Abstract: The object of the present invention is to cool forcibly the upper and the lower clamp portions of the parson using the upper and the lower blow holes of respective needle blow nozzle synchronously, the metallic mold is cooled by using the cooling apparatus inside the wall, thereby shorten molding cycle time and stabilize the quality. The blow molding method and apparatus, and metallic mold and needle blow nozzle of the present invention are constructed so that an upper and a lower needle blow nozzles (1a, 1) are inserted into said parison (59) to cool respective clamp portion (59c, 59d) forcibly, the discharge nozzle (1b) discharge air, and the molding parson (59) in the internal side of the metallic mold (40A) is cooled by the cooling apparatus (600) disposed inside of the metallic mold (40A), so as to shorten molding cycle time.

Abstract: The present invention relates to a method for taking out a molded product and an apparatus for the same. Use a chucking fixture (60) with claws (67a, 67b) which may clamp a upper extending portion (52A) of the molded product (52), is mounted on a robot arm (52a) of a taking out robot (55) and then said molded product (52) can be taken out by force produced by the molds (11) for separating the product (52) from the molds (11) through making chucking arms (66a-66d) with claws (67a, 67b) be in a state of moving along the horizontal direction without to bring load to between the product (52) and the upper extending portion (52A) thereof.

Abstract: The object of the present invention is to cool forcibly the upper and the lower clamp portions of the parson using the upper and the lower blow holes of respective needle blow nozzle synchronously, the metallic mold is cooled by using the cooling apparatus inside the wall, thereby shorten molding cycle time and stabilize the quality. The blow molding method and apparatus, and metallic mold and needle blow nozzle of the present invention are constructed so that an upper and a lower needle blow nozzles (1a, 1) are inserted into said parison (59) to cool respective clamp portion (59c, 59d) forcibly, the discharge nozzle (1b) discharge air, and the molding parson (59) in the internal side of the metallic mold (40A) is cooled by the cooling apparatus (600) disposed inside of the metallic mold (40A), so as to shorten molding cycle time.

Abstract: A forced exhaust pipe is connected to an exhaust pipe connected with a cross head so that a negative pressure may be formed within an air passage so as to effect rapid control of air pressure (amount) within a parison, thereby stabilizing the air pressure within the parison. A parison stabilizing method and a system therefor for use in a hollow formation molding machine, according to the present invention, are so formed that a forced air-discharge is carried out through an exhaust pipe connected with the air passage formed within the cross head, so that a negative pressure is formed within the air passage. In this way, the above-mentioned system can effect quick control of an air pressure (amount) within the prison during a pre-blowing treatment, shorten a time period necessary for determining molding conditions, without having to increase the inner diameter of the air passage.

Abstract: In a conventional multilayer crosshead, only one pressure sensor is disposed in the inlet of the annular passage, preventing monitoring of membrane discontinuities; parison thickness is not constant; as the crosshead body is not cooled and parison temperature is high, a long time is required for cooling during blow molding, preventing the reduction of the molding cycle. A multilayer crosshead according to the present invention includes pressure sensors disposed in at least two positions of the annular passage so that the flow rate is controlled and monitored so as to eliminate the pressure difference between the pressure sensors, and parison temperature is lowered to a greater degree by a cooling jacket with a built-in heater disposed in the crosshead body so that a blow molding cycle is shortened.

Abstract: In a conventional needle blow nozzle and blow molding apparatus, because a needle portion is formed to have a linear tip, resistance against insertion of the nozzle into a parison is large and only a small-diameter needle blow nozzle can be inserted into the parison. For this reason, it has been difficult to increase an amount of air supplied to the interior of the parison and to shorten the molding cycle. With a needle blow nozzle, an air cooling method and apparatus, a blow molding method and apparatus, and a blow molded product according to the present invention, since a needle portion of the needle blow nozzle is formed into an umbrella-like shape, the tip of the needle portion provides a pointed needle center so that resistance against insertion of the nozzle into a parison is reduced and a large-diameter needle blow nozzle can be employed.

Abstract: In a conventional multilayer crosshead, only one pressure sensor is disposed in the inlet of the annular passage, preventing monitoring of membrane discontinuities; parison thickness is not constant; as the crosshead body is not cooled and parison temperature is high, a long time is required for cooling during blow molding, preventing the reduction of the molding cycle. A multilayer crosshead according to the present invention includes pressure sensors disposed in at least two positions of the annular passage so that the flow rate is controlled and monitored so as to eliminate the pressure difference between the pressure sensors, and parison temperature is lowered to a greater degree by a cooling jacket with a built-in heater disposed in the crosshead body so that a blow molding cycle is shortened.

Abstract: The present invention provides a laminated-parison extrusion-molding apparatus which includes a head body; a multi-ring structure having a spider provided in the head body; a head core provided inside the multi-ring structure; an outer cylinder member provided surrounding a lower outer periphery of the multi-ring structure, the outer cylinder member constituting a lower portion of the head body; and an annular member provided inside the outer cylinder member, wherein an outer main material is supplied to a flow passage provided between the outer cylinder member and the annular member so as to achieve an outer main material layer having a uniform thickness.