| 摘要 |
PURPOSE:To produce continuously a laminated product including a foamed layer even if a sizing machine is not used, by a method wherein synthetic resin raw materials are heated and agitated by putting them into a heating and agitating tank, to which a foaming material is added and mixed up with each other directly before gelation, the gelation is suspended by loading into a cooling and agitating tank, and is supplied to a continuous extrusion machine for molding a foamed layer. CONSTITUTION:In the case where a laminated skirt, for example, made of vinyl chloride is manufactured, vinyl chloride raw materials according to a normal prescription, and being composed of resin, calcium carbide, a plasticizer and a pigment, are heated and agitated by loading them into a heating and agitating tank 1, to begin with. Then a designated quantity of foamed material is added and agitated for about a minute before gelatinization, the same is transferred to a cooling and agitating tank 3 by opening a reed valve 2 by keeping a semigelatinized state as it is and cooled. A major part of foaming progresses, and a degased, foamed and unfoamed materials are mixed with pelletlike raw materials which are to be discharged through a reed valve 4, and the raw materials to be supplied to a continuous extrusion machine 6 become ones whose foaming force is weakened. Therefore, products whose form is well-regulated can be manufactured continuously even if a sizing machine is not used. |
