JPH0155984B2 - - Google Patents
Info
- Publication number
- JPH0155984B2 JPH0155984B2 JP60068340A JP6834085A JPH0155984B2 JP H0155984 B2 JPH0155984 B2 JP H0155984B2 JP 60068340 A JP60068340 A JP 60068340A JP 6834085 A JP6834085 A JP 6834085A JP H0155984 B2 JPH0155984 B2 JP H0155984B2
- Authority
- JP
- Japan
- Prior art keywords
- heating
- sheet
- molding
- heating plate
- molded product
- 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 113
- 239000006260 foam Substances 0.000 claims description 55
- 238000000465 moulding Methods 0.000 claims description 45
- 238000000034 method Methods 0.000 claims description 23
- 230000006835 compression Effects 0.000 claims description 7
- 238000007906 compression Methods 0.000 claims description 7
- 238000005192 partition Methods 0.000 claims description 4
- 230000001629 suppression Effects 0.000 claims description 4
- 239000011810 insulating material Substances 0.000 claims description 2
- 238000000638 solvent extraction Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 description 6
- 230000007246 mechanism Effects 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 4
- 229920005992 thermoplastic resin Polymers 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229920006248 expandable polystyrene Polymers 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007652 sheet-forming process 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
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】
＜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、成形型に沿つて膨出変形させて、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つて、
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。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。<Prior art> In the sheet forming process described above, the foam sheet is heated by bringing a heating plate into contact with both sides of the foam sheet and by direct heat transfer from the heating plate.
There is a method of heating a foam sheet, for example, as disclosed in Japanese Patent Application Laid-Open No. 110224/1983. 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つて、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た成形品
を構成しない部分全体に形成してある。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部への樹脂の
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つて、極めて重要なもの
である。 Among these, as a low temperature part, by forming a cylindrical recess in the heating plate, a circular low temperature part is formed at a position corresponding to the molded product of the foam sheet, and as a high temperature part. Of the foam sheets,
It is formed around the entire part of the molded product that is finally trimmed and does not constitute the molded product. and,
The effect of forming such a high-temperature zone is that during molding, resin is supplied from the highly fluid high-temperature zone to the center of the molded product, which stabilizes the wall thickness of the entire molded product and enables smooth molding. It is said that 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
がズレたり変形しないようにして、成形する必要
がある。 Furthermore, when using pre-printed foam sheets, make sure that the foam sheet does not shift or deform so that the printed pattern or color scheme is placed in the correct position on the molded product. There is a need to.
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
もを大きくすると、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越したり、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つた。さらに、上記高温
部の形成によつて、発泡シート全体の形状維持性
が悪くなつて、反つたり弛ぼだりし易くなり、加
熱工程から成形工程への発泡シートの移送が行い
難く、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, when a high-temperature area is formed on the entire outer periphery of a molded product and the retraction toward the center of the molded product is increased, the foam sheets in the peripheral portions of adjacent molded products are strongly attracted to each other. This causes problems such as interference with each other, resulting in defective molding and locally uneven wall thickness. In addition, the high-temperature area formed around the entire periphery of the molded product is extremely susceptible to deformation and movement, so the position of the printing applied in advance on the foam sheet is likely to shift or shift, resulting in many printing misalignments on the molded product. There was a drawback. 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 sag, making it difficult to transfer the foamed sheet from the heating process to the molding process, and making it difficult to transfer the foamed sheet from the heating process to the molding process. There also arises a problem that it becomes difficult to hold the foam sheet 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つて、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 improve the performance of foam sheets when molding a plurality of molded products. We have developed a method that eliminates pull-in and interference, enables fixed-position molding, eliminates printing position shift, and facilitates handling of the foam sheet after heating.
＜構 成＞
そして、上記目的を達成するための方法として
は、シート成形に使用す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
分を形成するとともに上記発泡シートの加熱抑制
部分の内側の各成形部分のうち、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、上記引き込まれる部分の圧縮加熱軟化
度を、中央側部分の圧縮加熱軟化度よりも大きく
なるようにすることを特徴としている。<Structure> And, as a method for achieving the above object, in order to heat and soften the foam sheet used for sheet molding, a heating plate is brought into contact with both sides of the foam sheet to heat and compress the foam sheet. A concave portion having a shape that separates a plurality of molded portions from each other is formed on the contact surface of the heating plate to suppress heat transfer to the foam sheet at such locations, and to partition each molded portion of the foam sheet from each other. A heating plate contact surface corresponding to a portion of each molded portion inside the heat suppressing portion of the foam sheet that is drawn from the periphery of the molded product into the center of the molded product during molding. , the contact surface of the heating plate corresponding to the center side of the molded product is recessed, and the compression heat softening degree of the drawn-in portion of the foam sheet is made larger than the compression heat softening degree of the center side portion. It is characterized by making it happen.
＜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
プ機構を備えたチエーンコンベア等の、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、順次発泡シート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として丼状の
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, where 1 is a heating section and 2 is a molding section. Between the heating section 1 and the forming section 2, there is provided means for transporting the foam sheet S, such as a chain conveyor equipped with a clamp mechanism. Then, a long foamed sheet S made of a thermoplastic resin such as a foamed polystyrene sheet is configured to be continuously fed from the heating section 1 to the molding section 2, and the foamed sheets S
After being heated and softened, a predetermined molding process is performed. In the illustrated embodiment, a case is illustrated in which a plurality of bowl-shaped 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
１０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つて、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
伝導によつて加熱軟化させると同時に、加熱板１
０，１０を発泡シートＳに押圧すことによつて圧
縮すようになつている。 The heating section 1 includes a pair of upper and lower heating plates 10, 10 made of a material with good thermal conductivity such as aluminum alloy.
Behind the heating plates 10, 10 are equipped with heat generating mechanisms 11, 11 for heating and raising the temperature. It is installed so that it can be raised and lowered freely. Then, the heating plates 10, 10 are brought into contact with the upper and lower surfaces of the foam sheet S, and at the same time, the heating plates 10, 10 are heated and softened by direct heat conduction.
0,10 is compressed by pressing it against the foam sheet S.
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
成してあると共に、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つて、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
して先端面に連なつている。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てある。この格子状凹部１
３の深さは、前記した浅い円形状凹部１２よりも
かなり深く、発泡シートＳに加熱板１０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 detailed structure of the heating plate 10 is shown in FIGS.
As shown in the figure. That is, the contact surfaces of the upper and lower heating plates 10 against the foamed sheet S are entirely formed into a horizontal plate shape, and have shallow recesses 12 and deep recesses 13 formed in some parts. The shallow recess 12 is formed in a circular shape at a position of the foamed sheet S that contacts the central part of the molded product when molded, and is slightly smaller than the tip end surface of the heating plate 10. It is concave, and the outer periphery slopes gently and connects to the tip surface. The deep recesses 13 are formed in the shape of vertical and horizontal lattice grooves at positions in 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. This lattice-shaped recess 1
3 is considerably deeper than the shallow circular recesses 12 described above, and even if the foam sheet S expands in the thickness direction when the heating plate 10 is brought into contact with the foam sheet S and compressed by heating, the lattice-shaped recesses The foamed sheet S is formed deep inside 13 to the extent that it does not come into contact with it.
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, a method of heating the foam sheet S using the heating plate 10 having the above structure will be explained.
発泡シートＳの両面に加熱板１０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
することによつて、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、全体が完全に平担な
ものではなく、円形状凹部１２や格子状凹部１３
が形成してあるので、発泡シートＳの部分によつ
て、加熱状態が違つてくる。 Similar to the conventional heating plate 10, the heating plate 10 is pressed against both sides of the foamed sheet S to soften it by heating and simultaneously compress it in the thickness direction. and,
By appropriately setting the heating time or the pressing force of the heating plate 10, the degree of heat softening of the entire foamed sheet S can be adjusted. However, the contact surface of the heating plate 10 with the foam sheet S is not completely flat as a whole, but has circular recesses 12 and lattice recesses 13.
is formed, the heating state differs depending on the portion of the foam sheet S.
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
１０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つ
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。従つて、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 surfaces of this foamed sheet S are brought into contact with heating plates 10, 10 and heated. Then, in a portion a of the foam sheet S where the tip end surface of the heating plate 10 contacts, the heating plate 10
By completely contacting each other and pressing strongly, the foamed sheet S is sufficiently heated and heated, and the foamed sheet S is completely softened and at the same time is greatly compressed in the thickness direction. Therefore, the thickness of the part T1
becomes 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 foamed sheet S that is in contact with the shallow circular recess 12 of the heating plate 10, the foamed sheet S is compressed relatively weakly compared to the portion a, and the heat softening rate is is also smaller than 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。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、従つて加熱板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。 Furthermore, in the portion c of the foamed 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 foamed sheet S at all, and heating is suppressed, so that the portion c is almost heated and softened. Because it is never compressed or compressed,
The thickness of the foamed sheet S remains the same as the original thickness T. Note that in the heating plate 10 shown in FIG. 3, the recess 13 is not formed on the entire outer peripheral edge, but in the heated foam sheet S, the heating plate 10 naturally A heating suppressing portion c similar to that described above is also formed at a position that does not contact the heating plate 10 and therefore corresponds to the outer peripheral edge of the entire heating plate 10. That is, the plurality of molded parts are partitioned by the heat-suppressing parts c, and the outer periphery of each molded part is surrounded by the heat-suppressing parts 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
２に送込んで、所定の成形加工を施すことにな
る。 In the above state, the foamed sheet S, in which portions a to c having partially different degrees of heat softening are formed, is fed into the molding section 2 and subjected to a predetermined molding process.
成形部２の構造について説明すと、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つて、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
つて膨出変形させて、成形品Ｆを成形製造するも
のである。上記金型２０，２１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. , 21 is sandwiched between the heated and softened foam sheet S, and is expanded and deformed along the shape of the molds 20 and 21 to produce a molded product F. The structure of the molds 20, 21 and the entire molding section 2 can be implemented using the same conventional molding mechanisms for vacuum forming, pressure forming, and other various 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、ほとんど加熱軟化させていない部分ｃ
は、ほとんど変形せず、成形品Ｆの周辺で、成形
には全く使用されないスクラツプ部分になる。従
つて、成形品Ｆ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によつて成
形されことになる。 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 way as in the conventional molding method, as described above. becomes the central part of Next, the portion b with a high degree of heat softening is the molded product F.
The area around the area is greatly elongated and deformed, and becomes a retractable part that is pulled toward the center. Also, the part c 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 F that is not used for molding at all. Therefore, the molded product F is formed by the medium heating portion b and the high heating portion a of the foamed sheet S.
以上に述べた加熱抑制部分の加熱方法のうち、
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
横の格子状のもののほか、適宜変更して実施でき
る。 Among the methods of heating the heating suppressed part described above,
The heating plate 10 for heating the foamed sheet S is provided with deep recesses 13 at positions that separate the molded products F from each other, depending on the shape and arrangement of the plurality of molded products F to be formed side by side on the foamed sheet S. The shape of the recessed portion 13 may be modified as appropriate in addition to the vertical and horizontal lattice shape shown in the figure.
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の凹部１３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 suppression portion c, the fifth
As shown in the figure, if a heat-resistant heat insulating material 14 is buried deep inside the recess 13 of the heating plate 10,
Heat transfer from the heating plate 10 to the foamed sheet S can be more reliably suppressed, and a heat-suppressed portion c that has a lower degree of heat softening and is less likely to deform 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, although the illustrated irregularities of the heating plates 10 are formed in exactly the same shape on the upper and lower sides of the foam sheet S, the irregularities may be different between the upper and lower heating plates 10, or only one heating plate 10 may have irregularities. A shape may be formed in advance.
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。 Further, as the heat generation mechanism 11 for heating and raising the temperature of the heating plate 10, there are various types of heat generation mechanism 11, such as one equipped with an electric heater, one configured to be able to introduce a heating medium such as steam, etc., similar to the conventional heating structure. It is possible to implement it with the structure of
次に、上述の実施例では、発泡シートＳに対し
て、加熱板１０を両面から押き当てて、加熱軟化
と同時に圧縮しているが、この圧縮によつて、発
泡シートＳを加熱軟化させたときに生じる、厚み
方向の発泡膨脹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が反つたり弛んだりする
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-mentioned embodiment, the heating plate 10 is pressed against the foam sheet S from both sides to compress the foam sheet S at the same time as heating and softening it. It is possible to suppress foam expansion in the thickness direction and contraction in the plane direction that occur when the foam is heated. Then, the thickness of the foam sheet S is
The thickness can be arbitrarily adjusted to a certain value or less suitable for molding, and the foamed sheet S can be prevented from warping or loosening, and can also be prevented from deforming or moving in the plane direction. It also has the effect of smoothing both sides of the foam sheet S. Note 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イルムが積層されたも
のでも実施可能であ。さらに、発泡シートＳの表
面に、適宜印刷模様形成された、印刷シートを使
用するのが好適である。 As the foamed sheet S to be heated by the heating method of the present invention, foamed sheets S made of polyethylene, polypropylene, and other various thermoplastic resins in addition to polystyrene can be used. It is also possible to use a non-foamed sheet or a laminated film made of thermoplastic resin. 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
た丼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 bowl-shaped 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を加熱軟化させことに
よつて、発泡シートＳのうち、各成形品Ｆを区画
す位置に、他部分に比べてほとんど加熱軟化され
ない、凹部１３に対応す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, recesses 13 are formed in the foamed sheet S used for sheet molding, each having a shape that separates the parts F of the plurality of molded products from each other. By heating and softening the foamed sheet S with the heated plate 10 in contact with it, recesses are formed in the foamed sheet S at positions that partition each molded product F, which are hardly softened by heating compared to other parts. A heating suppressing portion c having a shape corresponding to 13 is formed.
そして、ほ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つて、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。 The heat-suppressing portion c, which is hardly softened by heating and hardly deformed, is formed at the outer periphery of the plurality of molded products F at a position that partitions each molded product F, so that the deformation and position of the foam sheet S Misalignment can be effectively prevented, position molding can be performed, and printing misalignment can be prevented. Furthermore, since deformation of the entire foamed sheet S can be prevented, handling of the heated and softened foamed sheet S is easy, and the molding molds 20, 21
It can also be placed 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
に境界を越えて、発泡シートＳ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。また、加熱抑制部分ｃの内側の各成形部分の
うち、成形品中央側に対応する加熱板の当接面
を、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、
凹ませて形成し、発泡シートのうち、上記引き込
まれる部分の圧縮加熱軟化度を、中央側部分の圧
縮加熱軟化度よりも大きくなるようにするものゆ
え、成形品中央側に引き込まれる部分を非常に柔
軟で変形し易い高加熱部分ａとでき、成形時の引
込み量を増大させることができるのみならず、変
形し難い加熱抑制部分ｃにて発泡シート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。 Furthermore, in a molding process in which a plurality of molded products F are simultaneously molded side by side, it is possible to reliably prevent the foam sheets S from being drawn in or interfering with each other beyond the boundaries of adjacent molded product F portions, and to The effect of preventing molding and printing misalignment can also be more effectively demonstrated. In addition, among the molded parts inside the heat suppression part c, the contact surface of the heating plate corresponding to the center side of the molded product is changed from the contact surface of the heating plate corresponding to the part that is drawn from the periphery of the molded product to the center side of the molded product during molding. than the contact surface,
Because it is formed in a concave manner so that the degree of compression and heating softening of the portion of the foamed sheet that is drawn in is greater than the degree of compression and heating softening of the central portion, the portion that is drawn toward the center of the molded product is It is possible to not only increase the amount of retraction during molding, but also prevent deformation of the entire foam sheet S and prevent the deformation of the entire foam sheet S with the hard-to-deform heat suppressing portion c This can provide extremely significant effects such as preventing attraction and interference in the F section.
＜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つた。<Specific Example> In order to demonstrate the effects of the present invention described above, the heating plate 10 was specifically used to heat and mold the 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、丼状のカツプ容器を成形す
る。 As the foamed sheet S, a foamed polystyrene sheet with a thickness T = 2.5 mm was used, and as the molded product F,
A bowl-shaped cup container as shown in FIG. 4 is formed.
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＝160mmで
深さ0.3mmに形成し、格子状凹部１３は幅Ｗ＝５
mmで深さ５mmに形成してあり、複数の成形品間の
ピツチＰ＝165mmに形成してある。 The structure of the heating plate 10 is shown in FIGS. 2 and 3.
In the figure, the circular recess 12 is formed with a diameter D = 160 mm and a depth of 0.3 mm, and the lattice recess 13 has a width W = 5 mm.
The molded parts are formed to have a depth of 5 mm and a pitch P of 165 mm between the plurality of molded products.
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つて、発泡シートＳは
中加熱部分ｂの厚みＴ２が１mm、高加熱部分ａの
厚みＴ１が0.7mmに圧縮され、加熱抑制部分ｃで
は、原反の厚み2.5mmのままであつた。 Then, by heating and softening the foam sheet S at a surface temperature of 150° C. for 2 seconds, the foam sheet S is compressed to a thickness T2 of 1 mm in the medium heating portion b and a thickness T1 of 0.7 mm in the high heating portion a. In the heat-suppressed portion c, the thickness of the original fabric remained at 2.5 mm.
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２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 sheets S having partially different degrees of heat softening were molded in the molding section 2 for sheet molding, a molded product F with good thickness and shape and excellent quality was molded. . Furthermore, a molded product F with no printing deviation and an extremely good appearance was obtained.
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…
…高加熱部分、ｂ……中加熱部分、ｃ……加熱抑
制部分、Ｆ……成形品。
The figure shows an embodiment of the invention.
The figure is a schematic structural diagram of the entire molding device, Figure 2 is a detailed cross-sectional view of the heating plate, Figure 3 is a plan view of the heating plate, Figure 4 is a half-sectional view of the molded product, and Figure 5 is a detailed cross-sectional view of the heating plate. It is a sectional view of a modification example. 1... Heating section, 10... Heating plate, 12, 13...
...Concave part, 2...Molding part, S...Foam sheet, a...
... Highly heated part, b... Medium heated part, c... Heating suppressed part, F... Molded product.
Claims (1)
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
部分を形成するとともに上記発泡シートの加熱抑
制部分の内側の各成形部分のうち、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、上記引き込まれる部分の圧縮加熱軟
化度を、中央側部分の圧縮加熱軟化度よりも大き
くなるように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 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. In a method of heating and compressing a foamed sheet by bringing heating plates into contact with both sides of the foamed sheet in order to heat and soften the foamed sheet used for sheet molding, a plurality of molded parts of the foamed sheet are A concave portion having a partitioning shape is formed on the contact surface of the heating plate to suppress heat transfer to the foam sheet at that location, and a heat suppression portion is formed at a position of the foam sheet that partitions each molded portion from each other. Also, among the molded parts inside the heat suppression part of the foam sheet, the contact surface of the heating plate corresponds to the part that is drawn into the center of the molded product from the periphery of the molded product during molding, and corresponds to the center side of the molded product. A sheet characterized in that the contact surface of the heating plate is formed by recessing, and the degree of compression and heating softening of the drawn-in portion of the foamed sheet is greater than the degree of compression and heating softening of the center side portion. Method of heating foam sheets during molding. 2. Claim 1 above, in which a heat insulating material is buried inside a recess for forming a heating suppressing portion formed in a heating plate to suppress heat transfer to the foam sheet.
Method for heating a foamed sheet in sheet molding as described in Section 3.
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 JPS61225024A (en) | 1986-10-06 |
| JPH0155984B2 true 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) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5098633A (en) * | 1990-03-19 | 1992-03-24 | Illinois Tool Works Inc. | Backlit button by thermoformed cap process |
| DE19737503B4 (en) * | 1997-08-28 | 2007-09-20 | Robert Bosch Gmbh | Thermoforming machine |
| FR2827210B1 (en) * | 2001-07-13 | 2006-11-24 | Erca Formseal | PROCESS AND INSTALLATION FOR THERMOFORMING CONTAINERS LIMITING LOSS OF MATERIAL |
Citations (2)
| 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 |
-
1985
- 1985-03-29 JP JP6834085A patent/JPS61225024A/en active Granted
Patent Citations (2)
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61225024A (en) | 1986-10-06 |
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