JP4730881B2 - Rubber coated head - Google Patents

Rubber coated head Download PDF

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Publication number
JP4730881B2
JP4730881B2 JP2004299905A JP2004299905A JP4730881B2 JP 4730881 B2 JP4730881 B2 JP 4730881B2 JP 2004299905 A JP2004299905 A JP 2004299905A JP 2004299905 A JP2004299905 A JP 2004299905A JP 4730881 B2 JP4730881 B2 JP 4730881B2
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Prior art keywords
rubber
base
coated head
belt
head
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JP2006110830A (en
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修行 須田
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Bridgestone Corp
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Bridgestone Corp
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Priority to JP2004299905A priority Critical patent/JP4730881B2/en
Priority to PCT/JP2005/018804 priority patent/WO2006041101A1/en
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    • 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
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
    • B29C48/34—Cross-head annular extrusion nozzles, i.e. for simultaneously receiving moulding material and the preform to be coated
    • 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
    • B29C48/07—Flat, e.g. panels
    • 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
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. 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
    • B29C48/03—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
    • B29C48/13—Articles with a cross-section varying in the longitudinal direction, e.g. corrugated pipes
    • 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
    • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
    • B29C48/156—Coating two or more articles simultaneously
    • 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
    • B29C48/92—Measuring, controlling or regulating
    • 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
    • B29C2948/92514—Pressure
    • 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
    • B29C2948/9258—Velocity
    • 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
    • B29C2948/92609—Dimensions
    • B29C2948/92647—Thickness
    • 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
    • B29C2948/92809—Particular value claimed
    • 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
    • B29C2948/92819—Location or phase of control
    • B29C2948/92828—Raw material handling or dosing, e.g. active hopper or feeding device
    • 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
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92904—Die; Nozzle zone
    • 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
    • B29C48/06—Rod-shaped
    • 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
    • B29C48/305—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets
    • B29C48/31—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets being adjustable, i.e. having adjustable exit sections
    • B29C48/313—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets being adjustable, i.e. having adjustable exit sections by positioning the die lips
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/38—Textile inserts, e.g. cord or canvas layers, for tyres; Treatment of inserts prior to building the tyre
    • B29D2030/381—Textile inserts, e.g. cord or canvas layers, for tyres; Treatment of inserts prior to building the tyre the inserts incorporating reinforcing parallel cords; manufacture thereof
    • 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
    • B29K2021/00—Use of unspecified rubbers as moulding 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
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/08—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns
    • B29K2105/10—Cords, strands or rovings, e.g. oriented cords, strands or rovings
    • B29K2105/101—Oriented
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2030/00—Pneumatic or solid tyres or parts thereof
    • B29L2030/003—Plies; Breakers
    • B29L2030/005—Belts

Description

本発明は、引き揃えられた複数本のコードの両面に薄いゴム層を被覆して押し出すことにより、ベルトやカーカスプライ等の帯状体を製造するインシュレーション方式のゴム被覆ヘッドに関し、特に一つのヘッドにより異なる厚みの帯状体を製造可能なゴム被覆ヘッドに関する。   The present invention relates to an insulation-type rubber-coated head for manufacturing a belt-like body such as a belt or a carcass ply by covering and extruding a thin rubber layer on both surfaces of a plurality of aligned cords, and in particular, one head. The present invention relates to a rubber-coated head capable of producing strips having different thicknesses.

例えばタイヤのベルトは、引き揃えられた複数本のベルト層コードの両面に薄いゴム層を被覆してサンドイッチ状にすることで形成される。このような引き揃えられた複数本のコードに対してゴムを被覆する装置として、それらのコードを押出機のゴム被覆ヘッド内のコード通路を通過させているときに、コード通路の両側、例えば上下から合流するゴム流路にゴムを供給してコードの両面にゴムを被覆し、その後、ゴム被覆ヘッド前端に配置された口金の扁平な開口部の寸法によってコードの両面に被覆されたゴムの厚みを決定するように構成した、所謂インシュレーション方式の押出機がある（特許文献１参照）。   For example, a tire belt is formed by sandwiching a thin rubber layer on both sides of a plurality of belt layer cords that are aligned. As a device for coating rubber on such a plurality of aligned cords, when these cords are passed through the cord passage in the rubber coating head of the extruder, The thickness of the rubber covered on both sides of the cord by supplying rubber to the rubber flow path that joins from both sides of the cord and coating the rubber on both sides of the cord, and then by the dimensions of the flat opening of the base located at the front end of the rubber-coated head There is a so-called insulation type extruder configured so as to determine (see Patent Document 1).

図５はインシュレーション方式による従来の押出機の斜視図であり、図６はそのゴム被覆ヘッド４のＡ−Ａ断面図である。   FIG. 5 is a perspective view of a conventional extruder using an insulation system, and FIG. 6 is a cross-sectional view of the rubber-coated head 4 taken along line AA.

図５に示すように、インシュレーション方式による押出機は、上面に設けられたホッパ２から投入されたゴム材料を攪拌してゴムを生成するゴム生成部１と、ゴム生成部１の側面に連結され、かつスクリューを内蔵し、ゴム生成部１から送出されたゴムを混練・加熱しながら前方へ移送するシリンダ３と、シリンダ３の先端に連結され、かつ図示されていない移送手段により張力を付与されて移送される複数本のコードＣを所定の相対配列、例えば平行に保持して導入するとともに、その上下両面にシリンダ３から移送されてきたゴムを被覆して形成したベルトＢを外部へ送出するゴム被覆ヘッド４とを備えている。   As shown in FIG. 5, an extruder using an insulation system is connected to a rubber generating unit 1 that generates rubber by stirring a rubber material introduced from a hopper 2 provided on the upper surface, and a side surface of the rubber generating unit 1. In addition, a cylinder 3 that incorporates a screw and transports the rubber delivered from the rubber generating unit 1 forward while kneading and heating is connected to the tip of the cylinder 3 and a tension is applied by a transport means (not shown). A plurality of cords C to be transferred are introduced while being held in a predetermined relative arrangement, for example, in parallel, and a belt B formed by covering the upper and lower surfaces with the rubber transferred from the cylinder 3 is sent to the outside. And a rubber-coated head 4.

図６に示すように、ゴム被覆ヘッド４は、Ａ−Ａ断面が上下対称に構成されており、インサータ１１と、インサータ１１を保持するインサータホルダ１２とを備えている。ゴム被覆ヘッド４は、その上下方向の中心を前後に貫通するコード通路１３を備えており、後方から供給される複数本のコードＣを所定の相対配列に保持して通過させることができる。インサータホルダ１２の前方には、上下対称な口金（ダイ）２２がダイホルダ２１に保持され、インサータホルダ１２の前面に対して間隔を空けて配置されている。   As shown in FIG. 6, the rubber-coated head 4 has an AA cross section that is vertically symmetrical, and includes an inserter 11 and an inserter holder 12 that holds the inserter 11. The rubber-coated head 4 includes a cord passage 13 that penetrates the center in the vertical direction back and forth, and can pass a plurality of cords C supplied from the rear while maintaining a predetermined relative arrangement. In front of the inserter holder 12, a vertically symmetrical base (die) 22 is held by the die holder 21, and is arranged at a distance from the front surface of the inserter holder 12.

インサータホルダ１２の前面には、インサータホルダ１２の上下の端からそれぞれ前下方及び前上方にテーパ状の傾斜面１７，１８が延設されており、口金２２の上側部の後部上端から前下方に延設された傾斜面１９及び口金２２の下側部の後部下端から前上方に延設された傾斜面２０との間で、先端先細りの上下対称なゴム流路１５，１６を形成している。また、口金２２の上側部の傾斜面１９の下端の前方に延設された下向きの水平面と、口金２２の下側部の傾斜面２０の上端の前方に延設された上向きの水平面との間に高さｈの偏平な通路２３を形成している。   On the front surface of the inserter holder 12, tapered inclined surfaces 17 and 18 are extended from the upper and lower ends of the inserter holder 12 to the front lower side and the front upper side, respectively. Between the inclined surface 19 that is extended and the inclined surface 20 that extends forward and upward from the lower rear end of the lower portion of the base 22, the rubber channels 15 and 16 that are symmetrical in the up and down direction are formed. . Also, between the downward horizontal plane extending forward of the lower end of the inclined surface 19 on the upper side of the base 22 and the upward horizontal plane extending forward of the upper end of the inclined surface 20 of the lower side of the base 22 A flat passage 23 having a height h is formed.

以上のように構成された押出機において、ゴム生成部１からシリンダ３へ供給されたゴムは、シリンダ３のスクリューの作用下で混練・溶融されながらシリンダ３の先端へ移送され、ゴム被覆ヘッド４に供給されて、紙面の裏面側からゴム流路１５，１６に注入される。一方、図示されていないコード移送手段により張力を付与されて移送されている複数本のコードＣは、ゴム被覆ヘッド４の後端からインサータ１１に導入され、所定の相対配列に保持されて、その前端からゴム流路１５，１６の交差部に移送され、上下両面にゴムが被覆される。ゴムで被覆された複数本のコード（ベルト）Ｂは口金２２の上側部と下側部との間の通路２３を通過し、口金２２の先端の開口部から前方へ押し出される。   In the extruder configured as described above, the rubber supplied from the rubber generating unit 1 to the cylinder 3 is transferred to the tip of the cylinder 3 while being kneaded and melted under the action of the screw of the cylinder 3, and the rubber-coated head 4. And is injected into the rubber flow paths 15 and 16 from the back side of the paper surface. On the other hand, a plurality of cords C which are transferred with tension applied by a cord transfer means (not shown) are introduced into the inserter 11 from the rear end of the rubber-coated head 4 and are held in a predetermined relative arrangement. It is transferred from the front end to the intersection of the rubber flow paths 15 and 16, and the upper and lower surfaces are covered with rubber. A plurality of cords (belts) B covered with rubber pass through a passage 23 between the upper side and lower side of the base 22 and are pushed forward from the opening at the tip of the base 22.

ここで、口金２１の内部の通路２３及び先端の開口部の上下方向の寸法ｈが一定であるため、シリンダ３から送出するゴムの送出圧力を一定にした場合、コードＣの移送速度が高くなると、被覆されるゴムの厚みが薄くなるためベルトＢの厚みが薄くなり、コードＣの移送速度が低くなると、被覆されるゴムの厚みが厚くなるためベルトＢの厚みが厚くなるという問題がある。そこで、この問題を解決するために、特許文献には記載されていないが、コードＣの移送速度の切替に応じて、ゴム流路１５内に配置した圧力センサを用いて、ヘッド内のゴムの圧力を切り替えることが行われている。
特開２００２−１１３７９３号公報 Here, since the vertical dimension h of the passage 23 and the opening at the tip of the base 21 is constant, the transfer speed of the cord C increases when the pressure of the rubber delivered from the cylinder 3 is constant. Since the thickness of the rubber to be coated is reduced, the thickness of the belt B is reduced, and when the transfer speed of the cord C is reduced, the thickness of the rubber to be coated is increased and the thickness of the belt B is increased. Therefore, in order to solve this problem, although not described in the patent literature, the pressure sensor disposed in the rubber flow path 15 is used to switch the rubber in the head according to the switching of the transfer speed of the cord C. Switching the pressure is done.
JP 2002-113793 A

しかしながら、ゴムの送出圧力を高くするためにはスクリューの回転数を上昇させることが必要であり、その結果、送出されるゴムの温度も上昇する。そして、コードＣの移送速度が２０ｍ／min 程度迄であれば、口金から押し出されるベルトＢの表面のゴムの温度を１１０℃以内に保持できるが、それ以上の高速になると、ベルトＢの表面のゴムの温度が１２０℃以上に上昇し、ブルーム（ゴム表面への硫黄等の滲み出し）が発生するという問題があった。   However, in order to increase the delivery pressure of rubber, it is necessary to increase the rotational speed of the screw, and as a result, the temperature of the delivered rubber also increases. If the transfer speed of the cord C is up to about 20 m / min, the temperature of the rubber on the surface of the belt B extruded from the die can be kept within 110 ° C. However, if the speed is higher than that, the surface of the belt B There was a problem that the temperature of the rubber rose to 120 ° C. or more and bloom (exudation of sulfur or the like on the rubber surface) occurred.

本発明は、このような問題を解決するためになされたものであり、その目的は、引き揃えられて移送されている複数本のコードをゴムで被覆し、該ゴムで被覆されたコードの厚みを規定する偏平な開口を有する口金から帯状体にして押し出すゴム被覆ヘッドにおいて、コードの移送速度を高めたときに、ゴムの送出圧力を高めずに、帯状体の厚みが薄くならないように調整することである。 The present invention has been made in order to solve such a problem, and an object of the present invention is to coat a plurality of cords that are arranged and transported with rubber, and the thickness of the cord covered with the rubber. In a rubber-coated head that is extruded from a base having a flat opening that regulates the width of the belt , adjust it so that the thickness of the belt does not become thin without increasing the rubber feed pressure when the cord transfer speed is increased . That is.

請求項１に係る発明は、引き揃えられて移送されている複数本のコードをゴムで被覆し、該ゴムで被覆されたコードの厚みを規定する偏平な開口を有する口金から帯状体にして押し出すゴム被覆ヘッドであって、前記コードの移送速度に応じて前記開口の前記帯状体の厚み方向の寸法を変化させる手段を備え、該手段は、前記移送速度が高くなる程、前記寸法を大きくすることを特徴とするゴム被覆ヘッドである。
請求項２に係る発明は、請求項１記載のゴム被覆ヘッドにおいて、前記口金の前記開口の付近は前記帯状体の厚み方向の両側に分割されており、前記寸法を変化させる手段は、前記分割されている一方を前記帯状体の厚み方向に変位させるものであることを特徴とするゴム被覆ヘッドである。
請求項３に係る発明は、請求項２記載のゴム被覆ヘッドにおいて、前記寸法を変化させる手段は、前記分割されている一方を前記帯状体の厚み方向に弾性変形させるものであることを特徴とするゴム被覆ヘッドである。 According to the first aspect of the present invention, a plurality of cords that are aligned and transported are covered with rubber, and extruded from a base having a flat opening that defines the thickness of the cord covered with the rubber, as a strip. a rubber coating head, comprising a means for changing the dimension in the thickness direction of the strip of the opening in accordance with the transport speed of the code, said means, as the said transfer speed is high, rather the size of the dimension This is a rubber-coated head.
According to a second aspect of the present invention, in the rubber-coated head according to the first aspect, the vicinity of the opening of the base is divided on both sides in the thickness direction of the band-shaped body, and the means for changing the dimension is the division A rubber-coated head characterized in that one of the two is displaced in the thickness direction of the belt-like body.
According to a third aspect of the present invention, in the rubber-coated head according to the second aspect, the means for changing the dimensions elastically deforms one of the divided parts in the thickness direction of the belt-shaped body. This is a rubber-coated head.

本発明によれば、コードの移送速度を高めたとき、コードの移送速度が高くなる程、口金の開口の帯状体の厚み方向の寸法を大きくすることにより、ゴムの送出圧力を高めることなく、帯状体の厚みが薄くならないように調整できる。また、単一のゴム被覆ヘッドにより、異なる厚みの帯状体を製造することができる。さらに、ゴムのロットや練りが変わった場合のゲージ（ゴムの厚み）の微少差を口金で補正することができる。 According to the present invention, when increasing the transport speed of the code, as the transport speed of the code is increased by a dimension in the thickness direction of the band-like body of the die opening size Kusuru, without increasing the delivery pressure of the rubber The thickness of the strip can be adjusted so as not to be thin. Moreover, the strip | belt-shaped body of different thickness can be manufactured with a single rubber coating head. Furthermore, a slight difference in gauge (rubber thickness) when the rubber lot or kneading changes can be corrected with the die.

以下、本発明の実施形態について、面を参照して説明する。
［第１の実施形態］
図１は本発明の第１の実施形態に係る押出機の斜視図であり、図２はその押出機におけるゴム被覆ヘッドのＢ−Ｂ断面図及び口金の開口部の寸法を変化させる装置のブロック図である。図１において、図５と同一の部分には図５で使用した符号を付した。ここで、本実施形態に係る押出機は、ゴム被覆ヘッド５以外は従来装置と同じである。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
FIG. 1 is a perspective view of an extruder according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view of a rubber-coated head taken along the line B-B and a block of an apparatus for changing the size of an opening of a base in the extruder. FIG. In FIG. 1, the same parts as those in FIG. Here, the extruder according to this embodiment is the same as the conventional apparatus except for the rubber-coated head 5.

図２に示すように、ゴム被覆ヘッド５は、図１におけるＢ−Ｂ断面が上下対称に構成されており、インサータ１１と、インサータ１１を保持するインサータホルダ１２とを備えている。インサータ１１は、上下方向の中心を前後に貫通するコード通路１３を備えており、後方から供給される複数本のコードＣを所定の相対配列に保持して通過させることができる。インサータホルダ１２の前方には、金属等の弾性材料からなる口金（ダイ）３１がインサータホルダ１２の前面に対して間隔を空けて配置されている。   As shown in FIG. 2, the rubber-coated head 5 is configured so that the BB cross section in FIG. 1 is vertically symmetrical, and includes an inserter 11 and an inserter holder 12 that holds the inserter 11. The inserter 11 includes a cord passage 13 that penetrates the center in the vertical direction back and forth, and can pass a plurality of cords C supplied from the rear in a predetermined relative arrangement. A base (die) 31 made of an elastic material such as metal is disposed in front of the inserter holder 12 with a space from the front surface of the inserter holder 12.

口金３１は上側部３１ａと下側部３１ｂとに分割されており、内部奥の通路３３よりも開口側の通路の方が上下方向の寸法が長くなっている。また、下側部３１ｂの下面には油圧シリンダ３４のピストンロッドの上端に固定された押圧部材３５が配置されている。油圧シリンダ３４のピストンを上下動させるための油圧はシリンダ駆動装置３６から供給され、シリンダ駆動装置３６が油圧シリンダ３４に供給する油圧は制御装置３７により設定される。本実施形態では、コードＣの移送速度はＶ１ ，Ｖ２ ，Ｖ３ （Ｖ１ ＞Ｖ２ ＞Ｖ３ ）の３つの速度の何れかを任意に選択可能である。そして、制御装置３７は、コードＣの移送速度Ｖ１ ，Ｖ２ ，Ｖ３ の各々に対する油圧シリンダ３４の油圧設定値Ｐ１ ，Ｐ２ ，Ｐ３ （Ｐ１ ＜Ｐ２ ＜Ｐ３ ）の対応関係を記述した油圧設定テーブル３７ａを備えており、図示されていないコードＣの移送速度制御装置からコードＣの移送速度信号が入力されたときに、この油圧設定テーブル３７ａを参照して油圧を決定し、シリンダ駆動装置３６へ与える。 The base 31 is divided into an upper part 31a and a lower part 31b, and the dimension in the vertical direction of the passage on the opening side is longer than the passage 33 on the inner side. A pressing member 35 fixed to the upper end of the piston rod of the hydraulic cylinder 34 is disposed on the lower surface of the lower portion 31b. The hydraulic pressure for moving the piston of the hydraulic cylinder 34 up and down is supplied from the cylinder driving device 36, and the hydraulic pressure supplied to the hydraulic cylinder 34 by the cylinder driving device 36 is set by the control device 37. In the present embodiment, the transfer speed of the code C can be arbitrarily selected from three speeds V 1 , V 2 , and V 3 (V 1 > V 2 > V 3 ). Then, the control unit 37, the corresponding hydraulic setting value P 1 of the hydraulic cylinder 34 for each of the transport speed V 1, V 2, V 3 of the code C, P 2, P 3 ( P 1 <P 2 <P 3) An oil pressure setting table 37a describing the relationship is provided, and when a code C transfer speed signal is input from a code C transfer speed control device (not shown), the oil pressure is determined with reference to the oil pressure setting table 37a. To the cylinder driving device 36.

以上のように構成された押出機において、ゴム生成部１からシリンダ３へ供給されたゴムは、シリンダ３のスクリューの作用下で混練・溶融されながらシリンダ３の先端へ移送され、ゴム被覆ヘッド５に供給されて、紙面の裏面側からゴム流路１５，１６に注入される。一方、図示されていないコード移送手段により張力を付与されて移送されている複数本のコードＣは、ゴム被覆ヘッド５の後端からインサータ１１に導入され、所定の相対配列に保持されて、その前端からゴム流路１５，１６の交差部に移送され、上下両面にゴムが被覆される。ゴムで被覆された複数本のコード（ベルト）Ｂは口金３１の上側部３１ａと下側部３１ｂとの間の通路３３を通過し、口金３１の先端の開口部から前方へ押し出される。   In the extruder configured as described above, the rubber supplied from the rubber generating unit 1 to the cylinder 3 is transferred to the tip of the cylinder 3 while being kneaded and melted under the action of the screw of the cylinder 3, and the rubber-coated head 5. And is injected into the rubber flow paths 15 and 16 from the back side of the paper surface. On the other hand, a plurality of cords C which are transferred with tension applied by a cord transfer means (not shown) are introduced into the inserter 11 from the rear end of the rubber-coated head 5 and held in a predetermined relative arrangement. It is transferred from the front end to the intersection of the rubber flow paths 15 and 16, and the upper and lower surfaces are covered with rubber. A plurality of cords (belts) B covered with rubber pass through a passage 33 between the upper part 31 a and the lower part 31 b of the base 31 and are pushed forward from the opening at the tip of the base 31.

ここで、コードの移送速度がＶ１ のとき、制御装置３７はシリンダ駆動装置３６に対して、油圧をＰ１ に設定するための制御信号を送る。ここで、Ｐ１ ＝０とすると、油圧シリンダ３４のピストンロッドの上端に固定され押圧部材３５は口金３１の下側部材３１ｂの下面を上方へ押し上げないから、下側部材３１ａは図２に示すような水平方向に延びた状態、つまり弾性変形していない状態である。このとき、上側部材３１ａの下面と下側部材３１ｂの上面との間隔、つまり口金３１の内部奥の通路３３の上下方向の寸法はｈ１ である。 Here, when the code transfer speed is V 1 , the control device 37 sends a control signal for setting the hydraulic pressure to P 1 to the cylinder driving device 36. Here, if P 1 = 0, the lower member 31a is fixed to the upper end of the piston rod of the hydraulic cylinder 34 and the pressing member 35 does not push the lower surface of the lower member 31b of the base 31 upward, so that the lower member 31a is shown in FIG. This is a state extending in the horizontal direction, that is, a state where it is not elastically deformed. At this time, the vertical dimension of the interior back of the passage 33 of the gap between the lower surface and the upper surface of the lower member 31b of the upper member 31a, i.e. the die 31 is h 1.

また、コードの移送速度がＶ２ （Ｖ２ ＜Ｖ１ ）のとき、制御装置３５はシリンダ駆動装置３４に対して、油圧をＰ２ に設定するように制御信号を送る。Ｐ２ ＞０であるから、押圧部材３５は口金３１の下側部材３１ｂの下面を上方へ押し上げる。このため、図３に示すように、下側部材３１ｂが上方へ弾性変形して変位し、口金３１の奥の通路３３の上下方向の寸法はｈ２ に狭まり、口金３１の先端の開口の上下方向の寸法も同様に狭くなる。 When the code transfer speed is V 2 (V 2 <V 1 ), the control device 35 sends a control signal to the cylinder drive device 34 so as to set the hydraulic pressure to P 2 . Since P 2 > 0, the pressing member 35 pushes the lower surface of the lower member 31b of the base 31 upward. Therefore, as shown in FIG. 3, the lower member 31 b is elastically deformed and displaced upward, the vertical dimension of the passage 33 at the back of the base 31 is reduced to h 2, and the top and bottom of the opening at the tip of the base 31 are The direction dimension is similarly narrowed.

このように、本実施形態によれば、コードＣの移送速度が高い程、油圧シリンダ３４の油圧設定値を低くすることで、押圧部材３５による押し上げ量を少なくして、通路３３及び口金３１の開口部の上下方向の寸法を長くし、シリンダ３から送出するゴムの送出圧力を上げずにベルトＢの厚みを調整することができる。これにより、コードＣの移送速度を３０ｍ／min 程度に上げると共にベルトＢの厚みが薄くならないように調整しても、口金３１から送出されるベルトＢの表面のゴムの温度を１１０℃以内に保持できるので、ベルトＢの表面のゴムからブルームが発生する事態を防止できる。   As described above, according to the present embodiment, the higher the transfer speed of the code C, the lower the hydraulic pressure set value of the hydraulic cylinder 34, thereby reducing the push-up amount by the pressing member 35, and the passage 33 and the base 31. The thickness of the belt B can be adjusted without increasing the vertical dimension of the opening and increasing the delivery pressure of the rubber delivered from the cylinder 3. As a result, even if the transfer speed of the cord C is increased to about 30 m / min and the thickness of the belt B is not reduced, the temperature of the rubber on the surface of the belt B fed from the base 31 is kept within 110 ° C. Therefore, it is possible to prevent a bloom from being generated from the rubber on the surface of the belt B.

［第２の実施形態］
図４は本発明の第２の実施形態に係るゴム被覆ヘッドの図２に対応する構成を示す図である。この図において、図２と同一の構成要素には図２で使用した符号を付した。本実施形態に係るゴム被覆ヘッド６は、図２のゴム被覆ヘッド５における油圧シリンダ３４に代えて電動シリンダを用いたものである。 [Second Embodiment]
FIG. 4 is a view showing a configuration corresponding to FIG. 2 of the rubber-coated head according to the second embodiment of the present invention. In this figure, the same components as those in FIG. 2 are denoted by the reference numerals used in FIG. The rubber-coated head 6 according to the present embodiment uses an electric cylinder instead of the hydraulic cylinder 34 in the rubber-coated head 5 of FIG.

図４に示すように、口金３１の下側部３１ｂの下面には電動シリンダ４２のロッドの上端に固定された押圧部材４３が配置されている。電動シリンダ４２は、その内部にボールねじと、ボールねじと螺合するボールナットと、ボールナットに固定されたスライダとを備え、そのスライダに前記ロッドを固定すると共に前記ボールねじをサーボモータ４１の回転軸４１ａで回転可能に構成したものである。従って、サーボモータ４１の正逆回転により押圧部材４３の位置が図４の上下方向に変位し、かつその変位量は回転量に比例する。サーボモータ４１の回転はモータ駆動装置４４から供給される駆動信号により行われる。そして、駆動信号は制御装置４５の制御に基づいて生成される。本実施形態では、コードＣの移送速度はＶ１ ，Ｖ２ ，Ｖ３ （Ｖ１ ＞Ｖ２ ＞Ｖ３ ）の３つの速度の何れかを任意に選択可能である。そして、制御装置４５は、コードＣの移送速度Ｖ１ ，Ｖ２ ，Ｖ３ の各々に対するサーボモータ４１の回転量設定値Ｎ１ ，Ｎ２ ，Ｎ３ （Ｎ１ ＜Ｎ２ ＜Ｎ３ ）の対応関係を記述した回転量設定テーブル４５ａを備えており、図示されていないコードＣの移送速度制御装置からコードＣの移送速度信号が入力されたときに、この回転量設定テーブル４５ａを参照して回転量を決定し、モータ駆動装置４４へ与える。 As shown in FIG. 4, a pressing member 43 fixed to the upper end of the rod of the electric cylinder 42 is disposed on the lower surface of the lower portion 31 b of the base 31. The electric cylinder 42 includes a ball screw, a ball nut screwed to the ball screw, and a slider fixed to the ball nut. The electric cylinder 42 fixes the rod to the slider and attaches the ball screw to the servo motor 41. The rotary shaft 41a is configured to be rotatable. Therefore, the position of the pressing member 43 is displaced in the vertical direction of FIG. The servo motor 41 is rotated by a drive signal supplied from the motor drive device 44. The drive signal is generated based on the control of the control device 45. In the present embodiment, the transfer speed of the code C can be arbitrarily selected from three speeds V 1 , V 2 , and V 3 (V 1 > V 2 > V 3 ). The control device 45 then sets the rotation amount setting values N 1 , N 2 , and N 3 (N 1 <N 2 <N 3 ) of the servo motor 41 for each of the code C transfer speeds V 1 , V 2 , and V 3 . A rotation amount setting table 45a describing a correspondence relationship is provided. When a code C transfer speed signal is input from a code C transfer speed control device (not shown), the rotation amount setting table 45a is referred to. The rotation amount is determined and given to the motor drive device 44.

以上の構成を有する本実施形態に係るゴム被覆ヘッド６において、コードの移送速度がＶ１ のとき、制御装置４５はモータ駆動装置４４に対して、回転量をＮ１ に設定するための制御信号を送る。ここで、Ｎ１ ＝０とすると、電動シリンダ４２のロッドの上端に固定され押圧部材４３は口金３１の下側部材３１ｂの下面を上方へ押し上げないから、下側部材３１ａは図４に示すような水平方向に延びた状態、つまり弾性変形していない状態である。このとき、上側部材３１ａの下面と下側部材３１ｂの上面との間隔、つまり口金３１の内部の奥の通路３３の上下方向の寸法はｈ１ である。 In the rubber coating head 6 according to the present embodiment having the above configuration, when the transport speed of the code is V 1, the controller 45 a control signal for setting the motor driving device 44, the rotation amount N 1 Send. Here, if N 1 = 0, the lower member 31a is fixed to the upper end of the rod of the electric cylinder 42 and the pressing member 43 does not push up the lower surface of the lower member 31b of the base 31 so that the lower member 31a is as shown in FIG. It is the state extended in the horizontal direction, ie, the state which is not elastically deformed. At this time, the vertical dimension of the interior of the inner passage 33 of the gap between the lower surface and the upper surface of the lower member 31b of the upper member 31a, i.e. the die 31 is h 1.

また、コードの移送速度がＶ２ （Ｖ２ ＜Ｖ１ ）のとき、制御装置４５はモータ駆動装置４４に対して、回転量をＮ２ に設定するように制御信号を送る。Ｎ２ ＞０であるから、押圧部材４３は口金３１の下側部材３１ｂの下面を上方へ押し上げる。このため、図３と同様に下側部材３１ｂの開口部付近が上方へ弾性変形して変位し、口金３１の奥の通路３３の上下方向の寸法はｈ２ に狭まり、口金３１の先端の開口の上下方向の寸法も同様に狭くなる。 When the code transfer speed is V 2 (V 2 <V 1 ), the control device 45 sends a control signal to the motor drive device 44 so as to set the rotation amount to N 2 . Since N 2 > 0, the pressing member 43 pushes the lower surface of the lower member 31b of the base 31 upward. Therefore, displacement near the opening of the lower member 31b as in FIG 3 is elastically deformed upward, the vertical dimension of the inner passage 33 of the base 31 narrows to h 2, the tip of the mouthpiece 31 opening Similarly, the vertical dimension is also narrowed.

このように、本実施形態によれば、コードＣの移送速度が高い程、サーボモータ４１の回転量設定値を低くすることで、押圧部材４３による押し上げ量を少なくして口金３１の開口部の上下方向の寸法を長くし、シリンダ３から送出するゴムの送出圧力を上げずにベルトＢの厚みを調整できる。このため、コードＣの移送速度を３０ｍ／min 程度に上げると共にベルトＢの厚みが薄くならないように調整しても、口金３１から送出されるベルトＢの表面のゴムの温度を１１０℃以内に保持できるので、ベルトＢの表面のゴムからブルームが発生する事態を防止できる。   Thus, according to the present embodiment, the higher the code C transfer speed, the lower the rotation amount setting value of the servo motor 41, thereby reducing the amount of push-up by the pressing member 43 and reducing the opening of the base 31. The thickness of the belt B can be adjusted without increasing the vertical dimension and increasing the delivery pressure of the rubber delivered from the cylinder 3. For this reason, even if the transfer speed of the cord C is increased to about 30 m / min and the thickness of the belt B is not reduced, the temperature of the rubber on the surface of the belt B fed from the base 31 is kept within 110 ° C. Therefore, it is possible to prevent a bloom from being generated from the rubber on the surface of the belt B.

なお、以上の実施形態では、口金３１の下側部材３１ｂを押し上げて弾性変形させたが、上側部材３１ａを押し下げて弾性変形させてもよい。また、口金３１の上側部材３１ａ及び下側部材３１ｂのベルトＢの移送方向の長さを異ならせてもよい。   In the above embodiment, the lower member 31b of the base 31 is pushed up and elastically deformed. However, the upper member 31a may be pushed down and elastically deformed. Further, the lengths of the upper member 31a and the lower member 31b of the base 31 in the transfer direction of the belt B may be varied.

本発明の第１の実施形態に係る押出機の斜視図である。1 is a perspective view of an extruder according to a first embodiment of the present invention. 図１におけるゴム被覆ヘッドのＢ−Ｂ断面図及び口金の開口部の寸法を変化させる装置のブロック図である。It is a BB sectional view of a rubber covering head in Drawing 1, and a block diagram of a device which changes a size of an opening of a mouthpiece. 図１におけるゴム被覆ヘッドの口金の開口部を狭めた状態を示す断面図である。It is sectional drawing which shows the state which narrowed the opening part of the nozzle | cap | die of the rubber coating head in FIG. 本発明の第２の実施形態に係るゴム被覆ヘッドの図２に対応する構成を示す図である。It is a figure which shows the structure corresponding to FIG. 2 of the rubber coating head which concerns on the 2nd Embodiment of this invention. 従来の押出機の斜視図である。It is a perspective view of the conventional extruder. 図５におけるゴム被覆ヘッドのＡ−Ａ断面図である。It is AA sectional drawing of the rubber coating head in FIG.

符号の説明Explanation of symbols

５、６・・・ゴム被覆ヘッド、３１・・・口金、３１ａ・・・上側部材、３１ｂ・・・下側部材、３４・・・油圧シリンダ、４２・・・電動シリンダ。   5, 6 ... rubber-coated head, 31 ... base, 31a ... upper member, 31b ... lower member, 34 ... hydraulic cylinder, 42 ... electric cylinder.

Claims (3)

引き揃えられて移送されている複数本のコードをゴムで被覆し、該ゴムで被覆されたコードの厚みを規定する偏平な開口を有する口金から帯状体にして押し出すゴム被覆ヘッドであって、前記コードの移送速度に応じて前記開口の前記帯状体の厚み方向の寸法を変化させる手段を備え、該手段は、前記移送速度が高くなる程、前記寸法を大きくすることを特徴とするゴム被覆ヘッド。 A rubber-coated head that covers a plurality of cords that have been aligned and transported with rubber, and extrudes the cord from a base having a flat opening that defines the thickness of the cord coated with the rubber. comprising a means for changing the dimension in the thickness direction of the strip of the opening in accordance with the transport speed of the code, said means, as the said transfer rate is high, the rubber coating, wherein the size Kusuru the dimensions head. 請求項１記載のゴム被覆ヘッドにおいて、前記口金の前記開口の付近は前記帯状体の厚み方向の両側に分割されており、前記寸法を変化させる手段は、前記分割されている一方を前記帯状体の厚み方向に変位させるものであることを特徴とするゴム被覆ヘッド。 2. The rubber-coated head according to claim 1, wherein the vicinity of the opening of the base is divided on both sides in the thickness direction of the band-shaped body, and the means for changing the dimension is configured such that one of the divided portions is the band-shaped body. A rubber-coated head characterized by being displaced in the thickness direction. 請求項２記載のゴム被覆ヘッドにおいて、前記寸法を変化させる手段は、前記分割されている一方を前記帯状体の厚み方向に弾性変形させるものであることを特徴とするゴム被覆ヘッド。 3. The rubber-coated head according to claim 2, wherein the means for changing the dimensions elastically deforms one of the divided parts in the thickness direction of the belt-like body.
JP2004299905A 2004-10-14 2004-10-14 Rubber coated head Expired - Fee Related JP4730881B2 (en)

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