OPTICAL SHEET FORMING APPARATUS AND OPTICAL SHEET FORMING METHOD

An optical sheet forming technique comprises: an extrusion unit (9) with a discharge slit (18); a forming roll unit (10) with rolls (15, 16 and 17) that are capable of rotating centered on rotation axes; a thick section-forming groove (19) provided on the forming roll unit; and a position adjustment...

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Bibliographische Detailangaben
Hauptverfasser:	YAMAMURO YUTA, MIZUNUMA KOJI, YUKAWA DAICHI
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES 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:	An optical sheet forming technique comprises: an extrusion unit (9) with a discharge slit (18); a forming roll unit (10) with rolls (15, 16 and 17) that are capable of rotating centered on rotation axes; a thick section-forming groove (19) provided on the forming roll unit; and a position adjustment mechanism (12) capable of adjusting the position of the discharge slit (18) with respect to the thick section-forming groove. On a discharged molten resin (13a), neck-in sections (13p) generated by the neck-in phenomenon are continuously configured along the extrusion direction (Fp). A neck-in section (13p) is positioned so as to face the thick section-forming groove (19) by the position adjustment mechanism (12). 光学片材成型技术具有：挤出单元(9)，上述挤出单元(9)具有排出用狭缝(18)；成型辊单元(10)，上述成型辊单元(10)具有能以转轴为中心旋转的辊(15、16、17)；厚壁部成型槽(19)，上述厚壁部成型槽(19)设于成型辊单元；以及位置调节机构(12)，上述位置调节机构(12)能对排出用狭缝(18)相对于厚壁部成型槽的位置进行调节。在排出的熔融树脂(13a)中沿挤出方向(Fp)连续地构成有颈缩部(13p)，上述颈缩部(13p)是由于颈缩现象而产生的。颈缩部(13p)被位置调节机构(12)定位成与厚壁部成型槽(19)相对。