JP4048148B2 - Method for joining synthetic resin sheets - Google Patents

Method for joining synthetic resin sheets Download PDF

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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
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Prior art keywords
sheet
synthetic resin
polypropylene
anvil
insertion space
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JP2003130615A
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JP2004330647A (en
Inventor
幸俊 竹田
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株式会社 ユーレックス・ジャパン
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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 synthetic resin sheet 1 having a three-layer structure. The synthetic resin sheet 1 having a three-layer structure has an ethylene vinyl acetate layer 2 that provides transparency and flexibility of the sheet as an intermediate layer, and a polypropylene layer 3 that provides transparency and appropriate rigidity of the sheet is laminated on both sides thereof. ing. Therefore, the synthetic resin sheet having a three-layer structure is rich in flexibility and transparency, and also has elasticity. FIG. 2 is a schematic perspective view of the synthetic resin sheet 1 and the polypropylene sheet 4 having a three-layer structure before joining. An end portion 5 of the synthetic resin sheet 1 having a three-layer structure is folded back, and an insertion space 8 having a predetermined width is formed between the synthetic resin sheet 1 and the folded sheet portion 7 by heat welding 6. The heat welding 6 is preferably performed around the insertion space 8 with one insertion port 9 left as shown in the figure, for example. At least one, preferably a plurality of holes 10 are formed in the sheet portion 1 ′ and the folded sheet portion 7 constituting the insertion space 8 at intervals as shown in the figure. A polypropylene strip 11 is inserted into the insertion space 8 from the insertion port 9. A polypropylene sheet 4 is superposed on the synthetic resin sheet 1 having a three-layer structure.
[0007]
As shown in FIG. 3, the ultrasonic welding tool includes an anvil 13 having a protrusion 12 at a location corresponding to the hole 10, and an ultrasonic horn 14 that cooperates therewith. As apparent from FIG. 3, in the state where the polypropylene sheet 4 is overlapped, the hole 10 in the sheet portion and the folded sheet portion constituting the insertion space 8 is positioned in the protruding portion 12 of the anvil 13. The ultrasonic horn 14 is brought close to the protruding portion 12 of the anvil 13 and the ultrasonic horn 14 is energized to heat-bond 15 the polypropylene sheet 4 and the polypropylene strip 11 in the hole 10 (see FIG. 4).
[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 SYMBOLS 1 Synthetic resin sheet of 3 layer structure 2 Ethylene vinyl acetate layer 3 Polypropylene layer 4 Polypropylene sheet 5 End part 6 Thermal welding 7 Folding sheet part 8 Insertion space 9 Insertion slot
10 holes
11 Polypropylene strip
12 Protrusion
13 Anvil
14 Ultrasonic horn
15 Heat welding

Claims (3)

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。Preparation of an ultrasonic welding tool including an anvil having a protrusion and an ultrasonic horn cooperating therewith, synthesis of a three-layer structure comprising an ethylene vinyl acetate layer as an intermediate layer and a polypropylene layer laminated on both sides thereof An end portion of the resin sheet 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 a hole is formed in the sheet portion and the folded sheet portion constituting the insertion space. A polypropylene strip is inserted into the three-layer synthetic resin sheet, the polypropylene sheet is overlaid, the hole in the sheet portion is positioned in the protruding portion of the anvil, and the ultrasonic horn is brought close to the protruding portion of the anvil. And energizing the ultrasonic horn to thermally weld the polypropylene sheet and the strip of polypropylene in the hole. Method of joining synthetic resin sheet, wherein the door. 前記アンビルは間隔を隔てた複数個の突出部を備え、前記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ている、請求項１に記載の合成樹脂シートの接合方法。The said anvil is provided with the some protrusion part spaced apart, The hole is each formed in the location corresponding to the protrusion part of an anvil in the sheet | seat part and the folding sheet | seat part which comprise the said insertion space. The method for joining synthetic resin sheets according to 1. 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、前記ポリプロピレンの帯状片は前記差し込み口から前記差し込み空間に挿入される、請求項１に記載の合成樹脂シートの接合方法。The synthetic resin sheet joining method according to claim 1, wherein a periphery of the insertion space is thermally welded while leaving one insertion port, and the polypropylene strip is inserted into the insertion space from the insertion port.
JP2003130615A 2003-05-08 2003-05-08 Method for joining synthetic resin sheets Expired - Lifetime JP4048148B2 (en)

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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

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