WO2010125984A1 - シートパッド - Google Patents

シートパッド Download PDF

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Publication number
WO2010125984A1
WO2010125984A1 PCT/JP2010/057314 JP2010057314W WO2010125984A1 WO 2010125984 A1 WO2010125984 A1 WO 2010125984A1 JP 2010057314 W JP2010057314 W JP 2010057314W WO 2010125984 A1 WO2010125984 A1 WO 2010125984A1
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WO
WIPO (PCT)
Prior art keywords
seat pad
foam
resin material
bead foam
bead
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PCT/JP2010/057314
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English (en)
French (fr)
Inventor
浩二 實藤
善場　正顕
寿充 篠原
Original Assignee
株式会社ブリヂストン
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Application filed by 株式会社ブリヂストン filed Critical 株式会社ブリヂストン
Priority to US13/318,004 priority Critical patent/US20120049605A1/en
Priority to EP10769683.3A priority patent/EP2425749B1/en
Priority to CN201080018747.XA priority patent/CN102413739B/zh
Publication of WO2010125984A1 publication Critical patent/WO2010125984A1/ja
Priority to US14/752,352 priority patent/US20150290848A1/en

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    • 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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
    • B29C44/1228—Joining preformed parts by the expanding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/70—Upholstery springs ; Upholstery
    • B60N2/7017—Upholstery springs ; Upholstery characterised by the manufacturing process; manufacturing upholstery or upholstery springs not otherwise provided for
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C7/00—Parts, details, or accessories of chairs or stools
    • A47C7/02—Seat parts
    • A47C7/28—Seat parts with tensioned springs, e.g. of flat type
    • A47C7/282—Seat parts with tensioned springs, e.g. of flat type with mesh-like supports, e.g. elastomeric membranes
    • 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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/04—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles consisting of at least two parts of chemically or physically different materials, e.g. having different densities
    • 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
    • B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • B29C67/20—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for porous or cellular articles, e.g. of foam plastics, coarse-pored
    • B29C67/205—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for porous or cellular articles, e.g. of foam plastics, coarse-pored comprising surface fusion, and bonding of particles to form voids, e.g. sintering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/64—Back-rests or cushions
    • 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
    • B29K2075/00—Use of PU, i.e. polyureas or polyurethanes or derivatives thereof, as moulding material
    • 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
    • B29K2625/00—Use of polymers of vinyl-aromatic compounds or derivatives thereof for preformed parts, e.g. for inserts
    • B29K2625/04—Polymers of styrene
    • B29K2625/06—PS, i.e. polystyrene
    • 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
    • B29K2715/00—Condition, form or state of preformed parts, e.g. inserts
    • B29K2715/003—Cellular or porous
    • 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
    • B29L2031/58—Upholstery or cushions, e.g. vehicle upholstery or interior padding

Definitions

  • the present invention relates to a seat pad mainly composed of a foamed resin material used for, for example, an automobile seat.
  • Vehicle seat pads used in automobiles, etc. are usually provided with separate members of different hardness at the periphery of soft foam resin such as polyurethane foam that forms the seat pad body, so that support stability and safety It is intended to improve the comfort at the time of sitting while securing the feeling, and to reduce the feeling of fatigue when sitting for a long time.
  • soft foam resin such as polyurethane foam that forms the seat pad body
  • the adhesiveness between the soft foam resin and the separate member is often weak, and the conventional seat pad has a problem that the separate member easily peels from the seat pad body made of the soft foam resin depending on the shape of the separate member. .
  • another member is embedded in a soft foamed resin so as to be flush with the back surface of the resin, making it difficult to peel off.
  • another member made of polyethylene foam with a soft foam resin made of polyurethane foam is subjected to an easy adhesion treatment such as a roughening treatment, thereby bonding the separate member and the seat pad body. It has been proposed to improve.
  • JP 2006-130006 A Japanese Patent Laid-Open No. 1-249312
  • the present invention relates to a seat pad, and in particular, proposes a seat pad in which the adhesive strength between a soft foam resin material and a bead foam is improved without reducing the strength of the bead foam itself.
  • another member made of a bead foam is joined and disposed on at least a part of the seat pad body made of a soft foam resin material, and the fusion rate of the bead foam is 50. It is characterized by being 90%.
  • the fusion rate is a value obtained by quantifying the ratio of the expanded particles to the cross-sectional area of 1 cm 2 of the fracture surface when the molded product of the bead foam is broken. It is the ratio that melts and sticks to each other.
  • the foamed resin material is polyurethane foam and the bead foam is polystyrene foam.
  • the fusion rate of the bead foam 50 to 90% while ensuring the strength of the bead foam itself, the surface of the bead foam is roughened, Since the soft foamed resin material can bite into the rough surface, the adhesive strength between the seat pad main body and the separate member can be improved without performing a pretreatment or the like for increasing the adhesive strength.
  • the strength of the separate member made of the bead foam may be low, or the bead foam itself may be weakly adhered and the bead foam may be peeled off, making it difficult to mold and causing a product defect. there were.
  • it exceeds 90% the entire surface of the bead foam becomes smooth, the amount of biting of the soft foam resin material decreases, and the adhesiveness between the bead foam and the soft foam resin material may be lowered.
  • FIG. 1 is a longitudinal sectional view showing an embodiment of a seat pad of the present invention.
  • reference numeral 1 denotes a seat pad
  • the seat pad 1 includes a seat pad body 2 made of a soft foamed resin material and at least a part of the seat pad body 1.
  • the portion includes a pair of separate members 3 made of a bead foam having a substantially wedge-shaped cross-sectional shape with a thickness gradually reduced toward the center of the width.
  • the seat pad main body 2 has a so-called monofoam structure basically composed of only a single hardness soft foamed resin material, and a required physical property such as hardness is provided on the side of the seat pad main body 2.
  • the side portion can be hardened, so that contradictory physical properties such as ride comfort, holdability and ease of getting on and off, which are difficult to achieve with the monofoam structure alone, Can be applied to the seat pad 1.
  • the seat pad main body 2 is mainly deformed. That is, the pressure fluctuation becomes sufficiently small.
  • the pair of separate members 3 can positively support the occupant.
  • the soft foam resin material of the seat pad body 2 may be a foam resin material having elasticity and the like, and polyurethane foam is preferable from the viewpoint of moldability and sitting comfort.
  • Another member 3 of the bead foam may be a foam made of a synthetic resin such as an olefin resin, but is particularly lightweight, and polystyrene foam is preferable from the viewpoint of heat insulation, buffering of external stress and durability. .
  • the fusion strength of the bead foam is set to 50 to 90%, preferably 50 to 85%, so that the required strength of the separate member 3 is given and the seat pad body 2 and Adhesive strength with the separate member 3 can be sufficiently increased.
  • This fusion rate can be controlled by the molding temperature, heating time, and the like.
  • a seat pad 1 For manufacturing such a seat pad 1, for example, another member is positioned and arranged on a mold, a stock solution of a soft foam resin material is supplied to the mold, the mold is closed, and the stock solution is heated. After the foaming is completed, the soft foamed resin material is cured, opened, and demolded.
  • the separate member 3 positioned and arranged in the mold is bonded to the seat pad main body 2 and integrated with the sheet pad main body 2, and is smoothly released from the mold together with the seat pad main body 2.
  • a polyurethane foam soft foam resin material 12 and a polystyrene foam bead foam 13 with a fusion rate as shown in Table 1 are joined together, and a peel tester (test Five test pieces of size 200 ⁇ 25 ⁇ 6 (thickness) mm were prepared using the machine name “Intesco”, and the test pieces were pasted on an alcohol-cleaned stainless steel plate (JIS # 280 polishing) and pasted for 20 minutes. Thereafter, a 90 ° peel test was performed at room temperature (25 ⁇ 10 ° C.) to measure the peel strength.
  • the evaluation results are shown in Table 1 and FIGS.
  • the peel rate is set to 300 mm / min, and the measured values and average values of five test pieces are recorded.
  • surface is an average value of each five test pieces.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Transportation (AREA)
  • Manufacturing & Machinery (AREA)
  • Mattresses And Other Support Structures For Chairs And Beds (AREA)
  • Chair Legs, Seat Parts, And Backrests (AREA)
  • Laminated Bodies (AREA)

Abstract

　軟質発泡樹脂材料とビーズ発泡体との接着強度を、ビーズ発泡体それ自体の強度低下なしに向上させたシートパッドを提案する。軟質発泡樹脂材料よりなるシートパッド本体２の少なくとも一部に、ビーズ発泡体よりなる別部材３を接合配置し、前記ビーズ発泡体の融着率が５０～９０％であることを特徴とする。

Description

シートパッド
　本発明は、例えば自動車のシート等に使用される発泡樹脂製材料を主体としてなるシートパッドに関するものである。
　自動車等に用いられる車両用シートパッドは通常、シートパッド本体を形成するポリウレタンフォーム等の軟質発泡樹脂の周辺部等に部分的に硬度の異なる別部材を配設して、支持安定性、安全性を確保した上で着座時の快適性を向上させ、また、長時間着座した際の疲労感を低減すること等を企図している。
　しかしながら、軟質発泡樹脂と別部材との接着性が弱いことが多く、従来のシートパッドでは別部材の形状によっては、別部材が軟質発泡樹脂よりなるシートパッド本体から剥離し易いという問題があった。
　これがため、例えば特許文献１に開示されているように、別部材を、軟質発泡樹脂に、それの裏面とに面一に位置させて埋設させて剥離し難くしたり、また、特許文献２に開示されているように、ポリウレタン発泡体からなる軟質発泡樹脂にてポリエチレン発泡体からなる別部材を、粗面化処理等の易接着化処理をすることで、別部材とシートパッド本体との接着を改善することが提案されている。
　しかるに、これらの従来技術では、埋設するための前処理が必要であったり、表面処理等の、多くの作業工数等が必要になり、作業効率の低減は否めなかった。
特開２００６−１３０００６号公報 特開平１−２４９３１２号公報
　本発明は、シートパッドに関するものであり、特には、軟質発泡樹脂材料とビーズ発泡体との接着強度を、ビーズ発泡体それ自体の強度低下なしに向上させたシートパッドを提案するものである。
　この発明のシートパッドでは、軟質発泡樹脂材料よりなるシートパッド本体の少なくとも一部に、ビーズ発泡体よりなる別部材を接合配置してなるものであって、前記ビーズ発泡体の融着率が５０~９０％であることを特徴とするものである。
　ここで、融着率とは、ビーズ発泡体の成形品を割った時に、その破断面の断面積１ｃｍ２に対する、発泡粒子の割合を数値化したものであり、ビーズ発泡体の原料であるビーズが溶けて互いがくっつく割合である。
　このようなシートパッドにおいてより好ましくは、前記発泡樹脂材料をポリウレタンフォームとし、ビーズ発泡体をポリスチレンフォームとする。
　本発明のシートパッドでは、特に、ビーズ発泡体の融着率を５０~９０％とすることで、ビーズ発泡体それ自体の強度を確保する一方で、ビーズ発泡体の表面が粗面化され、その粗面に軟質発泡樹脂材料が食い込むことができるため、接着強度を高める前処理等をすることなく、シートパッド本体と別部材の接着強度を向上させることができる。
　すなわち、それが５０％未満では、ビーズ発泡体からなる別部材の強度が低くなることや、ビーズ発泡体自身の接着が弱くビーズ発泡体が剥がれて成形が困難になり、製品不良を引きおこすおそれがあった。一方、９０％を超えると、ビーズ発泡体の全体の表面が平滑になり、軟質発泡樹脂材料の食い込み量が減り、ビーズ発泡体と軟質発泡樹脂材料との接着性が低下するおそれがあった。
本発明の座部シートパッドの一の実施形態を示す縦断面図である。 本発明の実施例の試験方法を示す図である。 本発明の実施例の結果を示す図である。 本発明の実施例に用いたビーズ発泡体の表面の拡大写真を示す図である。
　以下に、図面を参照しながら本発明の座部シートパッドを詳細に説明する。
　図１は、本発明の座部シートパッドの一の実施形態を示す縦断面図である。
　図中１は座部シートパッドを示し、このシートパッド１には、軟質発泡樹脂材料製のシートパッド本体２と、このシートパッド本体１の、少なくとも一部、図ではシートパッド本体２の下側部に、幅の中央に向けて、厚みを漸減させた、ほぼ楔状の断面形状を有するビーズ発泡体製の、一対の別部材３とを具える。
　ここでシートパッド本体２は、基本的に単一硬度の軟質発泡樹脂材料のみから構成される、いわゆるモノフォーム構造となっており、そのシートパッド本体２の側部に所要の物性、例えば硬度の別部材３を配置することで、サイド部を高硬度化することができるため、モノフォーム構造のみでは達成が困難であった、乗り心地、ホールド性および乗り降り容易性等の相反する物性を、座部シートパッド１に付与することができる。
　このような座部シートパッド１によれば、それが乗員の着座による荷重によって圧潰方向に変形されると、主にシートパッド本体２が変形するため、臀部および大腿部に掛かる圧力が均質化、すなわち圧力変動が十分小さくなる。この一方で、一対の別部材３によって、乗員に対して積極的なサイドサポートをすることができる。
　また、シートパッド本体２の軟質発泡樹脂材料は、弾力性等を有する発泡樹脂材料であればよく、成形性や座り心地の点からポリウレタンフォームが好ましい。
　ビーズ発泡体の別部材３は、オレフィン系樹脂などの合成樹脂よりなる発泡体が挙げられるが、特に軽量で、断熱性や外部からの応力の緩衝性および耐久性の観点からはポリスチレンフォームが好ましい。
　そしてこのシートパッド１では、ビーズ発泡体の融着率を５０~９０％、好ましくは５０~８５％とすることで、その別部材３の所要の強度を付与してなお、シートパッド本体２と別部材３との接着強度を十分に高めることができる。
　なお、この融着率は、その成形温度、加熱時間などで制御することができる。
　このようなシートパッド１の製造は、例えば、別部材を金型に、位置決め配置しておき、その金型に、軟質発泡樹脂材料の原液を供給し、型閉めするとともに、その原液を、加熱発泡させ、その発泡の終了後、軟質発泡樹脂材料をキュアさせ、型開きし、脱型することによって行うことができる。金型に位置決め配置した別部材３はシートパッド本体２に接着されて、それを一体にされており、金型からシートパッド本体２とともにスムーズに離型されることになる。
　次に、図２に示すような構造で、ポリウレタンフォームの軟質発泡樹脂材料１２と、表１に示すような融着率のポリスチレンフォームのビーズ発泡体１３とを接合させて、剥離試験機（試験機名Ｉｎｔｅｓｃｏ）を用いて、サイズ２００×２５×６（厚み）ｍｍの試験片を５個準備し、その試験片をアルコール洗浄したステンレス板（ＪＩＳ＃２８０研磨）に貼り付け、貼り付け２０分後、常温（２５±１０℃）で９０度剥離試験を行い、剥離強度を測定した。その評価結果を表１および、図３，４に示す。
　ここで、剥離速度は３００ｍｍ／ｍｉｎとし、試験片５個の実測値およびその平均値を記録する。
　なお、表中の値は、それぞれの試験片５個の平均値である。
Figure JPOXMLDOC01-appb-T000001
　表１および、図３，４の結果から、ビーズ発泡体の融着率が５０~９０％の範囲では、ビーズ発泡体それ自体の強度低下なしに、軟質発泡樹脂材料１２とビーズ発泡体１３の優れた接着強度を示した。
　１　　シートパッド
　２　　シートパッド本体
　３　　別部材
　１２　軟質発泡樹脂材料
　１３　ビーズ発泡体

Claims (2)

  1. 　軟質発泡樹脂材料よりなるシートパッド本体の少なくとも一部に、ビーズ発泡体よりなる別部材を接合配置してなるシートパッドにおいて、
    　前記ビーズ発泡体の融着率が５０~９０％であることを特徴とするシートパッド。
  2. 　前記発泡樹脂材料がポリウレタンフォームであり、ビーズ発泡体がポリスチレンフォームである請求項１に記載のシートパッド。
PCT/JP2010/057314 2009-04-30 2010-04-20 シートパッド WO2010125984A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US13/318,004 US20120049605A1 (en) 2009-04-30 2010-04-20 Seat pad
EP10769683.3A EP2425749B1 (en) 2009-04-30 2010-04-20 Seat pad
CN201080018747.XA CN102413739B (zh) 2009-04-30 2010-04-20 坐垫
US14/752,352 US20150290848A1 (en) 2009-04-30 2015-06-26 Seat pad

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2009111255A JP5753342B2 (ja) 2009-04-30 2009-04-30 シートパッド
JP2009-111255 2009-04-30

Related Child Applications (2)

Application Number Title Priority Date Filing Date
US13/318,004 A-371-Of-International US20120049605A1 (en) 2009-04-30 2010-04-20 Seat pad
US14/752,352 Division US20150290848A1 (en) 2009-04-30 2015-06-26 Seat pad

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WO2010125984A1 true WO2010125984A1 (ja) 2010-11-04

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US (2) US20120049605A1 (ja)
EP (1) EP2425749B1 (ja)
JP (1) JP5753342B2 (ja)
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CN102413739A (zh) 2012-04-11
JP5753342B2 (ja) 2015-07-22
CN102413739B (zh) 2015-10-14
EP2425749B1 (en) 2014-12-17
US20150290848A1 (en) 2015-10-15
EP2425749A4 (en) 2012-10-03
US20120049605A1 (en) 2012-03-01
EP2425749A1 (en) 2012-03-07
JP2010259535A (ja) 2010-11-18

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