WO2012153829A1 - Method for producing thermoplastic resin foam body - Google Patents

Method for producing thermoplastic resin foam body Download PDF

Info

Publication number
WO2012153829A1
WO2012153829A1 PCT/JP2012/062099 JP2012062099W WO2012153829A1 WO 2012153829 A1 WO2012153829 A1 WO 2012153829A1 JP 2012062099 W JP2012062099 W JP 2012062099W WO 2012153829 A1 WO2012153829 A1 WO 2012153829A1
Authority
WO
WIPO (PCT)
Prior art keywords
mold
thermoplastic resin
inlet opening
outlet opening
width
Prior art date
Application number
PCT/JP2012/062099
Other languages
French (fr)
Japanese (ja)
Inventor
達也 山越
正廣 古澤
Original Assignee
旭ファイバーグラス株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 旭ファイバーグラス株式会社 filed Critical 旭ファイバーグラス株式会社
Priority to JP2013514064A priority Critical patent/JP5981422B2/en
Publication of WO2012153829A1 publication Critical patent/WO2012153829A1/en

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/36—Feeding the material to be shaped
    • B29C44/46—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length
    • B29C44/50—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length using pressure difference, e.g. by extrusion or by spraying
    • B29C44/505—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length using pressure difference, e.g. by extrusion or by spraying extruding the compound through a flat 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
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0012—Combinations of extrusion moulding with other shaping operations combined with shaping by internal pressure generated in the material, e.g. foaming
    • 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
    • B29C48/07—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
    • B29C48/25—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
    • 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
    • B29C2948/92704—Temperature
    • 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
    • B29C48/355—Conveyors for extruded articles
    • 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
    • B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
    • B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
    • B29C48/802—Heating
    • 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
    • B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
    • B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
    • B29C48/83—Heating or cooling the cylinders
    • B29C48/832—Heating
    • 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
    • B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
    • B29C48/906—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article using roller calibration

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

Provided is a production method with which when a thermoplastic resin is extruded from a single long, thin outlet opening disposed in a mold in order to extrusion- mold a tabular thermoplastic resin foam body, a smooth foam body can be obtained with little undulation in the direction of width of the foam body. The method for producing a thermoplastic resin foam body is characterized in that when horizontal width of the outlet opening in the mold is L1, horizontal width of the cross section of the resin flow path at the inlet opening is L2, and the distance between the inlet opening and the outlet opening is D, L1/L2 is 1.3 or greater and 3 < L1/D < 20 and the longitudinal width in the center in the direction of horizontal width of the cross section of the resin flow path at the inlet opening is narrower than the longitudinal width at either end in the direction of horizontal width.

Description

熱可塑性樹脂発泡体の製造方法Method for producing thermoplastic resin foam
　本発明は、熱可塑性樹脂発泡体の製造方法に関し、より詳しくは、発泡における異方性が少なく、特に発泡倍率１０以上においても、均質な寸法形状を有する板状の発泡体を製造するための方法に関する。 The present invention relates to a method for producing a thermoplastic resin foam. More specifically, the present invention relates to a method for producing a plate-like foam having a uniform dimensional shape even when foaming has a small anisotropy, particularly at an expansion ratio of 10 or more. Regarding the method.
　樹脂発泡体は、軽量で防音性および断熱性能に優れることから、自動車の内装や建材などに広く使用されている。緩衝性に優れ、かつ、施工性にも優れた熱可塑性樹脂発泡体を得るための方法としては、溶融状態の熱可塑性樹脂を押出用の金型に設けられた複数の通過孔を経由して吐出口から押出発泡させて樹脂発泡体を得る方法が知られている（引用文献１、２）。 Resin foams are widely used in automobile interiors and building materials because they are lightweight and have excellent soundproofing and heat insulation performance. As a method for obtaining a thermoplastic resin foam excellent in buffering property and workability, a molten thermoplastic resin is passed through a plurality of passage holes provided in a mold for extrusion. A method of obtaining a resin foam by extrusion foaming from a discharge port is known (cited documents 1 and 2).
　しかし、上記の方法により得られる樹脂発泡体は、各通過孔を経由して形成された樹脂発泡体の単位（ストランド）の集合体であり、ストランドの伸びる方向と直交する方向に折れやすいという特性（異方性）がある。このため、樹脂発泡体の異方性を減らす目的で、樹脂発泡体を製造するにあたり、細長い隙間が設けられた金型から熱可塑性樹脂を押出して方向性が少ない板状の発泡体を製造することが試みられている（特許文献３、４）。 However, the resin foam obtained by the above method is an aggregate of resin foam units (strands) formed through each passing hole, and is easily broken in a direction perpendicular to the direction in which the strands extend. (Anisotropic). For this reason, in order to reduce the anisotropy of the resin foam, when producing the resin foam, a thermoplastic resin is extruded from a mold provided with an elongated gap to produce a plate-like foam with less directionality. (Patent Documents 3 and 4).
特表平１－５０２２５２号公報JP-T-1-502252 特開２００６－１０２９５９号公報JP 2006-102959 A 特許第３６４０５３１号公報Japanese Patent No. 3640531 特許第４２３５７６８号公報Japanese Patent No. 4235768
　従来技術（特許文献３、４）で見られるように、細長い隙間が設けられた金型を使用する熱可塑性樹脂発泡体の製造方法においては、樹脂の発泡倍率が１０未満であれば均質な寸法形状を有する熱可塑性樹脂発泡体を得ることは容易である。しかし、発泡倍率を１０以上とすると、発泡セルの集合体の形状が部位によってばらつきやすく、そのため、熱可塑性樹脂発泡体の寸法形状がばらつき、あるいは表面平滑性が損なわれ、厚み方向にうねりが発生して、平滑な板状の熱可塑性樹脂発泡体が得られないという問題がある。発泡体の表面平滑性が損なわれると、表面ラミネート加工等の他材料との接触や接着の際に不陸が生じるという問題があり、特に、該熱可塑性樹脂発泡体を断熱材として使用する際には、この不陸は断熱欠損になり、所望する目的を果たすことができない。 As can be seen in the prior art (Patent Documents 3 and 4), in a method for producing a thermoplastic resin foam using a mold provided with an elongated gap, a uniform dimension is obtained if the foaming ratio of the resin is less than 10. It is easy to obtain a thermoplastic resin foam having a shape. However, if the expansion ratio is 10 or more, the shape of the foam cell aggregate tends to vary depending on the part, and therefore, the dimensional shape of the thermoplastic resin foam varies, or the surface smoothness is impaired, and waviness occurs in the thickness direction. Thus, there is a problem that a smooth plate-like thermoplastic resin foam cannot be obtained. If the surface smoothness of the foam is impaired, there is a problem that unevenness occurs in contact with or adhesion to other materials such as surface laminating, and particularly when the thermoplastic resin foam is used as a heat insulating material. In the meantime, this unevenness becomes an adiabatic defect and cannot fulfill the desired purpose.
　従って、本発明の目的は、出口開口部に細長い隙間が設けられた金型から熱可塑性樹脂を押出して板状の熱可塑性樹脂発泡体を製造する方法において、均質な寸法形状を有する発泡体、特に発泡倍率１０以上においても、均質な寸法形状を有する熱可塑性樹脂発泡体を製造できる方法を提供することにある。 Therefore, an object of the present invention is to produce a plate-like thermoplastic resin foam by extruding a thermoplastic resin from a mold having an elongated opening at an outlet opening, and a foam having a uniform size and shape, In particular, an object of the present invention is to provide a method capable of producing a thermoplastic resin foam having a uniform size and shape even at an expansion ratio of 10 or more.
　本発明者らは、板状の熱可塑性樹脂発泡体の製造技術に関し鋭意研究を重ねた結果、溶融状態の熱可塑性樹脂発泡体を、樹脂流路の断面の横幅（出口開口部の長手方向の幅）が徐々に広がるように金型を通過させ、さらに該金型の入口開口部と出口開口部との距離Ｄ、出口開口部の横幅Ｌ１および入口開口部における樹脂流路断面の横幅Ｌ２を特定の条件を満たすように規定することにより、幅方向のうねり（コルゲート）を軽減できること、特に、発泡倍率１０以上の熱可塑性樹脂発泡体においても同様の効果を発現することを見出し、本発明を完成するに至った。 As a result of intensive research on the manufacturing technology of the plate-like thermoplastic resin foam, the present inventors have determined that the molten thermoplastic resin foam has a lateral width of the cross section of the resin flow path (in the longitudinal direction of the outlet opening). The width D) is gradually increased so that the distance D between the inlet opening and the outlet opening of the mold, the lateral width L1 of the outlet opening, and the lateral width L2 of the cross section of the resin flow path at the inlet opening are set. It is found that by stipulating so as to satisfy a specific condition, waviness (corrugation) in the width direction can be reduced, and in particular, a similar effect is exhibited even in a thermoplastic resin foam having an expansion ratio of 10 or more. It came to be completed.
　具体的には、上記の目的は、下記の本発明の第１態様～第３態様によって達成される。すなわち、本発明の第１態様においては、金型に設けられた入口開口部から発泡剤を含む熱可塑性樹脂組成物を溶融状態で流して導入し、該組成物を上記金型に設けられた細長い出口開口部から吐出させて板状の発泡体を形成する熱可塑性樹脂発泡体の製造方法において、上記金型の出口開口部の横幅をＬ１、上記入口開口部における樹脂流路の断面の、上記出口開口部横幅方向の長さをＬ２、上記入口開口部と出口開口部との距離をＤとするとき、Ｌ１／Ｌ２を１．３以上とし、かつ、３＜Ｌ１／Ｄ＜２０とすることを特徴とする。 Specifically, the above object is achieved by the following first to third aspects of the present invention. That is, in the first aspect of the present invention, a thermoplastic resin composition containing a foaming agent is introduced in a molten state through an inlet opening provided in the mold, and the composition is provided in the mold. In the method of manufacturing a thermoplastic resin foam that is discharged from an elongated outlet opening to form a plate-like foam, the width of the outlet opening of the mold is L1, and the cross section of the resin flow path in the inlet opening is When the length in the horizontal direction of the outlet opening is L2, and the distance between the inlet opening and the outlet opening is D, L1 / L2 is 1.3 or more, and 3 <L1 / D <20. It is characterized by that.
　また、上記の目的は、本発明の第２態様、すなわち、金型に設けられた入口開口部から発泡剤を含む熱可塑性樹脂組成物を溶融状態で流して導入し、該組成物を上記金型に設けられた細長い出口開口部から吐出させて板状の発泡体を形成する熱可塑性樹脂発泡体の製造方法において、複数の樹脂流路から上記溶融状態の樹脂組成物を上記入口開口部に導入し、上記金型の出口開口部の横幅をＬ１、上記入口開口部における樹脂流路の断面の、上記出口開口部横幅方向の長さの合計をＬ２’、上記入口開口部と出口開口部との距離をＤとするとき、Ｌ１／Ｌ２’を１．３以上とし、かつ、３＜Ｌ１／Ｄ＜２０とすることを特徴とする熱可塑性樹脂発泡体の製造方法によっても達成される。 The above object is also achieved by introducing the thermoplastic resin composition containing a foaming agent in a molten state from the inlet opening provided in the mold, in the second aspect of the present invention, and introducing the composition into the mold. In a method for producing a thermoplastic resin foam, which is discharged from an elongated outlet opening provided in a mold to form a plate-like foam, the molten resin composition is introduced into the inlet opening from a plurality of resin flow paths. The width of the outlet opening of the mold is L1, the total length of the cross section of the resin flow path in the inlet opening in the width direction of the outlet opening is L2 ′, the inlet opening and the outlet opening When the distance between and is D, L1 / L2 ′ is set to 1.3 or more, and 3 <L1 / D <20, which is also achieved by the method for producing a thermoplastic resin foam.
　さらに上記の目的は、本発明の第３態様、すなわち、金型に設けられた入口開口部から発泡剤を含む熱可塑性樹脂組成物を溶融状態で流して導入し、該組成物を上記金型に設けられた細長い出口開口部から吐出させて板状の発泡体を形成する熱可塑性樹脂発泡体の製造方法において、上記金型の出口開口部の横幅をＬ１、上記入口開口部における樹脂流路の断面の、上記出口開口部横幅方向の長さ（横幅）をＬ２、上記入口開口部と出口開口部との距離をＤとするとき、Ｌ１／Ｌ２を１．３以上、３＜Ｌ１／Ｄ＜２０とし、かつ上記入口開口部における樹脂流路の断面の横幅方向の、中央部における縦幅Ｈ３を両端部における縦幅Ｈ２より狭くすることを特徴とする熱可塑性樹脂発泡体の製造方法によっても達成される。 Further, the above object is to introduce the thermoplastic resin composition containing a foaming agent in a molten state from the inlet opening provided in the mold, that is, the third aspect of the present invention, and introduce the composition into the mold. In the method of manufacturing a thermoplastic resin foam that is discharged from a long and narrow outlet opening provided in a plate to form a plate-like foam, the lateral width of the outlet opening of the mold is L1, and the resin flow path in the inlet opening When the length (width) of the cross section of the outlet opening in the lateral width direction is L2, and the distance between the inlet opening and the outlet opening is D, L1 / L2 is 1.3 or more, 3 <L1 / D <20, and the longitudinal width H3 at the center in the widthwise direction of the cross section of the resin flow path at the inlet opening is made narrower than the longitudinal width H2 at both ends. Is also achieved.
　本発明によれば、厚み方向のうねりが少なく、均質な寸法形状を有し、特に、発泡倍率１０以上においても、均質な寸法形状を有し、表面平滑性の高い板状の熱可塑性樹脂発泡体を得ることができる熱可塑性樹脂発泡体の製造方法が提供される。 According to the present invention, the plate-like thermoplastic resin foam has less waviness in the thickness direction and has a uniform dimensional shape, and particularly has a uniform dimensional shape and high surface smoothness even at an expansion ratio of 10 or more. A method for producing a thermoplastic resin foam capable of obtaining a body is provided.
本発明の第１態様の一例を示す模式図The schematic diagram which shows an example of the 1st aspect of this invention 本発明の第１態様に用いる金型を示す模式図The schematic diagram which shows the metal mold | die used for the 1st aspect of this invention 本発明の第１態様の別の例を示す模式図The schematic diagram which shows another example of the 1st aspect of this invention 埋金を用いる本発明の第１態様の一例を示す模式図Schematic diagram showing an example of the first aspect of the present invention using buried metal 押出機先端に金型を取り付けた実施態様の断面図Sectional drawing of the embodiment which attached the metal mold | die to the extruder front-end | tip 本発明の第２態様の一例を示す模式図Schematic diagram showing an example of the second aspect of the present invention 埋金を用いる本発明の第２態様の一例を示す模式図Schematic showing an example of the second aspect of the present invention using buried metal 本発明の第３態様の一例を示す模式図Schematic diagram showing an example of the third aspect of the present invention 埋金を用いる本発明の第３態様の一例を示す模式図Schematic diagram showing an example of the third aspect of the present invention using buried metal 本発明の第３態様に用いる金型の一例を示す模式図The schematic diagram which shows an example of the metal mold | die used for the 3rd aspect of this invention 比較例の金型を示す斜視図The perspective view which shows the metal mold | die of a comparative example 埋金の実施態様を示す図The figure which shows the embodiment of buried gold
　以下、本発明の熱可塑性樹脂発泡体の製造方法について、図面を参照して説明する。
（本発明の第１態様）
　本発明の熱可塑性樹脂発泡体の製造方法は、発泡剤を含む熱可塑性樹脂組成物を溶融状態で金型の入口開口部に導入し、この溶融状態の樹脂組成物を、金型に設けられた単一の細長い出口開口部から吐出して板状の熱可塑性樹脂発泡体を得るものである。
　図１～４は本発明の第１態様を示す模式図である。図１では２つ用いる金型の一方のみを示しており、同様に図３、４も説明のため、上側の金型を省略している。本発明の製造方法では、金型設計の容易さの点から図１、３、４に示すような同型の金型２つを図２のように向かい合わせ、それを図５に示すように押出機２４の先端に取り付けて使用することが好ましい。 Hereinafter, the manufacturing method of the thermoplastic resin foam of this invention is demonstrated with reference to drawings.
(First aspect of the present invention)
In the method for producing a thermoplastic resin foam of the present invention, a thermoplastic resin composition containing a foaming agent is introduced into a mold inlet opening in a molten state, and the molten resin composition is provided in the mold. A plate-like thermoplastic resin foam is obtained by discharging from a single elongated outlet opening.
1 to 4 are schematic views showing a first embodiment of the present invention. FIG. 1 shows only one of the two molds used, and similarly, FIGS. 3 and 4 also omit the upper mold for explanation. In the manufacturing method of the present invention, two molds of the same type as shown in FIGS. 1, 3 and 4 are faced as shown in FIG. 2 and extruded as shown in FIG. It is preferable to use it attached to the tip of the machine 24.
　本発明の第１態様では、樹脂発泡体の製造に使用する図１の金型１０において、金型の出口開口部１２の横幅をＬ１、入口開口部１１と出口開口部１２との距離をＤとし、並びに、入口開口部１１における樹脂流路の断面の、上記出口開口部横幅方向の長さ（横幅）をＬ２するとき、Ｌ１／Ｌ２を１．３以上とし、かつ、３＜Ｌ１／Ｄ＜２０という条件を満たすようにした上で熱可塑性樹脂を製造する。上記３つのパラメータのうち、出口開口部の横幅Ｌ１と、入口開口部と出口開口部との距離Ｄとは、金型によって決定される。このため、本発明の第１態様の実施にあたっては、『３＜Ｌ１／Ｄ＜２０』の条件を満たす金型を使用する必要がある。Ｌ１／Ｄの値が３以下であると、金型１０内で、発泡剤を含む熱可塑性樹脂組成物が、幅方向に充分広がることができず、得られる樹脂発泡体表面のうねりを低減する事ができないという問題がある。一方Ｌ１／Ｄの値が２０以上の場合、金型１０内で発泡剤を含む熱可塑性樹脂組成物の圧力が上がりすぎて適切でないという問題がある。 In the first aspect of the present invention, in the mold 10 of FIG. 1 used for manufacturing a resin foam, the lateral width of the outlet opening 12 of the mold is L1, and the distance between the inlet opening 11 and the outlet opening 12 is D. And when the length (width) of the cross section of the resin flow path in the inlet opening 11 in the outlet opening width direction is L2, L1 / L2 is set to 1.3 or more, and 3 <L1 / D A thermoplastic resin is manufactured after satisfying the condition of <20. Of the above three parameters, the lateral width L1 of the outlet opening and the distance D between the inlet opening and the outlet opening are determined by the mold. For this reason, in implementing the first aspect of the present invention, it is necessary to use a mold that satisfies the condition of “3 <L1 / D <20”. When the value of L1 / D is 3 or less, the thermoplastic resin composition containing the foaming agent cannot sufficiently spread in the width direction in the mold 10, and the undulation of the surface of the resulting resin foam is reduced. There is a problem that things can not be done. On the other hand, when the value of L1 / D is 20 or more, there is a problem that the pressure of the thermoplastic resin composition containing the foaming agent in the mold 10 is too high and is not appropriate.
　一方、入口開口部１１における樹脂流路の断面の横幅Ｌ２は、図３に示すように金型１０の入口開口部１１の形状によって決定することもできるが、図４に示されるように、金型１０の入口開口部１１の上流側に埋金２０を配置し、入口開口部１１における樹脂流路の横幅Ｌ２を狭くしてＬ１／Ｌ２を１．３以上となるようにしてもよい。Ｌ１／Ｌ２の値は、１．３以上であれば、得られる樹脂発泡体表面のうねりを実用上問題のない程度に減らすことができるが、表面をより平滑にするためには１．５以上であることが好ましく、外観に優れた発泡体を得るためには２以上とすることがより好ましい。
　本発明の第１態様により、厚み方向へのうねりの少なく、均質な寸法形状を有する樹脂発泡体を製造できる理由として、本発明者らは、溶融状態の熱可塑性樹脂が幅方向に広がりながら入口開口部１１から出口開口部１２に向かうため、発泡に伴う縦方向に広がる作用が緩和され、全周囲方向に均一に広がる発泡挙動（等方性）によるものと考えている。 On the other hand, the width L2 of the cross section of the resin flow path in the inlet opening 11 can be determined by the shape of the inlet opening 11 of the mold 10 as shown in FIG. 3, but as shown in FIG. The buried metal 20 may be disposed on the upstream side of the inlet opening 11 of the mold 10, and the lateral width L2 of the resin flow path in the inlet opening 11 may be narrowed so that L1 / L2 becomes 1.3 or more. If the value of L1 / L2 is 1.3 or more, the swell of the surface of the resulting resin foam can be reduced to a practically no problem, but 1.5 or more in order to make the surface smoother. In order to obtain a foam having an excellent appearance, it is more preferably 2 or more.
According to the first aspect of the present invention, the reason why a resin foam having a uniform size and shape with less waviness in the thickness direction can be produced by the present inventors is that the molten thermoplastic resin spreads in the width direction while being spread in the width direction. Since it goes from the opening portion 11 to the outlet opening portion 12, the effect of spreading in the vertical direction accompanying foaming is alleviated, and it is considered to be due to the foaming behavior (isotropic property) spreading uniformly in the entire circumferential direction.
　金型１０の出口開口部１２の横幅Ｌ１は、樹脂発泡体の用途により異なり一概には言えないが、通常５０ｍｍ～２０００ｍｍ程度である。入口開口部１１における樹脂流路断面の横幅Ｌ２は、Ｌ１に応じてＬ１／Ｌ２が１．３以上となるようにすればよく、金型１０自体がこの条件を満たさない場合でも埋金２０を用いることにより容易に調整することができる。
　入口開口部１１と出口開口部１２との距離Ｄは、金型１０に依存して決まるが、通常２５～５０ｍｍ程度である。 The lateral width L1 of the outlet opening 12 of the mold 10 differs depending on the use of the resin foam and cannot be generally specified, but is usually about 50 mm to 2000 mm. The width L2 of the cross section of the resin flow path at the inlet opening 11 may be set so that L1 / L2 is 1.3 or more according to L1, and even if the mold 10 itself does not satisfy this condition, It can be easily adjusted by using it.
The distance D between the inlet opening 11 and the outlet opening 12 is determined depending on the mold 10, but is usually about 25 to 50 mm.
　本発明の第１態様で使用する金型１０の出口開口部１２の縦幅Ｈ１は、通常０．０１～１０ｍｍである。０．０１ｍｍより狭いと、泡剤を含む熱可塑性樹脂の流動性が著しく悪くなることがあり、１０ｍｍより広いと、金型１０内での熱可塑性樹脂の圧力が低下し、均一な発泡体を得られないおそれがある。上記した通り、図１、３、４に示す例では上側の金型を省略しているため、図２から明らかなとおり、出口開口部１２の縦幅Ｈ１は、図１、３、４に示す金型の出口開口部１２の縦幅ｈ１を２倍した値となる。このため、出口開口部１２の断面積は、２×ｈ１×Ｌ１（＝Ｈ１×Ｌ１）となる。 The vertical width H1 of the outlet opening 12 of the mold 10 used in the first aspect of the present invention is usually 0.01 to 10 mm. If it is narrower than 0.01 mm, the fluidity of the thermoplastic resin containing the foaming agent may be remarkably deteriorated. If it is larger than 10 mm, the pressure of the thermoplastic resin in the mold 10 is lowered, and a uniform foam is obtained. May not be obtained. As described above, in the example shown in FIGS. 1, 3, and 4, the upper mold is omitted, and as is apparent from FIG. 2, the vertical width H <b> 1 of the outlet opening 12 is shown in FIGS. This is a value obtained by doubling the vertical width h1 of the outlet opening 12 of the mold. For this reason, the cross-sectional area of the outlet opening 12 is 2 × h1 × L1 (= H1 × L1).
　一方、本発明の第１態様で使用する金型１０の入口開口部１１の縦幅Ｈ２は、２～１０ｍｍであることが好ましく、４～８ｍｍであることがより好ましい。Ｈ２が２ｍｍより狭いと、該入口開口部１１での熱可塑性樹脂の圧力が高くなりすぎて発泡体の製造が滞ることがある。一方、Ｈ２が１０ｍｍより大きいと金型１０に導入される熱可塑性樹脂の量が多くなり、吐出の際の樹脂の圧力が高くなりすぎて、発泡が均一とならないおそれがある。 On the other hand, the vertical width H2 of the inlet opening 11 of the mold 10 used in the first aspect of the present invention is preferably 2 to 10 mm, and more preferably 4 to 8 mm. If H2 is narrower than 2 mm, the pressure of the thermoplastic resin at the inlet opening 11 becomes too high, and foam production may be delayed. On the other hand, if H2 is larger than 10 mm, the amount of the thermoplastic resin introduced into the mold 10 increases, and the pressure of the resin at the time of discharge becomes too high, and foaming may not be uniform.
　本発明の製造方法に使用する金型は、高温高圧の熱可塑性樹脂の流れに耐える必要があり、かつ、繰り返して長期間使用できるものであることが望ましい。このような金型の素材の例として、ステンレス鋼を挙げることができる。 The mold used in the production method of the present invention needs to withstand the flow of a high-temperature and high-pressure thermoplastic resin, and it is desirable that it can be used repeatedly for a long time. An example of such a mold material is stainless steel.
　本発明の熱可塑性樹脂発泡体の製造方法では、まず、原料となる熱可塑性樹脂を押出機に投入し、これを融点以上に加熱する。本発明に使用される熱可塑性樹脂の例として、ポリプロピレン樹脂、ポリエチレン樹脂、ポリエステル樹脂、ポリスチレン樹脂、ポリ乳酸樹脂、ポリアミド樹脂が挙げられ、これらのうちの１種類の単独重合体でもよく、２種以上を組み合わせて混合樹脂として使用してもよい。 In the method for producing a thermoplastic resin foam of the present invention, first, a thermoplastic resin as a raw material is put into an extruder and heated to the melting point or higher. Examples of the thermoplastic resin used in the present invention include polypropylene resin, polyethylene resin, polyester resin, polystyrene resin, polylactic acid resin, and polyamide resin. One of these may be a homopolymer, and two kinds The above may be combined and used as a mixed resin.
　次いで、溶融状態とした熱可塑性樹脂に発泡剤を添加する。発泡剤の例としては、二酸化炭素、窒素などの無機不活性ガス、ブタン、ペンタンなどの炭化水素系ガスが挙げられる。熱可塑性樹脂としてポリプロピレン樹脂を用いる場合には、発泡剤として超臨界状態の二酸化炭素を用いることが好ましい。この場合、押出機内部で二酸化炭素が気化することを防止するため、熱可塑性樹脂を７ＭＰａ以上の圧力に保つ必要がある。 Next, a foaming agent is added to the molten thermoplastic resin. Examples of the blowing agent include inorganic inert gases such as carbon dioxide and nitrogen, and hydrocarbon gases such as butane and pentane. When a polypropylene resin is used as the thermoplastic resin, it is preferable to use carbon dioxide in a supercritical state as the foaming agent. In this case, in order to prevent carbon dioxide from vaporizing inside the extruder, it is necessary to keep the thermoplastic resin at a pressure of 7 MPa or more.
　発泡剤を含む溶融状態の熱可塑性樹脂は、図５に矢印で示すように押出機２４から金型１０の入口開口部１１へ導入される。そして、出口開口部１２に近づきながら徐々に圧力が低下し、発泡がはじまる。熱可塑性樹脂の急激な硬化を防ぐため、金型１０をヒーターなどで硬化温度以上に保持することが好ましい。 The molten thermoplastic resin containing the foaming agent is introduced from the extruder 24 into the inlet opening 11 of the mold 10 as indicated by an arrow in FIG. Then, the pressure gradually decreases while approaching the outlet opening 12, and foaming starts. In order to prevent rapid curing of the thermoplastic resin, it is preferable to hold the mold 10 above the curing temperature with a heater or the like.
　本発明により製造される樹脂発泡体の発泡倍率は、用途にもよるが、５倍以上であることが好ましく、更には、１０倍以上であることがより好ましい。出口開口部から押出された樹脂発泡体が板体の上下方向に膨張しすぎることを防ぐため、図５に示されるように出口開口部１２の上下にガイダー２１を設けることも有効である。 The foaming ratio of the resin foam produced according to the present invention is preferably 5 times or more, more preferably 10 times or more, although it depends on the application. In order to prevent the resin foam extruded from the outlet opening from expanding too much in the vertical direction of the plate, it is also effective to provide guiders 21 above and below the outlet opening 12 as shown in FIG.
　また、樹脂発泡体の幅方向への膨張を抑え、表面のうねりを減らすため、ガイダー２１の下流側に小型ロール引取機２２を設置し、樹脂発泡体をロールで上下から挟みながら冷却することも有効である。 In order to suppress expansion of the resin foam in the width direction and reduce surface waviness, a small roll take-up machine 22 is installed on the downstream side of the guider 21, and the resin foam is cooled while being sandwiched from above and below by a roll. It is valid.
（本発明の第２態様）
　図６、７は本発明の第２態様を示す模式図である。説明のため第１態様の図１と同様に上側の金型を省略している。
　本発明の第１態様では金型の入口開口部に導入する溶融状態の熱可塑性樹脂の樹脂流路が１つであるのに対し、本発明の第２態様では、図６に示す金型１０の入口開口部１１にハッチングで示すように、金型１０に導入する熱可塑性樹脂の樹脂流路を複数とする。そして、金型１０の出口開口部１２の横幅をＬ１、入口開口部１１における樹脂流路の断面の横幅方向の長さの合計をＬ２’、入口開口部１１と出口開口部１２との距離をＤとするとき、Ｌ１／Ｌ２’を１．３以上とし、かつ、３＜Ｌ１／Ｄ＜２０とすることを特徴とする。 (Second aspect of the present invention)
6 and 7 are schematic views showing a second embodiment of the present invention. For the sake of explanation, the upper mold is omitted as in FIG. 1 of the first embodiment.
In the first aspect of the present invention, there is one resin flow path of the molten thermoplastic resin introduced into the inlet opening of the mold, whereas in the second aspect of the present invention, the mold 10 shown in FIG. As shown by hatching in the inlet opening 11, a plurality of resin flow paths for the thermoplastic resin introduced into the mold 10 are provided. The width of the outlet opening 12 of the mold 10 is L1, the total length in the width direction of the cross section of the resin flow path in the inlet opening 11 is L2 ′, and the distance between the inlet opening 11 and the outlet opening 12 is When D, L1 / L2 ′ is 1.3 or more, and 3 <L1 / D <20.
　すなわち、Ｌ１、Ｌ２’およびＤが上記条件を満たす場合にも、本発明の第１態様と同様に、表面にうねりの少ない平滑な熱可塑性樹脂発泡体を得ることができる。本発明者らは、この理由として、本発明の第１態様と同様に、溶融状態の熱可塑性樹脂が幅方向に広がりながら入口開口部から出口開口部に向かうため、発泡に伴う縦方向に広がる作用を緩和できるためであると考えている。 That is, even when L1, L2 'and D satisfy the above conditions, a smooth thermoplastic resin foam with less surface undulation can be obtained as in the first embodiment of the present invention. As a reason for this, the present inventors, like the first aspect of the present invention, spread in the longitudinal direction accompanying foaming because the molten thermoplastic resin extends from the inlet opening to the outlet opening while spreading in the width direction. This is thought to be because the action can be mitigated.
　導入口を複数とする方法としては、金型に複数の入口開口部を設けてもよいが、図７に示すように、金型１０の入口開口部の上流側に、複数の開口を有する埋金２０を配置することがより好ましい。埋金２０を使用することにより、金型を作製するコストと時間を省き、簡便に導入口を複数にできる利点がある。第２態様における樹脂流路の数に特に制限はないが、２～１０であることが好ましい。図１２Ｃに樹脂流路数が２の埋金の一例を示す。 As a method of using a plurality of inlets, a mold may be provided with a plurality of inlet openings, but as shown in FIG. 7, a buried mold having a plurality of openings upstream of the inlet openings of the mold 10 is used. More preferably, the gold 20 is disposed. By using the buried metal 20, there is an advantage that the cost and time for producing a mold can be saved, and a plurality of introduction ports can be easily provided. The number of resin flow paths in the second embodiment is not particularly limited, but is preferably 2 to 10. FIG. 12C shows an example of a buried metal with two resin flow paths.
（本発明の第３態様）
　図８～１０は本発明の第３態様を示す模式図である。説明のため第１態様の図１と同様に上側の金型を省略している。
　本発明の第３態様では、第１態様と同様にＬ１／Ｌ２を１．３以上、３＜Ｌ１／Ｄ＜２０とすることに加え、図８に示されるように入口開口部１１における樹脂流路断面の縦幅について、横幅方向の、両端部の縦幅Ｈ２より中央部の縦幅Ｈ３を狭くすることを特徴とする。 (Third aspect of the present invention)
8 to 10 are schematic views showing a third embodiment of the present invention. For the sake of explanation, the upper mold is omitted as in FIG. 1 of the first embodiment.
In the third aspect of the present invention, L1 / L2 is set to 1.3 or more and 3 <L1 / D <20 as in the first aspect, and the resin flow in the inlet opening 11 as shown in FIG. About the vertical width of a road section, the vertical width H3 of the center part is made narrower than the vertical width H2 of both ends of the horizontal width direction.
　このように、入口開口部における樹脂流路断面の縦幅について、Ｈ２＞Ｈ３とすることによっても、表面にうねりが少なく平滑な熱可塑性樹脂発泡体を得ることができる。本発明者らは、この理由として、本発明の第３態様では金型の中央部への熱可塑性樹脂の供給量が少ないため、熱可塑性樹脂が発泡する際の圧力を縦方向ではなく、横幅方向を含めた全周囲方向に振り向けることができるので、縦方向へのうねりが軽減された、均一な寸法形状を有する樹脂発泡体が得られると考えている。 Thus, a smooth thermoplastic resin foam with less undulation on the surface can also be obtained by setting H2> H3 for the vertical width of the resin flow path cross section at the inlet opening. The reason for this is that, in the third aspect of the present invention, since the amount of thermoplastic resin supplied to the central portion of the mold is small, the pressure when the thermoplastic resin foams is not in the vertical direction, but in the horizontal width. Since it can be turned in all directions including the direction, it is considered that a resin foam having a uniform dimensional shape with reduced waviness in the vertical direction can be obtained.
　本発明の第３態様の一例として、図８に示されるように、金型１０の入口開口部１１での樹脂流路断面を、中央部を縦幅Ｈ３のスリットとし、その両端の縦幅をより広くしてＨ字形状に形成することが挙げられる。このような樹脂流路断面は、図９に示される形状の埋金２０を用いることにより形成することができる。また、図１０に示されるように、埋金を用いずに金型１０の入口開口部１１の形状を本発明の第３態様の条件を満たすように形成してもよい。図１０の金型１０は、入口開口部１１の両端部で縦幅が最も広く（ｈ２＝２．５ｍｍ）、そこから中央部に向かって次第に縦幅が狭くなり、中央部で縦幅が最も狭くなる（ｈ３＝０．２５ｍｍ）構造である。図１２Ｂに、本発明の第３態様に用いることのできる埋金の一例を示す。 As an example of the third aspect of the present invention, as shown in FIG. 8, the cross section of the resin flow path at the inlet opening 11 of the mold 10 is a slit having a vertical width H3 at the center, and the vertical widths at both ends thereof. It can be made wider and formed into an H shape. Such a resin channel cross section can be formed by using the buried metal 20 having the shape shown in FIG. Further, as shown in FIG. 10, the shape of the inlet opening 11 of the mold 10 may be formed so as to satisfy the condition of the third aspect of the present invention without using buried metal. The mold 10 in FIG. 10 has the widest vertical width at both ends of the inlet opening 11 (h2 = 2.5 mm), the vertical width gradually decreases from the center toward the central portion, and the vertical width is the largest at the central portion. The structure is narrow (h3 = 0.25 mm). FIG. 12B shows an example of the buried metal that can be used in the third aspect of the present invention.
（実施例１）
　図１０に示す金型２つを向かい合わせて固定し、この金型の入口開口部１１と、図１２Ｆに示す埋金の開口部とが重なるように配置して、これらの金型と埋金を押出機の先端に取り付けて、板状のポリプロピレン樹脂発泡体を製造した。上記金型における出口開口部の長手方向の幅（横幅）Ｌ１は２６０ｍｍ、入口開口部と出口開口部との距離Ｄは４９．４ｍｍ、入口開口部における樹脂流路断面の横幅Ｌ２は１００ｍｍであり、Ｌ１／Ｌ２は２．６、Ｌ１／Ｄは５．２６である。なお、押出機吐出量は２０ｋｇ／ｈ、発泡剤としての二酸化炭素供給量は０．７８ｋｇ／ｈ、二酸化炭素添加量３．８質量％、金型の入口開口部における樹脂圧力は１０ＭＰａとした。
　得られた板状のポリプロピレン樹脂発泡体の発泡倍率、厚み、厚みＣｖ値を表１に示す。なお、厚みＣｖ値とは、熱可塑性樹脂発泡体の厚みを、１ｍ2あたり２５点で測定した場合の（標準偏差）／（平均値）のことであり、この値が少ないほど、厚み方向のうねりが少なく、表面が平滑であることを意味する。 Example 1
The two molds shown in FIG. 10 are fixed face to face, and the inlet opening 11 of this mold and the buried opening shown in FIG. 12F are arranged so as to overlap with each other. Was attached to the tip of the extruder to produce a plate-like polypropylene resin foam. The width (lateral width) L1 in the longitudinal direction of the outlet opening in the mold is 260 mm, the distance D between the inlet opening and the outlet opening is 49.4 mm, and the lateral width L2 of the resin flow path cross section at the inlet opening is 100 mm. , L1 / L2 is 2.6, and L1 / D is 5.26. The discharge rate of the extruder was 20 kg / h, the supply amount of carbon dioxide as a blowing agent was 0.78 kg / h, the addition amount of carbon dioxide was 3.8% by mass, and the resin pressure at the inlet opening of the mold was 10 MPa.
Table 1 shows the expansion ratio, thickness, and thickness Cv value of the obtained plate-like polypropylene resin foam. The thickness Cv value is (standard deviation) / (average value) when the thickness of the thermoplastic resin foam is measured at 25 points per 1 m 2 . It means less undulation and a smooth surface.
Figure JPOXMLDOC01-appb-I000001
Figure JPOXMLDOC01-appb-I000001
（比較例１）
　金型として出口開口部の横幅Ｌ１と入口開口部の横幅とが等しい図１１に記載の金型を使用し、埋金を使用しなかったこと以外は実施例１と同様にしてポリプロピレン樹脂発泡体を製造した。得られた樹脂発泡体の発泡倍率、厚み、厚みＣｖ値を表１に示す。なお、比較例１のＬ１／Ｌ２は１．０、Ｌ１／Ｄは約５．２６である。
　表１に示す結果から、入口開口部における樹脂流路断面の横幅を狭くし、Ｌ１／Ｌ２の値を大きくすることにより、得られる発泡体の厚みＣｖ値が大きく低下し、うねりの少ない平滑な発泡体を製造できることが示された。実施例１で得られた発泡体は、うねりが少なく外観も優れていた。 (Comparative Example 1)
A polypropylene resin foam was used in the same manner as in Example 1 except that the mold shown in FIG. 11 having the same width L1 at the outlet opening and the width at the inlet opening was used as the mold, and no buried metal was used. Manufactured. Table 1 shows the expansion ratio, thickness, and thickness Cv value of the obtained resin foam. In Comparative Example 1, L1 / L2 is 1.0, and L1 / D is about 5.26.
From the results shown in Table 1, by reducing the width of the cross section of the resin flow path at the inlet opening and increasing the value of L1 / L2, the thickness Cv value of the obtained foam is greatly reduced, and smoothness with less waviness is obtained. It has been shown that foams can be produced. The foam obtained in Example 1 had few undulations and was excellent in appearance.
１０．金型
１１．入口開口部
１２．出口開口部
２０．埋金
２１．ガイダー
２２．小型ロール引取機
２３．シボロール
２４．押出機
Ｄ．入口開口部と出口開口部との距離
Ｈ１．金型の出口開口部の縦幅
Ｈ２．金型の入口開口部の縦幅
Ｈ３．金型の入口開口部の中央部の縦幅
Ｌ１．金型の出口開口部の横幅
Ｌ２．入口開口部における樹脂流路断面の横幅
Ｌ２’．入口開口部における樹脂流路の断面の横幅方向の長さの合計
ｈ１．片方の金型の出口開口部の縦幅
ｈ２．片方の金型の入口開口部の縦幅
ｈ３．片方の金型の入口開口部の中央部の縦幅 10. Mold 11. Inlet opening 12. Outlet opening 20. Burial 21. Guider 22. Small roll take-up machine 23. Shivoroll 24. Extruder D. Distance between the inlet opening and the outlet opening H1. Vertical width H2 of outlet opening of mold. Vertical width H of the mold inlet opening H3. Vertical width L1 of the central part of the inlet opening of the mold. The width L2 of the outlet opening of the mold. The width L2 ′. Total length in the width direction of the cross section of the resin flow path at the inlet opening h1. Vertical width h2 of outlet opening of one mold. Vertical width h1 of the inlet opening of one mold. Vertical width of the center of the entrance opening of one mold

Claims (3)

  1. 　金型に設けられた入口開口部から発泡剤を含む熱可塑性樹脂組成物を溶融状態で流して導入し、該組成物を上記金型に設けられた細長い出口開口部から吐出させて板状の発泡体を形成する熱可塑性樹脂発泡体の製造方法において、
    上記金型の出口開口部の横幅をＬ１、
    上記入口開口部における樹脂流路の断面の、上記出口開口部横幅方向の長さをＬ２、
    上記入口開口部と出口開口部との距離をＤとするとき、
    Ｌ１／Ｌ２を１．３以上とし、かつ、３＜Ｌ１／Ｄ＜２０とすることを特徴とする熱可塑性樹脂発泡体の製造方法。     A thermoplastic resin composition containing a foaming agent is introduced in a molten state through an inlet opening provided in the mold, and the composition is discharged from an elongated outlet opening provided in the mold to form a plate-like shape. In the method for producing a thermoplastic resin foam for forming a foam,
    The width of the outlet opening of the mold is L1,
    The length of the cross section of the resin flow path at the inlet opening in the width direction of the outlet opening L2
    When the distance between the inlet opening and the outlet opening is D,
    A method for producing a thermoplastic resin foam, wherein L1 / L2 is 1.3 or more and 3 <L1 / D <20.
  2. 　金型に設けられた入口開口部から発泡剤を含む熱可塑性樹脂組成物を溶融状態で流して導入し、該組成物を上記金型に設けられた細長い出口開口部から吐出させて板状の発泡体を形成する熱可塑性樹脂発泡体の製造方法において、
    複数の樹脂流路から上記溶融状態の樹脂組成物を上記入口開口部に導入し、
    上記金型の出口開口部の横幅をＬ１、
    上記入口開口部における樹脂流路の断面の、上記出口開口部横幅方向の長さの合計をＬ２’、
    上記入口開口部と出口開口部との距離をＤとするとき、
    Ｌ１／Ｌ２’を１．３以上とし、かつ、３＜Ｌ１／Ｄ＜２０とすることを特徴とする熱可塑性樹脂発泡体の製造方法。     A thermoplastic resin composition containing a foaming agent is introduced in a molten state through an inlet opening provided in the mold, and the composition is discharged from an elongated outlet opening provided in the mold to form a plate-like shape. In the method for producing a thermoplastic resin foam for forming a foam,
    Introducing the molten resin composition into the inlet opening from a plurality of resin flow paths;
    The width of the outlet opening of the mold is L1,
    The total length of the cross section of the resin flow path in the inlet opening in the width direction of the outlet opening is L2 ′,
    When the distance between the inlet opening and the outlet opening is D,
    A method for producing a thermoplastic resin foam, wherein L1 / L2 ′ is 1.3 or more and 3 <L1 / D <20.
  3. 　金型に設けられた入口開口部から発泡剤を含む熱可塑性樹脂組成物を溶融状態で流して導入し、該組成物を上記金型に設けられた細長い出口開口部から吐出させて板状の発泡体を形成する熱可塑性樹脂発泡体の製造方法において、
    上記金型の出口開口部の横幅をＬ１、
    上記入口開口部における樹脂流路の断面の、上記出口開口部横幅方向の長さ（横幅）をＬ２、
    上記入口開口部と出口開口部との距離をＤとするとき、
    Ｌ１／Ｌ２を１．３以上、３＜Ｌ１／Ｄ＜２０とし、かつ上記入口開口部における樹脂流路の断面の横幅方向の、中央部における縦幅Ｈ３を両端部における縦幅Ｈ２より狭くすることを特徴とする熱可塑性樹脂発泡体の製造方法。     A thermoplastic resin composition containing a foaming agent is introduced in a molten state through an inlet opening provided in the mold, and the composition is discharged from an elongated outlet opening provided in the mold to form a plate-like shape. In the method for producing a thermoplastic resin foam for forming a foam,
    The width of the outlet opening of the mold is L1,
    The length (width) of the cross section of the resin flow path at the inlet opening in the width direction of the outlet opening is L2,
    When the distance between the inlet opening and the outlet opening is D,
    L1 / L2 is 1.3 or more, 3 <L1 / D <20, and the vertical width H3 at the center in the horizontal width direction of the cross section of the resin flow path at the inlet opening is narrower than the vertical width H2 at both ends. A method for producing a thermoplastic foam.
PCT/JP2012/062099 2011-05-12 2012-05-11 Method for producing thermoplastic resin foam body WO2012153829A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2013514064A JP5981422B2 (en) 2011-05-12 2012-05-11 Method for producing thermoplastic resin foam

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011107629 2011-05-12
JP2011-107629 2011-05-12

Publications (1)

Publication Number Publication Date
WO2012153829A1 true WO2012153829A1 (en) 2012-11-15

Family

ID=47139303

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2012/062099 WO2012153829A1 (en) 2011-05-12 2012-05-11 Method for producing thermoplastic resin foam body

Country Status (2)

Country Link
JP (1) JP5981422B2 (en)
WO (1) WO2012153829A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3920876A (en) * 1972-05-19 1975-11-18 Hoechst Ag Process for the manufacture of shaped bodies from cellular thermoplastic materials
JP2001158036A (en) * 1999-12-06 2001-06-12 Mitsubishi Heavy Ind Ltd Die for molding foamed sheet
JP2008302678A (en) * 2007-06-11 2008-12-18 Asahi Fiber Glass Co Ltd Thermoplastic resin foam and its manufacturing method

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1067043A (en) * 1996-08-28 1998-03-10 Sekisui Plastics Co Ltd Manufacture of thermoplastic resin foam panel and mold therefor
JPH1177794A (en) * 1997-09-02 1999-03-23 Japan Steel Works Ltd:The Continuous foam producing method and die therefor
JP2001277329A (en) * 2000-01-25 2001-10-09 Kanegafuchi Chem Ind Co Ltd Method for manufacturing foamed board
JP2002273778A (en) * 2001-03-19 2002-09-25 Sekisui Chem Co Ltd Breaker plate, and manufacturing method for sheet-form molded article
JP4032990B2 (en) * 2003-02-19 2008-01-16 住友化学株式会社 Multi-layer foam sheet manufacturing apparatus and multi-layer foam sheet manufacturing method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3920876A (en) * 1972-05-19 1975-11-18 Hoechst Ag Process for the manufacture of shaped bodies from cellular thermoplastic materials
JP2001158036A (en) * 1999-12-06 2001-06-12 Mitsubishi Heavy Ind Ltd Die for molding foamed sheet
JP2008302678A (en) * 2007-06-11 2008-12-18 Asahi Fiber Glass Co Ltd Thermoplastic resin foam and its manufacturing method

Also Published As

Publication number Publication date
JPWO2012153829A1 (en) 2014-07-31
JP5981422B2 (en) 2016-08-31

Similar Documents

Publication Publication Date Title
US11945149B2 (en) Coextruded articles, dies and methods of making the same
JP5301238B2 (en) Method for producing thermoplastic resin foam
JP2009504450A5 (en)
KR20130096156A (en) Film production device and production method
US20130259965A1 (en) Varying transition zone manifold
US20210260806A1 (en) Coextruded articles, dies and methods of making the same
WO2014069110A1 (en) Method and device for manufacturing resin laminate
JP5981422B2 (en) Method for producing thermoplastic resin foam
WO2008054061A1 (en) Method for preparation of microcellular foam with uniform foaming ratio and extruding and foaming system for the same
FI82212C (en) ANORDNING OCH FOERFARANDE FOER FRAMSTAELLNING AV EN MULTI-CELL-SKUMPLASTSKIVA AV THERMOPLAST.
TWI377123B (en)
JP2001009894A (en) Foamed sheet molding die and foamed sheet molding apparatus
JP2001158036A (en) Die for molding foamed sheet
JPWO2021095727A5 (en)
JP2013022808A (en) Die plate and method for manufacturing thermoplastic resin foam using the same
JP5186136B2 (en) Thermoplastic resin foam and method for producing the same
JP2017122184A (en) Styrenic resin foam sheet and method for producing the same, and food packaging container
JP5309517B2 (en) Foam sheet manufacturing equipment
JP2007045020A (en) Flat die and manufacturing method of laminated resin film or sheet
CN105216267A (en) A kind of broadsheet efficient uniform extruder head and extrusion method
KR102605803B1 (en) Manufacturing Apparatus Of PTFE Thick Film For Pipe Protection
KR102523328B1 (en) Longitudinal continuous manufacturing apparatus for multi-tube panel
JP3667655B2 (en) Extruded foam composite manufacturing equipment
KR101070532B1 (en) Dies for foaming machine
JP3330541B2 (en) Flat die for extrusion foam molding and extrusion molding method of foam sheet using the same

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 12782182

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2013514064

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 12782182

Country of ref document: EP

Kind code of ref document: A1