GB798527A - Improvements relating to extrusion dies for plasticised matter - Google Patents

Improvements relating to extrusion dies for plasticised matter

Info

Publication number
GB798527A
GB798527A GB10765/56A GB1076556A GB798527A GB 798527 A GB798527 A GB 798527A GB 10765/56 A GB10765/56 A GB 10765/56A GB 1076556 A GB1076556 A GB 1076556A GB 798527 A GB798527 A GB 798527A
Authority
GB
United Kingdom
Prior art keywords
orifice
die
dimension
length dimension
height
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
GB10765/56A
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.)
Pirelli and C SpA
Original Assignee
Pirelli SpA
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 Pirelli SpA filed Critical Pirelli SpA
Publication of GB798527A publication Critical patent/GB798527A/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
    • B29C48/03—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
    • B29C48/12—Articles with an irregular circumference when viewed in cross-section, e.g. window profiles
    • 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

Landscapes

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

Abstract

798,527. Dies for extruding tyre tread bands &c. PIRELLI SOC. PER AZIONI. April. 9, 1956 [April 9, 1955], No. 10765/56. Class 87(2). An extrusion die is so designed that the resistance to flow of plastic material as it is forced through the die, by the surfaces of the orifice of the die, varies from point to point across the orifice with the height dimension of the orifice in the sense that the greater the height dimension from side to side of the orifice the greater the resistance to flow and vice-versa. In a die for extruding a tyre tread band, Figs. 5 and 6, L3, Fig. 6, represents the length dimension of the orifice at the portion 4, which has a height dimension h3. The two side portion 5 of the orifice decrease in height and length dimension in the direction away from the central portion, the minimum length dimension L6 being the minimum thickness of material capable of withstanding the extrusion pressure. The design of orifice is governed by the empirical formula where L<SP>1</SP> and L<SP>2</SP> are the greater and less length dimensions at two transversely spaced points, h<SP>1</SP> and h<SP>2</SP> are the corresponding height dimensions and n is a constant appropriate to the material being extruded. A deflector 6, opposite the central portion of the die and directed upstream, ensures continuous flow of the whole of the plastic material to the orifice. Fig.4 shows a die which tapers at 2 on one side of the orifice according to the above relationship; also means for varying the length dimension of the orifice in the form of a recess 3 on the downstream side. In a modification, a projection on the downstream side of the orifice may combine with a recess to provide in conjunction with the surfaces of the orifice proper, the required variation in length dimension, the passage of the material through those parts of the orifice of reduced height dimension being braked by the recess and the projection as it flows unhindered from the orifice. Specification 661,556 is referred to.
GB10765/56A 1955-04-09 1956-04-09 Improvements relating to extrusion dies for plasticised matter Expired GB798527A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT798527X 1955-04-09

Publications (1)

Publication Number Publication Date
GB798527A true GB798527A (en) 1958-07-23

Family

ID=11316830

Family Applications (1)

Application Number Title Priority Date Filing Date
GB10765/56A Expired GB798527A (en) 1955-04-09 1956-04-09 Improvements relating to extrusion dies for plasticised matter

Country Status (1)

Country Link
GB (1) GB798527A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4285655A (en) 1978-11-07 1981-08-25 Toa Nenryo Kogyo Kabushiki Kaisha Coat hanger die
GB2293567A (en) * 1994-09-21 1996-04-03 Sp Tyres Uk Ltd Tyre tread extruder die and preformer cassette assembly

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4285655A (en) 1978-11-07 1981-08-25 Toa Nenryo Kogyo Kabushiki Kaisha Coat hanger die
GB2293567A (en) * 1994-09-21 1996-04-03 Sp Tyres Uk Ltd Tyre tread extruder die and preformer cassette assembly

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