JPS61225024A - Method for heating foamed sheet in molding of sheet - Google Patents

Method for heating foamed sheet in molding of sheet

Info

Publication number
JPS61225024A
JPS61225024A JP6834085A JP6834085A JPS61225024A JP S61225024 A JPS61225024 A JP S61225024A JP 6834085 A JP6834085 A JP 6834085A JP 6834085 A JP6834085 A JP 6834085A JP S61225024 A JPS61225024 A JP S61225024A
Authority
JP
Japan
Prior art keywords
heating
sheet
heating plate
parts
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.)
Granted
Application number
JP6834085A
Other languages
Japanese (ja)
Other versions
JPH0155984B2 (en
Inventor
Masato Yaita
八板 正人
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sekisui Kasei Co Ltd
Original Assignee
Sekisui Plastics Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sekisui Plastics Co Ltd filed Critical Sekisui Plastics Co Ltd
Priority to JP6834085A priority Critical patent/JPS61225024A/en
Publication of JPS61225024A publication Critical patent/JPS61225024A/en
Publication of JPH0155984B2 publication Critical patent/JPH0155984B2/ja
Granted legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/26Component parts, details or accessories; Auxiliary operations
    • B29C51/42Heating or cooling

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Abstract

PURPOSE:To eliminate the mutual drawing or interference of a foamed sheet and to prevent the shift of a printing position, by forming recessed parts, which demarcate a plurality of molding parts of the foamed sheet, to the contact surface of a heating plate and suppressing the transfer of heat to the foamed sheet at said recessed parts and forming a heating suppressing part to the position demarcating each molding part. CONSTITUTION:A heating plate 10 is perfectly contacted with a foamed sheet S at the parts (a) with which the leading end surface of the heating plate 10 is contacted and strongly pressed not only to soften the parts (a) but also to simultaneously compress the same largely in the thickness direction and a thickness T1 becomes thinner than the thickness T before heating. The parts (b), which are contacted with the shallow circular recessed parts 12 of the heating plate 10, of the foamed sheet S are relatively weakly compressed and the heat softening degree of said parts (b) becomes lower than that of the parts (a) but said parts (b) is softened under heating to a degree necessary for molding. Further, at the parts (c) contacted with the grid shaped recessed parts 13 of the heating plate 10, the foamed sheet S is not contacted with the heating plate 10 and heating is suppressed and, therefore, said parts (c) do not soften under heating or are compressed and the thickness of the foamed sheet S holds the original thickness T as it was.

Description

【発明の詳細な説明】 く技術分野〉 この発明は、シート成形における発泡シートの加熱方法
に関し、加熱軟化した熱可塑性樹脂の発泡シートを、成
形型に沿って膨出変形させて、所定の成形品形状に成形
する、いわゆるシート成形において、素材となる発泡シ
ートを加熱軟化させる為の加熱方法に関している。
[Detailed Description of the Invention] Technical Field> The present invention relates to a method of heating a foamed sheet in sheet molding, in which a foamed sheet of thermoplastic resin that has been softened by heating is bulged and deformed along a mold to form a predetermined shape. It relates to a heating method for heating and softening a foamed sheet as a raw material in so-called sheet molding, which is molded into a product shape.

〈従来技術〉 上記シート成形において、発泡シートを加熱する方法と
して、発泡シートの両面に加熱板を接触させ、この加熱
板からの直接の熱伝達によって、発泡シートを加熱する
方法があり、例えば、特開昭58−110224号公報
等に開示されている。
<Prior art> In the sheet forming process described above, there is a method of heating the foam sheet by bringing a heating plate into contact with both sides of the foam sheet and heating the foam sheet by direct heat transfer from the heating plate. It is disclosed in Japanese Patent Application Laid-Open No. 58-110224 and the like.

この加熱板による接触加熱方法は、発泡シートに対する
加熱の均一化、加熱時の発泡膨張による厚み増大の防止
等に有効なものである。
This contact heating method using a heating plate is effective in uniformly heating the foam sheet and preventing an increase in thickness due to foam expansion during heating.

そして、上記先行技術公報においては、加熱板に部分的
に加熱温度の異なる部分を形成して、加熱軟化する発泡
シートに、部分的に加熱軟化度の異なる高温部と低温部
とを形成することが開示されている。
In the above-mentioned prior art publication, a heating plate is formed with portions having different heating temperatures, and a foamed sheet that is heated and softened is formed with a high-temperature portion and a low-temperature portion having a partially different heating softening degree. is disclosed.

このうち、低温部としては、加熱板に円筒状の凹部を形
成しておくことによって、発泡シートのうちの成形品に
相当する位置に、円形状の低温部を形成し、高温部とし
ては、発泡シートのうち、成形品の周囲で最終的にトリ
ミングされて成形品を構成しない部分全体に形成しであ
る。そして、このような高温部を形成する効果として、
成形時に、流動性の大きな高温部から成形品の中央側に
樹脂が供給されて、成形品全体の肉厚を安定化したり、
スムーズな成形が行えるものであるとされている。この
成形品の外部から中央側への樹脂の供給は、通常、発泡
シートの引込みと称され、シート成形の品質向上にとっ
て、極めて重要なものである。
Among these, the low temperature part is formed by forming a cylindrical recess in the heating plate, and the circular low temperature part is formed at the position corresponding to the molded product in the foam sheet, and the high temperature part is: The foam sheet is formed over the entire portion of the foamed sheet that is ultimately trimmed around the molded product and does not constitute the molded product. And, as an effect of forming such a high temperature part,
During molding, resin is supplied from the high-temperature part with high fluidity to the center of the molded product, stabilizing the wall thickness of the entire molded product,
It is said that it can be molded smoothly. This supply of resin from the outside to the center of the molded product is usually referred to as pulling in the foam sheet, and is extremely important for improving the quality of sheet molding.

一方、シート成形において、複数の成形品を同時に成形
する場合には、発泡シートのうち、隣接する成形品部分
が、成形工程において、互いの境界を越えて、発泡シー
トが引込まれたり、干渉しないようにする必要がある。
On the other hand, when molding multiple molded products at the same time in sheet molding, the adjacent molded product parts of the foam sheets will not be drawn in or interfere with each other in the molding process by crossing their boundaries. It is necessary to do so.

さらに、発泡シート原反として、予め印刷が施されたも
のを使用する場合、成形品の定位置に印刷の模様や配色
が配置されるように、発泡シートがズしたり変形しない
ようにして、成形する必要がある。
Furthermore, when using a pre-printed foam sheet, the foam sheet must be made so that it does not shift or deform so that the printed pattern and color scheme are placed in the correct position on the molded product. Needs to be shaped.

ところが、上記先行技術のように、成形品の外周全体に
高温部を形成して、成形品中央への引込みを大きくする
と、隣接する成形品同士で、周辺部分の発泡シートの引
込み合いが強くなり、互いに干渉して成形不良を起した
り、肉厚が局部的に不均一になる問題が生じる。また、
成形品の周辺部分全体に形成した高温部は、非常に変形
したり移動し易いため、発泡シートに予め施された印刷
の位置が移動したりズレ易く、成形品の印刷ズレが多く
発生する欠点があった。さらに、上記高温部の形成によ
って、発泡シート全体の形状維持性が悪くなって、反っ
たり弛んだりし易くなり、加熱工程から成形工程への発
泡シートの移送が行い雌く、成形型における発泡シート
の保持も正確に行い難くなる問題も生じる。
However, as in the prior art described above, if a high-temperature area is formed around the entire outer periphery of a molded product to increase the retraction toward the center of the molded product, the foam sheets in the peripheral portions of adjacent molded products will be attracted to each other more strongly. , there are problems in that they interfere with each other and cause molding defects, or that the thickness becomes locally uneven. Also,
The high-temperature area formed around the entire periphery of the molded product is very easily deformed and moved, so the position of the printing applied in advance on the foam sheet is likely to shift or shift, resulting in a number of misaligned prints on the molded product. was there. Furthermore, due to the formation of the above-mentioned high-temperature areas, the shape retention of the entire foamed sheet deteriorates, making it easy to warp or loosen, causing the foamed sheet to be transferred from the heating process to the molding process. There also arises a problem that it becomes difficult to hold the image accurately.

〈目的〉 そこで、この発明の目的としては、加熱板による接触加
熱方法を改良することによって、上記従来技術の問題点
を解消し、複数の成形品を成形する場合の、発泡シート
の引込み合いや干渉を無くし、また定位置成形を可能に
して印刷位置ズレを無くすと共に、加熱後の発泡シート
の取扱いを容易にできる方法を開発したものである。
<Purpose> Therefore, the purpose of the present invention is to solve the above-mentioned problems of the prior art by improving the contact heating method using a heating plate, and to solve the problem of the drawing of foam sheets into each other when molding a plurality of molded products. We have developed a method that eliminates interference, enables fixed-position molding, eliminates printing position shift, and facilitates handling of the foam sheet after heating.

く構成〉 そして、上記目的を達成するだめの方法としては、シー
ト成形に使用する発泡シートを加熱軟化させる為に、発
泡シートの両面に加熱板を接触させて加熱圧縮する方法
において、発泡シートのうちの複数の成形部分を、互い
に区画する形状の凹部を、加熱板の当接面に形成して、
当該個所の発泡シートに対する伝熱を抑制し、発泡シー
トのうち各成形部分を互いに区画する位置に、加熱抑制
部分を形成することを特徴としている。
A further method to achieve the above object is to heat and compress the foam sheet by bringing heating plates into contact with both sides of the foam sheet in order to heat and soften the foam sheet used for sheet forming. A recess shaped to separate the plurality of molded parts from each other is formed on the contact surface of the heating plate,
It is characterized by suppressing heat transfer to the foamed sheet at that location and forming heat-suppressing portions at positions that separate the molded portions of the foamed sheet from each other.

〈実施例〉 次いで、この発明の実施例について、図を参照しながら
、以下に説明する。
<Example> Next, an example of the present invention will be described below with reference to the drawings.

第1図には、この発明の実施に使用する成形装置の全体
を示しており、(1)は加熱部、(2)は成形部である
。加熱部(1)から成形部(2)の間には、クランプ機
構を備えたチェーンコンベア等の、発泡シート(S)の
搬送手段を設けている。そして、発泡ポリスチレンシー
ト等の、熱可塑性樹脂からなる長尺状の発泡シート(S
)を、上記加熱部(1)から成形部(2)へと連続的に
送給可能に構成し、順次発泡シ−ト(S)を加熱軟化し
た後、所定の成形加工を施す。なお、図示した実施例で
は、成形品(F)として封状の容器を、同時に複数個並
設して成形する場合を例示している。
FIG. 1 shows the entire molding apparatus used for carrying out the present invention, in which (1) is a heating section and (2) is a molding section. A means for transporting the foam sheet (S), such as a chain conveyor equipped with a clamp mechanism, is provided between the heating section (1) and the forming section (2). Then, a long foam sheet (S
) can be continuously fed from the heating section (1) to the forming section (2), and after the foamed sheet (S) is heated and softened one after another, it is subjected to a predetermined forming process. In the illustrated embodiment, a case is illustrated in which a plurality of sealed containers are simultaneously arranged and molded as the molded product (F).

加熱部(1)としては、アルミ合金等の熱伝導性の良い
材料からなる、上下一対の加熱板(10)(10)の背
後に、加熱板(10)(10)を加熱昇温させるための
熱発生機構(11)(11)を備えてあり、加熱板(1
0)および熱発生機構(11)を一体に形成して、シリ
ンダー機構等の移動手段によって、昇降自在に設けてい
る。そして、上記加熱板(10)(10)を発泡シート
(S)の上下両面に接触させて、直接的な熱伝導によっ
て加熱軟化させると同時に、加熱板(10)(10)を
発泡シート(S)に押圧することによって圧縮するよう
になっている。
The heating section (1) is made of a material with good thermal conductivity such as aluminum alloy and is placed behind a pair of upper and lower heating plates (10) (10) in order to heat the heating plates (10) (10) to raise their temperature. The heat generating mechanism (11) (11) is equipped with a heating plate (11).
0) and the heat generating mechanism (11) are integrally formed and can be moved up and down by a moving means such as a cylinder mechanism. Then, the heating plates (10) (10) are brought into contact with the upper and lower surfaces of the foam sheet (S) to heat and soften them by direct heat conduction, and at the same time, the heating plates (10) (10) are brought into contact with the upper and lower surfaces of the foam sheet (S). ) to compress it.

加熱板(10)の詳細な構造を、第2図および第3図に
示している。即ち、上下の加熱板(10)の発泡シート
(S)に対する当接面は、全体が水平板状に形成しであ
ると共に、一部に浅い凹部(12)、および深い凹部(
13)を形成している。そして、上記浅い凹部(12)
は、発泡シート(S)のうち、成形したときに成形品の
中央部分になる個所と接触する位置に、円形状に形成さ
れてあって、加熱板(10)の先端面よりも少し凹んで
おり、外周は緩やかに傾斜して先端面に連なっている。
The detailed structure of the heating plate (10) is shown in FIGS. 2 and 3. That is, the contact surfaces of the upper and lower heating plates (10) against the foam sheet (S) are entirely formed in the shape of a horizontal plate, and have shallow recesses (12) and deep recesses (
13). And the shallow recess (12)
is formed in a circular shape at a position of the foamed sheet (S) that will come into contact with the central part of the molded product when molded, and is slightly recessed than the tip surface of the heating plate (10). The outer periphery is gently sloped and continues to the tip surface.

深い凹部(13)は、発泡シート(S)のうち、成形に
は使用されない、成形品の周辺部分になる個所と接触す
る位置に、縦横の格子溝状に形成されである。この格子
状凹部(13)の深さは、前記した浅い円形状凹部(1
2)よりもかなり深く、発泡シート(S)に加熱板(1
0)を接触させて加熱圧縮したときに、発泡シート(S
)が厚み方向に膨張しても、格子状凹部(13)の内奥
部には発泡シート(S)が接触しない程度に、深く形成
されている。
The deep recesses (13) are formed in the form of vertical and horizontal lattice grooves at positions of the foamed sheet (S) that are in contact with portions of the foamed sheet (S) that are not used for molding and will be the peripheral portions of the molded product. The depth of this lattice-shaped recess (13) is equal to the depth of the shallow circular recess (13) described above.
The heating plate (1) is placed on the foam sheet (S) much deeper than 2).
0) was heated and compressed in contact with the foam sheet (S
) is formed so deep that even if the foam sheet (S) expands in the thickness direction, the foam sheet (S) does not come into contact with the deep inner part of the lattice-shaped recess (13).

次に、以上のような構造の加熱板(10)を使用する、
発泡シート(S)の加熱方法について説明する。
Next, using the heating plate (10) having the above structure,
A method of heating the foam sheet (S) will be explained.

発泡シート(S)の両面に加熱板(1G)を押し当てて
、加熱軟化させると同時に厚み方向に圧縮するのは、従
来の加熱板(10)と同様である。そして、加熱時間ま
たは加熱板(10)の押圧力を適当に設定することによ
って、発泡シート(S)全体の加熱軟化度を調整するこ
とができる。但し、加熱板(10)の発泡シート(S)
との当接面は、全体が完全に平坦なものではなく、円形
状凹部(12)や格子状凹部(13)が形成しであるの
で、発泡シート(S)の部分によって、加熱状態が違っ
てくる。
Similar to the conventional heating plate (10), the heating plate (1G) is pressed against both sides of the foamed sheet (S) to soften it by heating and simultaneously compress it in the thickness direction. By appropriately setting the heating time or the pressing force of the heating plate (10), the degree of softening by heating of the entire foamed sheet (S) can be adjusted. However, the foam sheet (S) of the heating plate (10)
The contact surface with the foam sheet (S) is not completely flat as a whole, but has circular recesses (12) and lattice-like recesses (13), so the heating condition differs depending on the part of the foam sheet (S). It's coming.

詳しく説明すると、第2図において、まず、発泡シート
(S)の加熱前の厚みを(T)とする。この発泡シート
(S)の両面に加熱板(10)(10)を接触させて加
熱する。そして、発泡シート(S)のうち、加熱板(1
0)の先端面が接触する部分(a)では、加熱板(10
)が完全に接触し、しかも強く押圧することによって、
発泡シート(S)を充分に加熱昇温し、発泡シート(S
)が完全に軟化すると同時に、厚み方向に大きく圧縮さ
れている。従って、当該部分の厚み(T1)は、加熱前
の厚み(T)よりもかなり薄くなる。
To explain in detail, in FIG. 2, first, let (T) be the thickness of the foam sheet (S) before heating. Both sides of this foamed sheet (S) are brought into contact with heating plates (10) (10) and heated. Then, among the foam sheets (S), heating plates (1
In the part (a) where the tip surface of the heating plate (10
) are in complete contact and pressing strongly,
The foam sheet (S) is sufficiently heated to raise its temperature.
) is completely softened and at the same time is greatly compressed in the thickness direction. Therefore, the thickness (T1) of this portion is considerably thinner than the thickness (T) before heating.

次に、発泡シート(S)のうち、前記加熱板(10)の
浅い円形状凹部(12)が接触する部分(b)では、発
泡シート(S)は前記部分(a)に比べて、比較的弱く
圧縮されることになり、加熱軟化度も前記部分(a)よ
りは少なくなる。但し、成形工程における膨出変形に必
要な程度には、加熱軟化させている。
Next, in the portion (b) of the foam sheet (S) that is in contact with the shallow circular recess (12) of the heating plate (10), the foam sheet (S) is comparatively smaller than the portion (a). It will be compressed to a weaker target, and the degree of heat softening will be lower than that of the part (a). However, it is heated and softened to the extent necessary for expansion deformation in the molding process.

さらに、発泡シート(S)のうち、加熱板(10)の深
い格子状凹部(13)に接触する部分(C)では、発泡
シート(S)に加熱板(10)が全く接触せず、加熱が
抑制されるため、当該個所ではほとんど加熱軟化される
ことがなく、また圧縮されることもないので、発泡シー
ト(S)の厚みは当初の原反厚み(T)のままである。
Furthermore, in the portion (C) of the foam sheet (S) that contacts the deep lattice-shaped recesses (13) of the heating plate (10), the heating plate (10) does not come into contact with the foam sheet (S) at all, and the heating plate (10) is not heated. Since the foamed sheet (S) is suppressed, there is almost no heating and softening at that location, and there is no compression, so the thickness of the foamed sheet (S) remains the same as the original thickness (T).

なお、第3図に示した加熱板(10)では、全体の外周
端辺については、凹部(13)を形成していないが、加
熱された発泡シート(S)においては、加熱板(10)
より外方部分では当然加熱板(10)に接触せず、従っ
て加熱板(10)全体の″外周端辺に相当する位置にも
、上記と同様の加熱抑制部分(C)が形成されることに
なる。即ち、複数の成形部分が、加熱抑制部分(C)で
区画されると共に、各成形部分の外周が加熱抑制部分(
C)で囲まれていることになる。
Note that the heating plate (10) shown in FIG. 3 does not have a recess (13) on the entire outer peripheral edge, but in the heated foam sheet (S), the heating plate (10)
Naturally, the outer part does not come into contact with the heating plate (10), and therefore a heating suppressing part (C) similar to the above is formed also at a position corresponding to the outer peripheral edge of the entire heating plate (10). That is, the plurality of molded parts are divided by the heat suppression part (C), and the outer periphery of each molded part is defined by the heat suppression part (C).
It is surrounded by C).

以上のような状態で、部分的に加熱軟化度の違う個所(
a)〜(C)を形成した発泡シート(S)を、成形部(
aに送り込んで、所定の成形加工を施すことになる。
In the above state, there are places where the degree of heat softening is different (
The foamed sheet (S) formed with a) to (C) is placed in the molding section (
The material is sent to a part a and subjected to a predetermined molding process.

成形部(2)の構造について説明すると、第1図に示す
ように、上下一対の雌雄の金型(20)(21)をシリ
ンダー機構等によって、型締め型開き自在に構成し、上
下の金型(20) (21)間に加熱軟化した発泡シー
ト(S)を挟み込み、金型(20)(21)形状に沿っ
て膨出変形させて、成形品(F)を成形製造するもので
ある。上記金型(2G) (21)や成形部(2)全体
の構造は、従来の通常の、真空成形、圧空成形、その他
の各種シート成形用の成形機構と、全く同様のもので実
施できる。
To explain the structure of the molding section (2), as shown in Fig. 1, a pair of upper and lower male and female molds (20, 21) are constructed so that they can be clamped and opened using a cylinder mechanism, etc. A heated and softened foam sheet (S) is sandwiched between the molds (20) and (21), and is bulged and deformed along the shape of the molds (20) and (21) to produce a molded product (F). . The structure of the mold (2G) (21) and the molding section (2) as a whole can be implemented using the same conventional molding mechanisms for vacuum forming, pressure forming, and other types of sheet forming.

そして、成形工程においては、加熱軟化された発泡シー
ト(S)のうち、前記したように、加熱軟化度が中間の
、部分(b)は、従来の成形方法と同様に膨出成形され
て、成形品(F)のうちの中央部分になる。次に、加熱
軟化度の高い部分(b)は、成形品(F)の周囲で、大
きく伸長変形させられ、中央側に引込まれる引込み部分
となる。また、加熱軟化度が最も低く、はとんど加熱軟
化されていない部分(C)は、はとんど変形せず、成形
品(「)の周辺で、成形には全く使用されないスクラッ
プ部分になる。従って、成形品(nとしては、発泡シー
ト(S)のうちの、中加熱部分(b)および高加熱部分
(a)によって成形されることになる。
Then, in the molding process, the portion (b) of the heat-softened foam sheet (S), which has an intermediate degree of heat-softening, is bulge-molded in the same manner as in the conventional molding method, as described above. This will be the center part of the molded product (F). Next, the portion (b) having a high degree of heat softening is largely elongated and deformed around the molded article (F), and becomes a retractable portion that is pulled toward the center. In addition, the part (C), which has the lowest degree of heat softening and is hardly softened by heat, is hardly deformed and becomes a scrap part around the molded product ( ) that is not used at all for molding. Therefore, the molded product (n) is formed by the medium heating portion (b) and the high heating portion (a) of the foamed sheet (S).

以上に述べた発泡シートの加熱方法のうち、発泡シート
(S)を加熱する加熱板(10)としては、発泡シート
(S)に並設形成する、複数の成形品(F)の形状や配
置に応じて、各成形品(F)同士を互いに区画する位置
に、深い凹部(13)を形成しておけばよいのであり、
凹部(13)の形状としては、図示した縦横の格子溝状
のもののほか、適宜変更して実施できる。
Among the foam sheet heating methods described above, as the heating plate (10) for heating the foam sheet (S), the shape and arrangement of a plurality of molded products (F) formed in parallel on the foam sheet (S) are used. According to this, deep recesses (13) may be formed at positions that separate the molded products (F) from each other.
The shape of the recess (13) may be modified as appropriate in addition to the illustrated vertical and horizontal lattice grooves.

そして、加熱板(10)には、必要に応じて、任意の位
置に、任意の形状あるいは深さで、凹部(13)以外の
凹凸形状を付加形成することができ、また凹部(12)
については形成しない場合もある。
The heating plate (10) can be additionally formed with uneven shapes other than the recesses (13) at any position, at any shape, or at any depth, as necessary.
In some cases, it may not be formed.

そして、図示した実施例では、加熱板(10)の先端面
を略平坦にして、所要の凹部(12)(13)を形成し
ているが、平坦な先端面に、部分的な凸部を形成するこ
ともできる。
In the illustrated embodiment, the distal end surface of the heating plate (10) is made substantially flat to form the required recesses (12) and (13), but partial convex portions are formed on the flat distal end surface. It can also be formed.

また、凹部(12)(13)等の深さが深い程、発泡シ
ート(S)に対する加熱軟化度および圧縮量が少なくな
り、凹部(13)のように、発泡シート(S)に全く接
触しなければ、はとんど加熱軟化および圧縮が行われな
い。従って、凹部(12)(13)等の深さ、または凸
部の高さを、遺骨設定することによって、発泡シート(
S)に対する加熱軟化度、および圧縮量を自由に調整で
きる。
In addition, the deeper the depth of the recesses (12), (13), etc., the lower the degree of heat softening and the amount of compression for the foam sheet (S). Otherwise, there will be little heat softening and compaction. Therefore, by setting the depth of the recesses (12), (13), etc. or the height of the protrusions, the foam sheet (
The degree of heat softening and compression amount for S) can be freely adjusted.

そして、成形工程においては、発泡シート(S)のうち
、加熱軟化度の高い高加熱部分(a)は、前記引込み部
分のほか、特に大きく膨出変形させたり、強く伸長変形
する部分に対応させればよい。
In the forming process, the highly heated portion (a) of the foamed sheet (S) with a high degree of heat softening is set to correspond to the retracted portion as well as the portion that is particularly greatly bulged and deformed or that is strongly elongated. That's fine.

また、実施上、発泡シート(S)の各部に対する加熱軟
化度を、成形工程において必要とされる膨出変形器に対
応させて、さらに細かく複数段階に設定することもでき
る。例えば、成形品(F)のうち、細かな形状部分や複
雑な凹凸形状等に対応する部分の、発泡シート(S)に
対しては、比較的加熱軟化度を高く設定し、それ程変形
を必要としない部分では、加熱軟化度を低く設定してお
けばよい。。
Further, in practice, the degree of heat softening of each part of the foamed sheet (S) can be set in a plurality of finer stages in accordance with the expansion deformer required in the molding process. For example, for the foamed sheet (S) of the molded product (F), which corresponds to parts with fine shapes or complex uneven shapes, the degree of heat softening is set relatively high, and deformation is required to that extent. In areas where this is not the case, the degree of heat softening may be set low. .

さらに、はとんど加熱軟化していない加熱抑制部分(C
)は、複数の成形品(F)を区画する外周辺に形成して
、発泡シート(S)の位置ズレや変形を防止するために
有効であるが、成形品(F)の内部でも、変形を必要と
しない部分、積極的に変形を阻止しなければならない部
分等に、加熱抑制部分(C)を形成することができる。
Furthermore, the heat-suppressed part (C
) is effective in preventing displacement and deformation of the foam sheet (S) by forming it on the outer periphery that partitions multiple molded products (F), but it also prevents deformation inside the molded product (F). The heat suppression portion (C) can be formed in a portion where deformation is not required, a portion where deformation must be actively prevented, etc.

次に、加熱抑制部分(C)の形成については、第5図に
示すように、加熱板(10)の内奥部に、耐熱性のある
断熱材(14)を埋設しておくと、加熱板(10)から
発泡シート(S)に対する伝熱を、より確実に抑制でき
、加熱軟化度が一層少なく、変形し難い加熱抑制部分(
C)が形成できる。
Next, regarding the formation of the heating suppressing portion (C), as shown in FIG. The heat-suppressed portion (
C) can be formed.

次に、図示した加熱板(10)の凹凸形状は、発泡シー
ト(S)の上下で、全く同一形状に形成しているが、上
下の加熱板(10)で凹凸形状を違えたり、一方の加熱
板(10)のみに凹凸形状を形成しておいてもよい。
Next, the uneven shape of the heating plate (10) shown in the figure is formed in exactly the same shape on the upper and lower sides of the foam sheet (S), but the uneven shape of the upper and lower heating plates (10) may be different, or The uneven shape may be formed only on the heating plate (10).

また、加熱板(10)を加熱昇温させる為の、熱発生機
構(11)としては、電熱ヒーターを備えたもの、蒸気
等の加熱媒体を導入可能に構成したもの等、従来の加熱
構造と同様に、種々の構造のもので実施可能である。
In addition, the heat generation mechanism (11) for heating the heating plate (10) may be a conventional heating structure, such as one equipped with an electric heater or one configured to allow introduction of a heating medium such as steam. Similarly, various structures can be used.

次に、上述の実施例では、発泡シート(S)に対して、
加熱板(10)を両面から押し当てて、加熱軟化と同時
に圧縮しているが、この圧縮によって、発泡シー1−(
S)を加熱軟化させたときに生じる、厚み方向の発泡膨
張および平面方向の収縮を押さえることができる。そし
て、発泡シート(S)の厚みを、成形に適当な一定以下
の厚みに、任意に調整できると共に、発泡シート(S)
が反ったり弛んだりするのを規制でき、平面方向の変形
や移動も防止できる。また、発泡シート(S)の両面を
平滑化する効果もある。なお、加熱軟化度を高めようと
するほど、発泡シート(S)に対して加熱板(10)を
強く押し付ける必要があるので、圧縮量も多くなる。
Next, in the above example, for the foam sheet (S),
The heating plate (10) is pressed against both sides to compress the foamed sheet 1-(
It is possible to suppress foaming expansion in the thickness direction and contraction in the plane direction that occur when S) is heated and softened. The thickness of the foam sheet (S) can be arbitrarily adjusted to a certain thickness or less suitable for molding, and the foam sheet (S)
It is possible to control the warping and loosening of the material, and also prevent deformation and movement in the plane direction. It also has the effect of smoothing both sides of the foam sheet (S). It should be noted that the higher the heating softening degree is, the more strongly it is necessary to press the heating plate (10) against the foamed sheet (S), so the amount of compression also increases.

この発明の加熱方法で加熱する発泡シート(S)として
は、ポリスチレンのほか、ポリエチレン、ポリプロピレ
ン、その他の各種熱可塑性樹脂からなる発泡シート(S
)が使用でき、発泡シート(S)の片面または両面に、
上記同様の各種熱可塑性樹脂からなる非発泡シートまた
はフィルムがW4Miされたものでも実施可能である。
The foamed sheet (S) to be heated by the heating method of this invention may be made of polystyrene, polyethylene, polypropylene, or other various thermoplastic resins.
) can be used, and on one or both sides of the foam sheet (S),
It is also possible to use non-foamed sheets or films made of various thermoplastic resins similar to those described above that have been subjected to W4Mi.

さらに、発泡シート(S)の表面に、適宜印刷模様が形
成された、印刷シートを使用するのが好適である。
Furthermore, it is preferable to use a printed sheet in which a printed pattern is appropriately formed on the surface of the foamed sheet (S).

また、成形製造する成形品(F)としては、図示した片
状容器等の各種包装容器、その他の成形品に自由に適用
できるものである。
Moreover, the molded product (F) to be molded and manufactured can be freely applied to various packaging containers such as the illustrated flaky container, and other molded products.

〈効果〉 以上のごとく構成された、この発明の加熱方法によれば
、シート成形に使用する発泡シート(S)に対して、複
数の成形品(F)部分を互いに区画する形状の、凹部(
13)が形成された加熱板(10)を接触させた状態で
、発泡シート(S)を加熱軟化させることによって、発
泡シート(S)のうち、各成形品(F)を区画する位置
に、他部分に比べてはとんど加熱軟化されない、凹部(
13)に対応する形状の加熱抑制部分(C)を形成する
ものである。
<Effects> According to the heating method of the present invention configured as described above, the recesses (
By heating and softening the foam sheet (S) while contacting the heating plate (10) formed with The concave part (
A heating suppressing portion (C) having a shape corresponding to 13) is formed.

そして、はとんど加熱軟化しておらず、変形し難い加熱
抑制部分(C)が、複数の成形品(F)の外周辺で、各
成形品(F)を区画する位置に形成されるため、発泡シ
ート(S)の変形や位置ズレを良好に防止でき、定位置
成形を可能にして、印刷ズレの発生を防止できる。また
、発泡シート(S)全体の変形を防止できることによっ
て、加熱軟化した発泡シート(S)の取扱いも容易で、
成形用の金型(20)(21)への配置も正確に行える
Then, heat-suppressing portions (C) that are hardly softened by heating and are difficult to deform are formed on the outer periphery of the plurality of molded products (F) at positions that partition each molded product (F). Therefore, deformation and misalignment of the foam sheet (S) can be effectively prevented, position molding can be performed, and printing misalignment can be prevented. In addition, by being able to prevent the entire foam sheet (S) from deforming, it is easy to handle the foam sheet (S) that has been softened by heating.
The arrangement in the molds (20) and (21) for molding can also be performed accurately.

さらに、複数の成形品(F)を同時に並設成形する成形
工程において、隣接する成形品(F)部分の互いの境界
を越えて、発泡シート(S)が引込まれたり、互いに干
渉するのを確実に防止でき、前記定位置成形や印刷ズレ
の防止効果も、より有効に発揮できる。
Furthermore, in the molding process in which multiple molded products (F) are simultaneously molded side by side, the foam sheets (S) are prevented from being drawn in or interfering with each other beyond the boundaries of adjacent molded product (F) parts. This can be reliably prevented, and the effect of preventing the above-mentioned position molding and printing misalignment can be more effectively exhibited.

特に、成形品(F)の周囲に中央側よりも加熱軟化度の
高い高加熱部分(a)を形成して、成形時の引込み吊を
増大させようとする場合には、非常に柔軟で変形し易い
高加熱部分(a)の外側に、この発明における、変形し
難い加熱抑制部分(C)を形成しておくことによって、
発泡シート(S)全体の変形防止や、隣接する成形品(
F)部分における引込み合いや干渉の防止等、極めて顕
著な効果を発揮できるものである。
In particular, when trying to increase the retractability during molding by forming a highly heated part (a) around the molded part (F) that has a higher degree of heat softening than the central part, it becomes extremely flexible and deformable. By forming the heat-suppressing portion (C) that is difficult to deform according to the present invention on the outside of the highly heated portion (a) that is easily deformed,
Prevents deformation of the entire foam sheet (S) and prevents adjacent molded products (
F) It is possible to exhibit extremely remarkable effects such as prevention of attraction and interference in the part.

く具体例〉 以上に述べた、この発明の効果を実証するために、具体
的に加熱板(10)を使用して、発泡シート(S)の加
熱および成形を行った。
Specific Example> In order to demonstrate the effects of the present invention described above, a heating plate (10) was specifically used to heat and mold a foamed sheet (S).

発泡シート(S)としては、厚さT=2.5mmの発泡
ポリスチレンシートを使用し、成形品(F)として、第
4図に示すような、封状のカップ容器を成形する。
A foamed polystyrene sheet with a thickness T of 2.5 mm is used as the foamed sheet (S), and a sealed cup container as shown in FIG. 4 is molded as the molded product (F).

加熱板(10)の構造としては、第2図および第3図に
おいて、円形状凹部(12)は直径D=160+an+
で深さ0.3mmに形成し、格子状四部(13)は幅W
=5mmで深さ5m111に形成してあり、複数の成形
品間のピッチP=165uに形成しである。
As for the structure of the heating plate (10), in FIGS. 2 and 3, the circular recess (12) has a diameter D=160+an+
with a depth of 0.3 mm, and the four lattice parts (13) have a width W.
= 5mm and a depth of 5m111, and the pitch between the plurality of molded products is P = 165u.

そして、発泡シート(S)を表面温度150℃で2秒間
;加熱軟化することによって、発泡シート(S)は中加
熱部分(b)の厚みT2がiu+、高加熱部分(a)の
厚みT1がQ、7mmに圧縮され、加熱抑制部分(C)
では、原反の厚み2.5111のままであった。
Then, by heating and softening the foam sheet (S) at a surface temperature of 150° C. for 2 seconds, the foam sheet (S) has a thickness T2 of the medium heating portion (b) of iu+ and a thickness T1 of the high heating portion (a) of the foam sheet (S). Q, compressed to 7mm, heat suppressed part (C)
In this case, the thickness of the original fabric remained at 2.5111.

以上のようにして、部分的に加熱軟化度の違う発泡シー
ト(S)を、シート成形用の成形部(21で成形したと
ころ、成形品(F)の厚みや形状は良好で品質の優れた
ものが成形できた。また、印刷ズレも無く、外観的にも
極めて体裁の良い成形品(F)が得られた。
As described above, when the foamed sheet (S) having partially different degrees of heat softening was molded in the molding section (21) for sheet molding, the thickness and shape of the molded product (F) were good and the quality was excellent. A molded product (F) was obtained which had no printing deviation and had an extremely good appearance.

【図面の簡単な説明】[Brief explanation of the drawing]

図はこの発明の実施例を示すものであり、第1図は成形
装置全体の概略構造図、第2図は加熱板部分の詳細断面
図、第3図は加熱板の平面図、第4図は成形品の半断面
図、第5図は加熱板の変更例の断面図で、ある。 (1)・・・・・・加熱部、(10)・・・・・・加熱
板、(12)(13)・・・・・・凹部、(2)・・・
・・・成形部、(S)・・・・・・発泡シート、(a)
・・・・・・高加熱Is分、(b)、・・・・・・中加
熱部分、(C)・・・・・・加熱抑制部分、(F)・・
・・・・成形品。
The drawings show an embodiment of the present invention, in which Fig. 1 is a schematic structural diagram of the entire molding device, Fig. 2 is a detailed sectional view of the heating plate portion, Fig. 3 is a plan view of the heating plate, and Fig. 4. 5 is a half sectional view of the molded product, and FIG. 5 is a sectional view of a modified example of the heating plate. (1)... Heating part, (10)... Heating plate, (12) (13)... Concavity, (2)...
... Molding part, (S) ... Foam sheet, (a)
...High heating Is portion, (b), ...Medium heating portion, (C)...Heating suppression portion, (F)...
····Molding.

Claims (1)

【特許請求の範囲】 1、シート成形に使用する発泡シートを加 熱軟化させる為に、発泡シートの両面に 加熱板を接触させて加熱圧縮する方法に おいて、発泡シートのうちの複数の成形 部分を、互いに区画する形状の凹部を、 加熱板の当接面に形成して、当該個所の 発泡シートに対する伝熱を抑制し、発泡 シートのうち各成形部分を互いに区画す る位置に、加熱抑制部分を形成すること を特徴とするシート成形における発泡シ ートの加熱方法。 2、発泡シートの各成形部分のうち、非加 熱部分の内側において、成形時に成形品 周囲から成形品中央側に引き込まれる部 分、に対応する加熱板の当接面よりも、 成形品中央側に対応する加熱板の当接面 を凹ませて形成し、発泡シートのうち、 上記引込み部分の加熱軟化度を、中央部 分の加熱軟化度よりも大きく形成する上 記特許請求の範囲第1項記載のシート成 形における発泡シートの加熱方法。 3、加熱板に形成する、加熱抑制部分形成 用の凹部の内部に、断熱材を埋設してお き、発泡シートに対する伝熱を抑制する 上記特許請求の範囲第1項記載のシート 成形における発泡シートの加熱方法。[Claims] 1. Processing the foam sheet used for sheet molding on both sides of the foam sheet for heat softening. A method of heating and compressing by bringing a heating plate into contact with the Molding several of the foam sheets A recess with a shape that separates the parts from each other, Formed on the contact surface of the heating plate and Suppresses heat transfer to foam sheet and foams Separate each molded part of the sheet from each other. Forming a heating suppressing part at a position where Foamed silicone for sheet molding featuring How to heat the stove. 2. Of each molded part of the foam sheet, unprocessed Inside the heated part, the molded product is heated during molding. The part that is drawn into the center of the molded product from the periphery minutes, than the contact surface of the heating plate corresponding to Contact surface of the heating plate corresponding to the center side of the molded product Of the foam sheet, The heating softening degree of the above retracted part is The heating softening degree is greater than the above formed The sheet composition according to claim 1 How to heat foam sheets in shape. 3. Forming a heating suppression part on the heating plate Insulating material is buried inside the recess for and suppresses heat transfer to the foam sheet. Sheet according to claim 1 above Method of heating foam sheets during molding.
JP6834085A 1985-03-29 1985-03-29 Method for heating foamed sheet in molding of sheet Granted JPS61225024A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6834085A JPS61225024A (en) 1985-03-29 1985-03-29 Method for heating foamed sheet in molding of sheet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6834085A JPS61225024A (en) 1985-03-29 1985-03-29 Method for heating foamed sheet in molding of sheet

Publications (2)

Publication Number Publication Date
JPS61225024A true JPS61225024A (en) 1986-10-06
JPH0155984B2 JPH0155984B2 (en) 1989-11-28

Family

ID=13371010

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6834085A Granted JPS61225024A (en) 1985-03-29 1985-03-29 Method for heating foamed sheet in molding of sheet

Country Status (1)

Country Link
JP (1) JPS61225024A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0448249A2 (en) * 1990-03-19 1991-09-25 Illinois Tool Works Inc. Method and die for forming a shaped component
FR2767741A1 (en) * 1997-08-28 1999-02-26 Bosch Gmbh Robert THERMOFORMING MACHINE
FR2827210A1 (en) * 2001-07-13 2003-01-17 Erca Formseal Plastic recipient thermoforming procedure uses strip with alternating thick and thin zones to reduce waste

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58110224A (en) * 1981-12-23 1983-06-30 Nippon Zanpatsuku Kk Heat-molding method for synthetic resin foaming sheet
JPS59199206A (en) * 1983-04-27 1984-11-12 Sekisui Plastics Co Ltd Method and apparatus for heating thermoplastic resin sheet

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58110224A (en) * 1981-12-23 1983-06-30 Nippon Zanpatsuku Kk Heat-molding method for synthetic resin foaming sheet
JPS59199206A (en) * 1983-04-27 1984-11-12 Sekisui Plastics Co Ltd Method and apparatus for heating thermoplastic resin sheet

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0448249A2 (en) * 1990-03-19 1991-09-25 Illinois Tool Works Inc. Method and die for forming a shaped component
FR2767741A1 (en) * 1997-08-28 1999-02-26 Bosch Gmbh Robert THERMOFORMING MACHINE
FR2827210A1 (en) * 2001-07-13 2003-01-17 Erca Formseal Plastic recipient thermoforming procedure uses strip with alternating thick and thin zones to reduce waste

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