JP2001212879A - Mold releasability-improved welding mold - Google Patents
Mold releasability-improved welding moldInfo
- Publication number
- JP2001212879A JP2001212879A JP2000026155A JP2000026155A JP2001212879A JP 2001212879 A JP2001212879 A JP 2001212879A JP 2000026155 A JP2000026155 A JP 2000026155A JP 2000026155 A JP2000026155 A JP 2000026155A JP 2001212879 A JP2001212879 A JP 2001212879A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- welding
- sheet
- releasability
- coating
- 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.)
- Pending
Links
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、シートやフィルム
を溶着するために使用する溶着金型に関し、特に金型の
離型性の改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding die used for welding sheets and films, and more particularly, to an improvement in mold releasability.
【０００２】[0002]
【従来の技術】従来、プラスチックフィルムを溶着する
場合、金属は溶融したプラスチックフィルムに対して離
型性が良くないことから、金型とシートの離型性を良く
するために、金型１０の表面に例えば図３に示すように
フッ素樹脂からなる離型性テープ２０を貼り付けたり、
金型とフィルムの間に同様の材料からなる離型性シート
を敷いたりして溶着を行っていた。しかしながら、離型
性テープを貼る方法は、溶着金型がヒートアップされて
いる上、溶着時にはプラスチックフィルムに上下の金型
から圧力がかかるため、金型表面に貼り付けてある離型
性テープの耐久性が落ち、変形したり金型表面から剥離
することがよくあった。そのため、バッグ等の量産に際
しては、テープの交換を頻繁に行う必要があり、その手
間が大変であった。一方、離型性シートを敷く方法は、
離型性シートが金型に固定されているわけではないの
で、金型と離型性シートの間に隙間が生ずることがあ
り、そのため熱伝導にバラツキが生じ、必ずしもプラス
チックフィルムの表面温度が一定にならないことがあ
り、信頼性に問題があった。2. Description of the Related Art Conventionally, when a plastic film is welded, the metal has a poor releasability with respect to the molten plastic film. For example, as shown in FIG. 3, a release tape 20 made of a fluororesin is attached to the surface,
Welding was performed by laying a release sheet made of the same material between the mold and the film. However, the method of applying the release tape is that the welding mold is heated up and pressure is applied to the plastic film from the upper and lower molds at the time of welding. In many cases, the durability deteriorated, and it was often deformed or peeled off from the mold surface. Therefore, when mass-producing bags and the like, it is necessary to frequently change tapes, which is troublesome. On the other hand, the method of laying the release sheet is
Since the mold release sheet is not fixed to the mold, a gap may be created between the mold and the mold release sheet, resulting in variation in heat conduction and a constant surface temperature of the plastic film. And there was a problem with reliability.
【０００３】[0003]
【発明が解決しようとする課題】本発明は如上の事情に
鑑みてなされたもので、離型性テープや離型性シートを
必要とすることが無く、溶着不良の生ずる虞の無い、耐
久性のよい溶着金型を提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and does not require a release tape or a release sheet, has no risk of poor welding, and has durability. It is an object of the present invention to provide a good welding die.
【０００４】[0004]
【課題を解決するための手段】本発明者等は、上記の課
題を解決するために鋭意検討の結果、金型の溶着表面に
微小な凹部を設ければ、プラスチックシートとの接触面
積を小さくすることができ、また、凹部とシートの間の
空気が膨張してシートが離型しやすくなることに想到
し、本発明を完成した。すなわち本発明は、微小な凹部
が形成されると共に離型性樹脂でコーティングされた溶
着表面、を有してなる溶着金型に関する。ここで、離型
性樹脂は、溶着金型とプラスチックシートの離型性を改
良するために採用されるフィルムやシートの形成材料を
意味し、離型性樹脂としてはフッ素系樹脂が好ましく、
特に、ポリテトラフルオロエチレンが好ましい。Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems. As a result, if a minute concave portion is provided on the welding surface of the mold, the contact area with the plastic sheet can be reduced. The present invention has been completed because the air between the concave portion and the sheet expands and the sheet is easily released. That is, the present invention relates to a welding mold having a welding surface formed with minute concave portions and coated with a release resin. Here, the releasable resin means a material for forming a film or a sheet used for improving the releasability of the welding mold and the plastic sheet, and the releasable resin is preferably a fluororesin,
Particularly, polytetrafluoroethylene is preferable.
【０００５】[0005]
【発明の実施の形態】次に本発明の実施例について図面
に基づいて説明する。図１は本発明の実施例を示す平面
図であり、図2は図１の溶着表面の状態を示すＸ−Ｘ線
拡大部分断面図である。本発明の溶着金型１は、図１お
よび図２に示すように、溶着表面１１に微小な凹部２が
形成されており、この溶着表面１１には、さらにコーテ
ィングされた離型性樹脂の被膜３が設けられている。離
型性樹脂としてはフッ素系樹脂が好ましく、特に、ポリ
テトラフルオロエチレンが好ましい。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing an embodiment of the present invention, and FIG. 2 is an enlarged partial cross-sectional view taken along line XX showing a state of a welding surface in FIG. As shown in FIGS. 1 and 2, the welding mold 1 of the present invention has a minute recess 2 formed on a welding surface 11, and the welding surface 11 is further coated with a coating of a release resin. 3 are provided. As the release resin, a fluorine resin is preferable, and particularly, polytetrafluoroethylene is preferable.
【０００６】微小な凹部２を設けることにより、溶着し
ようとするプラスチックシートとの接触面積を小さくす
ることができ、また、凹部２とシートの間の空気が膨張
してシートを圧迫するのでシートが金型１から離型しや
すくなる。凹部２のサイズおよび形状は、シートとの接
触面積と熱伝導の効率を考慮して決められている。限定
するものではないが、通常、凹部２の入り口は、一辺の
長さ０．５〜１．５ｍｍの矩形や、直径０．５〜１．５
ｍｍの円形など適宜の形状に形成され、深さは熱伝導が
悪くならないように０．３ｍｍ以下に決められる。By providing the minute concave portion 2, the contact area with the plastic sheet to be welded can be reduced, and the air between the concave portion 2 and the sheet expands and presses the sheet. It becomes easy to release from the mold 1. The size and shape of the recess 2 are determined in consideration of the contact area with the sheet and the efficiency of heat conduction. Although not limited, usually, the entrance of the concave portion 2 is a rectangle having a side length of 0.5 to 1.5 mm or a diameter of 0.5 to 1.5 mm.
It is formed in an appropriate shape such as a circular shape of mm, and the depth is determined to be 0.3 mm or less so as not to deteriorate heat conduction.
【０００７】被膜３は、離型性を良くするために、溶着
表面１１に設けられる。凹部２には被膜３を形成しなく
てもよいが、溶着の際に、シートの樹脂が熱により膨張
して凹部２の被膜３の形成されていない金属面に引っ付
き、離型性が悪くなる虞があり、また、被膜３には防錆
効果が期待できるので、凹部２を含む溶着表面全体にコ
ーティングするのが好ましい。被膜の厚みは、熱効率を
考慮して、通常５〜５０μに決められる。被膜３の形成
材料としては、溶着金型とプラスチックシートの離型性
を改良するために採用されるフィルムやシートの形成材
料である離型性樹脂が採用される。離型性樹脂としては
例えば、ポリテトラフルオロエチレン、エチレン−テト
ラフルオロエチレン共重合体、ポリビニリデンフルオラ
イド、ポリビニルフルオライド、テトラフルオロエチレ
ン−ヘキサ共重合体、テトラフルオロエチレン−パーフ
ルオロアルキルビニルエーテル、フルオロプロピレンな
どのフッ素系樹脂が採用可能である。これらのフッ素系
樹脂の中では、特に、ポリテトラフルオロエチレンが好
ましい。[0007] The coating 3 is provided on the welding surface 11 to improve the releasability. The coating 3 does not have to be formed in the concave portion 2, but during welding, the resin of the sheet expands due to heat and is stuck to the metal surface of the concave portion 2 where the coating 3 is not formed, resulting in poor releasability. Since there is a possibility that the coating 3 can be expected to have a rust-preventing effect, it is preferable to coat the entire welding surface including the concave portion 2. The thickness of the coating is usually set to 5 to 50 μ in consideration of thermal efficiency. As a material for forming the coating 3, a release resin which is a material for forming a film or a sheet used for improving the releasability of the welding die and the plastic sheet is used. As the release resin, for example, polytetrafluoroethylene, ethylene-tetrafluoroethylene copolymer, polyvinylidene fluoride, polyvinyl fluoride, tetrafluoroethylene-hexa copolymer, tetrafluoroethylene-perfluoroalkyl vinyl ether, fluoro A fluorine-based resin such as propylene can be adopted. Among these fluorine resins, polytetrafluoroethylene is particularly preferred.
【０００８】[0008]
【発明の効果】以上説明してきたことから明らかなよう
に、本発明の溶着金型を採用することにより、従来技術
におけるような金型に貼り付けたテープの貼り換えやシ
ートの交換などを必要としないので、製造ラインを途中
で止める必要が無く、従って、連続生産ができるので生
産効率が向上する。As is evident from the above description, it is necessary to replace the tape attached to the mold or replace the sheet as in the prior art by employing the welding mold of the present invention. Therefore, there is no need to stop the production line halfway, and therefore, continuous production can be performed, so that production efficiency is improved.
【図１】 本発明の実施例を示す平面図である。FIG. 1 is a plan view showing an embodiment of the present invention.
【図２】 図１の溶着表面の状態を示すＸ−Ｘ線拡大部
分断面図である。FIG. 2 is an enlarged partial cross-sectional view taken along line XX showing a state of a welding surface in FIG. 1;
【図３】 溶着表面に離型性テープを貼り付けた従来の
溶着金型を示す説明図である。FIG. 3 is an explanatory view showing a conventional welding die in which a release tape is attached to a welding surface.
１ 溶着金型 １１ 溶着表面 ２ 微小な凹部 ３ 被膜 １０ 溶着金型 ２０ 離型性テープ DESCRIPTION OF SYMBOLS 1 Welding mold 11 Welding surface 2 Fine concave part 3 Coating 10 Welding mold 20 Release tape
─────────────────────────────────────────────────────
────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成１２年２月１７日（２０００．２．１
７）[Submission date] February 17, 2000 (2000.2.1
7)
【手続補正１】[Procedure amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】０００７[Correction target item name] 0007
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【０００７】被膜３は、離型性を良くするために、溶着
表面１１に設けられる。凹部２には被膜３を形成しなく
てもよいが、溶着の際に、シートの樹脂が熱により膨張
して凹部２の被膜３の形成されていない金属面に引っ付
き、離型性が悪くなる虞があり、また、被膜３には防錆
効果が期待できるので、凹部２を含む溶着表面全体にコ
ーティングするのが好ましい。被膜の厚みは、熱効率を
考慮して、通常５〜５０μに決められる。被膜３の形成
材料としては、溶着金型とプラスチックシートの離型性
を改良するために採用されるフィルムやシートの形成材
料である離型性樹脂が採用される。離型性樹脂としては
例えば、ポリテトラフルオロエチレン、エチレン−テト
ラフルオロエチレン共重合体、ポリビニリデンフルオラ
イド、ポリビニルフルオライド、テトラフルオロエチレ
ン−ヘキサフルオロプロピレン共重合体、テトラフルオ
ロエチレン−パーフルオロアルキルビニルエーテル共重
合体などのフッ素系樹脂が採用可能である。これらのフ
ッ素系樹脂の中では、特に、ポリテトラフルオロエチレ
ンが好ましい。[0007] The coating 3 is provided on the welding surface 11 to improve the releasability. The coating 3 does not have to be formed in the concave portion 2, but during welding, the resin of the sheet expands due to heat and is stuck to the metal surface of the concave portion 2 where the coating 3 is not formed, resulting in poor releasability. Since there is a possibility that the coating 3 can be expected to have a rust-preventing effect, it is preferable to coat the entire welding surface including the concave portion 2. The thickness of the coating is usually set to 5 to 50 μ in consideration of thermal efficiency. As a material for forming the coating 3, a release resin which is a material for forming a film or a sheet used for improving the releasability of the welding die and the plastic sheet is used. Examples of the releasing resin include polytetrafluoroethylene, ethylene-tetrafluoroethylene copolymer, polyvinylidene fluoride, polyvinyl fluoride, and tetrafluoroethylene.
-Hexafluoropropylene copolymer, tetrafluoro
Ethylene-perfluoroalkyl vinyl ether copolymer
Fluorine resin such as coalescence can be used. Among these fluororesins, polytetrafluoroethylene is particularly preferred.
Claims (3)
脂でコーティングされた溶着表面、を有してなる溶着金
型。1. A welding die having a welding surface formed with minute concave portions and coated with a release resin.
１に記載の金型。2. The mold according to claim 1, wherein the release resin is a fluororesin.
レンである請求項２に記載の金型。3. The mold according to claim 2, wherein the fluororesin is polytetrafluoroethylene.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000026155A JP2001212879A (en) | 2000-02-03 | 2000-02-03 | Mold releasability-improved welding mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000026155A JP2001212879A (en) | 2000-02-03 | 2000-02-03 | Mold releasability-improved welding mold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001212879A true JP2001212879A (en) | 2001-08-07 |
Family
ID=18551919
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000026155A Pending JP2001212879A (en) | 2000-02-03 | 2000-02-03 | Mold releasability-improved welding mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001212879A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040037657A (en) * | 2002-10-29 | 2004-05-07 | 주식회사 엘지화학 | Thermal adhering method for plastic profile |
| KR101306855B1 (en) * | 2012-07-13 | 2013-09-13 | 주식회사 에스엠피테크닉스 | Mold for plastic deposition and manufacturing method of this |
-
2000
- 2000-02-03 JP JP2000026155A patent/JP2001212879A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040037657A (en) * | 2002-10-29 | 2004-05-07 | 주식회사 엘지화학 | Thermal adhering method for plastic profile |
| KR101306855B1 (en) * | 2012-07-13 | 2013-09-13 | 주식회사 에스엠피테크닉스 | Mold for plastic deposition and manufacturing method of this |
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