comprising axially movable sleeves of dielectric material positioned around the junctions of the wire electrode and the supporting rods, the sleeve extending outwardly along the wire and rods from the edge of the web.
  • rods consist essentially of brass and have a diameter of about one-eighth inch and wherein the rods are electrically insulated by an outer layer of fluorocarbon resin.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Moulding By Coating Moulds (AREA)
US823811A 1969-05-12 1969-05-12 Electrostatic pinning of extruded polymeric film Expired - Lifetime US3571853A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US82381169A 1969-05-12 1969-05-12

Publications (1)

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US3571853A true US3571853A (en) 1971-03-23

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ID=25239794

Family Applications (1)

Application Number Title Priority Date Filing Date
US823811A Expired - Lifetime US3571853A (en) 1969-05-12 1969-05-12 Electrostatic pinning of extruded polymeric film

Country Status (9)

Country Link
US (1) US3571853A (enrdf_load_stackoverflow)
JP (1) JPS5125451B1 (enrdf_load_stackoverflow)
BE (1) BE750212A (enrdf_load_stackoverflow)
CA (1) CA976503A (enrdf_load_stackoverflow)
DE (2) DE2022886C3 (enrdf_load_stackoverflow)
FR (1) FR2047670A5 (enrdf_load_stackoverflow)
GB (1) GB1304439A (enrdf_load_stackoverflow)
LU (1) LU60906A1 (enrdf_load_stackoverflow)
NL (1) NL168164C (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3758251A (en) * 1971-12-02 1973-09-11 Du Pont Electrostatic pinning of polymeric film
JPS4955759A (enrdf_load_stackoverflow) * 1972-05-12 1974-05-30
JPS5141053A (enrdf_load_stackoverflow) * 1974-08-07 1976-04-06 Ici Ltd
US4071589A (en) * 1972-05-12 1978-01-31 Imperial Chemical Industries Limited Quenching of polymeric film
US4111625A (en) * 1974-08-07 1978-09-05 Imperial Chemical Industries Limited Polymeric film production
EP0026028A1 (en) * 1979-08-01 1981-04-01 Imperial Chemical Industries Plc Apparatus and process for extruding and quenching a thermoplastics film
JP2022532561A (ja) * 2019-05-09 2022-07-15 ブリュックナー・マシーネンバウ・ゲーエムベーハー・ウント・コー・カーゲー 注型薄膜製造装置と注型薄膜製造装置を備える薄膜延伸装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS533463U (enrdf_load_stackoverflow) * 1976-06-28 1978-01-13

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3223757A (en) * 1960-05-03 1965-12-14 Du Pont Process for quenching extruded polymeric film
US3427687A (en) * 1966-11-07 1969-02-18 Miller Mold Co Mold construction

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3223757A (en) * 1960-05-03 1965-12-14 Du Pont Process for quenching extruded polymeric film
US3427687A (en) * 1966-11-07 1969-02-18 Miller Mold Co Mold construction

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3758251A (en) * 1971-12-02 1973-09-11 Du Pont Electrostatic pinning of polymeric film
JPS4955759A (enrdf_load_stackoverflow) * 1972-05-12 1974-05-30
US4071589A (en) * 1972-05-12 1978-01-31 Imperial Chemical Industries Limited Quenching of polymeric film
JPS5141053A (enrdf_load_stackoverflow) * 1974-08-07 1976-04-06 Ici Ltd
US4111625A (en) * 1974-08-07 1978-09-05 Imperial Chemical Industries Limited Polymeric film production
EP0026028A1 (en) * 1979-08-01 1981-04-01 Imperial Chemical Industries Plc Apparatus and process for extruding and quenching a thermoplastics film
US4309368A (en) * 1979-08-01 1982-01-05 Imperial Chemical Industries Limited Electrostatic pinning of extruded thermoplastic film
JP2022532561A (ja) * 2019-05-09 2022-07-15 ブリュックナー・マシーネンバウ・ゲーエムベーハー・ウント・コー・カーゲー 注型薄膜製造装置と注型薄膜製造装置を備える薄膜延伸装置
US11919217B2 (en) 2019-05-09 2024-03-05 Brückner Maschinenbau GmbH System for producing a cast film, and film stretching installation with such a system

Also Published As

Publication number Publication date
NL7006768A (enrdf_load_stackoverflow) 1970-11-16
FR2047670A5 (enrdf_load_stackoverflow) 1971-03-12
LU60906A1 (enrdf_load_stackoverflow) 1970-07-16
CA976503A (en) 1975-10-21
NL168164C (nl) 1982-03-16
DE2022886C3 (de) 1979-05-23
DE2022886B2 (de) 1978-09-28
JPS5125451B1 (enrdf_load_stackoverflow) 1976-07-31
DE2022886A1 (de) 1970-11-19
GB1304439A (enrdf_load_stackoverflow) 1973-01-24
NL168164B (nl) 1981-10-16
BE750212A (fr) 1970-11-12
DE7017571U (de) 1970-08-06

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