JPH0780237B2 - Bending method and folding device for thermoplastic resin sheet - Google Patents
Bending method and folding device for thermoplastic resin sheetInfo
- Publication number
- JPH0780237B2 JPH0780237B2 JP2166420A JP16642090A JPH0780237B2 JP H0780237 B2 JPH0780237 B2 JP H0780237B2 JP 2166420 A JP2166420 A JP 2166420A JP 16642090 A JP16642090 A JP 16642090A JP H0780237 B2 JPH0780237 B2 JP H0780237B2
- Authority
- JP
- Japan
- Prior art keywords
- resin sheet
- thermoplastic resin
- bending
- folding
- heating
- 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
Links
- 229920005992 thermoplastic resin Polymers 0.000 title claims description 73
- 238000005452 bending Methods 0.000 title claims description 34
- 238000000034 method Methods 0.000 title claims description 19
- 238000010438 heat treatment Methods 0.000 claims description 25
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 229920005989 resin Polymers 0.000 claims description 2
- 239000011347 resin Substances 0.000 claims description 2
- 229920001169 thermoplastic Polymers 0.000 claims 1
- 239000004416 thermosoftening plastic Substances 0.000 claims 1
- 230000002087 whitening effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical class ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000000088 plastic resin Substances 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Landscapes
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、熱可塑性樹脂シートの製造、特には、各種包
装用ケース等に使用される熱可塑性樹脂シートの折曲方
法及び折曲装置に関するものである。TECHNICAL FIELD The present invention relates to the production of a thermoplastic resin sheet, and more particularly to a method and apparatus for folding a thermoplastic resin sheet used in various packaging cases and the like. It is a thing.
［従来の技術］ 比較的厚く、かつ硬質の熱可塑性樹脂シートの折曲加工
は、通常、当該熱可塑性樹脂シート１をある程度加熱し
て軟化させた状態で行われるが、熱可塑性樹脂シートは
加熱するとその表面にしわが形成されたり、その寸法に
くるいが生じるという問題点があった。[Prior Art] Bending of a relatively thick and hard thermoplastic resin sheet is usually performed in a state where the thermoplastic resin sheet 1 is heated to some extent to be softened, but the thermoplastic resin sheet is heated. Then, there have been problems that wrinkles are formed on the surface and that the dimensions are rounded.
他方、冷間ないしは比較的低い温度すなわち熱可塑性樹
脂シートの軟化点未満の温度で折曲加工を行った場合に
は、十分に折り曲げることができず折り曲げがあまくな
ってしまうほか、折曲部が白くなるという白化現象が起
こるという問題点があり、これにはまた加工時間が長く
かかるという問題点もあった。また、折曲部付近のみを
熱可塑性樹脂シートの軟化点まで加熱して折曲加工を行
う方法もあるが、この場合も、シート厚がある程度以上
ある熱可塑性樹脂シートの場合には、上記の問題が依然
として解決されず、精度の点でも問題があった。On the other hand, when the bending process is performed at a cold temperature or a relatively low temperature, that is, a temperature lower than the softening point of the thermoplastic resin sheet, the bending cannot be sufficiently performed and the bending is not smooth. There is a problem in that a whitening phenomenon of whitening occurs, and this also has a problem that it takes a long processing time. Further, there is also a method of heating only the vicinity of the bent portion to the softening point of the thermoplastic resin sheet to perform bending processing. In this case as well, in the case of a thermoplastic resin sheet having a sheet thickness of a certain amount or more, The problem was still unsolved, and there was a problem in terms of accuracy.
［発明が解決しようとする課題］ 本発明は、上記従来技術の問題点にかんがみ、シート厚
がある程度以上ある硬質の熱可塑性樹脂シートの折曲加
工を冷間で行っても、折り曲げがあまくなったり、折曲
部が白化現象を起こしたりせず、精度良く、かつ、加工
時間も短い熱可塑性樹脂シートの折曲方法及び折曲装置
を提供することを目的としている。[Problems to be Solved by the Invention] In view of the above-mentioned problems of the prior art, the present invention provides good bending even when cold bending is performed on a hard thermoplastic resin sheet having a certain sheet thickness or more. It is an object of the present invention to provide a folding method and a folding device for a thermoplastic resin sheet, which does not cause a whitening phenomenon in a bent portion and is accurate and has a short processing time.
［課題を解決するための手段］ 上記目的を達成するため、本発明の熱可塑性樹脂シート
の折曲方法は、熱可塑性樹脂シートを断面コ状に折り曲
げる際に、熱可塑性樹脂シートの２本の折曲線上のみを
同時に加熱した後、該熱可塑性樹脂シートの加熱した部
分が内側となるように熱可塑性樹脂シートの一端面が折
曲部をはさんで当該熱可塑性樹脂シートとほぼ平行にな
るまで折り曲げることを要旨とする。[Means for Solving the Problems] In order to achieve the above object, the method for bending a thermoplastic resin sheet according to the present invention is a method of bending a thermoplastic resin sheet into a U-shaped cross section. After heating only on the folding curve at the same time, one end face of the thermoplastic resin sheet is substantially parallel to the thermoplastic resin sheet with the bent portion sandwiched so that the heated portion of the thermoplastic resin sheet is on the inside. The point is to fold up to.
また、本発明の熱可塑性樹脂シートの折曲装置は、熱可
塑性樹脂シート載置台と、該載置台に移動可能に設けら
れた熱可塑性樹脂シートの２本の折曲線上のみを同時に
加熱する加熱部材と、熱可塑性樹脂シートの折曲部の厚
さを規制する規制板と、該規制板に沿って前記熱可塑性
樹脂シートの加熱した部分が内側となるように熱可塑性
樹脂シートを折り曲げる折曲部材とからなることを要旨
とする。The thermoplastic resin sheet folding device of the present invention is a heating device that heats only the thermoplastic resin sheet mounting base and the thermoplastic resin sheet movably provided on the mounting base on two folding curves at the same time. A member, a regulation plate that regulates the thickness of the bent portion of the thermoplastic resin sheet, and a bend that bends the thermoplastic resin sheet so that the heated portion of the thermoplastic resin sheet is on the inside along the regulation plate. The gist is that it consists of members.
また、熱可塑性樹脂シートの折曲装置において、加熱部
材及び折曲部材をそれぞれ複数備え、熱可塑性樹脂シー
トの少なくとも２端を同時に折り曲げるようにすること
もできる。Further, the thermoplastic resin sheet bending device may include a plurality of heating members and a plurality of bending members, respectively, and at least two ends of the thermoplastic resin sheet may be bent at the same time.
［実施例］ 実施例について図面を参照して説明する。[Examples] Examples will be described with reference to the drawings.
第１図及び第２図は、本発明に係る折曲装置であり、当
該装置は、熱可塑性樹脂シート１を載置する載置台２
と、該載置台２に移動可能に設けられた熱可塑性樹脂シ
ート１を加熱する加熱部材８と、熱可塑性樹脂シートの
折曲部の折曲厚を規定する規制板４と、該規制板４に沿
って熱可塑性樹脂シート１を折り曲げる折曲部材５と、
該折曲部材５の上部に設けられた熱可塑性樹脂シート１
の位置決め部材３と、上記折曲部材５、加熱部材８及び
規正板４を動かす油圧や空気圧により作動するアクチュ
エータ11、12、13、14とからなっている。FIG. 1 and FIG. 2 show a folding device according to the present invention, which is a mounting table 2 on which a thermoplastic resin sheet 1 is mounted.
A heating member 8 movably provided on the mounting table 2 for heating the thermoplastic resin sheet 1, a regulation plate 4 for regulating the bending thickness of the bent portion of the thermoplastic resin sheet, and the regulation plate 4 A bending member 5 for bending the thermoplastic resin sheet 1 along the
Thermoplastic resin sheet 1 provided on the folding member 5
The positioning member 3 and the actuators 11, 12, 13, and 14 which are operated by hydraulic pressure or air pressure to move the bending member 5, the heating member 8 and the train wheel 4.
本発明の方法を第３図及び第４図に基づいて説明する
と、まず、第３図（ａ）に示すように、折り曲げを目的
とする熱可塑性樹脂シート１を載置台２上に載せ、当該
熱可塑性樹脂シート１を折曲部材５に設けた位置決め部
材３を使用し、アクチュエータ12を操作することにより
所定位置に設置する。つぎに、第３図（ｂ）及び第４図
に示すように、規正板４をアクチュエータ14を操作して
熱可塑性樹脂シート１の上部に重ね、これによって、熱
可塑性樹脂シート１が動かないように固定する。そし
て、断面コ状の端部10を有する加熱部材８をアクチュエ
ータ13を操作して熱可塑性樹脂シート１の折曲部６に当
接させて当該熱可塑性樹脂シート１の折曲線７上を加熱
する。ついで、第３図（ｃ）に示すように、折曲部材５
をアクチュエータ11を操作して折曲部材５の下面が熱可
塑性樹脂シート１の折曲部６の厚さと同じになる位置ま
で上昇させる。これによって、熱可塑性樹脂シート１は
規正板４側の折曲線７に沿って折り曲げられることとな
る。その後、第３図（ｄ）に示すように、折曲部材５を
アクチュエータ12を操作して水平に移動させることによ
り、熱可塑性樹脂シート１の１端面が折曲部６をはさん
で当該熱可塑性樹脂シート面とほぼ水平になるよう折り
曲げる。この折り曲げは、規正板４に沿って行われるの
で、折曲部６は、規正板４の外形に沿った断面コ状に精
度よく形成される。なお、この工程が終了した後、折曲
部材５でアクチュエータ11を操作して熱可塑性樹脂シー
ト１を上方より押圧すると、さらに折曲部６の寸法精度
が良くなる。The method of the present invention will be described with reference to FIGS. 3 and 4. First, as shown in FIG. 3 (a), the thermoplastic resin sheet 1 intended for bending is placed on the placing table 2 and The positioning member 3 provided with the thermoplastic resin sheet 1 on the bending member 5 is used, and the actuator 12 is operated to set the thermoplastic resin sheet 1 at a predetermined position. Next, as shown in FIG. 3 (b) and FIG. 4, the train wheel 4 is placed on the upper portion of the thermoplastic resin sheet 1 by operating the actuator 14, so that the thermoplastic resin sheet 1 does not move. Fixed to. Then, the heating member 8 having the end portion 10 having a U-shaped cross section is operated to contact the bent portion 6 of the thermoplastic resin sheet 1 by operating the actuator 13 to heat the folding line 7 of the thermoplastic resin sheet 1. . Then, as shown in FIG. 3 (c), the bending member 5
The actuator 11 is operated to raise the lower surface of the bending member 5 to the position where the thickness of the bending portion 6 of the thermoplastic resin sheet 1 becomes the same. As a result, the thermoplastic resin sheet 1 is folded along the folding curve 7 on the train wheel 4 side. After that, as shown in FIG. 3 (d), the bending member 5 is moved horizontally by operating the actuator 12, so that one end surface of the thermoplastic resin sheet 1 sandwiches the bending portion 6 and the heat is generated. Bend it so that it is almost horizontal with the plastic resin sheet surface. Since this bending is performed along the train wheel setting plate 4, the bent portion 6 is accurately formed in a U-shaped cross section along the outer shape of the train wheel setting plate 4. After the completion of this step, if the bending member 5 operates the actuator 11 to press the thermoplastic resin sheet 1 from above, the dimensional accuracy of the bent portion 6 is further improved.
以上、熱可塑性樹脂シート１の１端を折り曲げる方法に
ついて説明したが、第２図に示すように、加熱部材８及
び折曲部材５をそれぞれ複数備え、熱可塑性樹脂シート
１の少なくとも２端を同時に折り曲げるようにすること
も可能である。なお、方形の熱可塑性樹脂シート１の４
端を同時に折り曲げる際には、第６図に示すように規正
板４を分割して構成しておき、熱可塑性樹脂シート１の
成型後取り外すことができるようにしておく必要があ
る。The method for bending one end of the thermoplastic resin sheet 1 has been described above. However, as shown in FIG. 2, a plurality of heating members 8 and a plurality of bending members 5 are provided, and at least two ends of the thermoplastic resin sheet 1 are simultaneously formed. It is also possible to bend. In addition, 4 of the square thermoplastic resin sheet 1
When the ends are bent at the same time, it is necessary to divide the regulation plate 4 as shown in FIG. 6 so that it can be removed after molding the thermoplastic resin sheet 1.
本発明に用いられる加熱部材８は、第５図に示すような
形状、構造を有するものであり、加熱部材端部10は、熱
可塑性樹脂シート１の折曲線７上を加熱できるように、
断面コ状をしている。加熱部材８の厚さｔは、規正板４
の厚さとほぼ等しくすることが好ましく、また、加熱部
材端部10の加熱部の厚さt1は、加熱部材８の厚さｔが5m
mの場合には、0.5mm程度とするのが適当であるが、これ
は、熱可塑性樹脂シート１の材質及びシートの厚さ、折
曲部６の厚さ、外気温度等により調整するのが好まし
い。また、加熱部材８には、その適宜の位置に加熱部材
８を内部から加熱するためのヒータ９が埋設されてい
る。ヒータ９には、シーズヒータ、棒状ヒータ等を用い
るのが適当である。The heating member 8 used in the present invention has a shape and structure as shown in FIG. 5, and the heating member end portion 10 can heat the fold line 7 of the thermoplastic resin sheet 1,
It has a U-shaped cross section. The thickness t of the heating member 8 is equal to
It is preferable that the thickness t 1 of the heating portion of the heating member end 10 is 5 m.
In the case of m, it is suitable to set it to about 0.5 mm, but this is adjusted by the material of the thermoplastic resin sheet 1 and the thickness of the sheet, the thickness of the bent portion 6, the outside air temperature, etc. preferable. A heater 9 for heating the heating member 8 from the inside is embedded in the heating member 8 at an appropriate position. It is suitable to use a sheathed heater, a rod-shaped heater, or the like as the heater 9.
本発明方法及び装置で製造された熱可塑性樹脂シート製
品を第７図に示す。本発明が適用できる熱可塑性樹脂シ
ートとしては、硬質又は半硬質の熱可塑性樹脂シート、
例えば、ポリ塩化ビニル、塩素化塩化ビニル樹脂、ポリ
ビニルアルコール、酢酸ビニル、ポリプロピレン等の合
成樹脂シートがあり、また、当該熱可塑性樹脂シートの
シートの厚さには特に制限はないが、0.05〜2.0mmの厚
さのものが好ましい。A thermoplastic resin sheet product produced by the method and apparatus of the present invention is shown in FIG. As the thermoplastic resin sheet to which the present invention can be applied, a rigid or semi-rigid thermoplastic resin sheet,
For example, polyvinyl chloride, chlorinated vinyl chloride resin, polyvinyl alcohol, vinyl acetate, there is a synthetic resin sheet such as polypropylene, the thickness of the thermoplastic resin sheet is not particularly limited, 0.05 ~ 2.0 Those with a thickness of mm are preferred.
［発明の効果］ 本発明の熱可塑性樹脂シートの折曲方法及び折曲装置に
よれば、熱可塑性樹脂シートの２本の折曲線上のみを同
時に加熱した後、熱可塑性樹脂シートの加熱した部分が
内側となるように折り曲げているため、折り曲げを精度
よく行うことができ、また、折曲部が白化せず、さら
に、折曲部の表面側は直接加熱されないため、変形や傷
による引っかかりがなく、見栄えもよい上、強度的にも
優れている。また、製品の製造を短時間で行うことがで
き、特に同時に複数箇所の折り曲げを行うことも可能で
あり、作業効率を向上することができる。さらに、本発
明の熱可塑性樹脂シートの折曲方法及び折曲装置は、種
々の材質、厚さの硬質又は半硬質の熱可塑性樹脂シート
に適用可能である。[Effects of the Invention] According to the folding method and the folding apparatus of the thermoplastic resin sheet of the present invention, after heating only two folding curves of the thermoplastic resin sheet at the same time, the heated portion of the thermoplastic resin sheet Since it is bent so that it is on the inside, the bending can be performed accurately, and the bent part does not whiten and the surface side of the bent part is not directly heated, so it is not caught by deformation or scratches. Not only does it look good, it is also excellent in strength. In addition, the product can be manufactured in a short time, and in particular, it is possible to bend at a plurality of positions at the same time, which can improve the work efficiency. Furthermore, the method and apparatus for bending a thermoplastic resin sheet of the present invention can be applied to hard or semi-rigid thermoplastic resin sheets of various materials and thicknesses.
これらのことから、本発明に係る熱可塑性樹脂シートの
折曲方法及び折曲装置は、例えば、各種包装用ケースの
ほかプラスチック封筒、レコードジャケット、カレンダ
ーケース等の製造に広く使用することが可能である。From these facts, the folding method and the folding apparatus for the thermoplastic resin sheet according to the present invention can be widely used, for example, in the production of various packaging cases as well as plastic envelopes, record jackets, calendar cases and the like. is there.
第１図は本発明に係る熱可塑性樹脂シートの折曲装置の
要部正面図、第２図は同全体正面図、第３図は本発明に
よる熱可塑性樹脂シートの折曲方法の工程図、第４図は
同工程のうち加熱工程の詳細工程図、第５図は本発明に
使用される加熱部材の正面図、第６図は本発明に使用さ
れる規正版の実施例を示す平面図、第７図は本発明方法
及び装置で製造された熱可塑性樹脂シート製品の斜視図
及びその断面図である。 １……熱可塑性樹脂シート ２……載置台 ３……位置決め部材 ４……規正板 ５……折曲部材 ６……折曲部 ７……折曲線 ８……加熱部材 ９……ヒータ 10……加熱部材端部 11、12、13、14……アクチュエータFIG. 1 is a front view of a main part of a folding device for a thermoplastic resin sheet according to the present invention, FIG. 2 is a front view of the same, and FIG. 3 is a process diagram of a method for folding a thermoplastic resin sheet according to the present invention. FIG. 4 is a detailed process drawing of the heating process in the same process, FIG. 5 is a front view of a heating member used in the present invention, and FIG. 6 is a plan view showing an embodiment of a standard plate used in the present invention. FIG. 7 is a perspective view and a sectional view of a thermoplastic resin sheet product manufactured by the method and apparatus of the present invention. 1 ... Thermoplastic resin sheet 2 ... Mounting table 3 ... Positioning member 4 ... Regulation plate 5 ... Bending member 6 ... Bending part 7 ... Folding curve 8 ... Heating member 9 ... Heater 10 ... ... Ends of heating members 11, 12, 13, 14 ... Actuator
Claims (3)
り曲げる際に、熱可塑性樹脂シート（１）の２本の折曲
線（７）上のみを同時に加熱した後、該熱可塑性樹脂シ
ート（１）の加熱した部分が内側となるように熱可塑性
樹脂シート（１）の一端面が折曲部（６）をはさんで当
該熱可塑性樹脂シートとほぼ平行になるまで折り曲げる
ことを特徴とする熱可塑性樹脂シートの折曲方法。1. When the thermoplastic resin sheet (1) is bent in a U-shaped cross section, only the two folding curves (7) of the thermoplastic resin sheet (1) are heated at the same time, and the thermoplastic resin sheet is then heated. The one end surface of the thermoplastic resin sheet (1) is bent so that the heated portion of (1) is placed inside the bent portion (6) so as to be substantially parallel to the thermoplastic resin sheet. Method for bending thermoplastic resin sheet.
と、該載置台（２）に移動可能に設けられた熱可塑性樹
脂シート（１）の２本の折曲線（７）上のみを同時に加
熱する加熱部材（８）と、熱可塑性樹脂シート（１）の
折曲部（６）の厚さを規制する規制板（４）と、該規制
板（４）に沿って前記熱可塑性樹脂シート（１）の加熱
した部分が内側となるように熱可塑性樹脂シート（１）
を折り曲げる折曲部材（５）とからなることを特徴とす
る熱可塑性樹脂シートの折曲装置。2. A mounting table (2) for a thermoplastic resin sheet (1).
A heating member (8) for simultaneously heating only the two folding curves (7) of the thermoplastic resin sheet (1) movably provided on the mounting table (2), and the thermoplastic resin sheet (1) (4) for regulating the thickness of the bent portion (6), and the thermoplastic so that the heated portion of the thermoplastic resin sheet (1) along the regulation plate (4) is on the inside. Resin sheet (1)
A folding device (5) for folding a thermoplastic resin sheet.
それぞれ複数備え、熱可塑性樹脂シート（１）の少なく
とも２端を同時に折り曲げるようにしたことを特徴とす
る請求項２記載の熱可塑性樹脂シートの折曲装置。3. The heating member (8) and the bending member (5) are each provided in plurality, and at least two ends of the thermoplastic resin sheet (1) are bent at the same time. Bending device for thermoplastic resin sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2166420A JPH0780237B2 (en) | 1990-06-25 | 1990-06-25 | Bending method and folding device for thermoplastic resin sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2166420A JPH0780237B2 (en) | 1990-06-25 | 1990-06-25 | Bending method and folding device for thermoplastic resin sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0499614A JPH0499614A (en) | 1992-03-31 |
| JPH0780237B2 true JPH0780237B2 (en) | 1995-08-30 |
Family
ID=15831097
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2166420A Expired - Lifetime JPH0780237B2 (en) | 1990-06-25 | 1990-06-25 | Bending method and folding device for thermoplastic resin sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0780237B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103448236A (en) * | 2013-09-04 | 2013-12-18 | 苏州雅妮服务外包有限公司 | Novel acrylic bending machine |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE1014358A5 (en) * | 2001-09-04 | 2003-09-02 | Euro Shadow Construct Machb | Border locking device, especially for carpets, comprises ultrasonic heating device and pressure application device |
| KR100449542B1 (en) * | 2002-02-08 | 2004-09-22 | (주) 대경프라스틱 | a |
| KR100751711B1 (en) * | 2006-08-24 | 2007-08-23 | 주식회사 휘닉스 디지탈테크 | Tape auto folding attachment system |
| JP2011095707A (en) * | 2009-09-29 | 2011-05-12 | Sekisui Plastics Co Ltd | Method of folding light reflection sheet and light reflection plate |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5363358U (en) * | 1976-10-27 | 1978-05-29 | ||
| US4294640A (en) * | 1979-12-12 | 1981-10-13 | Verbatim Corporation | Forming process for light gauge polymer sheet material |
| JPS60210424A (en) * | 1984-04-04 | 1985-10-22 | Denki Kagaku Kogyo Kk | Method and apparatus for bending thermoplastic resin sheet and box making process |
-
1990
- 1990-06-25 JP JP2166420A patent/JPH0780237B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103448236A (en) * | 2013-09-04 | 2013-12-18 | 苏州雅妮服务外包有限公司 | Novel acrylic bending machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0499614A (en) | 1992-03-31 |
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