JP2003200420A - Method for granulating saturated polyester resin and apparatus for granulating it - Google Patents
Method for granulating saturated polyester resin and apparatus for granulating itInfo
- Publication number
- JP2003200420A JP2003200420A JP2002002104A JP2002002104A JP2003200420A JP 2003200420 A JP2003200420 A JP 2003200420A JP 2002002104 A JP2002002104 A JP 2002002104A JP 2002002104 A JP2002002104 A JP 2002002104A JP 2003200420 A JP2003200420 A JP 2003200420A
- Authority
- JP
- Japan
- Prior art keywords
- polyester resin
- saturated polyester
- granulating
- pellets
- crystallization
- 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
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
-
- 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
- B29B7/00—Mixing; Kneading
- B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
- B29B7/58—Component parts, details or accessories; Auxiliary operations
- B29B7/582—Component parts, details or accessories; Auxiliary operations for discharging, e.g. doors
-
- 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
- B29B9/16—Auxiliary treatment of granules
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0022—Combinations of extrusion moulding with other shaping operations combined with cutting
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; 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
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/05—Filamentary, e.g. strands
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/76—Venting, drying means; Degassing means
- B29C48/761—Venting, drying means; Degassing means the vented material being in liquid form
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/76—Venting, drying means; Degassing means
- B29C48/768—Venting, drying means; Degassing means outside the apparatus, e.g. after the die
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/885—External treatment, e.g. by using air rings for cooling tubular films
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/919—Thermal treatment of the stream of extruded material, e.g. cooling using a bath, e.g. extruding into an open bath to coagulate or cool the 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
- B29B9/00—Making granules
- B29B9/16—Auxiliary treatment of granules
- B29B2009/165—Crystallizing granules
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92723—Content, e.g. percentage of humidity, volatiles, contaminants or degassing
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/345—Extrusion nozzles comprising two or more adjacently arranged ports, for simultaneously extruding multiple strands, e.g. for pelletising
-
- 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
- B29K2067/06—Unsaturated polyesters
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、飽和ポリエステル
樹脂をアンダーウォーターカッテング方式を採用して造
粒する方法において、アンダーウォーターカッテング造
粒装置に備えた保温・結晶化ゾーンで飽和ポリエステル
樹脂を造粒すると同時に造粒されたペレットを結晶化さ
せる方法およびその造粒装置に関する。TECHNICAL FIELD The present invention relates to a method of granulating a saturated polyester resin by using an underwater cutting method, and granulating the saturated polyester resin in a heat retaining / crystallization zone provided in an underwater cutting granulating apparatus. The present invention relates to a method for crystallizing pellets granulated at the same time and a granulating apparatus therefor.
【０００２】[0002]
【従来の技術】近年、包装分野において環境問題対応策
としてポリエステル樹脂の使用量が増大する傾向にあ
り、各種加工方法に対応した幅広い粘性特性が要求され
るようになってきた。例えば、ポリエステル樹脂が最も
多量に使用されている衣料用繊維、磁気テープ用ベース
フィルムを初めとするフィルムは、重合度の目安とされ
る極限粘度が０．５〜０．６の範囲が一般的である。一
方、延伸ボトル、トレー用の結晶化ポリエステル樹脂シ
ートに供されるポリエステル樹脂は０．７〜１．２の高
重合度のものが要求される。また、ポリエステル樹脂は
産業廃棄物の再生飽和ポリエステル樹脂を用いて再生品
を成形する際は、ポリエステル樹脂ペレットを結晶化処
理せずに射出成形、押出成形等に使用される場合がある
が、その場合は成形前に予めペレットを１６０℃、４時
間程度「絶乾」といわれるレベル（含水量が数１０ｐｐ
ｍレベル）まで加熱乾燥しないと溶融時に加水分解を起
こすという問題があるので、使用済み容器等のリサイク
ルに伴う再生ポリエステル樹脂の粘性や分子量を上昇さ
せることが行われている。2. Description of the Related Art In recent years, the amount of polyester resin used has tended to increase as a measure against environmental problems in the packaging field, and a wide range of viscous properties corresponding to various processing methods have been required. For example, films such as textile fibers for which polyester resin is used in the largest amount and base films for magnetic tapes generally have an intrinsic viscosity in the range of 0.5 to 0.6, which is a measure of the degree of polymerization. Is. On the other hand, the polyester resin used for the crystallized polyester resin sheet for stretched bottles and trays is required to have a high degree of polymerization of 0.7 to 1.2. When molding a recycled product using a recycled saturated polyester resin of industrial waste, the polyester resin may be used for injection molding, extrusion molding, etc. without crystallizing the polyester resin pellets. In some cases, the pellets should be dried at 160 ° C for 4 hours before being molded at a level called "absolute dryness" (the water content is several tens pp
Since there is a problem that hydrolysis occurs when melted unless heated and dried up to m level), the viscosity and the molecular weight of the recycled polyester resin are increased with the recycling of used containers and the like.
【０００３】以上のことから、飽和ポリエステル樹脂の
場合は、造粒装置でペレットを製造した後、別工程でそ
の飽和ポリエステル樹脂の粘性や分子量を上昇させる手
段の一例として固相重合が行われる。この固相重合は、
まず予備結晶化槽に導かれ、予備結晶化槽で、結晶化し
ていないいわゆる非晶質ポリエステル樹脂ペレットは、
その樹脂のガラス転移点（Ｔｇ）以上に加熱されると軟
化し始め、ペレットが「ベタツキ」を生じ、ペレット間
で融着が起こるのでペレットどうしの融着固結を防止す
る目的で攪拌しながら１７０℃内外に暖められた空気な
いし窒素等の不活性ガスで０．５時間程度処理すること
が通常行われている。このように前処理を施されたペレ
ットは、必要に応じて予熱槽を経由して固相重合槽に送
られ、固相重合は２００〜２３０℃の温度で真空にない
し不活性ガスを流しながら所望の重合度が得られるまで
加熱する。From the above, in the case of the saturated polyester resin, solid-state polymerization is carried out as an example of means for increasing the viscosity and the molecular weight of the saturated polyester resin in another step after the pellets are manufactured by the granulating apparatus. This solid phase polymerization is
First, the so-called amorphous polyester resin pellets that are not crystallized in the preliminary crystallization tank are introduced into the preliminary crystallization tank.
When heated above the glass transition point (Tg) of the resin, it begins to soften, the pellets become "sticky", and fusion occurs between the pellets. While stirring for the purpose of preventing fusion and solidification of the pellets. Treatment with air or an inert gas such as nitrogen that has been warmed up to 170 ° C. for about 0.5 hours is usually performed. The pellets thus pretreated are sent to a solid-state polymerization tank via a preheating tank as needed, and the solid-phase polymerization is performed at a temperature of 200 to 230 ° C. under a vacuum or while flowing an inert gas. Heat until the desired degree of polymerization is obtained.
【０００４】まず、飽和ポリエステル樹脂を造粒する際
に用いられる造粒装置としては、ストランド方式が慣用
されている。例えば、この装置は、図２に示すように、
押出機の押出シリンダの先端に取り付けられた押出ヘッ
ド に連設された押出ダイ１８ を有し、押出ダイ１８の
先端部に細孔２０が設けられ、溶融混練された樹脂が紐
状に押し出される。First, as a granulating apparatus used for granulating a saturated polyester resin, a strand system is commonly used. For example, this device is shown in FIG.
It has an extrusion die 18 connected to an extrusion head attached to the tip of an extrusion cylinder of an extruder, and a pore 20 is provided at the tip of the extrusion die 18, and melt-kneaded resin is extruded in a string shape. .
【０００５】押出ダイ１８の下には、細孔２０より押し
出された紐状の樹脂を受けて冷却する水室２３が設けら
れ、水室２３には通常２０℃程度の冷却水が冷却流体供
給管２４より供給された水室２３は、少なくとも８０℃
を超えないように冷却されている。さらに、水室２３で
急冷却された紐状の樹脂をカットし、ペレット状に加工
するカッター部２１が設けられてあり、ペレット状にな
った樹脂が排出口２２より非晶質ペレットが排出され
る。A water chamber 23 for receiving and cooling the string-shaped resin extruded from the pores 20 is provided under the extrusion die 18, and cooling water of about 20 ° C. is normally supplied to the water chamber 23. The water chamber 23 supplied from the pipe 24 is at least 80 ° C.
It is cooled not to exceed. Further, a cutter portion 21 for cutting the string-shaped resin rapidly cooled in the water chamber 23 and processing it into pellets is provided, and the pelletized resin is discharged from the discharge port 22 as amorphous pellets. It
【０００６】次いで、上記で得られた飽和ポリエステル
樹脂からなるペレットをポリエステル樹脂の粘性や分子
量を上昇させて所望の値にするために、例えば、固相重
合の別工程で処理することが行われる。その装置の一例
として図３に示すように、竪型固相重合装置が公知であ
る。本装置は、竪型円筒と下部が逆円錐形状の組み合わ
せからなる固相重合塔２６に、飽和ポリエステル樹脂ペ
レット投入口２７、および不活性ガス供給口３１、排気
口２８、固相重合終了ペレットの排出口３２が設けられ
ている。装置内部の攪拌部は水平方向の翼３０を複数本
有する攪拌軸２９で構成されている。固相重合に際して
は、まず不活性ガスを連続的に供給し、更に攪拌軸２９
を回転させこの状態で、ペレット投入口２７より飽和ポ
リエステル樹脂ペレットを定量投入する。投入終了後不
活性ガス供給口３１から供給される不活性ガスの温度
を、徐々に所定の温度まで上げていき、所定の温度に到
達後、飽和ポリエステル樹脂ペレットが所定の重合度に
到達するまで最終温度で加熱を続ける。所定の重合度に
到達後、直ちに供給する不活性ガスを冷却風に切り替
え、飽和ポリエステル樹脂ペレットを規定の温度まで冷
却する。固相重合後の飽和ポリエステル樹脂ペレットは
ペレット排出口３２より全量排出する。Next, in order to increase the viscosity and molecular weight of the polyester resin to a desired value, the pellets made of the saturated polyester resin obtained above are treated, for example, in a separate step of solid phase polymerization. . As an example of the apparatus, a vertical solid-state polymerization apparatus is known as shown in FIG. This apparatus includes a saturated polyester resin pellet inlet 27, an inert gas supply port 31, an exhaust port 28, and a solid-state polymerization completed pellet in a solid-state polymerization tower 26 composed of a combination of a vertical cylinder and a lower part having an inverted conical shape. A discharge port 32 is provided. The stirring unit inside the apparatus is composed of a stirring shaft 29 having a plurality of horizontal blades 30. In solid-state polymerization, first, an inert gas is continuously supplied, and the stirring shaft 29 is used.
In this state, the saturated polyester resin pellets are quantitatively charged through the pellet charging port 27. After the end of charging, the temperature of the inert gas supplied from the inert gas supply port 31 is gradually raised to a predetermined temperature, and after reaching the predetermined temperature, until the saturated polyester resin pellets reach a predetermined degree of polymerization. Continue heating at the final temperature. Immediately after reaching a predetermined degree of polymerization, the inert gas supplied is switched to cooling air to cool the saturated polyester resin pellets to a specified temperature. The saturated polyester resin pellets after the solid state polymerization are all discharged from the pellet discharge port 32.
【０００７】上記で説明したように、従来飽和ポリエス
テル樹脂の造粒加工と飽和ポリエステル樹脂の結晶化処
理もしくは高重合度化は各々別工程で行われており、そ
してその飽和ポリエステル樹脂の結晶化処理もしくは高
重合度化の手段として通常固相重合が行われていた。し
かしながら、固相重合においてはペレットの融着防止の
ために攪拌するためにペレット表面が荒れると共にペレ
ット間の摩擦によって生じる粉体が後工程に支障が生じ
るという問題があった。As described above, the granulation processing of the saturated polyester resin and the crystallization treatment or the high polymerization degree of the saturated polyester resin are conventionally performed in different steps, respectively, and the crystallization treatment of the saturated polyester resin is performed. Alternatively, solid-phase polymerization is usually performed as a means for increasing the degree of polymerization. However, in the solid-state polymerization, there is a problem that the surface of the pellets is roughened due to stirring for preventing fusion of the pellets, and powder generated by friction between the pellets interferes with the subsequent process.
【０００８】また、飽和ポリエステル樹脂のペレット加
工とそのペレットの結晶化処理を別々に２工程で行うこ
とから、エネルギー損失や処理効率に問題があった。Further, since the pellet processing of the saturated polyester resin and the crystallization treatment of the pellet are separately performed in two steps, there is a problem in energy loss and processing efficiency.
【０００９】[0009]
【発明が解決しようとする課題】本発明は、上記の問題
点を解決するためになされたもので、アンダーウォータ
ーカッテング方式により、その造粒装置に備えた保温・
結晶化ゾーン内で、飽和ポリエステル樹脂の造粒と同時
に造粒したペレットの結晶化処理を行ことが可能な、エ
ネルギー損失が少なく、処理効率に優れた飽和ポリエス
テル樹脂の造粒方法およびその造粒装置を提供すること
を課題とするものである。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and uses an underwater cutting method to retain heat and heat in a granulator.
Granulation method of saturated polyester resin capable of performing crystallization treatment of pellets granulated at the same time as granulation of saturated polyester resin in the crystallization zone, with low energy loss and excellent treatment efficiency, and granulation thereof It is an object to provide a device.
【００１０】[0010]
【課題を解決するための手段】上記課題を解決するため
に、請求項１に係る発明は、アンダーウォーターカッテ
ング方式の造粒装置を用いて飽和ポリエステル樹脂を造
粒する方法において、前記飽和ポリエステル樹脂を混練
押出する工程と、造粒装置に備えられた保温・結晶化ゾ
ーン内で熱媒体に押し出された溶融した前記飽和ポリエ
ステル樹脂を切断してペレットに加工する工程と、温度
制御が可能な該保温・結晶化ゾーンで前記飽和ポリエス
テル樹脂のガラス転移点（Ｔｇ）以上、融点（Ｔｍ）以
下の温度で保持して結晶化させる工程と、前記熱媒体を
除去乾燥する工程からなることを特徴とする飽和ポリエ
ステル樹脂の造粒方法である。In order to solve the above-mentioned problems, the invention according to claim 1 is a method for granulating a saturated polyester resin by using an underwater cutting granulating apparatus, wherein the saturated polyester resin is used. A step of kneading and extruding, a step of cutting the melted saturated polyester resin extruded into the heat medium into a pellet in a heat retention / crystallization zone provided in the granulating device, and a temperature controllable step. It is characterized by comprising a step of crystallizing the saturated polyester resin at a temperature of not less than the glass transition point (Tg) and not more than the melting point (Tm) of the saturated polyester resin in a heat retention / crystallization zone, and a step of removing and drying the heat medium. Is a method for granulating a saturated polyester resin.
【００１１】請求項２に係る発明は、請求項１記載の飽
和ポリエステル樹脂の造粒方法において、前記飽和ポリ
エステル樹脂が、ポリエチレンテレフタレート、ポリブ
チレンテレフタレート、ポリエチレンナフテレート、ポ
リエステルエーテル等の樹脂から選ばれるいずれかの樹
脂であることを特徴とする。The invention according to claim 2 is the method for granulating a saturated polyester resin according to claim 1, wherein the saturated polyester resin is selected from resins such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphtherate and polyester ether. It is characterized by being either resin.
【００１２】請求項３に係る発明は、アンダーウォータ
ーカッテング方式の造粒装置を用いて飽和ポリエステル
樹脂を造粒する装置において、前記飽和ポリエステル樹
脂を混練押出する手段と、押出ダイ先端部に設置された
ダイプレートに連設された保温・結晶化ゾーンを備え、
ダイプレートに連結された保温・結晶化ゾーン内に該ダ
イプレートの前面に隣接して設置されたカッターナイフ
の旋回面に開口する多数の細孔より保温・結晶化ゾーン
の熱媒体に押し出された溶融した前記飽和ポリエステル
樹脂がカッターナイフで切断されてペレットに加工する
手段と、温度制御が可能な該保温・結晶化ゾーンで前記
飽和ポリエステル樹脂のガラス転移点（Ｔｇ）以上、融
点（Ｔｍ）以下の温度で保持して結晶化させる手段と、
前記熱媒体を除去乾燥する手段を有することを特徴とす
る飽和ポリエステル樹脂の造粒装置である。According to a third aspect of the present invention, in an apparatus for granulating a saturated polyester resin by using an underwater cutting granulating apparatus, a means for kneading and extruding the saturated polyester resin and a tip of an extrusion die are installed. Equipped with a heat retention and crystallization zone connected to the die plate,
In the heat retention / crystallization zone connected to the die plate, extruded into the heat medium in the heat retention / crystallization zone from a large number of pores opened on the turning surface of the cutter knife installed adjacent to the front surface of the die plate. Means for cutting the melted saturated polyester resin into pellets by cutting with a cutter knife, and a glass transition point (Tg) or higher and a melting point (Tm) or lower of the saturated polyester resin in the temperature-controllable heat retention / crystallization zone. Means for holding and crystallizing at the temperature of
The saturated polyester resin granulating apparatus is provided with a means for removing and drying the heat medium.
【００１３】[0013]
【発明の実施の形態】本発明は、アンダーウォーターカ
ッテング方式の造粒装置を用いてその装置に備えた保温
・結晶化ゾーン内で、飽和ポリエステル樹脂を造粒と同
時に結晶化する方法に特徴を有するものであって、前記
飽和ポリエステル樹脂を混練押出する工程と、保温・結
晶化ゾーンの熱媒体中に押し出された溶融した前記飽和
ポリエステル樹脂を切断してペレットに加工する工程
と、同時に温度制御が可能な保温・結晶化ゾーンで前記
飽和ポリエステル樹脂のガラス転移点（Ｔｇ）以上、融
点（Ｔｍ）以下の温度で保持して結晶化させる工程と、
前記熱媒体を除去乾燥する工程からなる飽和ポリエステ
ル樹脂の造粒方法である。BEST MODE FOR CARRYING OUT THE INVENTION The present invention is characterized by a method of crystallizing a saturated polyester resin at the same time as granulation, using an underwater cutting granulation apparatus in a heat retention / crystallization zone provided in the apparatus. Having the step of kneading and extruding the saturated polyester resin, the step of cutting the melted saturated polyester resin extruded into the heat medium of the heat retention / crystallization zone to process into pellets, and temperature control at the same time And a crystallization zone in which the temperature of the glass transition point (Tg) of the saturated polyester resin is higher than the melting point (Tm) of the saturated polyester resin in the heat retention / crystallization zone where
It is a method for granulating a saturated polyester resin, which comprises a step of removing the heat medium and drying.
【００１４】本発明において造粒の対象となる飽和ポリ
エステル樹脂としては、ポリエチレンテレフタレート、
ポリブチレンテレフタレート、ポリエチレンナフテレー
ト、ポリエステルエーテル等を例示できる。The saturated polyester resin to be granulated in the present invention includes polyethylene terephthalate,
Examples thereof include polybutylene terephthalate, polyethylene naphtherate, polyester ether and the like.
【００１５】造粒装置としては、アンダーウォーターカ
ッティング方式のものであれば特に限定されるものでは
ないが、好ましくは連続混練部を有する１軸もしくは２
軸の造粒装置の採用が好ましい。The granulating device is not particularly limited as long as it is of an underwater cutting type, but preferably a uniaxial or biaxial having a continuous kneading section.
It is preferred to employ a shaft granulator.
【００１６】以下、本発明の実施態様を図面に基づいて
説明する。図１は、本発明の飽和ポリエステル樹脂の造
粒・結晶化処理する工程と装置要部を説明するために示
した説明図である。図１に基づいて、本発明の飽和ポリ
エステル樹脂の造粒方法とその装置について説明する。
本発明に係るアンダーウォーターカッティング方式造粒
装置には、原料フィード口１より所定の飽和ポリエステ
ル樹脂（フレークまたはパウダー）および各種添加剤を
連続的に供給する。混練部２では、供給した樹脂を溶融
しながらドライブ装置Ｍを備えたスクリュー３にて混練
する。押出機の押出シリンダの先端に取り付けられた押
出ヘッドに連設された押出ダイ４と、該ダイ４に連結用
ボルト（図示せず）を介して連設された造粒部Ａと結晶
化処理部Ｂとからなる保温・結晶化ゾーン９と、該保温
・結晶化ゾーン９に前記ボルトにより連設されたカッタ
ドライブ装置Ｍとを備え、前記ダイ４の先端部を構成す
るダイプレート５の前面には、カッタナイフ７が隣接し
ており、該カッタナイフ７は前記カッタドライブ装置Ｍ
から保温・結晶化ゾーン９を通って延設されたカッタ軸
８の先端部に取り付けられている。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view shown for explaining a step of granulating and crystallization of a saturated polyester resin of the present invention and an essential part of the apparatus. Based on FIG. 1, a method and apparatus for granulating a saturated polyester resin of the present invention will be described.
A predetermined saturated polyester resin (flakes or powder) and various additives are continuously supplied to the underwater cutting granulator according to the present invention from the raw material feed port 1. In the kneading section 2, the supplied resin is melted and kneaded by the screw 3 provided with the drive device M. Crystallization treatment with an extrusion die 4 connected to an extrusion head attached to the tip of an extrusion cylinder of an extruder, a granulation part A connected to the die 4 via a connecting bolt (not shown), and a crystallization process. Front surface of a die plate 5 that constitutes a tip portion of the die 4 and is provided with a heat retention / crystallization zone 9 including a part B and a cutter drive device M connected to the heat retention / crystallization zone 9 by the bolts. Is adjacent to a cutter knife 7, and the cutter knife 7 is connected to the cutter drive device M.
Is attached to the tip of a cutter shaft 8 extending through the heat insulation / crystallization zone 9.
【００１７】前記保温・結晶化ゾーン９は、造粒部Ａと
結晶化処理部Ｂとからなる。造粒部Ａは、通常、１００
℃程度の熱媒体が供給され充満されている。前記ダイプ
レート５には、カッタナイフ７の旋回面に開口する多数
の細孔６が開設されており、該細孔６より保温・結晶化
ゾーン９の造粒部Ａ内の循環している熱媒体中に押し出
された溶融樹脂は、押し出されると同時にカッタナイフ
７により切断されてペレットに加工される。この熱媒体
はタンク１３から流体ポンプ１４により保温・結晶化ゾ
ーン９の造粒部Ａへ送液される。The heat retaining / crystallization zone 9 comprises a granulation section A and a crystallization treatment section B. The granulation part A is usually 100
The heat medium of about ℃ is supplied and filled. The die plate 5 is provided with a large number of pores 6 that open to the swivel surface of the cutter knife 7, and the heat circulating in the granulation portion A of the heat retention / crystallization zone 9 is opened from the pores 6. The molten resin extruded into the medium is simultaneously extruded, cut by the cutter knife 7 and processed into pellets. This heat medium is sent from the tank 13 to the granulation part A of the heat retention / crystallization zone 9 by the fluid pump 14.
【００１８】このようにして得られた飽和ポリエステル
樹脂ペレットは、同一の保温・結晶化ゾーン９内の温度
制御が可能な結晶化処理部Ｂへ送られ、飽和ポリエステ
ル樹脂のガラス転移点（Ｔｇ）以上、融点（Ｔｍ）以下
の温度で保持して結晶化される。The saturated polyester resin pellets thus obtained are sent to the crystallization treatment section B capable of controlling the temperature in the same heat retention / crystallization zone 9 and the glass transition point (Tg) of the saturated polyester resin. As described above, crystallization is performed while maintaining the temperature below the melting point (Tm).
【００１９】結晶化処理を施された結晶化飽和ポリエス
テル樹脂ペレットは、ラインＤを通じてサイクロンから
なる脱水乾燥部Ｃに送られ、熱媒体より分離後取り出し
口１１よりペレットを取り出す。ここで、ペレットと分
離された熱媒体は濾過装置１２を通じてタンク７へ返送
される。The crystallized saturated polyester resin pellets, which have been subjected to the crystallization treatment, are sent to a dehydration / drying section C consisting of a cyclone through a line D, separated from the heat medium, and taken out from an outlet 11. Here, the heat medium separated from the pellets is returned to the tank 7 through the filtration device 12.
【００２０】図４は、造粒および固相重合における温度
プロファイルを示した概念図である。本発明に係る飽和
ポリエステル樹脂をアンダーウォーターカッテング方式
の造粒装置を用いて造粒する方法において、造粒装置に
備えた同一の保温・結晶化ゾーン内で飽和ポリエステル
樹脂の造粒と同時に結晶化を行うことで、図４に示すよ
うに、従来、造粒と結晶化を別々の工程で行っていた方
法に比較して、作業効率に優れると共にエネルギーの損
失を低減できる。また、本発明による飽和ポリエステル
樹脂の造粒方法によって得られる飽和ポリエステル樹脂
ペレットを使用すれば、固相重合における予備結晶化の
工程が不要であって、しかもペレットの融着防止のため
に攪拌することによるペレット表面が荒れると共にペレ
ット間の摩擦によって生じる粉体の発生が無く、成形等
の後工程に支障が生じるという問題が解消できる。FIG. 4 is a conceptual diagram showing a temperature profile in granulation and solid phase polymerization. In the method of granulating the saturated polyester resin according to the present invention using an underwater cutting granulator, the saturated polyester resin is crystallized simultaneously with the granulation of the saturated polyester resin in the same heat-retention / crystallization zone provided in the granulator. By performing the above, as shown in FIG. 4, as compared with the method in which the granulation and the crystallization are conventionally performed in separate steps, the work efficiency is excellent and the energy loss can be reduced. Further, when the saturated polyester resin pellets obtained by the method for granulating a saturated polyester resin according to the present invention are used, the step of pre-crystallization in solid-state polymerization is unnecessary, and stirring is performed to prevent fusion of the pellets. As a result, the surface of the pellets is roughened and the powder generated due to the friction between the pellets is not generated, so that the problem that the post-process such as molding is hindered can be solved.
【００２１】[0021]
【発明の効果】本発明により、飽和ポリエステル樹脂を
アンダーウォーターカッテング方式の造粒装置を用いて
造粒する方法において、造粒装置に備えた同一の保温・
結晶化ゾーン内で飽和ポリエステル樹脂の造粒と同時に
結晶化を行うことで、従来、造粒と結晶化を別々の工程
で行っていた方法に比較して、作業効率に優れると共に
エネルギーの損失を低減できる造粒方法およびその造粒
装置を提供できる。また、本発明による飽和ポリエステ
ル樹脂の造粒方法によって得られる飽和ポリエステルペ
レットを使用すれば、固相重合方法における予備結晶化
の工程が不要であって、しかもペレットの融着防止のた
めに攪拌することによるペレット表面が荒れると共にペ
レット間の摩擦によって生じる粉体の発生が無く、成形
等の後工程に支障が生じるという問題が解消できる。さ
らに、本発明による飽和ポリエステル樹脂の造粒方法
は、ペレットの直径が１ｍｍ以下のマイクロペレットの
造粒にも同等に併用できる。According to the present invention, in a method of granulating a saturated polyester resin using an underwater cutting granulator, the same heat retention
By performing crystallization at the same time as granulation of the saturated polyester resin in the crystallization zone, compared to the conventional method in which granulation and crystallization are performed in separate steps, work efficiency is excellent and energy loss is reduced. It is possible to provide a granulating method and a granulating apparatus that can reduce the number. Further, when the saturated polyester pellets obtained by the granulation method of the saturated polyester resin according to the present invention are used, the step of pre-crystallization in the solid-state polymerization method is unnecessary, and stirring is performed to prevent fusion of the pellets. As a result, the surface of the pellets is roughened and the powder generated due to the friction between the pellets is not generated, so that the problem that the post-process such as molding is hindered can be solved. Further, the method for granulating a saturated polyester resin according to the present invention can be equally used for granulating micropellets having a diameter of 1 mm or less.
【図１】本発明の一実施例としての飽和ポリエステル樹
脂の造粒・結晶化処理する工程と装置要部を説明するた
めに示した模式説明図である。FIG. 1 is a schematic explanatory view shown for explaining a step of granulating and crystallizing a saturated polyester resin and an essential part of the apparatus as one embodiment of the present invention.
【図２】従来のストランド方式の造粒装置の要部を示し
た模式説明図であるFIG. 2 is a schematic explanatory view showing a main part of a conventional strand-type granulating device.
【図３】一般的な固相重合装置の要部を示した模式説明
図である。FIG. 3 is a schematic explanatory view showing a main part of a general solid-state polymerization apparatus.
【図４】本発明の造粒方法と従来の一例として造粒と結
晶化処理の２工程からなる造粒方法とを概念的に比較説
明するために示した説明図である。FIG. 4 is an explanatory view conceptually showing a comparative explanation of a granulation method of the present invention and a conventional granulation method comprising two steps of granulation and crystallization.
１、１５、２７・・・原料供給口 ２、１６・・・混練部 ３、１７・・・スクリュー ４、１８・・・ダイ ５、１９・・・ダイプレート ６、２０・・・細孔 ７・・・カッターナイフ ８・・・カッター軸 ９・・・保温・結晶化ゾーン １０・・・サイクロン １１、２２、３２・・・ペレット排出口 １２・・・濾過装置 １３・・・タンク １４・・・流体ポンプ ２１・・・カッター ２３・・・水室 ２４・・・冷却流体供給管 ２５・・・冷却流体排出管 ２６・・・固相重合塔 ２８・・・排気口 ２９・・・攪拌軸 ３０・・・翼 ３１・・・不活性ガス供給口 Ａ・・・造粒部 Ｂ・・・保温・結晶化ゾーン Ｃ・・・熱媒体除去乾燥部 Ｄ、Ｅ・・・搬送工程 Ｍ・・・ドライブ装置 1, 15, 27 ... Raw material supply port 2, 16 ... Kneading section 3, 17 ... Screw 4, 18 ... Die 5, 19 ... Die plate 6, 20 ... Pore 7 ... Cutter knife 8: Cutter axis 9 ... Insulation / crystallization zone 10-Cyclone 11, 22, 32 ... Pellet outlet 12 ... Filtration device 13 ... Tank 14 ... Fluid pump 21 ... Cutter 23 ... water chamber 24 ... Cooling fluid supply pipe 25 ... Cooling fluid discharge pipe 26 ... Solid-state polymerization tower 28 ... Exhaust port 29 ... Stirrer shaft 30 ... wings 31 ... Inert gas supply port A ... Granulation part B: Insulation / crystallization zone C ... Heat medium removal drying section D, E ... Transport process M: Drive device
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 4F201 AA24 AA25 AA26 AR06 BA02 BC01 BC02 BC09 BC12 BC15 BL11 BN03 BN05 BN21 ─────────────────────────────────────────────────── ─── Continued front page F-term (reference) 4F201 AA24 AA25 AA26 AR06 BA02 BC01 BC02 BC09 BC12 BC15 BL11 BN03 BN05 BN21
Claims (3)
装置を用いて飽和ポリエステル樹脂を造粒する方法にお
いて、 前記飽和ポリエステル樹脂を混練押出する工程と、造粒
装置に備えられた保温・結晶化ゾーン内で熱媒体に押し
出された溶融した前記飽和ポリエステル樹脂を切断して
ペレットに加工する工程と、温度制御が可能な該保温・
結晶化ゾーンで前記飽和ポリエステル樹脂のガラス転移
点（Ｔｇ）以上、融点（Ｔｍ）以下の温度で保持して結
晶化させる工程と、前記熱媒体を除去乾燥する工程から
なることを特徴とする飽和ポリエステル樹脂の造粒方
法。1. A method for granulating a saturated polyester resin by using an underwater cutting granulator, comprising a step of kneading and extruding the saturated polyester resin, and a heat-retaining / crystallization zone provided in the granulator. The step of cutting the melted saturated polyester resin extruded into the heat medium by the above to process it into pellets,
Saturation, which comprises a step of holding the temperature of the glass transition point (Tg) or higher and a melting point (Tm) or lower of the saturated polyester resin in a crystallization zone for crystallization, and a step of removing and drying the heat medium. Granulation method of polyester resin.
ンテレフタレート、ポリブチレンテレフタレート、ポリ
エチレンナフテレート、ポリエステルエーテル等の樹脂
から選ばれるいずれかの樹脂であることを特徴とする請
求項１記載の飽和ポリエステル樹脂の造粒方法。2. The saturated polyester resin according to claim 1, wherein the saturated polyester resin is any resin selected from resins such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphtherate and polyester ether. Granulation method.
装置を用いて飽和ポリエステル樹脂を造粒する装置にお
いて、 前記飽和ポリエステル樹脂を混練押出する手段と、押出
ダイ先端部に設置されたダイプレートに連設された保温
・結晶化ゾーンを備え、ダイプレートに連結された保温
・結晶化ゾーン内に該ダイプレートの前面に隣接して設
置されたカッターナイフの旋回面に開口する多数の細孔
より保温・結晶化ゾーンの熱媒体に押し出された溶融し
た前記飽和ポリエステル樹脂がカッターナイフで切断さ
れてペレットに加工する手段と、温度制御が可能な該保
温・結晶化ゾーンで前記飽和ポリエステル樹脂のガラス
転移点（Ｔｇ）以上、融点（Ｔｍ）以下の温度で保持し
て結晶化させる手段と、前記熱媒体を除去乾燥する手段
を有することを特徴とする飽和ポリエステル樹脂の造粒
装置。3. An apparatus for granulating a saturated polyester resin by using an underwater cutting granulating apparatus, wherein a means for kneading and extruding the saturated polyester resin and a die plate installed at the tip of an extrusion die are connected. Insulating and crystallization zone that is connected to the die plate, and insulate from the numerous pores that open in the swivel surface of the cutter knife that is installed adjacent to the front surface of the die plate Means for cutting the melted saturated polyester resin extruded into the heat medium of the crystallization zone into a pellet by cutting with a cutter knife, and a glass transition point of the saturated polyester resin in the temperature controllable heat retention / crystallization zone A means for holding and crystallizing at a temperature of (Tg) or more and a melting point (Tm) or less and a means for removing and drying the heat medium are provided. And a saturated polyester resin granulating device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002002104A JP2003200420A (en) | 2002-01-09 | 2002-01-09 | Method for granulating saturated polyester resin and apparatus for granulating it |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002002104A JP2003200420A (en) | 2002-01-09 | 2002-01-09 | Method for granulating saturated polyester resin and apparatus for granulating it |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003200420A true JP2003200420A (en) | 2003-07-15 |
Family
ID=27642060
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002002104A Pending JP2003200420A (en) | 2002-01-09 | 2002-01-09 | Method for granulating saturated polyester resin and apparatus for granulating it |
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| Country | Link |
|---|---|
| JP (1) | JP2003200420A (en) |
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|---|---|---|---|---|
| WO2005035610A2 (en) * | 2003-09-18 | 2005-04-21 | Eastman Chemical Company | Thermal crystallization of polyester pellets in liquid |
| JP2005120372A (en) * | 2003-10-10 | 2005-05-12 | Eastman Chem Co | Heat crystallization of molten polyester polymer in fluid |
| DE102005008115A1 (en) * | 2005-02-21 | 2006-08-31 | Mann + Hummel Protec Gmbh | Process for crystallizing an amorphous plastic granulate |
| JP2007505968A (en) * | 2003-09-16 | 2007-03-15 | イーストマン ケミカル カンパニー | Direct coupling of melt polymerization and solid phase processing of PET |
| JP2008524037A (en) * | 2004-12-20 | 2008-07-10 | トータル・ペトロケミカルズ・リサーチ・フエリユイ | Pellet processing unit |
| JP2008542062A (en) * | 2005-05-26 | 2008-11-27 | ガラ・インダストリーズ・インコーポレイテッド | Method and apparatus for producing crystalline polymer pellets and granules |
| JP2010521334A (en) * | 2007-03-15 | 2010-06-24 | アオトマーティック プラスティックス マシナリー ゲーエムベーハー | Method for granulating and crystallizing thermo-flexible polymers |
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