EP0547704A1

EP0547704A1 - Improvement in the block incorporating a series of spinning heads, for their uniform heating

Info

Publication number: EP0547704A1
Application number: EP92203910A
Authority: EP
Inventors: Paolo Prodi; Daniele Pasotti; Mauro Pini
Original assignee: Savio SpA; Savio Macchine Tessili SpA
Current assignee: Savio SpA; Savio Macchine Tessili SpA
Priority date: 1991-12-19
Filing date: 1992-12-12
Publication date: 1993-06-23
Also published as: CN1078273A; ITMI913419A1; MX9207433A; IT1252555B; ZA929783B; ITMI913419A0; KR930013228A

Abstract

This invention provides an improvement in the block incorporating a series of spinning heads for spinning plastic masses to obtain synthetic yarn, and specifically relates to a block with the spinning heads, one following another, spaced equally and sufficiently apart to generate a perfect distribution of the heating vapour about each individual spinning head, which is hence heated to a strictly uniform temperature in each of its parts, this temperature being precisely the same for each of the spinning heads incorporated into the spinning block.

Description

The present invention relates to an improvement in the block incorporating a series of spinning heads for spinning thermoplastic masses to obtain synthetic yarn.
More specifically, the invention consists of spacing the spinning heads equally and sufficiently apart to achieve perfect distribution of the diphenyl heating fluid about each individual spinning head.
It has been long known to produce continuous yarn from synthetic polymers by the melt spinning method. With this method the starting polymer in the solid state passes initially through a heating process in which it is melted to the liquid state, after which it is fed to the actual spinning heads.
These spinning heads comprise a heating system using diphenyl or similar vapour originating from a common vapour generator with a directly connected piping system for distributing the vapour. In known constructions, the individual spinning heads are arranged in rectangular blocks, in which case they lie one against another and the heat from the diphenyl vapour is transferred from one head to another by thermal conductivity. Arrangements of this kind have long been known in synthetic yarn production. This known spinning head arrangement presents various problems. One of these is that to obtain as uniform a heat transfer as possible from one head to another, all the spinning heads oust be lapped by the diphenyl heating vapour in an identical manner. This requirement is not totally satisfied in the current state of the art. This means that perfect temperature uniformity between one head and another and between the various parts of the same spinning head is not achieved.
Deriving from this state of the art, the object of the invention is to improve the block incorporating a series of spinning heads such that during the operation of the plant all the parts have precisely the same temperature.
According to the present invention this object is attained in that the spinning block is formed from several spinning heads one following another, which are equally and sufficiently spaced apart to generate a perfect distribution of the diphenyl heating vapour about each individual spinning head, which is hence heated to a strictly uniform temperature in each of its parts, this temperature being precisely the same for each of the spinning heads, which are positioned one following another and combined into a single block.
The present invention will be more apparent from the accompanying drawings, which show one embodiment of the improvement in the block incorporating a series of spinning heads, for their perfectly uniform heating.
Figure 1 is an axonometric schematic view of two blocks incorporating a series of spinning heads in advantageously aligned arrangement.
Figure 2 is a schematic cross-section through the block incorporating a series of spinning heads.
Those parts not necessary to the invention are omitted from the figures for reasons of overall clarity, in that they are already known and are not applicable to an understanding of the present invention. The pump 11, driven by the drive shaft 4, compresses the molten polymer mass and distributes it through the ducts 14 to the individual spinning heads 3.
The molten polymer mass feeding the pump 11 originates from the direction 6. The diphenyl vapour, or similar heating fluid, originating from a vapour generator (not shown), is fed through the pipes 1 in the direction of the arrows 2. Said heating fluid is then distributed, in the direction of the arrows 7, about the individual spinning heads 3, which are sufficiently spaced apart by a distance 16. This distance 16 is strictly constant from one head to another, said heads 3 being fixed to the support plate 5 to form a single piece.
The diphenyl vapour, used as heating fluid, leaves the block through the apertures 10 in the direction 12 to return to the vapour generator, as is well known to the expert of the art. That part of the heating fluid which condenses leaves from the bottom of the block through the pipes 8 and 18 in the direction 9. The block, representing an assembly of several spinning heads 3, is fixed to the plant structure by brackets 15.
The description is given by way of example only, it being apparent that modifications in terms of detail can be made to the block incorporating a series of spinning heads according to the present invention, but without leaving the scope of the inventive idea as claimed hereinafter.

Claims

A block incorporating a series of spinning heads for spinning plastic masses to obtain yarn or similar filiform product from molten thermoplastic material, there terminating at said block a ducting system for the distribution of the molten thermoplastic mass, about said block there being provided a heating system using diphenyl vapour, or a similar heating fluid, originating from a common vapour generator with a vapour distribution piping system directly connected to said block, and a return system for the recirculation of the exit fluid and its condensate, said block being characterised in that the spinning heads, one following another, are equally and sufficiently spaced apart to generate a perfect distribution of the heating vapour about each individual spinning head, which is hence heated to a strictly uniform temperature in each of its parts, this temperature being precisely the same for each of the spinning heads, which are positioned one following another and combined into a single block.