JP2878213B2 - How to Recycle Synthetic Resin Containers - Google Patents
How to Recycle Synthetic Resin ContainersInfo
- Publication number
- JP2878213B2 JP2878213B2 JP30081796A JP30081796A JP2878213B2 JP 2878213 B2 JP2878213 B2 JP 2878213B2 JP 30081796 A JP30081796 A JP 30081796A JP 30081796 A JP30081796 A JP 30081796A JP 2878213 B2 JP2878213 B2 JP 2878213B2
- Authority
- JP
- Japan
- Prior art keywords
- synthetic resin
- pet
- intrinsic viscosity
- containers
- flakes
- 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
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
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/18—Feeding the material into the injection moulding apparatus, i.e. feeding the non-plastified material into the injection unit
- B29C45/1816—Feeding auxiliary material, e.g. colouring material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/0026—Recovery of plastics or other constituents of waste material containing plastics by agglomeration or compacting
-
- 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
- B29C45/0001—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor characterised by the choice of material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
Description
【0001】[0001]
【発明の属する技術分野】この発明は、合成樹脂製容器
のリサイクル方法に関し、特に、使用済みポリエチレン
・テレフタレート(以下、PETという)製容器のリサ
イクル方法であって、使用済みPETボトルを粉砕した
PETフレークを原料としてシートに加工し、このPE
Tシートより卵パックや生鮮食品を入れる容器を製造す
るPETのリサイクル方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recycling a synthetic resin container, and more particularly to a method for recycling a used polyethylene terephthalate (hereinafter referred to as "PET") container. The flakes are processed into a sheet as a raw material, and this PE
The present invention relates to a PET recycling method for manufacturing a container for storing an egg pack or fresh food from a T sheet.
【0002】[0002]
【従来の技術】清涼飲料、液体調味料、お茶、ミネラル
ウオータなどをPETボトルに入れて販売されている
が、使用済みPETボトルの多量発生およびその後始末
が社会問題になっていることは周知の事実である。2. Description of the Related Art Soft drinks, liquid seasonings, tea, mineral water and the like are sold in PET bottles, but it is well known that the occurrence of large quantities of used PET bottles and their subsequent disposal are social problems. It is a fact.
【0003】PETは、加熱・熔融させてリサイクルす
るごとに、分子切断が生じて分子量が低下し、固有粘度
(intrinsic viscosity:IV値と呼ばれている)が低
下して強度も低下する。[0003] Every time PET is heated and melted and recycled, it undergoes molecular breakage, resulting in a decrease in molecular weight, a decrease in intrinsic viscosity (called IV value), and a decrease in strength.
【0004】PETボトルに入れる液体の種類によっ
て、PETボトルの原材料が異なっている。すなわち、
バージン・ペレットは固有粘度が高いので、バージン・
ペレットで作ったPETボトルは、丈夫でガス・バリア
性がよく、ガス抜けをしないから、ガスを発生する炭酸
飲料などの容器として利用されている。また、使用済み
PETボトルから作った再生ペレットは固有粘度が低い
ので、このような再生ペレットで作ったPETボトル
は、ガスを発生しないミネラルウオータ、お茶などの容
器として利用されている。[0004] Raw materials for the PET bottle differ depending on the type of liquid put in the PET bottle. That is,
Virgin pellets have a high intrinsic viscosity,
PET bottles made of pellets are durable, have good gas barrier properties, and do not leak gas, and are therefore used as containers for carbonated beverages that generate gas. In addition, since recycled pellets made from used PET bottles have low intrinsic viscosity, PET bottles made from such recycled pellets are used as containers for mineral water, tea, etc., which do not generate gas.
【0005】[0005]
【発明が解決しようとする課題】回収した使用済みPE
Tボトルには、種々の用途であったPETボトルが含ま
れている。すなわち、固有粘度が異なるPETが含まれ
ているので、固有粘度の低いPETを多く含有する場合
には、シートに加工しても固有粘度が低く、この固有粘
度の低いPETシートを真空成型またはブロー成型して
トレー状の容器を作る際に破れることがあり、製品の歩
留まりが悪かった。SUMMARY OF THE INVENTION Recovered used PE
T bottles include PET bottles that have been used for various purposes. That is, since PETs having different intrinsic viscosities are contained, when a large amount of PET having a low intrinsic viscosity is contained, the intrinsic viscosity is low even when processed into a sheet. The product could be broken when it was molded into a tray-shaped container, resulting in poor product yield.
【0006】また、使用済みPETボトルをリサイクル
する際には、射出成型機において原材料の流動性をよく
するために、PETボトルをペレットに加工してから最
終製品に加工していた。しかし、PETは、加熱するご
とにその固有粘度が低下するので、良質の製品を得るに
は、加熱・熔融の回数をできるだけ少なくすることが重
要である。Further, when recycling used PET bottles, the PET bottles are processed into pellets and then processed into final products in order to improve the flowability of raw materials in an injection molding machine. However, since the intrinsic viscosity of PET decreases with each heating, it is important to minimize the number of times of heating and melting in order to obtain a good quality product.
【0007】そこで、この発明は、固有粘度が異なるP
ETよりなる再生PETから、ほぼ同じ品質のトレー状
の容器を作ること、および、PETの加熱・熔融の回数
をできるだけ減らして、リサイクルしてもPETの品
質、特に固有粘度を低下させないことを目的として考え
られたものである。[0007] Therefore, the present invention provides a method for producing P
To produce tray-like containers of almost the same quality from recycled PET made of ET, and to reduce the number of times of heating and melting of PET as much as possible so that even if recycled, the quality of PET, especially the intrinsic viscosity, does not decrease. It was thought as.
【0008】[0008]
【課題を解決するための手段】この発明の合成樹脂製容
器のリサイクル方法は、回収した同質の合成樹脂製容器
をその固有粘度ごとに分類する工程と、分類された上記
合成樹脂製容器を合成樹脂フレークに粉砕する工程と、
固有粘度が異なる上記合成樹脂フレークの配合割合を変
えて所定の平均固有粘度に調整する工程と、所定の平均
固有粘度に調整された上記合成樹脂フレークを加熱・熔
融して成型する工程とよりなる。According to the present invention, there is provided a method of recycling a synthetic resin container, comprising the steps of: classifying the collected synthetic resin containers by their intrinsic viscosities; and synthesizing the classified synthetic resin containers. Grinding into resin flakes,
A step of adjusting the blending ratio of the synthetic resin flakes having different intrinsic viscosities to a predetermined average intrinsic viscosity, and a step of heating, melting and molding the synthetic resin flakes adjusted to a predetermined average intrinsic viscosity. .
【0009】[0009]
【発明の実施の形態】この発明のPETボトルのリサイ
クル方法は、炭酸飲料などの容器として利用されていた
固有粘度の高いPETボトルと、お茶やミネラルウオー
タの容器として利用されていた固有粘度の低いPETボ
トルのように、使用済みPETボトルを回収ルートごと
に分類して、PETの平均固有粘度を季節ごとに予め調
べておく。BEST MODE FOR CARRYING OUT THE INVENTION The PET bottle recycling method of the present invention comprises a PET bottle having a high intrinsic viscosity used as a container for carbonated beverages, and a PET bottle having a low intrinsic viscosity used as a container for tea and mineral water. Like PET bottles, used PET bottles are classified for each collection route, and the average intrinsic viscosity of PET is checked in advance for each season.
【0010】使用済みPETボトルを回収ルートごとに
粉砕して、固有粘度ごとに分類されたPETフレークを
作る。[0010] Used PET bottles are crushed for each collection route to produce PET flakes classified according to intrinsic viscosity.
【0011】次の製品の製造に適した平均固有粘度とな
るように、固有粘度が異なるPETフレークの配合割合
を変えて所望の平均固有粘度に調整して混合する。この
とき、所望の平均固有粘度が得られない場合には、固有
粘度の高いバージン・ペレットを混入する。The blending ratio of PET flakes having different intrinsic viscosities is adjusted to a desired average intrinsic viscosity and mixed so that the average intrinsic viscosity suitable for the production of the next product is obtained. At this time, if a desired average intrinsic viscosity cannot be obtained, virgin pellets having a high intrinsic viscosity are mixed.
【0012】このようにして混合したPETフレークを
射出成型機のホッパーより投入し、加熱・熔融してダイ
スより押し出し、ローラによってシートに成型する。P
ETフレークは、PETペレットに比べて流動性が悪い
ので、PETフレークを処理する射出成型機としては、
ペレットを処理する装置よりもホッパーの投入口を大き
くした装置を使用する。The PET flakes thus mixed are put into a hopper of an injection molding machine, heated and melted, extruded from a die, and formed into a sheet by a roller. P
ET flakes have lower fluidity than PET pellets, so as an injection molding machine for processing PET flakes,
Use a device with a larger hopper inlet than the device that processes the pellets.
【0013】成型されたPETシートは、そのまま次の
成型工程に導いてもよく、また、ロール状に巻取って保
管し、次の成型に使用される。The molded PET sheet may be directly led to the next molding step, or it may be wound up in a roll and stored, and used for the next molding.
【0014】このようにして、使用済みPETボトルの
固有粘度を調整して作ったPETシートを軟化温度まで
加熱して、真空成型またはブロー成型して卵パックや生
鮮食品を入れるリサイクル容器を成型する。[0014] The PET sheet produced by adjusting the intrinsic viscosity of the used PET bottle in this way is heated to the softening temperature and vacuum-molded or blow-molded to mold a recycle container for storing egg packs and fresh foods. .
【0015】以上の実施の形態においては、使用済みP
ETボトルをリサイクルする方法を例にあげて説明した
が、他の同質の合成樹脂製容器のリサイクルにも適用す
ることができる。In the above embodiment, the used P
Although the method of recycling an ET bottle has been described as an example, the present invention can be applied to the recycling of other synthetic resin containers of the same quality .
【0016】[0016]
【発明の効果】以上の実施の形態に基づく説明から明ら
かなように、この発明によると、使用済みPETボトル
を粉砕したPETフレークをペレットに加工することな
く、そのまま射出成型機に投入してPETシートに成型
するので加熱・熔融の回数を減らすことができ、固有粘
度の低下を防ぐことができる。As is clear from the description based on the above embodiment, according to the present invention, a PET flake obtained by pulverizing a used PET bottle is put into an injection molding machine as it is without being processed into pellets. Since it is molded into a sheet, the number of times of heating and melting can be reduced, and a decrease in intrinsic viscosity can be prevented.
【0017】また、回収した使用済みPETボトルに固
有粘度が異なるPETが含まれていても、次の製品の製
造に適した平均固有粘度となるように、固有粘度が異な
るPETフレークの配合割合を変えて所望の平均固有粘
度に調整するので、リサイクル製品の品質を一定化する
ことができる。Even if the collected used PET bottles contain PETs having different intrinsic viscosities, the mixing ratio of the PET flakes having different intrinsic viscosities is adjusted so that the average intrinsic viscosity suitable for the production of the next product is obtained. Since the average viscosity is adjusted to a desired value, the quality of the recycled product can be kept constant.
Claims (1)
有粘度ごとに分類する工程と、 分類された上記合成樹脂製容器を合成樹脂フレークに粉
砕する工程と、 固有粘度が異なる上記合成樹脂フレークの配合割合を変
えて所定の平均固有粘度に調整する工程と、 所定の平均固有粘度に調整された上記合成樹脂フレーク
を加熱・熔融して成型する工程とよりなることを特徴と
する合成樹脂製容器のリサイクル方法。A step of classifying the collected synthetic resin containers of the same quality according to their intrinsic viscosities; a step of crushing the classified synthetic resin containers into synthetic resin flakes; A step of adjusting the blending ratio of the synthetic resin to a predetermined average intrinsic viscosity, and a step of heating, melting, and molding the synthetic resin flake adjusted to the predetermined average intrinsic viscosity. How to recycle containers.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP30081796A JP2878213B2 (en) | 1996-10-28 | 1996-10-28 | How to Recycle Synthetic Resin Containers |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP30081796A JP2878213B2 (en) | 1996-10-28 | 1996-10-28 | How to Recycle Synthetic Resin Containers |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH10128748A JPH10128748A (en) | 1998-05-19 |
JP2878213B2 true JP2878213B2 (en) | 1999-04-05 |
Family
ID=17889470
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP30081796A Expired - Lifetime JP2878213B2 (en) | 1996-10-28 | 1996-10-28 | How to Recycle Synthetic Resin Containers |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2878213B2 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6284808B1 (en) * | 1997-02-03 | 2001-09-04 | Illinois Tool Works Inc. | Inline solid state polymerization of PET flakes for manufacturing plastic strap by removing non-crystalline materials from recycled PET |
CA2284965C (en) * | 1998-11-13 | 2003-07-08 | Illinois Tool Works Inc. | Inline solid state polymerization of pet flakes for manufacturing plastic strap |
US20090213682A1 (en) | 2008-02-21 | 2009-08-27 | Husky Injection Molding Systems Ltd. | Method of Decreasing Acetaldehyde Level in a Molded Article |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5729424A (en) * | 1980-07-29 | 1982-02-17 | Toyobo Co Ltd | Method of reclamation of waste plastic container |
JPH01148517A (en) * | 1987-12-07 | 1989-06-09 | C R:Kk | Method for disposing used plastic bottle |
JP3485621B2 (en) * | 1994-03-22 | 2004-01-13 | 株式会社松井製作所 | Method for reusing non-product resin in resin molding system and resin molding system |
-
1996
- 1996-10-28 JP JP30081796A patent/JP2878213B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH10128748A (en) | 1998-05-19 |
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