JPH0212174Y2 - - Google Patents
Info
- Publication number
- JPH0212174Y2 JPH0212174Y2 JP11945484U JP11945484U JPH0212174Y2 JP H0212174 Y2 JPH0212174 Y2 JP H0212174Y2 JP 11945484 U JP11945484 U JP 11945484U JP 11945484 U JP11945484 U JP 11945484U JP H0212174 Y2 JPH0212174 Y2 JP H0212174Y2
- Authority
- JP
- Japan
- Prior art keywords
- synthetic resin
- container
- resin layer
- foam sheet
- resin
- 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
- 229920005989 resin Polymers 0.000 claims description 26
- 239000011347 resin Substances 0.000 claims description 26
- 229920003002 synthetic resin Polymers 0.000 claims description 24
- 239000000057 synthetic resin Substances 0.000 claims description 24
- 239000006260 foam Substances 0.000 claims description 23
- JLBJTVDPSNHSKJ-UHFFFAOYSA-N 4-Methylstyrene Chemical compound CC1=CC=C(C=C)C=C1 JLBJTVDPSNHSKJ-UHFFFAOYSA-N 0.000 claims description 17
- 239000002131 composite material Substances 0.000 claims description 6
- 229920005992 thermoplastic resin Polymers 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 25
- 235000013305 food Nutrition 0.000 description 10
- 239000000178 monomer Substances 0.000 description 7
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 6
- 238000009413 insulation Methods 0.000 description 5
- 230000014759 maintenance of location Effects 0.000 description 5
- 229920005990 polystyrene resin Polymers 0.000 description 5
- 235000013399 edible fruits Nutrition 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- 229920001577 copolymer Polymers 0.000 description 3
- 238000004132 cross linking Methods 0.000 description 3
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
- 239000012790 adhesive layer Substances 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 229920001519 homopolymer Polymers 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- XYLMUPLGERFSHI-UHFFFAOYSA-N alpha-Methylstyrene Chemical compound CC(=C)C1=CC=CC=C1 XYLMUPLGERFSHI-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229920005669 high impact polystyrene Polymers 0.000 description 1
- 239000004797 high-impact polystyrene Substances 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000004798 oriented polystyrene Substances 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000306 polymethylpentene Polymers 0.000 description 1
- 239000011116 polymethylpentene Substances 0.000 description 1
- 229920001955 polyphenylene ether Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 235000013311 vegetables Nutrition 0.000 description 1
Description
〔産業上の利用分野〕
本考案は、架橋された合成樹脂発泡シートを主
材とする食品容器、果物用トレーなどに好適な容
器に関する。
〔従来の技術〕
従来、断熱性や保温性あるいは保形性、剛性等
の点からポリスチレン系樹脂発泡体、または該発
泡体層にハイインパクトポリスチレン、二軸延伸
ポリスチレン、ポリエチレン等の樹脂フイルムを
積層した食品容器が一般的であつた。
また、本考案者らは、上記の食品容器が耐油性
殊に高温での耐油性等が劣ることに鑑み、ポリス
チレン系樹脂発泡シートの片面にポリブチレンテ
レフタレート系樹脂フイルムや、ポリメチルペン
テン樹脂フイルムを積層した食品容器について、
先に提案した（実願昭59−24281号実開昭60−
136911号、実願昭59−24282号実開昭60−136912
号）。
〔解決しようとする問題点〕
しかしながら、上記食品容器は、耐油性、耐熱
性等が不十分なポリスチレン樹脂発泡シートを主
材としているため、上記問題点を根本的に解決す
るものではなかつた。
また、ポリスチレン樹脂発泡シートなどは、弾
性、断熱保温性を大きくするため、発泡倍率を大
きくすると、剛性、特に曲げ剛性や保形性などが
小さくなり、これらの特性を両立できないという
欠点があつた。
従つて、幾段にも重ねて使用され、弾力性や断
熱保温性等を必要とする果物用トレーなどにあつ
ては、弾力性等を大きくすると、収納状態で容器
の片端を持つた場合、片端部などで破損が生じる
一方、破損を防止するために、肉厚とすると経済
的でないという欠点があつた。
本考案は、上記に鑑みてさらに研究、検討を重
ねた結果なされたもので、耐油性や耐熱性が大き
く、しかも弾力性、断熱保温性と剛性、保形性の
両特性を併せ持ち、食品用容器、果物用トレーな
ど種々の用途に好適な容器を提供することを目的
とする。
〔問題点を解決するための手段〕
本考案は、合成樹脂発泡シートと、その少なく
とも片面に積層した非発泡の合成樹脂層との複合
シートから成形された容器であつて、前記合成樹
脂発泡シートに架橋されたパラメチルスチレン系
樹脂発泡シートを用いることにより上記のような
問題点を解決するものである。また、より好まし
くは、特定の発泡倍率等や架橋度を有する架橋さ
れたパラメチルスチレン系樹脂発泡シートや、架
橋された熱可塑性樹脂層を非発泡の合成樹脂層と
して用いたり、非発泡の合成樹脂を一層または多
層とし、また、接着剤層も架橋させ、更には非発
泡の合成樹脂層を少なくとも容器内面に配するこ
とにより、上記のような問題点を解決するもので
ある。
〔作 用〕
本考案に係る容器の合成樹脂発泡シートの素材
であるパラメチルスチレン系樹脂は、ポリスチレ
ン樹脂に比べて耐熱性などの諸特性が良いと共に
比重が小さく、軟化点が高いため単位重量当りの
生産量を大きくし、成形時の冷却時間が短縮でき
る。
このような特性をもつパラメチルスチレン系樹
脂を用いた架橋発泡シートは、未架橋のものに比
べて耐熱性や剛性、特に曲げ剛性あるいは耐油性
などの諸特性が著しく大きい。
また、上記発泡シートの少なくとも片面には非
発泡の合成樹脂層が積層されており、この樹脂層
には容器として要求される諸特性に応じてガスバ
リヤー性、耐油性、剛性、表面硬度、印刷性など
の諸機能が複合シート、容器に付与される。
この樹脂層として架橋された熱可塑性樹脂層を
用いたものは、耐熱性や耐油性などが更に優れ、
また樹脂層を多層としたものは、更に複合的機能
を有する。
また、積層時に用いる接着剤が架橋したもの
は、耐熱性等が更に向上する。
しかも、上記発泡シートと上記樹脂層とが一体
に積層されているため、上記種々の特性、機能が
同時に発現し、また上記発泡シートは特定の発泡
倍率等を有するため、断熱保温性が成形加工性が
よく、更には、積層された上記樹脂層の表面は平
滑であるため、ごみや汚物などが付着しにくい。
〔実施例〕
以下に本考案に係る容器の実施例を図面に基づ
いて説明する。
第１図、第２図、第６図および第７図中、符号
Ａは、本考案に係る容器を示し、容器Ａは、電子
線により架橋されたパラメチルスチレン系樹脂発
泡シート１と、その片面に積層した非発泡の合成
樹脂層２との複合シートを、上記樹脂層２が容器
内面となるように真空成形してなるものである。
上記の架橋されたパラメチルスチレン系樹脂発
泡シート１の素材であるパラメチルスチレン系樹
脂は、パラメチルスチレンモノマーの単独重合体
や他のモノマーとの共重合体あるいは、これらの
重合体の混合物やこれら重合体と他の重合体との
混合物であつてもよい。
パラメチルスチレンと共重合し得るモノマーと
しては、スチレン、α−メチルスチレンなどのス
チレン系モノマー、あるいは、メタクリル酸、メ
タクリル酸メチル、アクリロニトリルなどのアク
リル系モノマー、ブタジエンなどのオレフイン系
モノマー、無水マレイン酸などが挙げられる。ま
た、パラメチルスチレンモノマーの工業製品に含
まれているオルトあるいはメタ異性体も同様に使
用することができる。
この場合、後述する架橋反応が起こり易くする
ため、パラメチルスチレンを30重量％以上含有す
る共重合体が好ましい。
また、混合樹脂によるときは、上記のようなパ
ラメチルスチレンの単独重合体や共重合体をスチ
レン樹脂、ABS樹脂、ポリフエニレンエーテル
樹脂、ポリ塩化ビニル樹脂などの他の重合体に50
重量％以上混合したもの、または、混合樹脂中、
パラメチルスチレン成分を15重量％以上含有する
[Industrial Application Field] The present invention relates to a container suitable for food containers, fruit trays, etc., which is mainly made of a crosslinked synthetic resin foam sheet. [Prior art] Conventionally, polystyrene resin foams have been used in terms of heat insulation, heat retention, shape retention, rigidity, etc., or resin films such as high impact polystyrene, biaxially oriented polystyrene, polyethylene, etc. have been laminated on the foam layer. Food containers made of aluminum were common. In addition, in view of the fact that the food containers mentioned above have poor oil resistance, especially oil resistance at high temperatures, the present inventors have also added a polybutylene terephthalate resin film or a polymethylpentene resin film to one side of the polystyrene resin foam sheet. Regarding food containers laminated with
I proposed it earlier (Utility Application No. 59-24281, Utility Application No. 1983-
No. 136911, Utility Application No. 1983-24282 Utility Application No. 136912, No. 136912
issue). [Problems to be Solved] However, the above-mentioned food containers are mainly made of polystyrene resin foam sheets that have insufficient oil resistance, heat resistance, etc., and therefore the above-mentioned problems have not been fundamentally solved. In addition, polystyrene resin foam sheets have the disadvantage of increasing elasticity, heat insulation, and heat retention, but increasing the foaming ratio reduces rigidity, especially bending rigidity and shape retention, making it impossible to achieve both of these properties. . Therefore, for fruit trays that are stacked in multiple tiers and require elasticity, heat insulation, etc., if the elasticity is increased, when one end of the container is held in the stored state, While breakage occurs at one end, it is not economical to make it thicker to prevent breakage. This invention was developed as a result of further research and consideration in view of the above, and it has high oil resistance and heat resistance, as well as elasticity, heat insulation and heat retention properties, rigidity, and shape retention properties, and is suitable for food use. The purpose is to provide containers suitable for various uses such as containers and fruit trays. [Means for Solving the Problems] The present invention provides a container molded from a composite sheet of a synthetic resin foam sheet and a non-foamed synthetic resin layer laminated on at least one side thereof, the container being formed from a composite sheet of a synthetic resin foam sheet and a non-foamed synthetic resin layer laminated on at least one side thereof. The above-mentioned problems are solved by using a foamed paramethylstyrene resin sheet crosslinked with . More preferably, a crosslinked para-methylstyrene resin foam sheet having a specific expansion ratio or degree of crosslinking, a crosslinked thermoplastic resin layer, or a non-foamed synthetic resin layer is preferably used. The above-mentioned problems are solved by using one or more resin layers, crosslinking the adhesive layer, and disposing a non-foamed synthetic resin layer at least on the inner surface of the container. [Function] Para-methylstyrene resin, which is the material for the synthetic resin foam sheet of the container according to the present invention, has better properties such as heat resistance than polystyrene resin, has a lower specific gravity, and has a higher softening point, so the unit weight is lower. It can increase the production volume per unit and shorten the cooling time during molding. A cross-linked foam sheet using a para-methylstyrene resin having such characteristics has significantly greater properties such as heat resistance and rigidity, particularly flexural rigidity and oil resistance, than non-cross-linked sheets. In addition, a non-foamed synthetic resin layer is laminated on at least one side of the foamed sheet, and this resin layer has gas barrier properties, oil resistance, rigidity, surface hardness, printing, etc. according to the various properties required for the container. Various functions such as gender are imparted to composite sheets and containers. Those using a crosslinked thermoplastic resin layer as this resin layer have even better heat resistance and oil resistance.
Furthermore, a multi-layered resin layer has more complex functions. In addition, when the adhesive used during lamination is crosslinked, heat resistance and the like are further improved. Moreover, since the foam sheet and the resin layer are integrally laminated, the various properties and functions described above are simultaneously expressed, and the foam sheet has a specific expansion ratio, etc. Furthermore, since the surface of the laminated resin layer is smooth, dust and dirt are less likely to adhere to it. [Example] Examples of the container according to the present invention will be described below based on the drawings. In FIG. 1, FIG. 2, FIG. 6, and FIG. 7, the symbol A indicates a container according to the present invention. A composite sheet with a non-foamed synthetic resin layer 2 laminated on one side is vacuum-formed so that the resin layer 2 forms the inner surface of the container. The paramethylstyrene resin that is the material of the crosslinked paramethylstyrene resin foam sheet 1 is a homopolymer of paramethylstyrene monomer, a copolymer with other monomers, or a mixture of these polymers. It may also be a mixture of these polymers and other polymers. Monomers that can be copolymerized with para-methylstyrene include styrene monomers such as styrene and α-methylstyrene, acrylic monomers such as methacrylic acid, methyl methacrylate, and acrylonitrile, olefinic monomers such as butadiene, and maleic anhydride. Examples include. Further, ortho or meta isomers contained in industrial products of para-methylstyrene monomer can be used similarly. In this case, a copolymer containing 30% by weight or more of paramethylstyrene is preferred in order to facilitate the crosslinking reaction described below. In addition, when using a mixed resin, the above homopolymer or copolymer of paramethylstyrene may be mixed with other polymers such as styrene resin, ABS resin, polyphenylene ether resin, or polyvinyl chloride resin.
Mixed by weight% or more, or in mixed resin,
Contains 15% by weight or more of paramethylstyrene component
本考案に係る容器は、架橋されたパラメチルス
チレン系樹脂発泡シートが耐熱性等に優れるた
め、温度の高い条件のもとで使用する容器、例え
ば電子レンジ等で加熱・調理する食品容器として
好適である。また非発泡の架橋された合成樹脂層
を積層した容器は、特に耐熱性等がよく、更に好
ましい。しかも、剛性や強度が大きいため、加熱
時に変形することもない。更に、接着剤層も架橋
されたものは、耐熱性が更に向上するため好まし
い。
また、発泡シートを主材としており断熱保温
性、弾力性を有し、また軽量であるため持ち運び
が楽であり、しかも架橋されているため剛性や強
度、保形性などが大きい。即ち、弾力性、断熱保
温性と剛性、保形性の両特性を併せもつている。
また、種々の特性をもつ非発泡の合成樹脂層が
一体に積層されており、上記発泡シートの特性と
上記合成樹脂層の両特性が同時に発現するため、
広範囲の用途に適用できる。例えばガスバリヤー
性の合成樹脂層を積層したものは、野菜や果物あ
るいは各種食品を収納しても鮮度を落すことがな
く保存性に優れ、また耐油性の合成樹脂層を積層
したものは、油状物を含有する食品用容器、トレ
ーなどに好適であり、また上記発泡シートの保護
効果にも優れている。
非発泡の合成樹脂層は平滑であり、ごみ等が付
着し難いため衛生的であり、また汚れたとしても
容易に洗浄できる。従つて、食品等と接する内面
に上記合成樹脂層を配したものは、食品用容器、
トレーなどに好適である。
更には、前記のように生産性の大きいパラメチ
ルスチレン系樹脂を用い、また複合シートは成形
加工性がよく、大量生産に適するため安価な容器
を提供することができる。
The container according to the present invention is suitable as a container used under high temperature conditions, such as a food container heated and cooked in a microwave oven, etc., because the crosslinked paramethylstyrene resin foam sheet has excellent heat resistance. It is. Further, a container laminated with a non-foamed crosslinked synthetic resin layer is particularly preferable since it has good heat resistance. Moreover, since it has high rigidity and strength, it does not deform when heated. Furthermore, it is preferable that the adhesive layer is also crosslinked, since the heat resistance is further improved. In addition, since the foam sheet is the main material, it has heat insulating properties, elasticity, and is lightweight, making it easy to carry.Furthermore, since it is crosslinked, it has high rigidity, strength, and shape retention. That is, it has both elasticity, heat insulation and heat retention properties, and rigidity and shape retention properties. In addition, non-foamed synthetic resin layers with various properties are integrally laminated, and both the properties of the foam sheet and the synthetic resin layer are simultaneously expressed, so
Applicable to a wide range of applications. For example, products with a layer of synthetic resin that has gas barrier properties have excellent storage stability and do not lose their freshness even when storing vegetables, fruits, or various foods, and products with a layer of oil-resistant synthetic resin have a layer of oil-resistant material. It is suitable for food containers, trays, etc. that contain things, and also has an excellent protective effect on the foam sheet. The non-foamed synthetic resin layer is smooth and hygienic because it is difficult for dirt to adhere to it, and even if it becomes dirty, it can be easily cleaned. Therefore, containers with the above-mentioned synthetic resin layer arranged on the inner surface that comes into contact with food, etc.
Suitable for trays, etc. Furthermore, as mentioned above, a highly productive paramethylstyrene resin is used, and the composite sheet has good moldability and is suitable for mass production, making it possible to provide an inexpensive container.
第１図は第２図の−断面図、第２図は容器
の斜視図、第３図は他の実施例に係る容器の一部
欠截斜視図、第４図は第３図の−断面図、第
５図は他の実施例に係る断面図、第６図、第７図
は他の実施例に係る容器の一部欠截斜視図を示
す。
符号の説明、１……架橋されたパラメチルスチ
レン系樹脂発泡シート、２……非発泡の合成樹脂
層。
1 is a cross-sectional view of FIG. 2, FIG. 2 is a perspective view of the container, FIG. 3 is a partially cutaway perspective view of a container according to another embodiment, and FIG. 4 is a cross-section of FIG. 3. 5 and 5 are sectional views according to other embodiments, and FIGS. 6 and 7 are partially cutaway perspective views of containers according to other embodiments. Explanation of symbols: 1...Crosslinked paramethylstyrene resin foam sheet, 2...Non-foamed synthetic resin layer.
Claims (1)
に積層した非発泡の合成樹脂層との複合シート
から成形された容器であつて、前記合成樹脂発
泡シートが、架橋されたパラメチルスチレン系
樹脂発泡シートであることを特徴とする容器。 ２ 架橋されたパラメチルスチレン系樹脂発泡シ
ートが、発泡倍率1.5〜40倍，厚み0.5〜５mm，
ゲル分率５〜95％のシートである実用新案登録
請求の範囲第１項記載の容器。 ３ 非発泡の合成樹脂層が、架橋された熱可塑性
樹脂層である実用新案登録請求の範囲第１項記
載の容器。 ４ 非発泡の合成樹脂層が一層又は多層である実
用新案登録請求の範囲第１項又は第３項記載の
容器。 ５ 非発泡の合成樹脂層が少なくとも容器内面に
配された実用新案登録請求の範囲第１項，第３
項，第４項のいずれか１項に記載の容器。[Claims for Utility Model Registration] 1. A container formed from a composite sheet of a synthetic resin foam sheet and a non-foamed synthetic resin layer laminated on at least one side thereof, wherein the synthetic resin foam sheet is cross-linked. A container characterized by being made of a paramethylstyrene resin foam sheet. 2 The crosslinked paramethylstyrene resin foam sheet has an expansion ratio of 1.5 to 40 times, a thickness of 0.5 to 5 mm,
The container according to claim 1, which is a sheet having a gel fraction of 5 to 95%. 3. The container according to claim 1, wherein the non-foamed synthetic resin layer is a crosslinked thermoplastic resin layer. 4. The container according to claim 1 or 3, which has a single or multilayer non-foamed synthetic resin layer. 5 Utility model registration claims paragraphs 1 and 3 in which a non-foamed synthetic resin layer is arranged at least on the inner surface of the container
The container described in any one of Items 1 and 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11945484U JPS6135118U (en) | 1984-07-31 | 1984-07-31 | container |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11945484U JPS6135118U (en) | 1984-07-31 | 1984-07-31 | container |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6135118U JPS6135118U (en) | 1986-03-04 |
| JPH0212174Y2 true JPH0212174Y2 (en) | 1990-04-05 |
Family
ID=30678326
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11945484U Granted JPS6135118U (en) | 1984-07-31 | 1984-07-31 | container |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6135118U (en) |
-
1984
- 1984-07-31 JP JP11945484U patent/JPS6135118U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6135118U (en) | 1986-03-04 |
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