JP3560645B2 - Plastic sheet molding method - Google Patents

Plastic sheet molding method Download PDF

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Publication number
JP3560645B2
JP3560645B2 JP13644694A JP13644694A JP3560645B2 JP 3560645 B2 JP3560645 B2 JP 3560645B2 JP 13644694 A JP13644694 A JP 13644694A JP 13644694 A JP13644694 A JP 13644694A JP 3560645 B2 JP3560645 B2 JP 3560645B2
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Japan
Prior art keywords
plastic sheet
edge
product
frame
vacuum
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JP13644694A
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Japanese (ja)
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JPH07314549A (en
Inventor
浩治 松岡
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Inoac Corp
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Inoac Corp
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【０００１】
【産業上の利用分野】
この発明はプラスチックシートの成形方法に関する。
【０００２】
【従来の技術】
一般的な真空成形方法を図５ないし図７に示す。まず図５に示されるように、凹形状の型面５１を有する真空成形型５０に、プラスチックシート５２が近接して配される。このプラスチックシート５２は製品成形部５４とその外周の縁部５５とよりなり、あらかじめ所定の温度に加熱され軟化状態で保持される。前記プラスチックシート５２は、軟質樹脂シート単体の他、ウレタンフォームなどからなるクッション層に塩化ビニールやファブリック材などの柔軟性を有するシートが積層あるいはラミネートされたものが用いられる。符号５６は前記プラスチックシート５２を保持するクランプ、５７は真空吸引孔で、図示しない真空吸引装置に接続されている。
前記真空成形型５０の反対側にはシール枠５３が配置されている。図６は、そのシール枠５３の斜視図である。このシール枠５３は、前記型面５１外周に沿った形状に形成されており、成形の際、前記真空成形型５０を下降またはシール枠５３を上昇させることによって、当該シール枠５３と型面５１外周との間にプラスチックシート５２の縁部５５を挟んで押圧し、型面周囲をシールするようになっている。
【０００３】
しかる後、前記プラスチックシート５２の製品成形部５４を真空成形型５０の型面５１に真空吸引し、所定の製品形状に賦形する。符号５８は前記シール枠５３の内側に設けられたプラグ型で、真空成形の際、型面５１方向に上昇して前記製品成形部５４を押し上げ、それにより前記製品成形部５４を型面５１に更に近接させて型面５１への真空吸引を容易かつ確実にする。
賦形された前記プラスチックシート５２は、真空成形型５０から脱型した後、図８に示されるように、トリム刃５９などによって製品部５４ａの基部から縁部５５を切除して製品とされる。
【０００４】
この真空成形方法では、プラスチックシート５２の縁部５５が型面外周で略水平に保持されて成形されるため、成形後の縁部５５は略水平方向に位置する。また、真空成形に用いられるプラスチックシート５２は剛性が低いため、前記縁部５５の切除時にその縁部５５が波打ち等の変形を生じ易い。さらに、シール枠５３の外周部分に位置するプラスチックシートの縁部５５は真空成形されないため、真空成形された製品部５４ａとの収縮量が大きく相違し、それによって縁部５５が波打ち変形し易い。
その結果、前記賦形後のプラスチックシート５２は、その縁部５５が略水平位置にあってしかも波打ち変形により上下していることが多いため、その波打ちに邪魔されて前記トリム刃５９を製品部５４ａの基部に精度よく挿入することが困難となり、かかる作業が効率的に行なえないという問題があった。
【０００５】
【発明が解決しようとする課題】
この発明は、このような問題点を解決するために提案されたものであって、プラスチックシート縁部の変形および波打ちを抑えて、製品部外周の切断を効率よく行なうことのできるプラスチックシートの成形方法を提供しようとするものである。
【０００６】
【課題を解決するための手段】
すなわち、この発明は、製品成形部とその外周の縁部とよりなるプラスチックシートを加熱軟化させて、凹形状の型面を有する真空成形型に近接配置し、前記プラスチックシートに対し真空成形型とは反対側に配置したシール枠によって前記プラスチックシートの縁部を型面の外周部に押圧して型面周囲をシールし、その状態で前記プラスチックシートの製品成形部を型面に真空吸引して製品形状に賦形するプラスチックシートの成形方法において、前記型面の外周部には前記シール枠の側面外周に嵌る枠部を、前記シール枠との間の隙間が前記プラスチックシートの厚みよりやや小さくなるように設け、前記プラスチックシートの縁部を、前記枠部とシール枠の側面間で挟んで前記型面から離れる方向へ保持しながら真空吸引を行ない、前記方向にプラスチックシートの縁部を賦形することにより、前記製品成形部が真空成形された製品部と前記縁部間の切除線よりも前記縁部を下げた形状にし、その後、前記製品部の基部に前記切除線に沿ってトリム刃を挿入して前記切除線の位置で前記縁部の切除作業を行うことを特徴とするプラスチックシートの成形方法に係る。
【０００７】
【実施例】
以下添付の図面に従ってこの発明を詳細に説明する。
図１はこの発明の真空成形型を用いた真空成形の一実施例を示す断面図、図２はその要部を示す断面図、図３はこの発明の方法によって成形されたプラスチックシートの斜視図、図４はその断面図である。
【０００８】
図１に示されるように、この発明で用いられる真空成形型１０は、図５および図６において示し説明した真空成形型と同様、凹形状の型面１１を有する雌型からなり、プラスチックシート２０の縁部２２を押圧保持するシール枠１５の一側に配置されるものである。符号１６はプラグ型、１７は真空吸引孔である。
【０００９】
前記真空成形型１０とシール枠１５との間には、略中央部分の製品成形部２１と外周の縁部２２とからなるプラスチックシート２０が近接配置される。このプラスチックシート２０はあらかじめ所定の温度に加熱されて適宜に軟化した状態に保たれている。
【００１０】
一方、型面１１の外周部１２には、前記シール枠１５の外周よりやや大きく形成された枠部１３が突出して設けられている。この枠部１３は、図２から理解されるように、プラスチックシートの縁部２２をシール枠１５と型面外周部１２とで押圧するに際し、当該シール枠１５の外周側面にプラスチックシートの縁部２２を介して嵌まるように構成されており、次の作用がある。その作用の一つは、前記プラスチックシートの縁部２２を型面１１から離れる方向、この実施例では下方へ屈曲せしめるためのものである。それによって、製品部（製品成形部２１が真空成形された部分）と縁部２２間の切除線Ｃよりも縁部２２を下げて、後にトリム刃を製品部の基部に挿入し易くすることである。また、他の作用は、前記シール枠１５とこの枠部１３間でプラスチックシートの縁部２２を挟んで真空成形するため、その際に、前記挟んだ部分で縁部２２が収縮変形して波打つのを防止できることである。さらに、他の作用は、プラスチックシートの縁部２２を、型面外周部１２とシール枠１５上面間、および枠部１３内面とシール枠１５外側面間の広い面積で確実に挟持するため、真空成形型１０のシール性を向上できることである。
【００１１】
この枠部１３の高さは、プラスチックシート２０の材質や厚みあるいは物性などによって適宜に設定されるが、真空成形時に枠部１３の外側で少なからず発生する縁部２２の波打ちが、前記切除線Ｃを越えて製品部側まで達しないように、縁部２２を充分に折り曲げることのできる高さにする必要がある。本実施例では約８ｍｍである。さらに、前記プラスチックシート２０の縁部２２を介してシール枠１５に容易かつ確実に枠部１３が嵌まるように、前記枠部１３の内側面は、型面１１方向に向かうテーパ状に形成することが望ましい。また、プラスチックシートの縁部２２を確実に折り曲げ賦形するとともに、シール性を高めるために、前記枠部１３とシール枠１５とのクリアランス（隙間）は、プラスチックシート２０の厚みよりやや小さく設定されることが好ましい。
【００１２】
次いで、前記シール枠１５と真空成形型１０の型面外周１２とで、プラスチックシート２０の縁部２２を押圧してシールする。その際に、前記枠部１３がプラスチックシート２０の縁部２２を介してシール枠１５の側部外周に嵌まり、図のようにプラスチックシートの縁部２２が前記型面１１に対して離れる方向に折り曲げられる。
【００１３】
この状態で、前記真空吸引孔１７と接続された真空吸引装置（図示せず）を作動させ、前記プラスチックシート２０の製品成形部２１を型面１１に吸着し所定形状に賦形し、常法に従う冷却により形状固定して製品部を形成する。
得られた成形品を図３および図４に示す。図から理解されるように、前記枠部１３によって、プラスチックシートの縁部２２が、製品部２１ａとは反対方向に略直角に屈曲して賦形されているので、その屈曲賦形部分（前記シール枠１５と枠部１３で挟まれた部分）より先端の縁部で波打ち変形があっても、その変形部が製品部２１ａ基部の切除線Ｃを越えて製品部２１ａ側まで達することがない。しかも、前記プラスチックシートの縁部２２の屈曲により、前記切除線Ｃを挟んで製品部２１ａと縁部２２が大きく口を開いた状態となる。そのため、後で行なわれる縁部２２の切除作業時に、前記縁部２２の波打ち変形に邪魔されることなくトリム刃を切除線Ｃに沿って挿入することができ、その切除作業が極めて効率的かつ精度良好に行なうことができるようになる。
【００１４】
なお、本実施例では、シール枠の上方に真空成形型を配置したが、製品形状などによっては、シール枠の下方に型面を上向きにして真空成形型を配してもよい。
【００１５】
【発明の効果】
以上図示し説明したように、この発明のプラスチックシートの成形方法によれば、プラスチックシートの縁部が製品部と離れる方向に屈曲して賦形されるので、切除線を挟んで製品部と縁部が開いた状態にプラスチックシートを真空成形でき、かつ切除線付近での波打ち変形を防止できる。そのため、トリム刃などの位置決めおよび挿入が簡単かつ確実で、かかる切除作業を極めて効率よく正確に行なうことができる。
また、前記プラスチックシートの縁部が、真空成形時に枠部およびシール枠による凹凸を含む広い面積で押圧されるので、真空成形型のシール性も良好になり、効率良く真空成形することができる。
【図面の簡単な説明】
【図１】この発明の真空成形型を用いた真空成形の一実施例を示す断面図である。
【図２】その要部を示す断面図である。
【図３】この発明の方法によって成形されたプラスチックシートの斜視図である。
【図４】その断面図である。
【図５】一般的な真空成形型の一例を示す断面図である。
【図６】そのシール枠を示す斜視図である。
【図７】その真空成形型を用いる真空成形時を示す断面図である。
【図８】図５に示された真空成形型によって成形されたプラスチックシートの断面図である。
【符号の説明】
１０ 真空成形型
１１ 型面
１２ 型面外周部
１３ 枠部
１５ シール枠
２０ プラスチックシート
２１ 製品成形部
２２ 縁部[0001]
[Industrial applications]
The present invention relates to a method for forming a plastic sheet .
[0002]
[Prior art]
A general vacuum forming method is shown in FIGS. First, as shown in FIG. 5, a plastic sheet 52 is placed close to a vacuum forming die 50 having a concave mold surface 51. The plastic sheet 52 includes a product forming portion 54 and an outer peripheral edge 55, and is heated to a predetermined temperature in advance and held in a softened state. As the plastic sheet 52, in addition to a single soft resin sheet, a sheet obtained by laminating or laminating a flexible sheet such as vinyl chloride or a fabric material on a cushion layer made of urethane foam or the like is used. Reference numeral 56 denotes a clamp for holding the plastic sheet 52, and reference numeral 57 denotes a vacuum suction hole, which is connected to a vacuum suction device (not shown).
A seal frame 53 is arranged on the opposite side of the vacuum forming die 50. FIG. 6 is a perspective view of the seal frame 53. The seal frame 53 is formed in a shape along the outer periphery of the mold surface 51. During molding, the seal frame 53 and the mold surface 51 are formed by lowering the vacuum forming mold 50 or raising the seal frame 53. The edge 55 of the plastic sheet 52 is sandwiched between the outer periphery and the outer periphery and pressed to seal around the mold surface.
[0003]
Thereafter, the product forming portion 54 of the plastic sheet 52 is vacuum-sucked on the mold surface 51 of the vacuum forming die 50, and shaped into a predetermined product shape. Reference numeral 58 denotes a plug type provided inside the seal frame 53, which rises in the direction of the mold surface 51 and pushes up the product molding portion 54 during vacuum molding, whereby the product molding portion 54 is brought into contact with the mold surface 51. Further, the vacuum suction to the mold surface 51 is made easier and more reliable by bringing them closer to each other.
After the shaped plastic sheet 52 is released from the vacuum forming mold 50, as shown in FIG. 8, an edge 55 is cut off from the base of the product portion 54a by a trim blade 59 or the like to form a product. .
[0004]
In this vacuum molding method, the edge 55 of the plastic sheet 52 is molded while being held substantially horizontally on the outer periphery of the mold surface, so that the edge 55 after molding is located in a substantially horizontal direction. Further, since the plastic sheet 52 used for vacuum forming has low rigidity, the edge 55 is likely to be deformed such as wavy when the edge 55 is cut off. Furthermore, since the edge 55 of the plastic sheet located on the outer peripheral portion of the seal frame 53 is not vacuum-formed, the contraction amount with the vacuum-formed product portion 54a is largely different, and the edge 55 is easily deformed by waving.
As a result, the plastic sheet 52 after the shaping often has its edge 55 located in a substantially horizontal position and moves up and down due to wavy deformation. There is a problem that it becomes difficult to insert the work into the base of the 54a with high accuracy, and that such work cannot be performed efficiently.
[0005]
[Problems to be solved by the invention]
The present invention has been proposed in order to solve such a problem, and it is possible to suppress deformation and waving of a plastic sheet edge and form a plastic sheet capable of efficiently cutting the outer periphery of a product portion. It seeks to provide a way .
[0006]
[Means for Solving the Problems]
That is, the present invention heats and softens a plastic sheet formed of a product forming portion and an outer peripheral edge thereof, and arranges the plastic sheet close to a vacuum forming die having a concave mold surface. By pressing the edge of the plastic sheet against the outer periphery of the mold surface by a seal frame arranged on the opposite side to seal the periphery of the mold surface, in this state, vacuum-suction the product molding portion of the plastic sheet to the mold surface. In the method of forming a plastic sheet to be shaped into a product shape, a frame portion fitted on the outer periphery of the side surface of the seal frame is formed on an outer peripheral portion of the mold surface, and a gap between the seal frame and the seal frame is slightly smaller than a thickness of the plastic sheet. made as provided, the edges of the plastic sheet, subjected to vacuum while maintaining the direction away from the mold surface by being sandwiched between the side surfaces of the frame portion and the sealing frame, before By shaping the edge of the plastic sheet in the direction, the product forming portion than ablation line between the edges and the product portion which is vacuum formed to the shape determination unit lowers the edge, then the product portion The present invention relates to a method for forming a plastic sheet , wherein a trim blade is inserted into a base along the cutting line, and the edge is cut at the position of the cutting line .
[0007]
【Example】
Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a cross-sectional view showing one embodiment of vacuum forming using a vacuum forming die of the present invention, FIG. 2 is a cross-sectional view showing a main part thereof, and FIG. 3 is a perspective view of a plastic sheet formed by the method of the present invention. FIG. 4 is a sectional view thereof.
[0008]
As shown in FIG. 1, the vacuum forming die 10 used in the present invention comprises a female die having a concave mold surface 11, like the vacuum forming die shown and described in FIGS. Is disposed on one side of the seal frame 15 for pressing and holding the edge 22 of the seal frame 15. Reference numeral 16 denotes a plug type, and 17 denotes a vacuum suction hole.
[0009]
Between the vacuum forming die 10 and the seal frame 15, a plastic sheet 20 composed of a product forming portion 21 at a substantially central portion and an outer peripheral edge portion 22 is disposed in close proximity. The plastic sheet 20 is heated to a predetermined temperature in advance and kept in an appropriately softened state.
[0010]
On the other hand, on the outer peripheral portion 12 of the mold surface 11, a frame portion 13 formed slightly larger than the outer periphery of the seal frame 15 is provided so as to protrude. As can be understood from FIG. 2, when the edge portion 22 of the plastic sheet is pressed by the seal frame 15 and the outer peripheral portion 12 of the mold surface, the frame portion 13 is formed on the outer peripheral side surface of the seal frame 15 by the edge portion of the plastic sheet. It is configured so as to fit through the connector 22 and has the following operation. One of its functions is to bend the edge 22 of the plastic sheet away from the mold surface 11, in this embodiment downward. Thereby, the edge 22 is lower than the cut line C between the product part (the part where the product molding part 21 is vacuum-formed) and the edge 22 to facilitate insertion of the trim blade into the base of the product part later. is there. Another effect is that since the plastic frame is vacuum-formed between the seal frame 15 and the frame portion 13 with the edge portion 22 interposed therebetween, the edge portion 22 contracts and deforms and undulates at the interposed portion. Can be prevented. Another effect is that the edge 22 of the plastic sheet is securely held in a wide area between the outer peripheral portion 12 of the mold surface and the upper surface of the seal frame 15 and between the inner surface of the frame portion 13 and the outer surface of the seal frame 15. That is, the sealing property of the mold 10 can be improved.
[0011]
The height of the frame portion 13 is appropriately set depending on the material, thickness, or physical properties of the plastic sheet 20, but the undulation of the edge portion 22 that occurs at the outside of the frame portion 13 during vacuum forming is caused by the cutting line. It is necessary to make the edge 22 sufficiently foldable so as not to reach the product portion side beyond C. In this embodiment, it is about 8 mm. Further, the inner surface of the frame portion 13 is formed in a tapered shape toward the mold surface 11 so that the frame portion 13 can be easily and securely fitted to the seal frame 15 via the edge portion 22 of the plastic sheet 20. It is desirable. In addition, in order to reliably bend and shape the edge 22 of the plastic sheet and to enhance the sealing property, the clearance (gap) between the frame 13 and the seal frame 15 is set to be slightly smaller than the thickness of the plastic sheet 20. Preferably.
[0012]
Next, the edge 22 of the plastic sheet 20 is pressed and sealed by the seal frame 15 and the outer periphery 12 of the mold surface of the vacuum forming die 10. At this time, the frame 13 is fitted on the outer periphery of the side of the seal frame 15 via the edge 22 of the plastic sheet 20, and the edge 22 of the plastic sheet separates from the mold surface 11 as shown in the figure. Folded.
[0013]
In this state, a vacuum suction device (not shown) connected to the vacuum suction hole 17 is operated to adsorb the product forming portion 21 of the plastic sheet 20 to the mold surface 11 and shape it into a predetermined shape. To form a product part by cooling according to the above.
The obtained molded product is shown in FIGS. As can be understood from the figure, the edge portion 22 of the plastic sheet is bent and formed at a substantially right angle in a direction opposite to the product portion 21a by the frame portion 13, so that the bent and formed portion (the Even if there is a wavy deformation at the edge at the tip end of the portion between the seal frame 15 and the frame portion 13), the deformed portion does not reach the product portion 21a side beyond the cutting line C at the base of the product portion 21a. . In addition, due to the bending of the edge 22 of the plastic sheet, the product portion 21a and the edge 22 are greatly opened with the cut line C interposed therebetween. Therefore, at the time of the cutting operation of the edge portion 22 performed later, the trim blade can be inserted along the cutting line C without being disturbed by the wavy deformation of the edge portion 22, and the cutting operation is extremely efficient and It can be performed with good accuracy.
[0014]
In this embodiment, the vacuum forming die is arranged above the seal frame. However, depending on the product shape, the vacuum forming die may be arranged below the seal frame with the mold surface facing upward.
[0015]
【The invention's effect】
As shown and described above, according to the plastic sheet molding method of the present invention , the edge of the plastic sheet is bent and shaped in a direction away from the product part, so that the edge of the plastic sheet and the product part are sandwiched by the cutting line. The plastic sheet can be vacuum formed with the part opened, and the wavy deformation near the cut line can be prevented. Therefore, the positioning and insertion of the trim blade and the like are simple and reliable, and such a cutting operation can be performed extremely efficiently and accurately.
Further, since the edge of the plastic sheet is pressed over a wide area including the irregularities due to the frame portion and the seal frame during vacuum forming, the sealing performance of the vacuum forming mold is improved, and the vacuum forming can be performed efficiently.
[Brief description of the drawings]
FIG. 1 is a sectional view showing one embodiment of vacuum forming using a vacuum forming die of the present invention.
FIG. 2 is a sectional view showing a main part thereof.
FIG. 3 is a perspective view of a plastic sheet formed by the method of the present invention.
FIG. 4 is a sectional view of the same.
FIG. 5 is a sectional view showing an example of a general vacuum forming die.
FIG. 6 is a perspective view showing the seal frame.
FIG. 7 is a cross-sectional view showing a state during vacuum forming using the vacuum forming die.
FIG. 8 is a sectional view of a plastic sheet formed by the vacuum forming die shown in FIG.
[Explanation of symbols]
REFERENCE SIGNS LIST 10 vacuum forming die 11 mold surface 12 mold surface outer peripheral portion 13 frame portion 15 seal frame 20 plastic sheet 21 product molding portion 22 edge

Claims (1)

製品成形部（２１）とその外周の縁部（２２）とよりなるプラスチックシート（２０）を加熱軟化させて、凹形状の型面（１１）を有する真空成形型（１０）に近接配置し、前記プラスチックシート（２０）に対し真空成形型（１０）とは反対側に配置したシール枠（１５）によって前記プラスチックシートの縁部（２２）を型面の外周部（１２）に押圧して型面周囲をシールし、その状態で前記プラスチックシートの製品成形部（２１）を型面（１１）に真空吸引して製品形状に賦形するプラスチックシートの成形方法において、
前記型面の外周部（１２）には前記シール枠（１５）の側面外周に嵌る枠部（１３）を、前記シール枠（１５）との間の隙間が前記プラスチックシート（２０）の厚みよりやや小さくなるように設け、
前記プラスチックシートの縁部（２２）を、前記枠部（１３）とシール枠（１５）の側面間で挟んで前記型面（１１）から離れる方向へ保持しながら真空吸引を行ない、前記方向にプラスチックシートの縁部（２２）を賦形することにより、前記製品成形部（２１）が真空成形された製品部（２１ａ）と前記縁部（２２）間の切除線（Ｃ）よりも前記縁部（２２）を下げた形状にし、
その後、前記製品部（２１ａ）の基部に前記切除線（Ｃ）に沿ってトリム刃を挿入して前記縁部（２２）の切除作業を行うことを特徴とするプラスチックシートの成形方法。 A plastic sheet (20) composed of a product forming part (21) and an outer peripheral edge (22) is softened by heating, and is placed close to a vacuum forming die (10) having a concave die surface (11); The edge (22) of the plastic sheet is pressed against the outer periphery (12) of the mold surface by a seal frame (15) disposed on the opposite side of the plastic sheet (20) from the vacuum forming mold (10). the surface surrounding seal, in the molding method for a plastic sheet shaped into the product shape by vacuum suction on the product forming portion of the plastic sheet (21) of the mold surface in that state (11),
The outer peripheral portion (12) of the mold surface has a frame portion (13) fitted on the outer periphery of the side surface of the seal frame (15), and the gap between the seal frame (15) is larger than the thickness of the plastic sheet (20). Provided to be slightly smaller,
Vacuum suction is performed while holding the edge (22) of the plastic sheet in a direction away from the mold surface (11) by sandwiching the edge (22) between the frame (13) and the side surface of the seal frame (15). By shaping the edge (22) of the plastic sheet, the product forming part (21) is more rim than the cut line (C) between the vacuum formed product part (21a) and the edge (22). The part (22) has a lowered shape,
Thereafter, a trim blade is inserted into the base of the product section (21a) along the cutting line (C) to cut off the edge (22) .
JP13644694A 1994-05-25 1994-05-25 Plastic sheet molding method Expired - Fee Related JP3560645B2 (en)

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JP13644694A JP3560645B2 (en) 1994-05-25 1994-05-25 Plastic sheet molding method

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JPH07314549A JPH07314549A (en) 1995-12-05
JP3560645B2 true JP3560645B2 (en) 2004-09-02

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CN112757615B (en) * 2020-12-18 2021-09-21 索菲亚家居股份有限公司 Plastic suction mold and manufacturing method of arc plastic suction products
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