WO1991013773A1 - Procede et appareil ameliores de fabrication de pneus et analogues - Google Patents

Procede et appareil ameliores de fabrication de pneus et analogues Download PDF

Info

Publication number
WO1991013773A1
WO1991013773A1 PCT/US1991/001641 US9101641W WO9113773A1 WO 1991013773 A1 WO1991013773 A1 WO 1991013773A1 US 9101641 W US9101641 W US 9101641W WO 9113773 A1 WO9113773 A1 WO 9113773A1
Authority
WO
WIPO (PCT)
Prior art keywords
mold
tire
disk
clamping plate
plate assembly
Prior art date
Application number
PCT/US1991/001641
Other languages
English (en)
Inventor
Vincent F. Panaroni
Original Assignee
Panaroni Vincent F
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 Panaroni Vincent F filed Critical Panaroni Vincent F
Publication of WO1991013773A1 publication Critical patent/WO1991013773A1/fr

Links

Classifications

    • 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
    • B29D30/02—Solid tyres ; Moulds therefor
    • 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)
    • B29D30/0679—Centrifugal casting specially adapted for tyres or parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C7/00—Non-inflatable or solid tyres
    • B60C7/10—Non-inflatable or solid tyres characterised by means for increasing resiliency
    • B60C7/101—Tyre casings enclosing a distinct core, e.g. foam
    • B60C7/1015—Tyre casings enclosing a distinct core, e.g. foam using foam material

Definitions

  • This invention relates to apparatus and method for processing polyurethane foams to form vehicle tires and the like.
  • the tire made according to the method of U.S. Patent No. 4,855,096, provides the ride and comfort of a pneumatic tire, while having greater wear-life and is not subject to puncture or blow-out.
  • Principal objects of the present invention are to provide apparatus and method for producing reinforcement banded vehicle tires from polyurethane foams that have uniformly varying density throughout the cores thereof and integral surfaces free of voids, blemishes and other defects.
  • Another object of the invention is to produce a non- pneumatic reinforcement banded tire at a cost that will allow such tire to compare favorably in the marketplace with pneumatic tires.
  • Principal features of the apparatus of the invention include a mold holder, with means to position a two-piece article forming mold thereon and a clamping plate adapted to engage the mold whereby the mold is sandwiched between the mold holder and the clamping plate.
  • the mold holder and clamping plate are mounted to rotate about a common central axis, to thereby spin the mold secured between them.
  • a drive motor is provided to drive a shaft of the mold holder to obtain the desired spinning action.
  • a resin supply head receives the components of the resinous material used to make the polyurethane foam and supplies the materials through a feed tube that passes through the clamping plate and into a clamped two-piece mold.
  • the two-piece mold has band support pins with a supported expanding reinforcement band thereon. Both the mold pieces are formed from a single master mold.
  • the mold has a central receiving passage and a distributor plate therein to receive and evenly distribute the polyurethane foam throughout the mold.
  • the method of the present invention involves a utilization of polyurethane foam mixes that are formulated such that cells of the foam when projected against the surface of a host mold will collapse as the bulk of the foam is forced into the mold and against the cells at the wall.
  • the collapsing cells form a tough, solid, outer skin for the product being molded.
  • the collapse of the cells is more rapidly developed and improved by the rotation of the mold about a central axis.
  • the rotation of the mold also results in a foamed core that is surrounded by the tough outer skin, with the core being of uniformly varying density, throughout the article produced.
  • the speed of rotation of the mold is selected to achieve a desired skin thickness and consistency for the article being molded. It is also possible to use varying speeds of rotation speeds correlated to the various stage of polymer growth so as to enhance the forming mass in the production of molded items with uniform skins that surround uniformly varying inner cores of foam.
  • the foam mixture used preferably comprise conventional polyisocyanates and polyols and water.
  • Halogenated aliphatic hydrocarbon blowing agents may also be used along with the water.
  • silicone surfactants may be used to maintain a fine uniform stable bubble for cell development.
  • Freon fluorinated hydrocarbons is added to the mix to provide for proper foaming and uniform density of the core of the product.
  • a reinforcement band system is pre-formed and is merely set in the mold to become an integral part of the formed tire.
  • Fig. 1 is a side elevation view of the apparatus of the invention with the two-piece mold shown centrally mounted on a mold plate;
  • Fig. 2 a top plan view of the apparatus
  • Fig. 3 a front elevation view
  • Fig. 4 a perspective view of the two-piece mold of the invention, with mold halves separated and a tire band system positioned to be placed in the mold;
  • Fig. 5 a sectional view through the two-piece mold
  • Fig. 6 a perspective view of a vehicle tire produced using the apparatus and method of the invention, partially cut-away to show the uniformly varying cross-section of the tire and the band system formed therein.
  • the apparatus of the invention comprises a mold holder 10, having a support base 11 and a clamping plate assembly 13.
  • a two-piece mold 14 is adapted to be positioned on a mold support base, as will be further described, and a resin supply head 15 is movably mounted to be positioned to supply resinous materials to the mold, also as will be further described.
  • Resin components and water, as well as such other additives as may be used i.e., a blowing agent, silicone surfactants and Freon are pumped from suitable reservoirs through respective supply lines 16-20 to a proportioning control valve 21 of standard construction.
  • the resin components and other additives are mixed in the valve 21 and are supplied through a nozzle 22 to the mold.
  • the nozzle 22, like the valve 21, lines 16-20 and pumps and reservoirs (not shown) are conventional and well known in the art.
  • Valve 21 is mounted on an arm 25 that swings up and down and back and forth on a articulated coupling 25a mounted to a pivoted support arm 37 to enable the valve to be easil positioned by an operator.
  • the base 11 includes ground engaging legs 26 and 27 interconnected by a rear brace 28 and upright struts 29, 30, 31, 32, and 33 that interconnect the legs 26 and 27 and rea brace 28 with a fixed support arm 34 that carries the suppor base 11 on a cantilevered end thereof.
  • the pivoted support arm 37 i addition to being pivotally connected at 38 to the uprights 3 has a flange 39 to which ends of short links 40 are pivotall connected.
  • the other ends of the short links 40 are connecte to a pivot axis 41 that has the end of a rod 42 of a hydrauli cylinder 43 pivotally connected thereto.
  • the cylinder housin 44 of cylinder 43 is pivotally connected at 44a to the end o the pivoted support arm 37 adjacent to pivot 38.
  • Long links 45 each have one end pivotally connected at 4 to a clamp 47 on the fixed support arm and another en pivotally connected to the pivot axis 41.
  • a motor 55 is carried by a bracket 56 that is fixed t the upright struts 29 and 30.
  • a belt 58 interconnects pulle 53 and a pulley 57 on the output shaft of the motor such tha operation of the motor will rotate the disk 50.
  • the clamping plate assembly 13 includes a circular disk 6 sized to conform to disk 50, and having a central projectin feed tube 61 journaled through bearings 62 in the end o pivoted arm 37.
  • a washer 63 surrounds a threaded end 64 of tube 61 and a nut 64a is threaded onto the tube to hold the disk 60 to the arm 37.
  • the disk 60 is thus mounted to rotate with the disk 50, as will be further explained.
  • the bottom of mold 14 has a recess 66 formed in the center thereof below a concave distributor chamber 72, shown in Fig. 4, as described hereinbelow, to receive a pin 66a that projects from the center of disk 50.
  • the pin 66a thus serves as a centering pin to position the mold 14 centrally between the disks 50 and 60.
  • the mold 14, shown in Fig. 4 is made of a suitable material such as polyurethane, epoxy, silicone, polyester reinforced resins, or of a metal such as aluminum, steel or the like, and is of two parts 70a and 70b.
  • the parts 70a and 70b are each separately molded in a single master mold, with the interiors of the mold halves then being mirror images, except for a receiver opening 71 that is formed through one mold half and a concave distribution chamber 72 formed in the other mold half.
  • the distribution chamber and receiver opening are merely blocked out in the master mold during formation of the parts 70a and 70b.
  • a ring 73 surrounds the receiver opening 72 inside part 70a and a similar ring 74 surrounds the distribution chamber 72.
  • passages 75 are formed through the abutting rings 73 and 74 and are aligned to receive polyurethane material spinning out of the concave distribution chamber 72.
  • a circular recess 78 is provided between each of the rings 73 and 74 as is a spaced surrounding outer wall 79 of the mold.
  • a reinforcement band or cord system shown generally at 80, may be positioned in the recess 78 as well be further described.
  • a locking hole 81 is formed in the outer wall 79 of each mold half between the ring 73 or 74 and the outer surface of the mold half.
  • a locking lug 82 is formed on the outer wall 79 of the mold diametrically opposite the locking hole 81.
  • the arm 25 and nozzle 22 are then moved to position th nozzle to discharge into and through the tubular feed tube 6 and receiver opening 71 and into the concave distributio chamber 72.
  • the resin mix supplied through nozzle 22 and into th concave distribution chamber 72 spins out through the passage 75 and into the recesses 78 to fully fill the recesses and t enrobe a band system 80 placed in the recesses.
  • the rotatio of the mold then causes the initially entering resin mix t impinge on the walls of recesses 78, and in accordance wit the process of the invention, the cells of the impingin polyurethane resin collapse against both the recess walls an the mold outer wall 79 to form a tough outer surface withou pores or voids and the cells of the subsequently enterin resin provide a foamed inner core.
  • the pores of which inne core will vary uniformly from the outer wall of recesses 78 t the center thereof with the smallest pores adjacent the oute skin and the largest pores adjacent to the recess center.
  • a pair of lamp holders 90 and 91 are shown in Fig. 1 mounted at opposite sides of pivoted support arm 37 and lamp 92 threaded into the usual sockets in the lamp holder ar directed against the disk 60.
  • the lamps are to provide necessary heat for curing the resins used in practicing the method of the invention.
  • lamp holders 93 and 94 mounted at opposite sides of the fixed support arm 34 that receive lamps 92 turned therein, provide an arrangement for directing heat from the lamps against the disk 50 to further provide necessary heat for curing the resin inside the mold 14.
  • the lamps 92 in the holders 90, 91, 93 and 94 can be separately actuated or can be actuated by operation of motor 55.
  • the part formed in the herein described mold is a solid vehicle tire.
  • the motor 55 may be a variable speed motor that can be used to selectively change the speed of rotations of the disks 50 and 60 and a mold 14 positioned between them.
  • the method of the invention is best performed using the apparatus heretofore described.
  • the usual polyurethane foam material consisting of conventional polyisocyanates and polyol in an amount sufficient to fill the mold are supplied to receiver opening 71 of the mold 14, as through the valve 21 and nozzle 22 and water is added to the mix. While it has long been believed that addition of water to a polyurethane foam will cause excessive foaming and a weak and unstable mass, it is important to the present invention that extraneous water be added to the mixture. The extraneous water serves as a reactive polyol and reacts with the polyisocyanate to create carbon dioxide gas which yields an increased expansion pressure greater than is normally experienced during processing of urethane.
  • a more dense product suitable for more uses can be produced utilizing varying rotational speeds. This is accomplished, for example, if a high speed of rotation such as four to five hundred (400-500) RPM is applied during the initial introduction of the urethane system into the mold, i.e., for a period of one to three seconds; the speed is then reduced for three to nine seconds; and is then increased again for three to nine seconds before being slowed until the cure of the formed product is complete.
  • a high speed of rotation such as four to five hundred (400-500) RPM
  • the temperatures at which the foam material is cured also affects the density and porosity of the product. It has been found that by maintaining the molds used at a temperature of between ninety degrees and one hundred ten degrees (90-110° ) Farenheit and preferably at one hundred degrees (100°F.) Farenheit the cure time will allow for proper impingement of the material onto the walls of the molds so as to form the hard, impervious outer skin and the foamed inner core. It has also been found that the controlled addition of a foaming agent, such as Freon 11 (trichloro-flouro Methane) will permit controlled changes in the size of the voids present in the foamed core.
  • a foaming agent such as Freon 11 (trichloro-flouro Methane)
  • the band system 80 shown in Fig. 4 is particularly suitable for providing reinforcement for a tire produced in the mold 14.
  • the band system includes a ring-shaped band 97 made of nylon or other suitable tire reinforcing material and having a width that is dependent on the size of the tire being produced and a plurality of elongate spacer pins 98.
  • Each spacer pin includes a bifurcated clip 99 is elongate and is formed on one end thereof to clip to a side of the band 97.
  • the band 97 includes a female receiver latch member 100 and a male receiving latch member 101 that cooperates to hold the band in a circular configuration.
  • a plurality of spacer pins 98 are spaced around the band at opposite side edges.
  • the pins extend inwardly with respect to the band and the band is made to retain its circular configuration.
  • the band system 80 is positioned in the recesses 78 whereby the band 97 will be properly located to provide the desired reinforcement for the formed tire, extending into the recesses 78, with the pins engaging the walls of the recesses in both mold halves 70a and 70b. While here shown as projecting inwardly from the band 97 it will be apparent that the pins 98 can be mounted to extend outwardly from band 97 to engage an out wall 79 of the mold 14

Landscapes

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

Abstract

Appareil et procédé de production d'articles en polyuréthane ou analogues dans lesquels un moule (14) de la forme de l'article est positionné afin de recevoir de manière centrifuge des constituants de polyuréthane de sorte que les molécules de polyuréthane heurtent et se brisent contre la paroi (79) du moule (14) afin de produire une peau extérieure lisse non poreuse (85) destinée à l'article (84), à l'aide de constituants de polyuréthane supplémentaires s'écoulant dans le moule (14) afin de produire un intérieur moussé (86) destiné à l'article (84), et pouvant entourer un système de renforcement (80) positionné dans le moule (14).
PCT/US1991/001641 1990-03-14 1991-03-11 Procede et appareil ameliores de fabrication de pneus et analogues WO1991013773A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US49334590A 1990-03-14 1990-03-14
US493,345 1990-03-14

Publications (1)

Publication Number Publication Date
WO1991013773A1 true WO1991013773A1 (fr) 1991-09-19

Family

ID=23959863

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1991/001641 WO1991013773A1 (fr) 1990-03-14 1991-03-11 Procede et appareil ameliores de fabrication de pneus et analogues

Country Status (1)

Country Link
WO (1) WO1991013773A1 (fr)

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1470048A (en) * 1920-08-11 1923-10-09 Thomas J Barker Rubber-tire core
US3200180A (en) * 1962-02-15 1965-08-10 Method op casting articles from liquid elastomers
US3348597A (en) * 1965-06-17 1967-10-24 Borg Warner Vehicle tire
US3505437A (en) * 1963-04-26 1970-04-07 Us Navy Method for rotational molding
US3605848A (en) * 1968-12-23 1971-09-20 Inter Polymer Res Corp Microcellular urethane elastomers of relatively low density
GB1285255A (en) * 1970-09-29 1972-08-16 Semperit Ag Improvements in or relating to solid tyres
US3751551A (en) * 1971-07-06 1973-08-07 Firestone Tire & Rubber Co Process of centrifugal casting
US4416841A (en) * 1981-03-11 1983-11-22 Corea John E Method for centrifugal casting of thermosetting plastics
US4436128A (en) * 1981-07-30 1984-03-13 Pointer Simon P Tires for wheels
US4519971A (en) * 1982-09-28 1985-05-28 Tekcast Industries, Inc. Front loading centrifugal spin caster
US4855096A (en) * 1986-05-23 1989-08-08 Panaroni Vincent F Method for making polyurethane tires with an outer skin
US4943223A (en) * 1986-05-23 1990-07-24 Panaroni Vincent E Apparatus for making foam products

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1470048A (en) * 1920-08-11 1923-10-09 Thomas J Barker Rubber-tire core
US3200180A (en) * 1962-02-15 1965-08-10 Method op casting articles from liquid elastomers
US3505437A (en) * 1963-04-26 1970-04-07 Us Navy Method for rotational molding
US3348597A (en) * 1965-06-17 1967-10-24 Borg Warner Vehicle tire
US3605848A (en) * 1968-12-23 1971-09-20 Inter Polymer Res Corp Microcellular urethane elastomers of relatively low density
GB1285255A (en) * 1970-09-29 1972-08-16 Semperit Ag Improvements in or relating to solid tyres
US3751551A (en) * 1971-07-06 1973-08-07 Firestone Tire & Rubber Co Process of centrifugal casting
US4416841A (en) * 1981-03-11 1983-11-22 Corea John E Method for centrifugal casting of thermosetting plastics
US4436128A (en) * 1981-07-30 1984-03-13 Pointer Simon P Tires for wheels
US4519971A (en) * 1982-09-28 1985-05-28 Tekcast Industries, Inc. Front loading centrifugal spin caster
US4855096A (en) * 1986-05-23 1989-08-08 Panaroni Vincent F Method for making polyurethane tires with an outer skin
US4943223A (en) * 1986-05-23 1990-07-24 Panaroni Vincent E Apparatus for making foam products

Similar Documents

Publication Publication Date Title
US4855096A (en) Method for making polyurethane tires with an outer skin
US4943223A (en) Apparatus for making foam products
US5906836A (en) Spin casting apparatus for manufacturing an item from polyurethane foam
US5665785A (en) Process for forming microcellular structures having an integral skin and products thereof
EP0226382B1 (fr) Pneu à noyau solide
US5551763A (en) Formed wheel tire and method
US3478134A (en) Process for the manufacture of bowling pins
US2873790A (en) Method of making pneumatic tires by casting a liquid polyester-diisocyanate composition
US3147975A (en) Bowling pin
CN206606006U (zh) 一种双密度复合高分子材料免充气轮胎
CN207015082U (zh) 一种复合高分子材料空心免充气轮胎
US6156257A (en) Reactive injection molding process for manufacturing a two-colored molded polyurethane products
US3619436A (en) Bowling pin
JPH0260521B2 (fr)
EP0030206B1 (fr) Procédé et dispositif de moulage d'un pneumatique
WO1991013773A1 (fr) Procede et appareil ameliores de fabrication de pneus et analogues
US3794706A (en) Method for building a foam-inflated tire
JPH06238669A (ja) 空気入りタイヤの加硫方法およびポストキュアインフレータ
CN1292886C (zh) 免充气轮胎的制造方法及免充气轮胎
CN209051243U (zh) 一种浇注型聚酯聚醚双材料双密度免充气轮胎
EP0429410A2 (fr) Procédé pour la fabrication, par le moulage de matières plastiques, d'un volant imitant un volant recouvert de cuir naturel
CN1076896A (zh) 发泡填充轮胎及其制法
JP2000238147A (ja) 空気入りタイヤの製造方法
CN1008159B (zh) 制造轮胎的方法和装置
CN208452710U (zh) 一种浇注型聚氨酯免充气轮胎

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): JP KP

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IT LU NL SE