Abstract:
An extrusion die for extruding biodegradable material, the extrusion die comprising: a mandrel (30); an outer member (40) positioned near the mandrel; an extrusion orifice (5) between the mandrel and the outer member; a member in communication with at least one defining member of the extrusion orifice, wherein the member is capable of producing relative movement between the outer member and the mandrel, wherein the relative movement has a component transverse to an extrusion direction of biodegradable material through the extrusion orifice; a flow control device which controls flow of biodegradable material through the extrusion die; and a positioning device which positions the outer member and the mandrel relative to each other. An improved process for the extrusion of biodegradable material wherein the extrusion comprises flowing the biodegradable material in a flow direction through an orifice, the improvement comprising: moving the biodegradable material in a direction having a component transverse to the flow direction during extrusion; controlling the flow rate of biodegradable material through the extrusion die during extrusion, wherein the controlling comprises adjusting the head pressure of the biodegradable material in the extrusion die and adjusting at least one cross-sectional area of a biodegradable material flow path within the extrusion die; and modifying the orifice geometry.
Abstract:
A process and apparatus for manufacturing integrally and readily resin moldings having a portion where holes of small diameters are arranged in a mesh like pattern and having no planar burrs. A process for press-molding molten resin by supplying the molten resin into a cavity between a pair of a fixed mold (11) and a movable mold (13) and closing the cavity by the movable mold, comprising interposing a plurality of small diameter columnar members (22) arranged at regular intervals between a core member (24) formed in part of the fixed mold protrusibly toward the movable mold, supplying molten resin into the cavity (19) formed between the fixed mold and the movable mold, closing the cavity by the movable mold, and press molding the molten resin while moving back the core member by the pressure thereby to produce a resin molding having a portion where holes of small diameters are arranged in a mesh.
Abstract:
A system for directing a composite pipe (11) around an obstruction (21) during formation of the pipe, wherein: a passageway (23) is formed to one side of and beyond the obstruction (21), the composite (pipe 11) is sealed part way along its length with a first sealing means (12) prior to reaching the obstruction (21) so as to leave a sealed section (15) of pipe (11) prior to the obstruction (21) and a length of flexible sock (13) with an end (14); and wherein the length of flexible sock (13) is adapted to pass under and beyond the obstruction (21); and wherein a pulling means (25) is connected to the end (14) of the flexible sock (13) and passed along the passageway (23) beyond the obstruction (21); and wherein the pulling means (27) pulls the flexible sock (13) along the passageway (23) beyond the obstruction (21) so that further formation of the pipe (11) may be continued from the end (14).
Abstract translation:一种用于在形成所述管道期间将复合管(11)引导到障碍物(21)周围的系统,其中:在所述障碍物(21)的一侧并超过所述障碍物(21)形成通道(23) 在到达阻塞物(21)之前,复合物(管11)沿着其长度用第一密封装置(12)部分地密封,从而在阻塞物之前留下管(11)的密封区段(15) 21)和一段具有端部(14)的柔性短袜(13); 并且其中所述柔性袜子(13)的长度适于在所述障碍物(21)之下并超过所述障碍物(21); 并且其中牵引装置(25)连接到所述柔性袜(13)的所述端部(14)并且沿着所述通道(23)穿过所述障碍物(21);并且其中, 并且其中所述拉动装置(27)沿着所述通道(23)拉动所述柔性袜子(13)越过所述阻塞物(21),从而可以从所述端部(14)继续进一步形成所述管道(11)。 p >