Bleaching and dyeing; fluid treatment and chemical modification – Fluid treatment – Gas or vapor
Patent
1988-08-25
1990-03-13
Bennet, Henry A.
Bleaching and dyeing; fluid treatment and chemical modification
Fluid treatment
Gas or vapor
68 5D, 68 20, 34 1, 34 68, 34 90, D06M 1334
Patent
active
049073109
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an installation of the continuous treatment of at least one textile yarn, comprising means for continuously winding at least one yarn picked up on a reel, a deposit head for depositing this yarn on a gas permeable conveyor belt, at least one thermal treatment enclosure, through which the yarn passes resting freely on the said conveyor belt, and an apparatus for taking up the yarn on the conveyor belt for rewinding it, the said thermal treatment enclosure comprising a drying apparatus of the yarn by the micro-wave or high frequency treatment, provided with forced ventilation means across the deposit of the yarn and the conveyor belt.
The use of heating by dielectric loss for the thermal treatment of textile yarns and particularly for their drying makes it possible to achieve speeds of evaporation which cannot be obtained by traditional means. In fact, it heats at the same time all of the water absorbed in the different portions of the volume of the material, which produces an excellent uniformity of treatment and a low duration of drying of a material presented in the form of a mass of relatively dense yarns. Presently this mode of drying yarns in high frequency dryers is used (on the order of 15-13 MHz) in which the yarns are introduced in the forms of reels. However, as normal reels have a low permeability to the passage of the vapor, the water vaporized has difficulty evacuating and rises in pressure and temperature, heating the material itself. The more the material heats, the greater its dielectric loss factor and it absorbs thus yet further energy. One achieves in this manner a thermal burst of energy condition, contrary to the normal self regulation phenomenon with result from the diminution of the loss factor as a result of the progressive dimunition of moisture. This thermal burst of energy can lead to a melting together or localized carbonization of the yarn. It is very difficult to remedy it, other than by reducing the power and by forming reels of specially low density.
A solution to this problem is proposed in British application No. 1,583,953. It is an installation in which a continuous textile support, such as a fabric or group of parallel yarns, continuously passes through a printing fixation chamber. In this chamber, the support is subjected at the same time to a micro-wave heating and to a ventilation going through it. The combination of a relatively thin deposit of the yarns on the conveyor belt with a heating by dielectric loss makes it possible to assure an appropriate forced ventilation across the deposit of yarns and to eliminate the risk of thermal burst of energy, by virtue also of the fact that the density of the deposit of the yarns can be about 10 times less than that of the reels. One thus profits from the self-regulation of the drying peculiar to this principle of heating and one obtains at the output a uniform humidity of the yarn, which can be adjusted in an optimum manner in view of a normal take up rate. Yet the apparatus proposed produces a rapid drying during the thermal treatment, which does not make it possible to operate a thermal treatment in which the textile product must be maintained during a certain time in an atmosphere which is both hot and humid.
The present invention has as an aim to overcome this disadvantage, by virtue of installation which functions continuously.
To this end, the invention relates to an installation of the type indicated above, characterized in that the said thermal treatment enclosure comprises a fixation zone, provided with a tubular sheath surrounding the conveyor belt and the yarn deposited thereon, this sheath having a double wall made of a material permeable to the high frequency or micro-waves utilized and enclosing in this double wall a circuit of heating fluid, and a drying zone situated downstream of the fixation zone, the assembly constituted by the fixation zone and the drying zone being equipped with high frequency or micro-wave generator.
The deposit head is preferably a head depositing the yar
REFERENCES:
patent: 4104019 (1978-08-01), Smith
Bennet Henry A.
Sollecito John
Superba S.A.
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