MOLTEN RESIN TRANSFER TUBULAR BODY WITH OBSERVATION WINDOW

PROBLEM TO BE SOLVED: To prevent the breakage of a glass of an observation window of a molten resin transfer tubular body. SOLUTION: An observation window 7 for observing molten resin flowed in a molten resins flow path 15 is provided on a molten resin transfer tubular body 3 with the molten resin flow path 15. The observation window 7 is constituted of a glass inserting hole 8 formed on the molten resin transfer tubular body 3 in communication with the molten resin flow path 15, a glass 11 inserted into a glass inserting hole 8 and a glass end face peripheral edge presser 12 so disposed as to press the peripheral edge of an outwardly facing end face 11f of the glass 11 through a packing 10 and fixed on the molten resin transfer tubular body 3. The glass inserting hole 8 is so provided as to communicate the molten resin transfer tubular body 3 with the molten resin flow path 15 and open straight on the molten resin flow path 15. The glass 11 is inserted into the glass inserting hole 8 without supporting its inwardly facing end face 11e by a member on the molten resin transfer tubular body 3.