JPH0216027A - Method of ruling plastic sheet - Google Patents
Method of ruling plastic sheetInfo
- Publication number
- JPH0216027A JPH0216027A JP16726788A JP16726788A JPH0216027A JP H0216027 A JPH0216027 A JP H0216027A JP 16726788 A JP16726788 A JP 16726788A JP 16726788 A JP16726788 A JP 16726788A JP H0216027 A JPH0216027 A JP H0216027A
- Authority
- JP
- Japan
- Prior art keywords
- plastic sheet
- ruling
- section
- blade
- molding
- 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
- 239000002985 plastic film Substances 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims description 13
- 238000000465 moulding Methods 0.000 claims abstract description 17
- 229920001971 elastomer Polymers 0.000 claims abstract description 12
- 239000005060 rubber Substances 0.000 claims abstract description 12
- 238000003825 pressing Methods 0.000 claims description 11
- 238000009826 distribution Methods 0.000 abstract description 8
- 229920000459 Nitrile rubber Polymers 0.000 abstract description 2
- 239000004033 plastic Substances 0.000 description 15
- 229920003023 plastic Polymers 0.000 description 15
- 238000007666 vacuum forming Methods 0.000 description 5
- 238000005520 cutting process Methods 0.000 description 4
- 239000004794 expanded polystyrene Substances 0.000 description 4
- 229920006248 expandable polystyrene Polymers 0.000 description 3
- 238000003856 thermoforming Methods 0.000 description 3
- 241000723438 Cercidiphyllum japonicum Species 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 235000013601 eggs Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229920005669 high impact polystyrene Polymers 0.000 description 1
- 239000004797 high-impact polystyrene Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 235000013372 meat Nutrition 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920006327 polystyrene foam Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
Landscapes
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は１例えば蓋付プラスチック容器を熱成形により
一体成形する際にプラスチック容器の本体部と蓋部との
接続部分（ヒンジ部分）に均一に罫線を付ける。あるい
は発泡プラスチックシートをマツチドダイで熱成形する
とともにヒンジを形成させて組立箱を成形する等のプラ
スチックシートの罫線付与方法に間するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention has the following features: 1. For example, when a plastic container with a lid is integrally molded by thermoforming, the connecting portion (hinge portion) between the main body and the lid of the plastic container is uniformly formed. Add borders to. Alternatively, the present invention is an alternative to a method of providing ruled lines to a plastic sheet, such as thermoforming a foamed plastic sheet with a mated die and forming a hinge to form an assembly box.
「従来の技術１
従来、卵、肉などを入れるプラスチック容器では、ポリ
塩化ビニルシート、ハイインパクトポリスチレンシート
、発泡ポリスチレンペーパー（ＰＳＰ）等熱可塑性プラ
スチックスのシートから。``Conventional Technology 1'' Conventionally, plastic containers for storing eggs, meat, etc., have been made of thermoplastic sheets such as polyvinyl chloride sheets, high-impact polystyrene sheets, and expanded polystyrene paper (PSP).
真空成形や圧空成形、マツチドタイ成形等の熱成形によ
り、蓋の部分をプラスチック容器本体と一体に成形する
と共に、容器本体部と蓋部との接続部に折り曲げ自在な
ヒンジ部を形成するために、該接続部分に罫線を付けて
いる。この罫線により容器本体部と蓋部のヒンジ部を折
り曲げ易くしている。In order to form the lid part integrally with the plastic container body by thermoforming such as vacuum forming, pressure forming, matt tie molding, etc., and to form a bendable hinge part at the connection between the container body and the lid, A ruled line is attached to the connecting portion. These ruled lines make it easy to bend the hinges of the container body and lid.
このような容器本体部と蓋部との接続部分に罫線を付け
てヒンジ部を形成した蓋付プラスチック容器は、一般に
広幅のプラスチックシートより多数個同時に熱成形・罫
線付けされ１次のトリミング工程で型抜きされて製造さ
れている。又、成形、罫線付けと共に型抜きも同ステー
ジで行なわれることもある。Such plastic containers with lids, in which a hinge is formed by adding ruled lines to the connecting part between the container body and the lid, are generally made of a wide plastic sheet, and are thermoformed and ruled in large numbers at the same time in the first trimming process. Manufactured by die cutting. In addition, mold cutting may be performed on the same stage as forming and marking.
該ヒンジ部には、このような罫線付けの際に該シートの
上方に配設される雄金型、雌金型に固着した１山又２山
の山型状（１）の剛体（例えばステンレス）の罫刃なプ
ラスチックシートの罫線を付与すべき位置に押圧するこ
とによって罫線を形成させ、容器本体部と蓋部とをこの
罫線部分で折り曲げることを容易にしている。The hinge part has one or two chevron-shaped (1) rigid bodies (for example, stainless steel) fixed to the male and female molds disposed above the sheet when making such ruled lines. ) The ruled line is formed by pressing the plastic sheet at the position where the ruled line is to be applied, making it easy to bend the container body and the lid at the ruled line portion.
［発明が解決しようとする課題］
しかしながら、シート幅が６０ｃｍ〜２ｍの広幅のプラ
スチックシート自体には肉厚分布において±１５％の厚
薄があり、また、成形用金型が多数個取りの場合は金型
にも精度不良によるバラツキがあり、実際上、広幅のプ
ラスチックシート全体に成形される多数の容器の夫々に
必要な深さの罫線を付与することは必ずしも容易ではな
かった０時にプラスチックシートがＰＳＰや発泡ポリプ
ロピレンシートのときには罫線の付与が難しく、ロス品
が多くなる。[Problem to be solved by the invention] However, the wide plastic sheet itself with a sheet width of 60 cm to 2 m has a thickness distribution of ±15%, and when the mold has multiple molds, Molds also have variations due to poor precision, and in practice, it is not always easy to create ruled lines of the necessary depth for each of the many containers that are molded across a wide plastic sheet. When using PSP or foamed polypropylene sheets, it is difficult to add ruled lines, resulting in many lost items.
したがって、これらプラスチックシートの一部には罫線
の浅い容器が形成され、そのような容器ではヒンジ部を
容易に折り曲げることができず。Therefore, containers with shallow lines are formed in some of these plastic sheets, and the hinge portions of such containers cannot be easily bent.
無理に折り曲げようとすると、蓋付プラスチック容器の
本体部分で折れ曲がって容器本体に折れ線が付いたり、
場合によっては折れ曲がった部分で破れたりするなど、
蓋付プラスチック容器の品質不良や製品歩留りの低下の
原因となっていた。If you try to bend it forcibly, the main body of the plastic container with a lid may bend and create a crease line on the container body.
In some cases, it may break at the bent part, etc.
This caused poor quality of plastic containers with lids and decreased product yield.
その対策としては、成形機の型締力を２〜３倍に大きく
したり、金型の加工精度を著しく向上させたり、シート
押出成形時のシートの熱分布をできるだけコントロール
してシートの肉厚分布を一層均一にするなどの手段が講
じられてきたが、これらの方法は技術的にも解決し難い
点があったり、また、全型代や装置費用の点から製造コ
スト上の問題があった。Countermeasures include increasing the mold clamping force of the molding machine by two to three times, significantly improving the machining accuracy of the mold, and controlling the heat distribution of the sheet during sheet extrusion molding as much as possible to increase the thickness of the sheet. Measures have been taken to make the distribution more uniform, but these methods have problems that are technically difficult to solve, and also pose problems in manufacturing costs due to the cost of the entire mold and equipment. Ta.
［課題を解決するための手段］
本発明は上記課題に鑑みて鋭意研究した結果なされたも
ので、すなわち、罫刃を備えた成形用マツチドタイ金型
をプラスチックシートに押圧することによって、プラス
チックシートを成形すると共に、該罫刃によって蓋付プ
ラスチックシートに罫線を付与してヒンジ部を形成する
プラスチックシートの罫線付与方法において、前記罫刃
の基端部側に弾発体を配設した成形用金型を用いること
を特徴とするプラスチックシートの罫線付与方法である
。[Means for Solving the Problems] The present invention was made as a result of intensive research in view of the above-mentioned problems. That is, by pressing a molding matte tie mold equipped with ruled blades against a plastic sheet, a plastic sheet can be molded. In a method for forming a ruled line on a plastic sheet, in which a hinge portion is formed by applying ruled lines to a plastic sheet with a lid using the ruled blade, the molding metal is provided with an elastic body on the proximal end side of the ruled blade. This is a method for providing ruled lines on a plastic sheet, which is characterized by using a mold.
罫刃の基端部側に配設される弾発体としては、罫刃全体
に一定の押圧力を与えるものであれば任意の弾性体が用
い得る６例えば、コイルばね、板ばね又は弾性ゴムを罫
刃の端部及び中間部に適宜配設することができる０弾性
ゴムは柱状、球状、円筒状等を用いることができる。ま
た、罫刃の基部全体にわたって、波板状の板ばね又はチ
ュウブ状の弾性ゴムを置いてもよい０弾性ゴムを用いる
場合には、金型の加熱により容易に劣化しない耐熱性ゴ
ムが用いられる。As the elastic body disposed on the base end side of the scoring blade, any elastic body can be used as long as it applies a constant pressing force to the entire scoring blade 6 For example, a coil spring, a leaf spring, or an elastic rubber. The elastic rubber, which can be appropriately disposed at the ends and intermediate portions of the ruling blade, can be columnar, spherical, cylindrical, or the like. Additionally, a corrugated leaf spring or tube-like elastic rubber may be placed over the entire base of the ruled blade.When using zero elastic rubber, a heat-resistant rubber that does not deteriorate easily due to heating of the mold is used. .
［作用］
罫刃の基端部側に配設されるゴム又はスプリングなどの
弾発体は、罫刃なゴム又はスプリングなどの一定の弾発
力によって押圧するので、雄金型または雌金型を押し下
げて、罫刃をプラスチックシートに押圧した際に、該プ
ラスチックシートの幅方向の肉厚分布に厚薄があっても
、あるいは、金型の精度不良などによって雌雄両全型の
間隔蓚こ若干の変動が生じても、罫刃はプラスチックシ
ートに一定の押圧力で押すことができる。[Operation] An elastic body such as rubber or a spring disposed on the proximal end side of the scoring blade is pressed by a certain elastic force of the rubber or spring, so the male mold or female mold When pressing down and pressing the scoring blade against the plastic sheet, even if the thickness distribution in the width direction of the plastic sheet is thick and thin, or due to poor precision of the mold, the spacing between the male and female molds may be slightly different. Even if fluctuations occur, the scoring blade can press against the plastic sheet with a constant pressing force.
したがって、軟化乃至溶融したプラスチックシートに押
圧されて侵入した罫刃は、その先端がプラスチックシー
トの反対面の雌金型と接触して軟化点以下となった樹脂
部分により押圧力に釣合う抵抗を受ける点まで侵入し、
ヒンジ部として必要な厚さを残して罫線（ヒンジ溝）を
形成する。Therefore, when the scoring blade enters the softened or melted plastic sheet by being pressed, its tip comes into contact with the female mold on the opposite side of the plastic sheet, and the resin part whose temperature is below the softening point provides resistance that balances the pressing force. penetrate to the point where it is received,
A ruled line (hinge groove) is formed leaving the necessary thickness for the hinge part.
［実施例］
本発明の蓋付プラスチック容器の罫線付与方法を以下に
実施例を挙げて具体的に説明する。[Example] The method for providing ruled lines on a plastic container with a lid according to the present invention will be specifically described below with reference to Examples.
第１図は成形及び罫線付与前の成形用マツチドダイ金型
上に配設した加熱され、軟化乃至溶融状態のプラスチッ
クシートの断面図であり、第２図は成形及び罫線付与後
の成形用金型及び蓋付プラスチック容器の断面図である
。Figure 1 is a cross-sectional view of a plastic sheet in a heated, softened or molten state placed on a matte die mold for molding before molding and scoring, and Figure 2 is a cross-sectional view of the plastic sheet after molding and scoring. and a sectional view of a plastic container with a lid.
第１図において、ｌは減圧用の孔２を備えた真空成形用
雌金型３土に配設した発泡ポリスチレン製プラスチック
シート、いわゆるＰＳＰである。In FIG. 1, 1 is a plastic sheet made of foamed polystyrene, so-called PSP, placed in a female vacuum mold 3 having holes 2 for depressurization.
該発泡ポリスチレン製プラスチックシートｌの成形は、
真空成形用雌金型３のバイブ１３をコンプレッサーによ
り減圧し、チャンバー１４を減圧することにより、この
チャンバーと連通する孔２よりキャビティー４内を減圧
にすると共に、軟化乃至溶融した発泡ポリスチレン製プ
ラスチックシートｌの上方に配設される雄金型５を第２
図に示すように押し下げて、発泡ポリスチレン製プラス
チックシートｌを押圧することにより容器本体部６と蓋
部７とが凹状に形成された蓋付プラスチック容器８が成
形される。The molding of the expanded polystyrene plastic sheet l is as follows:
By depressurizing the vibrator 13 of the female mold 3 for vacuum forming with a compressor and depressurizing the chamber 14, the pressure inside the cavity 4 is reduced through the hole 2 communicating with this chamber, and the softened or melted polystyrene foam plastic is removed. The male mold 5 disposed above the sheet l is
As shown in the figure, by pressing down the foamed polystyrene plastic sheet 1, a plastic container 8 with a lid in which the container main body 6 and the lid 7 are formed in a concave shape is formed.
この雄金型５を押し下げた際に、雄金型５の外周部分に
形成されている凸条部（型抜刃）９ａ。When this male die 5 is pushed down, a convex strip (die cutting blade) 9a is formed on the outer circumferential portion of the male die 5.
９ｂが真空成形用雌金型３に押圧されることよって、前
記蓋付プラスチック容器８は発泡ポリスチレン製プラス
チックシートｌより容器本体部６と蓋部７とが′接続部
１０により接続されている状態で型抜き成形される。な
お、製品の型抜きは、真空成形後に別工程で行なっても
よい。9b is pressed against the female mold 3 for vacuum forming, the plastic container 8 with a lid is in a state where the container body 6 and the lid 7 are connected by the connecting part 10 through the expanded polystyrene plastic sheet l. It is molded and molded. Note that the mold cutting of the product may be performed in a separate process after vacuum forming.
このとき、前記雄金型５の中央部に上下に摺動自在に固
着されるヒンジ形成装置１１の罫刃１１ａが容器本体部
６と蓋部７とを接続するプラスチックシートの接続部１
０位置に押圧され、罫刃１１ａの先端形状のＶ型又はＷ
型などの、模様の罫線がプラスチックシートの接続部ｌ
Ｏに付与されてヒンジ部が成形される。At this time, the ruling blade 11a of the hinge forming device 11, which is fixed to the center of the male mold 5 so as to be slidable up and down, connects the connecting portion 1 of the plastic sheet that connects the container body 6 and the lid 7.
When pressed to the 0 position, the tip of the scoring blade 11a is V-shaped or W-shaped.
The ruled lines of the pattern, such as molds, are the connecting parts of the plastic sheet.
O is applied to form the hinge part.
該罫刃１１ａは、その基端部１１ｂ側にアクリルニトリ
ル・ブタジェンゴムなどをリング状に形成したゴム又は
スプリングなどの弾発体１２が配設されているので、成
形時にヒンジ部での雄金型５と雌金型３との間隔如何に
拘らず、また、発泡ポリスチレン製プラスチックシート
ｌの幅方向の肉厚分布に厚薄があっても、罫刃１１ａは
シートに一定の押圧力で押圧されるので、ヒンジ部に必
要な厚みを残して罫線を成形することができる。The rule blade 11a has an elastic body 12 such as a ring-shaped rubber or spring made of acrylonitrile-butadiene rubber formed on the base end 11b side thereof, so that the male mold at the hinge portion is 5 and the female mold 3, and even if there is a thickness distribution in the width direction of the expanded polystyrene plastic sheet l, the scoring blade 11a is pressed against the sheet with a constant pressing force. Therefore, the ruled line can be formed while leaving the required thickness at the hinge part.
［発明の効果］
本発明の蓋付プラスチックシートの罫線付与方法におい
ては、罫刃の基端部側に配設されるゴム又はスプリング
などの弾発体１２が、罫刃１１ａを一定の弾発力によっ
て発泡ポリスチレン製プラスチックシートを押圧するこ
とができるので、プラスチックシートの幅方向の肉厚分
布があっても、あるいは、金型に精度不良などによって
雌雄金型の間隔に若干の変動が生じても、罫刃はプラス
チックシートに均一な押圧力で押圧することができ、ヒ
ンジ部に必要な深さの罫線を形成させることができる。[Effects of the Invention] In the method for providing ruled lines on a plastic sheet with a lid of the present invention, the resilient body 12 such as rubber or a spring provided on the base end side of the ruled blade gives a certain resilient force to the ruled blade 11a. Since the foamed polystyrene plastic sheet can be pressed by force, it can be used even if there is a thickness distribution in the width direction of the plastic sheet, or if there is slight variation in the spacing between the male and female molds due to poor mold precision. Also, the ruling blade can press the plastic sheet with a uniform pressing force, and can form ruled lines of the necessary depth at the hinge portion.
なお、第１図では、弾発体１２としてバネを例示したが
、これは第３図に示すように弾発体のリング状のゴム棒
１２であってもよい。In addition, in FIG. 1, a spring is illustrated as the elastic body 12, but this may be a ring-shaped rubber rod 12 of the elastic body as shown in FIG.
本発明の方法によれば、広幅のプラスチックシート全体
に配設された多数個の蓋付プラスチック容器の成形金型
の精度を特に向上させなくても、成形された蓋付容器の
ヒンジ部に均一で、かつ、有効な深さの罫線を付与する
ことができる。According to the method of the present invention, the hinge portion of the molded lidded container can be uniformly formed without particularly improving the precision of the mold for forming a large number of lidded plastic containers arranged over the entire wide plastic sheet. , and it is possible to provide ruled lines with an effective depth.
第１図は成形及び罫線付与前の成形用金型上に配設した
プラスチックシートの断面図であり、第２図は成形及び
罫線付与後の成形用金型及び蓋付プラスチック容器の断
面図、第３図はヒンジ形成装置の部分断面図である。
ｌニブラスチックシート
２：減圧用孔 ３：真空成形用雌金型４：キャビ
ティ−５：雄金型
６：容器本体部 ７：Ｍ部
８：蓋付プラスチック容器
９ａ、９ｂ：凸条部（型抜刃）
ｌＯ：接続部 ｌｌ：ヒンジ形成装置１１ａ：罫
刃 １１ｂ：基端部
１２：弾発体
出願人 三菱油化バーデイツシエ株式会社代理人 弁理
士 厚 １）桂 一部FIG. 1 is a cross-sectional view of a plastic sheet placed on a molding die before molding and scoring, and FIG. 2 is a cross-sectional view of a molding die and a plastic container with a lid after molding and scoring, FIG. 3 is a partial cross-sectional view of the hinge forming device. l Niblastic sheet 2: Decompression hole 3: Female mold for vacuum forming 4: Cavity 5: Male mold 6: Container body 7: M part 8: Plastic container with lid 9a, 9b: Convex strips (mold (extraction blade) lO: Connecting portion ll: Hinge forming device 11a: Ruler blade 11b: Base end portion 12: Elastic body Applicant Mitsubishi Yuka Verdice Co., Ltd. Agent Patent attorney Atsushi 1) Katsura Part
Claims (2)
融着プラスチックシートに押圧することによって、プラ
スチックシートを熱成形すると共に、該罫刃によってプ
ラスチックシートに罫線を付与してヒンジ部を形成する
シートの罫線付与方法において、前記罫刃の基端部側に
弾発体を配設した成形用金型を用いることを特徴とする
プラスチックシートの罫線付与方法。(1) The plastic sheet is thermoformed by pressing a molding matched die equipped with a ruled blade against the softened or fused plastic sheet, and the ruled blade adds ruled lines to the plastic sheet to form a hinge part. 1. A method for providing ruled lines on a plastic sheet, the method comprising: using a molding die in which a resilient body is disposed on the proximal end side of the ruling blade.
載のプラスチックシートの罫線付与方法。(2) The method for providing ruled lines on a plastic sheet according to claim 1, wherein the elastic body is rubber or a spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16726788A JPH0216027A (en) | 1988-07-04 | 1988-07-04 | Method of ruling plastic sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16726788A JPH0216027A (en) | 1988-07-04 | 1988-07-04 | Method of ruling plastic sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0216027A true JPH0216027A (en) | 1990-01-19 |
Family
ID=15846568
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16726788A Pending JPH0216027A (en) | 1988-07-04 | 1988-07-04 | Method of ruling plastic sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0216027A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010168068A (en) * | 2009-01-22 | 2010-08-05 | Chuo Kagaku Co Ltd | Packaging container and its manufacturing method |
| JP2011500386A (en) * | 2007-10-23 | 2011-01-06 | エルペツェ、ベボ−プラスティク、ゲゼルシャフト、ミット、ベシュレンクテル、ハフツング | Method for producing thermoformed article and instrument for its production |
-
1988
- 1988-07-04 JP JP16726788A patent/JPH0216027A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011500386A (en) * | 2007-10-23 | 2011-01-06 | エルペツェ、ベボ−プラスティク、ゲゼルシャフト、ミット、ベシュレンクテル、ハフツング | Method for producing thermoformed article and instrument for its production |
| JP2010168068A (en) * | 2009-01-22 | 2010-08-05 | Chuo Kagaku Co Ltd | Packaging container and its manufacturing method |
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