JPH0225321B2 - - Google Patents
Info
- Publication number
- JPH0225321B2 JPH0225321B2 JP13665481A JP13665481A JPH0225321B2 JP H0225321 B2 JPH0225321 B2 JP H0225321B2 JP 13665481 A JP13665481 A JP 13665481A JP 13665481 A JP13665481 A JP 13665481A JP H0225321 B2 JPH0225321 B2 JP H0225321B2
- Authority
- JP
- Japan
- Prior art keywords
- surfactant
- circulating water
- circulating
- cooling water
- resin
- 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
Links
Classifications
-
- 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
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
- B29B9/065—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion under-water, e.g. underwater pelletizers
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Description
【発明の詳細な説明】
本発明は、樹脂ペレツト冷却水の循環方法に関
するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for circulating resin pellet cooling water.
従来、熱可塑性樹脂、殊に、ポリエチレンやポ
リプロピレンは、重合反応工程で得られた粉末状
のままでは成形加工に適さないために、これに各
種添加剤を加えて溶融混練した後、押出機により
細棒状に押出し、これを押出機出口に設けたカツ
ター箱内において、循環冷却水の存在下で冷却固
化すると同時に、切断してペレツト化している。
そして、この樹脂ペレツトは、循環冷却水と共に
カツター箱から排出され、循環冷却水から分離さ
れ、乾燥されて製品とされる。一方、樹脂ペレツ
トを分離した後の使用済循環冷却水は、再びカツ
ター箱に循環使用される。 Conventionally, thermoplastic resins, particularly polyethylene and polypropylene, are not suitable for molding in the powdered state obtained in the polymerization reaction process, so they are melt-kneaded with various additives and then processed using an extruder. The product is extruded into thin rods, cooled and solidified in the presence of circulating cooling water in a cutter box provided at the exit of the extruder, and simultaneously cut and pelletized.
The resin pellets are then discharged from the cutter box together with the circulating cooling water, separated from the circulating cooling water, and dried to form a product. On the other hand, the used circulating cooling water after separating the resin pellets is recycled to the cutter box again.
ところで、このような冷却水の循環において、
樹脂押出物をペレツトに切断する際に生じた切粉
は、循環冷却水に混入する。この切粉は、循環冷
却水の経略に設けたフイルターで捕捉除去するが
完全に除去することは困難で、微細な樹脂粉（通
常１〜500μ）はそのまま循環水と共に、装置系
を循環する。そして、この微細樹脂粉は、装置系
の内壁に付着して各種機器内を汚染するだけでな
く、時間の経過により、配管や、機器出口部、殊
に冷却器を閉塞し、操業停止などの不都合な問題
を生じる。 By the way, in this kind of cooling water circulation,
Chips generated when cutting the resin extrudate into pellets are mixed into the circulating cooling water. These chips are captured and removed by a filter installed in the circulating cooling water, but it is difficult to remove them completely, and the fine resin powder (usually 1 to 500 microns) continues to circulate through the equipment system along with the circulating water. This fine resin powder not only adheres to the inner walls of the equipment system and contaminates the inside of various devices, but over time, it can also clog piping, equipment outlets, and especially coolers, resulting in shutdowns and other problems. This creates an inconvenient problem.
本発明者は、樹脂ペレツト冷却水の循環に見ら
れるこのような問題を解決すべく鋭意研究を重ね
た結果、意外にも、循環冷却水に界面活性剤を循
環水中濃度が10〜100重量ppmとなるように注入
することにより、その目的を達成しうることを見
出し、本発明を完成するに到つた。 The inventor of the present invention has conducted extensive research in order to solve these problems in the circulation of resin pellet cooling water, and has unexpectedly found that the concentration of surfactant in the circulating water is 10 to 100 ppm by weight. The inventors have discovered that the purpose can be achieved by injecting so as to achieve the following, and have completed the present invention.
即ち、本発明によれば、樹脂押出機出口に設け
たカツター箱内に循環冷却水を導入し、該カツタ
ー箱内から、樹脂ペレツトを循環冷却水と共にカ
ツター箱から排出させ、循環冷却水から樹脂ペレ
ツトを分離した後、得られた使用済循環冷却水を
再びカツター箱に循環使用する方法において、該
循環冷却水に対し、界面活性剤を循環水中濃度が
10〜100重量ppmとなるように注入することを特
徴とする樹脂ペレツト冷却水の循環方法が提供さ
れる。本発明において用いる界面活性剤として
は、アニオン系、カチオン系、非イオン系などの
いずれであつてもよいが、特に非イオン系のもの
が好ましい。非イオン系のものとしては、高級ア
ルコールや、アルキルアミン、アルキルアミド、
又は脂肪酸などに対してエチレンオキシドを１個
又は２個以上付加反応させたもの、例えば、ポリ
オキシエチレンアルキルエーテル、ポリオキシエ
チレンアルキルフエニルエーテル、ポリオキシエ
チレンアルキルアミン、ポリオキシエチレンアル
キルエステル、ポリオキシエチレンアルキルアミ
ドなどが挙げられる。 That is, according to the present invention, circulating cooling water is introduced into a cutter box provided at the outlet of the resin extruder, resin pellets are discharged from the cutter box together with the circulating cooling water, and resin is removed from the circulating cooling water. After separating the pellets, the used circulating cooling water is recycled to the cutter box.
A method for circulating resin pellet cooling water is provided, which is characterized in that the resin pellet cooling water is injected at a concentration of 10 to 100 ppm by weight. The surfactant used in the present invention may be anionic, cationic, nonionic, etc., but nonionic surfactants are particularly preferred. Nonionic types include higher alcohols, alkyl amines, alkyl amides,
or those obtained by adding one or more ethylene oxides to fatty acids, such as polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene alkylamine, polyoxyethylene alkyl ester, polyoxy Examples include ethylene alkylamide.
本発明においては、界面活性剤は、循環水に対
して、循環水中濃度が10〜100重量ppmとなるよ
うに注入することが必要である。この注入量が10
重量ppm未満であると、循環水中に混入した樹脂
粉の機器内壁や配管内壁等に対する付着汚染を防
止する効果が充分でなく、また100重量ppmを超
えると、ペレツトに付着してペレツトの品質に悪
影響を与えたり、経済性を損うので好ましくな
い。また界面活性剤注入量は、一般的に、ペレツ
トに対する影響を考えて、ペレツトに対する付着
量が10重量ppm以下になるようにするのがよい。
循環水に対する界面活性剤の注入個所は任意であ
るが、好ましくは、循環水を一時貯蔵する循環水
タンクに連続的又は間けつ的に注入すれば、局部
的に高濃度になることがないので好ましい。 In the present invention, it is necessary to inject the surfactant into the circulating water so that the concentration in the circulating water is 10 to 100 ppm by weight. This injection amount is 10
If it is less than ppm by weight, the effect of preventing resin powder mixed in the circulating water from adhering to the inner walls of equipment or piping will not be sufficient, and if it exceeds 100 ppm by weight, it will adhere to the pellets and deteriorate the quality of the pellets. This is not desirable as it may have a negative impact or impair economic efficiency. In general, the amount of surfactant to be injected is preferably such that the amount of surfactant deposited on the pellets is 10 ppm by weight or less, considering the influence on the pellets.
The surfactant can be injected into the circulating water at any point, but it is preferable to inject the surfactant continuously or intermittently into a circulating water tank that temporarily stores the circulating water, so that the surfactant does not become locally concentrated. preferable.
次に、本発明を図面により説明する。図面は、
樹脂ペレツト冷却水を循環させる装置系統図を示
す。 Next, the present invention will be explained with reference to the drawings. The drawing is
A system diagram of a system for circulating resin pellet cooling water is shown.
図面において、熱可塑性樹脂混練物はライン１
から溶融押出機２に供給され、この押出機２か
ら、カツター箱３内に押出物が押出される。一
方、このカツター箱３には、冷却器４からの界面
活性剤を含む冷却用循環水がライン５を通つて導
入される。 In the drawing, the thermoplastic resin kneaded material is line 1.
The extrudate is supplied to a melt extruder 2 from which the extrudate is extruded into a cutter box 3. On the other hand, circulating cooling water containing a surfactant from a cooler 4 is introduced into the cutter box 3 through a line 5.
押出機２からの押出物は、カツター箱３内にお
いて、循環冷却水の存在下で冷却固化されると共
に、適当な寸法のペレツトに切断され、そして、
このペレツトは循環水と共にカツター箱３から排
出され、ライン６を通つて、ペレツトフイルター
７に送られる。このペレツトフイルター７によ
り、循環水中のペレツトは分離され、このペレツ
トは、ライン８を通り、ペレツト乾燥機９で乾燥
された後、ペレツト振動篩１０に送られ、ここで
ペレツトから、粉砕物が分離除去される。得られ
たペレツトは、ライン１１から製品として回収さ
れる。 The extrudate from the extruder 2 is cooled and solidified in the cutter box 3 in the presence of circulating cooling water, and is cut into pellets of appropriate size.
The pellets are discharged from the cutter box 3 together with circulating water and sent to a pellet filter 7 through a line 6. The pellets in the circulating water are separated by the pellet filter 7, and the pellets pass through a line 8, are dried in a pellet dryer 9, and then sent to a pellet vibrating sieve 10, where crushed materials are separated from the pellets. Separated and removed. The obtained pellets are recovered from line 11 as a product.
一方、ペレツトフイルター７を通過した循環水
は、ライン１２を通り、乾燥機９の排水ライン１
３からの循環水と共に、循環水貯蔵タンク１４に
送られる。 On the other hand, the circulating water that has passed through the pellet filter 7 passes through the line 12 and the drain line 1 of the dryer 9.
It is sent to the circulating water storage tank 14 together with the circulating water from 3.
循環水貯蔵タンク１４は、ライン１５から界面
活性剤が連続的又は間けつ的に注入される。循環
水はライン１６を経て循環ポンプ１７により貯蔵
タンクから抜出され、循環水フイルター１９を通
つて冷却器４に送られる。循環水フイルター１９
では、循環水中に混入する微細な樹脂粉（粒径
200〜400μ）が除去される。 A surfactant is continuously or intermittently injected into the circulating water storage tank 14 from a line 15. The circulating water is extracted from the storage tank via line 16 by circulating pump 17 and sent to cooler 4 through circulating water filter 19 . Circulating water filter 19
The fine resin powder (particle size) mixed into the circulating water is
200-400μ) are removed.
冷却器４には、循環水を冷却するための冷却水
がライン２１から供給され、循環水を間接冷却し
たのち、この冷却器４底部の排水ライン２２から
排出される。冷却器４で冷却された循環水は、カ
ツター箱３内に導入され、溶融樹脂押出物の冷却
固化に用いる。 Cooling water for cooling circulating water is supplied to the cooler 4 from a line 21, and after indirectly cooling the circulating water, it is discharged from a drainage line 22 at the bottom of the cooler 4. The circulating water cooled by the cooler 4 is introduced into the cutter box 3 and used for cooling and solidifying the molten resin extrudate.
本発明は、前記したように、装置系を循環する
樹脂ペレツト冷却用の循環水に、界面活性剤を循
環水中濃度が10〜100重量ppmとなるように、注
入したことから、循環水中に混入した樹脂粉の機
器内壁や、配管内壁、循環水の機器の出入口など
に対する付着汚染が防止され、従来の方法とは異
つて、長時間、操業を停止することなく、安定的
に装置の運転が可能となる上、高品質の樹脂ペレ
ツトが得られるという利点を有する。本発明の方
法を特に好ましく実施するには、図面に示すよう
に、循環水を循環水タンク頂部の供給ライン２３
より補充すると共に、循環水の一部を循環水タン
ク底部の排水ライン２４より連続的に抜出すこと
が好ましく、その排水割合は、循環水の１〜10重
量％になるのがよい。 As described above, in the present invention, a surfactant is injected into the circulating water for cooling resin pellets that circulates through the equipment system so that the concentration of the surfactant in the circulating water is 10 to 100 ppm by weight. This prevents resin powder from adhering to and contaminating the inside walls of equipment, piping walls, and entrances and exits of equipment for circulating water, and unlike conventional methods, the equipment can be operated stably for long periods of time without stopping operations. This method has the advantage that it is possible to obtain resin pellets of high quality. In order to carry out the method of the invention particularly preferably, the circulating water is supplied to the supply line 23 at the top of the circulating water tank, as shown in the drawing.
It is preferable to replenish the circulating water and continuously draw out a part of the circulating water from the drain line 24 at the bottom of the circulating water tank, and the proportion of the drained water is preferably 1 to 10% by weight of the circulating water.
次に、本発明を実施例によりさらに詳細に説明
する。 Next, the present invention will be explained in more detail with reference to Examples.
実施例 １
図面に示すような装置系において、循環水中
に、非イオン界面活性剤（炭素数12〜17のアルキ
ル基を持つビス−２−ヒドロキシエチルアルキル
アミド）を循環水中の濃度が50重量ppmとなるよ
うに連続注入した。また、この場合、循環水の一
部（２重量％）を連続的に排出すると共に、新し
い循環水をその排出分に応じて補充した。このよ
うにして操業を行つた結果、界面活性剤を添加し
ない場合には、７〜10日の連続運転で閉塞してい
た循環水冷却器４の閉塞が解消され、装置系の閉
塞トラブルは何ら生じなかつた。なお、この場合
のポリエチレン樹脂ペレツトに対する界面活性剤
の付着量は4.9重量ppmであり、界面活性剤がポ
リエチレンの品質に悪影響を及ぼすことはないこ
とが確認された。Example 1 In an apparatus system as shown in the drawing, a nonionic surfactant (bis-2-hydroxyethylalkylamide having an alkyl group having 12 to 17 carbon atoms) was added to the circulating water at a concentration of 50 ppm by weight. It was continuously injected so that Further, in this case, a portion (2% by weight) of the circulating water was continuously discharged, and new circulating water was replenished according to the discharged amount. As a result of operating in this way, when no surfactant is added, the clogging of the circulating water cooler 4, which had been clogged after 7 to 10 days of continuous operation, is resolved, and there are no blockage problems in the equipment system. It did not occur. Note that the amount of surfactant attached to the polyethylene resin pellets in this case was 4.9 ppm by weight, and it was confirmed that the surfactant had no adverse effect on the quality of polyethylene.
また、前記非イオン系界面活性剤に代えて、カ
チオン系界面活性剤やアニオン界面活性剤を同様
にして注入して操業を行つた場合にも閉塞の問題
は生じなかつた。 Further, the problem of clogging did not occur even when a cationic surfactant or anionic surfactant was similarly injected in place of the nonionic surfactant.
実施例 ２
実施例１における非イオン界面活性剤（炭素数
12〜17のアルキル基を持つビス−２−ヒドロキシ
エチルアルキルアミド）の循環水中の濃度を
11ppmとした以外は実施例１と同様な操作を行つ
たところ、実施例１と同じように装置系の閉塞ト
ラブルは何ら生じなかつた。なお、この場合のポ
リエチレン樹脂ペレツトに対する界面活性剤の付
着量は1.1重量ppmであり、界面活性剤がポリエ
チレンの品質に悪影響を及ぼすことはないことが
確認された。Example 2 Nonionic surfactant in Example 1 (carbon number
Calculate the concentration of bis-2-hydroxyethylalkylamide (having 12 to 17 alkyl groups) in circulating water.
The same operation as in Example 1 was performed except that the concentration was 11 ppm, and as in Example 1, no clogging trouble occurred in the apparatus system. In this case, the amount of surfactant adhered to the polyethylene resin pellets was 1.1 ppm by weight, and it was confirmed that the surfactant had no adverse effect on the quality of polyethylene.
また、前記非イオン系界面活性剤に代えて、カ
チオン系界面活性剤やアニオン界面活性剤を同様
にして注入して操業を行つた場合にも閉塞の問題
は生じなかつた。 Further, the problem of clogging did not occur even when a cationic surfactant or anionic surfactant was similarly injected in place of the nonionic surfactant.
実施例 ３
実施例１における非イオン界面活性剤（炭素数
12〜17のアルキル基を持つビス−２−ヒドロキシ
エチルアルキルアミド）の循環水中の濃度を
98ppmとした以外は実施例１と同様な操作を行つ
たところ、実施例１と同じように装置系の閉塞ト
ラブルは何ら生じなかつた。なお、この場合のポ
リエチレン樹脂ペレツトに対する界面活性剤の付
着量は8.0重量ppmであり、界面活性剤がポリエ
チレンの品質に悪影響を及ぼすことはないことが
確認された。Example 3 The nonionic surfactant in Example 1 (carbon number
Calculate the concentration of bis-2-hydroxyethylalkylamide (having 12 to 17 alkyl groups) in circulating water.
The same operation as in Example 1 was performed except that the concentration was 98 ppm, and as in Example 1, no clogging troubles occurred in the apparatus system. In this case, the amount of surfactant adhered to the polyethylene resin pellets was 8.0 ppm by weight, and it was confirmed that the surfactant had no adverse effect on the quality of polyethylene.
また、前記非イオン系界面活性剤に代えて、カ
チオン系界面活性剤やアニオン界面活性剤を同様
にして注入して操業を行つた場合にも閉塞の問題
は生じなかつた。 Further, the problem of clogging did not occur even when a cationic surfactant or anionic surfactant was similarly injected in place of the nonionic surfactant.
比較例 １
界面活性剤を添加しない以外は実施例１と同様
に操作したところ、７〜10日間の連続運転で循環
水冷却器４が閉塞する等の装置系のトラブルを生
じ、本発明のように長時間連続して操業すること
ができなかつた。Comparative Example 1 When the same operation as in Example 1 was carried out except that no surfactant was added, troubles with the equipment system such as clogging of the circulating water cooler 4 occurred during continuous operation for 7 to 10 days, and it was not possible to use the method of the present invention. It was not possible to operate continuously for a long time.
比較例 ２
実施例１における非イオン界面活性剤（炭素数
12〜17のアルキル基を持つビス−２−ヒドロキシ
エチルアルキルアミド）の循環水中の濃度を
8ppmとした以外は、実施例１と同様な操作を行
つたところ、20日間の連続運転で循環水冷却器４
が閉塞する等の装置系のトラブルが生じ、本発明
のように長期間連続して操業することができなか
つた。Comparative Example 2 Nonionic surfactant in Example 1 (carbon number
Calculate the concentration of bis-2-hydroxyethylalkylamide (having 12 to 17 alkyl groups) in circulating water.
When the same operation as in Example 1 was performed except that the setting was 8 ppm, circulating water cooler 4 was removed after 20 days of continuous operation.
Problems with the equipment system such as blockage occurred, making it impossible to operate continuously for a long period of time as in the present invention.
なお、この場合のポリエチレン樹脂ペレツトに
対する界面活性剤の付着量は0.8重量ppmであつ
た。 In this case, the amount of surfactant attached to the polyethylene resin pellets was 0.8 ppm by weight.
比較例 ３
実施例１における非イオン界面活性剤（炭素数
12〜17のアルキル基を持つビス−２−ヒドロキシ
エチルアルキルアミド）の循環水中の濃度を
110ppmとして以外は実施例１と同様な操作を行
つた。Comparative Example 3 Nonionic surfactant in Example 1 (carbon number
Calculate the concentration of bis-2-hydroxyethylalkylamide (having 12 to 17 alkyl groups) in circulating water.
The same operation as in Example 1 was performed except that the concentration was changed to 110 ppm.
この場合、装置系の閉塞トラブルは生じなかつ
たもののポリエチレン樹脂ペレツトに対する界面
活性剤の付着量が11.7重量ppmとなつて、ポリエ
チレンペレツトの黄色化が著しくその品質が劣化
した。 In this case, although no clogging trouble occurred in the apparatus system, the amount of surfactant adhering to the polyethylene resin pellets was 11.7 ppm by weight, and the polyethylene pellets were yellowed and their quality was significantly deteriorated.
図面は樹脂ペレツト冷却水を循環させる装置系
統図を示す。
２……押出機、３……カツター箱、４……冷却
器、７……ペレツトフイルター、９……ペレツト
乾燥機、１０……ペレツト振動篩、１４……循環
水貯蔵タンク、１９……循環水フイルター。
The drawing shows a system diagram of a system for circulating resin pellet cooling water. 2... Extruder, 3... Cutter box, 4... Cooler, 7... Pellet filter, 9... Pellet dryer, 10... Pellet vibrating sieve, 14... Circulating water storage tank, 19... Circulating water filter.
Claims (1)
冷却水を導入し、該カツター箱内から、樹脂ペレ
ツトを循環冷却水と共にカツター箱から排出さ
せ、循環冷却水から樹脂ペレツトを分離した後、
得られた使用済循環冷却水を再びカツター箱に循
環使用する方法において、該循環冷却水に対し、
界面活性剤を循環水中に濃度が10〜100重量ppm
となるように注入することを特徴とする樹脂ペレ
ツト冷却水循環方法。1. Introducing circulating cooling water into the cutter box provided at the outlet of the resin extruder, discharging the resin pellets from the cutter box together with the circulating cooling water, and separating the resin pellets from the circulating cooling water.
In the method of recycling the obtained used circulating cooling water to the cutter box again, for the circulating cooling water,
Concentration of surfactant in circulating water is 10-100 ppm by weight
A resin pellet cooling water circulation method characterized by injecting water so that
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13665481A JPS5838117A (en) | 1981-08-31 | 1981-08-31 | Method of circulating cooling water for resin pellet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13665481A JPS5838117A (en) | 1981-08-31 | 1981-08-31 | Method of circulating cooling water for resin pellet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5838117A JPS5838117A (en) | 1983-03-05 |
| JPH0225321B2 true JPH0225321B2 (en) | 1990-06-01 |
Family
ID=15180379
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13665481A Granted JPS5838117A (en) | 1981-08-31 | 1981-08-31 | Method of circulating cooling water for resin pellet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5838117A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5895617A (en) * | 1996-07-31 | 1999-04-20 | The Japan Steel Works, Ltd. | Method and apparatus for transporting underwater cut pellets |
| DE19755732C2 (en) * | 1997-12-15 | 2000-01-13 | Waeschle Gmbh | Process for the production of granules from polymeric materials |
| JP5186082B2 (en) * | 2005-04-26 | 2013-04-17 | 出光興産株式会社 | Granulation method and granulated product of soft polyolefin resin |
| JP2007204688A (en) * | 2006-02-03 | 2007-08-16 | Fujifilm Corp | Manufacturing method of pellet aggregate |
| KR20170030468A (en) | 2014-08-01 | 2017-03-17 | 카타야마 케미칼, 인코포레이티드 | Method for producing resin pellets |
| JP5942280B1 (en) * | 2015-06-26 | 2016-06-29 | 株式会社片山化学工業研究所 | Manufacturing method of resin pellets |
-
1981
- 1981-08-31 JP JP13665481A patent/JPS5838117A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5838117A (en) | 1983-03-05 |
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