US1911858A - Extrusion die - Google Patents

Extrusion die Download PDF

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Publication number
US1911858A
US1911858A US549171A US54917131A US1911858A US 1911858 A US1911858 A US 1911858A US 549171 A US549171 A US 549171A US 54917131 A US54917131 A US 54917131A US 1911858 A US1911858 A US 1911858A
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US
United States
Prior art keywords
die
extrusion die
nozzle
orifices
insulating material
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
US549171A
Inventor
Bruno M A Trebes
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.)
AT&T Corp
Original Assignee
Bell Telephone Laboratories Inc
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 Bell Telephone Laboratories Inc filed Critical Bell Telephone Laboratories Inc
Application granted granted Critical
Publication of US1911858A publication Critical patent/US1911858A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/30Extrusion nozzles or dies
    • B29C48/32Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
    • B29C48/34Cross-head annular extrusion nozzles, i.e. for simultaneously receiving moulding material and the preform to be coated
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03Extrusion 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
    • B29C48/06Rod-shaped
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03Extrusion 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
    • B29C48/05Filamentary, e.g. strands

Definitions

  • apparatus for extruding insulating material upon cores for applying the insulating material in a plurality of layers comprises a number of die members of successively increasing diameters all having their exit orifices substantially in the same plane taken transversely of the core.
  • the object of the prior arrangement was to obtain a satisfactory application of insulating material notwithstanding any slight fiexure of the cable immediately after leaving the dies.
  • Fig. 1 is a sectional elevation of an arrangement according to the invention
  • FIG. 2 is a sectional view of the die block shown in the arrangement shown in Fig. 1 through line 22 thereon.
  • Fig. 1 of the drawing is shown an electrical conductor 1 passing through an extrud ing head for the purpose of being covered with three layers of insulating material.
  • extruding head comprises a nozzle 2 screwed into the pipe 3 in which, as described in the patent referred to, pressure equalizing material is applied under pressure.
  • nozzle 2 Surrounding the nozzle 2 are dies 4 and 5 having exit orifices of successively increasing diameter and thefinal sizingdie 6.
  • the dies-4 and 5. consist of nozzle-like members screwed onto a: permanent supporting member 7 carried. on the aforementioned end of the tube3 and the three orifices 8, 9, 10, formed between the" nozzle 2 and the sizing die 6, lie in thesame plane while the nozzle 2 itself extends in.
  • Y the permanent supporting member 7 is clearly illustrated in Fig. 2. It consists as shown of a casting formed or secured on the end of the tube 3 and comprising cross members 11 serving to maintain ring members 12 and 13- on which the die members 4 and 5 are screwed in correct spaced relation.
  • cross members 11 of the extrusion head also pose of varying the thickness of the layer of the insulating material applied to the cable, or for any other purpose.
  • the use 5 of the extending nozzle 2 is not restricted to an embodiment in an extrusion head in which the die members are screwed on to a permanent member as described above, but the head.
  • An extrusion die of the type which is adapted to apply simultaneously a plurality of layers of plastic material to a central core substance, the die comprising in combina-* tion, a central orifice'throughwhich the core substance passes, and a plurality of sur- M V rounding concentric orifices, the central orifice extending outward a short distancebeyond the plane of the surrounding orifices.

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

Description

May 30, 1933. B TREBES 1,911,858
EXTRUS ION DI E Filed July 1931 INVENTOP B. M A. TPEBES srfigk/Jw ATTORNEY Patented May 30, 1933 UNITED STATES NT OFFICE:
BRUNO M. A. TREBES, or BEBWYN, ILLINOIS, ASSIGNOR T ELL TELEPHONE nAno naromns, INCORPORATED, on NEW YORK, N. Y.,'A CORPORATION or'nnw Yoaxi f EXTRUSION DIE 7 Application filed July 7, 1931, Ser'al No. 549,171, and in Great Britain December 3, 1930.
This invention is an improvement in 'or modification of the arrangement disclosed in applicants Patent 1,859,901, granted May 24, 1932.
In this patent, apparatus for extruding insulating material upon cores for applying the insulating material in a plurality of layers is disclosed. This apparatus comprises a number of die members of successively increasing diameters all having their exit orifices substantially in the same plane taken transversely of the core. The object of the prior arrangement was to obtain a satisfactory application of insulating material notwithstanding any slight fiexure of the cable immediately after leaving the dies.
It has been found, however, that the above arrangement is not altogether satisfactory but that still further improved results can be obtained, in accordance with the present invention, oy extending the central nozzle from which the core emerges a. short distance beyond the plane of the exit orifices of the other die members. The extension is normally only a matter of a few millimeters but it serves as a protector for the soft coating of equalizing medium already on the core at the place of application of the several layers of insulating material. By this means, the soft coating is protected against distortion by any eddy cur rents in the insulating material which are set up. even with the stream line arrangement described in the patent referred to.
The invention will be readily understood with reference to the accompanying drawing in which,
Fig. 1 is a sectional elevation of an arrangement according to the invention,
2 is a sectional view of the die block shown in the arrangement shown in Fig. 1 through line 22 thereon.
In Fig. 1 of the drawing is shown an electrical conductor 1 passing through an extrud ing head for the purpose of being covered with three layers of insulating material. The
extruding head comprises a nozzle 2 screwed into the pipe 3 in which, as described in the patent referred to, pressure equalizing material is applied under pressure. Surrounding the nozzle 2 are dies 4 and 5 having exit orifices of successively increasing diameter and thefinal sizingdie 6. The dies-4 and 5. consist of nozzle-like members screwed onto a: permanent supporting member 7 carried. on the aforementioned end of the tube3 and the three orifices 8, 9, 10, formed between the" nozzle 2 and the sizing die 6, lie in thesame plane while the nozzle 2 itself extends in.
advance of thisplane for a distance of a few millimeters depending on the diameters of the insulating layer to be applied'to the core.
In extruding thermoplastic insulation ofdiameters from to mm. at a speed of 300 meters per hour, it was foundby experi-' mentation that the optimum. length of the extension of the tip of'the nozzle 2 is between 2 and 3 mm. The length. of'the extension of the tip required to produce the-best results under other conditions may be determined by experimentation in accordance with the Scope of this invention. It is believed that in general the extension of the tip required for insulatingca-ble conductors of all ordinary and usual sizes will not diifer very much from the one specified above.
The construction of Y the permanent supporting member 7 is clearly illustrated in Fig. 2. It consists as shown of a casting formed or secured on the end of the tube 3 and comprising cross members 11 serving to maintain ring members 12 and 13- on which the die members 4 and 5 are screwed in correct spaced relation.
The various passages leading to the three exit orifices 8, 9 and 10 are stream-lined as described in the above mentioned patent, the
cross members 11 of the extrusion head also pose of varying the thickness of the layer of the insulating material applied to the cable, or for any other purpose.
It will readily be understood that the use 5 of the extending nozzle 2 is not restricted to an embodiment in an extrusion head in which the die members are screwed on to a permanent member as described above, but the head.
may be formed in any desired workmanlike 1o manner, such as entirely by casting, which is within the scope of the appended claims.
What is claimed is:
1. An extrusion die of the type which is adapted to apply simultaneously a plurality of layers of plastic material to a central core substance, the die comprising in combina-* tion, a central orifice'throughwhich the core substance passes, and a plurality of sur- M V rounding concentric orifices, the central orifice extending outward a short distancebeyond the plane of the surrounding orifices.-
, 2. An extrusion die of the type which is adapted to apply simultaneously a plurality of layers of plastic material to a central core substance, the die comprising in combination,
a central orifice through which the core substance passes, and a plurality of surrounding concentric orifices, the central orifice extending outward a short distance beyond the so plane of the surrounding orifices by a'length which is not less than two and one half millimeters and which is not more than three millimeters. 1 V
In witness whereof, I hereunto subscribe my name this 30th day of June, 1931. i
BRUNO M. A. TREBES.
US549171A 1930-12-03 1931-07-07 Extrusion die Expired - Lifetime US1911858A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1911858X 1930-12-03

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2761791A (en) * 1955-02-23 1956-09-04 Eastman Kodak Co Method of multiple coating
FR2321381A1 (en) * 1975-08-22 1977-03-18 Bekum Maschf Gmbh DISTRIBUTOR OF MELTED MATERIAL IN A BLOWING OR TUBULAR HEAD USED FOR FORMING PLASTIC TUBES
US4174935A (en) * 1977-12-14 1979-11-20 General Electric Company Extrusion apparatus for producing elongated core members covered with concentric coatings
US5215698A (en) * 1991-11-25 1993-06-01 Americraft Machined Products, Inc. Extrusion tool and method of extrusion coating
US5534206A (en) * 1992-09-25 1996-07-09 Mitsubishi Pencil Kabushiki Kaisha Method for preparing baked pencil leads using concentric straightening plates
US20080038392A1 (en) * 2006-07-27 2008-02-14 Michelin Recherche Et Technique S.A. Cord sheathing device with a mobile die

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2761791A (en) * 1955-02-23 1956-09-04 Eastman Kodak Co Method of multiple coating
FR2321381A1 (en) * 1975-08-22 1977-03-18 Bekum Maschf Gmbh DISTRIBUTOR OF MELTED MATERIAL IN A BLOWING OR TUBULAR HEAD USED FOR FORMING PLASTIC TUBES
US4174935A (en) * 1977-12-14 1979-11-20 General Electric Company Extrusion apparatus for producing elongated core members covered with concentric coatings
US5215698A (en) * 1991-11-25 1993-06-01 Americraft Machined Products, Inc. Extrusion tool and method of extrusion coating
US5534206A (en) * 1992-09-25 1996-07-09 Mitsubishi Pencil Kabushiki Kaisha Method for preparing baked pencil leads using concentric straightening plates
US20080038392A1 (en) * 2006-07-27 2008-02-14 Michelin Recherche Et Technique S.A. Cord sheathing device with a mobile die
US20110220254A1 (en) * 2006-07-27 2011-09-15 Michelin Recherche Et Technique S.A. Process for Sheathing a Cord Using a Cord Sheathing Device

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