JPH05305680A - Production of heat-resistant container - Google Patents

Production of heat-resistant container

Info

Publication number
JPH05305680A
JPH05305680A JP13604492A JP13604492A JPH05305680A JP H05305680 A JPH05305680 A JP H05305680A JP 13604492 A JP13604492 A JP 13604492A JP 13604492 A JP13604492 A JP 13604492A JP H05305680 A JPH05305680 A JP H05305680A
Authority
JP
Japan
Prior art keywords
resin
container
temperature
sheet
weight
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.)
Pending
Application number
JP13604492A
Other languages
Japanese (ja)
Inventor
Tsutomu Aso
勉 麻生
Yusuke Morita
雄介 森田
Kenji Mita
健二 見田
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.)
Shin Etsu Polymer Co Ltd
Shin Etsu Chemical Co Ltd
Original Assignee
Shin Etsu Polymer Co Ltd
Shin Etsu Chemical Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shin Etsu Polymer Co Ltd, Shin Etsu Chemical Co Ltd filed Critical Shin Etsu Polymer Co Ltd
Priority to JP13604492A priority Critical patent/JPH05305680A/en
Publication of JPH05305680A publication Critical patent/JPH05305680A/en
Pending legal-status Critical Current

Links

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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/0005—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor characterised by the material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • B29K2067/006—PBT, i.e. polybutylene terephthalate

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

PURPOSE:To produce a heat-resistant container excellent in heat resistance and having transparency without generating the deformation or opacification of the container at the time of molding. CONSTITUTION:A sheet obtained from a resin compsn. consisting of 10-100 pts.wt. of at least one kind of a polybutylene terephthalate resin and 90-0 pts.wt of at least one kind of a polyethylene terephthalate resin is preheated at temp. higher than the cold crystallizing temp. of the resin compsn. but lower than the highest m.p. among the melting points of the resins constituting the compsn. and subsequently molded in a cooled mold to produce a heat-resistant container.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、耐熱容器の製造方法、
特に電子レンジ等に用いられるプラスチック容器や、加
熱殺菌、ホットフィルが可能な容器の製造方法に関す
る。FIELD OF THE INVENTION The present invention relates to a method for manufacturing a heat-resistant container,
In particular, the present invention relates to a method for producing a plastic container used in a microwave oven or the like, or a container capable of heat sterilization and hot filling.

【０００２】[0002]

【従来の技術】従来、電子レンジに用いられるワンウェ
イタイプのプラスチック容器の素材としては、フィラー
入りのポリプロピレン（ＰＰ）及び結晶化されたポリエ
チレンテレフタレート（Ｃ−ＰＥＴ）等の樹脂が広く使
用されているが、これらの樹脂は一般に不透明である。
一方、透明なプラスチック容器、特にブロー成形容器の
素材としては、非結晶のポリエチレンテレフタレート
（Ａ−ＰＥＴ）やポリ塩化ビニル（ＰＶＣ）等の樹脂が
知られているが、これらは耐熱性に欠けるという問題が
ある。2. Description of the Related Art Conventionally, as a material for a one-way type plastic container used in a microwave oven, filler-containing polypropylene (PP) and resin such as crystallized polyethylene terephthalate (C-PET) are widely used. However, these resins are generally opaque.
On the other hand, as materials for transparent plastic containers, particularly blow molded containers, amorphous polyethylene terephthalate (A-PET), polyvinyl chloride (PVC), and other resins are known, but they lack heat resistance. There's a problem.

【０００３】また、透明で耐熱性を有するプラスチック
素材としては、例えばポリアリレート（ＰＡＲ）、ポリ
カーボネート（ＰＣ）、ポリメチルペンテン（ＴＰＸ）
等が知られているが、これらの樹脂からなる容器は、通
常インジェクション成形によって製造される。しかし、
この成形の場合、他の成形法に比べて金型の製作が難し
いことからそのコストが高く、また肉厚の薄いものを成
形することができない等の理由により、販売ロットの小
さいワンウェイタイプの容器としては適当でないという
問題がある。Examples of transparent and heat-resistant plastic materials include polyarylate (PAR), polycarbonate (PC) and polymethylpentene (TPX).
However, containers made of these resins are usually manufactured by injection molding. But,
In the case of this molding, it is more difficult to manufacture the mold than other molding methods, so the cost is high, and because one with a thin wall cannot be molded, a one-way type container with a small sales lot is sold. There is a problem that is not suitable as.

【０００４】そのため、このようなワンウェイタイプの
用途には、真空、圧空、真空圧空、プレス成形等の二次
成形によりシートを成形した容器が用いられている。こ
の成形に使用されるプラスチック材料の中で特にポリブ
チレンテレフタレート（以下、ＰＢＴと略記する。）系
樹脂は結晶性であり耐熱性に優れ、他のエンジニアリン
グプラスチックに比べ価格が比較的安価であり、かつ透
明性に優れたポリエチレンテレフタレート（以下、ＰＥ
Ｔと略記する。）系樹脂との相溶性も良いため、本発明
者らは、ＰＢＴ系樹脂とＰＥＴ系樹脂とからなる樹脂組
成物を素材として、真空、圧空、真空圧空、プレス成形
等の二次成形により容器を成形する方法を提案している
（特開平４−６３８３６号公報参照）。Therefore, for such a one-way type application, a container in which a sheet is molded by secondary molding such as vacuum, compressed air, vacuum compressed air, and press molding is used. Among the plastic materials used for this molding, polybutylene terephthalate (hereinafter abbreviated as PBT) type resin is crystalline and has excellent heat resistance, and is relatively inexpensive compared to other engineering plastics. And polyethylene terephthalate (hereinafter PE
Abbreviated as T. Since the compatibility with the () type resin is also good, the present inventors have used a resin composition composed of a PBT type resin and a PET type resin as a raw material to carry out secondary molding such as vacuum, pressure air, vacuum pressure air and press molding. Has been proposed (see Japanese Patent Laid-Open No. 4-63836).

【０００５】[0005]

【発明が解決しようとする課題】しかし、真空、圧空、
真空圧空、プレス成形等の二次成形は、通常、シートを
ヒーター、熱板等で予備加熱し、シートが軟化したとこ
ろで金型に密着固化させ、冷却する方法で行われている
が、開示された上記の方法では、樹脂組成物中のＰＢＴ
系樹脂を結晶化させて得られる容器に耐熱性を持たせて
いるために予備加熱は比較的低温とし、成形時に高温に
加熱しなければならない。However, vacuum, compressed air,
Secondary molding such as vacuum air pressure and press molding is usually carried out by a method of preheating a sheet with a heater, a hot plate, etc., when the sheet is softened, solidified and adhered to a mold, and cooled. In the above method, the PBT in the resin composition is
Since the container obtained by crystallizing the system resin has heat resistance, preheating must be performed at a relatively low temperature and must be performed at a high temperature during molding.

【０００６】しかし、この方法では、従来の真空、圧
空、真空圧空、プレス成形等の二次成形機に設置されて
いる予備加熱ヒーターでは加熱力が強すぎるため、予備
加熱のコントロールが困難である。また、金型に温調機
を取り付けなければならないため多少の改造が必要とな
る。さらに、シートを高温の金型に密着させているた
め、成形後に容器を取り出すときに剥離性が悪く容器が
変形しやすく、また、金型の表面状態（切削加工された
ままのものが多い。）が転写され容器が曇りやすい等の
問題があった。However, in this method, it is difficult to control the preheating because the preheating heater installed in the conventional secondary molding machine for vacuum, compressed air, vacuum compressed air, press molding or the like has too much heating power. .. In addition, since a temperature controller must be attached to the mold, some modification is required. Further, since the sheet is brought into close contact with the high temperature mold, the peeling property is poor when the container is taken out after molding and the container is easily deformed, and the surface state of the mold (in many cases, it remains cut). ) Was transferred and the container was easily fogged.

【０００７】したがって、本発明は上記従来の不利を解
決するもので、耐熱性に優れ、しかも透明性を有する耐
熱容器の製造方法において、容器成形時の容器の変形や
曇り等の不利を解消できるきわめて良好な耐熱容器の製
造方法の提供を課題とする。Therefore, the present invention solves the above-mentioned disadvantages of the prior art, and in a method for producing a heat-resistant container having excellent heat resistance and transparency, the disadvantages such as deformation and fogging of the container at the time of molding the container can be eliminated. An object of the present invention is to provide an extremely good heat-resistant container manufacturing method.

【０００８】[0008]

【課題を解決するための手段】本発明者らは、上記課題
を解決するために鋭意研究を重ねた結果、容器に耐熱性
を持たせるための結晶化を容器成形時の加熱金型ではな
く予備加熱時に行い、冷却金型を用いて成形することに
着目し、その予備加熱および冷却金型での成形を特定の
条件下で行なうことにより問題を解決できることを見出
した。As a result of intensive studies to solve the above problems, the inventors of the present invention have found that crystallization for imparting heat resistance to a container is performed not by a heating mold at the time of molding the container. It was found that the problem can be solved by performing the preheating and molding using a cooling mold, and performing the preheating and the molding with the cooling mold under specific conditions.

【０００９】つまり、本発明者らは、少なくとも１種の
ＰＢＴ系樹脂１０〜１００重量部と少なくとも１種のＰ
ＥＴ系樹脂９０〜０重量部からなる樹脂組成物を成膜し
て得られたシートを容器成形の予備加熱時に、この樹脂
組成物の冷結晶化温度よりも高い温度で、しかもその組
成物を構成する樹脂の融点のうち最も融点の高い樹脂の
融点より低い温度に加熱した後、冷却金型で成形と同時
に冷却すれば、シートは十分伸びて成形可能となり、ま
た予備加熱時にＰＢＴ系樹脂が結晶化されるため耐熱性
を有する容器とすることができ、さらには、この予備加
熱されるシートが共押出しまたはラミネートした積層シ
ートである場合には、積層シートの各層を構成する樹脂
成分の冷結晶化温度と融点と予備加熱温度との関係を検
討し発明を完成させた。具体的には前記特許請求の範囲
の請求項１または請求項２に記載の要件から成る耐熱容
器の製造方法である。That is, the present inventors have found that 10 to 100 parts by weight of at least one PBT resin and at least one P resin.
A sheet obtained by forming a film of a resin composition consisting of 90 to 0 parts by weight of an ET resin is heated at a temperature higher than the cold crystallization temperature of the resin composition at the time of preheating for molding a container, and the composition is After heating to a temperature lower than the melting point of the resin having the highest melting point among the constituent resins, the sheet can be sufficiently stretched to be molded by cooling at the same time as molding with a cooling die, and the PBT resin is Since it is crystallized, it can be made into a heat-resistant container. Furthermore, when the sheet to be preheated is a coextruded or laminated laminated sheet, cooling of the resin component constituting each layer of the laminated sheet is performed. The invention was completed by examining the relationship between the crystallization temperature, the melting point and the preheating temperature. Specifically, it is a method for manufacturing a heat-resistant container, which comprises the requirements of claim 1 or claim 2.

【００１０】ここでいう冷結晶化温度とは、結晶化度の
低いシートをＤＳＣ（示差走査熱量）測定した場合に、
ＤＳＣ曲線に表われたシートが結晶化しはじめる温度を
いい、融点とはＤＳＣ曲線に表われるシートの吸熱ピー
クの温度を言う。The term "cold crystallization temperature" as used herein means that when a sheet having a low crystallinity is measured by DSC (differential scanning calorimetry),
The temperature shown in the DSC curve at which the sheet starts to crystallize, and the melting point means the temperature of the endothermic peak of the sheet shown in the DSC curve.

【００１１】なお、一般に少なくとも一種のＰＥＴ系樹
脂および／または少なくとも一種のＰＢＴ系樹脂をブレ
ンド（ただしＰＥＴ系樹脂のみの場合を除く）すると、
選ばれた樹脂が何種類あろうともブレンド体としての冷
結晶化温度は一つしか表われないが、融点は選ばれた結
晶性樹脂の数だけあらわれる。Generally, when at least one type of PET resin and / or at least one type of PBT resin is blended (excluding the case of only PET type resin),
No matter how many kinds of resins are selected, only one cold crystallization temperature as a blend is represented, but the melting point is represented by the number of selected crystalline resins.

【００１２】以下、本発明を詳細に説明する。本発明に
用いられるＰＢＴ系樹脂とは単独重合体及び共重合体の
ことであり、ＰＥＴ系樹脂とは単独重合体及び共重合体
のことである。このＰＢＴ系樹脂およびＰＥＴ系樹脂の
共重合成分の例示としては表１に示すものなどが挙げら
れる。The present invention will be described in detail below. The PBT-based resin used in the present invention refers to a homopolymer and a copolymer, and the PET-based resin refers to a homopolymer and a copolymer. Examples of the copolymerization component of the PBT resin and the PET resin include those shown in Table 1.

【００１３】[0013]

【表１】 [Table 1]

【００１４】なお、このＰＢＴ系樹脂は、単独重合体と
してジュラネックス６００ＦＰ（ポリプラスチックス社
製商品名）、共重合体としてジュラネックス６００ＪＰ
（同社製商品名）等が例示される。また、ＰＥＴ系樹脂
は、単独重合体としてダイヤナイトＭＡ−５３０Ｈ（三
菱レイヨン社製商品名：結晶性）、共重合体としてＦＦ
Ｓ−３０Ｍ（鐘紡社製商品名：非晶性）等が例示され
る。The PBT resin is a homopolymer of Duranex 600FP (trade name of Polyplastics Co., Ltd.) and a copolymer of Duranex 600JP.
(Product name manufactured by the same company) is exemplified. In addition, the PET-based resin is DIANITE MA-530H (trade name: crystalline) manufactured by Mitsubishi Rayon Co., Ltd. as a homopolymer, and FF as a copolymer.
S-30M (trade name: Kanebo Ltd .: amorphous) and the like are exemplified.

【００１５】本発明において用いられるシートが単層、
すなわち請求項１の場合に用いられる樹脂組成物は、少
なくとも１種のＰＢＴ系樹脂１０〜１００重量部と少な
くとも１種のＰＥＴ系樹脂９０〜０重量部とからなる合
計が１００重量部の配合割合であるが具体的には、
（ａ）１種のＰＢＴ系樹脂１０〜１００重量部と１種の
ＰＥＴ系樹脂９０〜０重量部とからなる合計が１００重
量部、または（ｂ）１種のＰＢＴ系樹脂１〜１００重量
部とこれとは相異なる１種のＰＢＴ系樹脂９９〜０重量
部とからなる合計が１００重量部、または（ｃ）ＰＢＴ
系樹脂とＰＥＴ系樹脂の中から３種類以上を選び、全体
としてＰＢＴ系樹脂１０〜１００重量部とＰＥＴ系樹脂
９０〜０重量部とからなる合計が１００重量部、からな
るものである。本発明において用いられるシートが積層
シートである場合、少なくとも一つの層には少なくとも
１種のＰＢＴ系樹脂が含まれるように選択する必要があ
る。The sheet used in the present invention is a single layer,
That is, the resin composition used in the case of claim 1 is composed of 10 to 100 parts by weight of at least one PBT-based resin and 90 to 0 parts by weight of at least one PET-based resin, and the total mixing ratio is 100 parts by weight. But specifically,
(A) 10 to 100 parts by weight of one PBT resin and 90 to 0 parts by weight of PET resin are 100 parts by weight in total, or (b) 1 to 100 parts by weight of PBT resin. And a total of 100 parts by weight of 99 to 0 parts by weight of one kind of PBT resin different from this, or (c) PBT
A total of 100 parts by weight of 10 to 100 parts by weight of PBT-based resin and 90 to 0 parts by weight of PET-based resin is selected as a total, and three or more kinds are selected from the system-based resin and the PET-based resin. When the sheet used in the present invention is a laminated sheet, it is necessary to select such that at least one layer contains at least one PBT resin.

【００１６】上記の配合割合で、ＰＢＴ系樹脂が１０重
量部未満、ＰＥＴ系樹脂が９０重量部より多い場合、予
備加熱時に結晶化させると容器が不透明になり、また結
晶化速度が遅すぎるため、予備加熱では成形後の耐熱性
を持たせることが難しくなるので好ましくない。また、
非晶性の樹脂を用いる場合、配合中の非晶性樹脂の割合
は７０重量部以下が望ましく、７０重量部より多くなる
と結晶化速度が遅すぎるため予備加熱では成形後の耐熱
性を持たせることが難しくなるので好ましくない。さら
に、ＰＢＴ系樹脂の中でも比較的結晶化速度の速いもの
を用いる場合、配合中のその割合が多くなると、容器成
形時に予備加熱した後に樹脂組成物の非結晶部分が少な
くなり、シートまたはパリソンを伸ばすことが困難とな
る。When the PBT resin is less than 10 parts by weight and the PET resin is more than 90 parts by weight in the above blending ratio, the container becomes opaque when crystallized during preheating, and the crystallization speed is too slow. However, preheating is not preferable because it becomes difficult to provide heat resistance after molding. Also,
When an amorphous resin is used, the proportion of the amorphous resin in the compound is preferably 70 parts by weight or less, and when it exceeds 70 parts by weight, the crystallization rate is too slow, and thus preheating provides heat resistance after molding. This is not preferable because it becomes difficult. Furthermore, in the case of using a PBT-based resin having a relatively high crystallization rate, if the proportion thereof in the compounding is large, the non-crystalline portion of the resin composition is reduced after preheating at the time of molding the container, and the sheet or parison is formed. It becomes difficult to stretch.

【００１７】本発明に用いられる上記の樹脂組成物は、
容器成形に先立ってシート状に成膜されるが、この時急
冷され結晶化度の低い透明な状態で固化される。これ
は、例えば押出機によって溶融押出しされ、冷却ロール
で冷却されシート状に成膜されるか、ブロー成形でパリ
ソンにすればよい。このように成形されたシートまたは
パリソンは、真空、圧空、真空圧空、プレス、ブロー成
形により容器とされるが、このシート、パリソンの厚さ
は成形される容器の形状または構造に応じて異なるが、
通常０．１〜５．０ｍｍ、好ましくは０．２〜３．０ｍ
ｍの範囲である。The above resin composition used in the present invention is
A film is formed into a sheet prior to forming the container, but at this time it is rapidly cooled and solidified in a transparent state with low crystallinity. This may be melt-extruded by, for example, an extruder, cooled by a cooling roll to form a film in a sheet, or blow molded into a parison. The sheet or parison formed in this way is formed into a container by vacuum, compressed air, vacuum compressed air, press, or blow molding. Although the thickness of this sheet or parison varies depending on the shape or structure of the container to be formed, ,
Usually 0.1 to 5.0 mm, preferably 0.2 to 3.0 m
The range is m.

【００１８】本発明において、上記のように成形された
シートまたはパリソンは、十分に結晶化させ耐熱性を得
るために、かつシートまたはパリソンがこの直後に容器
成形されるに十分な伸びを得るために、前記樹脂組成物
の冷結晶化温度よりも高い温度で樹脂組成物中の樹脂の
うち最も融点の高い樹脂の温度よりも低い温度で予備加
熱した後、真空、圧空、真空圧空、プレス成形またはブ
ロー成形等により成形し、冷却金型によって成形と同時
に冷却する。In the present invention, the sheet or parison formed as described above is sufficiently crystallized to obtain heat resistance, and in order to obtain sufficient elongation for the sheet or parison to be molded into a container immediately after this. In addition, after preheating at a temperature higher than the cold crystallization temperature of the resin composition and lower than the temperature of the resin having the highest melting point among the resins in the resin composition, vacuum, compressed air, vacuum compressed air, press molding Alternatively, it is molded by blow molding or the like and cooled at the same time as molding by a cooling mold.

【００１９】なお、本発明で冷結晶化温度は、その樹脂
の組成によっても異なるが、通常４０〜１２０℃の範囲
で成形される。The cold crystallization temperature in the present invention is usually in the range of 40 to 120 ° C., although it depends on the composition of the resin.

【００２０】上記シートまたはパリソンの予備加熱時に
樹脂組成物の冷結晶化温度よりも低い温度に加熱した
後、容器成形を行うと、その容器は耐熱性のないものと
なり好ましくなく、使用する樹脂のうち最も融点の高い
樹脂の融点（樹脂によって異なるが、通常１７０〜２６
０℃の範囲）以上の温度に加熱すると、シートまたはパ
リソンが溶融してしまうので好ましくない。When the above-mentioned sheet or parison is preheated, it is heated to a temperature lower than the cold crystallization temperature of the resin composition and then molded into a container. Of these, the melting point of the resin with the highest melting point (depending on the resin, usually 170-26
Heating to a temperature of 0 ° C. or higher) is not preferable because the sheet or parison is melted.

【００２１】また、配合樹脂中のＰＥＴ系樹脂の割合が
多い場合またはＰＢＴ系樹脂として結晶化速度の遅いも
のを使用した場合には、容器成形の予備加熱時に白化し
てしまうので、冷却ロールでの冷却をシートが透明性を
失わない程度の徐冷にするか、あるいはシートに成膜し
た後にアニール（一定の温度に加熱して一定時間放置す
ること）を行う必要がある。If the proportion of the PET resin in the blended resin is high or if the PBT resin having a slow crystallization rate is used, whitening occurs during preheating of the container molding, so that the cooling roll is used. It is necessary to gradually cool the sheet so as not to lose the transparency of the sheet, or to perform annealing (heating to a certain temperature and standing for a certain time) after forming a film on the sheet.

【００２２】この徐冷の条件としては、冷却ロールの温
度を、使用する樹脂の中で最もガラス転移点の低い樹脂
のガラス転移点以上で、かつ７０℃以下の温度になるよ
うに調節しシート状に成膜すればよい。冷却ロールの温
度を使用する樹脂の中で最もガラス転移点の低い樹脂の
ガラス転移点よりも低い温度にすると、容器成形の予備
加熱時の白化抑制の効果が現れず、また７０℃よりも高
い温度にすると、シートまたはパリソンの冷却が不完全
となり搬送または取り出し時に支障をきたすので好まし
くない。As conditions for this slow cooling, the temperature of the cooling roll is adjusted so that the temperature is not lower than the glass transition point of the resin having the lowest glass transition point among the resins used and not higher than 70 ° C. It may be formed into a film. If the temperature of the cooling roll is lower than the glass transition point of the resin having the lowest glass transition point among the resins used, the effect of suppressing whitening during preheating of container molding does not appear and it is higher than 70 ° C. If the temperature is raised, cooling of the sheet or parison becomes incomplete, which causes troubles during transportation or removal, which is not preferable.

【００２３】アニールを行なう場合には、シート状に成
膜する際の装置のライン上でロール、ベルト、乾燥炉等
により行ってもよいし、オーブン等の乾燥機を用いて行
ってもよい。このときの条件はロール、オーブン等の温
度を、使用する樹脂の中で最もガラス転移点の低い樹脂
のガラス転移点以上で、かつ、使用する樹脂の中で最も
ガラス転移点の高い樹脂のガラス転移点よりも低い温度
（ＰＢＴ系樹脂１種類の場合、そのガラス転移点以上
で、かつ冷結晶化温度よりも低い温度）で行えばよく、
乾燥機等で行なう場合、その時間は１分〜５００時間と
される。この時間が１分より短いとアニールの効果は現
れず、５００時間より長いと長すぎて不利となるので好
ましくない。When annealing is carried out, it may be carried out by a roll, a belt, a drying oven or the like on the line of the apparatus for forming a film in the form of a sheet, or by using a dryer such as an oven. The conditions at this time are such that the temperature of rolls, ovens, etc. is equal to or higher than the glass transition point of the resin having the lowest glass transition point among the resins used, and the glass of the resin having the highest glass transition point among the resins used. The temperature may be lower than the transition point (in the case of one type of PBT resin, the glass transition point or higher and the temperature lower than the cold crystallization temperature).
When using a dryer or the like, the time is from 1 minute to 500 hours. If this time is shorter than 1 minute, the effect of annealing does not appear, and if it is longer than 500 hours, it is too long and disadvantageous.

【００２４】[0024]

【作用】本発明の方法では、ＰＢＴ系樹脂を用いるため
透明性および耐熱性を有するものとなり、その耐熱性を
得るための加熱を容器成形時の加熱金型ではなく予備加
熱時に行い、そして冷却金型を用いて成形することか
ら、通常の成形機を改造せずに使用でき、しかも剥離等
の問題が起こらず安定した成形で耐熱容器を製造するこ
とができる。In the method of the present invention, since the PBT resin is used, the resin has transparency and heat resistance. To obtain the heat resistance, heating is performed not in the heating die for molding the container but in preheating, and then cooling. Since the molding is performed using the mold, the molding machine can be used without modification of an ordinary molding machine, and the heat-resistant container can be manufactured with stable molding without causing problems such as peeling.

【００２５】[0025]

【実施例】【Example】

実施例１ ＰＢＴ（ポリプラスチックス社製商品名：ジュラネック
ス６００ＦＰ）とＰＥＴ（三菱レイヨン社製商品名：ダ
イヤナイトＭＡ−５３０Ｈ）との配合割合を色々変えて
４０ｍｍφの二軸押出機に供給し、６５０ｍｍ巾のＴダ
イを取り付け、冷却ロールの温度を１０℃に調節して厚
さ０．２〜１．０ｍｍの範囲の種々のシートに成膜し、
得られたシートの透明性を調べた。次に透明なシートに
ついては、予備加熱シート温度を変えて冷却金型内で２
０℃の温度で真空成形を行い容器に成形した。得られた
容器の透明性と１４０℃のオーブンに３０分間放置し耐
熱性を調べたところ、表２に示すような結果となった。
なお、表２中の評価は、次のとおりである。 シートの透明性 ・・・〇：有 ×：無 真空成形性 ・・・〇：可 ×：不可 容器の１４０℃耐熱性・・・〇：良い ×：悪い 容器の透明性 ・・・〇：透明 △：半透明
×：不透明Example 1 PBT (Product name: Duranex 600FP manufactured by Polyplastics Co., Ltd.) and PET (Product name: Diamond Knight MA-530H manufactured by Mitsubishi Rayon Co., Ltd.) were variously mixed and supplied to a 40 mmφ twin-screw extruder. , A T-die with a width of 650 mm was attached, the temperature of the cooling roll was adjusted to 10 ° C., and a film was formed on various sheets with a thickness of 0.2 to 1.0 mm,
The transparency of the obtained sheet was examined. Next, for the transparent sheet, change the preheating sheet temperature to
Vacuum forming was performed at a temperature of 0 ° C. to form a container. When the transparency of the obtained container and the heat resistance were examined by leaving it in an oven at 140 ° C. for 30 minutes, the results shown in Table 2 were obtained.
The evaluations in Table 2 are as follows. Transparency of sheet ・ ・ ・ ◯: Yes ×: No Vacuum formability ・ ・ ・ 〇: Yes ×: No Heat resistance of container at 140 ° C ・ ・ ・ ◯: Good ×: Poor Container transparency ・ ・ ・ ○: Transparent △: translucent
×: opaque

【００２６】[0026]

【表２】 [Table 2]

【００２７】実施例２ ＰＢＴ（ポリプラスチックス社製商品名：ジュラネック
ス６００ＦＰ）５０重量部と非晶性ＰＥＴ（鐘紡社製商
品名：ＦＦＳ−３０Ｍ）５０重量部とからなる樹脂組成
物を４０ｍｍφの二軸押出機に供給し、６５０ｍｍ巾の
Ｔダイを取り付け、冷却ロールの温度を１０℃に調節し
て厚さ０．５ｍｍのシートに成膜した。次に、このシー
トをオーブンの温度を色々変えて２４時間アニールを行
った後、１７０℃に予備加熱して冷却金型内で２０℃の
温度で真空成形を行い容器に成形した。得られた容器の
透明性と１２０℃のオーブンに３０分間放置し耐熱性を
調べたところ、表３に示すような結果となった。なお、
表３中の評価は、次のとおりである。 容器の１２０℃耐熱性・・・〇：良い ×：悪い 容器の透明性 ・・・〇：透明 ×：不透明Example 2 40 mmφ of a resin composition comprising 50 parts by weight of PBT (trade name: Duranex 600FP manufactured by Polyplastics Co., Ltd.) and 50 parts by weight of amorphous PET (trade name: FFS-30M manufactured by Kanebo Co., Ltd.) Was supplied to a twin-screw extruder, and a 650 mm wide T die was attached, the temperature of the cooling roll was adjusted to 10 ° C., and a film having a thickness of 0.5 mm was formed. Next, this sheet was annealed for 24 hours at various oven temperatures, preheated to 170 ° C., and vacuum molded at a temperature of 20 ° C. in a cooling mold to form a container. When the transparency of the obtained container and the heat resistance were examined by leaving it in an oven at 120 ° C. for 30 minutes, the results shown in Table 3 were obtained. In addition,
The evaluations in Table 3 are as follows. 120 ° C heat resistance of container ・ ・ ・ ○: Good ×: Poor Transparency of container ・ ・ ・ ○: Transparent ×: Opaque

【００２８】[0028]

【表３】 [Table 3]

【００２９】実施例３ ＰＢＴ（ポリプラスチックス社製商品名：ジュラネック
ス６００ＦＰ）６０重量部と非晶性ＰＥＴ（鐘紡社製商
品名：ＦＦＳ−３０Ｍ）４０重量部とからなる樹脂組成
物を４０ｍｍφの二軸押出機に供給し、６５０ｍｍ巾の
Ｔダイを取り付け、冷却ロールの温度を５０℃に調節し
て厚さ０．５ｍｍのシートに成膜した。次に、このシー
トを１８０℃に予備加熱して冷却金型内で２０℃の温度
で真空成形を行い容器に成形した。得られた容器の透明
性と１２０℃のオーブンに３０分間放置し耐熱性を調べ
たところ、透明性、耐熱性とも優れたものであった。比
較のため、冷却ロールの温度を２０℃に調節してシート
状に成膜した他は上記と同じように容器を成形し、得ら
れた容器の透明性と耐熱性を調べたところ、耐熱性は優
れているが透明性の悪いものであった。Example 3 A resin composition consisting of 60 parts by weight of PBT (product name: Polylanes Co., Ltd .: Duranex 600FP) and 40 parts by weight of amorphous PET (product name: Kanebo Co., Ltd .: FFS-30M) is 40 mmφ. Was supplied to a twin-screw extruder, and a T die having a width of 650 mm was attached, the temperature of the cooling roll was adjusted to 50 ° C., and a film having a thickness of 0.5 mm was formed. Next, this sheet was preheated to 180 ° C. and vacuum formed at a temperature of 20 ° C. in a cooling mold to form a container. When the transparency of the obtained container and the heat resistance thereof were examined by leaving it in an oven at 120 ° C. for 30 minutes, both the transparency and the heat resistance were excellent. For comparison, a container was formed in the same manner as above except that the temperature of the cooling roll was adjusted to 20 ° C. and a film was formed into a sheet, and the transparency and heat resistance of the obtained container were examined. Was excellent but poorly transparent.

【００３０】実施例４ 各３０ｍｍφ、４０ｍｍφ、５０ｍｍφの単軸の押出機
に２５０ｍｍ巾の２種３層マルチマニホールドダイを取
付けて共押出しを行い、ＰＢＴ共重合品（ポリプラスチ
ックス社製商品名：ジュラネックス６００ＬＰ）とＰＥ
Ｔ（三菱レイヨン社製商品名：ダイヤナイトＭＡ−５３
０Ｈ）との厚みの構成比をＰＢＴ共重合品／ＰＥＴ／Ｐ
ＢＴ共重合品＝１／４／１とし、冷却ロールの温度を１
０℃に調節して総厚み０．５ｍｍのシートに成膜した。
次に、このシートを４０℃のオープン中で２４時間アニ
ールを行った後、１４０℃に予備加熱して冷却金型内で
２０℃の温度で真空成形を行い容器に成形した。得られ
た容器の透明性と１２０℃のオーブンに３０分間放置し
て耐熱性を調べたところ、透明性、耐熱性も優れたもの
であった。Example 4 PBT copolymerized product (trade name of Polyplastics Co .: trade name: manufactured by Polyplastics Co., Ltd.) was prepared by attaching a 250 mm wide two-kind three-layer multi-manifold die to a single-screw extruder of 30 mmφ, 40 mmφ, and 50 mmφ. DURANEX 600LP) and PE
T (trade name of Mitsubishi Rayon Co., Ltd .: Diamond Night MA-53)
0H) and the compositional ratio of thickness to PBT copolymer / PET / P
BT copolymer product = 1/4/1, cooling roll temperature 1
The temperature was adjusted to 0 ° C. and a film having a total thickness of 0.5 mm was formed into a film.
Next, this sheet was annealed in an open at 40 ° C. for 24 hours, then preheated to 140 ° C. and vacuum formed at a temperature of 20 ° C. in a cooling mold to form a container. When the transparency of the obtained container and the heat resistance thereof were examined by leaving it in an oven at 120 ° C. for 30 minutes, the transparency and heat resistance were also excellent.

【００３１】実施例５ ＰＢＴ（ポリプラスチックス社製商品名：ジュラネック
ス６００ＦＰ）５０重量部と非晶性ＰＥＴ（鐘紡社製商
品名：ＦＦＳ−３０Ｍ）５０重量部とからなる樹脂組成
物を４０ｍｍφの二軸押出機に供給し、ペレタイザーを
取り付けてコンパウンド化し、これをコールドパリソン
法のブロー成形機に供給しパリソンを成形した。次に、
このパリソンを５０℃のオーブン中で２４時間アニール
した後、再びブロー成形機により１７０℃に予備加熱し
て冷却金型内で２０℃の温度でブロー成形を行い容器に
成形した。得られた容器の透明性と１２０℃のオーブン
に３０分間放置して耐熱性を調べたところ、透明性、耐
熱性とも優れたものであった。Example 5 40 mmφ of a resin composition consisting of 50 parts by weight of PBT (trade name: Duranex 600FP manufactured by Polyplastics Co., Ltd.) and 50 parts by weight of amorphous PET (trade name: FFS-30M manufactured by Kanebo Co., Ltd.) Was supplied to the twin-screw extruder of No. 2, and was made into a compound by attaching a pelletizer, and this was supplied to the blow molding machine of the cold parison method to mold the parison. next,
After annealing this parison in an oven at 50 ° C. for 24 hours, it was preheated again to 170 ° C. by a blow molding machine and blow-molded at a temperature of 20 ° C. in a cooling mold to form a container. When the transparency of the obtained container and the heat resistance thereof after being left in an oven at 120 ° C. for 30 minutes were examined, both the transparency and the heat resistance were excellent.

【００３２】[0032]

【発明の効果】本発明の耐熱容器の製造方法によれば、
耐熱性の優れたＰＢＴ系樹脂を使用してＰＥＴ系樹脂と
特定の混合割合の樹脂組成物にし、その結晶性をコント
ロールすることにより容器成形性を向上させ、さらに透
明性および耐熱性を持たせることができる。また、耐熱
性を得る方法として、従来の容器成形時の加熱金型では
なく予備加熱によって行うため、通常の成形機を使用す
ることができ、剥離等の問題なく安定して容器を製造す
ることができる。According to the method for manufacturing a heat-resistant container of the present invention,
A resin composition with a specific mixing ratio with a PET resin is prepared by using a PBT resin having excellent heat resistance, and the crystallinity of the resin composition is controlled to improve the moldability of a container, and further impart transparency and heat resistance. be able to. Further, as a method for obtaining heat resistance, since it is carried out by preheating instead of the conventional heating mold at the time of molding a container, an ordinary molding machine can be used, and a container can be stably manufactured without problems such as peeling. You can

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ２９Ｃ 51/10 51/42 7421−4Ｆ Ｃ０８Ｊ 5/00 ＣＦＤ Ｃ０８Ｌ 67/00 ＬＰＤ 8933−4Ｊ 67/02 ＬＰＤ 8933−4Ｊ // Ｂ２９Ｋ 67:00 Ｂ２９Ｌ 22:00 4Ｆ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Internal reference number FI Technical display location B29C 51/10 51/42 7421-4F C08J 5/00 CFD C08L 67/00 LPD 8933-4J 67 / 02 LPD 8933-4J // B29K 67:00 B29L 22:00 4F

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】少なくとも１種のポリブチレンテレフタレ
ート系樹脂１０〜１００重量部と少なくとも１種のポリ
エチレンテレフタレート系樹脂９０〜０重量部からなる
樹脂組成物を成膜して、得られたシートを前記樹脂組成
物の冷結晶化温度よりも高い温度で、かつ、前記組成物
を構成する樹脂の融点のうち最も融点の高い樹脂の温度
よりも低い温度で予備加熱し、ついで冷却金型内で成形
することを特徴とする耐熱容器の製造方法。1. A resin composition comprising 10 to 100 parts by weight of at least one polybutylene terephthalate resin and 90 to 0 parts by weight of at least one polyethylene terephthalate resin is formed into a film, and the obtained sheet is obtained as described above. Preheating at a temperature higher than the cold crystallization temperature of the resin composition and lower than the temperature of the resin having the highest melting point among the melting points of the resin constituting the composition, and then molding in a cooling mold A method for manufacturing a heat-resistant container, comprising: 【請求項２】ポリブチレンテレフタレート系樹脂、ポリ
エチレンテレフタレート系樹脂、および少なくとも１種
のポリブチレンテレフタレート系樹脂１０〜１００重量
部と少なくとも１種のポリエチレンテレフタレート系樹
脂９０〜０重量部からなる樹脂組成物から選択される少
なくとも２種を共押出しまたはラミネートした積層シー
ト（ただしポリエチレンテレフタレート系樹脂組成物の
みの構成を除く）を前記積層シートを構成する層のうち
最も低い冷結晶化温度を有する層の冷結晶化温度よりも
高い温度で、かつ、最も融点の低い層の融点（層が二種
以上の樹脂からなる場合、これらの樹脂のうち最も融点
の高い樹脂の融点をその層の融点とする）よりも低い温
度で予備加熱し、ついで冷却金型内で成形することを特
徴とする耐熱容器の製造方法。2. A polybutylene terephthalate resin, a polyethylene terephthalate resin, and a resin composition comprising 10 to 100 parts by weight of at least one polybutylene terephthalate resin and 90 to 0 parts by weight of at least one polyethylene terephthalate resin. A laminated sheet obtained by co-extruding or laminating at least two kinds selected from the following (excluding the constitution of only the polyethylene terephthalate resin composition) is used to cool the layer having the lowest cold crystallization temperature among the layers constituting the laminated sheet. The melting point of the layer with the lowest melting point at a temperature higher than the crystallization temperature (if the layer consists of two or more resins, the melting point of the resin with the highest melting point among these resins is the melting point of the layer) Heat-resistant container characterized by being preheated at a lower temperature and then molded in a cooling mold Manufacturing method.
JP13604492A 1992-04-28 1992-04-28 Production of heat-resistant container Pending JPH05305680A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13604492A JPH05305680A (en) 1992-04-28 1992-04-28 Production of heat-resistant container

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13604492A JPH05305680A (en) 1992-04-28 1992-04-28 Production of heat-resistant container

Publications (1)

Publication Number Publication Date
JPH05305680A true JPH05305680A (en) 1993-11-19

Family

ID=15165867

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13604492A Pending JPH05305680A (en) 1992-04-28 1992-04-28 Production of heat-resistant container

Country Status (1)

Country Link
JP (1) JPH05305680A (en)

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