EP0607799B1 - Apparatus for heating synthetic yarns - Google Patents

Apparatus for heating synthetic yarns Download PDF

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Publication number
EP0607799B1
EP0607799B1 EP94100099A EP94100099A EP0607799B1 EP 0607799 B1 EP0607799 B1 EP 0607799B1 EP 94100099 A EP94100099 A EP 94100099A EP 94100099 A EP94100099 A EP 94100099A EP 0607799 B1 EP0607799 B1 EP 0607799B1
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EP
European Patent Office
Prior art keywords
heating
yarn
temperature
heating plate
heater
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
Application number
EP94100099A
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German (de)
English (en)
French (fr)
Other versions
EP0607799A1 (en
Inventor
Shunzo C/O Teijin Seiki Co. Ltd. Naito
Hiroshi C/O Teijin Seiki Co. Ltd. Morisaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nabtesco Corp
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Teijin Seiki Co Ltd
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Publication date
Application filed by Teijin Seiki Co Ltd filed Critical Teijin Seiki Co Ltd
Publication of EP0607799A1 publication Critical patent/EP0607799A1/en
Application granted granted Critical
Publication of EP0607799B1 publication Critical patent/EP0607799B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • D02J13/00—Heating or cooling the yarn, thread, cord, rope, or the like, not specific to any one of the processes provided for in this subclass
    • D02J13/001—Heating or cooling the yarn, thread, cord, rope, or the like, not specific to any one of the processes provided for in this subclass in a tube or vessel

Definitions

  • the present invention relates to an apparatus for heating synthetic yarns, particularly an apparatus for heating synthetic yarns to a high temperature, the heat set or heat treating temperature is higher than the melting point of the synthetic yarns, such as polyester, polyamide, for example, higher than 250°C.
  • the present invention is especially suitable as a high temperature heating apparatus of a non-contacting type disposed in a high speed draw texturing machine. Further, the present invention is also applicable for a heating apparatus used in a drawing machine or a heat setting machine.
  • EP-A-O 469 763 describes various contact-type and non-contacting type heating apparatus.
  • a heating apparatus heats such a heating apparatus to a high temperature, i.e., a temperature higher than the melting point of the yarn to be processed, more preferably, to a temperature of at least 400°C, and the yarn is heated in a non-contacting condition.
  • a short but high temperature heater of non-contacting type is used in place of a conventional low temperature heating apparatus of a contacting type.
  • An aluminum alloy may be used for a heater, as long as the heating temperature of the heater is at most 400°C. However, when the heating temperature exceeds 400°C, such an aluminum alloy is not preferred since its melting point is low, and in some cases, such an aluminum alloy cannot be used. In order to overcome such a problem, it may be proposed to use materials having high melting point, such as brass, stainless steel or ceramics, for a material of the heating apparatus which is used at such a high temperature. Further, it may be proposed to use an infrared heater, and to choice far infrared radiation ceramics for a material of the heater or to coat the surface of the infrared heater with ceramics.
  • synthetic yarn is generally applied with finish, i.e., oil, in order to enhance treating conditions.
  • finish i.e., oil
  • the finish may be vaporized and decomposed in the heating apparatus.
  • the heater member may be easily corroded by the thus vaporized and decomposed finish and the high temperature. Accordingly, the material of such a high temperature heater is required to be resistant to such vaporized and decomposed finish and the high temperature.
  • stainless steel is used for a material of a heater member as described above, its thermal conductivity is very low, for example, about 12,6 J/ms°C (0.03 Cal/cm ⁇ s ⁇ °C), while its oxidation resistance and corrosion resistance are high.
  • the distribution of temperature along the length of the heater becomes excessively uneven, that the difference between the temperatures of the heating plate and the heating source for heating the heating plate becomes large, and that the life of the sheath heater becomes short since it is heated to a very high temperature in order to heat the heating plate to a desired temperature.
  • stainless steel has a poor machining capability upon manufacture of a heating apparatus.
  • a heating apparatus for heat setting or heat treating a synthetic yarn continuously running therethrough in a substantially non-contacting condition characterized in that a material of a heating plate of the heating apparatus is a copper alloy, the copper contents of which is at least 60%, and the aluminum content of which is at least 3%.
  • the heating plate of the heating apparatus is made of a copper alloy, the copper content of which is at least 60% and the aluminum content of which is at least 3%, the corrosion problem with respect to the heating plate can be overcome.
  • the thermal conductivity of the heating plate can be high, for example, equal to or more than 41,9 J/ms°C (0.1 Cal/cm ⁇ s ⁇ °C), and the distribution of temperature becomes even.
  • a heating apparatus can be obtained by which false textured yarns with good yarn quality can be manufactured.
  • the copper content of the copper alloy is between 60 and 70%, and the aluminum content of the copper alloy is between 3 and 6%, or that the copper content of the copper alloy is between 85 and 90%, and the aluminum content of the copper alloy is between 8 and 11%, in order to enhance the molding characteristics of such copper alloys.
  • a yarn Y is withdrawn from a supply yarn package 1 by means of first feed rollers 2.
  • the yarn Y is drawn at a predetermined draw ratio between the first feed rollers 2 and second feed rollers 6, and at the same time, twists are imparted to the yarn Y by means of a false twisting device 5, such as a friction belt device, a device with friction discs or a false twisting spindle.
  • a false twisting device 5 such as a friction belt device, a device with friction discs or a false twisting spindle.
  • the false twisting operation may be done subsequent to the drawing operation.
  • Twists imparted to the yarn Y by the false twisting device 5 run back toward the first feed rollers 2 along the yarn Y. Twists run back along the yarn Y are heat set by a heat treating apparatus 3, and the yarn Y is cooled by stabilizing tracks 4a and 4b disposed downstream the heat treating apparatus 3.
  • the yarn Y is imparted with false twists upstream the false twisting device 5 between the first feed rollers 2 and the second feed rollers 6, while it is de-twisted after it leaves the false twisting device 5, and the yarn Y is fed from the second feed rollers 6 to the take-up device 7.
  • the take-up device 7 comprises a traverse device 8 for traversing the yarn Y to and fro, a bobbin holder 10 for mounting a yarn winding bobbin inserted thereon, and a friction roller 9 pressed to the bobbin or yarn layer wound onto the bobbin so as to rotate the bobbin and the bobbin holder 10.
  • the heater body has a total length of between 0.8m and 1.2m, and as illustrated in Fig. 1, in the heat treating apparatus 3 of the present embodiment, the heater body and the heating member which is a sheath heater in this embodiment are divided into two in the lengthwise direction.
  • the heating member may be another known member other than a sheath heater, for example, a plate heater.
  • the heater body comprises the divided heating plates 11 and 21, and sheath heaters 12 and 22 for heating the heating plates 11 and 21 are disposed in the heating plates 11 and 21.
  • Reference numerals 13 and 23 are temperature sensors disposed in the heating plates 11 and 21, respectively.
  • the divided heating members, i.e., the sheath heaters 12 and 22, may be heated to a temperature equal to or higher than 250°C.
  • the condition setting is performed by a control (not shown).
  • the outside of the heating plates 11 and 21 are covered and insulated by insulator 31, and a insulating cover surrounds the outside of them.
  • yarn guides 14 and 24 are disposed within the grooves 11a and 21a spacing a predetermined distance along the yarn running direction.
  • the material of the heating plate of the heating apparatus according to the present invention is a copper alloy, the copper content of which is at least 60%, and the aluminum content of which is at least 3%, so that the thermal conductivity of the heating plate can be high, for example, equal to or more than 41.9 J/ms°C (0.1 Cal/cm ⁇ s ⁇ °C).
  • the copper content of the copper alloy constituting the heating plates is between 60 and 70%, and the aluminum content of the copper alloy is between 3 and 6%, or that the copper content of the copper alloy is between 85 and 90%, and the aluminum content of the copper alloy is between 8 and 11%.
  • the material of the heating plate was a copper alloy, the copper content of which is at least 60%, and the aluminum content of which is at least 3%.
  • the copper content of the copper alloy constituting the heating plates is between 60 and 70%, and the aluminum content of the copper alloy is between 3 and 6%, or when the copper content of the copper alloy is between 85 and 90%, and the aluminum content of the copper alloy is between 8 and 11%, more preferable advantages will be obtained.
  • the heating plates 11 and 21 of the high temperature heating apparatus have the grooves 11a and 21a extending along the running path of the yarn as illustrated in Fig. 1 and forming a yarn passage on the surface thereof as illustrated in Fig. 2, and the heating plates 11 and 21 are heated by the sheath heaters 12 and 22 extending in the heating plates along the yarn passage.
  • the temperatures of the bottom portions of the grooves 11a and 21a where the yarn passes are usually measured by temperature sensors 13 and 23 at the midpoint of the longitudinal direction, i.e., vertical direction in Fig. 1, of the heating plates, and the temperatures of the heating plates are controlled at predetermined temperatures.
  • the set temperatures are so selected that the yarn temperature at the exit of the heater coincides a predetermined temperature, for example, 220 o C.
  • a solid line in Fig. 4 shows distribution of temperature in a lengthwise direction of a heating plate of the high temperature heating apparatus of a non-contacting type according to the present invention, wherein the heating plate is set at a predetermined temperature, for example at 500°C, and the temperatures were measured at bottom portions of a groove where a yarn runs.
  • a broken line designates a result obtained by a heating plate made of brass
  • a-dot-and-a-dash line designates a result obtained by a heating plate made of stainless steel.
  • the present inventors consider that the difference in the distribution of temperature designated by a broken line and obtained by a heating plate of brass and that designated by a-dot-and-a-dash line and obtained by a heating plate of stainless steel was caused by the difference in the thermal conductivities of the materials of the heating plates.
  • the thermal conductivity for stainless steel is 12.6 J/ms°C (0.03 Cal/cm ⁇ s ⁇ °C), in other words, the latter is about 1/10 of the former, and accordingly, when stainless steel is used for the heating plate, the distribution of temperature in the lengthwise direction becomes uneven as illustrated in Fig. 4.
  • all the portions on the heating plates have to be heated to a sufficiently high temperature, for example, a temperature higher than 320°C, preferably, higher than 400°C, so that the adhered yarn is melted and removed in a short time.
  • a sufficiently high temperature for example, a temperature higher than 320°C, preferably, higher than 400°C, so that the adhered yarn is melted and removed in a short time.
  • the set temperature of the heating plate has to be enhanced, and accordingly, increased is the difference between the set temperature of the heating plate and the temperature of the sheath heater, which is the heat source.
  • the set temperature of the heating plate has to be enhanced in order to maintain the yarn temperature at the exit of the heater at a predetermined value, and similarly, increased is the difference between the set temperature of the heating plate and the temperature of the sheath heater, which is the heat source.
  • the sheath heater is heated to an excessively high temperature in order to heat the heating plate to a predetermined temperature, the life of the sheath heater is shortened. Further, when a yarn is passed through a heater, distribution of temperature of which is uneven, there is a concern with regard to adverse influence to the obtained yarn quality. Thus, it is not preferred to adopt stainless steel as the heating plate of the high temperature heater.
  • the heating plate is made of brass, its deterioration is remarkable at high temperature, especially, its corrosion is remarkable when it is heated to a temperature higher than 400°C.
  • the heating plate made of brass cannot be used in a high temperature heater.
  • synthetic yarn is generally applied with finish, i.e., oil, in order to enhance treating condition.
  • finish i.e., oil
  • the finish may be vaporized and decomposed in the heating apparatus.
  • the heater member may be easily corroded by the thus vaporized and decomposed finish and the high temperature. Accordingly, the material of such a high temperature heater is required to be resistant to such vaporized and decomposed finish and the high temperature.
  • the present inventors have taken note of increase of corrosion resistance by addition of aluminum (Al) to copper alloys, and have conducted careful investigation with respect to the abilities, i.e, the thermal conductivity and corrosion resistance against finish, by varying the contents of aluminum in copper alloys.
  • Table 1 shows a part of the investigated various copper alloys, i.e., samples A to H, and the obtained results, i.e, the thermal conductivity and the weight changing ratio.
  • the weight changing ratio in Table 1 was obtained as follows. A sample was dipped in the condensed finish for treating a polyester yarn, which is a typical synthetic yarn, for 10 seconds, and then it was kept in a high temperature atmosphere, the temperature of which was 560°C. Thus, the above-described dipping and heating operation was repeated for 36 times in 200 hours. The weight of the sample before the treatment is designated by W 0 , and the weight of the sample after the treatment is designated by W 1 .
  • the absolute value of the weight change (W 1 -W 0 ) between before treatment and after treatment is divided by the weight (W 0 ) before treatment and is expressed by percentage, i.e., [100X(W 1 -W 0 )/(W 0 )], which is referred to as "weight changing ratio”.
  • the weight changing ratio thus obtained is considered to be an indicator of corrosion resistance. In short, as the weight changing ratio becomes smaller, the corrosion resistance increases.
  • Fig. 5 is a diagram illustrating the influence of the aluminum contents in copper alloys to the weight changing ratio and the thermal conductivity of the heating plate. From Fig. 5, it is apparent that the heating plate made of a copper alloy, the aluminum content of which is at least 3%, has high corrosion resistance, good molding characteristics and even distribution of temperature. Further, in view of even heating of the heating plate, it is preferred that the aluminum content is equal to or less than 11%, more preferably, less than 8%, and the thermal conductivity of about 41.9 J/ms°C (0.1 Cal/cm ⁇ s ⁇ °C) can be obtained. If the corrosion resistance is weighed, the thermal conductivity may be about 29,3 J/ms°C (0.07 Cal/cm ⁇ s ⁇ °C).
  • the distribution of temperature of the heating plate made of the material of sample C in Table 1 is designated by a solid line in Fig. 4.
  • the heating plate made of sample C shows a distribution of temperature similar to that of the heating plate made of brass. Further, as is apparent from Table 1 and Fig. 5, the heating plate made of sample C has small weight changing ratio, and accordingly, it has a good corrosion resistance.
  • the heating plate of the high temperature heating apparatus has at least one longitudinal groove for providing a yarn passage extending along the yarn path and formed on the surface thereof. As a result, the heating plate is molded upon its manufacture.
  • the molding characteristics have been investigated with respect to samples A to H, and the results as described in Table 1 were obtained. More specifically, the molding operation is very difficult for the materials with aluminum contents higher than 6% and less than 8%. Accordingly, it is very important to find out preferable aluminum contents with respect to the molding characteristics. It is confirmed that aluminum contents in weight percentage are selected to be at least 3%, more preferably, between 3 and 6% or between 8 and 11%, on the basis of a copper alloy, the copper contents of which is at least 60%.
  • the heating plate of the heating apparatus illustrated in Fig. 1 was manufactured with the material of the above-described sample C, and the obtained heating apparatus was disposed on a draw false texturing machine illustrated in Fig. 3.
  • the upper heating plate 11 was set at a temperature of 550°C, while the lower heating plate 21 was set at a temperature of 255 o C.
  • a partially oriented polyester yarn (POY) 137 dtex/36fil of (125 denier/36 fil) was drawn at a draw ratio of 1.78, and at the same time, twists were imparted to the yarn by means of false twisting device comprising three shafts with a plurality of discs.
  • Twists run back along the textured yarn were heat set by means of the above-described heating apparatus, and the yarn was wound into a yarn package at a texturing speed of 1,000m/min. After a utility examination wherein he above described false texturing process was performed was done for six months, there was no problem with respect to the oxidation resistance, the corrosion resistance and yarn quality.
  • a problem of corrosion resistance of the heating plate of an apparatus for heating a synthetic yarn inherent to enhancement of the heating temperature can be obviated.
  • the corrosion resistance against finish which will be vaporized and decomposed in the heater is increased by adding aluminum contents in the copper alloys.
  • aluminum contents in weight percentage are selected to be at least 3%, more preferably, between 3 and 6% or between 8 and 11%, on the basis of a copper alloy, the copper content of which is at least 60%. If the aluminum content is less than 3%, a problem of low corrosion resistance may remain, and if the aluminum content is more than 6% and less than 8%, molding characteristics may be deteriorated.
  • the above described range of aluminum contents is recommended.
  • the aluminum content is equal to or less than 11%, more preferably, less than 8%, and the thermal conductivity of about 41.9 J/ms°C (0.1 Cal/cm ⁇ s ⁇ °C) can be obtained. If the corrosion resistance is weighed, the thermal conductivity may be about 29.3 J/ms°C (0.07 Cal/cm ⁇ s ⁇ °C).

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
  • Resistance Heating (AREA)
EP94100099A 1993-01-19 1994-01-05 Apparatus for heating synthetic yarns Expired - Lifetime EP0607799B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP23712/93 1993-01-19
JP2371293 1993-01-19

Publications (2)

Publication Number Publication Date
EP0607799A1 EP0607799A1 (en) 1994-07-27
EP0607799B1 true EP0607799B1 (en) 1998-04-01

Family

ID=12117959

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Application Number Title Priority Date Filing Date
EP94100099A Expired - Lifetime EP0607799B1 (en) 1993-01-19 1994-01-05 Apparatus for heating synthetic yarns

Country Status (8)

Country Link
EP (1) EP0607799B1 (enrdf_load_stackoverflow)
JP (2) JP3300771B2 (enrdf_load_stackoverflow)
KR (1) KR100231865B1 (enrdf_load_stackoverflow)
CN (1) CN1038861C (enrdf_load_stackoverflow)
DE (1) DE69409267T2 (enrdf_load_stackoverflow)
IN (1) IN180971B (enrdf_load_stackoverflow)
MY (1) MY111642A (enrdf_load_stackoverflow)
TW (1) TW259821B (enrdf_load_stackoverflow)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100212641B1 (ko) * 1995-04-14 1999-08-02 마츠모토 쇼조 비접촉형 선조재 가열 장치
JP2011047074A (ja) * 2009-08-27 2011-03-10 Tmt Machinery Inc 仮撚加工機
CN102358969A (zh) * 2011-10-10 2012-02-22 浙江越剑机械制造有限公司 高温变形加热箱用整体加热装置
CN104120498B (zh) * 2013-04-24 2017-01-04 中国纺织科学研究院 一种牵伸/干燥丝用装置
CN104600005A (zh) * 2014-12-24 2015-05-06 苏州华冲精密机械有限公司 一种封装专用的烘烤箱
TWI602965B (zh) * 2015-01-22 2017-10-21 財團法人紡織產業綜合研究所 紡織設備以及使用其製作熔噴纖維的方法
RU2020113419A (ru) * 2017-10-16 2021-11-19 Хеберлайн Аг Нитенаправляющее устройство
CN108360110A (zh) * 2018-04-13 2018-08-03 灵氟隆新材料科技江苏有限公司 聚四氟乙烯长丝用定型机
JP2022188749A (ja) 2021-06-09 2022-12-21 Ｔｍｔマシナリー株式会社 加熱装置、及び糸加工機
JP2024018984A (ja) 2022-07-27 2024-02-08 Ｔｍｔマシナリー株式会社 シックアンドシン糸の製造方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9017087D0 (en) * 1990-08-03 1990-09-19 Rieter Scragg Ltd Yarn heating arrangement
DE4318674A1 (de) * 1992-06-06 1993-12-09 Barmag Barmer Maschf Vorrichtung zum Erhitzen eines laufenden Fadens

Also Published As

Publication number Publication date
CN1038861C (zh) 1998-06-24
JP2002146640A (ja) 2002-05-22
DE69409267T2 (de) 1998-11-05
JP3300771B2 (ja) 2002-07-08
IN180971B (enrdf_load_stackoverflow) 1998-04-11
TW259821B (enrdf_load_stackoverflow) 1995-10-11
KR100231865B1 (ko) 1999-12-01
JPH06272124A (ja) 1994-09-27
KR940018500A (ko) 1994-08-18
JP3579665B2 (ja) 2004-10-20
EP0607799A1 (en) 1994-07-27
DE69409267D1 (de) 1998-05-07
MY111642A (en) 2000-10-31
CN1098452A (zh) 1995-02-08

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