• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The woven conveyor belt, especially in toluated weave, for the heat treatment of vapor phase products, especially textile yarns, comprises warp yarns which are exclusively made of para-aramid copolymer, preferably in a copoly (paraphenylene / 3 , 4'-oxydiphenylene terephthalamide). Preferably, the warp yarns and the weft yarns are exclusively of para-aramid copolymer.
    公开号:BE1018043A3
    申请号:E2008/0152
    申请日:2008-03-12
    公开日:2010-04-06
    发明作者:Guyader Eric Le
    申请人:Bourgeois E；
    IPC主号:
    专利说明:

    TRANSPORTING TAPE IN PARA-ARAMID COPOLYMER YARNS
    The present invention relates to a woven conveyor belt for the heat treatment of products, especially textile threads, in the vapor phase.
    In the present text, the term "woven conveyor belt" denotes a textile piece, obtained by weaving, which is shaped in a loop so as to be arranged, under tension, on rollers of which at least one of between them is rotated, for the movement, generally continuous, said textile piece whose upper strand is a surface capable of supporting products for their displacement.
    On the occasion of the displacement of the products arranged on the upper strand of the woven conveyor belt, said products can undergo a treatment, in particular a thermal treatment in the vapor phase, by passing the conveyor belt through at least one treatment chamber comprising means for producing heat and steam.
    The products are deposited on the conveyor belt in the upstream portion of the treatment chamber, pass through said enclosure and are discharged from the band in the downstream part thereof. The terms "upstream" and "downstream" are used with reference to the direction of travel of the conveyor belt.
    It is known to thermally treat, continuously, textile threads in the vapor phase, in particular for their heat setting.
    Given the processing time that is necessary to achieve the desired effect, it is preferable to perform on the conveyor belt a certain accumulation of son.
    To do this, it is also preferable to deposit the wire on the upstream portion of the conveyor belt in an ordered configuration, making it possible to control the width of the portion of the strip occupied by the wire. In particular it is known to deposit the yarn by giving it a circular movement during the continuous movement of the conveyor belt, so that, on the upper end thereof, the yarn is in the form of a continuous succession of turns partially overlapping. The interest of this presentation lies particularly in the ease of recovery of the wire at the exit of the conveyor belt, despite the retraction that can undergo the wire during its treatment in the enclosure. The accumulation of the yarns on the conveyor belt in an ordered configuration can be obtained by other means, for example by a zig-zag deposit, in the form of a transverse sweep over a determined width.
    On the same conveyor belt, of great width, one can deposit several longitudinal accumulations of son. However, and more generally, a strip of smaller width is used, substantially corresponding to the width of a single accumulation of wire on the upstream portion of the conveyor belt, as in document FR 2.566.013.
    This allows greater flexibility of use of the same treatment facility.
    It is understood that, under these conditions, the conveyor belt must be able to meet a certain number of technical constraints, because of the successive passages between the ambient atmosphere of the premises where the installation is located and the internal ambient atmosphere of the enclosure treatment, in the hot vapor phase and also because the band must be constantly under high voltage so that its upper strand is as flat as possible.
    The ideal conveyor belt must therefore have good dimensional stability, both in length and width, under the temperature and steam conditions of the treatment. It must also have good resistance to abrasion to avoid premature wear due to friction on the carrier rollers. It must also have good porosity so that the action of the steam can be done throughout the volume of son accumulated on said strip. It must finally keep a good rectitude when it is put under tension.
    In the document FR 2,566,013, the small width conveyor belt is made of stainless metal, either in the form of a metal sheet provided with perforations or in the form of a wire mesh. This is a specific and therefore expensive manufacturing, the implementation of which is not always optimal, with possible problems of condensation.
    It has been sought to produce a conveyor belt from conventional textile yarns.
    However, the materials conventionally used for the manufacture of conveyor belts, that are polyester and polyamide, do not make it possible to achieve the ideal objective mentioned above, in particular because of excessive lengthening and poor thermal behavior over time.
    Some improvement has been obtained by implementing, for the manufacture of a conveyor belt, filaments, known under the name NOMEX® which are meta-aramid threads. This improvement mainly concerned the thermal resistance, the NOMEX® strips still having poor dimensional stability both in width and in length. In practice, it has been found, after several days or weeks of operation, a very significant decrease in the width of the band, a decrease of up to more than 20%. The solution implemented to overcome this drawback is to make strips having a width much greater than that which is theoretically desirable and to carry out regular voltage adjustments on the installation until the width stabilizes at its end. lowest point.
    This solution is hardly satisfactory from an industrial point of view.
    In FR 2,870,222 a conveyor belt has been proposed which is presumed to be close to the ideal band defined above. It is a woven strip which is composed of warp yarns which are exclusively para-aramid, in particular known under the names TWARON® and KEVLAR®.
    However, if the implementation of this band has made it possible to overcome the disadvantage observed with the meta-aramid yarns known under the name NOMEX, concerning its shrinkage, it appears from the experiments carried out, that it has in operation a duration of life clearly insufficient. Indeed it has areas of weakness or break after a few dozen hours, which requires frequent replacement and therefore production stops and, therefore, significantly increases the cost of treatment.
    The object of the present invention is to provide a conveyor belt which overcomes the disadvantages of the aforementioned bands and which is as close as possible to the ideal band defined above.
    According to the present invention, the woven conveyor belt for the heat treatment of vapor phase products, especially textile yarns, comprises warp yarns which are exclusively made of para-aramid copolymer. Surprisingly, this selection makes it possible to considerably increase the service life in operation without causing annoying shrinkage of the band.
    The best results have been obtained with warp yarns which are in a para-aramidic copolymer known under the trademark TECHNORA® which is a copoly (paraphenylene / 3,4'-oxydiphenylene terephthalamide) of formula:
    Preferably, the warp yarns and the weft yarns are exclusively of para-aramid copolymer.
    As regards the titration of the para-aramid copolymer yarns used in the composition of the conveyor belt, it is preferably of the order of 1000 to 1700 dtex.
    Preferably, this band is woven in a plain weave.
    In this case, preferably, in order to obtain the desired mechanical strength, it comprises either 15 to 17 threads per cm in warp and 6 to 8 picks per cm in weft, for warp threads in the order of 1100 dtex. and weft yarns of the order of 1100 to 1330 dtex, optionally para or meta-aramid, of 11 to 12 yarns per cm in the warp and 5.5 to 7.5 weights per cm in weft for warp yarns of the order of 1670 dtex and weft yarns of the order of 1100 to 1330 dtex, optionally para or meta-aramid.
    These particular textures make it possible to obtain a very good porosity for the passage of steam.
    As regards in particular the transport of a textile yarn in the form of an ordered accumulation of yarns, said strip has a width of between 70 and 500 mm, preferably between 150 and 250 mm.
    With particular regard to a conveyor belt for thermofixing dyestuff-impregnated textile yarns, typically the polyamidamide copolymer yarns and any other yarns are free from sizing agents. It is indeed important that no sizing product can migrate on textile son deposited on the strip and pollute the dye before heat-fixing it on the fibers.
    The present invention will be better understood on reading the description of a specific embodiment, given on a non-exclusive basis, illustrated by the appended drawing in which the single figure is a diagrammatic representation in top view of a treatment plant. thermal vapor phase textile yarn equipped with a set of narrow conveyor belts.
    The installation 1 comprises a treatment chamber equipped with means for producing saturated steam at high temperature, of the order of 120 to 150 ° C. This enclosure is traversed by a set of conveyor belts 3 of small width, between 150 and 250 mm. Only three bands have been shown in the figure but this number can be much larger. In any case, it is sought that this number is the largest possible according to the passageway width available from the enclosure 2.
    Each conveyor belt 3 is stretched between rollers, in particular an upstream roll 4, at the inlet of the installation 1 and a downstream roll 5 at the outlet of the installation. One of the rollers 4,5 is equipped with rotation means for driving the band 3 in the direction of the arrow F.
    The installation 1 comprises a device, not shown, for depositing on each strip 3 one or more wires, the deposit being made in a circular manner during the displacement of the strip so that a continuous accumulation of turns occurs. 6 as shown in the figure. This ordered accumulation of turns 6 passes through the chamber 2 until the exit of the installation where there is provided a device, not shown, for taking up the individual son or son 7 constituting said accumulation 6.
    Each conveyor belt consists exclusively of warp and weft son of para-aramid copolymer. Preferably, these are para-aramid copolymer yarns known under the name TECHNORA® which is a copoly (paraphenylene / 3,4'-oxydiphenylene terephthalamide), of formula:
    In this case, the band 3 is formed by weaving in a plain weave, TECHNORA® yarn having a titration of the order of 1100 dtex, with 16 threads per cm and 7.2 weft per cm. Optionally, the band could comprise son of para-aramidic copolymer in warp, the weft son being for example para-aramid, especially son of KEVLAR® or TWARON® or meta-aramid, including NOMEX® yarns.
    The disproportion between the number of warp and weft threads, as indicated above, makes it possible to obtain a good porosity allowing the passage of the hot vapor while keeping a good dimensional stability.
    The implementation of such a conveyor belt makes it possible to reduce or even eliminate oversizing of the width of the strip with respect to the laying width of the yarn in the form of turns 6. It is thus possible to optimize the number of conveyor belts. likely to equip the same installation, for a speaker width 2 determined.
    It also makes it possible to considerably increase the service life of the strip, which is at least 100 hours, whatever the conditions under which the vapor phase heat treatment takes place, conditions which vary according to the nature of the son treated, for example a temperature of the order of 110 to 115 ° C, in generally acidic medium, for the wool and a temperature of the order of 130 to 135 ° C, in generally basic medium, for polypropylene and polyamide.
    The son 7 deposited in the form of turns 6 on the conveyor belts 3 were previously impregnated with a dye bath; the heat treatment is also used for the heat-fixing of the dye on the fibers. In this case, the son constituting the conveyor belts 3 must be free of sizing agent. Optionally, it is therefore necessary to subject the band or the fabric used in its preparation prior treatment for removing such sizing products, which would be likely to pollute the dye carried by the son before heat setting.
    The present invention is not limited to the specific embodiment which has been given above in a non-exhaustive manner. In particular, with regard to the titration and the number of warp and weft yarns, variations may exist depending on the type of application concerned. It is the same for weave armor which can be a twill or derived armor.
    权利要求:
    Claims (9)
    [1]
    A woven conveyor belt for the heat treatment of vapor phase products, especially textile yarns, wherein the warp yarns are exclusively para-aramid copolymer yarns.
    [2]
    2. Tape according to claim 1, characterized in that the weft son are exclusively para-aramid copolymer.
    [3]
    3. Band according to one of claims 1 or 2, characterized in that the son of para-aramid copolymer are in a copoly- (paraphenylene / 3,4'-oxydiphenylene terephthalamide).
    [4]
    4. Strip according to one of claims 1 to 3, characterized in that each para-aramid copolymer wire has a titration of the order of 1000 to 1700 dtex.
    [5]
    5. Strip according to one of claims 1 to 4, characterized in that it is woven in a plain weave.
    [6]
    6. The strip as claimed in claim 5, characterized in that it comprises from 15 to 17 threads per cm in warp and from 6 to 8 picks per cm in weft for warp threads of the order of 1100 dtex and threads. weft of the order of 1100 to 1330 dtex, optionally para-aramid or meta-aramid.
    [7]
    7. Strip according to claim 5, characterized in that it comprises from 11 to 12 son per cm of warp and from 5.5 to 7.5 weft son for warp son making about 1670 dtex and weft threads of the order of 1100 to 1330 dtex, optionally para-aramid or meta-aramid.
    [8]
    Band according to one of Claims 1 to 7, characterized in that, in the case of transporting at least one textile in the form of an ordered accumulation, it has a width of between 70 and 500 mm, preferably between 150 and 250 mm.
    [9]
    9. Strip according to one of claims 1 to 8, for the heat-fixing of textile son impregnated with a dye bath, characterized in that the son of para-aramid copolymer and any other son are free of sizing products. .
    类似技术:
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    同族专利:
    公开号 | 公开日
    FR2913675A1|2008-09-19|
    FR2913675B1|2009-06-05|
    ITTO20080200A1|2008-09-16|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE3843811C2|1988-12-24|1991-05-29|Alwit Gmbh Produktions- Und Handelsgesellschaft Fuer Arbeitsschutzartikel, 4240 Emmerich, De|
    FR2870222B1|2004-05-11|2006-08-11|E Bourgeois Soc Par Actions Si|CONVEYOR BELT IN PARA-ARAMIDE YARN|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    FR0753854|2007-03-15|
    FR0753854A|FR2913675B1|2007-03-15|2007-03-15|CONVEYOR BELT OF PARA-ARAMIDE COPOLYMER|
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