JPH0573568B2 - - Google Patents
Info
- Publication number
- JPH0573568B2 JPH0573568B2 JP2562985A JP2562985A JPH0573568B2 JP H0573568 B2 JPH0573568 B2 JP H0573568B2 JP 2562985 A JP2562985 A JP 2562985A JP 2562985 A JP2562985 A JP 2562985A JP H0573568 B2 JPH0573568 B2 JP H0573568B2
- Authority
- JP
- Japan
- Prior art keywords
- resin
- layer
- inner layer
- mold
- parison
- 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
Links
- 229920005989 resin Polymers 0.000 claims description 42
- 239000011347 resin Substances 0.000 claims description 42
- 238000000034 method Methods 0.000 claims description 25
- LLLVZDVNHNWSDS-UHFFFAOYSA-N 4-methylidene-3,5-dioxabicyclo[5.2.2]undeca-1(9),7,10-triene-2,6-dione Chemical group C1(C2=CC=C(C(=O)OC(=C)O1)C=C2)=O LLLVZDVNHNWSDS-UHFFFAOYSA-N 0.000 claims description 11
- 229920001225 polyester resin Polymers 0.000 claims description 5
- 239000004645 polyester resin Substances 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 85
- 229920000139 polyethylene terephthalate Polymers 0.000 description 13
- 239000005020 polyethylene terephthalate Substances 0.000 description 13
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 12
- 238000002347 injection Methods 0.000 description 12
- 239000007924 injection Substances 0.000 description 12
- 230000004888 barrier function Effects 0.000 description 9
- 229920000728 polyester Polymers 0.000 description 9
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 8
- 238000002425 crystallisation Methods 0.000 description 6
- 230000008025 crystallization Effects 0.000 description 6
- 229920001634 Copolyester Polymers 0.000 description 5
- 239000011229 interlayer Substances 0.000 description 5
- 230000002087 whitening effect Effects 0.000 description 5
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical group OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 description 4
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical group CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical group OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- MMINFSMURORWKH-UHFFFAOYSA-N 3,6-dioxabicyclo[6.2.2]dodeca-1(10),8,11-triene-2,7-dione Chemical group O=C1OCCOC(=O)C2=CC=C1C=C2 MMINFSMURORWKH-UHFFFAOYSA-N 0.000 description 2
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 description 2
- -1 Polyethylene terephthalate Polymers 0.000 description 2
- ORLQHILJRHBSAY-UHFFFAOYSA-N [1-(hydroxymethyl)cyclohexyl]methanol Chemical group OCC1(CO)CCCCC1 ORLQHILJRHBSAY-UHFFFAOYSA-N 0.000 description 2
- 239000012790 adhesive layer Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical group OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 1
- FDLQZKYLHJJBHD-UHFFFAOYSA-N [3-(aminomethyl)phenyl]methanamine Chemical compound NCC1=CC=CC(CN)=C1 FDLQZKYLHJJBHD-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 238000000071 blow moulding Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- SLCVBVWXLSEKPL-UHFFFAOYSA-N neopentyl glycol Chemical group OCC(C)(C)CO SLCVBVWXLSEKPL-UHFFFAOYSA-N 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000000126 substance Substances 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/16—Making multilayered or multicoloured articles
- B29C45/1615—The materials being injected at different moulding stations
- B29C45/1625—Injecting parison-like articles
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/03—Injection moulding apparatus
- B29C45/04—Injection moulding apparatus using movable moulds or mould halves
- B29C45/06—Injection moulding apparatus using movable moulds or mould halves mounted on a turntable, i.e. on a rotating support having a rotating axis parallel to the mould opening, closing or clamping direction
- B29C45/062—Injection moulding apparatus using movable moulds or mould halves mounted on a turntable, i.e. on a rotating support having a rotating axis parallel to the mould opening, closing or clamping direction carrying mould halves co-operating with fixed mould halves
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、複層ボトルを得るための複層パリソ
ンの製造方法であつて、特に内層がエチレンテレ
フタレート系ポリエステル、外層がガスバリア層
からなるパリソンを得るのに好適な方法に関す
る。Detailed Description of the Invention (Industrial Application Field) The present invention relates to a method for manufacturing a multi-layer parison for obtaining a multi-layer bottle, and particularly a parison whose inner layer is made of ethylene terephthalate polyester and whose outer layer is a gas barrier layer. Concerning a suitable method for obtaining.
（従来技術）
従来からポリエチレンテレフタレート樹脂（以
下「PET」と略記する）は、その優れた機械的
強度、ガスバリア性、衛生性等の性能を生かし
て、各種の容器、特にボトル等の中空容器として
広く用いられている。ところがPETは、高度の
ガスバリア性を要求する食品や飲料の容器として
はガスバリア性が万全ではなく、この欠点を補う
ため、ガスバリア性の高いエチレン−ビニルアル
コール共重合体等を積層することが知られてい
る。(Prior art) Polyethylene terephthalate resin (hereinafter abbreviated as "PET") has traditionally been used as a variety of containers, especially hollow containers such as bottles, by taking advantage of its excellent mechanical strength, gas barrier properties, and hygiene properties. Widely used. However, PET does not have perfect gas barrier properties when used as food and beverage containers, which require a high level of gas barrier properties.In order to compensate for this drawback, it is known that PET is laminated with a material such as ethylene-vinyl alcohol copolymer, which has high gas barrier properties. ing.
そしてかかる複層ボトル用のパリソンを得る方
法としては、多層押出法と多層射出法とがある
が、多層押出法は、別工程で底部や口部を形成す
る必要があるという難点がある。この点多層射出
法は−工程で有底パリソンが得られるという利点
があるが、同時に数種の樹脂を一つの金型内に層
状に射出する方法では各層の厚さを正確に制御で
きず、また数個の金型を用いて各層を順次射出形
成する方法では特別の処理をしなければ各層間の
接着強度がほとんど得られないという問題があ
る。 Methods for obtaining parisons for such multilayer bottles include multilayer extrusion and multilayer injection, but multilayer extrusion has the disadvantage of requiring separate steps to form the bottom and mouth. In this respect, the multilayer injection method has the advantage of being able to obtain a parison with a bottom in one step, but the method of injecting several types of resin in layers into one mold at the same time does not allow accurate control of the thickness of each layer. Furthermore, the method of sequentially injection-forming each layer using several molds has the problem that almost no adhesive strength between the layers can be obtained unless special treatment is performed.
ところで最近、ボトル成形以外の分野で、ある
樹脂から部品を射出成形し、次いで射出金型の外
型のみを交換して直ちに異種の樹脂を射出して別
の部品を成形することにより、異種の樹脂からな
る２個の部品を金型内でアセンブルする方法が行
われており、本発明者等は、この方法によつてパ
リソンを製造すれば内層が冷却しないうちに外層
を射出できるので、各層の厚さを正確に制御しな
がら比較的良い層間接着力が得られると考えた。 By the way, recently, in fields other than bottle molding, parts are injection molded from a certain resin, then only the outer mold of the injection mold is replaced, and a different type of resin is immediately injected to mold another part. A method has been used in which two parts made of resin are assembled in a mold, and the inventors believe that if the parison is manufactured using this method, the outer layer can be injected before the inner layer cools, so each layer It was thought that relatively good interlayer adhesion force could be obtained while accurately controlling the thickness of the layer.
（発明が解決しようとする問題点）
ところがこの方法をPETを内層とする複層ボ
トルの製造に適用すると、実際には層間接着力が
ほとんど得られず、また外層射出時に内層表面が
結晶化して白化し、外観や層間接着性を損なうと
いう問題が生じることが判明した。(Problem to be solved by the invention) However, when this method is applied to the production of multilayer bottles with PET as the inner layer, almost no interlayer adhesion is actually obtained, and the inner layer surface crystallizes when the outer layer is injected. It has been found that there is a problem of whitening and impairing the appearance and interlayer adhesion.
即ちこの方法では、一般に接着剤層を設けたり
接着性改良処理を施すことが困難であること、及
びこの方法では内層が形状を保持し得る範囲内で
できるだけ高温にあるうちに外層に射出するのが
有利であるが、このようにすると外層射出時に内
層のPET層が結晶化しやすい温度域に長時間あ
る結果となり、上のような欠点が生じる。 In other words, with this method, it is generally difficult to provide an adhesive layer or perform adhesion improvement treatment, and in this method, the outer layer is injected while the inner layer is at as high a temperature as possible while still retaining its shape. However, this method results in the inner PET layer remaining in a temperature range where crystallization is likely to occur for a long time during injection of the outer layer, resulting in the above-mentioned drawbacks.
（問題点を解決するための手段）
本発明は、内層がエチレンテレフタレート系ポ
リエステル樹脂からなる複層パリソンを、良好な
層間接着力で、しかも白化を伴なわずに得る方法
を提供するものであつて、その特徴は、内層の樹
脂として、120℃で30分熱処理したときの密度増
加が６×10-3ｇ／cm3以下のものを用い、また外層
の樹脂としてエチレンテレフタレート系ポリエス
テル樹脂と異種の樹脂との混合樹脂を用いて連続
２段射出成形を行う点にある。(Means for Solving the Problems) The present invention provides a method for obtaining a multilayer parison whose inner layer is made of ethylene terephthalate polyester resin with good interlayer adhesion and without whitening. Its characteristics are that the inner layer resin has a density increase of 6×10 -3 g/cm 3 or less when heat treated at 120°C for 30 minutes, and the outer layer resin is a resin different from ethylene terephthalate polyester resin. The point is that continuous two-stage injection molding is performed using a mixed resin with a resin.
以下本発明を図面を参照して具体的に説明す
る。 The present invention will be specifically described below with reference to the drawings.
第１図は本発明方法を実施する装置の一例を示
す断面図、第２図は同装置による内層形成工程を
示す断面図、第３図は同じく外層形成工程を示す
断面図であつて、１ａ及び１ｂは同形の内層及び
外層兼用内型、２ａは内層用外型、２ｂは外層用
外型である。そして内型１ａと外型２ａとの間に
内層用キヤビテイが形成され、そのキヤビテイ内
で形成された内層４と外型２ｂとの間に外層用キ
ヤビテイが形成される。そして内型１ａと１ｂと
は迅速に反転移動してその位置が入れ替るように
なつている。また３ａは内層の射出ヘツド、３ｂ
は外層の射出ヘツドである。 FIG. 1 is a cross-sectional view showing an example of an apparatus for carrying out the method of the present invention, FIG. 2 is a cross-sectional view showing an inner layer forming process using the same apparatus, and FIG. 3 is a cross-sectional view showing an outer layer forming process. 1b is an inner mold for both inner and outer layers of the same shape, 2a is an outer mold for the inner layer, and 2b is an outer mold for the outer layer. An inner layer cavity is formed between the inner mold 1a and the outer mold 2a, and an outer layer cavity is formed between the inner layer 4 formed within the cavity and the outer mold 2b. The inner molds 1a and 1b are quickly reversed and their positions are exchanged. Also, 3a is the injection head of the inner layer, 3b
is the injection head of the outer layer.
本発明方法においては、まず第２図に示すよう
に、型１ａと２ａ、１ｂと２ｂとを組合せ、次い
で内型１ａと内層用外型２ａとの間に射出ヘツド
３ａより内層樹脂を射出して内層４を形成する。 In the method of the present invention, first, as shown in FIG. 2, molds 1a and 2a and 1b and 2b are combined, and then the inner layer resin is injected from the injection head 3a between the inner mold 1a and the outer mold 2a for the inner layer. Then, the inner layer 4 is formed.
内層に用いる樹脂は、エチレンテレフタレート
単位を主体とするポリエステルであつて、120℃
で30分熱処理したときの密度増加（以下△ρとい
う）が６×10-3ｇ／cm3以下、好ましくは４×10-3
ｇ／cm3以下のものである。 The resin used for the inner layer is polyester mainly composed of ethylene terephthalate units, and is heated at 120°C.
The increase in density (hereinafter referred to as △ ρ) when heat-treated for 30 minutes at
g/cm 3 or less.
△ρを６×10-3ｇ／cm3以下とするには、テレフ
タル酸及び／またはエチレングリコールの一部を
他の成分に代えてコポリエステルとすればよく、
例えばテレフタル酸の一部をイソフタル酸に置換
したり、エチレングリコールの一部を、ジエチレ
ングリコール、プロピレングリコール、テトラメ
チレングリコール、シクロヘキサンジメタノー
ル、ネオペンチルグリコール等に置換すればよ
い。また上記低結晶性ポリエステルを通常の
PETにブレンドする方法、あるいは極限粘度が
例えば1.15以上の高重合度PETを用いる方法等も
採用し得る。 In order to make Δρ 6×10 -3 g/cm 3 or less, part of the terephthalic acid and/or ethylene glycol may be replaced with other components to form a copolyester,
For example, a portion of terephthalic acid may be replaced with isophthalic acid, or a portion of ethylene glycol may be replaced with diethylene glycol, propylene glycol, tetramethylene glycol, cyclohexanedimethanol, neopentyl glycol, or the like. In addition, the above low-crystalline polyester is
A method of blending with PET or a method of using PET with a high degree of polymerization having an intrinsic viscosity of, for example, 1.15 or more may also be adopted.
△ρが上記値よりも大きいと、内層上に外層樹
脂を射出したときに外層樹脂により内層表面が加
熱されて結晶化し、白化や接着性不良といつた問
題が生じる。 If Δρ is larger than the above value, when the outer layer resin is injected onto the inner layer, the inner layer surface will be heated and crystallized by the outer layer resin, causing problems such as whitening and poor adhesion.
但し、コポリエステルを用いる場合、共重合成
分が多すぎるとPETの持つ強度や成形容易性と
いつた特性が損われるので、エチレンテレフタレ
ート単位が90モル％以上、好ましくは95モル％前
後となるようにするのがよい。 However, when using a copolyester, if the copolymer content is too large, the properties of PET such as strength and moldability will be impaired, so the ethylene terephthalate unit content should be at least 90 mol%, preferably around 95 mol%. It is better to
なおここで△ρは、実質的に非晶質で未配向の
プレスシートを、熱風オーブン中で120℃で30分
間加熱し、加熱前後の密度変化を密度勾配管法
（JIS K7112 Ｄ法）により測定したものである。 Here, △ρ is obtained by heating a substantially amorphous and unoriented press sheet at 120°C for 30 minutes in a hot air oven, and measuring the density change before and after heating using the density gradient tube method (JIS K7112 D method). This is what was measured.
内層樹脂射出後、内層樹脂を結晶化温度域以下
まで降温させてから外型を取外し、次いで内型１
ａに内層４を付けたままの状態で該内型１ａを反
転させて、第３図に示すように外層用外型２ｂ内
にセツトする。このときの内層樹脂の温度は通
常、内部で100℃前後、表面はさらに低温になつ
ている。この型の交換は、内層樹脂の過冷や表面
変質を生じないように数秒以内に行うのが好まし
い。 After the inner layer resin is injected, the outer mold is removed after cooling the inner layer resin to below the crystallization temperature range, and then the inner mold 1 is removed.
With the inner layer 4 still attached to the inner mold 1a, the inner mold 1a is turned over and set in the outer mold 2b for the outer layer as shown in FIG. At this time, the temperature of the inner layer resin is usually around 100°C inside, and the surface is even colder. It is preferable to replace the mold within a few seconds to avoid overcooling or surface deterioration of the inner layer resin.
そしてこの状態で、外層樹脂を射出ヘツド３ｂ
より射出して外層５を形成する。一方その間に、
内型１ｂと外型２ａとの間のキヤビテイ内に射出
ヘツド３ａより内層樹脂を射出して次のパリソン
の内層４が形成される。 In this state, the outer layer resin is transferred to the injection head 3b.
The outer layer 5 is formed by injection. Meanwhile, in the meantime
The inner layer 4 of the next parison is formed by injecting the inner layer resin from the injection head 3a into the cavity between the inner mold 1b and the outer mold 2a.
外層５としてはエチレンテレフタレート系ポリ
エステル樹脂とそれ以外の各種樹脂との混合樹脂
を用いることができるが、異種樹脂としては特に
ガスバリア性樹脂を用いるのが有用であり、好適
なガスバリア性樹脂としては、例えば、エチレン
ビニルアルコール共重合樹脂、メタキシリレンジ
アミン系ポリアミド、ポリエチレンイソフタレー
ト等が挙げられる。本発明のような多層射出成形
の場合には、一般に接着剤層を設けないので、こ
れらの樹脂にエチレンテレフタレート系ポリエス
テル（PETまたはそのコポリエステル）を混合
して、外層の強度向上とともに内層との接着性向
上を図る必要がある。その混合比率は、エチレン
テレフタレート系ポリエステル20〜80重量部、ガ
スバリア性樹脂80〜20重量部の範囲が好ましい。
この外層のエチレンテレフタレート系ポリエステ
ルとしては、内層と同じものを用いることもでき
る。 For the outer layer 5, a mixed resin of an ethylene terephthalate polyester resin and various other resins can be used, but it is especially useful to use a gas barrier resin as the different resin, and suitable gas barrier resins include: Examples include ethylene vinyl alcohol copolymer resin, metaxylylene diamine polyamide, polyethylene isophthalate, and the like. In the case of multilayer injection molding as in the present invention, an adhesive layer is generally not provided, so ethylene terephthalate polyester (PET or its copolyester) is mixed with these resins to improve the strength of the outer layer and improve the bonding with the inner layer. It is necessary to improve adhesion. The mixing ratio is preferably in the range of 20 to 80 parts by weight of the ethylene terephthalate polyester and 80 to 20 parts by weight of the gas barrier resin.
As the ethylene terephthalate polyester for this outer layer, the same one as for the inner layer can also be used.
上記のガスバリア性樹脂混合物は、一般に230
℃以上の樹脂温度で射出する必要があるので、内
層として通常のPETを用いた場合にはその結晶
化を誘発するが、本発明に規定する樹脂を用いた
場合にはこのような現象が全くみられない。 The above gas barrier resin mixture is generally 230
Since it is necessary to inject at a resin temperature of ℃ or higher, if ordinary PET is used as the inner layer, crystallization will be induced, but if the resin specified in the present invention is used, this phenomenon will not occur at all. I can't see it.
外層樹脂を射出して冷却後、外層用外型２ｂを
開いてパリソンを取り出し、内型１ａと１ｂとを
第１図に示す位置に反転させて次回の成形を行
う。こうして得られたパリソンは、通常のブロー
成形法によりボトルとすることができる。 After the outer layer resin is injected and cooled, the outer mold 2b for the outer layer is opened, the parison is taken out, and the inner molds 1a and 1b are inverted to the positions shown in FIG. 1 for the next molding. The parison thus obtained can be made into a bottle by a conventional blow molding method.
（発明の効果）
本発明方法によれば、内層と外層の厚さが良く
制御されたパリソンが得られる。そして内層とし
て結晶化の遅いポリエステルを用いることによ
り、外層射出時の内層樹脂の結晶化が抑制されて
透明性良好なパリソンが得られ、また透明性を必
要としない場合にあつても層間接着性が良いパリ
ソンが得られる。(Effects of the Invention) According to the method of the present invention, a parison in which the thicknesses of the inner layer and outer layer are well controlled can be obtained. By using polyester with slow crystallization for the inner layer, crystallization of the inner layer resin during injection of the outer layer is suppressed, resulting in a parison with good transparency, and even when transparency is not required, interlayer adhesion is maintained. A good parison can be obtained.
また外層樹脂にエチレンテレフタレート系ポリ
エステルを混合することにより、外層の強度が向
上するとともに、外層と内層とが共通成分を有す
るため両層は良好に接着する。 Further, by mixing ethylene terephthalate polyester with the outer layer resin, the strength of the outer layer is improved, and since the outer layer and the inner layer have a common component, both layers are bonded well.
そして内層にエチレンテレフタレート成分を主
体とするポリエステルを用いることにより、ボト
ルは強度的に補強されるとともに、衛生性に優れ
異物の溶出のおそれがない
（実施例）
内層として次の２種類の樹脂を用い、
(S) PET（極限粘度0.85）
(T) テレフタル酸と、エチレングリコール95モル
％及びシクロヘキサンジメタノール５モル％と
のコポリエステル（極限粘度0.8）
外層として、
イソフタル酸90モル％及びテレフタル酸10モル
％と、エチレングリコールとのコポリエステル60
重量％にPET（Ｓ）40重量％を混合した樹脂
を用いて２層パリソンを製造した。 By using polyester containing ethylene terephthalate as the main component for the inner layer, the bottle is strengthened and has excellent hygiene, with no risk of elution of foreign substances (example). (S) PET (intrinsic viscosity 0.85) (T) Copolyester of terephthalic acid with 95 mol% ethylene glycol and 5 mol% cyclohexanedimethanol (intrinsic viscosity 0.8) As outer layer, 90 mol% isophthalic acid and terephthalic acid Copolyester 60 with 10 mol% and ethylene glycol
A two-layer parison was manufactured using a resin in which 40% by weight of PET(S) was mixed.
（Ｓ）の△ρは16×10-3ｇ／cm3、（Ｔ）の結晶
化速度は２×10-3ｇ／cm3であつた。 The Δρ of (S) was 16×10 −3 g/cm 3 , and the crystallization rate of (T) was 2×10 −3 g/cm 3 .
成形は、第１図に示す装置を用いて、まず内層
樹脂を285℃で金型内に射出して有底筒状のパリ
ソンとし、次いで外型を交換して直ちに外層樹脂
を280℃でパリソンの胴部及び底部相当部に射出
して、内層厚さ３mm、外層厚さ２mmの二層のパリ
ソンを得た。次いでそのパリソンをブロー成形し
て高さ250mm、胴径120mm、胴部厚さ約0.4mmの丸
底のボトルとした。得られたパリソン及びボトル
について外観をみたところ、（Ｓ）では界面に白
化がみられたのに対し、本発明に係る（Ｔ）では
白化は全くみられなかつた。また（Ｓ）では、ボ
トルにして指で強く押したところ内層と外層との
間で剥離がみとめられたが、（Ｔ）では同一条件
でも剥離はみられなかつた。 Molding is carried out using the equipment shown in Figure 1. First, the inner layer resin is injected into a mold at 285°C to form a parison with a cylindrical bottom. Then, the outer mold is replaced and the outer layer resin is immediately injected into a parison at 280°C. A two-layer parison with an inner layer thickness of 3 mm and an outer layer thickness of 2 mm was obtained. The parison was then blow-molded into a round-bottomed bottle with a height of 250 mm, a body diameter of 120 mm, and a body thickness of approximately 0.4 mm. When looking at the appearance of the parison and bottle obtained, whitening was observed at the interface in (S), whereas no whitening was observed in (T) according to the present invention. In addition, in (S), peeling was observed between the inner layer and outer layer when the bottle was pressed strongly with a finger, but in (T), no peeling was observed even under the same conditions.
第１図は本発明方法を実施する装置の一例を示
す断面図、第２図は同装置による内層形成工程を
示す断面図、第３図は同じく外層形成工程を示す
断面図。
１ａ，１ｂ……内型、２ａ……内層用外型、２
ｂ……外層用外型、４……パリソン内層、５……
パリソン外層。
FIG. 1 is a sectional view showing an example of an apparatus for carrying out the method of the present invention, FIG. 2 is a sectional view showing an inner layer forming step using the same apparatus, and FIG. 3 is a sectional view showing an outer layer forming step. 1a, 1b...inner mold, 2a...outer mold for inner layer, 2
b... Outer mold for outer layer, 4... Parison inner layer, 5...
Parison outer layer.
Claims (1)
ル樹脂、外層がエチレンテレフタレート系ポリエ
ステル樹脂と異種の樹脂との混合樹脂からなる複
層パリソンを得る方法であつて、120℃で30分熱
処理したときの密度増加が６×10-3ｇ／cm3以下で
ある内層樹脂を内層用金型内に射出し、その内層
用金型の外型を外層用外型に交換して、内層樹脂
が完全に冷却しないうちに、外層樹脂を射出して
複層パリソンとすることを特徴とする複層パリソ
ンの製造方法。1 A method for obtaining a multilayer parison whose inner layer is an ethylene terephthalate polyester resin and whose outer layer is a mixed resin of an ethylene terephthalate polyester resin and a different type of resin, and the density increase when heat treated at 120°C for 30 minutes is 6x. Inject the inner layer resin with a weight of 10 -3 g/cm 3 or less into the inner layer mold, replace the outer mold of the inner layer mold with the outer mold, and before the inner layer resin has completely cooled, A method for manufacturing a multi-layer parison, characterized by injecting an outer layer resin to form a multi-layer parison.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2562985A JPS61185417A (en) | 1985-02-13 | 1985-02-13 | Manufacture of multi-layer parison |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2562985A JPS61185417A (en) | 1985-02-13 | 1985-02-13 | Manufacture of multi-layer parison |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61185417A JPS61185417A (en) | 1986-08-19 |
| JPH0573568B2 true JPH0573568B2 (en) | 1993-10-14 |
Family
ID=12171156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2562985A Granted JPS61185417A (en) | 1985-02-13 | 1985-02-13 | Manufacture of multi-layer parison |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61185417A (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5571470A (en) * | 1994-02-18 | 1996-11-05 | The Coca-Cola Company | Method for fabricating a thin inner barrier layer within a preform |
| ATE193239T1 (en) * | 1994-12-09 | 2000-06-15 | Plasthing S A S Di Modesto Mas | DEVICE FOR INJECTION MOLDING CONTAINERS OR PREFORMS FOR PLASTIC CONTAINERS |
| US6217818B1 (en) * | 1995-07-07 | 2001-04-17 | Continental Pet Technologies, Inc. | Method of making preform and container with crystallized neck finish |
| AR002773A1 (en) | 1995-07-07 | 1998-04-29 | Continental Pet Technologies | METHOD FOR INJECTION MOLDING OF A PLASTIC ARTICLE AND APPARATUS TO CARRY IT OUT. |
| DE19907387A1 (en) * | 1999-02-20 | 2000-08-31 | Karl Hehl | Plastic articles consisting of several materials as well as processes for their production |
| US9919841B2 (en) | 2007-04-19 | 2018-03-20 | Anheuser-Busch Inbev S.A. | Integrally blow-moulded bag-in-container having interface vents opening to the atmosphere at location adjacent to bag's mouth, preform for making it; and processes for producing the preform and bag-in-container |
| US20080257883A1 (en) | 2007-04-19 | 2008-10-23 | Inbev S.A. | Integrally blow-moulded bag-in-container having an inner layer and the outer layer made of the same material and preform for making it |
| US9944453B2 (en) | 2007-04-19 | 2018-04-17 | Anheuser-Busch Inbev S.A. | Integrally blow-moulded bag-in-container having an inner layer and the outer layer made of the same material and preform for making it |
| US20080258356A1 (en) | 2007-04-19 | 2008-10-23 | Inbev S.A. | Integrally blow-moulded bag-in-container comprising an inner layer and an outer layer comprising energy absorbing additives, and preform for making it |
-
1985
- 1985-02-13 JP JP2562985A patent/JPS61185417A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61185417A (en) | 1986-08-19 |
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