WO1997012930A1 - Element de rembourrage dote de cellules remplies de gaz d'absorption des chocs - Google Patents
Element de rembourrage dote de cellules remplies de gaz d'absorption des chocs Download PDFInfo
- Publication number
- WO1997012930A1 WO1997012930A1 PCT/SE1996/001195 SE9601195W WO9712930A1 WO 1997012930 A1 WO1997012930 A1 WO 1997012930A1 SE 9601195 W SE9601195 W SE 9601195W WO 9712930 A1 WO9712930 A1 WO 9712930A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- microspheres
- matrix
- moulded
- padding
- styrene
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
- B60R21/04—Padded linings for the vehicle interior ; Energy absorbing structures associated with padded or non-padded linings
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0013—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor using fillers dispersed in the moulding material, e.g. metal particles
-
- 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
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/58—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising fillers only, e.g. particles, powder, beads, flakes, spheres
- B29C70/66—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising fillers only, e.g. particles, powder, beads, flakes, spheres the filler comprising hollow constituents, e.g. syntactic foam
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
- B60R21/04—Padded linings for the vehicle interior ; Energy absorbing structures associated with padded or non-padded linings
- B60R21/05—Padded linings for the vehicle interior ; Energy absorbing structures associated with padded or non-padded linings associated with the steering wheel, steering hand lever or steering column
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
- B29K2105/16—Fillers
- B29K2105/165—Hollow fillers, e.g. microballoons or expanded particles
-
- 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
- B29L2031/00—Other particular articles
- B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
- B29L2031/3005—Body finishings
- B29L2031/3008—Instrument panels
-
- 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
- B29L2031/00—Other particular articles
- B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
- B29L2031/3005—Body finishings
- B29L2031/3035—Sun visors
-
- 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
- B29L2031/00—Other particular articles
- B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
- B29L2031/3047—Steering wheels
Definitions
- the PRESENT INVENTION relates to a padding element and to a method of manufacturing a padding element for an interior component in a motor vehicle.
- the padding element may comprise a dash-board cover, which may incorporate an air ⁇ bag cover, a padding element for a pillar, such as a B- pillar, and, in particular, the outer part of a steering wheel.
- the padding element may comprise a knee protection pad, sun visor gear lever knob or arm-rest.
- Interior components of vehicles such as motor cars, which are positioned such that an occupant of the vehicle may hit them during an accident, are often made of a plastic material, or are at least covered with such a material.
- Typical materials are polyurethane foam, soft polyvinyl chloride, expanded polyvinyl chloride, or expanded polypropylene.
- a solid thermoelasto er is used.
- a thermoelastomer is a thermoplastic material which has elastic properties (i.e. if it is stretched so that one dimension is increased by up to 100%, it returns to its original shape) .
- a typical steering wheel for use in a motor vehicle comprises a metal frame defining the rim of the steering wheel and one or more spokes extending from the rim towards a hub.
- the metal frame is covered with a padding element.
- a polyurethane foam as the principal part of a padding element which is moulded to the metal frame of a steering wheel.
- Such polyurethane foam has also been proposed for use as a padding element for a dashboard cover, that may incorporate an air-bag, and as a padding element for a pillar, such as a B-pillar.
- a polyurethane foam is made from a liquid polyurethane material where gas "bubbles” (closed gas cells) are generated by a chemical foam agent.
- the material may be moulded to form an appropriate padding element, but it has been found that this leads to a substantial amount of “flashing” with the liquid material flowing from the mould cavity between the two mould parts. “Flashing”, when it occurs in this context, has to be cut off from the steering wheel. This is labour-intensive. Polyurethane is also difficult to recycle, and leads to a long production time due to long time for curing.
- thermoplastic material can easily be recycled, but prior attempts to utilise a foamed thermoplastic material forming a padding element, for example for use as part of a steering wheel, have not proved to be very successful. If a foam agent is introduced late so that the gas cells are generated mainly in the mould more and larger cells will be created in the centre of the mould because close to the surface the plastic material will be cooled very quickly. This will result in a very thick "skin” and a fairly high average density. On the other hand if the foam agent is introduced at an early stage the gas cells will reach the surface where they will "burst" creating a rough structure of the surface.
- the present invention seeks to provide an improved padding element and a new method of manufacturing a padding element.
- a method of manufacturing a padding element for an interior component of a motor vehicle comprising the step of moulding the padding element from a mixture of microspheres and a plasticised thermoplastic or thermoelastomer material, the microspheres being formed of a plastic or polymer material.
- the moulding comprises injection moulding.
- microspheres are added to the matrix material after it has been plasticised.
- microspheres are added to the matrix material in a plasticiser in which the matrix material is plasticised.
- microspheres are added to the matrix material in a mixer prior to the matrix material being plasticised.
- microspheres are added to the matrix granules in a quantity of between 2 and 5%, most preferably substantially 3% by weight based on the weight of the matrix material.
- plastic material forming the microspheres is a different material to the material of the matrix.
- the melting point of the material forming the microspheres is higher than the melting point of the material of the matrix. This is however not necessary because the microspheres are cooled by the expansion.
- thermoelastomer material is utilised, such as a matrix material, being based on styrene, ester, urethane, amide or olefin.
- the thermoelastomer material is an styrene-ethylene-butane- styrene material or a styrene-ethylene-propylene-styrene.
- the padding element is moulded on to the component.
- the component may comprise a steering wheel, a dashboard, a pillar, such as a B-pillar, an air ⁇ bag cover, knee protection pad, sun visor, gear lever knob or arm-rest.
- the invention also relates to a padding element formed by a method as described above.
- a padding element for an interior component of a motor vehicle comprising a moulded element, the element being moulded from a matrix of thermoplastic material, the element having, within the matrix material a plurality of closed gas filled cells, each cell being bounded by a material which is different from the material of the matrix.
- each "bubble" or cell is approximately 100 - 150 microns.
- the volume contained within the said bubbles comprises between 30 and 60% of the total volume of the said element.
- the element has an unfoamed skin adjacent its surface having a thickness of the order of tenths of a millimetre.
- the element may be in the form of an element moulded to the core of a steering wheel, or a dashboard, knee protection pad, sun visor, gear lever knob or arm ⁇ rest, or alternatively, a pillar such as a B-pillar.
- FIGURE 1 is a block diagram of a method for making a padding element
- FIGURE 2 is a perspective view of a steering wheel incorporating a padding element
- FIGURE 3 is a sectional view taken on the line III- III of Figure 2.
- thermoplastic granules 1 Suitable non-elastomer thermoplastic materials may comprise polyolefins, or polyvinyl chloride. Suitable thermoelastomer materials are based on styrene, esters, urethanes, amides or olefins. The preferred thermoplastic materials are styrene-ethylene-butane-styrene or styrene- ethylene-propylene-styrene.
- thermoplastic granules 1 may optionally be passed to a mixer 2.
- the granules may be mixed with an appropriate dye 3, if the granules are not already coloured.
- the granules subsequently passed to a plasticiser 4.
- the plasticiser the granules are heated until the material is liquid or has a suitable consistency for injection moulding.
- the thermoplastic or material may have a high temperature approaching 200°C.
- the material is then passed from the plasticiser 3 to an injection moulding apparatus 5.
- a source 6 of microspheres is provided.
- the microspheres are preferably spheres of a copolymer based on polyacrilonitrile and with an unexpanded diameter of 30 to 40 microns, the spheres having a hollow centre, which contains liquified isoprene or isopentane. When heated, the spheres expand to 120 - 140 microns as the isopentane is gasified. Microspheres of this type are commercially available.
- microspheres for use in connection with the present invention could be formed from a plastics material which has a melting point which is higher than the melting point of the thermoplastic granules 1.
- the microspheres 5 are added to the thermoplastic granules l.
- the microspheres are added to the thermoplastic or thermoelastomer granules in a quantity of between 2 and 5%, preferably 3%, by weight based on the weight of the thermoplastic material.
- the microspheres 6 may be added to the thermoplastic granules 1 in the mixer 2, or, alternatively, may be added to the granules when in the plasticiser 4. However, it is preferred that the microspheres be added to the plasticised thermoplastic or thermoelasto eric material as the material from the plasticiser 4 is introduced into the injection moulding tool 5.
- the polymer material forming the microspheres When exposed to the relatively high temperature of the plasticised thermoplastic or thermoelastomer granules as they are introduced into the injection moulding apparatus 5, the polymer material forming the microspheres is softened and the liquified gas within the microspheres is heated to a temperature approaching that of the plasticised thermoplastic material. The liquified gas within the microspheres thus expands substantially as it is gasified.
- the injection moulded elements are found to comprise a foam-like material.
- the gas spaces within the foam may comprise between 30 and 60% by volume.
- the density can decrease from about 0.9 kg/m 3 for the unfoamed material to about 0.6- 0.4 kg/m 3 for the foamed material.
- the cellular structure of the foamed material is fine and very homogenous, as compared with the prior proposed foamed materials discussed above.
- the individual cells have a diameter of approximately 100 - 150 microns.
- a thin unfoamed skin some tenths of a millimetre thick at the outer surface of the moulded element.
- FIG 2 illustrates a steering wheel comprising a rim 10 associated with spokes 11 and a central hub 12.
- the steering wheel has been formed by utilising the method described with reference to Figure 1 to mould a padding element comprising a foamed thermoplastic material on to a metal frame.
- Figure 3 illustrates a sectional view of part of the rim 10.
- the metal frame 13 is clearly visible, being of circular section.
- the frame is surrounded by a padding element comprising a foamed material 14.
- the foamed material comprises the thermoplastic 15 as initially utilised, together with a plurality of individual cells 16 which are typically of 100 - 150 micron size in diameter. Each cell 16 is bounded by a thin layer 17 of the material forming the microspheres utilised.
- the skin 18 provides the steering wheel with a comfortable "feel", although, if desired, an additional non-foamed skin could be added on to the exterior of the thin skin 18 discussed above.
- the padding has good energy-absorbing properties.
- the individual cells defined by the microspheres will collapse if subjected to a sufficiently high load, providing an energy-absorbing effect.
- flashing Only a minimum of "flashing" occurs, meaning that a minimum of time must be spent in de-flashing. Any material removed during flashing can be recycled.
- the cycle time for the moulding process is relatively short. As the gas present in the microspheres expands, it provides a cooling effect, thus meaning that the mould can be opened relatively swiftly after the injection process has been completed.
- the moulding process is found to be "repeatable" in that the product is produced in a consistent manner. There is only a very low reject rate due to blisters and other surface defects.
- the material utilised being a thermoplastic material, can be recycled, and consequently the material forming any faulty products may be recycled immediately. The material may be recycled at the end of the life of a motor vehicle.
- the invention has been described with reference to a method of forming a padding element that forms an integral part of a steering wheel, it is to be understood that the invention relates to other padding elements for interior components of motor vehicles including dash-boards, pillars, such as B-pillars, air-bag covers, knee protection pads, sun visors, gear lever knobs, arm rests etc.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Dispersion Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Air Bags (AREA)
- Steering Controls (AREA)
Abstract
Un élément de rembourrage (14) destiné à être utilisé dans un véhicule peut comprendre un article tel qu'un rembourrage pour tableau de bord, un pare-soleil ou analogue, mais constitue de préférence la partie extérieure d'un volant (10). L'élément (14) est moulé par injection en une matière thermoplastique plastifiée (15) présentant des microsphères (16), les microsphères étant constituées d'une matière plastique. Les microsphères se dilatent afin de transformer la matière moulée en une 'mousse'. Les cellules individuelles de la mousse sont entourées de la matière (17) constituant les microsphères. Le procédé permet de réduire au minimum la formation de 'bavures'. La matière thermoplastique peut être recyclée lorsque le véhicule est mis à la casse au terme de sa vie utile.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19681577T DE19681577T1 (de) | 1995-10-05 | 1996-09-25 | Polsterelement mit gasgefüllten Zellen zur Stoßdämpfung |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9520351A GB2305885B (en) | 1995-10-05 | 1995-10-05 | Improvements in or relating to a padding element |
GB9520351.9 | 1995-10-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997012930A1 true WO1997012930A1 (fr) | 1997-04-10 |
Family
ID=10781822
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1996/001195 WO1997012930A1 (fr) | 1995-10-05 | 1996-09-25 | Element de rembourrage dote de cellules remplies de gaz d'absorption des chocs |
Country Status (3)
Country | Link |
---|---|
DE (1) | DE19681577T1 (fr) |
GB (1) | GB2305885B (fr) |
WO (1) | WO1997012930A1 (fr) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6451865B1 (en) | 1997-10-31 | 2002-09-17 | Kraton Polymers U.S. Llc | Foam composition comprising oil, thermoplastic elastomer and expandable particles |
EP1285839A2 (fr) | 2001-08-20 | 2003-02-26 | Trw Vehicle Safety Systems Inc. | Volant de direction élastomère polyoléfinique thermoplastique |
EP1413426A1 (fr) | 2002-10-22 | 2004-04-28 | Trw Vehicle Safety Systems, Inc. | Volant enveloppé sans interface adhésive |
WO2014011744A3 (fr) * | 2012-07-10 | 2014-04-17 | Adhesive T Echnologies, Inc. | Procédé et appareil pour la modification de compositions de polymère |
JP2015027737A (ja) * | 2013-07-30 | 2015-02-12 | 松本油脂製薬株式会社 | 把持部品 |
CN106808638A (zh) * | 2015-11-27 | 2017-06-09 | 法国圣戈班玻璃公司 | 注塑件及其形成方法、包边结构以及车窗 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006031546A1 (de) * | 2006-07-07 | 2008-01-10 | Trw Automotive Safety Systems Gmbh | Lenkrad |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5244613A (en) * | 1993-01-21 | 1993-09-14 | Miles Inc. | Process for the production of reinforced moldings and the resultant products |
US5418257A (en) * | 1993-04-08 | 1995-05-23 | Weisman; Morey | Modified low-density polyurethane foam body |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3216966C2 (de) * | 1982-05-06 | 1986-04-10 | Secans AG, Zug | Verfahren zur Herstellung einer elastischen Formsohle |
US4811402A (en) * | 1986-11-13 | 1989-03-07 | Epic Corporation | Method and apparatus for reducing acoustical distortion |
-
1995
- 1995-10-05 GB GB9520351A patent/GB2305885B/en not_active Expired - Fee Related
-
1996
- 1996-09-25 DE DE19681577T patent/DE19681577T1/de not_active Withdrawn
- 1996-09-25 WO PCT/SE1996/001195 patent/WO1997012930A1/fr active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5244613A (en) * | 1993-01-21 | 1993-09-14 | Miles Inc. | Process for the production of reinforced moldings and the resultant products |
US5418257A (en) * | 1993-04-08 | 1995-05-23 | Weisman; Morey | Modified low-density polyurethane foam body |
Non-Patent Citations (1)
Title |
---|
DERWENT'S ABSTRACT, No. 92-222608/27, Week 9227; & JP,A,04 146 941, (KANTO SEIKI CO LTD), 20-05-92. * |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6451865B1 (en) | 1997-10-31 | 2002-09-17 | Kraton Polymers U.S. Llc | Foam composition comprising oil, thermoplastic elastomer and expandable particles |
EP1285839A2 (fr) | 2001-08-20 | 2003-02-26 | Trw Vehicle Safety Systems Inc. | Volant de direction élastomère polyoléfinique thermoplastique |
EP1285839A3 (fr) * | 2001-08-20 | 2004-02-04 | Trw Vehicle Safety Systems Inc. | Volant de direction élastomère polyoléfinique thermoplastique |
EP1413426A1 (fr) | 2002-10-22 | 2004-04-28 | Trw Vehicle Safety Systems, Inc. | Volant enveloppé sans interface adhésive |
WO2014011744A3 (fr) * | 2012-07-10 | 2014-04-17 | Adhesive T Echnologies, Inc. | Procédé et appareil pour la modification de compositions de polymère |
JP2015027737A (ja) * | 2013-07-30 | 2015-02-12 | 松本油脂製薬株式会社 | 把持部品 |
CN106808638A (zh) * | 2015-11-27 | 2017-06-09 | 法国圣戈班玻璃公司 | 注塑件及其形成方法、包边结构以及车窗 |
Also Published As
Publication number | Publication date |
---|---|
GB2305885B (en) | 1999-04-28 |
GB2305885A (en) | 1997-04-23 |
GB9520351D0 (en) | 1995-12-06 |
DE19681577T1 (de) | 1998-12-24 |
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