JPH031927A - Vacuum molding method - Google Patents
Vacuum molding methodInfo
- Publication number
- JPH031927A JPH031927A JP13666889A JP13666889A JPH031927A JP H031927 A JPH031927 A JP H031927A JP 13666889 A JP13666889 A JP 13666889A JP 13666889 A JP13666889 A JP 13666889A JP H031927 A JPH031927 A JP H031927A
- Authority
- JP
- Japan
- Prior art keywords
- sheet
- recess
- container
- mold
- plug
- 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
- 238000000034 method Methods 0.000 title claims description 17
- 238000000465 moulding Methods 0.000 title description 4
- 229920005992 thermoplastic resin Polymers 0.000 claims abstract description 7
- 238000007666 vacuum forming Methods 0.000 claims description 7
- 230000002093 peripheral effect Effects 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 6
- 239000010409 thin film Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 208000006888 Agnosia Diseases 0.000 description 1
- 241001047040 Agnosia Species 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 210000004907 gland Anatomy 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2791/00—Shaping characteristics in general
- B29C2791/004—Shaping under special conditions
- B29C2791/006—Using vacuum
Landscapes
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、熱可塑性樹脂を用いて、偏肉の少ない複数の
容器等の成形品を同時成形する真空成形方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vacuum forming method for simultaneously molding a plurality of molded products such as containers with small thickness deviation using a thermoplastic resin.
一般に容器等の成形品（以下容器という）を真空成形す
るには、ポリススチレン、ポリエチレン、ポリプロピレ
ン等の熱可塑性樹脂シートを加熱軟化し、これを多数の
四部が縦（黄に並んで形成されている金型上に載置し、
上金型で押え、真空に引いてシートを凹部内面に密着せ
しめ、−回の操作で多数の容器を成形している。Generally, in order to vacuum form a molded product such as a container (hereinafter referred to as a container), a thermoplastic resin sheet such as polystyrene, polyethylene, or polypropylene is heated and softened, and a large number of four parts are formed vertically (yellow). Place it on the mold with
A large number of containers are formed by pressing the sheet with an upper mold and applying a vacuum to bring the sheet into close contact with the inner surface of the recess.
しかしながら、上記従来の真空成形方法は、金型の凹部
周縁内側のシートが真空によって凹部内に引込まれて容
器が形成されるので、シートが大きく引延ばされ、肉厚
を均一に成形することは困難で、偏肉の容器となる欠点
がある。However, in the conventional vacuum forming method described above, the sheet inside the periphery of the concave part of the mold is drawn into the concave part by vacuum to form a container, so the sheet is greatly stretched and it is difficult to form the sheet with a uniform wall thickness. It is difficult to do so, and has the disadvantage of producing a container with uneven thickness.
本発明者らは、同時に多数の容器を成形する真空成形方
法により、偏肉の殆んどない容器を成形すべく鋭意検討
した結果、個々の凹部に吸引されるシートの面積を大き
くすることが出来れば、成形された容器の偏肉が解消さ
れると考えた。The inventors of the present invention have conducted intensive studies to mold containers with almost no uneven thickness by using a vacuum forming method that molds a large number of containers at the same time. We thought that if possible, the uneven thickness of the molded container would be eliminated.
本発明は、上記の考えに基づいてなされたちので、偏肉
の少ない多数の容器を成形する真空成形方法を提供する
ことを目的とする。The present invention has been made based on the above idea, and an object of the present invention is to provide a vacuum forming method for forming a large number of containers with less uneven thickness.
（課題を解決するための手段〕
上記の目的を達成するため、本発明の方法は、熱可塑性
樹脂シートを加熱軟化して段数の四部か形成されている
金型上に載置し、凹部内を真空に引いて、上記シートを
凹部内面に密着させて容等の成形品を形成する真空成形
方法において、各凹部の周縁より、所定の間隔をおいて
周縁より大きい力、夕をシートに押付けた後、四部上の
シート中央を、プラグによって押圧し、周縁に対して／
−トを滑られて、凹部内に突出せしめるとともに、凹部
内を真空にする。(Means for Solving the Problems) In order to achieve the above object, the method of the present invention heats and softens a thermoplastic resin sheet and places it on a mold in which four stages are formed. In the vacuum forming method, in which the sheet is brought into close contact with the inner surface of the recess to form a molded product, a force greater than the periphery is applied to the sheet at a predetermined interval from the periphery of each recess. After that, press the center of the sheet on the four parts with the plug and press it against the periphery/
- The tip is slid and protrudes into the recess, and the inside of the recess is evacuated.
本発明の真空成形法は上記の構成となっているので、個
々の四部のシートがプラグによって、押される際、凹部
内に滑り込んで、真空成形される／−トの面積が増大す
る。Since the vacuum forming method of the present invention has the above-described structure, when the individual four sheets are pressed by the plugs, they slide into the recesses, increasing the area of the sheet to be vacuum formed.
〔実施例〕
第１図（ａ ）（ｂ ）は、本発明の方法に使用する装
置の一例を示すもので、図中符号１．２は、−１−下に
移動して、当接、離間する上下の金型である。[Example] FIGS. 1(a) and 1(b) show an example of an apparatus used in the method of the present invention, in which reference numeral 1.2 indicates -1- downward movement, contact, The upper and lower molds are spaced apart.
下金型２には、縦横等間隔に容器を真空成形する、水手
断面が円形の多数の四部３が設けられている。The lower mold 2 is provided with a large number of four parts 3 having circular cross-sections, which are used to vacuum form containers at equal intervals vertically and horizontally.
各凹部３はそれぞれ成形用ｔｉｌｌ管４を介して集合管
５に接続されている。また、上記凹部３の周縁３ａの外
側近傍には細管６が開口しており、これら細管６は、別
の集合管７に接続されている。上記集合管５，７は、そ
れぞれ別の配管によって、真空に保持されている真空容
器８および加圧に（７持されている加圧容器９に接続さ
れている。上記配管には集合管５．７を、真空容器８或
いは加圧容器９に自在に接続出来るバルブが設けられて
いる。Each recess 3 is connected to a collecting pipe 5 via a molding till pipe 4, respectively. Furthermore, thin tubes 6 are opened near the outer side of the peripheral edge 3a of the recess 3, and these thin tubes 6 are connected to another collecting tube 7. The collecting pipes 5 and 7 are connected to a vacuum container 8 held in vacuum and a pressurized container 9 held under pressure by separate piping. 7 is provided with a valve that can freely connect it to a vacuum vessel 8 or a pressurized vessel 9.
また、上金型１には、上記下金型２の四部周縁３ａと所
定の間隔をおいて、先端が金型２の」二面に当接する、
円筒状のカッターＩＯが設けられている。Further, the upper mold 1 has a tip which is in contact with two surfaces of the mold 2 at a predetermined distance from the four peripheral edges 3a of the lower mold 2.
A cylindrical cutter IO is provided.
このカッターｌＯは、スプリング等によって下方に賦勢
されており、先端の刃１０ａが下金型−１−面に当接し
、さらに上金型１が下金型２近接すると、−１−金型内
に引込むように構成されている。また上記上金型ｌの」
―記カッター１０の中心位置には、下金型２の凹部３内
に入る、所定の高さのプラグ１１が設けられている。This cutter IO is biased downward by a spring or the like, and when the blade 10a at the tip comes into contact with the -1- surface of the lower mold, and when the upper mold 1 approaches the lower mold 2, the -1- mold It is configured to be retracted inward. Also, the above upper mold l'
- A plug 11 of a predetermined height is provided at the center of the cutter 10 to fit into the recess 3 of the lower mold 2.
上記構成の装置を用いて容器を成形するには、第２図（
ａ）〜（ｇ）に、下金型２の−・つの凹部３およびこれ
に対向する」１金型１の拡大断面図を示すように、先ず
、熱可塑性樹脂／−ト１２をヒーター１３によって加熱
軟化せしめ、この軟化したシートを、第１図（ａ）或い
は第２図（ｂ）に示すように上下の金型１，２の間に位
置させ、第２図（ｃ）に示すように下金型２を上昇させ
シート１２を下金型＋２の上面に載置した状態とする。In order to mold a container using the apparatus with the above configuration, the procedure shown in Fig. 2 (
As shown in a) to (g), which are enlarged sectional views of the two recesses 3 of the lower mold 2 and the opposing mold 1, the thermoplastic resin/metal 12 is first heated by the heater 13. The softened sheet is heated and then placed between the upper and lower molds 1 and 2 as shown in FIG. 1(a) or FIG. 2(b), and as shown in FIG. 2(c). The lower mold 2 is raised to place the sheet 12 on the upper surface of the lower mold +2.
次いで上金型ｌを降下させ、カッター１０の先端の刃１
０ａを７−ｈ１２に当接し、さらに降下させるとシート
１２は切断されるが、軟化した／−トは、切断されに＜
＜、薄膜で接続された状態となり、カッター１０は上金
型１の降下に伴って」−金型１内に収納される。さらに
上金型ｌが降下してプラグ１１が、凹部３上の円形シー
ト１２に当ると、円形シートｌ ２’ の中心部は四部
３内に押込まれ、凹部周縁３ａ外側の円形シート１２は
、周縁３ａを滑って凹部３の内部に引込まれる。Next, lower the upper mold l, and cut the blade 1 at the tip of the cutter 10.
When 0a contacts 7-h12 and is further lowered, the sheet 12 is cut, but the softened /-t is not cut.
The cutter 10 is connected with the thin film, and the cutter 10 is housed in the mold 1 as the upper mold 1 is lowered. When the upper mold l further descends and the plug 11 hits the circular sheet 12 on the recess 3, the center of the circular sheet l 2' is pushed into the four parts 3, and the circular sheet 12 outside the recess periphery 3a is It slides on the peripheral edge 3a and is drawn into the recess 3.
その際集合管７は、加圧容ｉ！（９に接続され、１′１
１１管６より空気が噴出しているので、周縁に対する円
形／−ト１２’ の滑りはよく、また、その周囲は薄膜
１２゛ａ によって接続しているので容易に弓延ばされ
、円形シート１２′ は殆んど延伸されることなく四部
３内に押込まれる。プラグ１１か完全に押込まれ第２図
（Ｑ）の状態となると同時に集合管７，９は共に真空容
器８に接続され、円形シート１２°の外周近傍は、四部
周縁外近傍に密行されるとともに、凹部３内のシート１
２°は凹部３の内面に密着し容器１４が形成される。こ
れを冷却して、上記集合間５．７を上記加圧容器に接続
すれば、細管４，６より空気が噴出し、各凹部３によっ
て成形された多数の容器１４は、薄膜１２°ａ によっ
て接続しているノートと共に離形される。At this time, the collecting pipe 7 has a pressurized volume i! (connected to 9, 1'1
11 Since air is blown out from the tube 6, the circular sheet 12' easily slides against the periphery, and since its periphery is connected by the thin film 12'a, it is easily stretched, and the circular sheet 12'' is pushed into the fourth part 3 with almost no stretching. At the same time that the plug 11 is completely pushed in and the state shown in Fig. 2 (Q) is reached, the collecting pipes 7 and 9 are both connected to the vacuum vessel 8, and the vicinity of the outer periphery of the circular sheet 12° is closed to the vicinity of the outer periphery of the four parts. At the same time, the sheet 1 in the recess 3
2° is in close contact with the inner surface of the recess 3 to form a container 14. When this is cooled and the gathering space 5.7 is connected to the pressurized container, air is blown out from the thin tubes 4 and 6, and the numerous containers 14 formed by each recess 3 are formed by the thin film 12°a. It will be released along with the connected notes.
本発明の方法は、厚さが５０μｍ〜５ｍｍのシ−トに幅
広く対応可能で、絞り比（深さ／開［−］径）２以」−
の深絞りの容器ら造ることが出来る。The method of the present invention can be applied to a wide range of sheets with a thickness of 50 μm to 5 mm, and the drawing ratio (depth/open [-] diameter) is 2 or more.
Can be made from deep-drawn containers.
なお、上記説明は横断面が円形の場合について説明した
が、楕円形、角形なとのものについても適用可能である
。In addition, although the above description has been made for the case where the cross section is circular, it is also applicable to cases where the cross section is oval or square.
また、上記細管６を設けることにより円形シートの滑り
、および離型は容易となるが、切換えノ＼ルブ、集合管
の増加、或いは下金型か曳離になる等の不利な条件を避
けるため、これを設けなくとも、比較的偏肉の少ない容
器をつくることか出来る。In addition, although the provision of the thin tube 6 makes it easier to slide the circular sheet and release the mold, it is necessary to avoid disadvantageous conditions such as an increase in the number of switching knobs and collecting tubes, or the lower mold being pulled apart. Even without this, it is possible to create a container with relatively little uneven thickness.
以上述べたように本発明の方法は、カッターを押付ける
ことによって、四部上部の／−１−は、完全に切断され
ることはないが、薄膜によって接続した状ｊｆｇとなっ
ているので、プラグによって、押圧すると、凹部周縁外
のシートが周縁を滑って凹部内に入り、この状態で真空
引きするので、凹部内面に密行される／−トの面積は大
きく、／−トの延伸される割合は少ないので偏肉の少な
い容器が得られる。As described above, in the method of the present invention, by pressing the cutter, the /-1- at the top of the four parts is not completely cut off, but it is connected by a thin film to form a jfg. When pressed, the sheet outside the periphery of the recess slides along the periphery and enters the recess, and is vacuumed in this state, so the area of the /-t that is closely packed on the inner surface of the recess is large, and the sheet is stretched. Since the ratio is small, a container with less uneven thickness can be obtained.
また、成形された容器は、シートと完全に切断されてい
ないので、シートを金型から剥離する際シートと共に回
収される。Further, since the molded container is not completely cut from the sheet, it is collected together with the sheet when the sheet is peeled from the mold.
さらに、−回の操作によって、多数の偏肉の殆んどない
容器が、効率よく成形され、深絞りら可能であり、また
シートの厚さにも幅広（対応出家るなど、多くの長所を
有する。Furthermore, through several operations, a large number of containers with almost no uneven thickness can be efficiently formed, deep drawing is possible, and the sheet can be made into a wide range of thicknesses. have
第１図（ａ ）（ｂ ）は、本発明の方法を実施例する
装置の一例を示すもので、第１図（ａ）は、側面概略図
、第１図（ｂ）は、第１図＜ａ＞のｌ−１腺失視図に、
カッター、プラグの位置を示した図、第２図（ａ）〜（
ｇ）は工程の説明図で、第２図（ａ）は、／−トを加軟
化する方法を示す図、第２図（ｂ）〜（ｇ）は第１図（
ａ）のｎ−Ｉ線矢視した拡大断面図で、第２図（ｂ）は
、上下金型の間にシートを配置した図、第２図（Ｃ）は
、下金型上面に７−１・を載置した図、第２図（ｄ）は
、−」１金型を降下させノ１ツタ−でシートを切断する
図、第２図（ｅ）は、円形シー１へをプラグによって凹
部内に押込んだ図、第２図（ｆ）は、真空引きして容器
を形成した図、第２図（ｇ）は、真空成形した容器を離
型した図であ第１図
１・・・上金型、２・・・・下金型、３・・・・・・凹
部、３ａ・周縁、４・・・・・成形用細管、５・・・・
・集合管、６・・・ｌ１ｌｌ管、７ ・・・集合管、８
・・・・真空容器、９・・加圧容器、ｉｏ ・・・カ
ッター １０ａ・・・・・先端の刃、１１・・・・・・
プラグ、１２・・・・・・熱可塑性樹脂シー ト
（／−）） 、 １２ ° ・・ ・・
・ 円 形 ノ − ト 、 ＋２’ａ・・・・・
薄膜、１３・・ ・・ヒータ、１４・・・・・・容器。1(a) and 1(b) show an example of an apparatus for carrying out the method of the present invention, FIG. 1(a) is a schematic side view, and FIG. 1(b) is a In the l-1 gland agnosia map of <a>,
Diagram showing the positions of the cutter and plug, Figures 2(a) to (
g) is an explanatory diagram of the process, FIG. 2(a) is a diagram showing the method of softening /-t, and FIG.
This is an enlarged sectional view taken along line n-I in a), FIG. 2(b) is a diagram showing the sheet placed between the upper and lower molds, and FIG. Fig. 2 (d) is a drawing in which the mold 1 is lowered and the sheet is cut with a cutter, and Fig. 2 (e) is a drawing in which the mold 1 is lowered and the sheet is cut with a cutter. Figure 2(f) is a diagram of the container being pushed into the recess, and Figure 2(g) is a diagram of the vacuum-formed container being released from the mold.・・Upper mold, 2・・Lower mold, 3・・Recess, 3a/periphery, 4・・Thin tube for molding, 5・・・・
・Collecting pipe, 6...l1ll pipe, 7...Collecting pipe, 8
...Vacuum container, 9...Pressure container, io...Cutter 10a...Tip blade, 11...
Plug, 12...Thermoplastic resin sheet
(/-)), 12°...
・Circular note, +2'a...
Thin film, 13... Heater, 14... Container.
Claims (1)
れている金型上に載置し、凹部内を真空に引いて上記シ
ートを凹部内面に密着させて容器等の成形品を形成する
真空成形方法において、各凹部の周縁より、所定の間隔
をおいて周縁より大きいカッタをシートに押付けた後、
凹部上の中央を、プラグによって押圧し、周縁に対して
シートを滑られて、凹部内に突出せしめるとともに、凹
部内を真空にすることを特徴とする真空成形方法。A thermoplastic resin sheet is heated and softened, placed on a mold with multiple recesses, and the inside of the recesses is evacuated to bring the sheet into close contact with the inner surface of the recesses to form a molded product such as a container. In the forming method, after pressing a cutter larger than the periphery onto the sheet at a predetermined interval from the periphery of each recess,
A vacuum forming method characterized in that the center of the recess is pressed by a plug, the sheet is slid against the periphery to protrude into the recess, and the inside of the recess is evacuated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13666889A JPH031927A (en) | 1989-05-30 | 1989-05-30 | Vacuum molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13666889A JPH031927A (en) | 1989-05-30 | 1989-05-30 | Vacuum molding method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH031927A true JPH031927A (en) | 1991-01-08 |
Family
ID=15180697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13666889A Pending JPH031927A (en) | 1989-05-30 | 1989-05-30 | Vacuum molding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH031927A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012102316A1 (en) * | 2011-01-28 | 2012-08-02 | カルソニックカンセイ株式会社 | Vacuum molding method |
| KR101185834B1 (en) * | 2010-07-19 | 2012-10-02 | 주식회사 홍진에이치제이씨 | Helmet shield including ventilation structure |
-
1989
- 1989-05-30 JP JP13666889A patent/JPH031927A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101185834B1 (en) * | 2010-07-19 | 2012-10-02 | 주식회사 홍진에이치제이씨 | Helmet shield including ventilation structure |
| WO2012102316A1 (en) * | 2011-01-28 | 2012-08-02 | カルソニックカンセイ株式会社 | Vacuum molding method |
| JP2012153115A (en) * | 2011-01-28 | 2012-08-16 | Calsonic Kansei Corp | Vacuum molding method |
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