JPH1190975A - Multilayer preform with recovery polyester resin layer, manufacture of the preform, and multilayer container molded from the preform - Google Patents
Multilayer preform with recovery polyester resin layer, manufacture of the preform, and multilayer container molded from the preformInfo
- Publication number
- JPH1190975A JPH1190975A JP9291465A JP29146597A JPH1190975A JP H1190975 A JPH1190975 A JP H1190975A JP 9291465 A JP9291465 A JP 9291465A JP 29146597 A JP29146597 A JP 29146597A JP H1190975 A JPH1190975 A JP H1190975A
- Authority
- JP
- Japan
- Prior art keywords
- polyester resin
- layer
- primary molded
- recovered polyester
- preform
- 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
Links
- 229920001225 polyester resin Polymers 0.000 title claims abstract description 127
- 239000004645 polyester resin Substances 0.000 title claims abstract description 127
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 238000011084 recovery Methods 0.000 title abstract 6
- 229920005989 resin Polymers 0.000 claims abstract description 48
- 239000011347 resin Substances 0.000 claims abstract description 48
- 238000002347 injection Methods 0.000 claims description 36
- 239000007924 injection Substances 0.000 claims description 36
- 238000001746 injection moulding Methods 0.000 claims description 12
- 238000000071 blow moulding Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 3
- 238000000465 moulding Methods 0.000 abstract description 16
- 239000012535 impurity Substances 0.000 abstract description 9
- 238000010828 elution Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 98
- 229920000139 polyethylene terephthalate Polymers 0.000 description 17
- 239000005020 polyethylene terephthalate Substances 0.000 description 17
- 230000002087 whitening effect Effects 0.000 description 14
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 12
- 238000002425 crystallisation Methods 0.000 description 9
- 230000008025 crystallization Effects 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 230000002093 peripheral effect Effects 0.000 description 8
- -1 polyethylene terephthalate Polymers 0.000 description 8
- 239000000203 mixture Substances 0.000 description 5
- 229920000728 polyester Polymers 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- LLLVZDVNHNWSDS-UHFFFAOYSA-N 4-methylidene-3,5-dioxabicyclo[5.2.2]undeca-1(9),7,10-triene-2,6-dione Chemical compound C1(C2=CC=C(C(=O)OC(=C)O1)C=C2)=O LLLVZDVNHNWSDS-UHFFFAOYSA-N 0.000 description 3
- 235000014171 carbonated beverage Nutrition 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 229920001577 copolymer Polymers 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 101100160821 Bacillus subtilis (strain 168) yxdJ gene Proteins 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000032798 delamination Effects 0.000 description 2
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 2
- 239000011112 polyethylene naphthalate Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 235000006468 Thea sinensis Nutrition 0.000 description 1
- 241001122767 Theaceae Species 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 235000015203 fruit juice Nutrition 0.000 description 1
- 235000011389 fruit/vegetable juice Nutrition 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 125000005487 naphthalate group Chemical group 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- 235000020333 oolong tea Nutrition 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 239000011342 resin composition Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 235000013616 tea Nutrition 0.000 description 1
- 238000005406 washing Methods 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
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/081—Specified dimensions, e.g. values or ranges
- B29C2949/0811—Wall thickness
- B29C2949/0819—Wall thickness of a layer
-
- 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
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/26—Scrap or recycled material
Landscapes
- Containers Having Bodies Formed In One Piece (AREA)
- Laminated Bodies (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、一度内容物が充填
されて使用された後、市場から回収されたポリエステル
容器から内容物の付着、ゴミ、異種材料等の異種物質を
取り除き、洗浄した後、粉砕して得られた回収ポリエス
テル樹脂を再利用する延伸ブロー成形用多層プリフォー
ム及びこのプリフォームの製造方法並びにこのプリフォ
ームを用いて製造した多層容器に関する。BACKGROUND OF THE INVENTION The present invention relates to a method for removing foreign substances such as foreign substances such as adhesion of contents, dirt, and foreign materials from a polyester container recovered from the market after the contents have been filled and used. The present invention relates to a multilayer preform for stretch blow molding in which recycled polyester resin obtained by pulverization is reused, a method for producing this preform, and a multilayer container produced using this preform.
【０００２】[0002]
【従来の技術】近年、産業廃棄物が増大し、その廃棄物
処理が問題になってきている。特に、ポリエステル容器
の需要が急激に増大し、その廃棄物の量も年々増加の一
途をたどっており、これ等の廃棄物を有効に再利用する
ことが要求されてきた。ポリエステル樹脂製容器を市場
から回収して再生したポリエステル樹脂（回収ポリエス
テル樹脂）を再利用して容器に成形するものとして、実
公平６−６９１１号公報、特許第２５８４１９４号公
報、特開平８−２５３２２２号公報等が提案されてい
る。これ等の発明考案は、いずれも市場から回収された
回収ポリエステル樹脂を中間層にし、その両側に未使用
のポリエステル樹脂（バージンポリエステル樹脂）を配
置するものであって中間層の回収ポリエステル樹脂が白
化する問題があった。本発明者等は回収ポリエステル樹
脂を用いた多層プリフォーム及びその製造方法並びに該
多層プリフォームから成形された多層容器を発明し特願
平９−１８２９２１号として出願した。この出願の発明
は白化のない優れた発明である。2. Description of the Related Art In recent years, industrial waste has increased, and disposal of the waste has become a problem. In particular, the demand for polyester containers has been rapidly increasing, and the amount of waste has been increasing year by year. Therefore, it has been required to effectively reuse such waste. Japanese Patent Application Laid-Open No. 6-6911, Japanese Patent No. 2584194, and Japanese Patent Application Laid-Open No. 8-253222 disclose a method of collecting a polyester resin container from the market and reusing a recycled polyester resin (recovered polyester resin) to form a container. Publications have been proposed. In each of these inventions, the recovered polyester resin recovered from the market is used as an intermediate layer, and an unused polyester resin (virgin polyester resin) is disposed on both sides of the intermediate layer. There was a problem to do. The present inventors have invented a multilayer preform using a recovered polyester resin, a method for producing the same, and a multilayer container molded from the multilayer preform and filed an application as Japanese Patent Application No. 9-182921. The invention of this application is an excellent invention without whitening.
【０００３】[0003]
【発明が解決しようとする課題】従来技術における回収
ポリエステル樹脂を中間層に、バージンポリエステル樹
脂を内外層になるように共射出または共押出成形した多
層プリフォームでは、中間層が結晶化による白化が生
じ、かつ、底部ゲート部において中間層の回収ポリエス
テル樹脂が内面側に露出するため、回収ポリエステル樹
脂中の不純物が内容物中に溶出するという問題があっ
た。さらに回収ポリエステル樹脂中の白化を防止すると
共にプリフォーム中の回収ポリエステル樹脂の使用量を
多くするため一次成形体の胴部の肉厚を薄くして冷却を
促進し熱結晶化を防止すると射出時の圧力が不足して保
圧不足となるため口頚部の形状が変形する問題が発生す
る。本発明は、回収ポリエステル樹脂を再利用すると共
に回収ポリエステル樹脂の内側層への露出を防ぎ、結晶
化による白化を防止し、内側層の薄肉化による口頚部の
変形を防止したブロー成形用多層プリフォームとその製
造方法並びに多層容器を提供する。In a multilayer preform in which the recovered polyester resin in the prior art is co-injected or co-extruded so that the virgin polyester resin is formed in the intermediate layer and the virgin polyester resin is formed in the inner and outer layers, the intermediate layer is not whitened due to crystallization. In addition, since the recovered polyester resin of the intermediate layer is exposed on the inner surface side at the bottom gate portion, there is a problem that impurities in the recovered polyester resin elute into the contents. Furthermore, in order to prevent whitening in the recovered polyester resin and increase the amount of the recovered polyester resin in the preform, the thickness of the body of the primary molded body was reduced to promote cooling and prevent thermal crystallization, and injection was performed. Insufficient pressure results in insufficient holding pressure, causing a problem that the shape of the mouth and neck is deformed. SUMMARY OF THE INVENTION The present invention provides a multi-layer blow molding resin which reuses recovered polyester resin, prevents exposure of the recovered polyester resin to the inner layer, prevents whitening due to crystallization, and prevents deformation of the mouth and neck due to thinner inner layer. Provided are a reform, a method for producing the same, and a multilayer container.
【０００４】[0004]
【課題を解決するための手段】本発明者らは、回収ポリ
エステル樹脂を用いてプリフォーム及び容器を成形する
と白化が生じるということ及び回収ポリエステルの使用
率を多くすることについて研究した。その結果、白化の
生じる第１の原因として、回収ポリエステル樹脂は、そ
の大半がポリエチレンテレフタレート（ＰＥＴ）ボトル
と呼ばれる容器を市場から回収して、これ等の容器から
再生されたＰＥＴ樹脂であるが、ＰＥＴ樹脂の中にも種
々のものが使用されていることが判明した。ホットパッ
ク等の耐熱性ボトル用ＰＥＴ樹脂、炭酸飲料等の耐圧性
ボトル用ＰＥＴ樹脂、茶や飲料水等の無菌充填ボトル用
ＰＥＴ樹脂等のＰＥＴ樹脂は固有粘度やジエチレングリ
コール含有量等の組成が異なっている。特に、耐熱性ボ
トルに使用されるＰＥＴ樹脂は結晶化しやすい組成のＰ
ＥＴ樹脂を用いているために、結晶化速度が大きく、か
つ一度熱履歴を受けているため、特に白化しやすくなっ
ている。さらに、白化の生じる第２の原因として、回収
ポリエステル樹脂には若干の不純物が混入されており、
この不純物が核剤として働いて、結晶化をより促進させ
る作用をするものと推測される。しかも、従来技術では
回収ポリエステル樹脂が中間層に用いられているため、
プリフォームを射出成形すると表面層は冷却されていて
も中間層が十分冷却されないため、結晶化が促進しやす
い温度である１４０〜１８０℃に長時間維持されること
になり、白化が生じるものと推測される。Means for Solving the Problems The present inventors have studied that whitening occurs when a preform and a container are molded by using a recovered polyester resin, and that the usage rate of the recovered polyester is increased. As a result, as a first cause of whitening, most of the recovered polyester resin is a PET resin obtained by recovering containers called polyethylene terephthalate (PET) bottles from the market and regenerating from these containers. It has been found that various PET resins are used. PET resins for heat-resistant bottles such as hot packs, PET resins for pressure-resistant bottles such as carbonated beverages, and PET resins for sterile filled bottles such as tea and drinking water have different compositions such as intrinsic viscosity and diethylene glycol content. ing. In particular, PET resins used for heat-resistant bottles have P
Since the ET resin is used, the crystallization speed is high, and once the heat history is applied, it is particularly easy to whiten. Further, as a second cause of whitening, some impurities are mixed in the recovered polyester resin,
It is presumed that this impurity acts as a nucleating agent and acts to further promote crystallization. Moreover, in the prior art, since the recovered polyester resin is used for the intermediate layer,
When the preform is injection molded, the intermediate layer is not sufficiently cooled even if the surface layer is cooled, so that it is maintained at 140 to 180 ° C., which is a temperature at which crystallization is easily promoted, for a long time, and whitening occurs. Guessed.
【０００５】本発明は、 「１． 内側層と外側層とからなる延伸ブロー成形用多
層プリフォームであって、内側層がバージンポリエステ
ル樹脂を１次射出して形成した一次成形体であり、外側
層が回収ポリエステル樹脂を一次成形体の外表面に２次
射出して成形した二次成形体である少なくとも２層構造
からなり、外側層の肉厚が０．５〜２．５ｍｍであり、
一次成形体の胴部に底部から口頚部に至るリブを配置し
たことを特徴とする回収ポリエステル樹脂層を有する多
層プリフォーム。 ２． 一次成形体の胴部の肉厚がリブ以外の部分で０．
５〜２ｍｍである、１項に記載された回収ポリエステル
樹脂層を有する多層プリフォーム。 ３． 一次成形体の胴部に配置されたリブが底部から口
頚部の直下まで延びている、１項に記載された回収ポリ
エステル樹脂層を有する多層プリフォーム。 ４． 一次成形体の胴部に配置されたリブが底部から胴
部の途中まで延びている、１項に記載された回収ポリエ
ステル樹脂層を有する多層プリフォーム。 ５． 一次成形体の胴部に配置されたリブが等間隔で複
数本配置されている、１項に記載された回収ポリエステ
ル樹脂層を有する多層プリフォーム。 ６． 一次成形体の胴部に配置されたリブが外側または
内側に凸状、多角形状胴部の角部、楕円形状胴部の長径
先端部のいずれかである、１項に記載された回収ポリエ
ステル樹脂層を有する多層プリフォーム。 ７． 回収ポリエステル樹脂の使用量が多層プリフォー
ム全体の樹脂の使用量の２５重量％以上である、１項に
記載された回収ポリエステル樹脂層を有する多層プリフ
ォーム。 ８． 射出成形機を用いて最初に第１射出機からバージ
ンポリエステル樹脂を１次金型内に１次射出して胴部の
底部から口頚部に至るリブを配置した一次成形体を形成
し、次いで内側層となる一次成形体を２次金型内にセッ
トして一次成形体の外表面に第２射出機から回収ポリエ
ステル樹脂を２次射出し外側層を形成することを特徴と
する回収ポリエステル樹脂層を有する多層プリフォーム
の製造方法。 ９． 内側層の一次成形体のゲート部の長さが１ｍｍ以
下である、８項に記載された回収ポリエステル樹脂層を
有する多層プリフォームの製造方法。 １０． １項ないし１１項のいずれか１項に記載された
回収ポリエステル樹脂層を有する多層プリフォームを用
いて延伸ブロー成形された、外側層が回収ポリエステル
樹脂、内側層がバージンポリエステル樹脂で形成されて
おり、内側層にリブが形成されている回収ポリエステル
樹脂の使用量が容器全体の樹脂使用量の２５重量％以上
である回収ポリエステル樹脂層を有する多層容器。」に
関する。The present invention relates to a multilayer preform for stretch blow molding comprising an inner layer and an outer layer, wherein the inner layer is a primary molded article formed by primary injection of a virgin polyester resin; The layer is a secondary molded body formed by secondary injection of the recovered polyester resin onto the outer surface of the primary molded body, and has at least a two-layer structure, and the outer layer has a thickness of 0.5 to 2.5 mm;
A multilayer preform having a recovered polyester resin layer, wherein ribs from the bottom to the mouth and neck are arranged on the body of the primary molded body. 2. The wall thickness of the body of the primary molded body is set at 0.
2. A multilayer preform having a recovered polyester resin layer according to item 1, which is 5 to 2 mm. 3. 2. The multilayer preform having a recovered polyester resin layer according to claim 1, wherein a rib disposed on a body of the primary molded body extends from a bottom portion to a position immediately below a mouth and neck portion. 4. The multilayer preform having a recovered polyester resin layer according to claim 1, wherein a rib disposed on a body of the primary molded body extends from the bottom to a middle of the body. 5. 2. The multilayer preform having a recovered polyester resin layer according to item 1, wherein a plurality of ribs arranged on the body of the primary molded body are arranged at equal intervals. 6. 3. The recovered polyester resin according to item 1, wherein the ribs arranged on the body of the primary molded body are any one of a convex portion on the outside or the inside, a corner of the polygonal body, and a tip of a major axis of the elliptical body. Multilayer preform having layers. 7. 2. The multilayer preform having a recovered polyester resin layer according to item 1, wherein the amount of the recovered polyester resin used is 25% by weight or more of the amount of the resin used in the entire multilayer preform. 8. First, virgin polyester resin is first injected into the primary mold from the first injection machine using an injection molding machine to form a primary molded body in which ribs from the bottom of the body to the mouth and neck are arranged, and then the inside is formed. A recovered polyester resin layer, wherein a primary molded body to be a layer is set in a secondary mold, and a recovered polyester resin is secondarily injected from a second injection machine to an outer surface of the primary molded body to form an outer layer. A method for producing a multilayer preform having: 9. 9. The method for producing a multilayer preform having a recovered polyester resin layer according to item 8, wherein the length of the gate portion of the primary molded body of the inner layer is 1 mm or less. 10. The outer layer is formed of a recovered polyester resin, and the inner layer is formed of a virgin polyester resin, which is stretch blow-molded using the multilayer preform having the recovered polyester resin layer according to any one of Items 1 to 11. A multilayer container having a recovered polyester resin layer in which the amount of the recovered polyester resin having the ribs formed in the inner layer is 25% by weight or more of the total amount of the resin used in the container. About.
【０００６】本発明のプリフォームは、先ずバージンポ
リエステル樹脂を一次金型内に１次射出して一次成形体
を形成し、この一次成形体を二次金型内に移して一次成
形体の外表面に回収ポリエステル樹脂を２次射出してな
る２層構造の多層プリフォームであり、外層の厚さをコ
ントロールすることによって白化を防止すると共に、内
側層と外側層を２工程で行っているので回収ポリエステ
ル樹脂中の不純物が内容物中に溶出されるのを完全に防
止することができる。しかし、本発明の多層プリフォー
ムは、２層構造に限定されるものではなく、回収ポリエ
ステル樹脂層を外表面として白化を防止する構造であれ
ばよい。再使用する回収ポリエステル樹脂の使用量を多
くすること及び結晶化による白化を防止することの両方
を満足するために、内側層となる一次成形体の胴部の肉
厚を薄くすることが有効である。そして、内側層を形成
するポリエステル樹脂としては、未使用のバージンポリ
エステル樹脂が使用され、ポリエチレンテレフタレート
樹脂いわゆるＰＥＴ樹脂と呼ばれる合成樹脂が好適に使
用されるが、エチレンテレフタレート／エチレンイソフ
タレート共重合体、ポリエチレンナフタレート樹脂等も
使用できる。また、外側層を形成するポリエステル樹脂
としては、市場から回収された容器から再生された回収
ポリエステル樹脂が用いられ、このポリエステル樹脂と
してＰＥＴ樹脂が最も多く使用される。しかしながら、
一次成形体の胴部の肉厚を薄くするには樹脂流路を狭く
する必要があり、そのため樹脂圧が低くなって十分な射
出保持圧力（保圧）が確保できなくなり、プリフォーム
の口頚部に変形（歪み）が発生することになる。これを
防止するために、一次成形体の動日に１本または複数本
の縦リブを形成することにより保圧を確保することが可
能となる。[0006] In the preform of the present invention, a virgin polyester resin is firstly injected into a primary mold to form a primary molded body, and the primary molded body is transferred into a secondary mold to form an outside of the primary molded body. It is a multi-layered preform with a two-layer structure in which the recovered polyester resin is secondarily injected onto the surface. The thickness of the outer layer is controlled to prevent whitening, and the inner layer and the outer layer are formed in two steps. It is possible to completely prevent impurities in the recovered polyester resin from being eluted into the contents. However, the multilayer preform of the present invention is not limited to the two-layer structure, and may have any structure as long as the recovered polyester resin layer has an outer surface to prevent whitening. In order to satisfy both the use of the recovered polyester resin to be reused and the prevention of whitening due to crystallization, it is effective to reduce the wall thickness of the body of the primary molded body serving as the inner layer. is there. As the polyester resin forming the inner layer, an unused virgin polyester resin is used, and a synthetic resin called a polyethylene terephthalate resin, a so-called PET resin, is preferably used, and an ethylene terephthalate / ethylene isophthalate copolymer, Polyethylene naphthalate resin and the like can also be used. As the polyester resin forming the outer layer, a recovered polyester resin recovered from a container recovered from the market is used, and PET resin is most often used as the polyester resin. However,
In order to reduce the thickness of the body of the primary molded body, it is necessary to narrow the resin flow path. As a result, the resin pressure becomes low, and it becomes impossible to secure a sufficient injection holding pressure (holding pressure). Deformation (distortion) occurs. In order to prevent this, one or more vertical ribs are formed on the moving day of the primary molded body, so that it is possible to secure the pressure retention.
【０００７】本発明で言う回収ポリエステル樹脂とは、
一度内容物を充填して使用された後回収されたいわゆる
ＰＥＴボトルと呼ばれる容器を粉砕・洗浄して再生され
たポリエステル樹脂であって、微量の不純物が混入され
ている可能性がある。さらに、回収されるポリエステル
容器としては、ジュース用等の耐熱性容器、炭酸飲料等
の耐圧性容器、ウーロン茶等の一般物、果汁入り炭酸飲
料等の耐熱圧性容器、さらには化粧品、洗剤等種々のも
のがあり、使用する樹脂も用途により異なり、回収ポリ
エステル樹脂は種々のポリエステル樹脂が混合してお
り、結晶化がより促進され易くなっている。この回収ポ
リエステル樹脂と工場で容器製造の際に生ずるスクラッ
プとは根本的な相違がある。各工場で排出されるスクラ
ップは分別して回収されるので、再使用時には成形を行
う樹脂と同質のものを使用することができるが、回収ポ
リエステル樹脂は種々のポリエステルが混在するため成
形における物理的性質も異なる。そのため一度使用され
た回収ポリエステル樹脂を再使用することは成形上から
みても良好な容器を得ることが困難であった。そして、
種々不純物も混入するので内容物と接する容器の内層に
使用することができず内層はバージンポリエステル樹脂
を使用する必要がある。The recovered polyester resin referred to in the present invention is:
It is a polyester resin that is obtained by crushing and washing a container called a PET bottle, which is recovered after being used after being filled with the content once, and may contain a small amount of impurities. Further, as polyester containers to be recovered, heat-resistant containers for juices and the like, pressure-resistant containers such as carbonated beverages, general objects such as oolong tea, heat-resistant pressure containers such as fruit juice-containing carbonated beverages, and various cosmetics and detergents. There are some resins, and the resin to be used also varies depending on the application. The recovered polyester resin is a mixture of various polyester resins, and crystallization is more easily promoted. There is a fundamental difference between the recovered polyester resin and the scrap generated during the production of containers at the factory. The scrap discharged at each factory is separated and collected, so that when reused, the same resin as the resin to be molded can be used, but the recovered polyester resin is a mixture of various polyesters and has physical properties in molding. Is also different. For this reason, it is difficult to reuse a recovered polyester resin that has been used once to obtain a good container from the viewpoint of molding. And
Since various impurities are mixed therein, it cannot be used for the inner layer of the container in contact with the contents, and the inner layer needs to use a virgin polyester resin.
【０００８】[0008]
【発明の実施の形態】本発明においては、多層プリフォ
ームの内側層にはバージンポリエステル樹脂を使用し、
外側層においては回収ポリエステル樹脂を使用するもの
である。本発明の多層プリフォームは、バージンポリエ
ステル樹脂を１次金型内で１次射出して内側層となる一
次成形体を形成し、この一次成形体を２次金型内に移し
て一次成形体の外表面に回収ポリエステル樹脂を２次射
出して多層プリフォームを成形する。DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, a virgin polyester resin is used for an inner layer of a multilayer preform,
In the outer layer, a recovered polyester resin is used. In the multilayer preform of the present invention, a virgin polyester resin is primarily injected into a primary mold to form a primary molded body serving as an inner layer, and the primary molded body is transferred into a secondary mold to form a primary molded body. A secondary injection of the recovered polyester resin is performed on the outer surface of the preform to form a multilayer preform.
【０００９】バージンポリエステル樹脂を用いて１次射
出して得られた一次成形体のゲート部の長さを短くする
ことが効果的である。該ゲート部の長さが長すぎると、
その長さを一定寸法以下にゲート部を切断する必要があ
る。しかし、このゲートカット工程を設けることは、一
工程増えることになり、それだけ成形時間が増すと共に
品質的にも不良品の発生する割合が高くなる。このゲー
ト部の長さが長すぎると、一次成形体の外表面に回収ポ
リエステル樹脂を２次射出する際に一次成形体のゲート
部が２次射出される樹脂の流路を阻害するため、２次射
出される樹脂の流れが不規則になり、その結果外側層が
均一な肉厚にならず。満足な多層プリフォームが得られ
ないという問題が生じた。It is effective to shorten the length of the gate portion of the primary molded product obtained by primary injection using a virgin polyester resin. If the length of the gate portion is too long,
It is necessary to cut the gate portion so that its length is less than a certain dimension. However, providing this gate cutting step increases the number of steps by one, which increases the molding time and increases the rate of occurrence of defective products in terms of quality. If the length of the gate portion is too long, the gate portion of the primary molded product obstructs the flow path of the secondary injected resin when the recovered polyester resin is secondarily injected onto the outer surface of the primary molded product. The flow of the next injected resin becomes irregular, so that the outer layer does not have a uniform thickness. There has been a problem that a satisfactory multilayer preform cannot be obtained.
【００１０】本発明の多層プリフォームを射出成形する
場合、一次成形体のゲート部の長さを２ｍｍ以下、特に
１ｍｍ以下にすることが好ましく、この長さを０ｍｍに
することもできる。この一次成形体の短いゲート部は、
射出金型のバルブゲート設計時に行い、ショートゲート
用の設計したバルブゲートを有する射出金型を用いれば
よい。本発明の多層プリフォームにおいては、回収ポリ
エステル樹脂を有効に再利用することを目標としてお
り、この回収ポリエステル樹脂を有効再利用するために
は回収樹脂の使用量はプリフォーム全体の樹脂の使用量
の２５重量％以上であることが好ましく、リサイクル樹
脂を有効再利用を図るものである。When the multilayer preform of the present invention is injection-molded, the length of the gate portion of the primary molded body is preferably 2 mm or less, particularly preferably 1 mm or less, and this length can be set to 0 mm. The short gate part of this primary molded body
An injection mold having a valve gate designed for a short gate may be used when designing the valve gate of the injection mold. In the multilayer preform of the present invention, the goal is to effectively reuse the recovered polyester resin, and in order to effectively reuse the recovered polyester resin, the amount of the recovered resin used is the amount of the resin used in the entire preform. It is preferably at least 25% by weight of the resin for effective reuse of the recycled resin.
【００１１】一般に、射出金型を十分に冷却すれば、プ
リフォームの白化は回避されるが、過冷却すると、金型
キャビティ表面が結露して満足な製品が得られない。射
出金型の冷却温度は、成形環境の湿度や温度に左右され
るが、通常１０℃前後に冷却されている。一般に、ＰＥ
Ｔ樹脂からなる射出成形品は、急冷することによって白
化を回避することができる。本発明の多層プリフォーム
は、内側層の肉厚は０．５〜２ｍｍの範囲が好ましい。
一方、外側層の肉厚は０．５〜２．５ｍｍの範囲にする
必要があり、特に０．７〜２ｍｍの範囲が好ましい。外
側層の肉厚が０．５〜２．５ｍｍの範囲内にあれば、外
側層の冷却が十分に行われるため結晶化による白化が生
じない。In general, if the injection mold is sufficiently cooled, whitening of the preform can be avoided, but if it is overcooled, a satisfactory product cannot be obtained due to condensation on the surface of the mold cavity. The cooling temperature of the injection mold depends on the humidity and temperature of the molding environment, but is usually cooled to around 10 ° C. Generally, PE
Injection molded articles made of T resin can be prevented from whitening by quenching. In the multilayer preform of the present invention, the thickness of the inner layer is preferably in the range of 0.5 to 2 mm.
On the other hand, the thickness of the outer layer needs to be in the range of 0.5 to 2.5 mm, and particularly preferably in the range of 0.7 to 2 mm. When the thickness of the outer layer is in the range of 0.5 to 2.5 mm, the outer layer is sufficiently cooled, so that whitening due to crystallization does not occur.
【００１２】内側層の肉厚は特に限定されるものではな
いが、回収ポリエステル樹脂の使用率や成形性等の関係
で０．５〜２ｍｍの範囲が好ましい。一方、外側層の肉
厚は０．５ｍｍ未満では内側層の肉厚とも関連してくる
が、回収ポリエステル樹脂の使用率が２５重量％に達成
しなくなり、リサイクル樹脂の有効再利用の効果が少な
い。また０．５ｍｍ未満の肉厚では射出成形時の樹脂量
が少なく金型内で固化し、樹脂の流れが不良となり成形
が困難となる。一方、外側層の肉厚が２．５ｍｍを超え
ると冷却に時間がかかるため外側層の内側が白化して延
伸ブロー成形用に適した多層プリフォームが得られな
い。The thickness of the inner layer is not particularly limited, but is preferably in the range of 0.5 to 2 mm in view of the usage rate of the recovered polyester resin, moldability, and the like. On the other hand, if the thickness of the outer layer is less than 0.5 mm, it is related to the thickness of the inner layer. However, the usage rate of the recovered polyester resin does not reach 25% by weight, and the effect of effective reuse of the recycled resin is small. . On the other hand, if the thickness is less than 0.5 mm, the amount of resin during injection molding is small, and the resin is solidified in the mold, and the flow of the resin becomes poor and molding becomes difficult. On the other hand, when the thickness of the outer layer exceeds 2.5 mm, it takes a long time for cooling, so that the inside of the outer layer is whitened, and a multilayer preform suitable for stretch blow molding cannot be obtained.
【００１３】さらに、本発明の多層プリフォームは、外
側層を形成する回収ポリエステル樹脂をプリフォームの
開口端部まで形成させることができ、回収ポリエステル
樹脂の使用量を最も大きくできるが、ネックリングま
で、特にネックリングのほぼ半分の位置からネックリン
グの下１０ｍｍの位置の間まで形成させるのがブロー成
形時の層間剥離の発生が防止できることと、回収ポリエ
ステル樹脂の利用率の面から好ましい。外側層をネック
リングより上まで形成すると、回収ポリエステル樹脂の
使用量が多くなるが、２次射出金型を割型にする必要が
あり一方、外側層をネックリングよりかなり下の位置に
形成すると、ブロー成形時に継ぎ目部分から層間剥離が
生じ易くなり、かつ、回収ポリエステル樹脂の使用量が
少なくなって、回収ポリエステル樹脂の使用率が２５重
量％に達しなくなる。Further, in the multilayer preform of the present invention, the recovered polyester resin forming the outer layer can be formed up to the opening end of the preform, and the amount of the recovered polyester resin can be maximized. In particular, it is preferable to form from about half the position of the neck ring to a position 10 mm below the neck ring from the viewpoints of preventing the occurrence of delamination during blow molding and the utilization factor of the recovered polyester resin. If the outer layer is formed above the neck ring, the amount of the recovered polyester resin increases, but it is necessary to make the secondary injection mold a split mold, while if the outer layer is formed considerably below the neck ring, In addition, delamination tends to occur from the seam portion at the time of blow molding, and the amount of the recovered polyester resin used is reduced, so that the usage rate of the recovered polyester resin does not reach 25% by weight.
【００１４】前述したように回収ポリエステル樹脂を再
使用して２次射出成形によりボトル成形用プリフォーム
を成形する際、再使用する回収ポリエステル樹脂の使用
量を多くするために２次射出層である二次成形体の肉厚
を厚肉とすることが有効である。しかしながら外層とな
る回収ポリエステル樹脂の２次射出成形体を厚肉にする
とバージンポリエステル樹脂の１次射出体の胴部を薄肉
としなければならないが、１次射出の胴部を薄くすると
射出時の保圧不足、つまり射出成形された樹脂が固化す
るまで十分な圧を保持することができないため厚肉部分
である口頚部に変形が生じ正確な形状が得られない。こ
の問題を解決するため一次成形体にその胴部から口頚部
の直下に至るリブを配置することによって、一次成形体
の胴部の肉厚を薄肉にすると共に口頚部の変形を防止す
るのに十分な射出圧力を保持する保圧を得ることができ
る。リブは等間隔に配置することが口頚部の変形を防止
するのに有効である。リブは底部から口頚部の直下まで
配置するとリブを設けないものに比べて樹脂流路が拡大
されて、成形中の保圧を直接かつ継続的に口頚部に伝え
ることができるため口頚部の充填密度が高まり、一次成
形体の胴部を薄肉にしても口頚部が変形しないという優
れた効果を奏する。また、リブを底部から胴部の任意位
置まで配置してもリブを設けないものに比べて底部から
胴部に至るまでの樹脂流路が拡大されるため、圧力降下
を防止することができ、口頚部へのほああつを高めるこ
とができる。リブの本数は一次成形体の胴部の肉厚に関
係するが、２本以上配置することが好ましい。胴部に配
置されたリブの形状は外側または内側に凸状、多角形状
の角部、楕円形状の長径先端部のいずれでもよく、この
部分が樹脂流路の拡大及び圧力降下を防止するという優
れた効果を奏する。As described above, when the recycled polyester resin is reused to form a preform for bottle molding by secondary injection molding, the secondary injection layer is used to increase the amount of the recycled polyester resin to be reused. It is effective to increase the thickness of the secondary molded body. However, if the secondary injection molded body of the recovered polyester resin, which is the outer layer, is made thick, the body of the primary injection body of virgin polyester resin must be made thin. Insufficient pressure, that is, sufficient pressure cannot be maintained until the injection-molded resin is solidified, so that the mouth and neck portion, which is a thick portion, is deformed, and an accurate shape cannot be obtained. In order to solve this problem, by arranging a rib on the primary molded body from the body to immediately below the mouth and neck, it is possible to reduce the thickness of the body of the primary molded body and prevent deformation of the mouth and neck. A holding pressure that maintains a sufficient injection pressure can be obtained. It is effective to arrange the ribs at equal intervals to prevent deformation of the mouth and neck. When the ribs are placed from the bottom to just below the mouth and neck, the resin flow path is expanded compared to the case without ribs, and the holding pressure during molding can be directly and continuously transmitted to the mouth and neck, so that the mouth and neck are filled. It has an excellent effect that the density is increased and the mouth and neck are not deformed even if the body of the primary molded body is made thin. Also, since the resin flow path from the bottom to the body is expanded compared to the case where the rib is not provided even if the rib is arranged from the bottom to an arbitrary position of the body, a pressure drop can be prevented, You can increase the cheeks to the mouth and neck. Although the number of ribs is related to the thickness of the body of the primary molded body, it is preferable to arrange two or more ribs. The shape of the ribs arranged on the body may be any of an outwardly or inwardly convex shape, a polygonal corner, and an elliptical long-diameter tip, which is excellent in preventing the resin flow path from expanding and pressure drop. It has the effect.
【００１５】次ぎに、本発明の多層プリフォームの構造
について説明する。図１は、一次成形体１の断面図であ
り、口頚部２、肩部３、胴部４、及び底部５から構成さ
れている。口頚部２の下方にはネックリング６が形成さ
れ、底部５にはゲート部７が形成されるが、ゲート部７
の長さは短くなっている。底部から口頚部２までリブが
等間隔で配置されている。図２は図１の１次射出成形体
のＡ−Ａ線の断面図であって、外周に凸状のリブ８が等
間隔で４本配設されている。Next, the structure of the multilayer preform of the present invention will be described. FIG. 1 is a cross-sectional view of the primary molded body 1, which includes a mouth and neck portion 2, a shoulder portion 3, a trunk portion 4, and a bottom portion 5. A neck ring 6 is formed below the mouth and neck 2 and a gate 7 is formed at the bottom 5.
The length is shorter. Ribs are arranged at equal intervals from the bottom to the mouth and neck 2. FIG. 2 is a cross-sectional view taken along line AA of the primary injection molded article of FIG. 1, and four convex ribs 8 are arranged at equal intervals on the outer periphery.
【００１６】図２は、図１のＡ−Ａ線の断面図であっ
て、一次成形体１の外周に凸状のリブ８が形成されてい
る。多層プリフォーム１は、口頚部２、肩部３、胴部４
及び底部５から構成されており、口頚部２の下方にはネ
ックリング６が形成され、底部５にゲート部７が形成さ
れている。図３は、多層プリフォーム１１の断面図であ
り、口頚部１２、肩部１３、胴部１４及び底部１５から
構成されており、口頚部１２の下方にはネックリング１
６が形成され、底部１５にゲート部１７が形成されてい
る。さらに、多層プリフォーム１１は内側層１８と外側
層１９とからなり、この例では外側層１９の上端はネッ
クリング１６の中間の継ぎ目部分２０で内側層１８と接
合している。図４は図３の多層プリフォームのＢ−Ｂ線
の断面図であって、一次成形体１の外周に形成された凸
状のリブ８が二次成形体に食い込んでいる。図５は他の
実施例であって、一次成形体の外周面に凸状に形成され
たリブが６本等間隔に配置された多層プリフォームの断
面を示す。図６は他の実施例であって、リブ８が一次成
形体の内周面に凸状に形成された例であり、この実施例
ではリブが５本配置されている。図７は１次射出成形体
を内周面を円形とし外周面を楕円形として、外周面の楕
円形の長径先端をリブ８とした実施例である。リブに対
向する二次成形体の外周層は薄肉となっている。図８は
一次成形体の内周面を円形とし、外周面を８角形状とし
た８角形状の先端をリブ８とした実施例である。FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, in which a convex rib 8 is formed on the outer periphery of the primary molded body 1. The multilayer preform 1 includes a mouth, neck 2, shoulder 3, and trunk 4.
A neck ring 6 is formed below the mouth and neck 2, and a gate 7 is formed on the bottom 5. FIG. 3 is a cross-sectional view of the multilayer preform 11, which includes a mouth and neck portion 12, a shoulder portion 13, a body portion 14, and a bottom portion 15. A neck ring 1 is provided below the mouth and neck portion 12.
6 are formed, and a gate portion 17 is formed on the bottom portion 15. Furthermore, the multilayer preform 11 comprises an inner layer 18 and an outer layer 19, in this example the upper end of the outer layer 19 is joined to the inner layer 18 at a seam 20 in the middle of the neck ring 16. FIG. 4 is a cross-sectional view taken along the line BB of the multilayer preform of FIG. 3, in which the convex ribs 8 formed on the outer periphery of the primary molded body 1 bite into the secondary molded body. FIG. 5 shows a cross section of a multilayer preform according to another embodiment, in which six ribs formed in a convex shape on the outer peripheral surface of the primary molded body are arranged at regular intervals. FIG. 6 shows another embodiment in which the ribs 8 are formed in a convex shape on the inner peripheral surface of the primary molded body. In this embodiment, five ribs are arranged. FIG. 7 shows an embodiment in which the primary injection molded body has a circular inner peripheral surface, an elliptical outer peripheral surface, and a rib 8 at the longer end of the elliptical outer peripheral surface. The outer peripheral layer of the secondary molded body facing the rib is thin. FIG. 8 shows an embodiment in which the inner peripheral surface of the primary molded body is circular and the outer peripheral surface is octagonal, and the octagonal tip is a rib 8.
【００１７】次に、本発明の多層プリフォームの製造方
法及び多層容器の製造方法について説明する。二段射出
成形機を用いて、最初にバージンポリエステル樹脂を縦
リブ形成用溝を有する１次金型内に１次射出して縦リブ
付き一次成形体を形成する。１次金型のバルブゲートは
一次成形体のゲート部の長さが２ｍｍ以下、好ましくは
１ｍｍ以下になるように設計されている。次いで、この
一次成形体を１次金型から取り出して２次金型にセット
し、一次成形体の外表面に回収ポリエステル樹脂を２次
射出して外側層を形成して多層プリフォームを製造する
ことができる。本発明に用いられる射出成形方法は多段
射出成形方法に限定されるものではなく、インサート射
出成形方法も採用することができる。また、本発明によ
れば前記多層プリフォームを用いて通常の二軸延伸ブロ
ー成形することにより、内容物に触れる内側層をバージ
ンポリエステル樹脂で形成し、外側層を回収ポリエステ
ル樹脂で形成した多層容器を得ることができる。得られ
た多層容器は、回収ポリエステル樹脂中の不純物の内容
物中への溶出が防止され、また一次成形体の胴部肉厚を
薄くすることができるので回収ポリエステル樹脂の使用
率が増大した。Next, a method for producing a multilayer preform and a method for producing a multilayer container according to the present invention will be described. Using a two-stage injection molding machine, first, a virgin polyester resin is primarily injected into a primary mold having a groove for forming a vertical rib to form a primary molded article having a vertical rib. The valve gate of the primary mold is designed so that the length of the gate portion of the primary molded body is 2 mm or less, preferably 1 mm or less. Next, the primary molded body is taken out of the primary mold and set in a secondary mold, and a recovered polyester resin is secondarily injected onto the outer surface of the primary molded body to form an outer layer, thereby producing a multilayer preform. be able to. The injection molding method used in the present invention is not limited to the multi-stage injection molding method, and an insert injection molding method can also be adopted. Further, according to the present invention, a multilayer container in which the inner layer touching the contents is formed of a virgin polyester resin and the outer layer is formed of a recovered polyester resin by ordinary biaxial stretch blow molding using the multilayer preform. Can be obtained. In the obtained multilayer container, the elution of impurities in the recovered polyester resin into the contents was prevented, and the wall thickness of the primary molded body could be reduced, so that the usage rate of the recovered polyester resin increased.
【００１８】本発明で用いる内側層となるバージンポリ
エステル樹脂としては、ＰＥＴ樹脂が好ましく、他にエ
チレンテレフタレート／エチレンイソフタレート共重合
体、ポリエチレンナフタレート樹脂或いはこれ等の混合
物が使用される。一方、外側層となる回収ポリエステル
樹脂としては、固有粘度（ＩＶ）やジエチレングリコー
ル（ＤＧ）含有量の異なる種々のＰＥＴ樹脂が主体であ
るが、この他にエチレンテレフタレート／エチレンイソ
フタレート共重合体、ポリエチレンナフタレート樹脂あ
るいはそれら混合物等が混入されている。さらに、外側
層となる回収ポリエステル樹脂としては、工場内に発生
するスクラップ樹脂やバージンポリエステル樹脂を必要
量ブレンドした樹脂組成物として用いることができる。The virgin polyester resin serving as the inner layer used in the present invention is preferably a PET resin. In addition, an ethylene terephthalate / ethylene isophthalate copolymer, a polyethylene naphthalate resin or a mixture thereof is used. On the other hand, as the recovered polyester resin to be the outer layer, various PET resins having different intrinsic viscosities (IV) and diethylene glycol (DG) contents are mainly used. In addition, ethylene terephthalate / ethylene isophthalate copolymer, polyethylene A naphthalate resin or a mixture thereof is mixed. Further, as the recovered polyester resin to be the outer layer, a scrap resin or a virgin polyester resin generated in a factory can be used as a resin composition in which a required amount is blended.
【００１９】[0019]
実施例１ 二段射出成形機を用いて、第１射出機に固有粘度が０．
７８、ジエチレングリコール含有量が２．０重量％のバ
ージンポリエチレンテレフタレート樹脂を供給して、成
形温度２８５℃、射出圧力５００Ｋｇ／ｃｍ２で１０℃
に冷却された４本の縦リブ形成用溝を有する１次金型内
に１次射出し、外側に凸状のリブを４本配置した図２の
断面を有しリブ部分を除いた胴部の平均肉厚が１．２ｍ
ｍ、ゲート部の長さが０．４ｍｍの一次成形体を得た。
次いで、第２射出機に回収ポリエステル樹脂を供給し、
１次金型から取り出された一次成形体を１０℃に冷却さ
れた２次金型内にセットし、一次成形体の外表面に回収
ポリエステル樹脂を２次射出して、外側層の胴部の平均
肉厚が２ｍｍの多層プリフォームａを得た。Example 1 Using a two-stage injection molding machine, the first injection machine had an intrinsic viscosity of 0.
78. A virgin polyethylene terephthalate resin having a diethylene glycol content of 2.0% by weight was supplied, and a molding temperature of 285 ° C. and an injection pressure of 500 kg / cm 2 at 10 ° C.
Primary injection into a primary mold having four cooled longitudinal rib forming grooves and four convex ribs arranged on the outside. 1.2m average thickness
m, a primary molded body having a gate length of 0.4 mm was obtained.
Next, the recovered polyester resin is supplied to the second injection machine,
The primary molded body taken out of the primary mold is set in a secondary mold cooled to 10 ° C., and the recovered polyester resin is secondarily injected onto the outer surface of the primary molded body to form a body of the outer layer. A multilayer preform a having an average thickness of 2 mm was obtained.
【００２０】実施例２ リブを６本とした図５の一次成形体を使用し、外側層の
胴部の平均肉厚を１．５ｍｍとした他は実施例１と同様
にして多層プリフォームｂを得た。Example 2 A multilayer preform b was prepared in the same manner as in Example 1 except that the primary molded body of FIG. 5 having six ribs was used, and the average thickness of the outer layer body was 1.5 mm. I got
【００２１】実施例３ リブを５本とした図６の一次成形体を使用し、外側層の
胴部の平均肉厚を２．３ｍｍとした他は実施例１と同様
にして多層プリフォームＣを得た。プリフォームの評価
多層プリフォームａ、ｂ及びｃは、回収ポリエステル樹
脂の使用率がそれぞれ２８％、３５％及び４１％であ
り、また、ＪＩＳ Ｋ−７１０５試験で測定されたくも
り価（ヘイズ）が３０％、３５％及び４０％であり、白
化することもなかった。Example 3 A multilayer preform C was prepared in the same manner as in Example 1 except that the primary molded body shown in FIG. 6 having five ribs was used and the average thickness of the outer layer body was 2.3 mm. I got Evaluation of Preforms The multilayer preforms a, b and c have a usage rate of the recovered polyester resin of 28%, 35% and 41%, respectively, and have a haze value (haze) measured by the JIS K-7105 test. They were 30%, 35% and 40%, and did not whiten.
【００２２】実施例４ 実施例１〜３で得たａ、ｂ、ｃ、の多層プリフォームを
延伸温度１１０℃に加温調温して二軸延伸ブロー成形機
を用いて１００℃に加熱されたブロー金型内で面積延伸
倍率が１２倍、内容積５００ｍｌの多層ボトルＡ、Ｂ及
びＣを成形した。得られた多層ボトルは、外側層の回収
ポリエステル樹脂が白化することも層間剥離することも
なく、１．２ｍの高さからの落下に対しても割れること
もなかった。Example 4 The multilayer preforms a, b and c obtained in Examples 1 to 3 were heated to a stretching temperature of 110 ° C. and heated to 100 ° C. using a biaxial stretch blow molding machine. Multilayer bottles A, B and C having an area stretch ratio of 12 times and an internal volume of 500 ml were molded in a blow mold. In the obtained multilayer bottle, the recovered polyester resin in the outer layer did not whiten or delaminate, and did not crack even when dropped from a height of 1.2 m.
【００２３】比較例１ 共射出成形機を用いて、リブを形成しない第１射出機に
内外層となるバージンポリエチレンテレフタレート樹脂
を供給し、第２射出機に中間層となる回収ポリエステル
樹脂を供給して、成形温度２８５℃、射出圧力５００Ｋ
ｇ／ｃｍ２で１０℃に冷却された射出金型内に射出成形
して、胴部の平均肉厚が４．５ｍｍ、ゲート部の長さが
５ｍｍである２種３層の多層プリフォームｄを得た。多
層プリフォームｄの胴部における内側層及び外側層の平
均肉厚は各１．２ｍｍで、中間層の平均肉厚が０．８ｍ
ｍであった。中間層の肉厚は底部近傍が肉厚になり、口
頚部に向かった次第に肉薄になっており、不均一な肉厚
分布であった。Comparative Example 1 Using a co-injection molding machine, a virgin polyethylene terephthalate resin serving as an inner and outer layer was supplied to a first injector having no ribs, and a recovered polyester resin serving as an intermediate layer was supplied to a second injector. Molding temperature 285 ° C, injection pressure 500K
Injection molding in an injection mold cooled to 10 ° C. at 10 g / cm 2 , and a multi-layer, three-layer preform d having an average body thickness of 4.5 mm and a gate length of 5 mm I got The average thickness of the inner layer and the outer layer in the body of the multilayer preform d is 1.2 mm each, and the average thickness of the intermediate layer is 0.8 m.
m. The thickness of the intermediate layer became thick near the bottom, and gradually became thinner toward the mouth and neck, resulting in an uneven thickness distribution.
【００２４】比較例２ 中間層の平均肉厚を１．６ｍｍとした他は比較例１と同
様にして３層のプリフォームｅを得た。プリフォーム評
価多層プリフォームｄ及びｅは、回収ポリエステル樹脂
の使用率がそれぞれ１５％及び４８％であり、また、ヘ
イズが７５及び９０％であり、かなり白化していた。Comparative Example 2 A three-layer preform e was obtained in the same manner as in Comparative Example 1, except that the average thickness of the intermediate layer was 1.6 mm. Preform evaluation The preforms d and e had a usage rate of the recovered polyester resin of 15% and 48%, respectively, and had a haze of 75 and 90%, and were considerably whitened.
【００２５】比較例３ 比較例１と２で得た多層プリフォームｄとｅを延伸温度
１１０℃に加熱調温して延伸ブロー成形機を用いて１０
０℃に加熱されたブロー金型内で面積延伸倍率が１２
倍、内容積５００ｍｌの多層ボトルＤ及びＥを成形し
た。得られた多層ボトルは、中間層の回収ポリエステル
樹脂が白化して、外観特性が悪く、また中間層の肉厚も
不均一なものであった。Comparative Example 3 The multilayer preforms d and e obtained in Comparative Examples 1 and 2 were heated to a stretching temperature of 110.degree.
Area stretch ratio of 12 in blow mold heated to 0 ° C
Double-layered bottles D and E having an inner volume of 500 ml were molded. In the obtained multilayer bottle, the recovered polyester resin in the intermediate layer was whitened, the appearance characteristics were poor, and the thickness of the intermediate layer was also uneven.
【００２６】比較例４ 二段射出成形機を用いて、第１射出機にバージンポリエ
チレンテレフタレート樹脂を供給して、成形温度２８５
℃、射出圧力５００Ｋｇ／ｃｍ２で１０℃に冷却された
１次金型内に１次射出して、胴部の平均肉厚が１．５ｍ
ｍ、ゲート部の長さが５ｍｍのリブのない一次成形体を
得た。次いで、第２射出機に回収ポリエステル樹脂を供
給し、１次金型から取り出された一次成形体のゲート部
を０．４ｍｍに切断した後、この一次成形体を１０℃に
冷却された２次金型内にセットし、一次成形体の外表面
に回収ポリエステル樹脂を２次射出して、外側層の胴部
の平均肉厚が３ｍｍである２種２層の多層プリフォーム
ｆを得た。プリフォームの評価プリフォームｆは、回収
ポリエステル樹脂の使用率が５０％であり、また、ヘイ
ズが９０％であった。また厚肉の口頚部はヒケによる若
干の変形が発生した。Comparative Example 4 Using a two-stage injection molding machine, virgin polyethylene terephthalate resin was supplied to the first injection machine, and the molding temperature was 285.
Primary injection into a primary mold cooled to 10 ° C. at an injection pressure of 500 kg / cm 2 at 500 ° C., and the average wall thickness of the body is 1.5 m
m, a rib-free primary molded body having a gate portion of 5 mm in length was obtained. Next, the recovered polyester resin is supplied to the second injection machine, and the gate portion of the primary molded product taken out from the primary mold is cut into 0.4 mm, and then the primary molded product is cooled to 10 ° C. It was set in a mold, and the recovered polyester resin was secondarily injected onto the outer surface of the primary molded body to obtain a two-layer, two-layer multilayer preform f having an average thickness of the outer layer body of 3 mm. Evaluation of Preform In preform f, the usage rate of the recovered polyester resin was 50%, and the haze was 90%. The mouth and neck of the thick wall were slightly deformed by sink marks.
【００２７】比較例５ 比較例４で得た多層プリフォームｆを延伸温度１１０℃
に加温調温して二軸延伸ブロー成形機を用いて１００℃
に加熱されたブロー金型内で面積延伸倍率が１２倍、内
容積５００ｍｌの多層ボトルＦを成形した。得られた多
層ボトルは、外側層の回収ポリエステル樹脂内側層側が
白化して、外観特性の悪いものであった。さらに、一次
成形体の底部のゲートカット工程を行っているため、本
発明の１．５倍の成形時間を要した。Comparative Example 5 The multilayer preform f obtained in Comparative Example 4 was stretched at 110 ° C.
And heated to 100 ° C using a biaxial stretch blow molding machine.
A multilayer bottle F having an area stretching ratio of 12 times and an inner volume of 500 ml was formed in a blow mold heated to a temperature of 5 mm. In the obtained multilayer bottle, the outer layer side of the recovered polyester resin inner layer side was whitened, and the appearance characteristics were poor. Further, since the gate cutting step at the bottom of the primary molded body was performed, the molding time required was 1.5 times that of the present invention.
【００２８】[0028]
【発明の効果】本発明は、回収ポリエステル樹脂の使用
量が大きく有効に再利用されると共に、回収ポリエステ
ル樹脂中の不純物が内容物中に溶出せずバージンポリエ
ステル樹脂の一次成形体の寸法精度が安定で変形が生ぜ
ず、外観上白化のない内側層を薄肉にしても口頚部の変
形のない成形品が得られる優れた効果を奏する。According to the present invention, the used amount of the recovered polyester resin is large and the recycled polyester resin is effectively reused, while the impurities in the recovered polyester resin do not elute into the contents, and the dimensional accuracy of the primary molded article of the virgin polyester resin is improved. Even if the inner layer which is stable and does not deform and has no whitening in appearance is thinned, an excellent effect of obtaining a molded article without deformation of the mouth and neck can be obtained.
【図１】本発明の多層プリフォームを成形するための一
次成形体の軸方向の断面図である。FIG. 1 is an axial sectional view of a primary molded body for molding a multilayer preform of the present invention.
【図２】本発明で用いる一次成形体を示す図１のＡ−Ａ
線の断面図である。FIG. 2 shows a primary molded body used in the present invention, which is AA in FIG.
It is sectional drawing of a line.
【図３】本発明の実施例である多層プリフォームの軸方
向の断面図である。FIG. 3 is an axial sectional view of a multilayer preform according to an embodiment of the present invention.
【図４】本発明の実施例である図３のＢ−Ｂ線断面図で
ある。FIG. 4 is a sectional view taken along line BB of FIG. 3, which is an embodiment of the present invention.
【図５】本発明の他の実施例である多層プリフォームの
軸と直交する断面図である。FIG. 5 is a cross-sectional view orthogonal to an axis of a multilayer preform according to another embodiment of the present invention.
【図６】本発明の他の実施例である多層プリフォームの
軸と直交する断面図である。FIG. 6 is a cross-sectional view orthogonal to an axis of a multilayer preform according to another embodiment of the present invention.
【図７】本発明の他の実施例である多層プリフォームの
軸と直交する断面図である。FIG. 7 is a cross-sectional view orthogonal to an axis of a multilayer preform according to another embodiment of the present invention.
【図８】本発明の他の実施例である多層プリフォームの
軸と直交する断面図である。FIG. 8 is a sectional view orthogonal to an axis of a multilayer preform according to another embodiment of the present invention.
１ 一次成形体 ２ 口頚部 ３ 肩部 ４ 胴部 ５ 底部 ６ ネックリング ７ ゲート部 ８ リブ １１ 多層プリフォーム １２ 口頚部 １３ 肩部 １４ 胴部 １５ 底部 １６ ネックリング １７ ゲート部 １８ 内側層 １９ 外側層 ２０ 継ぎ目部分 DESCRIPTION OF SYMBOLS 1 Primary molded body 2 Mouth and neck part 3 Shoulder part 4 Body 5 Bottom part 6 Neck ring 7 Gate part 8 Rib 11 Multilayer preform 12 Neck and neck part 13 Shoulder part 14 Body part 15 Bottom part 16 Neck ring 17 Gate part 18 Inner layer 19 Outer layer 20 seams
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｂ６５Ｄ 1/09 Ｂ６５Ｄ 1/00 Ｃ // Ｂ２９Ｋ 67:00 105:26 Ｂ２９Ｌ 9:00 22:00 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 6 Identification code FI B65D 1/09 B65D 1/00 C // B29K 67:00 105: 26 B29L 9:00 22:00
Claims (10)
形用多層プリフォームであって、内側層がバージンポリ
エステル樹脂を１次射出して形成した一次成形体であ
り、外側層が回収ポリエステル樹脂を一次成形体の外表
面に２次射出して成形した二次成形体である少なくとも
２層構造からなり、外側層の肉厚が０．５〜２．５ｍｍ
であり、一次成形体の胴部に底部から口頚部に至るリブ
を配置したことを特徴とする回収ポリエステル樹脂層を
有する多層プリフォーム。1. A multilayer preform for stretch blow molding comprising an inner layer and an outer layer, wherein the inner layer is a primary molded article formed by primary injection of a virgin polyester resin, and the outer layer is a recovered polyester resin. Has a two-layer structure, which is a secondary molded body formed by secondary injection onto the outer surface of the primary molded body, and the outer layer has a thickness of 0.5 to 2.5 mm.
A multilayer preform having a recovered polyester resin layer, wherein ribs from the bottom to the mouth and neck are arranged on the body of the primary molded body.
分で０．５〜２ｍｍである、請求項１に記載された回収
ポリエステル樹脂層を有する多層プリフォーム。2. The multilayer preform having a recovered polyester resin layer according to claim 1, wherein the thickness of the body portion of the primary molded body is 0.5 to 2 mm at a portion other than the rib.
部から口頚部の直下まで延びている、請求項１に記載さ
れた回収ポリエステル樹脂層を有する多層プリフォー
ム。3. The multilayer preform having a recovered polyester resin layer according to claim 1, wherein a rib disposed on a body portion of the primary molded body extends from a bottom portion to a position immediately below a mouth and neck portion.
部から胴部の途中まで延びている、請求項１に記載され
た回収ポリエステル樹脂層を有する多層プリフォーム。4. The multilayer preform having a recovered polyester resin layer according to claim 1, wherein the rib disposed on the body of the primary molded body extends from the bottom to the middle of the body.
間隔で複数本配置されている、請求項１に記載された回
収ポリエステル樹脂層を有する多層プリフォーム。5. The multilayer preform having a recovered polyester resin layer according to claim 1, wherein a plurality of ribs arranged on the body of the primary molded body are arranged at equal intervals.
側または内側に凸状、多角形状胴部の角部、楕円形状胴
部の長径先端部のいずれかである、請求項１に記載され
た回収ポリエステル樹脂層を有する多層プリフォーム。6. The method according to claim 1, wherein the rib disposed on the body of the primary molded body is any one of a convex portion outwardly or inwardly, a corner of a polygonal body, and a major end of an elliptical body. A multilayer preform having the described recovered polyester resin layer.
リフォーム全体の樹脂の使用量の２５重量％以上であ
る、請求項１に記載された回収ポリエステル樹脂層を有
する多層プリフォーム。7. The multilayer preform having a recovered polyester resin layer according to claim 1, wherein the amount of the recovered polyester resin used is 25% by weight or more of the amount of the resin used in the entire multilayer preform.
らバージンポリエステル樹脂を１次金型内に１次射出し
て胴部の底部から口頚部に至るリブを配置した一次成形
体を形成し、次いで内側層となる一次成形体を２次金型
内にセットして一次成形体の外表面に第２射出機から回
収ポリエステル樹脂を２次射出し外側層を形成すること
を特徴とする回収ポリエステル樹脂層を有する多層プリ
フォームの製造方法。8. A primary molded article in which virgin polyester resin is first injected from a first injection machine into a primary mold using an injection molding machine, and ribs from the bottom of the body to the mouth and neck are arranged. Forming, then, setting the primary molded body to be the inner layer in a secondary mold, and secondary injection of the recovered polyester resin from the second injection machine to the outer surface of the primary molded body to form the outer layer. Of producing a multilayer preform having a recovered polyester resin layer.
１ｍｍ以下である、請求項８に記載された回収ポリエス
テル樹脂層を有する多層プリフォームの製造方法。9. The method for producing a multilayer preform having a recovered polyester resin layer according to claim 8, wherein the length of the gate portion of the primary molded body of the inner layer is 1 mm or less.
記載された回収ポリエステル樹脂層を有する多層プリフ
ォームを用いて延伸ブロー成形された、外側層が回収ポ
リエステル樹脂、内側層がバージンポリエステル樹脂で
形成されており、内側層にリブが形成されている回収ポ
リエステル樹脂の使用量が容器全体の樹脂使用量の２５
重量％以上である回収ポリエステル樹脂層を有する多層
容器。10. An outer layer and a virgin polyester resin, wherein the outer layer is stretch blow-molded using the multilayer preform having the recovered polyester resin layer according to any one of claims 1 to 11, and the inner layer is a virgin polyester resin. And the amount of recovered polyester resin having ribs formed on the inner layer is 25% of the amount of resin used in the entire container.
A multilayer container having a recovered polyester resin layer in an amount of not less than% by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9291465A JPH1190975A (en) | 1997-09-18 | 1997-09-18 | Multilayer preform with recovery polyester resin layer, manufacture of the preform, and multilayer container molded from the preform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9291465A JPH1190975A (en) | 1997-09-18 | 1997-09-18 | Multilayer preform with recovery polyester resin layer, manufacture of the preform, and multilayer container molded from the preform |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1190975A true JPH1190975A (en) | 1999-04-06 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9291465A Pending JPH1190975A (en) | 1997-09-18 | 1997-09-18 | Multilayer preform with recovery polyester resin layer, manufacture of the preform, and multilayer container molded from the preform |
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| Country | Link |
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| JP (1) | JPH1190975A (en) |
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| JPH11192656A (en) * | 1997-12-29 | 1999-07-21 | Nihon Yamamura Glass Co Ltd | Multilayer-preform, its molding method, and multilayer-bottle |
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| JP2002361717A (en) * | 2001-06-13 | 2002-12-18 | Toppan Printing Co Ltd | Manufacturing method of two-layer preform |
| JP2004511358A (en) * | 2000-09-05 | 2004-04-15 | アドバンスド プラスティックス テクノロジーズ リミテッド | Multilayer containers and preforms with barrier properties using recycled materials |
| US7261551B2 (en) | 1997-10-17 | 2007-08-28 | Advanced Plastics Technologies Luxembourg S.A. | Preform molds incorporating high heat conductivity material |
| WO2007101879A1 (en) * | 2006-03-08 | 2007-09-13 | Sa Des Eaux Minerales D'evian Saeme | Injecting/blowing device for making a thin wall component and corresponding method |
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| US7303387B2 (en) | 2004-06-10 | 2007-12-04 | Advanced Plastics Technologies Luxembourg S.A. | System for controlling mold temperatures |
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| US7588808B2 (en) | 2004-04-16 | 2009-09-15 | Advanced Plastics Technologies Luxembourg S.A. | Mono and multi-layer articles and injection molding methods of making the same |
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1997
- 1997-09-18 JP JP9291465A patent/JPH1190975A/en active Pending
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