WO1988001927A1 - Tire mold with traceless venting - Google Patents

Tire mold with traceless venting Download PDF

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Publication number
WO1988001927A1
WO1988001927A1 PCT/IT1987/000072 IT8700072W WO8801927A1 WO 1988001927 A1 WO1988001927 A1 WO 1988001927A1 IT 8700072 W IT8700072 W IT 8700072W WO 8801927 A1 WO8801927 A1 WO 8801927A1
Authority
WO
WIPO (PCT)
Prior art keywords
mold
ribs
venting
bases
porous
Prior art date
Application number
PCT/IT1987/000072
Other languages
French (fr)
Inventor
Carmelo D'aleo
Original Assignee
Aleo Carmelo D
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 Aleo Carmelo D filed Critical Aleo Carmelo D
Publication of WO1988001927A1 publication Critical patent/WO1988001927A1/en

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
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/10—Moulds or cores; Details thereof or accessories therefor with incorporated venting means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/0601—Vulcanising tyres; Vulcanising presses for tyres
    • B29D30/0606—Vulcanising moulds not integral with vulcanising presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/0601—Vulcanising tyres; Vulcanising presses for tyres
    • B29D30/0606—Vulcanising moulds not integral with vulcanising presses
    • B29D2030/0607—Constructional features of the moulds
    • B29D2030/0614—Constructional features of the moulds porous moulds, e.g. sintered materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/0601—Vulcanising tyres; Vulcanising presses for tyres
    • B29D30/0606—Vulcanising moulds not integral with vulcanising presses
    • B29D2030/0607—Constructional features of the moulds
    • B29D2030/0617—Venting devices, e.g. vent plugs or inserts

Definitions

  • This invention refers to a tire mold with traceless venting. More particularly, the invention refers to implementation, within a tire mold, of an improved system for venting air and gas on molding, and for conveying them outside.
  • the typically grooved and carved pattern of tires' treads is obtained through the molding and curing operation, in which the raw tire is inserted in a suitable mold and subjected to som strong pressure from inside, causing it to adhere perfectly to mold, thus receiving the impression of tread and sidewalls.
  • This system is presently implemented in most various ways, by providing some thin slits or pinholes or passages of sundry types upon the inside surface of the mold, which are linked, often in a quite complex way, with the outside.
  • One solution lies in providing hundreds of small cross throug channels, in the base of the protruding ribs forming the pattern to be impressed on tread. Through said small channels communication is ob ⁇ tained among the different air pockets formed between one rib and an ⁇ other, on curing. Besides, several pinholes are provided, passing throu the mold and allowing to vent the air outside.
  • said pinho- les are made by holes of, for instance, 2.5 mm. diameter in which, in order to reduce their cross section, as many bushes are introduced, having an inside diameter of about 0.75 mm.
  • the extremely reduced dimension of openings provided on mold 5 should allow the air venting without any penetration of rubber; how ⁇ ever, in practice, rubber enters all the same and finished tires show a series of small, protruding tubular appendices, corresponding to mold's canalizations.
  • the so-called “spaghetti venting” is made use " of, which consists in providing very thin, continuous longitudinal grooves along the base of both sidewalls of the ribs, where the latter are connected with the bottom of the mold. Several through pinholes, communicating with the outside, are provided in said grooves. Air there ⁇ fore gathers in said small channels and is vented outside through pinho- 30 les. Even in this case the solution is no ⁇ marginally costly, ab all because grooves, owing to precision required, should be hand mad
  • the relief parts of the mold all or part of them, from a porous metallic material, securing them rigidly to the mold, not necessarily in a way allowing disassembly, and connecting them, at their bases, with a sys tern of channels passing through the mold and in communication with th outside.
  • Air can therefore be vented from mold by passing through por of the material, without any presence of pinholes or slits on inside surface. Any shortcoming relating to manufacturing difficulties or to traces on molded tire, as caused by pinholes or slits, is therefore avoided.
  • the present invention specifically relates to a tire mold with traceless venting, showing a series of relief ribs, correspond ⁇ ing to pattern to be impressed on tread on molding and curing, char- acterized in that at least a part of said ribs are made from a porous metallic material, suitable for air and gas venting, and are rigidly se cured to mold at their bases, and in that there is provided a plurality of channels linking said bases with the outside, through the mold body, for venting the air expelled through said porous ribs on molding.
  • said porous material is sintered stainless steel, for instance AISI 304/316 steel, whose pores have an average dimension between 5 im and 50 ,um, while porosity varies between 25 % and 40 %.
  • pores have an average dimension of 15 p , while porosity equals 25 %.
  • ribs are inserted with their bases into suitable grooves provided on its bottom, and they are se ⁇ cured by welding; in case of aluminium alloy molds, on the contrary, the ribs can be embodied with their bases merged into the mold, direc ⁇ tly upon molding by fusion of mold itself.
  • ribs are secured to mold through screws or bolts, being anyway inserted with their bases within suitable grooves in the mold; said solution allows the disassembly of elements, in order to replace them whenever required.
  • the mold according to this invention in its various embodiments, is more simply and cheaply manufactured than those of known techniques. Besides, even in case that grooves are provided within the base mold, it is not required any high precision and in no case the surfaces to be matched show any multiple or complex curving.
  • the one according to this invention has the advantage of leaving no trace on tire, while providing a surface available for venting which is quite greater.
  • porous zones can be advantage- ously limited to transversal ribs only: in such a way each of the sep ⁇ arated air pockets formed during molding is in contact with at least two porous zones.
  • the different types of segments to be made from porous material are less than for the peripheral ribs, thus allowing a greater standardization of mold manufacture as well as a reduction of tooling costs.
  • Porosity is selected in such a way that rubber cannot enter the pores, and therefore the material is not jammed inside, even if some of it can stick on the outside surface, like on the whole remaind of mold.
  • surface cleaning it is only required to operate according to known methods, for instance by blasting of beads, or by using chemical agents, or else by adopting this latter cleaning once in a while, among more frequent blasting operations.
  • figure 1 shows a cross sectional view of a first embodiment of the mold according to the invention
  • figure 2 shows a cross sectional view of a second embodiment.
  • figure 1 there is shown one section of a segmented mold for tires, formed by a main body 1, made, for instance, from aluminium alloy.
  • ribs 2 are inserted, up to some length, into body 1 of the mold, while they are joined to the outside, at their bases 4, through channels 5. The same happens for cross ribs 3 (not shown).
  • FIG 2 there is shown a tread crown 6 of a two-halved tire mold, where longitudinal and cross ribs, their bases and channels are shown by same numerals as in figure 1.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

Tire mold with traceless venting, showing a set of relief ribs (2, 3), corresponding to pattern to be impressed on tread on molding and curing, in which at least a part of said ribs are made from a porous metallic material, suitable for air and gas venting, and are rigidly secured to mold (6) at their bases (4), and in which there is provided a plurality of channels (5) linking said bases (4) with the outside, through the mold body, for venting the air expelled through said porous ribs (2, 3) on molding.

Description

TIRE MOLD WITH TRACELESS VENTING
This invention refers to a tire mold with traceless venting. More particularly, the invention refers to implementation, within a tire mold, of an improved system for venting air and gas on molding, and for conveying them outside.
As already known, the typically grooved and carved pattern of tires' treads is obtained through the molding and curing operation, in which the raw tire is inserted in a suitable mold and subjected to som strong pressure from inside, causing it to adhere perfectly to mold, thus receiving the impression of tread and sidewalls.
In order to correctly carry outsaid operation it is required that any air initially contained within the mold be not trapped betwee the latter and the rubber upon molding, and therefore some venting sys tem is to be provided allowing its expulsion, without however letting the rubber itself to escape.
This system is presently implemented in most various ways, by providing some thin slits or pinholes or passages of sundry types upon the inside surface of the mold, which are linked, often in a quite complex way, with the outside.
One solution lies in providing hundreds of small cross throug channels, in the base of the protruding ribs forming the pattern to be impressed on tread. Through said small channels communication is ob¬ tained among the different air pockets formed between one rib and an¬ other, on curing. Besides, several pinholes are provided, passing throu the mold and allowing to vent the air outside. In practice, said pinho- les are made by holes of, for instance, 2.5 mm. diameter in which, in order to reduce their cross section, as many bushes are introduced, having an inside diameter of about 0.75 mm.
The extremely reduced dimension of openings provided on mold 5 should allow the air venting without any penetration of rubber; how¬ ever, in practice, rubber enters all the same and finished tires show a series of small, protruding tubular appendices, corresponding to mold's canalizations.
Besides, it clearly appears how much this system is complex
10 and costly to carry out: before all, the dimensioning and localization of small channels call for long and complicated study, and, besides, the implementation itself of mold results to be quite delicate and costly.
Another solution is that of making the mold in several thin *5 transversal segments, placed side by side, so that air might escape from it through the slits among said segments. However, this implemen¬ tation calls for extreme precision in machining the segments, which are to be mutually approached to make up the mold, thus perfectly matching.
Actually, should slits among segments be too wide, rubber could
20 pass through them, thus forming some cross flashes on tread's surface. Such difficulty, however, cannot be completely eliminated and tires ob¬ tained by this method show anyway some traces in correspondence with mold's slits.
Alternatively, the so-called "spaghetti venting" is made use " of, which consists in providing very thin, continuous longitudinal grooves along the base of both sidewalls of the ribs, where the latter are connected with the bottom of the mold. Several through pinholes, communicating with the outside, are provided in said grooves. Air there¬ fore gathers in said small channels and is vented outside through pinho- 30 les. Even in this case the solution is noπ marginally costly, ab all because grooves, owing to precision required, should be hand mad
There are difficulties also in the solution by which ribs a formed by parts separated from basic mold and secured to same throug bolts; under the rib's base there is provided, on the mold, a contin ous central groove, and air, when entering the slit between the rib's base and the mold surface, gathers in said groove and is vented outsi through suitable canalizations. In this case there is first of all th problem of dissimulating the traces of bolts from rib's top and, besi the coupling between latter and the mold is to be provided with extre precision, still to avoid that too wide slits be formed. This is spec ly difficult mostly owing to the fact that mold shows a twin curving, peripheral and cross senses.
It appears that such multiplicity of solutions presently ado ted for air venting in curing tires, shows how none of them has been ticularly successful by economy or quality of product.
It is therefore an object of this invention to provide a tir mold allowing the air venting without giving way to traces on molded product surface and being at the same time easy and cheap to manufac- ture.
According to the invention, there is proposed to make the relief parts of the mold, all or part of them, from a porous metallic material, securing them rigidly to the mold, not necessarily in a way allowing disassembly, and connecting them, at their bases, with a sys tern of channels passing through the mold and in communication with th outside. Air can therefore be vented from mold by passing through por of the material, without any presence of pinholes or slits on inside surface. Any shortcoming relating to manufacturing difficulties or to traces on molded tire, as caused by pinholes or slits, is therefore avoided. The present invention specifically relates to a tire mold with traceless venting, showing a series of relief ribs, correspond¬ ing to pattern to be impressed on tread on molding and curing, char- acterized in that at least a part of said ribs are made from a porous metallic material, suitable for air and gas venting, and are rigidly se cured to mold at their bases, and in that there is provided a plurality of channels linking said bases with the outside, through the mold body, for venting the air expelled through said porous ribs on molding.
Preferably said porous material is sintered stainless steel, for instance AISI 304/316 steel, whose pores have an average dimension between 5 im and 50 ,um, while porosity varies between 25 % and 40 %.
In particular, according to a preferred embodiment, pores have an average dimension of 15 p , while porosity equals 25 %.
When the mold is a steel one, ribs are inserted with their bases into suitable grooves provided on its bottom, and they are se¬ cured by welding; in case of aluminium alloy molds, on the contrary, the ribs can be embodied with their bases merged into the mold, direc¬ tly upon molding by fusion of mold itself.
According to a further embodiment, ribs are secured to mold through screws or bolts, being anyway inserted with their bases within suitable grooves in the mold; said solution allows the disassembly of elements, in order to replace them whenever required.
It clearly appears that the mold according to this invention, in its various embodiments, is more simply and cheaply manufactured than those of known techniques. Besides, even in case that grooves are provided within the base mold, it is not required any high precision and in no case the surfaces to be matched show any multiple or complex curving.
Compared to the venting systems including various types of pinholes and small channels, the one according to this invention has the advantage of leaving no trace on tire, while providing a surface available for venting which is quite greater.
Besides, it is not required that all projections be made from porous material; for instance the porous zones can be advantage- ously limited to transversal ribs only: in such a way each of the sep¬ arated air pockets formed during molding is in contact with at least two porous zones. In this way, the different types of segments to be made from porous material are less than for the peripheral ribs, thus allowing a greater standardization of mold manufacture as well as a reduction of tooling costs.
Porosity is selected in such a way that rubber cannot enter the pores, and therefore the material is not jammed inside, even if some of it can stick on the outside surface, like on the whole remaind of mold. Whenever surface cleaning is needed, it is only required to operate according to known methods, for instance by blasting of beads, or by using chemical agents, or else by adopting this latter cleaning once in a while, among more frequent blasting operations.
The invention will be now described, for illustrative and not limitative purposes, with reference to figures of the enclosed drawing in which: figure 1 shows a cross sectional view of a first embodiment of the mold according to the invention; and figure 2 shows a cross sectional view of a second embodiment. in figure 1 there is shown one section of a segmented mold for tires, formed by a main body 1, made, for instance, from aluminium alloy.
Longitudinal ribs 2, made from sintered steel, are shown in cross section, while by 3 a porous transversal rib is shown in lateral view.
As it can be remarked, ribs 2 are inserted, up to some length, into body 1 of the mold, while they are joined to the outside, at their bases 4, through channels 5. The same happens for cross ribs 3 (not shown).
The coupling of the ribs to the mold in the embodiment shown is provided, as already stated, by burying the porous steel elements in the aluminium mass upon fusion molding.
According to this solution all ribs shown are made from porous material, but is is to be understood that this could be limited, for instance, only to the cross ones.
In figure 2 there is shown a tread crown 6 of a two-halved tire mold, where longitudinal and cross ribs, their bases and channels are shown by same numerals as in figure 1.
This invention has been described with special reference to some of its preferred embodiments, but is to be understood that modifi¬ cations and changes might be made by those skilled in the art without departing from its gneral scope.

Claims

1. Tire mold with traceless venting, showing a set of relief ribs, corresponding to pattern to be impressed on tread upon molding and curing, characterized in that at least a part of said ribs are made from a porous metallic material, suitable for air and gas venting and are rigidly secured to mold attheir bases, and in that there is pro¬ vided a plurality of channels linking said bases with the outside, through the mold body, for venting the air expelled through said po¬ rous ribs on molding.
2. Tire mold according to claim 1 in which said porous metal¬ lic material is sintered stainless steel.
3. Tire mold according to claim 2 in which pores of said stee have an average dimension between 5 μ and 50 um.
4. Tire mold according to claim 3 in which porosity of said steel varies between 25 % and 40 %.
5. Tire mold according to claim 4 in which said pores have a average dimension of 15 μm while said porosity equals 25 %.
6. Tire mold according to any of claims 1-5 in which said mol is made from steel and said porous ribs are inserted with their bases into suitable grooves provided on mold bottom and are secured by weld¬ ing.
7. Mold according to any of claims 1-5 in which said mold is made from aluminium alloy and said porous ribs are embodied with their bases merged into the mold directly on fusion molding of same.
8. Mold according to any of claims 1-5 in which said porous ribs are inserted with their bases into suitable grooves provided on mold boto and are secured through screws or bolts.
9. Tire mold according to any of previous claims in which cro ribs only are made from said porous metallic material.
10. Tire mold with traceless venting according to claim 1-9 substantially as previously described and shown.
PCT/IT1987/000072 1986-09-22 1987-07-16 Tire mold with traceless venting WO1988001927A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT48481A/86 1986-09-22
IT8648481A IT8648481A0 (en) 1986-09-22 1986-09-22 TRACELESS AIR BLEED TIRE MOLD

Publications (1)

Publication Number Publication Date
WO1988001927A1 true WO1988001927A1 (en) 1988-03-24

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Application Number Title Priority Date Filing Date
PCT/IT1987/000072 WO1988001927A1 (en) 1986-09-22 1987-07-16 Tire mold with traceless venting

Country Status (3)

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AU (1) AU7705187A (en)
IT (1) IT8648481A0 (en)
WO (1) WO1988001927A1 (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992015439A1 (en) * 1991-03-05 1992-09-17 Toolvac Engineering Ab Method for tempering a moulding tool
EP0591745A2 (en) * 1992-10-07 1994-04-13 Compagnie Generale Des Etablissements Michelin-Michelin & Cie Tyre mould and method for moulding tyres
EP0818290A2 (en) * 1996-07-10 1998-01-14 Bridgestone Corporation Mold for tyre vulcanization and manufacturing method thereof
JPH10244540A (en) * 1997-01-29 1998-09-14 Pirelli Coordinamento Pneumatici Spa Production of vulcanizing mold of tire for vehicle, vulcanizing mold, and tire produced therewith
US6592807B2 (en) * 2001-05-24 2003-07-15 The Goodyear Tire And Rubber Company Method of making a porous tire tread mold
EP1652644A1 (en) * 2004-10-30 2006-05-03 Continental Aktiengesellschaft Tire mould with a contoured forming surface made of sintered material
WO2008028542A1 (en) * 2006-09-08 2008-03-13 Continental Aktiengesellschaft Method of producing a vulcanizing mould with a number of profile segments that can be joined together to form a circumferentially closed mould, and vulcanizing mould
US7384252B2 (en) * 2002-11-01 2008-06-10 Kabushiki Kaisha Bridgestone Method for producing tire vulcanizing mold and tire vulcanizing mold
US7524175B2 (en) 2004-12-22 2009-04-28 The Goodyear Tire & Rubber Company Method and apparatus to vent a mold
EP2669078A1 (en) * 2012-05-29 2013-12-04 Sumitomo Rubber Industries, Ltd. Tire vulcanization mold and method for manufacturing tire
KR101360904B1 (en) 2012-03-26 2014-02-12 주식회사 엠케이테크놀로지 When Thai Garyu process sikchulgomuui mold to prevent the creation of Thai garyuyong
FR3009993A1 (en) * 2013-09-05 2015-03-06 Peugeot Citroen Automobiles Sa DEVICE FOR MOLDING AN EXPANDED POLYSTYRENE PIECE
DE102014215866A1 (en) 2014-08-11 2016-02-11 Continental Reifen Deutschland Gmbh Method for producing a vulcanization tool
US10814573B2 (en) 2017-07-20 2020-10-27 Bridgestone Americas Tire Operations, Llc Bead ring design improvement

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB664730A (en) * 1948-07-20 1952-01-09 Pirelli Improvements relating to the manufacture of moulded articles composed of a plastic, for example elastic rubber
GB840883A (en) * 1956-02-25 1960-07-13 Dunlop Rubber Co Improvements in or relating to moulds
US4436497A (en) * 1982-10-27 1984-03-13 The Goodyear Tire & Rubber Company Mold and vent plug therefor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB664730A (en) * 1948-07-20 1952-01-09 Pirelli Improvements relating to the manufacture of moulded articles composed of a plastic, for example elastic rubber
GB840883A (en) * 1956-02-25 1960-07-13 Dunlop Rubber Co Improvements in or relating to moulds
US4436497A (en) * 1982-10-27 1984-03-13 The Goodyear Tire & Rubber Company Mold and vent plug therefor

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992015439A1 (en) * 1991-03-05 1992-09-17 Toolvac Engineering Ab Method for tempering a moulding tool
EP0591745A2 (en) * 1992-10-07 1994-04-13 Compagnie Generale Des Etablissements Michelin-Michelin & Cie Tyre mould and method for moulding tyres
EP0591745A3 (en) * 1992-10-07 1994-10-12 Michelin & Cie Tyre mould and method for moulding tyres.
EP0818290A2 (en) * 1996-07-10 1998-01-14 Bridgestone Corporation Mold for tyre vulcanization and manufacturing method thereof
EP0818290A3 (en) * 1996-07-10 1998-12-02 Bridgestone Corporation Mold for tyre vulcanization and manufacturing method thereof
JPH10244540A (en) * 1997-01-29 1998-09-14 Pirelli Coordinamento Pneumatici Spa Production of vulcanizing mold of tire for vehicle, vulcanizing mold, and tire produced therewith
EP0868955A1 (en) * 1997-01-29 1998-10-07 PIRELLI COORDINAMENTO PNEUMATICI S.p.A. Method of producing tyres, of making vulcanization moulds for said tyres, tyres and moulds thus produced
US6592807B2 (en) * 2001-05-24 2003-07-15 The Goodyear Tire And Rubber Company Method of making a porous tire tread mold
US7384252B2 (en) * 2002-11-01 2008-06-10 Kabushiki Kaisha Bridgestone Method for producing tire vulcanizing mold and tire vulcanizing mold
EP1652644A1 (en) * 2004-10-30 2006-05-03 Continental Aktiengesellschaft Tire mould with a contoured forming surface made of sintered material
US7524175B2 (en) 2004-12-22 2009-04-28 The Goodyear Tire & Rubber Company Method and apparatus to vent a mold
WO2008028542A1 (en) * 2006-09-08 2008-03-13 Continental Aktiengesellschaft Method of producing a vulcanizing mould with a number of profile segments that can be joined together to form a circumferentially closed mould, and vulcanizing mould
KR101360904B1 (en) 2012-03-26 2014-02-12 주식회사 엠케이테크놀로지 When Thai Garyu process sikchulgomuui mold to prevent the creation of Thai garyuyong
EP2669078A1 (en) * 2012-05-29 2013-12-04 Sumitomo Rubber Industries, Ltd. Tire vulcanization mold and method for manufacturing tire
US8757995B2 (en) 2012-05-29 2014-06-24 Sumitomo Rubber Industries, Ltd. Tire vulcanization mold
FR3009993A1 (en) * 2013-09-05 2015-03-06 Peugeot Citroen Automobiles Sa DEVICE FOR MOLDING AN EXPANDED POLYSTYRENE PIECE
DE102014215866A1 (en) 2014-08-11 2016-02-11 Continental Reifen Deutschland Gmbh Method for producing a vulcanization tool
US10814573B2 (en) 2017-07-20 2020-10-27 Bridgestone Americas Tire Operations, Llc Bead ring design improvement

Also Published As

Publication number Publication date
IT8648481A0 (en) 1986-09-22
AU7705187A (en) 1988-04-07

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