SCREW FOR INJECTION MOLDING MACHINE FOR FOAM MOLDING, AND INJECTION MOLDING MACHINE

The present invention relates to a screw (3) of an injection molding machine (1) in which a first compression sector (5), a starvation sector (6), and a second compression sector (7) are formed in a heating cylinder (2), and in which an inert gas is introduced into the starvation sector (6). In the...

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Bibliographische Detailangaben
Hauptverfasser:	TAMADA KOICHI, NAKAJIMA HIDEAKI, NAITO AKIHIRO, ARAKI KATSUYUKI, UEZONO HIROMASA
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING PERFORMING OPERATIONS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	The present invention relates to a screw (3) of an injection molding machine (1) in which a first compression sector (5), a starvation sector (6), and a second compression sector (7) are formed in a heating cylinder (2), and in which an inert gas is introduced into the starvation sector (6). In the present invention, a barrier flight (13), which is a double flight comprising a combination of a main flight (14) and a sub-flight (15) having a large lead angle, is provided in a part of the screw (3) corresponding to the first compression sector (5), and a dam flight (18) assuming a ring shape having a prescribed width is provided downstream of, that is, in front of the barrier flight (13). A seal construction (20) for preventing backflow of resin may be provided between the dam flight (18) and the starvation sector (6). 将在加热缸(2)内形成第一压缩区间(5)、饥饿区间(6)以及第二压缩区间(7)且在饥饿区间(6)注入惰性气体的注射成型机(1)的螺杆(3)作为对象。在本发明中，在螺杆(3)的与第一压缩区间(5)对应的部分，设置由主螺棱(14)和导程角大的副螺棱(15)的组合构成的双螺棱即屏障螺棱(13)，在其下游即前方设置呈规定宽度的环状的阻塞螺棱(18)。在阻塞螺棱(18)与饥饿区间(6)之间，也可以