Melt spinning apparatus

Claim 2

A melt spinning assembly for the manufacture of threads from one or more synthetic polymers, comprising: a. a spinneret plate having rectangular sides, said plate having multiple orifices for extruding polymers into threads and sloping guide surfaces; b. hood means having corresponding rectangular sides adjacent and above the spinneret plate, said hood means forming a cavity over the spinneret plate to supply one or more polymers to said spinneret plate and having sloping guide surfaces forming a male dovetail guide in conjunction with the spinneret plate guide surfaces; c. sideplates having female dovetail slots loosely corresponding to the combined hood means and spinneret plate male dovetail guide; d. separating means for forcing said hood guide means and spinneret plate apart; and e. sealing means for preventing loss of polymer from the cavity formed by said hood means and spinneret plate.

Claim 3

The melt spinning assembly of claim 1, wherein said separating means comprises adjustable screws mounted in the hood means.

Claim 4

The melt spinning assembly of claim 1 wherein the total vertical clearance between the male and female guide surfaces is greater than 0.3 mm but less than 1.5 mm.

Claim 5

The melt spinning assembly of claim 1 wherein said sealing means comprise: a. at least one groove around the periphery of the cavity formed by the hood means and spinneret plate, said groove being approximately centered along the boundary surface of said hood means and spinneret plate, and b. a continuous band-shaped sealing ring mountable in said groove.

Claim 6

The melt spinning assembly of claim 4 wherein the boundary surface of said hood means and spinneret plate is exposed to atmospheric pressure during operation.

Claim 7

The melt spinning assembly of claim 4 wherein the side walls of said groove are sloped at an angle of 2* - 3* from the vertical toward said boundary surface.

Claim 8

The melt spinning assembly of claim 5 wherein the width of the slit formed by the boundary surface is smaller than twice the thickness of the sealing ring before the latter is subjected to deformation.

Claim 9

The melt spinning assembly of claim 4 wherein said groove is formed by the sidewalls of said cavity.

Claim 10

The melt spinning assembly of claim 4 wherein the height of said sealing ring is less than the height of said groove.

Claim 11

The melt spinning assembly of claim 5 wherein the height of said sealing ring is approximately 1 mm less than the height of said groove.

Claim 12

A melt spinning assembly for the manufacture of threads from one or more synthetic polymers, comprising: a. a spinneret plate having rectangular sides, said plate having multiple orifices for extruding polymers into threads; b. hood means having corresponding rectangular sides adjacent and above the spinneret plate for supplying one or more polymers to the spinneret plate, said hood means forming a cavity over the spinneret plate to supply polmer to each spinneret orifice; c. sloping guide surfaces formed on the sides of said spinneret plate and adjacent hood means, said guide surfaces conjunctively forming a male dovetail guide; d. side plates in which are formed female dovetail slots loosely corresponding to the combined hood means and spinneret plate male dovetail guide; and e. a continuous band-shaped sealing ring mountable in the cavity formed between said hood means and said spinneret plate.

Claim 13

A melt spinning assembly for the manufacture of threads from one or more synthetic polymers, comprising: a. a spinneret plate having rectangular sides, said plate having multiple orifices for extruding polymers into threads; b. hood means having corresponding rectangular sides adjacent and above the spinneret plate for supplying one or more polymers to the spinneret plate, said hood means forming a cavity over the spinneret plate to supply polmer to each spinneret orifice; c. sloping guide surfaces formed on the sides of said spinneret plate and adjacent hood means, said guide surfaces conjunctively forming a male dovetail guide; d. side plates in which are formed female dovetail slots loosely corresponding to the combined hood means and spinneret plate male dovetail guide; and e. a continuous band-shaped sealing ring mountable in the cavity formed between said hood means and said spinneret plate.