Abstract:
An apparatus and method for extruding a thin uniform coating of fluent plastic material about a continuously advancing strand wherein the fluent plastic material is directed radially toward the strand through a constricted annular feed passage. The strand with the fluent plastic material adhering thereto is then advanced through a passageway conically converging to an exit end and effective to develop hydrodynamic pressure forces which center the strand within the passageway.
Abstract:
An apparatus for producing a foamed thermoplastic resin comprising an extruder including a barrel through which a thermoplastic resin is fed while being melted and a head to extrude said molten resin from said barrel, and gas injector means to inject a gas into said molten resin in said barrel through a gas injecting port in said barrel whereby said foamed thermoplastic resin article is formed by extruding said gas containing molten resin, said gas injector means characterized by comprising a gas metering means or gas flow rate setting means disposed adjacent and connected to said gas injecting port to conduct said gas therethrough while a constant flow rate is maintained, and a volume of a gas passage from said gas flow rate setting means to said gas injecting port in said barrel being sufficiently set for the gas pressure in said gas passage to respond to variation in the pressure of said molten resin in said barrel.
Abstract:
The operation of an extrusion machine is controlled to obtain a constant cross section in the extrudate without the need to make measurements upon it. The machine is fed by a controlled feeding device which discharges into a reservoir that has a capacity sufficient to ensure that the machine is choke fed, and the reservoir is provided with means, such as a narrow neck, to amplify variations in the level so that unacceptable changes are immediately indicated. Signals representing a rate of feed to the reservoir and the line speed are obtained and the relationship between the feed rate and the speed of the machine and between the feed rate and the line speed are adjusted respectively to maintain a constant level in the reservoir and to establish a constant relationship so that the rate of extrusion of material is kept constant.
Abstract:
Calendering installation for the production of a reinforcing ply (600) for a tire, which has a frame (100), two extruders (200, 300) for feeding elastomer material, a reinforcing-thread feeding device (400), a calender (500) having a first pair of counter-rotating rollers, with a first working roller (52) and a first shaping roller (51), and a second pair of counter-rotating rollers, with a second working roller (53) and a second shaping roller (54), wherein a calendering nip (59) is formed between the working rolls (52, 53) in order to receive a first calendered rubber ply (57) delivered by the first pair of rollers (51, 52), a second calendered rubber ply (58) delivered by the second pair of rollers (53, 54), and the reinforcing threads (45) in order to supply the calendered reinforcing ply (600), which is conveyed to the outlet of the installation via guide rollers (62, 63).According to the invention, the two extruders (200, 300) are superposed and arranged on either side of a horizontal plane P extending at the level of the guide rollers (62, 63).
Abstract:
A weather strip including a bottom wall, a first lateral wall and a second lateral wall and in which an angle between the bottom wall and the first lateral wall is constant and an angle between the bottom wall and the second lateral wall is partially varied in a longitudinal direction is manufactured. The method includes: a first step of pre-forming the angle of the first lateral wall and the angle of the second lateral wall to be constant and equal to or larger than final maximum angles; a second step of regulating a boundary between the bottom wall and the second lateral wall from moving toward the first lateral wall by a regulating member; a third step of partially varying the angle of the second lateral wall by a movable roller; and a fourth step of forming the angle of the first lateral wall by a fine-movable roller.
Abstract:
A cross-head die assembly for use with an extruder is described. The cross-head die assembly includes: an inlet section having an inlet for communicating flow from the extruder to one or more flow channels formed in a support block; and an outlet, a removably mounted die located at the outlet and in fluid communication with the one or more flow channels; said support block further comprising an interior slot extending from a first side of the support block to an outlet passageway; a removable cassette positioned in the interior slot, wherein the front end of the removable cassette is positioned to seal the outlet passageway of the slot so that the slot is isolated from the flow.
Abstract:
This disclosure relates generally to corrugated pipe, and more particularly to corrugated pipe with an outer wrap. In one embodiment, a pipe includes an axially extended bore defined by a corrugated outer wall having axially adjacent, outwardly-extending corrugation crests, separated by corrugation valleys. The pipe also includes an outer wrap applied to the outer wall. The outer wrap may include fibers and plastic. The outer wrap may span the corrugation crests producing a smooth outer surface.
Abstract:
An assembly and process for forming a two stage extrusion of an elongated marine dock from a plasticized material, such as including but act limited to extruding a first generally “L” shaped bracket from a first more rigid thermoplastic, following which a cross head die arrangement is utilized in order to extrude a secondary arcuate and flexible material in extending fashion from a lower side of the “L” bracket. The secondary/flexible elastomer is extracted in an open flexed position relative to the first extruded bracket, and further such that, following completion, can be flexed into a closed engagement with an upper perpendicularly extending side of the bracket.
Abstract:
A cross-head die assembly for use with an extruder is described. The cross-head die assembly includes: an inlet section having an inlet for communicating flow from the extruder to one or more flow channels formed in a support block; and an outlet, a removably mounted die located at the outlet and in fluid communication with the one or more flow channels; said support block further comprising an interior slot extending from a first side of the support block to an outlet passageway; a removable cassette positioned in the interior slot, wherein the front end of the removable cassette is positioned to seal the outlet passageway of the slot so that the slot is isolated from the flow.
Abstract:
An upstream/downstream process for making map pocket stiffeners formed of extruded material and a wire. The extrusion is drawn through a die of a main extruder forming a main body with a channel and the extrudate is then pulled through a first cooling tank to cool the extrudate and set the profile. The wire is automatically indexed into the channel by a programmable indexing device for proper location and distance between each piece of wire. The extrudate with the wire is re-heated and then pulled through a secondary extruder to encapsulate and seal the wire within the extruded material. The extrudate is cooled in a second cooling tank and passes through a series of rollers to achieve a predetermined shape before being cut and profiled to predetermined lengths and dimensions.