US3864074A

US3864074A - Yarn Heater

Info

Publication number: US3864074A
Application number: US437354A
Authority: US
Inventors: Samuel Gosling
Original assignee: Ernest Scragg and Sons Ltd
Current assignee: Ernest Scragg and Sons Ltd
Priority date: 1973-01-27
Filing date: 1974-01-28
Publication date: 1975-02-04
Anticipated expiration: 1992-02-04
Also published as: IT1007097B; CA980559A; JPS49108355A; FR2215496A1; CH563474A5; GB1394934A; DE2403731A1; FR2215496B3

Abstract

A yarn heater assembly is provided or formed with an endwise extension of that part of the assembly which constitutes a heating zone for a running yarn. The extension houses a box-like suction chamber having a lengthwise inlet or inlets for entraining and removing fumes and condensate from the heated yarn.

Description

[451 Feb. 4, 1975 3,782,890 l/l974 Howorth 432/59 3,796,538 3/l974 432/59 l l YARN HEATER Howorth...............................

[75] Inventor: Samuel Gosling, Bollington nr.

Macclesfield, England [73] Assignee: Scrogg Ernest & Sons Limited. Primary E i j Camby Macclesfield, England Attorney, Agent, or Firm-Michael S. Striker Jan. 28, 1974 Appl. No.: 437,354

[22] Filed:

ABSTRACT [30] Foreign Application Priority Data Jan. 27, 1973 Great Britain....................

References Cited UNITED STATES PATENTS [52] US. 432/59, 266/3, 432/72 {51] Int.

[58] Field of Search..........

1,746,155 Heisler.............................i... 432/59 7 Claims, 3 Drawing Figures 4 5 a l 6 we. 2 W J a z w I n" n 2 a. I 3 r 2 e x x 0% ns mo r i /lvi z u a 9 5 2 n lllll ||ll1|l1l||1|l|||||||llllllllllllllL YARN HEATER This invention relates to a heater for processing running yarns, and especially to heaters used on machines for producing false twist crimped thermoplastic yarns which during processing are heated whilst in a highly twisted condition to set the twist.

It is known that fumes are given off by thermoplastic polymeric yarns when they are heated to temperatures such as are required to set twist, and it is already known to employ fume extraction equipment to deal with removal of these fumes and/orcondensate formed from the fumes.

According to the present invention a yarn heater assembly is provided with or formed with an endwise extension of that part of the heater assembly which provides a heating zone for a running yarn or yarns, said endwise extension forming a housing for fume removal means which are thereby incorporated as part of the heater assembly.

The endwise extension may be formed to provide an open-sided lengthwise recess which houses a coextensive box-like suction chamber along the length of which the running yarn or yarns travels adjacent one wall of the chamber, said wall being provided with inlet means through which fumes given off by the yarn are drawn into the suction chamber.

Preferably said inlet means is a slot running lengthwise of the chamber wall. Both ends of a yarn heater assembly may be provided with or formed with an endwise extension each housing fume removal means, or only one endwise extension may be provided at the exit end of the heater assembly as regards the direction of yarn travel.

The tendency is for fumes to rise as they are formed from yarn running over or through a heater, depending upon the type of heater employed, but in present day high speed yarn processing machines heaters of relatively great length are employed, such as one metre or more, because of the speed of travel of the running yarns.

The elongated heaters currently in use are usually located in a processing machine in an upright disposition, or may even be inclined to reduce the overall height of the machine. When yarns run from bottom to top of the machine the tendency of the fumes to rise is assisted by the running yarns and it has been proposed to locate common fume extraction equipment adjacent the tops of the heaters for serving all heaters in a row.

Even when the yarns have run from top to bottom of the machine. the tendency has been for the fumes to rise, but with yarn processing speeds currently being of the high order of 750 metres 21 minute or greater, it has been found that the running yarns cause fumes to issue from the bottom ends of upright or inclined heaters to an extent which necessitates the use of fume removal equipment in order that these high running speeds can be maintained, the present invention being particularly useful in these circumstances for fume removal at the bottom exit ends of heaters.

An embodiment of the invention will now be described with reference to the accompanying diagrammatic drawings, in which:

FIG. 1 is a fragmentary front view of one end portion of a yarn heater assembly according to the invention.

FIG. 1a shows a modification of FIG. 1; and

FIG. 2 is an end view of the heater assembly of FIG. 1.

Referring to the drawings, in FIG. 1 two yarns 10 are indicated as running downwardly through an upright heater assembly indicated generally at A.

The yarns 10 are heated by running in lengthwise grooves 11 of a heater plate 12, and the chain-dot line 13 of FIG. 1 denotes the bottom end of that part of the heater assembly which is actually involved in heating the yarns, the heater plate 12 being located in an opensided channel-like lengthwise recess provided by a casing 14 which in generally well-known manner encloses heating means for the heater plate, such as electrical heating elements with insulation to limit heat loss (not shown), although other methods of heating could be employed.

In accordance with the present invention the casing 14 of the heater assembly is formed with an integral endwise extension 15 which has the same contours as the main casing 14 and which could be a separately formed part secured to the main casing instead of being integral therewith. The endwise extension 15 forms a housing for fume removal means which is thereby incorporated as part of the heater assembly, the extension 15 being shaped to the same cross-sectional contour as the main casing 14 to provide an open-sided lengthwise recess 16 through which the yarns 10 travel, the recess housing a co-extensive box-like suction chamber 17 which is secured by its rear wall 18 to the rear wall 19 of the extension.

The suction chamber 17 is conveniently made from sheet metal by fabrication, its rear wall 18 and side walls being formed by bending a first sheet metal strip to channel shape, and its front wall 21 being provided by the base of a second sheet metal strip also bent to channel shape and having its side walls 22 secured as by welding to the inner faces of the side walls 20 of the first channel shape strip. The second bent strip provides an open-ended channel through which the yarns 10 travel from the heater plate 12, but the ends of the suction chamber 17 are otherwise closed, the base of the channel for the yarns 10 being the front wall 21 of the box-like suction chamber thus fabricated.

The two yarns 10 run along the length of the suction chamber adjacent its front wall 21, which is provided with inlet means in the form of a lengthwise slot 23, through which fumes given off by the yarn are drawn into the suction chamber 17. Other inlet means instead of a slot may be used, such as a row of holes or short slots 23a (see FIG. 1a).

The suction chamber 17 is connected to an exhaust pipe 24, preferably near the bottom end of the chamber, which is connected to a source of suction so that fumes and condensate are drawn from the chamber of disposal.

Near the bottom end of the suction chamber 17, its front wall 21 can also be provided with a condensate drain hole 25(FIG. 1), through which is sucked for disposal any condensate which may form on the front wall 21 of the chamber and flow down the front wall. More than one such drain hole can be provided in the front wall 21. The hole 25 seen in FIG. 1 is located on the right hand side of the front wall near its bottom end, and would be so located if the heater assembly shown upright were inclined to the right. Near the drain hole 25 is shown a shallow ledge 26 for trapping any condensate flowing down the front wall 21. There could be further such ledges near further drain holes in the front wall 21.

When heater assemblies such as above described are employed in false twist crimping machines as twist setting heaters, the yarn runs from the heater to a false twister and the twist which is inserted runs back over the heater and is set. The yarn needs to be cooled before it reaches the false twister, and the present invention, besides providing for highly efficient fume removal with minimum escape of fumes into the atmosphere, also gives the advantage that a stream of air at ambient temperature is induced by suction to flow across the running yarn and provide a cooling effect close upon the yarn leaving the heating zone of the heater assembly.

What is claimed is:

1. In a yarn heater assembly comprising means defining an elongate heating zone for at least one running yarn, the improvement comprising an endwise longitudinally projecting extension at one end at least of said assembly, and fume removal means incorporated in said extension.

2. in a yarn heater assembly comprising means defining an elongate heating zone for at least one running yarn, the improvement comprising an endwise longitudinally projecting extension at one end at least of said assembly, said extension being formed to provide an open-sided lengthwise recess, a box-like suction chamber housed in said recess to be co-extensive therewith, a lengthwise front wall of said suction chamber adjacent which the running yarn travels, inlet means in said front wall through which fumes given off by the yarn are drawn into the suction chamber, and means for applying suction to said suction chamber.

3. Yarn heater assembly according to claim 2, wherein said inlet means comprises a lengthwise slot in said chamber front wall.

4. Yarn heater assembly according to claim 2, wherein said inlet means comprises a lengthwise row of holes in said chamber front wall.

5. Yarn heater assembly according to claim 4, wherein said holes are slots in said chamber front wall.

6. Yarn heater assembly according to claim 2, and further comprising at least one condensate drain hole in said chamber front wall.

7. Yarn heater assembly according to claim 2, and further comprising at least one condensate drain hole in said chamber front wall, and at least one condensate trapping ledge adjacent said drain hole.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION PATENT NO. 2 3,864,074

DATED February 4, 1975 INVENTOR(S) Samuel Gosling It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

On the cover sheet, in the heading, the name of the assignee should read Scragg not Scrogg" Signed and Scaled this twenty-ninth Day of July 1975 [SEAL] A ttest:

RUTH C. MASON C. MARSHALL DANN Alresling Officer (ummissiuner uj'Parenrs and Trademarks