GB2293567A - Tyre tread extruder die and preformer cassette assembly - Google Patents

Tyre tread extruder die and preformer cassette assembly Download PDF

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Publication number
GB2293567A
GB2293567A GB9418962A GB9418962A GB2293567A GB 2293567 A GB2293567 A GB 2293567A GB 9418962 A GB9418962 A GB 9418962A GB 9418962 A GB9418962 A GB 9418962A GB 2293567 A GB2293567 A GB 2293567A
Authority
GB
United Kingdom
Prior art keywords
preformer
plate
die
cassette
sill plate
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.)
Withdrawn
Application number
GB9418962A
Other versions
GB9418962D0 (en
Inventor
Ian Wragg
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.)
Dunlop Tyres Ltd
Original Assignee
SP Tyres UK 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 SP Tyres UK Ltd filed Critical SP Tyres UK Ltd
Priority to GB9418962A priority Critical patent/GB2293567A/en
Publication of GB9418962D0 publication Critical patent/GB9418962D0/en
Publication of GB2293567A publication Critical patent/GB2293567A/en
Withdrawn legal-status Critical Current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
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/305—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets
    • B29C48/307—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets specially adapted for bringing together components, e.g. melts within the die
    • 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
    • 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
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • 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
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/305—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2030/00—Pneumatic or solid tyres or parts thereof
    • B29L2030/002—Treads

Landscapes

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

Abstract

An extruder head assembly comprises a die plate 6, a sill plate 7 and a preformer cassette 8 wherein the die plate 6 and the sill plate 7 are held in the preformer cassette 8 which has a slot (14, Fig. 11 not shown) to guide extruded rubber directly to a die aperture 21 formed by the die plate 6 and sill plate 7. The sill plate 7 has an extruding surface 9 which is profiled so that said surface together with the profiled surface 10 of the die plate 6 define the die aperture. <IMAGE>

Description

TYRE TREAD EXTRUDER DIE AND PREFORMER CASSETTE ASSEMBLY The present invention relates to an extruder head assembly comprising a die and preformer cassette for the production of profiled rubber tread strips used in tyre manufacture.
Shown in Figures 1-6 is a conventional assembly used in conjunction with a single extruder to produce the tread strip shown in Figure 13 consisting of a single rubber compound 11. This conventional assembly comprises a die plate 1 and a sill plate 2, which together define a die aperture, and mounted on the front of a preformer cassette 3. The assembly is mounted on the discharge end of the extruder and rubber compound forwarded in the direction of arrow X' shown in Figure 2 is funnelled by a tapering slot 4 in the preformer cassette through the aperture formed by the die and sill plate assembly.
As can be seen conventionally the sill plate 2 is a plain rectangular bar of uniform cross-section and thus the entire rubber-shaping aperture of the die is formed solely in the die plate 1. The boundary between the sill plate 2 and the die plate 1 is conventionally set flush with the bottom surface 5 of the narrow slot 4 at the forward side of the preformer cassette 3.
However with the increasingly demanding service requirements of modern tyres it is becoming commonplace for tyre treads to comprise more than one rubber component in order to optimise the tyre performance. For example, a tyre tread may comprise a two-component cap/base construction as shown in Figure 14 wherein the material of the upper cap 12 is a rubber compound optimised for good road contacting properties such as grip and abrasion resistance whilst the material of the lower base 13 is a rubber optimised for low heat generation to reduce the running temperature of the tyre.
Multiple component tread strips are produced using multiple extruder arrangements. The two component cap/base tread described above for example is produced using a dual extruder system wherein two extrudates, for forming the upper cap 12 and lower base 13, from separate extruders are directed as shown in Figure 15 and upper and lower channels Y and Z respectively formed by an overlapping piece 16 inserted upstream of the preformer cassette which converge at the die assembly.
Hitherto however the maximum thickness of the lower base component of such a two component cap/base tread which was obtainable using the above-described conventional die plate and preformer cassette assembly has been 0.7mm. In view of the fact that raw tread strips for passenger vehicle tyres have thicknesses varying normally between 6-llmm dependent on size, having a maximum obtainable base thickness of only 0.7mm has proved a severe limitation in the development of multi-component tyre treads.
It is therefore an object of the present invention to provide an extruder head assembly which overcomes the above limitation.
According to the present invention there is provided an extruder head assembly which comprises a die plate, a sill plate and a preformer cassette for an extruder wherein the die plate and the sill plate are held in the preformer cassette having a slot to guide extruded rubber directly to a die aperture formed by the die plate and sill plate wherein the sill plate has an extruding surface which is profiled so that said surface together with the profiled surface of the die plate define the die aperture.
The surface of the preformer cassette slot adjacent to the sill plate may be set flush with the profiled extruding surface of the sill plate or it may be set below the said profiled extruding surface.
Further aspects of the invention will become apparent from the following description of one embodiment of the invention in conjunction with the attached drawings in which: Figure 1 shows an assembly of a conventional die plate, sill plate and preformer cassette; Figure 2 shows a section of the assembly of Figure 1 taken along line A-A; Figure 3 shows the assembly of the conventional die plate and conventional sill plate of Figure 1; Figure 4 shows a section of the assembly of Figure 3 taken along the line B-B; Figure 5 shows the conventional preformer cassette of Figure 1; Figure 6 shows a section of the conventional preformer cassette of Figure 5 taken along the line C-C; Figure 7 shows an assembly of a die plate, sill plate and preformer cassette according to the present invention;; Figure 8 shows a section of the assembly of Figure 7 taken along the line D-D; Figure 9 shows the assembly of the die plate and sill plate of Figure 7 according to the present invention; Figure 10 shows a section of the assembly of Figure 9 taken along the line E-E; Figure 11 shows the preformer cassette of Figure 7 according to the present invention; Figure 12 shows a section of the preformer cassette of Figure 11; Figure 13 shows in cross-section the profile of a single-component tread strip; Figure 14 shows in cross-section the profile of a two-component tread strip; and Figure 15 shows a schematic illustration of a preformer mounted in front of an overlapping piece and forming upper and lower channels Y and Z respectively.
Shown in Figures 7-12 are details of an extruder head assembly according to the present invention comprising a die plate 6, sill plate 7 and a preformer cassette 8. As can be seen in Figures 9 and 10 the sill plate 7 has a profiled extruding surface 9 which together with the extruding surface 10 of the die plate 6 form the die aperture 21 for shaping the rubber extrudate.
As can be seen in Figures 11 and 12 the narrow slot 14 of the preformer cassette 8 has been modified to increase its width in the vertical direction.
Accordingly as can be seen in Figure 7 in the extruder head assembly according to the present invention the lower surface 15 of the narrow slot 14 which is adjacent to the sill plate 7 is set flush with the profiled extruding surface 9 of the sill plate 7. The lower surface 15 of the narrow slot 14 may alternatively be set below the profiled extruding surface 9 of the sill plate 7.
In use the extruder head assembly of the present invention has realised up to a four-fold increase in the previously obtainable base component thicknesses with improved control and accuracy.

Claims (3)

1. An extruder head assembly comprising a die plate, a sill plate and a preformer cassette for an extruder wherein the die plate and the sill plate are held in the preformer cassette having a slot to guide extruded rubber directly to a die aperture formed by the die plate and sill plate wherein the sill plate has an extruding surface which is profiled so that said surface together with the profiled surface of the die plate define the die aperture.
2. An extruder head assembly according to claim 1, wherein a surface of the preformer cassette slot adjacent to the sill plate is set flush with the extruding surface of the sill plate.
3. An extruder head assembly according to claim 1, wherein a surface of the preformer cassette slot adjacent to the sill plate is set below the extruding surface of the sill plate.
GB9418962A 1994-09-21 1994-09-21 Tyre tread extruder die and preformer cassette assembly Withdrawn GB2293567A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9418962A GB2293567A (en) 1994-09-21 1994-09-21 Tyre tread extruder die and preformer cassette assembly

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9418962A GB2293567A (en) 1994-09-21 1994-09-21 Tyre tread extruder die and preformer cassette assembly

Publications (2)

Publication Number Publication Date
GB9418962D0 GB9418962D0 (en) 1994-11-09
GB2293567A true GB2293567A (en) 1996-04-03

Family

ID=10761636

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9418962A Withdrawn GB2293567A (en) 1994-09-21 1994-09-21 Tyre tread extruder die and preformer cassette assembly

Country Status (1)

Country Link
GB (1) GB2293567A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2308665A1 (en) * 2009-09-24 2011-04-13 Hankook Tire Co., Ltd Multiple-preformer die of extrusion mold for tire treads

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB473823A (en) * 1936-03-21 1937-10-20 Us Rubber Prod Inc Improvement in method and apparatus for extruding rubber
GB798527A (en) * 1955-04-09 1958-07-23 Pirelli Improvements relating to extrusion dies for plasticised matter
US4556376A (en) * 1983-07-11 1985-12-03 Continental Gummi-Werke Aktiengesellschaft Extruder head for producing flat cohesive profiled webs from resilient mixtures of differing composition
GB2173730A (en) * 1985-02-22 1986-10-22 Berstorff Gmbh Masch Hermann An extrusion head

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB473823A (en) * 1936-03-21 1937-10-20 Us Rubber Prod Inc Improvement in method and apparatus for extruding rubber
GB798527A (en) * 1955-04-09 1958-07-23 Pirelli Improvements relating to extrusion dies for plasticised matter
US4556376A (en) * 1983-07-11 1985-12-03 Continental Gummi-Werke Aktiengesellschaft Extruder head for producing flat cohesive profiled webs from resilient mixtures of differing composition
GB2173730A (en) * 1985-02-22 1986-10-22 Berstorff Gmbh Masch Hermann An extrusion head

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2308665A1 (en) * 2009-09-24 2011-04-13 Hankook Tire Co., Ltd Multiple-preformer die of extrusion mold for tire treads

Also Published As

Publication number Publication date
GB9418962D0 (en) 1994-11-09

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)