| 摘要 |
PURPOSE:To adhere a mold release agent to an inner circumferential surface of a crude rubber hose evenly, by a method wherein at the time of extrusion molding of the rubber hose, a mold release agent is exuded through a circumferential surface of a center die in an extruding head. CONSTITUTION:A center die 13 is ejected through an orifice part 19 in an extruding direction of a material and a porous part 21 is formed on the extreme tip. A feed hole 23 for a mold release agent penetrated continuously through the center die 13, torpedo 11, connecting plate 17, die holder 9 and head annular body 7 is communicated with the porous part 21. A rubber material to be sent from a cylinder part 3 of an extruding machine arrives at an orifice part 19 by passing through a flow path 6 of an extruding head 1, and crude rubber hoses 30 are formed continuously. On the one hand, in this instance, the mold release agent is fed into the feed hole 23 by operating a pump 28. Then the mold release agent is exuded through the porous part 21 and applied continuously to an inner circumferential surface of the crude rubber hose 30. |
