JPS6125818A - Molding method of sheet container made of synthetic resin - Google Patents
Molding method of sheet container made of synthetic resinInfo
- Publication number
- JPS6125818A JPS6125818A JP14727284A JP14727284A JPS6125818A JP S6125818 A JPS6125818 A JP S6125818A JP 14727284 A JP14727284 A JP 14727284A JP 14727284 A JP14727284 A JP 14727284A JP S6125818 A JPS6125818 A JP S6125818A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- temperature
- molded article
- primary
- container
- 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.)
- Granted
Links
- 238000000465 moulding Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 6
- 229920003002 synthetic resin Polymers 0.000 title claims description 6
- 239000000057 synthetic resin Substances 0.000 title claims description 6
- 239000000463 material Substances 0.000 claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 238000002425 crystallisation Methods 0.000 claims abstract description 5
- 230000008025 crystallization Effects 0.000 claims abstract description 5
- -1 polyethylene Polymers 0.000 claims abstract description 3
- 229920005989 resin Polymers 0.000 claims abstract description 3
- 239000011347 resin Substances 0.000 claims abstract description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 7
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 7
- 238000007666 vacuum forming Methods 0.000 claims description 4
- 229920001169 thermoplastic Polymers 0.000 claims 1
- 239000004416 thermosoftening plastic Substances 0.000 claims 1
- 239000004698 Polyethylene Substances 0.000 abstract 1
- 238000012423 maintenance Methods 0.000 abstract 1
- 229920000573 polyethylene Polymers 0.000 abstract 1
- KKEYFWRCBNTPAC-UHFFFAOYSA-L terephthalate(2-) Chemical compound [O-]C(=O)C1=CC=C(C([O-])=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-L 0.000 abstract 1
- 235000013305 food Nutrition 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 241000722946 Acanthocybium solandri Species 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000002087 whitening effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/42—Heating or cooling
- B29C51/426—Producing specific thermal regimes during thermoforming to obtain particular properties
-
- 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
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0012—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular thermal properties
- B29K2995/0017—Heat stable
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Containers Having Bodies Formed In One Piece (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野および目的〕
本発明は、合成樹脂製シート容器の成形方法に関するも
のであって、耐熱性の高いシート容器を得ることを目的
とする。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application and Purpose] The present invention relates to a method for molding a synthetic resin sheet container, and an object thereof is to obtain a sheet container with high heat resistance.
ポリエチレンテレフタレート樹脂（以下単にＰＥＴと記
す）は、安定した物性、無公害性、優れた透明性、そし
て高い機械的強度等よりして、延伸プロー成形容器の材
料として各方面で多岐に使用されており、特に食品用の
容器には極めて有用なものとなっている。Polyethylene terephthalate resin (hereinafter simply referred to as PET) is used in a wide variety of fields as a material for stretch blow molded containers due to its stable physical properties, non-pollution, excellent transparency, and high mechanical strength. This makes it extremely useful, especially for food containers.
このようにＰＥＴ製容器は、多くの優れた特性を効果的
に発揮するものではあるけれども、熱処理を施していな
い容器は熱に対して弱（，７０℃以上の高温度化では著
しく変形する。As described above, although PET containers effectively exhibit many excellent properties, containers that have not been heat-treated are weak against heat (and are significantly deformed at high temperatures of 70° C. or higher).
それゆえに例えば、１２０℃の条件下で３０分間放置し
て熱処理するレトルト食品とか、その他熱処理される食
品の収納容器としては利用することができず、耐熱性の
高いＰＥＴ製容器の出現が望まれていたのである。Therefore, for example, it cannot be used as a storage container for retort foods that are heat-treated by leaving them at 120°C for 30 minutes, or other heat-treated foods, and the emergence of highly heat-resistant PET containers is desired. It was.
本発明は、上記した従来からの要望を満すべく創案され
たもので、ＰＥＴ製シート素材を真空成形等により一次
中間成形品に一次成形し、この一次中間成形品を加熱処
理して熱収縮変形させて二次中間成形品に成形し、さら
にこの二次中間成形品を製品である容器に延伸二次成形
するものである。 以下、本発明の一実施例を図面を参
照しながら説明する。The present invention was devised to meet the above-mentioned conventional demands, and involves first forming a PET sheet material into a primary intermediate molded product by vacuum forming, etc., and heat-treating this primary intermediate molded product to shrink it. It is deformed and molded into a secondary intermediate molded product, and this secondary intermediate molded product is then stretched and secondary molded into a container as a product. An embodiment of the present invention will be described below with reference to the drawings.
〔作用〕および〔実施例〕
まず合成樹脂製シート素材１は、ＰＥＴ製或いはＰＥＴ
と他の合成樹脂とによる積層構造であって、このシート
素材ｌを所定形状の一次金型２に装着して真空成形等に
より一次中間成形品３に一次成形する（第１図、第２図
参照）。[Function] and [Example] First, the synthetic resin sheet material 1 is made of PET or
This sheet material 1 is mounted on a primary mold 2 of a predetermined shape and is formed into a primary intermediate molded product 3 by vacuum forming or the like (Figs. 1 and 2). reference).
上記シート素材１は、材料であるところのＰＥＴＯ熱結
晶化温度よりも低いが、この温度に近い温度、すなわち
白化しない程度の温度に加熱されてあり（例えば１００
〜１２０℃）、また−次金型２は、後述する二次成形時
の加熱によって熱結晶化しない状態で延伸成形ができる
ように例えば１４０〜２３０℃に加熱した型温に設定さ
れており、この条件下で上記−火成形が達成される。The sheet material 1 is heated to a temperature that is lower than the thermal crystallization temperature of PETO, which is the material, but close to this temperature, that is, to a temperature that does not cause whitening (for example, 100%
~120°C), and the secondary mold 2 is set at a mold temperature heated to, for example, 140 to 230°C so that stretch molding can be performed without thermal crystallization due to heating during secondary forming, which will be described later. Under these conditions the above-mentioned fireforming is achieved.
この−火成形工程における、前記二次成形時の加熱によ
って熱結晶化しない状態で延伸成形ができるようにする
具体的な手段としては、一次中間成形品３の延伸された
部分が配向結晶していることは当然であるが、その密度
が１．３６以上となるように、シート素材１から一次中
間成形品３への延伸倍率を、面積倍率で５〜１０倍に設
定するのが良い。In this fire-forming step, as a specific means to enable stretch-forming without being thermally crystallized by heating during the secondary forming, the stretched portion of the primary intermediate molded product 3 is oriented to crystallize. Of course, the stretching magnification from the sheet material 1 to the primary intermediate molded product 3 is preferably set to 5 to 10 times in area magnification so that the density becomes 1.36 or more.
次に前記−次成形品３を、熱処理を施して熱収縮させる
（第３図）。Next, the second molded product 3 is subjected to heat treatment to cause it to shrink (FIG. 3).
図中４は、所定形状のコア金型であて、このコア金型４
に一次中間成形品３を装着し、熱収縮により二次中間成
形品５に成形するのであるが、一次中間成形品３はシー
ト素材１を延伸して成形したものであるから、熱処理に
よって形状が崩れてしまうおそれがあり、加熱後の形状
維持をコア金型４をもって達成し、かつ二次中間成形品
５の形状を付与するのである。4 in the figure is a core mold of a predetermined shape, and this core mold 4
The primary intermediate molded product 3 is attached to the holder, and is formed into the secondary intermediate molded product 5 by heat shrinkage.Since the primary intermediate molded product 3 is formed by stretching the sheet material 1, the shape is changed by heat treatment. There is a risk that the core mold 4 will maintain its shape after heating, and the shape of the secondary intermediate molded product 5 will be given.
上記熱処理は、延伸成形された一次中間成形品３内に生
じる残留歪を消滅させるために行なう。The above heat treatment is performed in order to eliminate residual strain generated in the primary intermediate molded product 3 that has been stretch-molded.
すなわち一次中間成形品３を前記−次金型２の型温より
も２０〜６０℃高い温度である２００〜２３５℃に加熱
することによって、この−次金型２を使用して延伸成形
された一次中間成形品３の各延伸成形部分内に発生して
いる内部残留応力に従って、この一次中間成形品３の各
延伸成形部分を自由に変形させ、もって前記した残留歪
を消滅させるのである。That is, by heating the primary intermediate molded product 3 to a temperature of 200 to 235°C, which is 20 to 60°C higher than the mold temperature of the secondary mold 2, the primary intermediate molded product 3 is stretch-molded using this secondary mold 2. Each stretch-formed portion of the primary intermediate molded product 3 is freely deformed according to the internal residual stress generated in each stretch-formed portion of the primary intermediate molded product 3, thereby eliminating the residual strain described above.
この一次中間成形品３の各延伸成形部分内に発生してい
る内部残留応力に従った変形は、当然のことながら収縮
変形となるが、この収縮変形により成形された二次中間
成形品５の延伸成形部分が、成形目的物である製品たる
容器７とほぼ同一かわずかに小さい大きさになるように
、シート素材１から一次中間成形品３への延伸成形の倍
率、および一次中間成形品３とコア金型４の寸法が設定
されている。Deformation according to the internal residual stress occurring in each stretch-molded part of this primary intermediate molded product 3 naturally results in shrinkage deformation, but the secondary intermediate molded product 5 formed by this shrinkage deformation The magnification of the stretch molding from the sheet material 1 to the primary intermediate molded product 3 and the primary intermediate molded product 3 are adjusted so that the stretch molded part has a size that is approximately the same as or slightly smaller than the container 7, which is the product to be molded. and the dimensions of the core mold 4 are set.
次いで上述の熱処理により熱収縮した二次中間成形品５
を二次金型６を介して、真空成形等により再度延伸し、
二次成形することによって、製品たる容器７を得るので
ある（第４図参照）。Next, the secondary intermediate molded product 5 was heat-shrinked by the above-mentioned heat treatment.
is stretched again by vacuum forming etc. through the secondary mold 6,
By performing secondary molding, a container 7 as a product is obtained (see FIG. 4).
上記二次成形時における二次金型６の型温は、容器７が
使用される使用雰囲気温度よりも数置高い温度である１
２５〜１５０℃程度であり、使用雰囲気温度とは、容器
７内に前述した如く熱処理を施した内容物を充填する際
の温度である。The mold temperature of the secondary mold 6 during the above secondary molding is several orders of magnitude higher than the temperature of the atmosphere in which the container 7 is used.
The temperature is approximately 25 to 150° C., and the working atmosphere temperature is the temperature at which the container 7 is filled with the contents that have been heat treated as described above.
上記温度に設定することによって、容器７は二次金型６
を介してヒートセットされることになり、もって残留歪
のないかつ耐熱性の高い容器７を得ることができる。By setting the temperature above, the container 7 is molded into the secondary mold 6.
As a result, a container 7 with no residual strain and high heat resistance can be obtained.
また、容器７を成形する前記二次金型６は、容器７が前
記一次中間成形品３よりも大きくならない範囲に設定さ
れてあり、それゆえに二次中間成形品５から容器７への
延伸成形時における延伸量は極めて少なく、従って二次
中間成形品５から容器７への延伸成形によって、成形さ
れた容器７の延伸成形部分には、はとんど延伸成形によ
る歪を発生させることはない。Further, the secondary mold 6 for molding the container 7 is set in a range in which the container 7 does not become larger than the primary intermediate molded product 3, and therefore the stretch molding from the secondary intermediate molded product 5 to the container 7 is performed. The amount of stretching at the time is extremely small, therefore, stretching from the secondary intermediate molded product 5 to the container 7 hardly causes distortion in the stretch-formed portion of the molded container 7. .
以上の説明から明らかなように、本発明による合成樹脂
製シート容器の成形方法によれば、残留歪のない極めて
耐熱性の高い容器を成形することができ、またその耐熱
温度値を従来のものに比べてはるかに大きな値にするこ
とができ、一次中間成形品をコア金型に装着して熱収縮
させるのでシート素材を用いるにもかわらず、型層れす
ることがなく、さらに従来の加熱手段と延伸成形手段と
を組合わせて実施することができるので、その実施が容
易である等、多くの優れた効果を発揮するものである。As is clear from the above explanation, according to the method for molding a synthetic resin sheet container according to the present invention, a container with extremely high heat resistance without residual strain can be molded, and its heat resistance temperature value is lower than that of conventional Since the primary intermediate molded product is attached to the core mold and heat-shrinked, there is no mold layering even though sheet material is used, and there is no need for conventional heating. Since it can be carried out in combination with the stretching and forming means, it is easy to carry out and exhibits many excellent effects.
第１図、第２図、第３図、第４図は本発明の一実施例を
示す成形工程の断面図である。
符号の説明
１；シート素材、２；−次金型、３；一次中間成形品、
４：コア金型、５：二次中間成形品、６；二次金型、７
：容器。FIG. 1, FIG. 2, FIG. 3, and FIG. 4 are cross-sectional views of a molding process showing an embodiment of the present invention. Explanation of symbols 1; sheet material, 2; secondary mold, 3; primary intermediate molded product,
4: Core mold, 5: Secondary intermediate molded product, 6; Secondary mold, 7
:container.
Claims (1)
レート樹脂等の熱可塑性合成樹脂製シート素材を、該シ
ート素材が二次成形時の加熱によって熱結晶化しない程
度の温度に設定された一次金型を使用して、真空成形等
により一次中間成形品に一次成形し、該一次中間成形品
を、所定のコア金型に装着した状態で、前記一次成形時
の金型温度よりも高い温度で加熱収縮させて二次中間成
形品に成形し、さらに該二次中間成形品を、製品となっ
て使用される際の使用雰囲気温度よりも高い温度に設定
された二次金型を使用して、前記一次中間成形品よりも
大きくならない範囲で真空成形等によってシート容器に
延伸二次成形する合成樹脂製シート容器の成形方法。A sheet material made of thermoplastic synthetic resin such as polyethylene terephthalate resin that has been heated to a temperature on the verge of thermal crystallization is placed in a primary mold set at a temperature that does not cause the sheet material to thermally crystallize due to heating during secondary molding. The primary intermediate molded product is then heated and shrunk at a temperature higher than the mold temperature during the primary molding, with the primary intermediate molded product attached to a predetermined core mold. The secondary intermediate molded product is then molded into a secondary intermediate molded product using a secondary mold set at a temperature higher than the operating atmosphere temperature when used as a product. A method for forming a synthetic resin sheet container by stretching and secondary forming the sheet container by vacuum forming or the like to the extent that the container does not become larger than the primary intermediate molded product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14727284A JPS6125818A (en) | 1984-07-16 | 1984-07-16 | Molding method of sheet container made of synthetic resin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14727284A JPS6125818A (en) | 1984-07-16 | 1984-07-16 | Molding method of sheet container made of synthetic resin |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6125818A true JPS6125818A (en) | 1986-02-04 |
| JPH0557096B2 JPH0557096B2 (en) | 1993-08-23 |
Family
ID=15426456
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14727284A Granted JPS6125818A (en) | 1984-07-16 | 1984-07-16 | Molding method of sheet container made of synthetic resin |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6125818A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05293885A (en) * | 1991-02-22 | 1993-11-09 | Osaka Kasei Kk | Sheet consisting of low viscosity polyester resin and its manufacture |
| JP2002292725A (en) * | 2001-03-29 | 2002-10-09 | Toyo Seikan Kaisha Ltd | Heat resistant and impact resistant container |
| WO2017050664A1 (en) * | 2015-09-25 | 2017-03-30 | Koninklijke Philips N.V. | Optical position control |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103707452B (en) * | 2007-09-14 | 2017-05-03 | 神秘制药公司 | Deep draw container forming method |
-
1984
- 1984-07-16 JP JP14727284A patent/JPS6125818A/en active Granted
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05293885A (en) * | 1991-02-22 | 1993-11-09 | Osaka Kasei Kk | Sheet consisting of low viscosity polyester resin and its manufacture |
| JP2002292725A (en) * | 2001-03-29 | 2002-10-09 | Toyo Seikan Kaisha Ltd | Heat resistant and impact resistant container |
| JP4506018B2 (en) * | 2001-03-29 | 2010-07-21 | 東洋製罐株式会社 | Heat and impact resistant containers |
| WO2017050664A1 (en) * | 2015-09-25 | 2017-03-30 | Koninklijke Philips N.V. | Optical position control |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0557096B2 (en) | 1993-08-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |