JPS639969B2 - - Google Patents
Info
- Publication number
- JPS639969B2 JPS639969B2 JP58112549A JP11254983A JPS639969B2 JP S639969 B2 JPS639969 B2 JP S639969B2 JP 58112549 A JP58112549 A JP 58112549A JP 11254983 A JP11254983 A JP 11254983A JP S639969 B2 JPS639969 B2 JP S639969B2
- Authority
- JP
- Japan
- Prior art keywords
- heating
- sheet
- hot plate
- molding
- heated
- 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
Links
- 238000010438 heat treatment Methods 0.000 claims description 85
- 238000000034 method Methods 0.000 claims description 35
- 238000000465 moulding Methods 0.000 claims description 27
- 229920003002 synthetic resin Polymers 0.000 claims description 9
- 239000000057 synthetic resin Substances 0.000 claims description 9
- 229920001169 thermoplastic Polymers 0.000 claims description 9
- 239000004416 thermosoftening plastic Substances 0.000 claims description 9
- 239000006260 foam Substances 0.000 claims description 6
- 238000003856 thermoforming Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 description 10
- 238000007639 printing Methods 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000002950 deficient Effects 0.000 description 4
- 239000004794 expanded polystyrene Substances 0.000 description 4
- 229920005669 high impact polystyrene Polymers 0.000 description 4
- 239000004797 high-impact polystyrene Substances 0.000 description 4
- 239000011810 insulating material Substances 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 230000000873 masking effect Effects 0.000 description 3
- -1 polyethylene Polymers 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920006248 expandable polystyrene Polymers 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 229920006015 heat resistant resin Polymers 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
- 238000007666 vacuum forming Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C51/00—Shaping 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
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/42—Heating or cooling
- B29C51/421—Heating or cooling of preforms, specially adapted for thermoforming
- B29C51/422—Heating or cooling of preforms, specially adapted for thermoforming to produce a temperature differential
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は熱可塑性合成樹脂シートの加熱成形方
法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method of thermoforming a thermoplastic synthetic resin sheet.
熱可塑性合成樹脂シートの成形において熱効率
の良否が、また温度管理の良否が、成形品に与え
る影響はきわめて大きい。一般に、加熱方法とし
ては、伝導加熱、輻射加熱および対流加熱の三つ
があつて目的に応じて適宜選択される。輻射加熱
および対流加熱は一般的に広く利用されている方
法であるが、加熱効率の点および温度管理の精度
に難点がある。一方伝導加熱は、通常、熱板が使
用され加熱効率の点で優れているが、輻射加熱、
対流加熱の場合に比して設備費用等の点で難があ
る。これらの加熱の目的は、マクロ的には一回の
成形における成形面全体を均一に加熱することに
ある。しかしながらミクロ的には、部分的に加熱
の程度を不均一にすることが望ましい場合もない
ではない。例えば発泡ポリスチレンシートの深絞
り成形品（例えばコツプ）を得る目的のために、
成形部分の周囲部分の温度は、シートの軟化温度
近傍に加熱するが、コツプの底部を中心とした成
形部分はそれよりも低く加熱しておいて、コツプ
の底部の肉厚を充分に保持し、且つ成形部分への
周囲部分からのシートの引き込みを容易にしよう
とする方法である。この方法は上記の不均一加熱
を、成形部分の周囲シートを押さえるフランジお
よびシート押え射手に加熱手段を設けることによ
り達成している優れた方法であるが、装置が複雑
となる欠点がある。
In molding a thermoplastic synthetic resin sheet, the quality of thermal efficiency and the quality of temperature control have an extremely large influence on the molded product. In general, there are three heating methods: conduction heating, radiation heating, and convection heating, which are appropriately selected depending on the purpose. Radiant heating and convection heating are generally widely used methods, but they have drawbacks in terms of heating efficiency and accuracy of temperature control. On the other hand, conduction heating usually uses a hot plate and is superior in terms of heating efficiency, but radiation heating
Compared to convection heating, this method has disadvantages in terms of equipment costs, etc. The purpose of this heating is to uniformly heat the entire molding surface in one molding from a macroscopic perspective. However, on a microscopic level, it may be desirable to make the degree of heating non-uniform in some areas. For example, for the purpose of obtaining deep drawn products (e.g. cotspu) of expanded polystyrene sheets,
The temperature around the molded part is heated to near the softening temperature of the sheet, but the molded part centered on the bottom of the tip is heated to a lower temperature to maintain sufficient wall thickness at the bottom of the tip. , and which attempts to facilitate the drawing of sheets from the surrounding area into the molded part. This method is an excellent method in which the above-mentioned non-uniform heating is achieved by providing heating means in the flange that presses the surrounding sheet of the molded part and the sheet presser, but it has the disadvantage that the apparatus is complicated.
一方マスキング加熱という方法が知られてい
る。この方法は、ヒーターとシートとの間にマス
キング材を使用して加熱調節を行う方法である。
一般的には、この方法は輻射加熱における均一加
熱の困難さから結果として生ずる過加熱を調節す
るために、金網等をヒーターとシートとの間に適
宜挿入するものである。シートの伸びの部分調節
のためにマスキング材を使用して部分的に不均一
ならしめるように調節することもあるが、その例
は輻射加熱におけるものであつて実施は容易であ
るが精度的には充分なものであるとはいい難い。 On the other hand, a method called masking heating is known. This method uses a masking material between the heater and the sheet to adjust the heating.
Generally, this method involves appropriately inserting a wire mesh or the like between the heater and the sheet in order to control overheating resulting from the difficulty of uniform heating in radiant heating. In order to partially adjust the elongation of the sheet, a masking material may be used to make it partially non-uniform, but this example is for radiant heating, and although it is easy to implement, it is not accurate. cannot be said to be sufficient.
また特開昭58−98218号公報に記載された如く、
連続した加熱板に部分的に凹部を設けたり、耐熱
性樹脂を設けることにより不均一加熱を行つて成
形をする方法も知られているが、この方法ではシ
ートに予め印刷された模様等が所定に位置に来る
ようにして成形したい場合には印刷合わせが困難
であるという問題がある。 Also, as described in Japanese Patent Application Laid-Open No. 58-98218,
There is also a known method of forming by unevenly heating a continuous heating plate by providing partial recesses or heat-resistant resin, but in this method, a pre-printed pattern etc. There is a problem in that when it is desired to mold the material so that it is positioned at
熱板加熱方法は一般に装置も大型となり、こま
わりがきかない難点があるが、加熱精度、熱効率
の上から優れている。本発明は熱板加熱方法の利
点をいかすとともに、熱板加熱方法の難点を解消
し、しかもミクロ的不均一加熱において、特に印
刷合わせ成形を容易とした加熱成形方法を提供す
ることを目的とするものである。
The hot plate heating method generally requires large equipment and has the disadvantage of being difficult to rotate, but it is superior in terms of heating accuracy and thermal efficiency. It is an object of the present invention to provide a heat forming method that takes advantage of the advantages of the hot plate heating method, eliminates the drawbacks of the hot plate heating method, and facilitates printing and molding, especially in micro-nonuniform heating. It is something.
即ち本発明は少なくとも１層の熱可塑性合成樹
脂発泡シートからなるシートを熱板にて両面から
加熱し、その後成形する方法であつて、相互に分
離して形成され、且つシートに対する面に加熱補
助具を設けてシートに対する面に部分的に熱伝導
性の差を設けてなる複数の分割された熱板により
シートを相対的に主として成形部を高温に、成形
部の中央部をそれよりも低温に、且つ成形部の周
囲部分が更に低温となるように加熱することを特
徴とする熱可塑性合成樹脂シートの加熱成形方法
を要旨とするものである。 That is, the present invention is a method in which a sheet consisting of at least one layer of thermoplastic synthetic resin foam sheet is heated from both sides with a hot plate, and then molded, the sheets are formed separately from each other, and heating assistance is applied to the surface facing the sheet. A plurality of divided heating plates each having a partial difference in thermal conductivity on the surface facing the sheet are used to relatively heat the sheet to a high temperature mainly in the forming part and to a lower temperature in the center of the forming part. The gist of the present invention is to provide a method for thermoforming a thermoplastic synthetic resin sheet, which is characterized in that heating is performed so that the surrounding area of the molding part is heated to a lower temperature.
本発明において、熱可塑性合成樹脂シートは、
少なくとも１層の熱可塑性合成樹脂発泡シートか
らなるものであり、該発泡シート（例えば、発泡
ポリスチレンシート、発泡ポリオレフインシート
等）のみからなる単層シートや、発泡シートを少
なくとも１層含む積層シートである。例えば、発
泡シートの片面又は両面にハイインパクトポリス
チレンシートをラミネートしたシート、発泡ポリ
エチレンシートの両面にポリエチレンシートおよ
びハイインパクトポリスチレンシートをそれぞれ
ラミネートしたシート等が挙げられる。 In the present invention, the thermoplastic synthetic resin sheet is
It is composed of at least one layer of thermoplastic synthetic resin foam sheet, and is a single layer sheet consisting only of the foam sheet (for example, a foamed polystyrene sheet, a foamed polyolefin sheet, etc.), or a laminated sheet containing at least one layer of the foam sheet. . Examples include a foamed sheet with a high-impact polystyrene sheet laminated on one or both sides, a foamed polyethylene sheet with a polyethylene sheet and a high-impact polystyrene sheet laminated on both sides, and the like.
熱板はシートの両面に使用する。通常シートは
加熱補助具のシートに対する面と実質的に接触す
るようにして加熱される。上下の熱板間隔は一般
にはシート厚（一次発泡シート厚）より幾分少な
目が好ましい。また本発明における熱板による加
熱成形は、温間成形および冷間成形についても好
適に適用されうる。 Heat plates are used on both sides of the sheet. Typically, the sheet is heated in substantial contact with the surface of the heating aid against the sheet. Generally, it is preferable that the distance between the upper and lower hot plates is somewhat smaller than the sheet thickness (primary foam sheet thickness). Furthermore, the heat forming using a hot plate in the present invention can also be suitably applied to warm forming and cold forming.
成形方法は、真空成形、圧空成形のほか、これ
らの応用としての、フリードローイング成形、プ
ラグ・アンド・リング成形、リツジ成形、マツチ
ド・モールド成形、ストレート成形、ドレープ成
形、リバースドロー成形、エアスリツプ成形、プ
ラグアシスト成形、プラグアシストリバースドロ
ー成形等およびこれらの組合わせの何れの方法に
も適用しうる。 Molding methods include vacuum forming, pressure forming, and their applications such as free drawing forming, plug and ring forming, rigid forming, mated molding, straight forming, drape forming, reverse draw forming, air slip forming, It can be applied to any method such as plug assist molding, plug assist reverse draw molding, etc., or a combination thereof.
本発明に使用される熱板は内部に適宜ヒーター
が内蔵されているものであるが、これが一回成形
面１（シヨツト面）に対して第１図（平面図）の
如く連続した加熱板２ではなく、相互に分離して
形成された複数の分割した熱板であるところに特
徴を有する。即ち相互に分離してなる複数の分割
した熱板を設けることにより、連続した加熱板に
おいて発生し易い加熱面の場所の違いによる温度
差（バラツキ）を改善できるとともに、熱板によ
る加熱部分を成形部に対応させることにより成形
部の周囲部分（非成形部）はほとんど加熱される
ことがなく、この結果、印刷合わせ成形が容易と
なる。従つて本発明においては一回成形面１に対
し、熱板３との対応のある部分と、ない部分とが
ある第２図，（平面図）の如き配置となる。
これらの相互に分離した熱板３は、適宜支持体４
によつて支持される。第３図（は要部断面図、
はその要部平面図）はその一例である。熱板３
をすべて支持体４で一体的に結合することも、二
組又はそれ以上の支持体により、二又はそれ以上
の組に分けることも可能である。 The hot plate used in the present invention has an appropriate heater built-in, and once this hot plate 2 is connected to the molding surface 1 (shot surface) as shown in FIG. 1 (top view), Rather, it is characterized by a plurality of divided hot plates formed separately from each other. In other words, by providing a plurality of divided heating plates that are separated from each other, it is possible to improve the temperature difference (variation) due to differences in the location of the heating surface that tends to occur with continuous heating plates, and it is also possible to form the heated part by the heating plate. By making it correspond to the molded part, the surrounding part (non-molded part) of the molded part is hardly heated, and as a result, printing and molding becomes easy. Therefore, in the present invention, the one-time molding surface 1 is arranged as shown in FIG. 2 (plan view), in which there are portions that correspond to the hot plate 3 and portions that do not.
These mutually separated hot plates 3 are suitably supported by a support 4.
Supported by. Figure 3 (is a sectional view of the main part,
is a plan view of the main part) is an example. hot plate 3
It is possible to combine all of them integrally with the support 4, or to divide them into two or more sets using two or more sets of supports.
不均一加熱法には大別して周囲部分高温加熱法
と周囲部分低温加熱法があり、本発明において採
用する不均一加熱は周囲部分低温加熱法であり、
本発明では成形部分を高温に、成形部の中央部を
それよりも低温に、且つ成形部の周囲部分が更に
低温となるように加熱する方法を採用する。本発
明においては成形部分、成形部分の中央部のそれ
ぞれの部分において温度勾配を与えることも好適
な実施態様の一つである。これらの場合における
低温、高温とは相対的なものであつて、一般的に
はシートの軟化温度および加熱時間等を基準とし
て適宜決定される。また周囲部分低温加熱法の一
変形として、成形部分にごく近い周囲部分のみ
を、成形部分よりも若干高温にする方法も本発明
の一態様である。また本発明方法における加熱部
の最高温部は使用材質の成形性により成形可能な
温度が選択される。一方、加熱部の最低温部は高
温部より低温であることは必要であるが、使用材
質のガラス転移点以下が好ましい。 The non-uniform heating method can be roughly divided into a peripheral part high temperature heating method and a peripheral part low temperature heating method, and the non-uniform heating adopted in the present invention is a peripheral part low temperature heating method,
In the present invention, a method is adopted in which the molded part is heated to a high temperature, the central part of the molded part to a lower temperature, and the peripheral part of the molded part to an even lower temperature. In the present invention, it is also a preferred embodiment to provide a temperature gradient in each of the molded part and the central part of the molded part. The low temperature and high temperature in these cases are relative, and are generally appropriately determined based on the softening temperature and heating time of the sheet. Further, as a variation of the low-temperature heating of the surrounding area, a method in which only the surrounding area very close to the molded part is heated to a slightly higher temperature than the molded part is also an embodiment of the present invention. Furthermore, the highest temperature part of the heating part in the method of the present invention is selected at a moldable temperature depending on the moldability of the material used. On the other hand, although it is necessary that the lowest temperature part of the heating part be lower than the high temperature part, it is preferably lower than the glass transition point of the material used.
不均一加熱を達成する手段として、本発明では
加熱補助具５を使用するが、加熱補助具５として
は以下のものが使用される。第４図の例（熱板支
持体は省略。以下同じ。）は、シート８に対する
面に欠損部６（例えば台形の凹部）を設けたもの
であつて、欠損部６のシート８に対する面と非欠
損部のシート８に対する面との間に温度差が生じ
る。第５図（上面側のみの熱板を示す。）は欠損
部６を曲線状とした例であつて、よりゆるやかな
温度差を期待しうる。第６図（上面側のみの熱板
を示す。）の例は冷却管７を内装した加熱補助具
５を示したものである。また第７図（上面側のみ
の熱板を示す。）の如く、加熱補助具５は熱板３
の一部分に取りつけてもよい。また第４図および
第７図に示す場合において、欠損部６に断熱材を
装填してもよい。これらの欠損部６の大きさ又は
断熱材の材質、断熱材の大きさは、得ようとする
不均一加熱の度合に応じて適宜選択される。本発
明における不均一加熱達成手段は、これらの例示
に限定されることはなく、これらの組合わせも可
能である。 As a means for achieving non-uniform heating, a heating aid 5 is used in the present invention, and the following are used as the heating aid 5. The example in FIG. 4 (the hot plate support is omitted; the same applies hereinafter) has a defect 6 (for example, a trapezoidal recess) on the surface facing the sheet 8, and the surface of the defect 6 facing the sheet 8 is A temperature difference occurs between the non-defective portion and the surface facing the sheet 8. FIG. 5 (showing the hot plate only on the upper surface side) is an example in which the defective portion 6 is curved, and a gentler temperature difference can be expected. The example shown in FIG. 6 (showing only the hot plate on the top side) shows a heating aid 5 having a cooling pipe 7 installed therein. In addition, as shown in FIG. 7 (showing the hot plate only on the top side), the heating aid 5 is attached to the hot plate 3.
It may be attached to a part of the Furthermore, in the cases shown in FIGS. 4 and 7, the defective portion 6 may be filled with a heat insulating material. The size of these defective portions 6, the material of the heat insulating material, and the size of the heat insulating material are appropriately selected depending on the degree of non-uniform heating to be obtained. The means for achieving non-uniform heating in the present invention is not limited to these examples, and combinations thereof are also possible.
以上のような不均一加熱達成手段を備えた加熱
補助具５は、熱板３にボルト等をもつて取り外し
自由なように装着されるものであつて、主として
熱板３からの熱をシートに好適に伝導する良伝熱
性の部材（例えばアルミニウム、鉄等）からな
る。かくしてシートは、シートに対する面が、加
熱補助具によつて部分的に熱伝導性に差を設けら
れて不均一的に加熱される。 The heating aid 5 equipped with the means for achieving non-uniform heating as described above is detachably attached to the hot plate 3 with bolts or the like, and is mainly used to transfer heat from the hot plate 3 to the sheet. It is made of a material with good heat conductivity (for example, aluminum, iron, etc.). In this way, the surface of the sheet facing the sheet is heated non-uniformly by the heating auxiliary tool, with local differences in thermal conductivity.
本発明においては加熱補助具５を熱板３に直接
装着して使用することが通常の態様であるが、必
要に応じて、若干の隙間を設けるが如く、直接装
着しないで使用する方法もその一態様である。ま
た断熱材のみを加熱補助具として熱板に直接又は
若干の隙間を設けて装着する方法も本発明の一態
様である。 In the present invention, it is normal to use the heating aid 5 by directly attaching it to the hot plate 3, but if necessary, it is also possible to use it without directly attaching it, such as by providing a slight gap. This is one aspect. Another aspect of the present invention is a method in which only the heat insulating material is used as a heating aid and is attached directly to the hot plate or with a slight gap provided therebetween.
以下、実施例を挙げて本発明をさらに詳細に説
明する。
Hereinafter, the present invention will be explained in more detail with reference to Examples.
実施例 １
内部にヒーターを内蔵した、直径165mm、厚さ
80mmの円柱状アルミニウム製熱板を、72ケ用意
し、所定間隔に配列された６ケずつを鉄製の熱板
支持体により支持した。その縦断面図は第３図
の如くであり、平面図は第３図の如くであつ
た。支持体により支持された６組の熱板（即ち６
ケ×６組で36ケ）を所定間隔に配列し、さらには
他の支持体により支持して片側の熱板（分割され
た熱板の集合体）を形成した。別に第６図の如き
形状（平面図は円形）の加熱補助具を72ケ用意
し、円中心が合致するようにして上記熱板にそれ
ぞれボルトにて装着した。加熱補助具はアルミニ
ウム製であつて直径165mm、中心部の最も厚い部
分で厚み15.5mm、端部のうすい部分で15mm（厚み
の差は0.5mm）である。厚さ2.3mmの発泡ポリスチ
レンシートに、厚さ0.14mmのハイインパクトポリ
スチレンシートを貼り合わせたシートを上下一対
の上記熱板に挟んで加熱した。ハイインパクトポ
リスチレンシートにはピツチ模様が印刷してあ
り、成形後所定の位置に模様が表れるように計画
されている。シートの加熱温度はそれぞれ最高温
部が140℃、最低温部（非加熱部）が40℃であり、
加熱時間は５秒であつた。このような不均一加熱
を行つた後、どんぶり状金型を用いて、どんぶり
状容器（底部は80mmφ、開口部は158mmφ、高さ
は80mm）を一シヨツトにつき36ケ成形した。成形
にあたつては高温部で加熱された部分が成形部分
に対応するようにした。得られたどんぶり状容器
はピツチ模様が所定の位置に正確に表れたもので
あつた。一方、均一加熱を行つた場合には発泡ポ
リスチレンシートの収縮のバラツキのために成形
品上の模様の位置にズレが生じて良品が得られ難
かつた。Example 1 Diameter 165mm, thickness with built-in heater
Seventy-two 80 mm cylindrical aluminum hot plates were prepared, and six of each were arranged at predetermined intervals and supported by iron hot plate supports. Its longitudinal sectional view was as shown in FIG. 3, and its plan view was as shown in FIG. Six sets of hot plates (i.e. six
6 sets of 36 pieces) were arranged at predetermined intervals and further supported by another support to form one side of the hot plate (an assembly of divided hot plates). Separately, 72 heating aids having the shape shown in FIG. 6 (circular in plan view) were prepared, and each was attached to the hot plate with bolts so that the centers of the circles coincided. The heating aid is made of aluminum and has a diameter of 165 mm, a thickness of 15.5 mm at the thickest part at the center, and 15 mm at the thinner part at the end (the difference in thickness is 0.5 mm). A sheet in which a 0.14 mm thick high impact polystyrene sheet was laminated to a 2.3 mm thick expanded polystyrene sheet was sandwiched between a pair of upper and lower heating plates and heated. A pitch pattern is printed on the high-impact polystyrene sheet, and the pattern is designed to appear at a predetermined position after molding. The heating temperature of the sheet is 140°C at the highest temperature and 40°C at the lowest temperature (non-heated part).
The heating time was 5 seconds. After performing such uneven heating, each shot was molded into 36 bowl-shaped containers (bottom: 80 mmφ, opening: 158 mmφ, height: 80 mm) using a bowl-shaped mold. During molding, the part heated in the high temperature section corresponded to the molded part. The resulting bowl-shaped container had a pitch pattern accurately displayed in a predetermined position. On the other hand, when uniform heating was performed, it was difficult to obtain a good product because the pattern position on the molded product was misaligned due to variations in the shrinkage of the expanded polystyrene sheet.
本発明の加熱成形方法は、相互に分離してなる
複数の分割された熱板を使用したことにより、連
続した熱板を使用した場合のような加熱面の熱の
バラツキを防止できるとともに、設備的な便利さ
が得られる。しかも成形部を高温に、成形部の中
央部をそれより低温に加熱し、且つ成形部の周囲
部分が更に低温となるようにシートを加熱し、成
形部の周囲部分がほとんど加熱されないようにす
ることにより、(i)印刷合わせ成形（又は見当合わ
せ成形ともいう）を容易ならしめることができ
る。ここに印刷合わせ成形とは、予め印刷された
模様（文字等を含む）が成形品の所定の位置に来
るようにして行われる成形である。印刷合わせ成
形を行うには、シートの送り精度、加熱時のドロ
ーダウン対応、シートの収縮率（流れ方向および
幅方向）などの厳重な規制が要求される。しか
し、例えば発泡ポリスチレンシートの場合など
は、シートの収縮率の規制はかなり困難であり、
また一回の成形における面積が大になればなるほ
どシートの中心部分と四隅部分との差は大きくな
らざるを得ない。その結果としてシート内の位置
によつて成形に良・不良の差が生じることとな
る。しかしながら本発明方法では成形部の周囲部
分は実質的に非加熱であるからシート全体として
の収縮がおこることがなく成形部分のみ加熱され
て好適に成形することができる。さらに、(ii)二種
以上のシート、例えば発泡ポリスチレンシートに
ポリエチレンシートを貼合した複合シートの場合
には、スクラツプを原料に戻すことはできないた
め、そのスクラツプは低評価に甘んじなければな
らない。またこのような複合シートをそれぞれの
材料にひき離す（ひきはがす）ことは決して容易
ではない。しかし本発明の如き不均一加熱を行う
ことにより、スクラツプ部分はひき離し（ひきは
がし）が容易となり、それぞれの材料を原料とし
て回収することを可能とする。特に異種素材を貼
合わせたシートによる印刷合わせ成形において、
周囲部分を未印刷状態とした場合には、ひき離し
により、そのスクラツプ価値は非常に高められ
る。
By using a plurality of divided hot plates that are separated from each other, the hot forming method of the present invention can prevent the unevenness of heat on the heating surface that would occur when using continuous hot plates, and can also You can get convenience. In addition, the sheet is heated so that the forming part is heated to a high temperature, the central part of the forming part is heated to a lower temperature, and the surrounding area of the forming part is heated even further, so that the surrounding area of the forming part is hardly heated. By doing so, (i) printing alignment molding (also referred to as registration molding) can be facilitated. Here, printing alignment molding is a molding process in which a pre-printed pattern (including characters, etc.) is placed at a predetermined position on a molded product. Printing and molding requires strict regulations such as sheet feeding accuracy, drawdown support during heating, and sheet shrinkage rate (in the flow direction and width direction). However, in the case of expanded polystyrene sheets, for example, it is quite difficult to control the shrinkage rate of the sheet.
Furthermore, the larger the area in one molding, the larger the difference between the center portion and the four corner portions of the sheet. As a result, there is a difference between good and bad molding depending on the position within the sheet. However, in the method of the present invention, since the surrounding area of the molding part is not substantially heated, the sheet as a whole does not shrink, and only the molding part is heated, allowing suitable molding. Furthermore, in the case of (ii) a composite sheet made by laminating two or more types of sheets, such as a foamed polystyrene sheet and a polyethylene sheet, the scrap cannot be returned to the raw material, so the scrap must be content with a low evaluation. Moreover, it is by no means easy to separate (peel off) such a composite sheet into its respective materials. However, by performing non-uniform heating as in the present invention, the scrap portion can be easily separated, making it possible to recover each material as a raw material. Especially in printing lamination molding using sheets laminated with different materials,
When the surrounding area is left unprinted, the scrap value is greatly increased by separation.
更に本発明では熱板に加熱補助具を設けてシー
トと接する面に部分的に熱伝導性の差を設け、成
形部を高温に、成形部の中央部をそれより低温に
加熱するため、成形体の底部の肉厚が必要以上に
薄くなるのを防止できる。 Furthermore, in the present invention, a heating aid is provided on the hot plate to create a partial difference in thermal conductivity on the surface in contact with the sheet, so that the forming part is heated to a high temperature and the central part of the forming part is heated to a lower temperature. It is possible to prevent the thickness of the bottom part of the body from becoming thinner than necessary.
このような不均一加熱を熱板のみによつて実施
するには、必要とする不均一加熱を達成できるよ
う熱板自体を加工することが必要であるが、熱板
はきわめて高価なものであるから、個々の成形体
に応じて熱板を加工することは決して実用的では
ない。また熱板本体は重量的にもきわめて大であ
り、その交換、取りつけも決して容易ではない。
しかし本発明では加熱補助具により不均一加熱を
実現しているから熱板本体を交換する必要はな
く、加熱補助具はより軽く、薄い部材で形成され
うるから交換が容易であるとともに、種々の加熱
補助具を用意しても、個々の成形体に応じた熱板
を用意する場合に比べてはるかに安価で済む等の
種々の効果を有する。 To achieve such non-uniform heating using only a hot plate, it is necessary to process the hot plate itself to achieve the desired non-uniform heating, but hot plates are extremely expensive. Therefore, it is never practical to process hot plates according to individual molded bodies. In addition, the heating plate itself is extremely large in weight, and its replacement and installation are by no means easy.
However, in the present invention, since non-uniform heating is achieved by the heating aid, there is no need to replace the hot plate itself, and the heating aid can be made of a lighter and thinner member, making it easier to replace. Even if a heating aid is prepared, it has various effects such as being much cheaper than preparing a heating plate for each individual molded object.
第１図は従来の熱板により均一加熱を行う状態
を示す平面図、第２図は本発明方法に用いられ
る、相互に分離してなる複数の分割した熱板によ
り不均一加熱を行う状態を示し、同図，はそ
れぞれ熱板形状の異なる態様を示す平面図、第３
図，は本発明に用いられる熱板を支持体によ
つて支持した状態を示す要部縦断面図および要部
平面図、第４図〜第７図は本発明に用いられる熱
板にそれぞれ異なる加熱補助具を使用して加熱を
行う状態を示す縦断面図である。
３……熱板、５……加熱補助具、８……熱可塑
性合成樹脂シート。
Fig. 1 is a plan view showing a state in which uniform heating is performed using a conventional heating plate, and Fig. 2 is a plan view showing a state in which uneven heating is performed using a plurality of divided heating plates separated from each other, which is used in the method of the present invention. 3 and 3 are plan views showing different aspects of the hot plate shape, respectively.
Figures 4 and 7 are longitudinal sectional views and plan views of essential parts showing the hot plate used in the present invention supported by a support body, and Figures 4 to 7 show different parts of the hot plate used in the present invention, respectively. FIG. 3 is a longitudinal cross-sectional view showing a state in which heating is performed using a heating aid. 3... Hot plate, 5... Heating aid, 8... Thermoplastic synthetic resin sheet.
Claims (1)
トからなるシートを熱板にて両面から加熱し、そ
の後成形する方法であつて、相互に分離して形成
され、且つシートに対する面に加熱補助具を設け
てシートに対する面に部分的に熱伝導性の差を設
けてなる複数の分割された熱板により、シートを
相対的に主として成形部を高温に、成形部の中央
部をそれよりも低温に、且つ成形部の周囲部分が
更に低温となるように加熱することを特徴とする
熱可塑性合成樹脂シートの加熱成形方法。1 A method in which a sheet consisting of at least one layer of thermoplastic synthetic resin foam sheet is heated from both sides with a hot plate, and then molded, the sheets are formed separately from each other, and a heating aid is provided on the side facing the sheet. By using a plurality of divided heating plates each having a partial difference in thermal conductivity on the surface facing the sheet, the sheet is relatively heated mainly at a high temperature in the molding area, and at a lower temperature in the center of the molding area. A method for thermoforming a thermoplastic synthetic resin sheet, which further comprises heating the surrounding area of the molded part to a lower temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11254983A JPS604023A (en) | 1983-06-22 | 1983-06-22 | Thermoforming process of thermoplastic synthetic resin sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11254983A JPS604023A (en) | 1983-06-22 | 1983-06-22 | Thermoforming process of thermoplastic synthetic resin sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS604023A JPS604023A (en) | 1985-01-10 |
| JPS639969B2 true JPS639969B2 (en) | 1988-03-03 |
Family
ID=14589435
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11254983A Granted JPS604023A (en) | 1983-06-22 | 1983-06-22 | Thermoforming process of thermoplastic synthetic resin sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS604023A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04131379U (en) * | 1991-05-24 | 1992-12-02 | 大黒工業株式会社 | wall fasteners |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19737503B4 (en) * | 1997-08-28 | 2007-09-20 | Robert Bosch Gmbh | Thermoforming machine |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5898218A (en) * | 1981-12-08 | 1983-06-11 | Oomori Kikai Kogyo Kk | Heat forming method of film |
| JPS59199206A (en) * | 1983-04-27 | 1984-11-12 | Sekisui Plastics Co Ltd | Method and apparatus for heating thermoplastic resin sheet |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5860414U (en) * | 1981-10-20 | 1983-04-23 | 出光石油化学株式会社 | Thermoforming sheet direct heating device |
-
1983
- 1983-06-22 JP JP11254983A patent/JPS604023A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5898218A (en) * | 1981-12-08 | 1983-06-11 | Oomori Kikai Kogyo Kk | Heat forming method of film |
| JPS59199206A (en) * | 1983-04-27 | 1984-11-12 | Sekisui Plastics Co Ltd | Method and apparatus for heating thermoplastic resin sheet |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04131379U (en) * | 1991-05-24 | 1992-12-02 | 大黒工業株式会社 | wall fasteners |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS604023A (en) | 1985-01-10 |
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