JPH10258425A - Method for granulating granular matter of polyethylene and polypropylene from waste plastic - Google Patents

Method for granulating granular matter of polyethylene and polypropylene from waste plastic

Info

Publication number
JPH10258425A
JPH10258425A JP6839397A JP6839397A JPH10258425A JP H10258425 A JPH10258425 A JP H10258425A JP 6839397 A JP6839397 A JP 6839397A JP 6839397 A JP6839397 A JP 6839397A JP H10258425 A JPH10258425 A JP H10258425A
Authority
JP
Japan
Prior art keywords
specific gravity
plastic
polyethylene
polypropylene
matter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP6839397A
Other languages
Japanese (ja)
Inventor
Shigeki Yamazaki
茂樹 山崎
Toshihiko Iwasaki
敏彦 岩▲崎▼
Keiichi Okuyama
契一 奥山
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Engineering Corp
Original Assignee
NKK Corp
Nippon Kokan Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NKK Corp, Nippon Kokan Ltd filed Critical NKK Corp
Priority to JP6839397A priority Critical patent/JPH10258425A/en
Publication of JPH10258425A publication Critical patent/JPH10258425A/en
Pending legal-status Critical Current

Links

Classifications

    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/62Plastics recycling; Rubber recycling

Landscapes

  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

PROBLEM TO BE SOLVED: To granulate granular matter of PE and PP by separating chlorine-containing plastic and PE and PP from waste plastic. SOLUTION: A film-like plastic is charged in a charging hopper 1 to be crushed into a particle size of 50 mm or less by a crusher 2 and the crushed plastic is transferred to a washing and mixing tank 4 by a blower 3. The crushed plastic is stirred by a stirrer 5 within the washing and mixing tank and, during this period, PE and PP are heated to melting points thereof or higher by a specific gravity soln. composed of a urea aq. soln. (urea:water = 10:1) heated to 190 deg.C to be melted to become liquid droplet matter. The liquid droplet matter of PE and PP mixed by the stirrer 5 and other chlorine-containing plastic (PVC) pieces are transferred to a separation tank 7 by a pump 6 and the liquid droplet matter of PE and PP low in specific gravity is separated from the chlorinecontaining plastic high in specific gravity within the separation tank 7 to rise and cooled to below the melting point thereof in a cooling pipe 8 to be molded and granulated into granular matter with a particle size of 6mm or less. The granular matter is separated from the specific gravity soln. by a vibration screen 9. The chlorine-containing plastic pieces separated from PP and PE are discharged from the lower part of the separation tank 7.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】この発明は、廃棄物から分離
したプラスチック系廃棄物(以下、「廃プラスチック」
という)から塩素含有プラスチック〔PVC(ポリ塩化
ビニル)およびPVDC(ポリ塩化ビニリデン)等〕と
PE(ポリエチレン)およびPP(ポリプロピレン)と
を分離し、分離したPEおよびPPを鉄源の還元剤とし
てマテリアルリサイクルに適した粒状物に造粒するため
の方法に関するものである。
The present invention relates to a plastic waste separated from waste (hereinafter referred to as "waste plastic").
) From chlorine-containing plastics (such as PVC (polyvinyl chloride) and PVDC (polyvinylidene chloride)) and PE (polyethylene) and PP (polypropylene), and using the separated PE and PP as reducing agents for iron sources. The present invention relates to a method for forming granules suitable for recycling.

【0002】[0002]

【従来の技術】プラスチックは、多種類のものが開発さ
れ、年々その使用量が増加している。これらの合成プラ
スチックの中で自然界において生分解されるものは殆ど
無いため、使用済みの廃プラスチックは、回収利用され
る場合を除いて、大部分が他の廃棄物と一緒に埋立て処
分または焼却処分されている。廃棄物中の廃プラスチッ
クを埋立て処分するには、容積率が大きいため広大な土
地を必要とする問題がある。一方、廃プラスチックを焼
却処理すると、塩素含有プラスチックが熱分解して有毒
な塩化水素ガスを排出し、また、廃プラスチックを鉄源
の還元剤としてマテリアルリサイクルに供する場合に
は、プラスチック中の塩素含有プラスチックの許容含有
率を1%以下に低減させる必要があり、廃プラスチック
から塩素含有プラスチックを分離し除去する必要があ
る。
2. Description of the Related Art Various types of plastics have been developed, and their use is increasing year by year. Most of these synthetic plastics are not biodegradable in nature, and most of the used waste plastics are landfilled or incinerated with other wastes, except when collected and reused. Has been disposed of. Landfilling waste plastic in waste requires a large amount of land due to its large volume ratio. On the other hand, when waste plastics are incinerated, chlorine-containing plastics are thermally decomposed to release toxic hydrogen chloride gas, and when waste plastics are used as a reducing agent for iron sources for material recycling, chlorine-containing plastics are used. It is necessary to reduce the allowable content of plastic to 1% or less, and it is necessary to separate and remove chlorine-containing plastic from waste plastic.

【0003】塩素含有プラスチックの分離方法には、シ
ンクフロート、液体サイクロン、湿式縦型分離装置およ
び遠心分離装置などによる湿式比重分離方法と、近赤外
線やX線の吸収差を利用して塩素含有プラスチックを識
別し、エアー等ではじき飛ばすなどして分離する乾式分
離方法とが知られている。
[0003] There are two methods of separating chlorine-containing plastics: a wet specific gravity separation method using a sink float, a liquid cyclone, a wet vertical separator, a centrifugal separator, and the like; and a chlorine-containing plastic using a near infrared ray or X-ray absorption difference. There is known a dry separation method in which the air is separated and separated by flicking with air or the like.

【0004】しかしながら、湿式比重分離方法では比重
差がないPET(ポリエチレンテレフタレート)と、P
VCおよびPVDCとを分離することは不可能である。
また、PS(ポリスチレン)を浮上分離させるためには
比重1.2程度の重液を使用しなくてはならない。
However, in the wet specific gravity separation method, PET (polyethylene terephthalate), which has no specific gravity difference,
It is not possible to separate VC and PVDC.
Further, in order to float and separate PS (polystyrene), a heavy liquid having a specific gravity of about 1.2 must be used.

【0005】一方、乾式分離では、フィルム系プラスチ
ックは整列が困難であり、処理量が低いといった問題が
ある。
[0005] On the other hand, in the case of dry separation, there is a problem that film plastics are difficult to align and the throughput is low.

【0006】[0006]

【発明が解決しようとする課題】廃プラスチックを高炉
原料として供するためには6mm以下の粒径を有する粒
状物に成形する必要がある。特に、フィルム系のプラス
チック、即ち、フィルム、シート、袋およびトレー等を
粒状物に成形するためには、溶融および造粒工程が必要
である。
In order to use waste plastic as a raw material for a blast furnace, it is necessary to form the waste plastic into a granular material having a particle size of 6 mm or less. In particular, in order to form film-based plastics, that is, films, sheets, bags, trays, and the like into granules, a melting and granulating process is required.

【0007】また、比重分離装置によってプラスチック
の比重分離を行うためにはプラスチックの溶融が必要で
あり、溶融をするためにプラスチックの融点以上の高温
の比重液が必要である。しかしながら、例えば、180
℃の比重液を水によりつくりだすためには、約10kg
/cm2 の圧力が必要であるといった問題がある。そし
て、それには、加圧装置の設備が必要である。
[0007] Further, in order to perform the specific gravity separation of the plastic by the specific gravity separation device, it is necessary to melt the plastic. However, for example, 180
Approximately 10 kg
/ Cm 2 is required. And that requires equipment for the pressurizing device.

【0008】従って、この発明の目的は、比重液を用い
る比重分離装置を使用し、PEおよびPPと塩素含有プ
ラスチックとを比重分離し、PEおよびPPを鉄源の還
元剤としてマテリアルリサイクルに適した粒状物に造粒
する工程において、比重液を所定の高圧で加圧すること
無しにプラスチックの溶融可能な所定の高温とし廃プラ
スチックからPEおよびPPを分離しそして効率良く造
粒することができる方法を提供することにある。
Accordingly, an object of the present invention is to use a specific gravity separator using a specific gravity liquid to separate PE and PP from chlorine-containing plastics, and to use PE and PP as a reducing agent for an iron source, which is suitable for material recycling. In the step of granulating into granules, a method capable of separating PE and PP from waste plastics and efficiently granulating them by setting the specific gravity liquid to a predetermined high temperature at which the plastic can be melted without pressurizing the specific gravity liquid at a predetermined high pressure. To provide.

【0009】[0009]

【課題を解決するための手段】請求項1記載の発明は、
比重分離装置の比重液として尿素を所定量含有する水溶
液を用い、前記比重分離装置に廃プラスチックを投入
し、前記比重液をポリエチレンおよびポリプロピレンの
融点以上に加熱して前記廃プラスチックに含まれるポリ
エチレンおよびポリプロピレンを溶融し比重分離によっ
て前記廃プラスチックからポリエチレンおよびポリプロ
ピレンを分離するとともに分離した溶融状態の前記ポリ
エチレンおよびポリプロピレンを冷却して所定の粒径を
有する粒状物に成形することに特徴を有するものであ
る。
According to the first aspect of the present invention,
Using an aqueous solution containing a predetermined amount of urea as a specific gravity liquid of the specific gravity separation device, throwing waste plastic into the specific gravity separation device, heating the specific gravity liquid to a melting point of polyethylene or polypropylene or higher and polyethylene contained in the waste plastic and It is characterized in that the polypropylene is melted and polyethylene and polypropylene are separated from the waste plastic by specific gravity separation, and the separated polyethylene and polypropylene in a molten state are cooled and formed into granules having a predetermined particle size. .

【0010】上記課題は、比重分離装置の比重液として
尿素を添加した水溶液を使用することによって解決され
る。比重分離装置の比重液として尿素を含有する水溶液
を用いることにより、加圧装置による加圧工程無しに所
定の高温の比重液が得られる。
[0010] The above problem is solved by using an aqueous solution to which urea is added as a specific gravity liquid of a specific gravity separation device. By using an aqueous solution containing urea as a specific gravity liquid of the specific gravity separation device, a specific high-temperature specific gravity liquid can be obtained without a pressurizing step by a pressurizing device.

【0011】PEは、比重が約0.9、PPは、比重が
約0.95、塩素含有プラスチック(PVC、PVD
C)は、比重が約1.4である。また、PEは、融点が
108〜135℃、PPは、融点が168〜170℃、
塩素含有プラスチック(PVC、PVDC)は、融点が
200〜210℃である。
[0011] PE has a specific gravity of about 0.9, PP has a specific gravity of about 0.95, and chlorine-containing plastics (PVC, PVD).
C) has a specific gravity of about 1.4. Further, PE has a melting point of 108 to 135 ° C, PP has a melting point of 168 to 170 ° C,
Chlorine-containing plastics (PVC, PVDC) have a melting point of 200 to 210 ° C.

【0012】尿素は、分子量が60.06であり、比重
が1.32であり、例えば、水1に対して10の尿素を
加えた水溶液を比重液として使用すれば、比重が約1.
3となり、沸点が約190℃の比重液が調製できる。
Urea has a molecular weight of 60.06 and a specific gravity of 1.32. For example, when an aqueous solution obtained by adding 10 ureas to 1 water is used as a specific gravity liquid, the specific gravity is about 1.
3 and a specific gravity liquid having a boiling point of about 190 ° C. can be prepared.

【0013】尿素を含有する水溶液からなる比重液を用
いた比重分離装置において、融点より高温の比重液を使
用することによって廃プラスチックに含まれているPE
およびPPは溶融し、比重液中で粒状の液滴となる。こ
れを排出時に冷却することにより、PEおよびPPは成
形造粒され粒状物として回収される。且つ、PEおよび
PPは比重差による比重分離によって比重の大きい塩素
含有プラスチックと分離される。
In a specific gravity separation apparatus using a specific gravity liquid composed of an aqueous solution containing urea, a specific gravity liquid having a temperature higher than the melting point is used to remove PE contained in waste plastic.
And PP melt and become granular droplets in the specific gravity liquid. By cooling this at the time of discharge, PE and PP are formed and granulated and collected as granules. Further, PE and PP are separated from the chlorine-containing plastic having a large specific gravity by specific gravity separation based on a specific gravity difference.

【0014】[0014]

【発明の実施の形態】次に、この発明の実施の形態を説
明する。図1は、この発明の実施の形態に係る装置構成
を示す工程図である。図1に示すように、本実施の形態
は、一般廃棄物から分離された廃プラスチックを、所定
の方法によりフィルム系プラスチックとボトル系プラス
チックとに更に分離し、そして、分離したフィルム系プ
ラスチックを処理する方法である。
Next, an embodiment of the present invention will be described. FIG. 1 is a process diagram showing a device configuration according to an embodiment of the present invention. As shown in FIG. 1, in the present embodiment, waste plastic separated from general waste is further separated into a film plastic and a bottle plastic by a predetermined method, and the separated film plastic is treated. How to

【0015】一般廃棄物から分離されたフィルム系プラ
スチックは投入ホッパ1に投入され、破砕機2によって
50mm以下に破砕される。次いで、ブロワ3によって
洗浄、混合槽4に移送され、洗浄、混合槽4内で攪拌機
5により攪拌されながら同時に190℃に加熱された尿
素水溶液(尿素:水=10:1)からなる比重液によっ
て、PE(ポリエチレン)およびPP(ポリプロピレ
ン)が融点以上に加熱され溶融し液滴になる。前記のP
EおよびPPの液滴物とその他のプラスチック(塩素含
有プラスチック)片は、ポンプ6により分離槽7に移送
され、分離槽7内で低比重のPEおよびPPの液滴物は
比重差によって高比重の塩素含有プラスチック(PVC
およびPVDC)と分離し上昇する。更に、前記液滴物
は、冷却管8内でその融点未満に冷却されて6mm以下
の粒径の粒状物に成形造粒される。造粒された粒状物
は、振動篩9によって比重液から分離される。また、分
離された比重液(尿素水溶液)は、比重液水槽10に戻
され、前記水槽10内のヒーター11によって再び昇温
され、ポンプ12によって洗浄され、混合槽4に戻され
る。
[0015] The film-based plastic separated from the general waste is charged into a charging hopper 1 and crushed by a crusher 2 to 50 mm or less. Then, it is washed by a blower 3 and transferred to a mixing tank 4. The specific gravity of an aqueous urea solution (urea: water = 10: 1) heated to 190 ° C. while being stirred by a stirrer 5 in the washing and mixing tank 4 at the same time. , PE (polyethylene) and PP (polypropylene) are heated above the melting point and melted to form droplets. Said P
The E and PP droplets and other plastic (chlorine-containing plastic) pieces are transferred to the separation tank 7 by the pump 6, and the low specific gravity PE and PP droplets in the separation tank 7 have a high specific gravity due to a difference in specific gravity. Chlorine-containing plastic (PVC)
And PVDC). Further, the droplet is cooled in the cooling pipe 8 to a temperature lower than its melting point, and is formed into granules having a particle diameter of 6 mm or less. The granulated granules are separated from the specific gravity liquid by the vibrating sieve 9. The separated specific gravity liquid (urea aqueous solution) is returned to the specific gravity liquid water tank 10, heated again by the heater 11 in the water tank 10, washed by the pump 12, and returned to the mixing tank 4.

【0016】一方、高比重の塩素含有プラスチック(P
VCおよびPVDC)片は、分離槽7の下部から排出さ
れ、振動篩13で比重液(尿素水溶液)と分離される。
また、比重液は比重液水槽10に戻され同様に再使用さ
れる。
On the other hand, high specific gravity chlorine-containing plastics (P
VC and PVDC) pieces are discharged from the lower part of the separation tank 7 and separated from the specific gravity liquid (urea aqueous solution) by the vibrating sieve 13.
Further, the specific gravity liquid is returned to the specific gravity liquid water tank 10 and reused similarly.

【0017】本実施の形態では、フィルム系プラスチッ
クの処理について説明したが、ボトル系プラスチックや
産業廃棄物から分離した廃プラスチックにも本発明を適
用することができることはいうまでもない。
In the present embodiment, the treatment of film-based plastic has been described, but it goes without saying that the present invention can be applied to bottle-based plastic and waste plastic separated from industrial waste.

【0018】また、本実施の形態では、比重液の尿素水
溶液の尿素の含有量を尿素:水=10:1として尿素水
溶液の温度を190℃としたが、尿素の含有量を尿素:
水=7:1として比重液の温度(沸点)をPE融点以上
の約120℃(状況で対応)としPEのみを造粒して回
収することもできる。
Further, in the present embodiment, the urea content of the urea aqueous solution as a specific gravity solution is set to urea: water = 10: 1, and the temperature of the urea aqueous solution is set to 190 ° C.
It is also possible to granulate and collect only PE by setting the temperature (boiling point) of the specific gravity liquid to about 120 ° C. (corresponding in some circumstances) equal to or higher than the melting point of PE with water = 7: 1.

【0019】[0019]

【発明の効果】以上説明したように、この発明によれ
ば、比重液として尿素含有水溶液を使用することにより
所定の加圧装置を使用することなくPEおよびPPの融
点まで加熱可能として、廃プラスチックから塩素含有プ
ラスチックとPEおよびPPとを分離するとともにPE
およびPPを鉄源の還元剤としてマテリアルリサイクル
に適した粒径の粒状物に造粒し回収することができ、加
圧装置を使用しないため工程上および設備上有利であ
り、かくして、工業上有用な効果がもたらされる。
As described above, according to the present invention, waste plastics can be heated to the melting points of PE and PP by using an aqueous urea-containing solution as a specific gravity liquid without using a predetermined pressurizing device. PE and PP from chlorine-containing plastics and PE
And PP as an iron source reducing agent can be granulated and collected into granules having a particle size suitable for material recycling, which is advantageous in terms of process and equipment because no pressurizing device is used, and thus industrially useful Effects are provided.

【図面の簡単な説明】[Brief description of the drawings]

【図1】この発明の実施の形態に係る装置構成を示す工
程図である。
FIG. 1 is a process chart showing an apparatus configuration according to an embodiment of the present invention.

【符号の説明】[Explanation of symbols]

1 投入ホッパ 2 破砕機 3 ブロワ 4 洗浄、混合槽 5 攪拌機 6 ポンプ 7 分離槽 8 冷却管 9 振動篩 10 比重液水槽 11 ヒーター 12 ポンプ 13 振動篩 DESCRIPTION OF SYMBOLS 1 Input hopper 2 Crusher 3 Blower 4 Cleaning and mixing tank 5 Stirrer 6 Pump 7 Separation tank 8 Cooling pipe 9 Vibrating sieve 10 Specific gravity liquid water tank 11 Heater 12 Pump 13 Vibrating sieve

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 FI B29K 27:06 105:26 ──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 6 Identification code FI B29K 27:06 105: 26

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 比重分離装置の比重液として尿素を所定
量含有する水溶液を用い、前記比重分離装置に廃プラス
チックを投入し、前記比重液をポリエチレンおよびポリ
プロピレンの融点以上に加熱して前記廃プラスチックに
含まれるポリエチレンおよびポリプロピレンを溶融し比
重分離によって前記廃プラスチックからポリエチレンお
よびポリプロピレンを分離するとともに分離した溶融状
態の前記ポリエチレンおよびポリプロピレンを冷却して
所定の粒径を有する粒状物に成形することを特徴とする
廃プラスチックからポリエチレンおよびポリプロピレン
の粒状物を造粒する方法。
1. An aqueous solution containing a predetermined amount of urea is used as a specific gravity liquid of a specific gravity separation device, waste plastic is charged into the specific gravity separation device, and the specific gravity liquid is heated to a temperature equal to or higher than the melting point of polyethylene and polypropylene, thereby reducing the waste plastic. Melting polyethylene and polypropylene contained in the waste plastics, separating polyethylene and polypropylene from the waste plastic by specific gravity separation, and cooling the separated polyethylene and polypropylene in a molten state to form granules having a predetermined particle size. Of granulating polyethylene and polypropylene granules from waste plastics.
JP6839397A 1997-03-21 1997-03-21 Method for granulating granular matter of polyethylene and polypropylene from waste plastic Pending JPH10258425A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6839397A JPH10258425A (en) 1997-03-21 1997-03-21 Method for granulating granular matter of polyethylene and polypropylene from waste plastic

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6839397A JPH10258425A (en) 1997-03-21 1997-03-21 Method for granulating granular matter of polyethylene and polypropylene from waste plastic

Publications (1)

Publication Number Publication Date
JPH10258425A true JPH10258425A (en) 1998-09-29

Family

ID=13372426

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6839397A Pending JPH10258425A (en) 1997-03-21 1997-03-21 Method for granulating granular matter of polyethylene and polypropylene from waste plastic

Country Status (1)

Country Link
JP (1) JPH10258425A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006110531A (en) * 2004-10-13 2006-04-27 Aasu Recycle Kk Process for separating valuable materials from mixed plastics containing pvc(polyvinylidene chloride as well) and pet, and plastics/aluminum composite films
US20170005271A1 (en) * 2014-03-14 2017-01-05 Nissan Chemical Industries, Ltd. Aniline derivative and use thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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JP4637551B2 (en) * 2004-10-13 2011-02-23 アースリサイクル株式会社 Separation of useful substances from PVC (also vinylidene chloride), mixed plastics including PET, aluminum composite films, etc.
US20170005271A1 (en) * 2014-03-14 2017-01-05 Nissan Chemical Industries, Ltd. Aniline derivative and use thereof

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