JP3430182B2 - Thermoforming method and thermoforming equipment for crystalline resin sheet - Google Patents
Thermoforming method and thermoforming equipment for crystalline resin sheetInfo
- Publication number
- JP3430182B2 JP3430182B2 JP14508494A JP14508494A JP3430182B2 JP 3430182 B2 JP3430182 B2 JP 3430182B2 JP 14508494 A JP14508494 A JP 14508494A JP 14508494 A JP14508494 A JP 14508494A JP 3430182 B2 JP3430182 B2 JP 3430182B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- thermoforming
- sheet
- female
- crystalline resin
- 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 - Fee Related
Links
Landscapes
- Containers Having Bodies Formed In One Piece (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ポリエチレンテレフタ
レート等の結晶性樹脂シートを熱成形する方法と、この
成形法に最適な熱成形装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for thermoforming a crystalline resin sheet such as polyethylene terephthalate, and a thermoforming apparatus most suitable for this forming method.
【０００２】[0002]
【従来の技術】周知の通り、熱成形法は、シート状の樹
脂素材からカップ状の肉薄製品を成形するのに最適な成
形方法である。2. Description of the Related Art As is well known, the thermoforming method is the most suitable forming method for forming a cup-shaped thin product from a sheet-shaped resin material.
【０００３】図１２は従来の熱成形装置の型閉じ状態を
示すものである。熱成形装置は雌型５０を支持する下型
５５と、プラグ６２を昇降可能に支持する上型と、樹脂
シート９０を支持するクランプ装置６５を備えており、
型閉じ状態においては、クランプ装置６５により平面的
に支持された樹脂シート９０を挟んでその上下両側に、
下型５５の押え部５６と、雌型５０の上端部５３と、上
型６０の押え部６１が同一レベルに位置するようになっ
ていて、この型閉じの時点では樹脂シート９０は延伸さ
れない。FIG. 12 shows a mold closed state of a conventional thermoforming apparatus. The thermoforming device includes a lower mold 55 that supports the female mold 50, an upper mold that supports the plug 62 so that the plug 62 can move up and down, and a clamp device 65 that supports the resin sheet 90.
In the mold closed state, the resin sheet 90 planarly supported by the clamp device 65 is sandwiched between the upper and lower sides thereof,
The holding portion 56 of the lower die 55, the upper end portion 53 of the female die 50, and the holding portion 61 of the upper die 60 are located at the same level, and the resin sheet 90 is not stretched at the time of closing the die.
【０００４】この後、プラグ６２が下降して樹脂シート
９０を雌型５０内に押し込み、更に、上型６０の給気孔
６３から加圧空気を供給するとともに、雌型５０及び下
型５５の各排気孔５２，５７から雌型５０内の空気を吸
引することによって、樹脂シート９０を雌型５０の成形
面５１に密接させて延伸し、成形面５１と同形状同寸法
の製品を成形している。After that, the plug 62 descends to push the resin sheet 90 into the female mold 50, and further, pressurized air is supplied from the air supply hole 63 of the upper mold 60, and each of the female mold 50 and the lower mold 55. By sucking the air in the female die 50 through the exhaust holes 52 and 57, the resin sheet 90 is drawn in close contact with the molding surface 51 of the female die 50 to form a product having the same shape and size as the molding surface 51. There is.
【０００５】[0005]
【発明が解決しようとする課題】従来の熱成形法及び熱
成形装置は、ポリ塩化ビニルやポリスチレン等の非結晶
性樹脂を成形する場合、あるいは、結晶性樹脂をメルト
成形する場合には何等問題を生じなかった。The conventional thermoforming method and thermoforming apparatus have no problems when molding an amorphous resin such as polyvinyl chloride or polystyrene or when melt-molding a crystalline resin. Did not occur.
【０００６】しかしながら、ポリエチレンテレフタレー
ト（以下、ＰＥＴと略称する）やポリプロピレン（以
下、ＰＰと略称する）等の結晶性樹脂シートを素材とし
て、背の低い（深さの浅い）製品を成形する場合には、
問題となることがあった。However, when a short product (shallow depth) is formed using a crystalline resin sheet such as polyethylene terephthalate (hereinafter abbreviated as PET) or polypropylene (hereinafter abbreviated as PP) as a raw material. Is
There was a problem.
【０００７】詳述すると、これら結晶性樹脂は、所定条
件下で所定の倍率に延伸することによって、分子が配向
し、密度の上昇が生じて、強度が向上するという性質を
有している。ところが、延伸倍率が所定の倍率に達しな
いと、密度上昇が起こらず、強度の向上が見られず、
又、透明性が損なわれたり、成形後の後処理でヒートセ
ットを行った場合に白化する等の問題が生じるからであ
る。More specifically, these crystalline resins have the property that when they are stretched to a predetermined ratio under predetermined conditions, the molecules are oriented, the density is increased, and the strength is improved. However, if the draw ratio does not reach the predetermined ratio, the density does not increase and the strength is not improved.
Further, there is a problem that transparency is impaired, and whitening occurs when heat setting is performed in a post-treatment after molding.
【０００８】本発明はこのような従来の技術の問題点に
鑑みてなされたものであり、結晶性樹脂シートを熱成形
するにあたって高い延伸倍率を得ることができ、結晶性
樹脂の物性を向上することができる結晶性樹脂シートの
熱成形法と熱成形装置を提供することを目的とする。The present invention has been made in view of the above-mentioned problems of the prior art. A high draw ratio can be obtained in thermoforming a crystalline resin sheet, and the physical properties of the crystalline resin are improved. An object of the present invention is to provide a thermoforming method and a thermoforming device for a crystalline resin sheet that can be used.
【０００９】本発明は、前記課題を解決するために、以
下の手段を採用した。
（本発明の要旨）本方法発明は、加熱軟化した結晶性樹
脂シートを、上型に設置されたプラグで下型内に収納し
た雌型内に押入れした後、加熱軟化した結晶性樹脂シー
トを雌型の成形面に密接させて、雌型の成形面と同形状
同寸法の有底筒状の製品を成形する結晶性樹脂シートの
熱成形法において、上型の押え部と下型の押え部を相互
に接触させる型閉じ時に、前記シートを雌型の上端部に
接触させるとともに上型の押え部の内面と雌型の外面と
の間で隙間を形成して前記シートを延伸ならしめて該シ
ートを雌型の成形面に密接させる熱成形に際して所定の
延伸倍率を得ることを特徴とする結晶性樹脂シートの熱
成形法である（請求項１に対応）。The present invention adopts the following means in order to solve the above problems. (Summary of the Invention) The method of the present invention is to press a heat-softened crystalline resin sheet into a female mold housed in a lower mold with a plug installed in an upper mold, and then heat-soften the crystalline resin sheet. In the thermoforming method of the crystalline resin sheet, which is in close contact with the molding surface of the female mold and molds a cylindrical product with the same shape and dimensions as the female molding surface, the pressing part of the upper mold and the pressing part of the lower mold. When the mold is closed, the sheet is brought into contact with the upper end of the female mold, and a gap is formed between the inner surface of the pressing portion of the upper mold and the outer surface of the female mold to stretch the sheet. A thermoforming method for a crystalline resin sheet, characterized in that a predetermined stretch ratio is obtained during thermoforming in which the sheet is brought into close contact with the molding surface of the female mold (corresponding to claim 1).
【００１０】ここで、シートを雌型によってプラグに接
近する方向に突き出すとは、あくまでシートと雌型との
相対的な動きによるものであり、実際に雌型をプラグに
接近移動させる場合のみならず、雌型を固定したままシ
ートをプラグと同期して雌型に接近移動させる場合も含
むものである。Here, the protrusion of the seat in the direction of approaching the plug by the female die is due to the relative movement of the seat and the female die only, and only when the female die is actually moved closer to the plug. Instead, it includes the case where the sheet is moved closer to the female mold in synchronization with the plug while the female mold is fixed.
【００１１】シートを雌型によってプラグに接近する方
向に突き出すタイミングは、プラグによりシートを延伸
する前であっても後であっても、あるいは同時であって
も構わない。The timing of projecting the sheet in the direction approaching the plug by the female mold may be before or after stretching the sheet by the plug, or at the same time.
【００１２】又、本発明は上記熱成形法に好適な熱成形
装置を提供する。即ち、本装置発明は、加熱軟化した結
晶性樹脂シートを、上型に配置されたプラグで下型内に
収納した雌型内に押入れした後、前記シートを雌型の成
形面に密接させて、雌型の成形面と同形状同寸法の有底
筒状の製品を成形する結晶性樹脂シートの熱成形装置に
おいて、前記雌型を支持する下型と、前記プラグが昇降
可能に設置された上型とを備え、上型の押え部と協働し
て結晶性樹脂シートを挟持する下型の押え部が、型閉じ
時に前記シートを延伸させて該シートを雌型の成形面に
密着させる熱成形に際して所定の延伸倍率が得られるよ
うに雌型の上端部よりも下方に位置していることを特徴
とする結晶性樹脂シートの熱成形装置である（請求項２
に対応）。The present invention also provides a thermoforming apparatus suitable for the above thermoforming method. That is, the present invention is that the heat-softened crystalline resin sheet is pushed into the female mold housed in the lower mold by the plug arranged in the upper mold, and then the sheet is brought into close contact with the molding surface of the female mold. In a thermoforming device for a crystalline resin sheet that molds a bottomed cylindrical product having the same shape and size as the molding surface of the female mold, the lower mold that supports the female mold and the plug are installed so that they can move up and down. A lower die holding part, which includes an upper die and holds the crystalline resin sheet in cooperation with the upper die holding portion, stretches the sheet when the die is closed to bring the sheet into close contact with the molding surface of the female die. A thermoforming device for a crystalline resin sheet, characterized in that it is positioned below the upper end of the female mold so as to obtain a predetermined draw ratio during thermoforming (claim 2).
Corresponding to).
【００１３】さらに、本装置は、加熱軟化した結晶性樹
脂シートを、上型に配置されたプラグで下型内に収納し
た雌型内に押入れした後、前記シートを雌型の成形面に
密接させて、雌型の成形面と同形状同寸法の有底筒状の
製品を成形する結晶性樹脂シートの熱成形装置におい
て、前記雌型が昇降可能に設置された下型と、前記プラ
グが昇降可能に設置された上型とを備え、前記雌型は、
下型の押え部より突き出て上型の内面との間で隙間を形
成して前記シートを延伸させる外径を有することを特徴
とする結晶性樹脂シートの熱成形装置である（請求項３
に対応）。Further, in this apparatus, the heat-softened crystalline resin sheet is pushed into the female mold housed in the lower mold by the plug arranged in the upper mold, and then the sheet is brought into close contact with the molding surface of the female mold. Then, in a thermoforming device for a crystalline resin sheet for molding a bottomed tubular product having the same shape and size as the molding surface of the female mold, the lower mold in which the female mold is vertically movable and the plug are An upper mold installed so as to be able to move up and down, the female mold,
A thermoforming device for a crystalline resin sheet, characterized in that it has an outer diameter that protrudes from the holding portion of the lower mold and forms a gap between it and the inner surface of the upper mold to stretch the sheet (claim 3).
Corresponding to).
【００１４】雌型及びプラグを昇降せしめる機構には、
空気式や油圧式や電動式等のアクチュエータを採用する
ことができる。The mechanism for raising and lowering the female mold and the plug includes
Pneumatic, hydraulic or electric actuators can be used.
【００１５】上記二つの熱成形装置において、プラグの
外形形状を雌型の成形面と相似形にすることも可能であ
る。In the above two thermoforming devices, it is possible to make the outer shape of the plug similar to the female molding surface.
【００１６】〈本発明の原材料〉本発明のシートの素材
である結晶性樹脂としては、ＰＥＴやＰＰ等の飽和ポリ
エステルを例示することができる。<Raw material of the present invention> As the crystalline resin which is the material of the sheet of the present invention, saturated polyester such as PET or PP can be exemplified.
【００１７】〈本発明の利用可能性〉本発明は、樹脂製
容器等を製造する分野に利用可能である。<Applicability of the Present Invention> The present invention can be used in the field of producing resin containers and the like.
【００１８】[0018]
〈本発明の作用〉本方法発明によれば、結晶性樹脂シー
トに対する延伸倍率が増大し、適正な密度上昇を得るこ
とができ、製品の強度を上げることができるとともに、
耐熱性及び透明性を上げることができる。<Operation of the Present Invention> According to the present invention, the draw ratio for the crystalline resin sheet is increased, an appropriate density increase can be obtained, and the strength of the product can be increased,
Heat resistance and transparency can be improved.
【００１９】本発明の第１の熱成形装置（請求項２に対
応）の場合には、上型と共に結晶性樹脂シートを下降し
て下型に接近していくと、結晶性シートが雌型の上端部
に当接した後、結晶性樹脂シートを延伸させながら上型
と下型の型閉じが進行する。更にこの後、プラグを突き
出し、シートを成形面に密接させることによりシートの
延伸を行う。In the case of the first thermoforming apparatus of the present invention (corresponding to claim 2), when the crystalline resin sheet is lowered together with the upper mold and is approached to the lower mold, the crystalline sheet becomes a female mold. After abutting on the upper end of the mold, the mold closing of the upper mold and the lower mold progresses while stretching the crystalline resin sheet. Further, after this, the sheet is stretched by ejecting the plug and bringing the sheet into close contact with the molding surface.
【００２０】本発明の第２の熱成形装置（請求項３に対
応）の場合には、雌型を下型内に収納した状態で型閉じ
する。型閉じ後に、プラグの突き出しと、雌型の突き出
しによりシートの延伸工程を行う。プラグ突き出しのタ
イミングと雌型突き出しのタイミングはいずれを先に行
ってもよいし、あるいは両方同時に行ってもよい。この
後に、シートを成形面に密接させることにより更にシー
トの延伸を行う。In the case of the second thermoforming device of the present invention (corresponding to claim 3), the mold is closed while the female mold is housed in the lower mold. After the mold is closed, the process of stretching the sheet is performed by the protrusion of the plug and the protrusion of the female mold. Either the plug ejection timing or the female die ejection timing may be performed first, or both may be performed simultaneously. After that, the sheet is further stretched by bringing the sheet into close contact with the molding surface.
【００２１】[0021]
【実施例】以下、本発明の実施例を図１から図１１の図
面を参照して説明する。
〔第一実施例〕初めに、第１実施例の熱成形装置につい
て図１から図６の図面を参照して説明する。熱成形装置
は、雌型５０と下型５５と上型６０とプラグ６２とクラ
ンプ装置６５とヒータ７０とを備えている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the drawings of FIGS. First Embodiment First, the thermoforming apparatus of the first embodiment will be described with reference to the drawings of FIGS. 1 to 6. The thermoforming apparatus includes a female die 50, a lower die 55, an upper die 60, a plug 62, a clamp device 65, and a heater 70.
【００２２】雌型５０の内面は成形すべき製品の外形と
同形状及び同寸法の成形面５１になっている。雌型５０
は多数の排気孔５２を有している。尚、図では図示の都
合上、排気孔５２を１つだけ描いている。The inner surface of the female die 50 is a molding surface 51 having the same shape and size as the outer shape of the product to be molded. Female 50
Has a large number of exhaust holes 52. For convenience of illustration, only one exhaust hole 52 is drawn in the figure.
【００２３】雌型５０は下型５５に固定されており、雌
型５０の上端部５３は下型５５の押え部５６から所定寸
法だけ突き出ている。下型５５には雌型５０の排気孔５
２に連通する排気孔５７が設けられており、排気孔５７
は図示しない吸引装置に接続されていて、雌型５０内の
空気を吸引することができるようになっている。The female die 50 is fixed to the lower die 55, and the upper end portion 53 of the female die 50 projects from the holding portion 56 of the lower die 55 by a predetermined dimension. The lower die 55 has an exhaust hole 5 of the female die 50.
2 has an exhaust hole 57 communicating with the exhaust hole 57.
Is connected to a suction device (not shown) so that the air in the female mold 50 can be sucked.
【００２４】上型６０は昇降可能に設置されており、下
型５５と協働して型閉じ及び型開き可能になっている。
上型６０の押え部６１の内径は雌型５０の上端部５３の
外径よりも大径で、型閉じした時に上型６０の内面と雌
型５０の外面との間に所定寸法の隙間が形成されるよう
になっている。この隙間は型閉じ時にＰＥＴシート９０
の延伸を可能ならしめるものである。The upper mold 60 is installed so as to be able to move up and down, and can cooperate with the lower mold 55 to close and open the mold.
The inner diameter of the pressing portion 61 of the upper die 60 is larger than the outer diameter of the upper end portion 53 of the female die 50, and when the die is closed, a gap of a predetermined size is formed between the inner surface of the upper die 60 and the outer surface of the female die 50. To be formed. This gap is the PET sheet 90 when the mold is closed.
This makes it possible to stretch.
【００２５】上型６０にはプラグ６２が昇降可能に設置
されているとともに、給気孔６３が設けられている。給
気孔６３は図示しない給気装置に接続されていて、上型
６０内に加圧空気を供給できるようになっている。The upper mold 60 is provided with a plug 62 which can be moved up and down, and an air supply hole 63. The air supply hole 63 is connected to an air supply device (not shown) so that pressurized air can be supplied into the upper mold 60.
【００２６】下型５５と上型６０との間には、ＰＥＴシ
ート９０を緊張状態に挟持するクランプ装置６５が昇降
可能に設置されるとともに、ＰＥＴシート９０を加熱軟
化するためのヒータ７０が退避可能に設置されている。A clamp device 65 for sandwiching the PET sheet 90 in a tensioned state is installed between the lower mold 55 and the upper mold 60 so as to be movable up and down, and a heater 70 for heating and softening the PET sheet 90 is retracted. It is installed as possible.
【００２７】次に、この第１実施例の熱成形装置を用い
た熱成形法を工程順に説明する。尚、この実施例は、厚
さ１．０ｍｍのＰＥＴ製のシートから図１１に示す形状
及び寸法の製品３０を成形する態様である。Next, a thermoforming method using the thermoforming apparatus of the first embodiment will be described in the order of steps. In this embodiment, the product 30 having the shape and size shown in FIG. 11 is molded from a PET sheet having a thickness of 1.0 mm.
【００２８】〈１．軟化工程〉図１に示すように、型開
き状態の下型５５と上型６０の間に、クランプ装置６５
で緊張状態に挟持したＰＥＴシート９０をセットし、ヒ
ータ７０でＰＥＴシート９０を所定温度（例えば、７０
〜９０゜Ｃ）に加熱して軟化する。軟化完了後、ヒータ
７０を下型５５と上型６０の間から退避させる。<1. Softening Step> As shown in FIG. 1, a clamp device 65 is provided between the lower mold 55 and the upper mold 60 in the mold open state.
Set the PET sheet 90 sandwiched in a tense state with the heater 70, and heat the PET sheet 90 with the heater 70 at a predetermined temperature (for example, 70
Heat to ~ 90 ° C) to soften. After the softening is completed, the heater 70 is retracted from between the lower die 55 and the upper die 60.
【００２９】〈２．第一延伸工程〉上型６０を下降さ
せ、図２に示すように押え部６１がＰＥＴシート９０に
ほぼ当接する状態になったならば、クランプ装置６５を
上型６０と同期して下降する。<2. First Stretching Step> When the upper die 60 is lowered to bring the pressing portion 61 into almost contact with the PET sheet 90 as shown in FIG. 2, the clamp device 65 is lowered in synchronization with the upper die 60.
【００３０】ＰＥＴシート９０が雌型５０の上端部５３
に当接した後も、図３のように上型６０の押え部６１が
最終的に下型５５の押え部５６の上に突き当たり型閉じ
するまで、上型６０及びクランプ装置６５を下降させ
る。The PET sheet 90 is the upper end portion 53 of the female die 50.
3, the upper die 60 and the clamp device 65 are lowered until the holding portion 61 of the upper die 60 finally abuts on the holding portion 56 of the lower die 55 and closes the die as shown in FIG.
【００３１】ＰＥＴシート９０が雌型５０の上端部５３
に当接した後、押え部６１と押え部５６が当接するまで
の間に、ＰＥＴシート９０は雌型５０によって突き出さ
れて延伸する。その結果、ＰＥＴシート９０は配向さ
れ、密度の上昇が生じる。これが第一延伸工程であり、
従来の熱成形法にはない本発明に特有の工程である。The PET sheet 90 is the upper end portion 53 of the female die 50.
The PET sheet 90 is extruded and stretched by the female mold 50 until the pressing portion 61 and the pressing portion 56 come into contact with each other after the contact with the. As a result, the PET sheet 90 is oriented and an increase in density occurs. This is the first stretching step,
This is a process unique to the present invention, which is not found in the conventional thermoforming method.
【００３２】尚、雌型５０の上端部５３の角部を円弧状
に面取りするのが好ましい。そのようにすると、上端部
５３においてＰＥＴシート９０の滑りが良くなり、延伸
効果を上げることができる。It is preferable to chamfer the corners of the upper end portion 53 of the female die 50 in an arc shape. By doing so, the PET sheet 90 slips well on the upper end portion 53, and the stretching effect can be improved.
【００３３】〈３．第二延伸工程〉次に、図４に示すよ
うに、型閉じ状態でプラグ６２を下降し、ＰＥＴシート
９０を延伸させながら雌型５０内に押入する。これが第
二延伸工程であり、第二延伸工程においてもＰＥＴシー
ト９０は配向され、密度の上昇が生じる。<3. Second Stretching Step> Next, as shown in FIG. 4, the plug 62 is lowered in the mold closed state, and the PET sheet 90 is stretched and pushed into the female mold 50. This is the second stretching step, and the PET sheet 90 is oriented in the second stretching step as well, and the density is increased.
【００３４】〈４．最終延伸工程〉この後、上型６０の
給気孔６３から加圧空気を供給するとともに、雌型５０
の排気孔５２及び下型５５の排気孔５７から雌型５０内
の空気を排気することにより、図５に示すように、ＰＥ
Ｔシート９０を延伸しながら雌型５０の成形面５１に密
接させる。これが最終延伸工程であり、最終延伸工程に
おいてもＰＥＴシート９０は配向され、密度の上昇が生
じる。<4. Final Stretching Step> Thereafter, while supplying pressurized air from the air supply hole 63 of the upper mold 60, the female mold 50
As shown in FIG. 5, PE is exhausted by exhausting the air in the female mold 50 from the exhaust hole 52 of the lower mold 55 and the exhaust hole 57 of the lower mold 55.
The T sheet 90 is drawn and brought into close contact with the molding surface 51 of the female mold 50. This is the final stretching step, and the PET sheet 90 is oriented in the final stretching step as well, causing an increase in density.
【００３５】この最終延伸工程の遂行により、ＰＥＴシ
ート９０が製品３０に成形されることとなる。By performing this final stretching step, the PET sheet 90 is molded into the product 30.
【００３６】〈５．ヒートセット工程〉最終延伸工程終
了後、加圧空気の供給と雌型５０内の排気を続行しなが
ら、若しくは、加圧空気の供給と雌型５０内の排気を停
止して、雌型５０を図示しないバンドヒータ等で加熱し
てヒートセットを行う。ヒートセットは、例えば、１１
０〜１３５゜Ｃ程度の温度で約５秒間固定することによ
り達成される。<5. Heat setting step> After the final stretching step is completed, the female die 50 is set while continuing the supply of the pressurized air and the exhaust of the female die 50, or by stopping the supply of the pressurized air and the exhaust of the female die 50. Heat is set by heating with a band heater (not shown) or the like. Heat set is, for example, 11
It is achieved by fixing at a temperature of 0 to 135 ° C for about 5 seconds.
【００３７】〈６．型開き工程〉加圧空気の供給、及
び、雌型５０内の排気を停止し、図６に示すように上型
６０及びクランプ装置６５を上昇させることにより、雌
型５０からＰＥＴシート９０を取り出す。<6. Mold Opening Step> The supply of the pressurized air and the exhaust of the inside of the female die 50 are stopped, and the upper die 60 and the clamp device 65 are raised as shown in FIG. 6 to take out the PET sheet 90 from the female die 50. .
【００３８】〈７．仕上げ工程〉クランプ装置６５から
ＰＥＴシート９０を取り外し、ＰＥＴシート９０から製
品３０の部分を切断する。<7. Finishing Step> The PET sheet 90 is removed from the clamp device 65, and the portion of the product 30 is cut from the PET sheet 90.
【００３９】〈本実施例と従来法との比較〉表１は、本
実施例の熱成形法で成形した製品３０と、従来の熱成形
法（即ち、第一延伸工程を具備しない熱成形法）で成形
した製品３０とを、肉厚、密度、白化現象の有無につい
て比較したデータである。尚、どちらの場合も、厚さ
１．０ｍｍ、密度１．３３ｇ／ｃｍ3のＰＥＴシートを
素材とし、成形すべき製品３０の形状、寸法は図１１に
示すものと同一にした。肉厚、密度、及び白化現象の有
無の測定位置は図１１のＡからＩとした。<Comparison between the present embodiment and the conventional method> Table 1 shows the product 30 formed by the thermoforming method of the present embodiment and the conventional thermoforming method (that is, the thermoforming method not including the first drawing step). The data obtained by comparing the product 30 molded in () with respect to the wall thickness, the density, and the presence or absence of the whitening phenomenon. In both cases, a PET sheet having a thickness of 1.0 mm and a density of 1.33 g / cm 3 was used as a raw material, and the shape and dimensions of the product 30 to be molded were the same as those shown in FIG. The measurement positions for the wall thickness, the density, and the presence or absence of the whitening phenomenon were set from A to I in FIG.
【００４０】又、本実施例の熱成形法を実施するにあっ
ては、雌型５０の上端部５３を下型５５の押え部５６よ
りも１５ｍｍ突出させることにより面倍率を約３倍とし
た。これに対して従来の熱成形法の場合には面倍率は約
２．６６倍である。Further, in carrying out the thermoforming method of the present embodiment, the surface magnification is made about 3 times by projecting the upper end portion 53 of the female die 50 by 15 mm from the holding portion 56 of the lower die 55. . On the other hand, in the case of the conventional thermoforming method, the surface magnification is about 2.66 times.
【００４１】ここで、面倍率とは、ＰＥＴシート９０の
うち型閉じ時に下型５５及び上型６０の内部に収容され
た部分の、延伸成形前の該部分の（一方の面の）表面積
に対する延伸成形後の該部分の（同じ一方の面の）表面
積の比率をいう。即ち、延伸前後における成形部分の面
積増加率である。Here, the surface magnification refers to the surface area (on one surface) of the portion of the PET sheet 90, which is accommodated inside the lower die 55 and the upper die 60 when the die is closed, before the stretch forming. It refers to the ratio of the surface area (of the same one surface) of the portion after stretch molding. That is, it is the area increase rate of the molded portion before and after stretching.
【００４２】[0042]
【表１】 [Table 1]
【００４３】尚、「白化現象の有無」の欄の記号の意味
は次のとおりである。
○ 明らかに白化現象を生じた。
△ 準白化現象（完全な白化ではなく、青白い程度）
を生じた。
× 白化現象が生じなかった。The symbols in the "presence or absence of whitening phenomenon" column have the following meanings. ○ Clearly a whitening phenomenon occurred. △ Semi-whitening phenomenon (not completely whitening, but pale)
Occurred. × No whitening phenomenon occurred.
【００４４】表１から明らかなように、従来法で成形し
た製品３０よりも、本実施例の成形法で成形した製品３
０の方が、全体的に極めて延伸倍率が高く、薄肉にで
き、又、配向も十分に行われて密度の上昇も大きく剛性
等の強度が高まる。更に、本実施例の成形法で成形した
製品３０の方が、透明性もよく、白化現象も極めて起こ
りにくい。As is clear from Table 1, the product 3 molded by the molding method of this embodiment is more than the product 30 molded by the conventional method.
When 0 is set, the draw ratio is extremely high as a whole, the thickness can be reduced, the orientation is sufficiently performed, the density is largely increased, and the strength such as rigidity is increased. Further, the product 30 molded by the molding method of this embodiment has better transparency and the whitening phenomenon is extremely unlikely to occur.
【００４５】本実施例の場合においても測定位置Ｇ，Ｉ
については白化現象が見られるが、これら部分では白化
現象に伴い硬度が上昇する。Also in the case of the present embodiment, the measurement positions G and I
The whitening phenomenon is observed in the above, but the hardness of these parts increases with the whitening phenomenon.
【００４６】又、従来法のように延伸倍率が低く適正な
密度上昇が得られない状態でヒートセットを行うと、熱
による収縮が大きく形状の維持が難しく、透明性が損な
われたりした。しかしながら、本実施例のように延伸倍
率が大きく適正な密度上昇があると、ヒートセットを行
っても変形することがなく、透明性も損なわれにくく、
ヒートセットにより耐熱性を付与することができる。When heat setting is performed in a state where the stretching ratio is low and an appropriate increase in density cannot be obtained as in the conventional method, shrinkage due to heat is large and it is difficult to maintain the shape, and the transparency is impaired. However, when the stretching ratio is large and the density is appropriately increased as in the present example, it does not deform even when heat setting is performed, and transparency is not easily impaired,
Heat resistance can be imparted by heat setting.
【００４７】尚、本実施例の成形法において、延伸時に
ＰＥＴシート９０を滑り易くして延伸効果を上げるため
に、雌型５０を加温したり、雌型５０の成形面５１に特
殊な表面処理を施して滑性を高めることも可能である。In the molding method of this embodiment, in order to make the PET sheet 90 slippery during stretching and to enhance the stretching effect, the female die 50 is heated or a special surface is formed on the molding surface 51 of the female die 50. It is also possible to apply a treatment to enhance lubricity.
【００４８】〔第２実施例〕次に、第２実施例の熱成形
装置について図７から図１０を参照して説明する。この
熱成形装置では、雌型５０がアクチュエータ（エアシリ
ンダや油圧シリンダ等）８０によって下型５５に対して
昇降可能にされていて、アクチュエータ８０が下動した
状態では、雌型５０の上端部５３と下型５５の押え面５
６とが面一になっている。この点が第１実施例のものと
相違している。[Second Embodiment] Next, a thermoforming apparatus of a second embodiment will be described with reference to FIGS. 7 to 10. In this thermoforming apparatus, the female die 50 can be moved up and down with respect to the lower die 55 by an actuator (air cylinder, hydraulic cylinder, etc.) 80, and when the actuator 80 moves downward, the upper end portion 53 of the female die 50 is moved. And pressing surface 5 of lower mold 55
6 is flush with. This point is different from that of the first embodiment.
【００４９】次に、この第２実施例の熱成形装置を用い
た熱成形法を工程順に説明する。軟化工程については第
１実施例の場合と同じであるので説明を省略する。軟化
工程の後、上型６０とクランプ装置６５を同期して下降
せさ、図７に示すように、上型６０の押え部６１を下型
５５の押え部５６に突き当てて型閉じする。Next, a thermoforming method using the thermoforming apparatus of the second embodiment will be described in the order of steps. The softening process is the same as in the case of the first embodiment, so its explanation is omitted. After the softening step, the upper die 60 and the clamp device 65 are synchronously lowered, and the holding portion 61 of the upper die 60 is brought into contact with the holding portion 56 of the lower die 55 to close the die as shown in FIG.
【００５０】第１実施例の熱成形装置を用いた場合に
は、型閉じの進行に伴い雌型によってＰＥＴシート９０
が突き上げられ延伸されるようになっているが、この第
２実施例の熱成形装置を用いた場合には、型閉じ時には
雌型５０が下型５５から突き出ていないので、ＰＥＴシ
ート９０は延伸されない。When the thermoforming apparatus of the first embodiment is used, the PET sheet 90 is made by the female mold as the mold closing progresses.
However, when the thermoforming apparatus of the second embodiment is used, the female die 50 does not project from the lower die 55 when the die is closed, so the PET sheet 90 is stretched. Not done.
【００５１】第２実施例の熱成形装置を用いた場合に
は、図８に示すように、前記型閉じの後にアクチュエー
タ８０による雌型５０の上昇によって、ＰＥＴシート９
０を突き上げるようにする。これが第２実施例の熱成形
装置を用いた場合の第一延伸工程であり、これによっ
て、ＰＥＴシート９０は延伸され、配向され、密度が上
昇する。When the thermoforming apparatus of the second embodiment is used, as shown in FIG. 8, the PET sheet 9 is lifted by raising the female mold 50 by the actuator 80 after the mold is closed.
Try to push 0 up. This is the first stretching step when the thermoforming apparatus of the second embodiment is used, whereby the PET sheet 90 is stretched, oriented and the density is increased.
【００５２】この後、図９に示すようにプラグ６２が下
降して第二延伸工程となる。この第二延伸工程以降の各
工程については、第１実施例の熱成形装置を用いた場合
となんら変わるところがないので、その説明を省略す
る。After this, as shown in FIG. 9, the plug 62 descends to start the second drawing step. The steps subsequent to the second stretching step are the same as in the case of using the thermoforming apparatus of the first embodiment, and the description thereof will be omitted.
【００５３】この第２実施例の熱成形装置を用いた場合
にも、延伸工程が３段階に行われるので延伸倍率が大き
くなり、第１実施例の熱成形装置を用いた場合と同様
に、従来法で成形するよりも優れた物性を備えた製品３
０を製造することができる。Even when the thermoforming apparatus of the second embodiment is used, the stretching step is performed in three stages, so that the draw ratio becomes large, and like the case of using the thermoforming apparatus of the first embodiment, Product 3 with superior physical properties compared to conventional molding
0 can be produced.
【００５４】〔第２実施例の変形例〕尚、この第２実施
例の熱成形装置を用いて、次のように熱成形することも
可能である。つまり、図７の型閉じの状態から、雌型５
０をアクチュエータ８０で突き上げるよりも前に、図１
０に示すようにプラグ６２でＰＥＴシート９０を雌型５
０内に押入する。そして、その後で雌型５０をアクチュ
エータ８０で上方に突き上げて図９の状態にする。[Modification of Second Embodiment] The thermoforming apparatus according to the second embodiment can be used for the following thermoforming. That is, from the mold closed state of FIG.
Before pushing 0 with the actuator 80,
The PET sheet 90 with the plug 62 as shown in FIG.
Push into 0. Then, after that, the female die 50 is pushed up by the actuator 80 to be in the state of FIG.
【００５５】このようにすると、第一延伸工程と第二延
伸工程の前後が逆になるが、従来法よりも延伸工程が１
つ増えることに変わりはなく、延伸倍率を上げるという
作用、効果を得ることができる。In this way, the front and rear of the first stretching step and the second stretching step are reversed, but the number of stretching steps is one compared with the conventional method.
There is no change in the increase, and the action and effect of increasing the draw ratio can be obtained.
【００５６】[0056]
【発明の効果】以上説明したように、本発明によれば、
結晶性樹脂シートを熱成形するにあたって、延伸倍率の
向上及び適正な密度上昇を得ることができ、製品の強度
を上げることができるとともに、耐熱性及び透明性を上
げることができるという効果がある。As described above, according to the present invention,
When the crystalline resin sheet is thermoformed, it is possible to improve the draw ratio and increase the density appropriately, and it is possible to increase the strength of the product and heat resistance and transparency.
【図１】本発明の第１実施例の熱成形装置を用いた熱成
形法の説明図であり、軟化工程を示す図である。FIG. 1 is an explanatory diagram of a thermoforming method using a thermoforming apparatus according to a first embodiment of the present invention, showing a softening step.
【図２】本発明の第１実施例の熱成形装置を用いた熱成
形法の説明図であり、型閉じ途中を示す図である。FIG. 2 is an explanatory diagram of a thermoforming method using the thermoforming apparatus according to the first embodiment of the present invention, and is a diagram showing a mold closing process.
【図３】本発明の第１実施例の熱成形装置を用いた熱成
形法の説明図であり、第一延伸工程を示す図である。FIG. 3 is an explanatory diagram of a thermoforming method using the thermoforming apparatus according to the first embodiment of the present invention, showing the first stretching step.
【図４】本発明の第１実施例の熱成形装置を用いた熱成
形法の説明図であり、第二延伸工程を示す図である。FIG. 4 is an explanatory diagram of a thermoforming method using the thermoforming apparatus according to the first embodiment of the present invention, showing the second stretching step.
【図５】本発明の第１実施例の熱成形装置を用いた熱成
形法の説明図であり、最終延伸工程を示す図である。FIG. 5 is an explanatory diagram of a thermoforming method using the thermoforming apparatus according to the first embodiment of the present invention, and is a diagram showing a final stretching step.
【図６】本発明の第１実施例の熱成形装置を用いた熱成
形法の説明図であり、型開き工程を示す図である。FIG. 6 is an explanatory diagram of a thermoforming method using the thermoforming apparatus according to the first embodiment of the present invention, and is a diagram showing a mold opening step.
【図７】本発明の第２実施例の熱成形装置を用いた熱成
形法の説明図であり、型閉じ状態を示す図である。FIG. 7 is an explanatory view of a thermoforming method using the thermoforming apparatus according to the second embodiment of the present invention, showing the mold closed state.
【図８】本発明の第２実施例の熱成形装置を用いた熱成
形法の説明図であり、第一延伸工程を示す図である。FIG. 8 is an explanatory diagram of a thermoforming method using the thermoforming apparatus according to the second embodiment of the present invention, showing the first stretching step.
【図９】本発明の第２実施例の熱成形装置を用いた熱成
形法の説明図であり、第二延伸工程を示す図である。FIG. 9 is an explanatory diagram of a thermoforming method using the thermoforming apparatus according to the second embodiment of the present invention, showing the second stretching step.
【図１０】本発明の第２実施例の熱成形装置を用いた熱
成形法の変形例を説明する図であり、第一延伸工程を示
す図である。FIG. 10 is a diagram illustrating a modified example of the thermoforming method using the thermoforming apparatus according to the second embodiment of the present invention, showing the first stretching step.
【図１１】熱成形法で成形した製品の一例を示す図であ
る。FIG. 11 is a diagram showing an example of a product molded by a thermoforming method.
【図１２】従来の熱成形装置を用いたシートの熱成形法
を示す図である。FIG. 12 is a diagram showing a thermoforming method for a sheet using a conventional thermoforming device.
３０ 製品 ５０ 雌型 ５１ 成形面 ５３ 上端部 ５５ 下型 ５６ 押え部 ６０ 上型 ６１ 押え部 ６２ プラグ ９０ ＰＥＴシート（結晶性樹脂シート） 30 products 50 female 51 Molding surface 53 Upper end 55 Lower mold 56 Presser part 60 Upper mold 61 Presser foot 62 plug 90 PET sheet (Crystalline resin sheet)
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭49−17846（ＪＰ，Ａ) 特開 昭61−3726（ＪＰ，Ａ) 特開 平５−177698（ＪＰ，Ａ) 特開 昭54−33567（ＪＰ，Ａ) 特表 昭58−501711（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B29C 51/06 B29C 51/04 B29C 51/30 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-49-17846 (JP, A) JP-A-61-3726 (JP, A) JP-A-5-177698 (JP, A) JP-A-54- 33567 (JP, A) Special table Sho 58-501711 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB name) B29C 51/06 B29C 51/04 B29C 51/30
Claims (3)
に設置されたプラグで下型内に収納した雌型内に押入れ
した後、加熱軟化した結晶性樹脂シートを雌型の成形面
に密接させて、雌型の成形面と同形状同寸法の有底筒状
の製品を成形する結晶性樹脂シートの熱成形法におい
て、 上型の押え部と下型の押え部を相互に突き合わせる型閉
じ時に、前記シートを雌型の上端部に接触させるととも
に上型の押え部の内面と雌型の外面との間で隙間を形成
して前記シートを延伸ならしめて該シートを雌型の成形
面に密接させる熱成形に際して所定の延伸倍率を得るこ
とを特徴とする結晶性樹脂シートの熱成形法。1. A heat-softened crystalline resin sheet is pushed into a female mold housed in a lower mold by a plug installed in an upper mold, and then the heat-softened crystalline resin sheet is applied to a molding surface of the female mold. In the thermoforming method of the crystalline resin sheet, which is made by closely contacting and molding a cylindrical product with a bottom having the same shape and size as the molding surface of the female mold, the pressing part of the upper mold and the pressing part of the lower mold are butted against each other. When the mold is closed, the sheet is brought into contact with the upper end of the female mold, and a gap is formed between the inner surface of the pressing portion of the upper mold and the outer surface of the female mold so that the sheet is stretched to form the female mold. A thermoforming method for a crystalline resin sheet, which is characterized in that a predetermined draw ratio is obtained during thermoforming in which the surface is closely contacted.
に配置されたプラグで下型内に収納した雌型内に押入れ
した後、前記シートを雌型の成形面に密接させて、雌型
の成形面と同形状同寸法の有底筒状の製品を成形する結
晶性樹脂シートの熱成形装置において、 前記雌型を支持する下型と、前記プラグが昇降可能に設
置された上型とを備え、上型はその押え部の内径が雌型
の外径よりも大径であり、上型の押え部と協働して結晶
性樹脂シートを挟持する下型の押え部が、型閉じ時に前
記シートを延伸させて該シートを雌型の成形面に密接さ
せる熱成形に際して所定の延伸倍率が得られるように雌
型の上端部よりも下方に位置していることを特徴とする
結晶性樹脂シートの熱成形装置。2. The heat-softened crystalline resin sheet is pushed into a female mold housed in a lower mold by a plug arranged in an upper mold, and then the sheet is brought into close contact with a molding surface of the female mold to form a female mold. In a thermoforming device for a crystalline resin sheet for molding a bottomed tubular product having the same shape and size as the molding surface of the mold, a lower mold for supporting the female mold, and an upper mold in which the plug is vertically movable. And the upper die has an inner diameter of the holding portion that is larger than the outer diameter of the female die, and the lower die holding portion that clamps the crystalline resin sheet in cooperation with the upper die holding portion is A crystal characterized by being positioned below the upper end of the female mold so that a predetermined stretching ratio can be obtained during thermoforming in which the sheet is stretched when closed and the sheet is brought into close contact with the molding surface of the female mold. Thermoforming machine for flexible resin sheets.
に配置されたプラグで下型内に収納した雌型内に押入れ
した後、前記シートを雌型の成形面に密接させて、雌型
の成形面と同形状同寸法の有底筒状の製品を成形する結
晶性樹脂シートの熱成形装置において、 前記雌型が昇降可能に設置された下型と、前記プラグが
昇降可能に設置された上型とを備え、 前記雌型は、型締めに際して下型の押え部より突き出て
上型の内面との間で隙間を形成して前記シートを延伸さ
せる外径を有することを特徴とする結晶性樹脂シートの
熱成形装置。3. The heat-softened crystalline resin sheet is pushed into a female mold housed in a lower mold by a plug arranged in an upper mold, and then the sheet is brought into close contact with a molding surface of the female mold to form a female mold. In a thermoforming device for a crystalline resin sheet that molds a bottomed tubular product having the same shape and size as the molding surface of the mold, a lower mold in which the female mold is vertically movable and a plug in which the plug is vertically movable Wherein the female die has an outer diameter that protrudes from the holding portion of the lower die and forms a gap between the inner surface of the upper die to stretch the sheet when the die is clamped. Thermoforming device for crystalline resin sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14508494A JP3430182B2 (en) | 1994-06-27 | 1994-06-27 | Thermoforming method and thermoforming equipment for crystalline resin sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14508494A JP3430182B2 (en) | 1994-06-27 | 1994-06-27 | Thermoforming method and thermoforming equipment for crystalline resin sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH081765A JPH081765A (en) | 1996-01-09 |
| JP3430182B2 true JP3430182B2 (en) | 2003-07-28 |
Family
ID=15377018
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14508494A Expired - Fee Related JP3430182B2 (en) | 1994-06-27 | 1994-06-27 | Thermoforming method and thermoforming equipment for crystalline resin sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3430182B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3678112B2 (en) * | 2000-05-12 | 2005-08-03 | 東洋製罐株式会社 | Heat resistant container |
| JP2009196222A (en) * | 2008-02-21 | 2009-09-03 | Sintokogio Ltd | Molding equipment of thermoplastic resin sheet |
| CN108698308B (en) * | 2016-02-24 | 2021-10-26 | 三井化学株式会社 | Method for producing shaped film |
| CN107053639A (en) * | 2017-03-22 | 2017-08-18 | 江苏汤臣新材料科技有限公司 | A kind of lucite blows drawing thermal forming device |
-
1994
- 1994-06-27 JP JP14508494A patent/JP3430182B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH081765A (en) | 1996-01-09 |
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