US3248772A - Process for stretching synthetic threads - Google Patents
Process for stretching synthetic threads Download PDFInfo
- Publication number
- US3248772A US3248772A US351540A US35154064A US3248772A US 3248772 A US3248772 A US 3248772A US 351540 A US351540 A US 351540A US 35154064 A US35154064 A US 35154064A US 3248772 A US3248772 A US 3248772A
- Authority
- US
- United States
- Prior art keywords
- thread
- stretching
- threads
- roller
- draw
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title claims description 26
- 238000010438 heat treatment Methods 0.000 claims description 21
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 12
- 229910052742 iron Inorganic materials 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 229920002292 Nylon 6 Polymers 0.000 description 1
- 229920002302 Nylon 6,6 Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 235000000396 iron Nutrition 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02J—FINISHING OR DRESSING OF FILAMENTS, YARNS, THREADS, CORDS, ROPES OR THE LIKE
- D02J1/00—Modifying the structure or properties resulting from a particular structure; Modifying, retaining, or restoring the physical form or cross-sectional shape, e.g. by use of dies or squeeze rollers
- D02J1/22—Stretching or tensioning, shrinking or relaxing, e.g. by use of overfeed and underfeed apparatus, or preventing stretch
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S264/00—Plastic and nonmetallic article shaping or treating: processes
- Y10S264/73—Processes of stretching
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
Description
United States Patent 8 Claims. in. 2s 72 This invention relates to a process for stretching synthetic threads while they are in a heated condition.
It is well known that the tearing strength and other physical properties of fully synthetic threads, which have been spun from a solution or melt, can be considerably improved by a stretching process. In such a stretching process, the threads are extended or stretched, while at a temperature below their melting point in order to provide permanently lengthened'threads; in the stretching process, there is an orientation of the macromolecules of the thread in the direction of stretching. Since heated threads can generally be stretched more easily and to a greater extent than when they are in the unheated condition, the threads are conventionally conducted across heated surfaces for causing the heating thereof; the heated surfaces are located between the driven input and draw-off stretching rollers, which are driven at different circumferential speeds, means being provided for clamping the threads. A stationary heated strip of metal is conventionally used to form the heating surface, over which the threads slide.
Such hot stretching processes are particularly important in the production of threads for certain technological uses, as for tire cording, since these threads require a high tear strength. Although it is important that a thread be provided with as high a tear strength as possible, it is also highly desirable that the capillary breakage of the threads be reduced.
It is therefore an important object of this invention to provide an improved process for greatly improving the physical properties, and particularly the tear strength, of synthetic threads.
It is also an object of this invention to provide a process for stretching synthetic threads wherein the tear strength of the thread is greatly improved while substantially reducing the capillary breakage of the threads.
It is a further object of this invention to provide a process for stretching synthetic threads, while they are in a heated condition, so that the thread has greatly increased tear strength and reduced capillary breakage.
Further purposes and objects of this invention will appear as the specification proceeds.
Generally, our improved process for stretching synthetic threads, while in a heated condition, includes the steps of passing the thread over a heated surface, drawing the thread from the heated surface at a rate of about 140-280 meters/minute, and substantially freely moving the thread through space for a period of at least about 0.065 second, and preferably for about 0.09-0.30 second; after the lapse of this period of time, the thread passes over the draw-off roller.
This is highly suitable both for stretching of unstretched threads and for the further streching of prestretched threads. It is particularly advantageous to first prestretch the thread by passing it over an unheated element, as a brake prong, thereafter passing the thread over a heated surface, such as a flat iron, and then for a period of time of at least about 0.065 second, freely moving the thread through space before it touches the draw-off roller.
Flat irons being resistance heated have been found to be particularly satisfactory as a heating medium. Stationary heated, brake prongs or brake rollers, however,
it:IIII.IIIIIIIIIIIIII are also suitable. The heating of the thread may also be accomplished by various types of heating elements which engage the thread in succession, preferably in an alternating arrangement, whereby the thread is heated from several sides.
In case the time of free movement is such that the thread must pass through a distance which is difficult for a machine to accommodate, the thread, after leaving the heated surface, may be passed over one or more deflection rollers before it touches the draw-off roller, without seriously affecting the advantages of the process.
Our process has provided excellent results with all known fully synthetic fibers, and particularly good results have been accomplished with polyamide threads. By utilizing our process, it is possible not only to considerably increase the tearing strength with equivalent and even increased tearing extension, but also the quantity of capillary breakage of thread is considerably decreased.
The following examples more fully illustrate the invention, but it is to be understood that the various procedural details included therein are not to be considered as a limitation of the scope of the invention, rather it is intended that all equivalents obvious to those skilled in the art are to be included within the scope of the invention as claimed.
Example I An unstretched, multifile nylon6 thread (Td 4500/ was introduced into a stretching field over an input roller, provided with a contact pressure roller. After a 360 encircling of a brake prong of 10 mm. diameter, it then passed over a 200 mm. long flat iron and was finally drawn oli at 52-fold 180 m./min. speed by a second roller, provided with a distributor roller. The flat iron was at a temperature of 180 C. The running time for the thread from the flat iron to the draw-off roller was 0.15 sec., which corresponds to a running distance of 450 mm.
A comparative experiment was run with a running time of 0.02 sec., corresponding to a distance of 60 mm. The following table compares the results:
TABLE I Running Tearing time strength (EL/den.)
Tearing extension (percent) Capillary breakage number (per 20 km.)
Path (mm) tom Example II For the production of a nylon-66 thread for technical uses, an unstretched thread was first conducted over an input roller, having a distributor roller which served as a clamping point. It was then conducted over a flat iron at a temperature of C. and was drawn off by a second roller at a draw-off velocity of 150 m./min. The running time of the thread from the fiat iron to the drawoff roller was 0.5 sec., which corresponds to a distance of 1250 mm. The stretching ratio caused by the differing circumferential velocity of the rollers was 1:5.4.
A comparative experiment was run with a running time of 0.036, corresponding to a distance of 90 mm. The results are shown in the following table:
TAB LE II Path Running time (sec.)
Tearing strength (g. lden.)
Tearing extension (percent) What we claim and desire to secure by Letters Patent is:
1. A process for stretching synthetic threads between input and draw-off stretching rollers, wherein a heating means is interposed between the stretching rollers, said process comprising the steps of drawing the synthetic thread from the heating means at a rate of about 140-280 meters/minute, and substantially freely moving said thread for at least about 0.065 second before said thread reaches the draw-01f roller.
2. Theprocess of claim 1 wherein said thread is sub-- stantially freely moved for about 0.090.30 second.
3. The process of claim 2 wherein said thread is prestretched before passage to the heating means.
4. A process for stretching synthetic threads, said process comprising the steps of heating said thread, and then substantially freely moving said thread at a speed of about 140-280 meters/minute for at least about 0.065 second, while stretching said thread.
5. The process of claim 4 wherein said thread is prestretched before said heating step and is substantially freely moved for about 0.090.30 second.
6. A process for stretching synthetic threads between input and draw-off stretching rollers wherein a heating means is interposed between the stretching rollers, said process comprising the steps of passing said thread across said heating means to effect heating of said thread, drawing said thread from said heating means at a rate of about 180 meters per minute, and substantially freely moving said thread for about 0.15 second while stretching said thread before said thread reaches the draw-off roller.
7. The process of claim 6 wherein said thread is prestretched before being subjected to the heating step.
8. A process for stretching synthetic thread between input and draw-off stretching rollers wherein a heating means is interposed between the stretching rollers, said process comprising the steps of passing the thread across the heating means to effect the heating thereof, drawing the thread from the heating means at a rate of about meters per minute, and substantially freely moving saidthread for about 0.5 second while stretching said thread before said thread reaches the draw-off roller.
References Cited by the Examiner UNITED STATES PATENTS 2,509,741 5/1950 Miles 2871.3 X 2,993,260 7/1961 Boerma et al. 2871.3X 3,101,990 8/1963 Heighten 28-713 X 3,124,632 3/1964 Larkin et al. 28-71.3 X 3,159,964 12/1964 Kretsch 2871.3 X
DONALD 'W. PARKER, Primary Examiner.
L. K. RIMRODT, Assistant Examiner.
Claims (1)
1. A PROCESS FOR STRETCHING SYNTHETIC THREADS BETWEEN INPUT AND DRAW-OFF STRETCHING ROLLERS, WHEREIN A HEATING MEANS IS INTERPOSED BETWEEN THE STRETCHING ROLLERS, SAID PROCESS COMPRISING THE STEPS OF DRAWING THE SYNTHETIC THREAD FROM THE HEATING MEANS AT A RATE OF ABOUT 140-280 METERS/MINUTE, AND SUBSTANTIALLY FREELY MOVING SAID THREAD FOR AT LEAST ABOUT 0.065 SECOND BEFORE SAID THREAD REACHES THE DRAW-OFF ROLLER.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEZ0010049 | 1963-04-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3248772A true US3248772A (en) | 1966-05-03 |
Family
ID=7621178
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US351540A Expired - Lifetime US3248772A (en) | 1963-04-11 | 1964-03-12 | Process for stretching synthetic threads |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US3248772A (en) |
| CA (1) | CA722855A (en) |
| DE (1) | DE1435743A1 (en) |
| GB (1) | GB993615A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3472016A (en) * | 1966-07-11 | 1969-10-14 | American Enka Corp | Synthetic yarns,fabrics and processes for making the same |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2509741A (en) * | 1942-11-03 | 1950-05-30 | Du Pont | Production of filamentous structures |
| US2993260A (en) * | 1958-02-20 | 1961-07-25 | American Enka Corp | Differentially heated draw pin |
| US3101990A (en) * | 1960-10-13 | 1963-08-27 | Du Pont | Process of drawing filamentary structures |
| US3124632A (en) * | 1961-04-10 | 1964-03-10 | Phocess for treating nylon | |
| US3159964A (en) * | 1960-01-12 | 1964-12-08 | Hoechst Ag | Process for working up stretched filaments of aromatic polyesters of high molecular weight |
-
0
- CA CA722855A patent/CA722855A/en not_active Expired
-
1963
- 1963-04-11 DE DE19631435743 patent/DE1435743A1/de active Pending
-
1964
- 1964-03-12 US US351540A patent/US3248772A/en not_active Expired - Lifetime
- 1964-04-08 GB GB14595/64A patent/GB993615A/en not_active Expired
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2509741A (en) * | 1942-11-03 | 1950-05-30 | Du Pont | Production of filamentous structures |
| US2993260A (en) * | 1958-02-20 | 1961-07-25 | American Enka Corp | Differentially heated draw pin |
| US3159964A (en) * | 1960-01-12 | 1964-12-08 | Hoechst Ag | Process for working up stretched filaments of aromatic polyesters of high molecular weight |
| US3101990A (en) * | 1960-10-13 | 1963-08-27 | Du Pont | Process of drawing filamentary structures |
| US3124632A (en) * | 1961-04-10 | 1964-03-10 | Phocess for treating nylon |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3472016A (en) * | 1966-07-11 | 1969-10-14 | American Enka Corp | Synthetic yarns,fabrics and processes for making the same |
Also Published As
| Publication number | Publication date |
|---|---|
| DE1435743A1 (en) | 1969-09-04 |
| GB993615A (en) | 1965-06-02 |
| CA722855A (en) | 1965-12-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US2289232A (en) | Method and apparatus for producing filamentary structures | |
| US2296394A (en) | Manufacture of novelty artificial yarn | |
| US2974391A (en) | Process and apparatus for making crimped filaments | |
| US2346208A (en) | Treatment of high tenacity yarn of synthetic origin | |
| GB695567A (en) | Super-stretching polyester filaments, yarns, films, and similar structures | |
| WO1994011550A1 (en) | Method and apparatus for producing polyester fiber | |
| US3388030A (en) | Twistless synthetic multifilament yarns and process for making the same | |
| US3165881A (en) | Production of high bulk yarns | |
| US2942325A (en) | Process of treating undrawn polyester yarns and filaments | |
| US4113821A (en) | Process for preparing high strength polyamide and polyester filamentary yarn | |
| US3248772A (en) | Process for stretching synthetic threads | |
| US3030173A (en) | Process for the uniform preparation of shaped structures such as filaments or foils from high-melting linear polyesters | |
| KR840001652A (en) | Polyamide fiber having excellent strength and manufacturing method thereof | |
| US3275732A (en) | Process for preparing thick and thin novelty yarns | |
| US3910027A (en) | Process for the simultaneous stretch texturing of filament yarn | |
| US3112551A (en) | Process for the manufacture of crimped filament yarns | |
| US2332485A (en) | Vinylidene chloride fibers | |
| US3837156A (en) | Process for producing molecularly oriented, textured continuous filaments | |
| JPS583049B2 (en) | Manufacturing method of polyester yarn | |
| US3379809A (en) | Process for drawing and crimping yarn | |
| US3651201A (en) | High-elongation-and-tenacity nylon tire yarn | |
| GB777625A (en) | Process for the manufacture of improved yarns | |
| US2976578A (en) | Method and apparatus for treating acrylic fibers | |
| GB1037997A (en) | Drawing synthetic filaments | |
| US3527045A (en) | Production of yarns |