JP4048148B2 - Method for joining synthetic resin sheets - Google Patents
Method for joining synthetic resin sheets Download PDFInfo
- Publication number
- JP4048148B2 JP4048148B2 JP2003130615A JP2003130615A JP4048148B2 JP 4048148 B2 JP4048148 B2 JP 4048148B2 JP 2003130615 A JP2003130615 A JP 2003130615A JP 2003130615 A JP2003130615 A JP 2003130615A JP 4048148 B2 JP4048148 B2 JP 4048148B2
- Authority
- JP
- Japan
- Prior art keywords
- sheet
- synthetic resin
- polypropylene
- anvil
- insertion space
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Lifetime
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- Lining Or Joining Of Plastics Or The Like (AREA)
Description
【0001】
【発明の属する分野】
本発明は合成樹脂シートの接合、特に融点の異なる合成樹脂シートの接合方法に関する。
【0002】
【従来の技術】
近年、種々の用途に応じた合成樹脂フィルム又はシートの開発が盛んに行われている。取り分け、用途によっては、軟質であると同時に腰のある弾力性を有する合成樹脂シートが要求される。かかるシートは、中間層としてエチレンビニルアセテート層を有し、その両側にポリプロピレン層を積層させた所謂三層構造のものである。中間層のエチレンビニルアセテートはシート全体に透明性と柔軟性を与え、両側のポリプロピレン層はシートに透明性と適度な剛性を与えるのに寄与している。
【0003】
【発明が解決しようとする課題】
合成樹脂シートの加工においてシートとシートを高周波溶接のような熱溶着により接合することがしばしば必要になる。上述した三層構造の合成樹脂シートは、同じシートとの接合であれば、しっかりした熱溶着が可能である。しかし、ポリプロピレンシートとの接合の場合には、三層構造であるがために、融点がポリプロピレン(約180℃)よりも低く(約120〜130℃)なることから、融点の異なる合成樹脂シートの接合ということになり、完全な熱溶着が行われにくい欠点があった。本発明者はそのような合成樹脂シートの組み合わせあっても、巧く接合できないものかと種種研究を重ね、本発明に至ったものである。
従って、本発明の目的は、上述した三層構造の合成樹脂シートとポリプロピレンシートとを直接ではなく間接的に熱溶着させることによって接合する、融点の異なる合成樹脂シートの接合方法を提供することにある。
【0004】
【課題を解決するための手段】
本発明のこの目的は、突出部を有するアンビルと、これと協同する超音波ホーンとを含む超音波溶接工具を準備し、中間層としてエチレンビニルアセテート層を有し、その両側にポリプロピレン層を積層してなる三層構造の合成樹脂シートの端部分を折り返して熱溶着により合成樹脂シートと折り返しシート部分との間に所定幅の差し込み空間を構成し、差し込み空間を構成するシート部分と折り返しシート部分に穴を形成し、差し込み空間にポリプロピレンの帯状片を挿入し、前記三層構造の合成樹脂シートにポリプロピレンシートを重ね合わせ、前記アンビルの突出部に前記シート部分の穴を位置決めし、超音波ホーンをアンビルの突出部に接近させ、且つ超音波ホーンを賦勢して、ポリプロピレンシートとポリプロピレンの帯状片とを穴の中で熱溶着させる、ことを特徴とする合成樹脂シートの接合方法を提供することによって達成される。
【0005】
好ましい実施形態では、アンビルは間隔を隔てた複数個の突出部を備え、差し込み空間を構成するシート部分と折り返しシート部分には、アンビルの突出部に相当する箇所にそれぞれ穴が形成される。更に、差し込み口を一カ所残して前記差し込み空間の周囲が熱溶着され、ポリプロピレンの帯状片はこの差し込み口から差し込み空間に挿入される。
【0006】
【発明の実施形態】
図面を参照して本発明による接合方法の実施形態を詳細に説明する。
図1は三層構造の合成樹脂シート1の断面図である。三層構造の合成樹脂シート1は、中間層としてシートの透明性と柔軟性をもたらすエチレンビニルアセテート層2を有し、その両側にシートの透明性と適度な剛性をもたらすポリプロピレン層3が積層されている。そのため、三層構造の合成樹脂シートは柔軟性と透明性に富み、しかも弾力性を併せ持ったものである。図2は接合前の三層構造の合成樹脂シート1とポリプロピレンシート4の概略斜視図である。三層構造の合成樹脂シート1の端部分5が折り返されて熱溶着6により合成樹脂シート1と折り返しシート部分7との間に所定幅の差し込み空間8が構成される。熱溶着6は、例えば、図示のように差し込み口9を一カ所残して差し込み空間8の周囲に施されるのが好ましい。差し込み空間8を構成するシート部分1'と折り返しシート部分7には、少なくとも1個、好ましくは、図示のように間隔を隔てた複数個の穴10が形成される。差し込み空間8には差し込み口9からポリプロピレンの帯状片11が挿入される。ポリプロピレンシート4が三層構造の合成樹脂シート1に重ね合わされる。
【0007】
図3に示すように、超音波溶接工具は穴10に相当する箇所に突出部12を有するアンビル13と、これと協同する超音波ホーン14と、を含む。図3から明らかなように、ポリプロピレンシート4を重ね合わせた状態で、アンビル13の突出部12に、差し込み空間8を構成するシート部分及び折り返しシート部分の穴10が位置決めされる。超音波ホーン14をアンビル13の突出部12に接近させ、超音波ホーン14を賦勢して、ポリプロピレンシート4とポリプロピレンの帯状片11を穴10の中で熱溶着15させる(図4参照)。
【0008】
上記の事から分かるように、三層構造の合成樹脂シートはポリプロピレンシートに直接熱溶着されないが、三層構造の合成樹脂シートの穴の中にポリプロピレン帯状片とポリプロピレンシートとの熱溶着部が形成されるため三層構造の合成樹脂シートはポリプロピレンシートに間接的に接合されることになる。
【図面の簡単な説明】
【図1】本発明に使用される三層構造の合成樹脂シートの断面図である。
【図2】三層構造の合成樹脂シートとポリプロピレンシートの接合前の斜視図である。
【図3】超音波溶接工具と三層構造の合成樹脂シート及びポリプロピレンシートとの関係を示す概略断面図である。
【図4】ポリプロピレン帯状片とポリプロピレンシートとの熱溶着状態を示す拡大図である。
【符号の説明】
1 三層構造の合成樹脂シート
2 エチレンビニルアセテート層
3 ポリプロピレン層
4 ポリプロピレンシート
5 端部分
6 熱溶着
7 折り返しシート部分
8 差し込み空間
9 差し込み口
10 穴
11 ポリプロピレンの帯状片
12 突出部
13 アンビル
14 超音波ホーン
15 熱溶着[0001]
[Field of the Invention]
The present invention relates to a method for joining synthetic resin sheets, particularly a method for joining synthetic resin sheets having different melting points.
[0002]
[Prior art]
In recent years, development of synthetic resin films or sheets according to various uses has been actively conducted. In particular, depending on the application, a synthetic resin sheet that is flexible and has elasticity at the same time is required. Such a sheet has a so-called three-layer structure in which an ethylene vinyl acetate layer is provided as an intermediate layer and a polypropylene layer is laminated on both sides thereof. The ethylene vinyl acetate in the intermediate layer provides transparency and flexibility to the entire sheet, and the polypropylene layers on both sides contribute to providing transparency and appropriate rigidity to the sheet.
[0003]
[Problems to be solved by the invention]
In the processing of a synthetic resin sheet, it is often necessary to join the sheets by thermal welding such as high-frequency welding. If the synthetic resin sheet having the three-layer structure described above is bonded to the same sheet, it can be firmly welded. However, in the case of joining with a polypropylene sheet, since it has a three-layer structure, the melting point is lower (about 120 to 130 ° C.) than that of polypropylene (about 180 ° C.). There was a drawback that it was difficult to perform complete heat welding. The present inventor has conducted various studies on whether or not such a combination of synthetic resin sheets can be skillfully joined, and has arrived at the present invention.
Accordingly, an object of the present invention is to provide a method of joining synthetic resin sheets having different melting points, which are joined by indirectly welding, instead of directly, the above-mentioned three-layer synthetic resin sheet and polypropylene sheet. is there.
[0004]
[Means for Solving the Problems]
This object of the present invention is to prepare an ultrasonic welding tool including an anvil having a protrusion and an ultrasonic horn cooperating therewith, having an ethylene vinyl acetate layer as an intermediate layer, and laminating a polypropylene layer on both sides thereof. The end portion of the synthetic resin sheet having a three-layer structure is folded back to form an insertion space of a predetermined width between the synthetic resin sheet and the folded sheet portion by heat welding, and the sheet portion and the folded sheet portion constituting the insertion space A hole is formed in the insertion space, a polypropylene strip is inserted into the insertion space, a polypropylene sheet is overlaid on the synthetic resin sheet having the three-layer structure, the hole in the sheet portion is positioned at the protruding portion of the anvil, and an ultrasonic horn The polypropylene sheet and the strip of polypropylene with the ultrasonic horn energized. Is thermally welded in, it is achieved by providing a method of joining synthetic resin sheet, characterized in that.
[0005]
In a preferred embodiment, the anvil includes a plurality of protrusions spaced apart from each other, and holes are formed in the sheet portion and the folded sheet portion constituting the insertion space at locations corresponding to the protrusion portions of the anvil. Furthermore, the periphery of the insertion space is thermally welded, leaving one insertion port, and a strip of polypropylene is inserted into the insertion space from this insertion port.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of a joining method according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view of a
[0007]
As shown in FIG. 3, the ultrasonic welding tool includes an
[0008]
As can be seen from the above, the synthetic resin sheet with a three-layer structure is not directly heat welded to the polypropylene sheet, but a heat-welded portion between the polypropylene strip and the polypropylene sheet is formed in the hole of the synthetic resin sheet with the three-layer structure. Therefore, the synthetic resin sheet having a three-layer structure is indirectly joined to the polypropylene sheet.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a synthetic resin sheet having a three-layer structure used in the present invention.
FIG. 2 is a perspective view before joining a synthetic resin sheet having a three-layer structure and a polypropylene sheet.
FIG. 3 is a schematic cross-sectional view showing the relationship between an ultrasonic welding tool, a three-layer synthetic resin sheet, and a polypropylene sheet.
FIG. 4 is an enlarged view showing a heat-welded state between a polypropylene strip and a polypropylene sheet.
[Explanation of symbols]
DESCRIPTION OF
10 holes
11 Polypropylene strip
12 Protrusion
13 Anvil
14 Ultrasonic horn
15 Heat welding
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003130615A JP4048148B2 (en) | 2003-05-08 | 2003-05-08 | Method for joining synthetic resin sheets |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003130615A JP4048148B2 (en) | 2003-05-08 | 2003-05-08 | Method for joining synthetic resin sheets |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2004330647A JP2004330647A (en) | 2004-11-25 |
JP4048148B2 true JP4048148B2 (en) | 2008-02-13 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2003130615A Expired - Lifetime JP4048148B2 (en) | 2003-05-08 | 2003-05-08 | Method for joining synthetic resin sheets |
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JP (1) | JP4048148B2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009107140A (en) * | 2007-10-26 | 2009-05-21 | Hirohisa Kida | Ultrasonic welding structure and its method |
DE102016000756A1 (en) * | 2016-01-25 | 2017-07-27 | Gottlieb Binder Gmbh & Co. Kg | Method of making sanitary closure systems, in particular diaper fastening systems |
-
2003
- 2003-05-08 JP JP2003130615A patent/JP4048148B2/en not_active Expired - Lifetime
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Publication number | Publication date |
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JP2004330647A (en) | 2004-11-25 |
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