JP2935066B2 - Hot plate molding method for food container lid - Google Patents

Hot plate molding method for food container lid

Info

Publication number
JP2935066B2
JP2935066B2 JP9509123A JP50912397A JP2935066B2 JP 2935066 B2 JP2935066 B2 JP 2935066B2 JP 9509123 A JP9509123 A JP 9509123A JP 50912397 A JP50912397 A JP 50912397A JP 2935066 B2 JP2935066 B2 JP 2935066B2
Authority
JP
Japan
Prior art keywords
hot plate
lid
synthetic resin
resin film
thickness
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 - Lifetime
Application number
JP9509123A
Other languages
Japanese (ja)
Inventor
利昭 下野
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.)
ATENA KOGYO KK
Original Assignee
ATENA KOGYO KK
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 ATENA KOGYO KK filed Critical ATENA KOGYO KK
Application granted granted Critical
Publication of JP2935066B2 publication Critical patent/JP2935066B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
    • 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
    • B29C51/10—Forming by pressure difference, e.g. vacuum
    • 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
    • B29C2791/00—Shaping characteristics in general
    • B29C2791/004—Shaping under special conditions
    • B29C2791/007—Using fluid under pressure

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Packages (AREA)
  • Package Specialized In Special Use (AREA)

Description

【発明の詳細な説明】 技術分野 本発明は、食品容器蓋体の熱板成形方法、詳しくは発
泡樹脂シートと合成樹脂フィルムとを積層した積層シー
トを蓋体に熱板成形する方法に関する。Description: TECHNICAL FIELD The present invention relates to a hot plate forming method for a food container lid, and more particularly to a method for hot plate forming a laminated sheet in which a foamed resin sheet and a synthetic resin film are laminated on the lid.

背景技術 注湯することにより調理する即席麺などの即席食品の
容器は、食品を収容する容器本体とその容器本体の開口
を塞ぐ蓋体とよりなる。このような即席食品の容器に発
泡樹脂を用いると、発泡樹脂に特有の断熱性により、注
湯後排湯までの保温性が良好に保たれるので適切な調理
温度が維持されやすく、また、蓋体と容器本体とを手で
握って排湯するときに手がそれほど熱くならないので火
傷を負うおそれがなくなるという利点がある。そのた
め、即席食品の容器本体のほか、蓋体をも発泡樹脂で作
ることが試みられている（実開昭63−182120号公報）。BACKGROUND ART A container for ready-to-eat food such as instant noodles cooked by pouring is composed of a container body for containing food and a lid for closing an opening of the container body. When a foamed resin is used for such an instant food container, the proper heat-retaining property from the pouring to the discharge of hot water can be maintained satisfactorily because of the heat insulation characteristic of the foamed resin. When draining hot water while holding the lid and the container body by hand, there is an advantage that the hand does not become so hot and there is no risk of getting burned. For this reason, attempts have been made to make not only the container body of the instant food but also the lid body with a foamed resin (Japanese Utility Model Laid-Open No. 63-182120).

発泡樹脂シートに合成樹脂フィルムを積層一体化した
積層シートを、上記蓋体のような凹凸を持つ成形品に成
形するための一般的な成形方法として真空圧空成形法が
ある。As a general molding method for molding a laminated sheet in which a synthetic resin film is laminated and integrated on a foamed resin sheet into a molded article having irregularities such as the lid, there is a vacuum pressure molding method.

しかしながら、真空圧空成形法は、成形ゾーンに入る
前に積層シートを予め成形が可能な温度に加熱して軟化
させるための軟化ゾーンがあり、その軟化ゾーンで軟化
した積層シートが自重で垂れ下がったり屈曲したりする
ことがある。そして、そのように軟化した積層シートが
一定の送り量で成形ゾーンに送り込まれる。そのため、
積層シートが成形ゾーンに入る前に屈曲して積層シート
が成形ゾーンの所定位置に送り込まれないことが起こり
得る。つまり、積層シートの合成樹脂フィルムに印刷表
示が施されている場合に、その印刷表示の中心が成形ゾ
ーンの型の中心に送り込まれなくなることがあり、その
ような事態が生じたまま積層シートを食品容器の蓋体に
成形すると、最終成形品である蓋体において、その内容
物や調理方法などについての印刷表示箇所が正規の位置
からずれてしまうことが知見された。However, the vacuum pressure forming method has a softening zone for heating the laminated sheet to a temperature at which molding is possible before entering the forming zone to soften the laminated sheet, and the laminated sheet softened in the softening zone hangs down or bends under its own weight. Or you may. Then, the softened laminated sheet is fed into the forming zone at a constant feed amount. for that reason,
It can happen that the laminated sheet bends before entering the forming zone and the laminated sheet is not fed into position in the forming zone. In other words, when a printed indication is given to the synthetic resin film of the laminated sheet, the center of the printed indication may not be sent to the center of the mold in the molding zone. It has been found that, when molded into a lid of a food container, the printed and displayed portion of the lid, which is the final molded product, about its contents, cooking method, and the like is shifted from a regular position.

このような状況のもとで、本願発明者は種々研究を重
ねた結果、発泡樹脂シートと合成樹脂フィルムとでなる
積層シートを熱板成形方法を用いて成形すれば、食品容
器の蓋体のような凹凸のある成形品を成形しても、最終
成形品である蓋体の正規位置に合成樹脂フィルムに施さ
れた印刷表示が正確に一致するという事実を突き止め
た。そして、その上で、上記積層シートからの最終成形
品である食品容器の蓋体の細部の成形を、それに要求さ
れる程度にきめ細かくシャープに高精度で熱板成形する
ことができ、しかも量産のできる条件を鋭意研究した結
果、本発明を完成するに至った。Under these circumstances, the inventors of the present application have conducted various studies, and as a result, if a laminated sheet made of a foamed resin sheet and a synthetic resin film is molded using a hot plate molding method, the lid of the food container can be formed. Even when a molded article having such irregularities is molded, the fact that the printed display on the synthetic resin film exactly matches the regular position of the lid, which is the final molded article, has been found out. And, on top of that, it is possible to form the details of the lid of the food container, which is the final molded product from the laminated sheet, into a hot plate with a high degree of precision, sharply and precisely as required, and mass production. As a result of diligent research into possible conditions, the present invention has been completed.

すなわち、本発明は、注湯調理中の保温性に優れしか
も排湯時に火傷を負う危険のないように食品容器の蓋体
を発泡樹脂で作ることを基本とし、その場合に、発泡樹
脂に積層一体化される合成樹脂フィルムの印刷表示が正
規の位置からずれないようにすると共に、蓋体に要求さ
れる容器本体との嵌合性などを十分に満足させ得るよう
な細部についてのきめ細かなシャープな高精度の成形が
可能で、しかも量産できる食品容器蓋体の熱板成形方法
を提供することを目的とする。That is, the present invention is based on the fact that the lid of the food container is made of a foamed resin so as to be excellent in heat retention during pouring cooking and not to be burned when draining the hot water. Precise and detailed sharpness of the details so that the printed indication of the synthetic resin film to be integrated does not deviate from the normal position and that the fitting required for the lid with the container body can be sufficiently satisfied. It is an object of the present invention to provide a hot plate forming method for a food container lid which can be formed with high precision and can be mass-produced.

発明の開示 本発明に係る食品容器蓋体の熱板成形方法は、発泡樹
脂シートに合成樹脂フィルムを積層一体化した積層シー
トを熱板成形することによって最終成形品である蓋体を
得るものであるから、合成樹脂フィルムに施された印刷
表示が正規の位置に位置ずれなく配置される。また、こ
の熱板成形の際に使用する発泡樹脂シートは、その厚さ
を0.3〜0.95mmにする必要がある。発泡樹脂シートの好
ましい厚さは、0.3〜0.9mmであり、さらに好ましい厚さ
は0.5〜0.9mmであり、最も好ましい厚さは0.65〜0.85mm
である。発泡樹脂シートが0.95mmより厚いと熱板成形の
際に熱伝達が悪くて発泡樹脂シートをなかなか精度よく
成形できず、しかも成形速度を量産化レベル（熱板成形
時間:1個当りおよそ10秒）まで速めることもできず、さ
らには合成樹脂フィルムの方が加熱されすぎて損じる事
態を招く。0.3mmより薄いと、最終成形品である蓋体に
満足のいく断熱性が得られなくなる。DISCLOSURE OF THE INVENTION The hot plate molding method for a food container lid according to the present invention is to obtain a lid which is a final molded product by hot plate molding a laminated sheet obtained by laminating and integrating a synthetic resin film on a foamed resin sheet. Therefore, the printed display provided on the synthetic resin film is arranged at a regular position without displacement. Further, the thickness of the foamed resin sheet used in the hot plate molding must be 0.3 to 0.95 mm. The preferred thickness of the foamed resin sheet is 0.3 to 0.9 mm, the more preferred thickness is 0.5 to 0.9 mm, and the most preferred thickness is 0.65 to 0.85 mm
It is. If the foamed resin sheet is thicker than 0.95 mm, the heat transfer is poor during hot plate molding, making it difficult to mold the foamed resin sheet with high accuracy. In addition, the molding speed can be mass-produced (hot plate molding time: about 10 seconds per piece) ), And the synthetic resin film may be overheated and damaged. If the thickness is less than 0.3 mm, a satisfactory heat insulating property cannot be obtained in the lid which is the final molded product.

合成樹脂フィルムはその厚さが15〜18μｍのものを使
用する必要がある。合成樹脂フィルムの好ましい厚さは
30〜70μｍである。合成樹脂フィルムは最終成形品であ
る蓋体に印刷表示を付することに役立つほか、その蓋体
を形成している発泡樹脂シートの強度を補って割れなど
を抑制することにも役立つ。合成樹脂フィルムの厚さが
80μｍより厚いと量産レベルではコスト高になる。15μ
ｍより薄いと、合成樹脂フィルムに要求される強度が不
足し、また、熱板成形時の熱により合成樹脂フィルム自
体が損傷するおそれがある。合成樹脂フィルムの厚さが
30〜70μｍであると上記作用が特に顕著に発揮される。It is necessary to use a synthetic resin film having a thickness of 15 to 18 μm. The preferred thickness of the synthetic resin film is
30 to 70 μm. The synthetic resin film is useful not only for providing a printed indication on the lid as a final molded product, but also for supplementing the strength of the foamed resin sheet forming the lid and suppressing cracks and the like. The thickness of the synthetic resin film
If the thickness is more than 80 μm, the cost is high at the mass production level. 15μ
If the thickness is smaller than m, the strength required for the synthetic resin film may be insufficient, and the synthetic resin film itself may be damaged by heat during hot plate forming. The thickness of the synthetic resin film
When the thickness is 30 to 70 μm, the above effect is particularly remarkably exhibited.

この方法で成形した最終成形品である蓋体は、注湯調
理中の保温性に優れ排湯時に火傷を負う危険がなくなる
のみならず、容器本体の嵌合部のような細部がきめ細か
に高精度で成型され、しかも量産化できるものとなる。
また、コストの安い蓋体を提供できるようになる。The lid, which is the final molded product formed by this method, has excellent heat retention during pouring and not only eliminates the danger of burns when draining the hot water, but also provides fine details such as the fitting portion of the container body. It is molded with high precision and can be mass-produced.
In addition, it is possible to provide a low-cost lid.

図面の簡単な説明 図１は積層シートを拡大して断面で示した説明図であ
る。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view showing an enlarged cross section of a laminated sheet.

図2Aは積層シートを熱板と成形型との間に配置した状
態の説明図、図2Bは積層シートを軟化させる工程の説明
図、図2Cは蓋体を成形する工程の説明図、図2Dは離型し
た成形品の説明図である。2A is an explanatory view of a state in which the laminated sheet is disposed between a hot plate and a molding die, FIG. 2B is an explanatory view of a step of softening the laminated sheet, FIG. 2C is an explanatory view of a step of forming a lid, FIG. FIG. 3 is an explanatory diagram of a molded product released from the mold.

図３は容器としての容器本体と蓋体とを示す概略斜視
図である。FIG. 3 is a schematic perspective view showing a container body and a lid as a container.

図４は蓋体の一部を拡大した断面図である。 FIG. 4 is an enlarged sectional view of a part of the lid.

図５は容器の一部を拡大した断面図である。 FIG. 5 is an enlarged sectional view of a part of the container.

発明を実施するための最良の形態 図３は即席食品の容器Ａ、具体的には“即席焼きそ
ば”や“即席麺”に使われる容器本体10とその蓋体20と
を示している。容器本体10は、高発泡倍率（10倍程度）
の発泡ポリスチレン樹脂や発泡ポリプロピレン樹脂で作
られており、表面に印刷は施されていない。BEST MODE FOR CARRYING OUT THE INVENTION FIG. 3 shows a container A for instant food, specifically, a container body 10 and a lid 20 used for “instant fried noodles” and “instant noodles”. The container body 10 has a high expansion ratio (about 10 times)
Made of expanded polystyrene resin or expanded polypropylene resin, and the surface is not printed.

蓋体20は本発明方法である熱板成形方法によって製造
されている。この蓋体20は、発泡ポリスチレン樹脂や発
泡ポリプロピレン樹脂でなる発泡樹脂層の表面に印刷を
施した合成樹脂フィルム（後述する）をその印刷面を内
側にして熱融着により積層一体化した積層構造になって
いる。The lid 20 is manufactured by the hot plate forming method of the present invention. The lid 20 has a laminated structure in which a synthetic resin film (described later) on the surface of a foamed resin layer made of a foamed polystyrene resin or a foamed polypropylene resin is laminated and integrated by heat fusion with its printed surface inside. It has become.

図３〜図５で判るように、蓋体20は、その周縁部に一
体形成された嵌合用突片部21を、容器本体10の上端開口
縁部に一体形成された蓋受け部11に嵌合することによっ
て容器本体10に装着される。そして、装着状態を確実に
するために、上記嵌合用突片部21に係合凸条22を内向き
に形成し、この係合凸条22が上記蓋受け部11に係合する
ようにしてある。また、蓋体20は、上記蓋受け部11を嵌
入状に収容するための中空枠部23をその外周部に膨出状
に有していると共に、その中空枠部23の２つの対角コー
ナー部に注排湯や通気に利用される小開口24とそれを塞
ぐための切起し片25が設けられ、さらに、内容物の商品
名を立体的に表示するための膨出部26や、上記中空枠部
23の内側片部の所定箇所に小突起27などが設けられてい
る。また、蓋体20の表面にはその全体に亘って上記合成
樹脂フィルムによる印刷表示（内容物や調理方法などに
ついての必要情報の表示）がなされており、特に、上記
膨出部26には内容物の商品名の印刷表示が大書きされて
いる。As can be seen from FIGS. 3 to 5, the lid 20 fits the fitting projection 21 integrally formed on the peripheral edge thereof into the lid receiving portion 11 integrally formed on the upper opening edge of the container body 10. By being combined, it is mounted on the container body 10. Then, in order to ensure the mounting state, an engaging ridge 22 is formed inward on the fitting protrusion 21 so that the engaging ridge 22 is engaged with the lid receiving portion 11. is there. The lid body 20 has a hollow frame portion 23 for accommodating the lid receiving portion 11 in a fitting shape in a bulging shape on an outer peripheral portion thereof, and has two diagonal corners of the hollow frame portion 23. The part is provided with a small opening 24 used for pouring and draining and ventilation and a cut-and-raised piece 25 for closing it, and further, a bulging part 26 for three-dimensionally displaying the product name of the contents, The above hollow frame
Small projections 27 and the like are provided at predetermined locations on the inside piece portion of 23. In addition, the entire surface of the lid 20 is printed and displayed with the synthetic resin film (display of necessary information on the contents and the cooking method, etc.). The printed display of the product name of the product is large.

図４に示したように、上記蓋体20は、発泡樹脂層31の
表面に、片面が印刷面42となされた合成樹脂フィルム41
を、その印刷面42を内側にして熱融着により積層して上
記発泡樹脂層31に一体化した構成になっている。なお、
図例の蓋体20の合成樹脂フィルム41は、発泡樹脂層31の
表面に形成した高材料密度のスキン層（不図示）に熱融
着されている。As shown in FIG. 4, the lid 20 is provided on the surface of the foamed resin layer 31 with a synthetic resin film 41 having a printing surface 42 on one side.
Are laminated by heat fusion with the printed surface 42 inside, and are integrated with the foamed resin layer 31. In addition,
The synthetic resin film 41 of the lid 20 in the illustrated example is thermally fused to a high material density skin layer (not shown) formed on the surface of the foamed resin layer 31.

図2A〜Ｄに熱板成形法を説明的に示してある。この熱
板成形では、厚さ0.3〜0.95mmで発泡倍率が1.5〜８倍の
発泡樹脂シート３に上記合成樹脂フィルム41を積層一体
化した積層シート30が用いられる。すなわち、この熱板
成形は、図2Aのように熱板91と成形型92との間の適正位
置に、合成樹脂フィルム41（図１参照）を熱板91側に向
けて積層シート30を配備した後、図2Bのように熱板91と
成形型92とで積層シート30を挾み、成形型92側から矢印
のように吹き出したエアで積層シート30を熱板91に密着
させて100〜140℃程度の熱板91で加熱することにより軟
化させ、その後、図2Cのように熱板91側から吹き出した
エア（エア圧:3〜5kg/cm2）で軟化した積層シート30を
成形型92に密着させて複数の蓋体20を積層シート30の複
数箇所に同時成形する。そして、図2Dのように離型した
後、個々の蓋体20に分断する。2A to 2D illustrate a hot plate forming method. In this hot plate molding, a laminated sheet 30 in which the synthetic resin film 41 is laminated and integrated with the foamed resin sheet 3 having a thickness of 0.3 to 0.95 mm and an expansion ratio of 1.5 to 8 times is used. That is, in this hot plate forming, the laminated sheet 30 is disposed at an appropriate position between the hot plate 91 and the forming die 92 with the synthetic resin film 41 (see FIG. 1) facing the hot plate 91 as shown in FIG. 2A. After that, as shown in FIG. 2B, the laminated sheet 30 is sandwiched between the hot plate 91 and the molding die 92, and the laminated sheet 30 is brought into close contact with the hot plate 91 by air blown out from the molding die 92 side as indicated by an arrow, and The laminate sheet 30 was softened by heating with a hot plate 91 at about 140 ° C., and then softened with air (air pressure: 3 to 5 kg / cm 2 ) blown out from the hot plate 91 side as shown in FIG. 2C. The plurality of lids 20 are simultaneously formed at a plurality of locations of the laminated sheet 30 while being brought into close contact with 92. Then, after releasing as shown in FIG. 2D, the lid 20 is divided into individual lids 20.

熱板成形に際しては、熱板91と成形型92との間の適正
位置に、合成樹脂フィルム41を成形型92側に向けて積層
シート30を配備した後、熱板91と成形型92とで積層シー
ト30を挾み、成形型92側から矢印のように吹き出したエ
アで積層シート30を熱板91に密着させて加熱することに
より軟化させ、その後、熱板91側から吹き出したエアで
軟化した積層シート30を成形型92に密着させて複数の蓋
体20を積層シート30の複数箇所に同時成形する、という
方法を採用することも可能である。At the time of hot plate molding, after disposing the laminated sheet 30 with the synthetic resin film 41 facing the mold 92 at an appropriate position between the hot plate 91 and the mold 92, the hot plate 91 and the mold 92 The laminated sheet 30 is sandwiched, and the laminated sheet 30 is softened by being closely contacted with the hot plate 91 and heated by air blown from the mold 92 side as shown by an arrow, and then softened by the air blown from the hot plate 91 side. It is also possible to adopt a method in which the laminated sheet 30 thus formed is brought into close contact with the mold 92 and a plurality of lids 20 are simultaneously molded at a plurality of locations of the laminated sheet 30.

図１は、上記の熱板成形に供与される積層シート30を
説明的に示した断面図である。この積層シート30におい
て、発泡樹脂シート３の厚さT1は0.3〜0.95mmが適切で
あり、好ましい厚さT1は0.3〜0.9mmである。発泡樹脂シ
ートの厚さＴを0.5〜0.9mmにしたり、0.65〜0.85mmにす
ることも可能である。発泡樹脂シートが0.95mmより厚い
と熱板成形の熱に伝達が悪くて精度よく成形することが
できず、また、成形速度を速めて量産化レベルを維持す
ることもできず、さらに、発泡樹脂シートの全体に熱を
伝えるために熱板成形の時間を長くすると、合成樹脂フ
ィルムの方が加熱されすぎて損じる事態を招く。0.3mm
より薄いと、最終成形品である蓋体に満足のいく断熱性
が得られなくなり、注湯調理中の保温性や排湯時に蓋体
を握った手が熱くなって酷い場合には火傷を負うおそれ
が生じる。発泡樹脂シート３の厚さT1が0.5〜0.9mmであ
ると、熱板91の温度をそれほど高くしなくても成形速度
を無理なく速めることが可能になり、また、最終成形品
である蓋体20の断熱性についても満足のいくものが得ら
れ、注湯調理中の保温性が良好に保たれ、排湯時に蓋体
を握った手が熱くなるという事態が起こり得なくなる。
発泡樹脂シート３の最も好ましつ厚さT1は0.65〜0.85mm
であり、この範囲の厚さであると上記作用が顕著に発揮
される。FIG. 1 is a sectional view illustratively showing a laminated sheet 30 provided for the above-mentioned hot plate forming. In this laminated sheet 30, the thickness T1 of the foamed resin sheet 3 is suitably from 0.3 to 0.95 mm, and the preferable thickness T1 is from 0.3 to 0.9 mm. It is also possible to make the thickness T of the foamed resin sheet 0.5 to 0.9 mm or 0.65 to 0.85 mm. If the foamed resin sheet is thicker than 0.95 mm, the heat from the hot plate molding is poorly transmitted, making it impossible to mold accurately.In addition, the molding speed cannot be increased to maintain the level of mass production. If the time for forming the hot plate is extended to transfer heat to the entire sheet, the synthetic resin film may be overheated and damaged. 0.3mm
If it is thinner, satisfactory heat insulation will not be obtained for the lid, which is the final molded product, and heat will be retained during pouring cooking and the hand holding the lid will become hot when draining water, and if it is severe, burns will occur. There is a fear. When the thickness T1 of the foamed resin sheet 3 is 0.5 to 0.9 mm, the molding speed can be easily increased without increasing the temperature of the hot plate 91 so much. Satisfactory heat insulation can be obtained in the case of No. 20, and the heat retention during the pouring can be kept good, and the situation in which the hand holding the lid becomes hot when draining the hot water cannot occur.
The most preferable thickness T1 of the foamed resin sheet 3 is 0.65 to 0.85 mm
When the thickness is in this range, the above-described effect is remarkably exhibited.

発泡樹脂シート３はその発泡倍率を1.5〜８倍、好ま
しくは1.5〜６倍にしておくとよい。発泡樹脂シート３
の発泡倍率が８倍より大きいと、図2Cの成形工程での細
部、たとえば図３〜図５で説明した嵌合片部21、係合凸
条22、小突起27などの細部の成形がきめ細かくシャープ
に行なわれにくくなる傾向がある。逆に、発泡樹脂シー
ト３の発泡倍率が1.5倍より小さいと、満足のいく断熱
性が得られず、また、同じ厚さの蓋体20を成形するとき
の材料コストが高くつき、製品コストが高騰する。断熱
性がよく、しかも細部をきめ細かくシャープに高精度に
量産成形するためには、発泡樹脂シート３の発泡倍率を
1.5〜６倍にしておくのが好ましく、５倍程度が最良で
ある。The expansion ratio of the foamed resin sheet 3 is 1.5 to 8 times, preferably 1.5 to 6 times. Foamed resin sheet 3
If the expansion ratio is greater than 8, the details in the molding step of FIG. 2C, for example, the details of the fitting piece 21, the engaging ridge 22, and the small protrusion 27 described with reference to FIGS. It tends to be difficult to perform sharply. On the other hand, if the expansion ratio of the foamed resin sheet 3 is smaller than 1.5 times, satisfactory heat insulating properties cannot be obtained, and the material cost for forming the lid 20 having the same thickness is high, and the product cost is low. Soar. In order to perform high-precision mass-production molding with good heat insulation, fine details, sharpness, the foaming ratio of the foamed resin sheet 3 must be adjusted.
It is preferably 1.5 to 6 times, and most preferably about 5 times.

図１に示した合成樹脂フィルム41の厚さT2は15〜80μ
ｍが適切である。合成樹脂フィルム41が80μｍより厚い
と、合成樹脂フィルム41自体が高価になり、量産化レベ
ルでは製品コストの高騰を招く。合成樹脂フィルム41が
15μｍより薄いと、合成樹脂フィルム41に要求される強
度が不足し、また、軟化工程で加えられる熱により合成
樹脂フィルム41自体が損傷するおそれがある。合成樹脂
フィルム41の厚さT2が15〜80μｍであると、熱板91の温
度をそれほど高くしなくても成形速度を無理なく速める
ことが可能になり、特に、30〜70μｍであると上記作用
が顕著に発揮される。The thickness T2 of the synthetic resin film 41 shown in FIG.
m is appropriate. If the thickness of the synthetic resin film 41 is larger than 80 μm, the synthetic resin film 41 itself becomes expensive, resulting in an increase in product cost at the level of mass production. Synthetic resin film 41
If the thickness is less than 15 μm, the strength required for the synthetic resin film 41 may be insufficient, and the synthetic resin film 41 itself may be damaged by heat applied in the softening step. When the thickness T2 of the synthetic resin film 41 is 15 to 80 μm, it is possible to easily increase the molding speed without increasing the temperature of the hot plate 91 so much. Is remarkably exhibited.

なお、厚さT2が15〜80μｍの合成樹脂フィルム41を用
いると次のような利点もある。すなわち、蓋体20を熱板
成形する前には、発泡ポリスチレン樹脂や発泡ポリプロ
ピレン樹脂でなる発泡樹脂層の表面に、印刷を施した合
成樹脂フィルムをその印刷面を内側にして熱融着により
貼り合わせて積層一体化して、蓋体20を成形するための
シート材を作る必要があるが、その貼合せ工程で、合成
樹脂フィルム41の厚さT2が80μｍより厚いと、それが厚
すぎるために熱伝達が悪くなって貼合せ速度を速めるこ
とが困難になり、これを避けるために加熱用ロールの温
度を高くすると合成樹脂フィルム41の印刷面42を損傷す
るおそれがある。合成樹脂フィルム41の厚さT2が15μｍ
より薄いと合成樹脂フィルム41に要求される強度が不足
し、また、積層シート３も満足な強度が得られない。合
成樹脂フィルム41の厚さが15〜80μｍであると、加熱用
ロールの温度をそれほど高くしなくても貼合せ速度を無
理なく速めることが可能になり、特に30〜70μｍである
と上記作用が顕著に発揮される。The use of the synthetic resin film 41 having a thickness T2 of 15 to 80 μm has the following advantages. That is, before forming the lid 20 by hot plate molding, a printed synthetic resin film is adhered to the surface of the foamed resin layer made of foamed polystyrene resin or foamed polypropylene resin by heat fusion with the printed surface inside. It is necessary to make a sheet material for molding the lid 20 in the lamination and integration, but in the laminating step, if the thickness T2 of the synthetic resin film 41 is larger than 80 μm, it is too thick. It is difficult to increase the laminating speed due to poor heat transfer. If the temperature of the heating roll is increased to avoid this, the printing surface 42 of the synthetic resin film 41 may be damaged. The thickness T2 of the synthetic resin film 41 is 15 μm
If it is thinner, the strength required for the synthetic resin film 41 will be insufficient, and the laminated sheet 3 will not be able to obtain satisfactory strength. When the thickness of the synthetic resin film 41 is 15 to 80 μm, it becomes possible to increase the laminating speed without a need to increase the temperature of the heating roll so much. Prominently demonstrated.

図2Bの軟化工程では、熱板91の温度を100〜140℃、成
形型92側から矢印のように吹き出すエアの吹出し圧力を
0.5〜1kg/cm2にし、処理時間を６秒程度にしておけば積
層シート30の軟化が速やかに進行する。このときの熱板
の温度が高すぎたり、エアの吹出し圧力が大きすぎた
り、処理時間が長すぎたりすると、積層シート30の発泡
樹脂層31の裏面や合成樹脂フィルム41の表面が荒れたり
損傷したりするおそれが大きくなり、逆に熱板の温度が
低すぎたり、エアの吹出し圧力が小さすぎたり、処理時
間が短かすぎたりすると、積層シート30が後の成形に必
要な程度にまで軟化されなかったり時間がかかりすぎた
りする。In the softening step of FIG. 2B, the temperature of the hot plate 91 is set to 100 to 140 ° C., and the blowing pressure of the air blown out from the forming mold 92 side as indicated by an arrow.
If the processing time is set to about 0.5 to 1 kg / cm 2 and the processing time is set to about 6 seconds, the softening of the laminated sheet 30 proceeds promptly. If the temperature of the hot plate at this time is too high, the air blowing pressure is too large, or the processing time is too long, the back surface of the foamed resin layer 31 of the laminated sheet 30 or the surface of the synthetic resin film 41 becomes rough or damaged. When the temperature of the hot plate is too low, the air blowing pressure is too small, or the processing time is too short, the laminated sheet 30 may be reduced to the extent necessary for the subsequent molding. Does not soften or takes too long.

図2Bの軟化工程では、熱板91の温度が合成樹脂フィル
ム41の表面側から印刷面42に伝達する。そのため、合成
樹脂フィルム41の印刷面42が荒れて損傷したりしにく
い。2B, the temperature of the hot plate 91 is transmitted from the front surface side of the synthetic resin film 41 to the printing surface. Therefore, the printing surface 42 of the synthetic resin film 41 is hard to be damaged and damaged.

図2Cの成形工程では、熱板91側から矢印のように吹き
出すエアの圧力を３〜5kg/cm2にしておけば、積層シー
ト30が成形型92に確実に密着して蓋体20の成形が精度よ
く速やかに行われる。このときのエアの吹出し圧力が高
すぎると、発泡樹脂シート３の気泡を押しつぶす断熱性
を低下させて満足のいく蓋体が得られず、その吹出し圧
力が低すぎると、確実な成形、特に細部の成形がきめ細
かくシャープになされなくなるおそれがある。また、こ
の成形工程においても、熱板91の温度が合成樹脂フィル
ム41の表面側から印刷面42に伝達するので、合成樹脂フ
ィルム41の印刷面42が荒れて損傷することはない。In the forming step of FIG. 2C, if the pressure of the air blown from the hot plate 91 side as shown by an arrow is set to 3 to 5 kg / cm 2 , the laminated sheet 30 is securely adhered to the forming mold 92 and the cover 20 is formed. Is performed quickly and accurately. If the blowing pressure of the air at this time is too high, the heat insulating property of crushing the air bubbles of the foamed resin sheet 3 is reduced, and a satisfactory lid is not obtained. If the blowing pressure is too low, reliable molding, particularly in detail May not be finely and sharply formed. Also in this molding step, the temperature of the hot plate 91 is transmitted from the front surface side of the synthetic resin film 41 to the printing surface 42, so that the printing surface 42 of the synthetic resin film 41 is not roughened and damaged.

図１の積層シート30を熱板成形して得られる最終製品
である蓋体20は、その全厚を0.4〜1.0mm、好ましくは0.
40〜08mmに仕上げることが望ましい。積層シート30は熱
板成形工程を経ることにより多少圧縮されることがある
ので、この厚み範囲に仕上げることが可能である。蓋体
20が0.40〜0.8mmの全厚に仕上げられていると、注湯調
理された調理後は排湯される即席食品の容器の蓋体に要
求される剛性および蓋体を容器本体に対して嵌合・取外
しする際に、確実な嵌着と容易な取外しが行える適度な
弾性力が確保される強さとなる。The lid 20, which is a final product obtained by hot-plate forming the laminated sheet 30 of FIG. 1, has a total thickness of 0.4 to 1.0 mm, preferably 0.1 to 1.0 mm.
It is desirable to finish to 40-08mm. Since the laminated sheet 30 may be somewhat compressed during the hot plate forming step, it can be finished in this thickness range. Lid
If 20 is finished to a total thickness of 0.40 to 0.8 mm, the required rigidity and lid of the container of the instant food container to be drained after pouring and cooking are fitted to the container body At the time of joining / removing, it is strong enough to secure an appropriate elastic force for secure fitting and easy removal.

以下のようにして製造された蓋体20は、積層シート30
を熱板成形したものであるから、合成樹脂フィルム41印
刷面42による印刷箇所が、その蓋体20の適正な位置から
ずれずに正確に定まっている。したがって、蓋体20の膨
出部26で表示される商品名、使用方法、調理方法等の各
記載、および模様等も、その蓋体20の適正な位置に表示
される。The lid 20 manufactured as described below is a laminated sheet 30
Is formed by hot plate molding, so that the printing position on the printing surface 42 of the synthetic resin film 41 is accurately determined without shifting from an appropriate position of the lid 20. Therefore, the description of the product name, the usage method, the cooking method, and the like, the pattern, and the like displayed on the bulging portion 26 of the lid 20 are also displayed at the appropriate positions on the lid 20.

産業上の利用可能性 本発明による食品容器蓋体の熱板成形方法は、発泡樹
脂シートに合成樹脂フィルムを積層一体化した積層シー
トを熱板成形する、というものであり、発泡樹脂シート
との厚さとして0.3〜0.95mmまたは0.3〜0.9mmを選択で
き、合成樹脂フィルムの厚さとして15〜80μｍまたは30
〜70μｍを選択できる。本発明方法によって成形した最
終成形品である蓋体は、注湯調理中の保温性に優れ排湯
時に火傷を負う危険がなくなるのみならず、合成樹脂フ
ィルムに施された印刷表示が正規の位置に位置ずれなく
配置され、また、容器本体の嵌合部のような細部がきめ
細かに高精度で成形されたものとなる。また、蓋体を安
価に提供できるようになる。INDUSTRIAL APPLICABILITY The hot plate forming method for a food container lid according to the present invention is to hot plate mold a laminated sheet obtained by laminating and integrating a synthetic resin film on a foamed resin sheet. The thickness can be selected from 0.3 to 0.95 mm or 0.3 to 0.9 mm, and the thickness of the synthetic resin film is 15 to 80 μm or 30
7070 μm can be selected. The lid, which is the final molded product formed by the method of the present invention, is excellent in heat retention during pouring cooking and not only eliminates the danger of burns when draining the hot water, but also allows the printed display on the synthetic resin film to be in a proper position. , And the details such as the fitting portion of the container body are precisely formed with high precision. In addition, the lid can be provided at low cost.

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｂ２９Ｌ 22:00 (58)調査した分野(Int.Cl.6，ＤＢ名) B29C 51/00 - 51/46 B32B 5/18 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 6 identification code FI B29L 22:00 (58) Fields surveyed (Int.Cl. 6 , DB name) B29C 51/00-51/46 B32B 5/18

Claims (4)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】厚さ0.3〜0.95mmの発泡ポリスチレンや発
泡ポリプロピレンよりなる発泡樹脂シート（発泡倍率1.
5〜６倍）に、予め片面に印刷が施された厚さ15〜80μ
ｍの合成樹脂フィルムを前記印刷面が前記発泡樹脂シー
トに接するように積層一体化した積層シートを用意し、
この積層シートを、熱板と成形型との間に挟持した状態
下で前記熱板の熱で加熱軟化してから前記熱板から吹出
すエアー圧で前記成形型に密着させて食品容器蓋体を成
形することを特徴とする食品容器蓋体の熱板成形方法。1. A foamed resin sheet (expansion ratio: 1.35) made of expanded polystyrene or expanded polypropylene having a thickness of 0.3 to 0.95 mm.
5 to 6 times), with a thickness of 15 to 80μ printed on one side in advance
m to prepare a laminated sheet in which the synthetic resin film is laminated and integrated such that the printing surface is in contact with the foamed resin sheet,
This laminated sheet is heated and softened by the heat of the hot plate while being sandwiched between a hot plate and a forming die, and then brought into close contact with the forming die by air pressure blown out of the hot plate to form a food container lid. A hot plate forming method for a food container lid, characterized by forming a hot plate. 【請求項２】厚さ0.3〜0.9mmの発泡ポリスチレンや発泡
ポリプロピレンよりなる発泡樹脂シート（発泡倍率1.5
〜６倍）に、予め片面に印刷が施された厚さ15〜80μｍ
の合成樹脂フィルムを前記印刷面が前記発泡樹脂シート
に接するように積層一体化した積層シートを用意し、こ
の積層シートを、熱板と成形型との間に挟持した状態下
で前記熱板の熱で加熱軟化してから前記熱板から吹出す
エアー圧で前記成形型に密着させて食品容器蓋体を成形
することを特徴とする食品容器蓋体の熱板成形方法。2. A foamed resin sheet (expansion ratio 1.5) made of expanded polystyrene or expanded polypropylene having a thickness of 0.3 to 0.9 mm.
~ 6 times), 15-80μm thick printed on one side in advance
A laminated sheet is prepared by laminating and integrating the synthetic resin film of the above, so that the printing surface is in contact with the foamed resin sheet, and the laminated sheet is sandwiched between a hot plate and a molding die. A hot plate forming method for a food container lid, wherein the food container lid is molded by being heated and softened by heat and then brought into close contact with the molding die by air pressure blown from the hot plate. 【請求項３】厚さ0.3〜0.95mmの発泡ポリスチレンや発
泡ポリプロピレンよりなる発泡樹脂シート（発泡倍率1.
5〜６倍）に、予め片面に印刷が施された厚さ30〜70μ
ｍの合成樹脂フィルムを前記印刷面が前記発泡樹脂シー
トに接するように積層一体化した積層シートを用意し、
この積層シートを、熱板と成形型との間に挟持した状態
下で前記熱板の熱で加熱軟化してから前記熱板から吹出
すエアー圧で前記成形型に密着させて食品容器蓋体を成
形することを特徴とする食品容器蓋体の熱板成形方法。3. A foamed resin sheet made of foamed polystyrene or polypropylene having a thickness of 0.3 to 0.95 mm (expansion ratio 1.
5 ~ 6 times), 30 ~ 70μ thickness printed on one side in advance
m to prepare a laminated sheet in which the synthetic resin film is laminated and integrated such that the printing surface is in contact with the foamed resin sheet,
This laminated sheet is heated and softened by the heat of the hot plate while being sandwiched between a hot plate and a forming die, and then brought into close contact with the forming die by air pressure blown out of the hot plate to form a food container lid. A hot plate forming method for a food container lid, characterized by forming a hot plate. 【請求項４】厚さ0.3〜0.9mmの発泡ポリスチレンや発泡
ポリプロピレンよりなる発泡樹脂シート（発泡倍率1.5
〜６倍）に、予め片面に印刷が施された厚さ30〜70μｍ
の合成樹脂フィルムを前記印刷面が前記発泡樹脂シート
に接するように積層一体化した積層シートを用意し、こ
の積層シートを、熱板と成形型との間に挟持した状態下
で前記熱板の熱で加熱軟化してから前記熱板から吹出す
エアー圧で前記成形型に密着させて食品容器蓋体を成形
することを特徴とする食品容器蓋体の熱板成形方法。4. A foamed resin sheet (expansion ratio 1.5) made of expanded polystyrene or expanded polypropylene having a thickness of 0.3 to 0.9 mm.
~ 6 times), 30-70μm thick printed on one side in advance
A laminated sheet is prepared by laminating and integrating the synthetic resin film of the above, so that the printing surface is in contact with the foamed resin sheet, and the laminated sheet is sandwiched between a hot plate and a molding die. A hot plate forming method for a food container lid, wherein the food container lid is molded by being heated and softened by heat and then brought into close contact with the molding die by air pressure blown from the hot plate.
JP9509123A 1995-08-25 1996-02-02 Hot plate molding method for food container lid Expired - Lifetime JP2935066B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP7-217159 1995-08-25
JP21715995 1995-08-25
PCT/JP1996/000210 WO1997007966A1 (en) 1995-08-25 1996-02-02 Method of molding hot plate of food container lid

Publications (1)

Publication Number Publication Date
JP2935066B2 true JP2935066B2 (en) 1999-08-16

Family

ID=16699786

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9509123A Expired - Lifetime JP2935066B2 (en) 1995-08-25 1996-02-02 Hot plate molding method for food container lid

Country Status (2)

Country Link
JP (1) JP2935066B2 (en)
WO (1) WO1997007966A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6164484A (en) * 1998-12-15 2000-12-26 Igloo Corporation Insulated snap fit container lid
JP2011047075A (en) * 2009-08-27 2011-03-10 Toshiko Izumi Cap mainly consisting of foaming resin material

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58196239A (en) * 1982-05-11 1983-11-15 Sekisui Plastics Co Ltd Polystyrene foam sheet suitable for use in fabrication

Also Published As

Publication number Publication date
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