JP5952027B2 - 中空構造板の製造方法及び製造装置 - Google Patents
中空構造板の製造方法及び製造装置 Download PDFInfo
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- JP5952027B2 JP5952027B2 JP2012036217A JP2012036217A JP5952027B2 JP 5952027 B2 JP5952027 B2 JP 5952027B2 JP 2012036217 A JP2012036217 A JP 2012036217A JP 2012036217 A JP2012036217 A JP 2012036217A JP 5952027 B2 JP5952027 B2 JP 5952027B2
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/10—Forming by pressure difference, e.g. vacuum
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/266—Auxiliary operations after the thermoforming operation
- B29C51/267—Two sheets being thermoformed in separate mould parts and joined together while still in the mould
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- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/10—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using hot gases (e.g. combustion gases) or flames coming in contact with at least one of the parts to be joined
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- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
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Description
本発明の製造方法では、成形シートを形成する工程と、中空凸部同士を熱融着する工程とを、別工程としているため、温度条件や成形速度に制約がなくなり、加工条件の調整が容易になる。
この中空構造板の製造方法では、中空凸部を熱融着する前に各成形シートを予備加熱してもよい。
また、真空成形後の成形シートを強制的に冷却することもできる。
更に、前記一体化する工程により得た中間体の両面に、面材を積層する工程を有していてもよい。
更にまた、前記一体化する工程は、大気中で行うこともできる。
本発明の製造装置では、真空成形部と熱融着部を別に設けているため、各部で温度条件や成形速度を設定することが可能で、各種条件の調整も容易になる。
この製造装置では、前記熱融着部の手前に、各成形シートを予備加熱する加熱槽が設けられていてもよい。
また、真空成形部に、真空成形後の成形シートを強制的に冷却する冷却機構を設けることもできる。
更に、前記熱融着部は、開放系であってもよい。
図3に示すように、本実施形態の製造方法により得られる中空構造板1は、図4及び図5に示す錐台形状の中空凸部2aが千鳥状に形成された2枚の成形シート2が、その中空凸部2a同士を突き合わされて熱融着されている。また、この中空構造板1では、2枚の成形シート2からなる中間体3の両面に、例えば面材4などが積層されている。
本実施形態の中空構造板1では、成形シート2における開口部から仮想される水平面と中空凸部2aとがなす角度(傾斜角)θが、45°〜80°であることが好ましい。傾斜角θが45°未満の場合、面材4との総接着面積が小さくなるため、得られた中空構造板1に荷重をかけた際に接着部が剥がれやすくなり、強度低下を招く。一方、傾斜角θが80°を超えると、真空成形した際に、成形シート2の厚さが薄くなりすぎて中空凸部2a側面がフィルム化し、十分な強度が得られないことがある。
本実施形態の中空構造板1の目付けは、特に限定されるものではないが、500〜3500g/m2とすることが好ましい。中空構造板1の目付けが500g/m2未満の場合、成形シート2の厚さが薄くなりすぎて凸部2a側面がフィルム化し、強度や剛性が低下することがあり、また、目付けが3500g/m2を超えると、質量が増加し、用途によっては軽量性が損なわれることがあるからである。
シート成形工程では、真空成形により、熱可塑性樹脂シートの一方の面に錐台形状の中空凸部2aを千鳥状に形成して、成形シート2を作製する。このシート成形工程は、例えば、図2に示すように、減圧チャンバー11内に、表面に円錐台形状又は角錐台形状のピン12aが複数突設されている1組の成形ローラー12が、その回転軸が相互に平行になるように配置されている真空成形装置(真空成形部10)により実施することができる。
熱融着工程では、前述したシート成形工程で作製した2枚の成形シート2を、その中空凸部2a同士を突き合わせて熱融着し、一体化する。この熱融着工程は、例えば、図2に示すように、真空成形部10のローラー12とロール径が同等で、表面に複数のピン21aが複数突設されている1組のローラー21が、回転軸が相互に平行になるように配置されている熱融着部20により実施することができる。
面材積層工程では、前述した熱融着工程で作製した中間体3の両面に、面材4を積層する。ここで使用する面材4としては、前述した成形シート2と同様に、熱可塑性樹脂シートを使用することができる。その材質は、熱可塑性樹脂であれば特に限定されるものではなく、例えば、ポリエチレン(PE)、ポリプロピレン(PP)及びポリカーボネート(PC)などを使用することができる。また、面材4の厚さは、特に限定されるものではなく、中間体3の厚さ及び中空構造板1の厚さに応じて適宜設定することができる。
目付が500g/m2の2枚の熱可塑性樹脂シート5を、相互に平行な位置関係を保った状態で、減圧チャンバー11内に導入した。その際、熱可塑性樹脂シート5は、いずれも、熱可塑性樹脂(プライムポリマー社製 ポリプロピレン E601)に、フィラー(竹原化学工業社製 タルク含有マスターバッチ 2070T)を配合した熱可塑性樹脂組成物を、ダイから溶融状態で押し出すことにより形成した。
目付けが500g/m2の2枚の熱可塑性樹脂シート5を、相互に平行な位置関係を保った状態で、減圧チャンバー11内に導入した。そして、減圧チャンバー11内に回転可能に配置された1対の成形ローラー12(ピン構成:高さ4.5mm、最小直径2mm、最大直径6mm、傾斜角度約64°)の周面に、熱可塑性樹脂シート5を吸着させて、成形ローラー12に突設されたピン12aの形状に応じて熱可塑性樹脂シート5に多数の中空凸部2aを真空成形した。
2 成形シート
2a 凸部
3 中間体
4 表面材
5 熱可塑性樹脂シート
10 真空成形部
11 減圧チャンバー
12、21、23 ローラー
12a、21a ピン
13 ダイ
14、24 ガイドローラー
14a,24a 溝部
20 熱融着部
22 加熱治具
30 加熱槽
Claims (8)
- 真空成形により、熱可塑性樹脂シートの一方の面に錐台形状の中空凸部を千鳥状に形成して、成形シートを得る工程と、
真空成形後の成形シートを強制的に冷却する冷却工程と、
それぞれ別個に形成され、冷却された2枚の成形シートを、その中空凸部同士を突き合わせて熱融着し、一体化する工程と、を有し、
前記成形シートを得る工程では、少なくとも一つ以上の前記中空凸部に係合し得る溝部を有するガイドローラーを用い、
前記一体化する工程では、複数のピンが千鳥状に形成された1組のローラーを使用し、前記ローラーのピンを各成形シートの中空凸部に挿入し、各中空凸部の頂点部分の少なくとも一部を内側から押圧し、
前記一体化する工程の直前において、前記中空凸部と前記ピンとの嵌合を補助する押さえローラーを用い、
前記一体化する工程で用いるローラーの回転速度は、前記成形シートを得る工程で用いるローラーの回転速度と同等以上とする中空構造板の製造方法。 - 中空凸部を熱融着する前に各成形シートを予備加熱することを特徴とする請求項1に記載の中空構造板の製造方法。
- 更に、前記一体化する工程により得た中間体の両面に、面材を積層する工程を有することを特徴とする請求項1又は2に記載の中空構造板の製造方法。
- 前記一体化する工程を大気中で行うことを特徴とする請求項1から3のいずれか一項に記載の中空構造板の製造方法。
- 減圧チャンバー内に成形ローラーが回転可能に配置され、熱可塑性樹脂シートの一方の面に錐台形状の中空凸部を千鳥状に形成する真空成形部と、
複数のピンが千鳥状に設けられた1組のローラーを備え、前記真空成形部で成形された2枚の成形シートを、その中空凸部同士を突き合わせて熱融着し、一体化する熱融着部と、を有し、
前記熱融着部では、前記ローラーのピンが各成形シートの中空凸部に挿入され、前記ピンにより各中空凸部の頂点部分の少なくとも一部が内側から押圧される中空構造板の製造装置。 - 前記熱融着部の手前に、各成形シートを予備加熱する加熱槽が設けられていることを特徴とする請求項5に記載の中空構造板の製造装置。
- 真空成形部に、真空成形後の成形シートを強制的に冷却する冷却機構が設けられていることを特徴とする請求項5又は6に記載の中空構造板の製造装置。
- 前記熱融着部は、開放系であることを特徴とする請求項5から7のいずれか一項に記載の中空構造板の製造装置。
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