JP4221369B2 - パレット製造方法及びパレットの製造装置 - Google Patents
パレット製造方法及びパレットの製造装置 Download PDFInfo
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- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
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- B27N3/086—Presses with means for extracting or introducing gases or liquids in the mat
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
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- B65D2519/00557—Structures connecting the constitutive elements of the pallet to each other, i.e. load supporting surface, base surface and/or separate spacer without separate auxiliary elements
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- Dry Formation Of Fiberboard And The Like (AREA)
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Description
金属製のパレットは木製より軽いがコストが高く、また錆やすく衛生的でないという問題点があった。
高密度ポリエチレン,ポリプロピレン等の合成樹脂製のパレットは錆たり腐食したりせず衛生的ではあるが、反面、滑りやすい上に軽くなく、また燃えにくく廃棄処分が難しいという問題があり、更には、金型が高価なため多大な設備投資を必要とするという問題点もあった。
これを改良する目的で、本発明者は、ヤシ繊維で作ったパレットを発明し、既に特許を受けている(特許第2778897号)。
この方法は、無方向に絡み合ったヤシ繊維の不織布に樹脂を含浸させこれを金型で加熱加圧して成形するのであるが、不織布の熱伝導が悪いため、パレット1枚成形するのに200〜230℃で3〜4分かかっていた。
加えて、金型の周辺部分が外気で冷やされ中心部よりも温度が上がりにくいことから、パレットの基材全体を均一に加熱するのが困難で、加熱むらが生じやすいという問題があった。
次に、この基材を、多数の熱風口を対向する位置に分散して開口した上下の金型で挟んで加圧すると共に、上下の金型間に通孔を介して熱風を通過して加熱することにより、熱風口からの熱風の吹き出しに伴う凹部を熱風口に対向する面に形成したパレットを成型することを特徴とする。
請求の範囲2の発明は、請求の範囲1の植物繊維が、ココヤシの繊維,油ヤシの繊維,ジュートの繊維のいずれかを解繊したもので、植物繊維であればほとんど全部が利用できるという特徴を有する。
請求の範囲3はパレットの製造装置の発明で、多数の熱風口を上下の金型の対向する位置に分散して開口し、上下いずれか一方の金型の熱風口を熱風発生手段の熱風出口側に、また他方の金型の熱風口を熱風発生手段の熱風戻し口側にそれぞれ接続して、上下の金型間に熱風口を介して熱風を循環して通過し、熱風口からの熱風の吹き出しに伴う凹部を熱風口に対向する面に形成することを特徴とする。
請求項4の発明は、請求項3の金型の周辺部分の熱風口の数を、他の部分より増やすことを特徴とする。
次に、前記基材を、上下より金型で挟むと共に、当該金型に形成した熱風口より熱風を吹出し当該基材を加熱加圧し、パレットを成型する。よって、基材中を熱風が通過する等して熱が伝わり、基材への熱伝導がよくなり、パレットの製造時間を短縮できる。また、熱風口からの熱風の吹き出しに伴う凹部を熱風口に対向する面に形成するので、上に載せた荷が滑落し難くなる。
また、請求項2に記載の発明では、植物繊維を、ココヤシの実,油ヤシの実,ジュートの少なくともいずれかを解繊したものにするので、原材料費を低減できるという効果を生じる。
さらに、請求項3に記載の発明では、熱風を循環させるので、すでに温まっている空気を再加熱するため、熱風発生手段で使用する燃料が少なくてすむ。
また、請求項4に記載の発明では、金型の周辺部分の熱風口の数を、他の部分より増やすので、パレットの周辺部でも他の部分と同様に樹脂が硬化し成型できる。
先ず、ココヤシの実,油ヤシの実,ジュートその他の植物繊維を解繊機で解繊し、繊維が絡み合ったフェルト状の不織布を形成する。ココヤシ,油ヤシは実をクラッシャーにより押しつぶし、さらに粉砕機で粉々に砕いてから解繊する。
次にこの不織布1.0〜3.0kg/m2当り10〜35重量%の液状熱硬化性樹脂たとえばフェノール樹脂,アクリル樹脂,ウレタン樹脂,尿素樹脂,メラミン樹脂,またはレゾールシノール樹脂等を均一に含浸させてシート状の基材を形成する。このとき液状熱硬化性樹脂は、水又はアルコール等の溶媒により樹脂と溶媒を重量比で1:1から1:2に希釈すると粘度が落ちて繊維に染み込みやすくなる。
液状樹脂を含浸するには、不織布の両面より高圧エアによりスプレー塗装してもよいが、樹脂中に含漬したのち圧搾ロールで絞れば充分な剛性のある成型基材が容易に得られる。この場合、上下1対の圧搾ロールのロール間隙を広狭に調節すれば樹脂の含浸量を加減できる。また溶媒の量を変え希釈倍率を調節することにより基材の強度を自由に設定できる。
含浸させる樹脂は熱硬化性に限らず熱可塑性の樹脂たとえば酢酸ビニル,ポリプロピレン,ポリエチレン,オレフィン系樹脂等でもよい。また、液状に限らず粉末状でもよいが均一に含浸させるには液状のほうが好都合である。
金型は図1に示すとおり、上金型1及び下金型2にそれぞれ通孔3a,3bを分散して開口する。当該通孔3a,3bの先端の熱風口4a,4bは、口径を約1cmとし、それぞれの金型1,2の対向する面に5cm×5cmに1個の割合で設ける(よって、1m×1mの面に400個設ける)とよい。さらに、金型の周辺部分は外気で冷やされるので、この部分の熱風口4a,4bの数を他の部分より増やすとよい。
さらに、通孔3aと熱風発生手段であるボイラ5の熱風出口5aとを連結管6を介して接続する。また、通孔3bとボイラ5の熱風戻し口5bとを連結管6を介して接続する。そして、ボイラ5で発生した熱風を、熱風出口5a,連結管6,通孔3a,熱風口4a,熱風口4b,通孔3b,連結管6,熱風戻し口5bと循環して、金型1,2に挟まれた樹脂を含浸させたシート状の基材に熱風を通す。
金型1,2の加圧力を10〜50kgf/cm2とし、前記ボイラ5で供給する熱風を約180〜200℃程度で、約1分で成型が完了する。
フォークリフトのフォークは、図2の矢印のように、正面のみならず、側面からも差し込める。
すなわち、図5(金型内の通孔は図1と同様であるので省略)に示す押圧面11が平坦な金型12,12を使用し、平板状の成型板9を形成する。さらに、図6(金型内の通孔は図1と同様であるので省略)に示す金型13,13を使用し、図7に示すとおりの成型板14を形成し、これを切断して側面コ字状の成型板10を形成する。
そして、平板状の成型板9と側面コ字状の成型板10を釘や接着剤を使用して組み立てパレット15を構成する。
以上のパレットは、組み立て作業が必要となるものの、各種寸法のものを作成しやすいという利点がある。
2 下金型
3a,3b 通孔
4a,4b 熱風口
5 ボイラ
5a 熱風出口
5b 熱風戻し口
6 連結管
7 パレット
8 凹部
9 成型板
10 成型板
11 押圧面
12 金型
13 金型
14 成型板
15 パレット
Claims (4)
- 植物繊維を原料とし、当該植物繊維が無方向に絡み合った不織布に、樹脂を含浸してシート状の基材を形成し、
次に、この基材を、多数の熱風口を対向する位置に分散して開口した上下の金型で挟んで加圧すると共に、上下の金型間に通孔を介して熱風を通過して加熱することにより、熱風口からの熱風の吹き出しに伴う凹部を熱風口に対向する面に形成したパレットを成型することを特徴とするパレットの製造方法。 - 前記植物繊維が、ココヤシの繊維,油ヤシの繊維,ジュートの繊維の少なくともいずれかを解繊したものにすることを特徴とする請求の範囲1に記載のパレットの製造方法。
- 多数の熱風口を上下の金型の対向する位置に分散して開口し、上下いずれか一方の金型の熱風口を熱風発生手段の熱風出口側に、また他方の金型の熱風口を熱風発生手段の熱風戻し口側にそれぞれ接続して、上下の金型間に熱風口を介して熱風を循環して通過し、熱風口からの熱風の吹き出しに伴う凹部を熱風口に対向する面に形成することを特徴とするパレットの製造装置。
- 前記金型の周辺部分の熱風口の数を、他の部分より増やすことを特徴とする請求項3に記載のパレットの製造装置。
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PCT/JP2002/009091 WO2004022438A1 (ja) | 2002-09-06 | 2002-09-06 | パレット製造方法及び製造装置 |
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US (1) | US20060062871A1 (ja) |
EP (1) | EP1541477B1 (ja) |
JP (1) | JP4221369B2 (ja) |
CN (1) | CN1319814C (ja) |
AT (1) | ATE415352T1 (ja) |
AU (1) | AU2002330495A1 (ja) |
BR (1) | BR0215869A (ja) |
DE (1) | DE60230074D1 (ja) |
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US20050284562A1 (en) * | 2004-06-24 | 2005-12-29 | The Boeing Company | Apparatus and methods for forming thermoplastic clamshell components |
JP5374262B2 (ja) * | 2009-07-16 | 2013-12-25 | トヨタ紡織株式会社 | 板状体加熱装置および基材の製造方法 |
KR100985998B1 (ko) * | 2009-09-29 | 2010-10-06 | 백대현 | 경량 팰릿 |
US20130136573A1 (en) | 2010-06-11 | 2013-05-30 | Andrew Berry | Pallet for bags |
WO2012087251A1 (en) * | 2010-12-21 | 2012-06-28 | Jadsadaphongphaibool Bumrung | Artificial wooden pallets from plastic and coconut fiber formulations |
WO2013013705A1 (de) * | 2011-07-26 | 2013-01-31 | Schoeller Arca Systems Gmbh | Transportplatte für sackware |
JP2013154911A (ja) * | 2012-01-30 | 2013-08-15 | Sekisui Plastics Co Ltd | 発泡容器及びその製造方法 |
CN103350439A (zh) * | 2013-07-29 | 2013-10-16 | 四川爱心木业股份有限公司 | 穹顶板及其专用模具 |
JP2020006967A (ja) * | 2018-07-03 | 2020-01-16 | Jx Anci株式会社 | 超薄型パレット |
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US4462785A (en) * | 1981-10-20 | 1984-07-31 | Allen Industries, Inc. | Forming apparatus |
US4517147A (en) * | 1984-02-03 | 1985-05-14 | Weyerhaeuser Company | Pressing process for composite wood panels |
JPS6270938A (ja) * | 1985-09-24 | 1987-04-01 | Nec Corp | デ−タ処理装置 |
JP2778897B2 (ja) * | 1993-03-18 | 1998-07-23 | 有限会社エステートルース | パレットとその製造方法 |
JP3383689B2 (ja) * | 1993-08-27 | 2003-03-04 | 三ツ星ベルト株式会社 | 繊維質成形層体の製造方法 |
JPH091574A (ja) * | 1995-06-22 | 1997-01-07 | Nippon Muki Co Ltd | モールド成形用金型 |
JP3637442B2 (ja) * | 1999-01-21 | 2005-04-13 | 繁男 中尾 | 家屋等の壁面用のブロック |
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EP1541477A1 (en) | 2005-06-15 |
EP1541477B1 (en) | 2008-11-26 |
DE60230074D1 (de) | 2009-01-08 |
BR0215869A (pt) | 2005-07-05 |
CN1319814C (zh) | 2007-06-06 |
JPWO2004022438A1 (ja) | 2005-12-22 |
WO2004022438A1 (ja) | 2004-03-18 |
EP1541477A4 (en) | 2005-11-02 |
MY135100A (en) | 2008-02-29 |
ATE415352T1 (de) | 2008-12-15 |
CN1668506A (zh) | 2005-09-14 |
AU2002330495A1 (en) | 2004-03-29 |
HK1080059A1 (en) | 2006-04-21 |
US20060062871A1 (en) | 2006-03-23 |
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