초록 ▼

There has been provided a delivery system for conditioning molten thermo-plastic material, wherein a first pipe member, having an inlet at one end adapted to receive the material and an outlet at an opposite end for delivering the material therefrom at a desired homogeneity is coupled at its inlet e

There has been provided a delivery system for conditioning molten thermo-plastic material, wherein a first pipe member, having an inlet at one end adapted to receive the material and an outlet at an opposite end for delivering the material therefrom at a desired homogeneity is coupled at its inlet end to a furnace. An insulated shell structure, having at least one fluid inlet and outlet therein, is located concentrically about the first pipe member and defines a closed insulated space thereabout. The shell is adapted to receive heat exchange fluid for circulation from the inlet to the outlet in said closed space for removing heat from the thermo-plastic material flowing through the pipe member. Means is provided for shielding inside surfaces of space between the shell and the pipe member from deleterious ambient including a purge fluid which may act alone as the heat exchange fluid.

대표청구항 ▼

A furnace delivery apparatus for conditioning molten thermo-plastic material leaving the furnace at a relatively high temperature comprising: a pipe having inlet adapted to receive the material at one end and an outlet for delivering said material at a desired homogeneity therefrom, the pipe becomin

A furnace delivery apparatus for conditioning molten thermo-plastic material leaving the furnace at a relatively high temperature comprising: a pipe having inlet adapted to receive the material at one end and an outlet for delivering said material at a desired homogeneity therefrom, the pipe becoming heated to near the high temperature by contact with the thermoplastic material; a shell having at least one fluid inlet and an outlet, the shell located concentrically about said pipe and defining a closed annular space thereabout for receiving a heat exchange fluid and a purge fluid therein, the purge fluid being inert relative to the pipe, said shell having inlets and outlets for at least one pass circulation of the heat exchange fluid and the purge fluid in at least a portion of the annular space adjacent the pipe for respectively removing sensible heat from the material passing through said pipe and for driving out deleterious ambient atmosphere from the annular space, and thereby shielding the pipe while near the relatively high heat from the deleterious ambient; and an insulating structure located about said annular space for minimizing heat loss therefrom. A method of delivering molten thermoplastic material, leaving a furnace at a relatively high temperature through a channel member having an insulating layer spaced exteriorly of the channel member leaving an annular space thereabout, comprising the steps of: conducting said thermoplastic material through the channel member, which channel member becomes heated to near the high temperature by the thermoplastic material in contact therewith; shielding said channel member, while at the elevated temperature, from deleterious ambient atmosphere by supplying a purge fluid into the annular space to be in contact with an exterior of the channel member, and thereby blocking ambient atmosphere from coming into contact with the channel member while it is near the high temperature; choosing the purge fluid to be inert relative to the channel member; and removing heat from said thermo-plastic material by heat exchange with the channel member to a working fluid into and out of portions of said annular space, whereby the thermo-plastic material entering the channel member passes therethrough and is delivered from an outlet end thereof in a desired condition.