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    • 3. 发明申请
    • METHOD AND APPARATUS FOR MAKING LARGE SIZE,LOW DENSITY,ELONGATED THERMOPLASTIC CELLULAR BODIES
    • 制造大尺寸,低密度,长寿命热塑性细胞体的方法和装置
    • WO1982000440A1
    • 1982-02-18
    • PCT/US1981001050
    • 1981-08-05
    • VALCOUR IMPRINTED PAPERS INCCOLLINS F
    • VALCOUR IMPRINTED PAPERS INC
    • B29D27/00
    • B29C44/421Y10S264/66
    • Procede de production de corps cellulaires thermoplastiques allonges, de grandes dimensions, de faible densite, consistant a former un melange d'un polymere thermoplastique et d'un agent de soufflage dissout dans celui-ci sous pression et a une temperature a laquelle la viscosite du melange peut augmenter, a extruder ce melange dans une zone ou regnent des conditions qui empechent le melange de mousser, la zone ayant un orifice matriciel de sortie (7) debouchant dans une zone ou la pression et la temperature sont inferieures et ou ce melange mousse et une porte pouvant etre actionnee (8) pour fermer l'orifice matriciel (7); l'ouverture periodique de cette porte (8) et l'application sensiblement simultanee d'une pression mecanique par un piston mobile (3) sur le melange, de preference en raclant les parois laterales de la zone avec ce piston (3), pour ejecter le melange de la zone au travers de l'orifice matriciel (7) a une vitesse superieure a la vitesse a laquelle se produit un moussage dans l'orifice matriciel (7) et inferieure a la vitesse a laquelle des irregularites sensibles dans la zone ou forme de la section transversale du corps cellulaire se produisent; et a permettre au melange ejecte de se dilater librement dans au moins une dimension pour produire le corps cellulaire thermoplastique allonge. L'appareil de production de corps cellulaires thermoplastiques allonges comprend un dispositif d'extrusion (1) pour l'alimentation en un melange d'un polymere thermoplastique et d'un agent de soufflage plastifiant a une temperature appropriee pour produire un corps cellulaire lorsque le melange est soumis a une pression plus basse, une chambre de contenance expansible (2) recevant ce melange depuis le dispositif d'extrusion et maintenant le melange dans un etat en fusion a une pression superieure a sa pression de moussage, des moyens formant piston (3) pour ejecter le melange hors de la chambre (2), une matrice (6) ayant un orifice (7), de preference en alignement avec le mouton (3), au travers duquel le melange
    • 用于生产大尺寸,低密度,细长的热塑性细胞体的方法,包括以下步骤:在压力下和在混合物的粘度足以保持发泡剂的温度下形成溶解在其中的热塑性聚合物和发泡剂的混合物 当允许混合物膨胀时,在防止所述混合物发泡的条件下将所述混合物挤出到保持区中,所述保持区具有开口到所述混合物发泡的较低压力和温度区域的出口模孔,以及可打开的浇口 关闭模孔; 周期性地打开所述门并且基本上同时地通过混合物上的可移动压头施加机械压力,优选地在用所述压头刮擦保持区域的侧面时,以超过其的速率将混合物从保持区域通过模孔喷射出来。 发生模口中的大量发泡并且小于细胞体的横截面积或形状发生显着不规则的情况; 并且允许喷射的混合物在至少一个维度上不受限制地膨胀以产生细长的热塑性细胞体。 用于生产细长型热塑性细胞体的装置,包括用于在混合物经受较低压力时适于产生细胞体的温度进料热塑性聚合物和增塑发泡剂的混合物的挤出机; 从挤出机接收所述混合物并将混合物保持在高于其发泡压力的压力下的熔融状态的可膨胀保持室,用于将混合物排出室的压头装置; 模具,其具有优选地与压头装置成一直线的孔口,混合物通过该压头装置的操作而被喷射;门装置接触模具的外表面,用于在保持室正在被封闭和密封模孔口的同时 填充。
    • 8. 发明专利
    • METHOD AND APPARATUS FORMAKING LARGE SIZE LOW DENSITY ELONGATED THERMOPLASTIC CELLULAR BODIES
    • GB2091161A
    • 1982-07-28
    • GB8206832
    • 1981-08-05
    • VALCOUR IMPRINTED PAPERS INC
    • B29C47/54B29C44/00B29C44/42B29C44/50B29C48/30B29K105/04B29D27/00B29F3/014
    • Method for producing large size, low density, elongated thermoplastic cellular bodies comprising the steps of forming a mixture of a thermoplastic polymer and a blowing agent dissolved therein under pressure and at a temperature at which the viscosity of the mixture is sufficient to retain the blowing agent when the mixture is allowed to expand, extruding said mixture into a holding zone under conditions that prevent said mixture from foaming, the holding zone having an outlet die orifice opening into a zone of lower pressure and temperature at which said mixture foams and an openable gate closing the die orifice; periodically opening said gate and substantially concurrently applying mechanical pressure by a movable ram on the mixture, preferably while scraping the sides of the holding zone with said ram, to eject the mixture from the holding zone through the die orifice at a rate in excess of that at which substantial foaming in the die orifice occurs and less than that at which substantial irregularities in the cross-sectional area or shape of the cellular body occurs; and permitting the ejected mixture to expand unrestrained in at least one dimension to produce the elongated thermoplastic cellular body. Apparatus for producing elongated thermoplastic cellular bodies comprising an extruder for feeding a mixture of thermoplastic polymer and plasticizing blowing agent at a temperature suitable for producing a cellular body when the mixture is subjected to lower pressure; an expandable holding chamber receiving said mixture from the extruder and maintaining the mixture in a molten state at a pressure above the foaming pressure thereof, ram means for ejecting the mixture out of the chamber; a die having an orifice, preferably in line with the ram means, through which the mixture is ejected by operation of the ram means, and gate means contacting the exterior surface of the die for closing and sealing the die orifice while the holding chamber is being filled.
    • 9. 发明专利
    • NL8120298A
    • 1982-07-01
    • NL8120298
    • 1981-08-05
    • VALCOUR IMPRINTED PAPERS INC
    • B29C47/54B29C44/00B29C44/42B29C44/50B29C48/30B29K105/04B29D27/00B29F3/014
    • Method for producing large size, low density, elongated thermoplastic cellular bodies comprising the steps of forming a mixture of a thermoplastic polymer and a blowing agent dissolved therein under pressure and at a temperature at which the viscosity of the mixture is sufficient to retain the blowing agent when the mixture is allowed to expand, extruding said mixture into a holding zone under conditions that prevent said mixture from foaming, the holding zone having an outlet die orifice opening into a zone of lower pressure and temperature at which said mixture foams and an openable gate closing the die orifice; periodically opening said gate and substantially concurrently applying mechanical pressure by a movable ram on the mixture, preferably while scraping the sides of the holding zone with said ram, to eject the mixture from the holding zone through the die orifice at a rate in excess of that at which substantial foaming in the die orifice occurs and less than that at which substantial irregularities in the cross-sectional area or shape of the cellular body occurs; and permitting the ejected mixture to expand unrestrained in at least one dimension to produce the elongated thermoplastic cellular body. Apparatus for producing elongated thermoplastic cellular bodies comprising an extruder for feeding a mixture of thermoplastic polymer and plasticizing blowing agent at a temperature suitable for producing a cellular body when the mixture is subjected to lower pressure; an expandable holding chamber receiving said mixture from the extruder and maintaining the mixture in a molten state at a pressure above the foaming pressure thereof, ram means for ejecting the mixture out of the chamber; a die having an orifice, preferably in line with the ram means, through which the mixture is ejected by operation of the ram means, and gate means contacting the exterior surface of the die for closing and sealing the die orifice while the holding chamber is being filled.