UST911016I4 - Tubular preparation of thermoplastic film - Google Patents

Tubular preparation of thermoplastic film Download PDF

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Publication number
UST911016I4
UST911016I4 US911016DH UST911016I4 US T911016 I4 UST911016 I4 US T911016I4 US 911016D H US911016D H US 911016DH US T911016 I4 UST911016 I4 US T911016I4
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United States
Prior art keywords
tube
rolls
idler rolls
quenching
distribute
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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.)
Pending
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Publication date
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Publication of UST911016I4 publication Critical patent/UST911016I4/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
    • B29C48/03—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
    • 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

Definitions

  • the tube be oscillated through a rotational cycle of 180 at a rotational speed of v/Zd wherein v is the linear speed of the tube being extruded and d is the distance between the extrusion die and the region of initial orientation expansion to distribute gauge irregularities throughout the full circumference of the tube.
  • Oscillation of the tube is accomplished by rotation of a tube advancer comprising a plurality of idler rolls circularly disposed around the internal wall of the quenched tube and a plurality of driven rolls in cooperative arrangement with the idler rolls circumferentially positioned immediately exterior to the tube, the idler rolls and the driven rolls each being mounted on rotatable frames.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

IN A CONTINUOUS PROCESS FOR PRODUCING AN ORIENTED THERMOPLASTIC FILM COMPRISING EXTRUDING A THERMOPLASTIC MATERIAL IN ITS FORMATIVE STATE INTO THE FORM OF A TUBE, QUENCHING THE TUBE TO A TEMPERATURE BELOW ITS FORMATIVE STATE, REHEATING THE TUBE TO A TEMPATURE WITHIN ITS ORIENTATION TEMPERATURE RANGE, EXPANDING THE TUBE AND THEREAFTER COLLAPSING AND COLLECTING THE TUBE, THE IMPROVEMENT WHICH COMPRISES OSCILLATING THE TUBE ABOUT ITS AXIS BY APPLYING ROTATIONAL TORQUE TO THE TUBE AFTER QUENCHING AND BEFORE REHEATING TO DISTRIBUTE GUAGE IRREGULARITIES ABOUT THE CIRCUMFERENCE OF THE TUBE. IT IS PREFERRED THAT THE TUBE BE OSCILLATED THROUGH A ROTATIONAL CYCLE OF 180* AT A ROTATIONAL SPEED OF V/2D WHEREIN V IS THE LINEAR SPEED OF THE TUBE BEING EXTRUDED AND D IS THE DISTANCE BETWEEN THE EXTRUSION DIE AND THE REGION OF INITIAL ORIENTATION EXPANSION TO DISTRIBUTE GUAGE IRREGULARITIES THROUGHOUT THE FULL CIRCUMFERENCE OF THE TUBE. OSCILLATION OF THE TUBE IS ACCOMPLISHED BY ROTATION OF A TUBE ADVANCER COMPRISING A PLURALITY OF IDLER ROLLS CIRCULARLY DISPOSED AROUND THE INTERNAL WALL OF THE QUENCHED TUBE AND A PLURALITY OF DRIVEN ROLLS IN COOPERATIVE ARRANGEMENT WITH THE IDLER ROLLS CIRCUMFERENTIALLY POSITIONED IMMEDIATELY EXTERIOR TO THE TUBE, THE IDLER ROLLS AND THE DRIVEN ROLLS EACH BEING MOUNTED ON ROTATABLE FRAMES.

Description

DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at the request of the applicant or owner in accordance with the Notice of Dec. 16, 1969, 869 0.6. 687. The abstracts of Defensive Publication applications are identified by distinctly numbered series and are arranged chronologically. The heading of each abstract indicates the number of pages of specification, including claims and sheets of drawings contained in the application as originally filed. The files of these applications are available to the public for inspection and reproduction may be purchased for 30 cents a sheet.
Defensive Publication applications have not been examined as to the merits of alleged invention. The Patent Ofiice makes no assertion as to the novelty of the disclosed subject matter.
PUBLISHED JUNE 26, 1973 T911,016 TUBULAR PREPARATION OF THERMOPLASTIC FILM Edward J. Moore, Florence, S.C., assignor to E. I. du Pont de Nernours and Company, Wilmington, Del.
Continuation of abandoned application Ser. No. 36,034,
May 11, 1970. This application Mar. 30, 1972, Ser.
Int. Cl. B29c 5/04, 23/00; 182% 9/24 2 Sheets Drawing. 3 Pages Specification In a continuous process for producing an oriented thermoplastic film comprising extruding a thermoplastic material in its formative state into the form of a tube, quenching the tube to a temperature below its formative state, reheating the tube to a temperature within its orientation temperature range, expanding the tube and there after collapsing and collecting the tube, the improvement which comprises oscillating the tube about its axis by applying rotational torque to the tube after quenching and before reheating to distribute gauge irregularities about the circumference of the tube.
It is preferred that the tube be oscillated through a rotational cycle of 180 at a rotational speed of v/Zd wherein v is the linear speed of the tube being extruded and d is the distance between the extrusion die and the region of initial orientation expansion to distribute gauge irregularities throughout the full circumference of the tube.
Oscillation of the tube is accomplished by rotation of a tube advancer comprising a plurality of idler rolls circularly disposed around the internal wall of the quenched tube and a plurality of driven rolls in cooperative arrangement with the idler rolls circumferentially positioned immediately exterior to the tube, the idler rolls and the driven rolls each being mounted on rotatable frames.
June 26, 1973 E. J. MOORE TUBULAR PREPARATION 01" THERMOPLASTIC PHIM 2 Sheets-Shea t 1 Original Filed m 11, 1970 3W9 QNIGNVIS (1i SNIIHVIS EISVS SNIGNVIS 'IVHGISHH INVENTOR MOORE EDWARD J.
T9ll,016
June 26, 1973 E. J MOORE TUBULAR PREPARATION OI" THERMOPLASTIC FILM 2 Sheets-Sheet.
Original Filed May 11, 1970
US911016D 1972-03-30 1972-03-30 Tubular preparation of thermoplastic film Pending UST911016I4 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US23976872A 1972-03-30 1972-03-30

Publications (1)

Publication Number Publication Date
UST911016I4 true UST911016I4 (en) 1973-06-26

Family

ID=22903648

Family Applications (1)

Application Number Title Priority Date Filing Date
US911016D Pending UST911016I4 (en) 1972-03-30 1972-03-30 Tubular preparation of thermoplastic film

Country Status (1)

Country Link
US (1) UST911016I4 (en)

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