• 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:
    Method for the localized marking of clothes consisting of the application in the clothes to be marked of a chemical product that when activated with heat produces a change of color in said area of the clothing and the activation of the product in the area of the clothing to be marked by the precise application of heat by laser. This method allows a great definition of the marked area without affecting the resistance properties of the clothing or fabric in question.
    公开号:ES2664127A1
    申请号:ES201631338
    申请日:2016-10-17
    公开日:2018-04-18
    发明作者:Enrique Silla Vidal
    申请人:Jeanologia SL；
    IPC主号:
    专利说明:

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    DESCRIPTION
    Method for localized clothing marking.
    Object of the invention.
    The object of the present invention is a method for the localized marking of clothing, based on the activation of a chemical applied to the clothing by means of the energy provided by a laser.
    Said method has particularities oriented to carry out said activation in a localized manner, at the punctual level, in order to obtain, if required, a large definition of the discolored area, without affecting the resistance properties of the clothing or tissue in question.
    Field of application of the invention.
    This invention is applicable in the textile sector for the localized marking of clothing and mainly, but not limited to, the marking of 100% cotton Denim fabrics, and Denim fabrics of blends of cotton and synthetic fibers.
    State of the art
    Different methods for the localized marking of clothes and fabrics and particularly 100% cotton Denim fabrics are currently known in the textile sector. These methods can be encompassed generically in mechanical, chemical and physical methods.
    A mechanical method for localized discoloration of tissues is to sand these tissues manually, with a sheet of paper, or with a mechanical abrasion tool. This technique has several drawbacks since the final result depends on the skill of the operator. Other negative factors linked to this technique are, for example, the low capacity of industrial reproducibility of designs. But the main problem of this technique is the important risk factor
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    which means for the worker to be subjected to such an aggressive repetitive movement during repeated working hours. In addition, the degree of discoloration obtained with this technique is not sufficient in most cases, which forces it to be combined with other techniques such as application by means of potassium permanganate spray (technique described below).
    Another mechanical technique of discoloration of the tissue consists in projecting a high pressure sandblasting over the area of the tissue to be discolored. As in the case of manual sanding, this technique also has many drawbacks.
    It is important to note that the industrial practice of this technique has been banned by different brands since silica, the main component of sand, generates a powder that easily penetrates the lungs of workers producing a lethal respiratory disease called silicosis.
    The use of the laser to create a localized discoloration effect in a tissue is currently the most widespread method, mainly applied in Denim tissue. It consists of applying heat directly to the tissue by means of a laser beam, as disclosed in US Patents 5,990,444 and US 6,819,972. This method achieves discoloration by the combination of surface scorching of colored fibers and sublimation. of the dye due to the heat provided by the laser beam.
    This method allows to obtain a good definition and / or a good degradation of the discolored zone, so this first method is preferred and widely used for local discoloration. However, it has important limitations of use. On the one hand, in most fabrics this technique does not get the white color, so it is necessary to add a chemical process. On the other hand, the introduction of other fibers in combination with cotton to provide different characteristics to Denim fabrics, and in particular the introduction of small amounts of polyester fibers, limits the use of laser as a viable alternative, since the heat of the Laser at a specific point melts the polyester fiber, resulting in a drastic decrease in the resistance of the fabric and the consequent breakage of the same. The reduction of tissue exposure time to the laser decreases
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    the loss of resistance of the tissue, but also reduces the energy provided for the superficial burning and sublimation of the dye, so that no visible discoloration is achieved. This limitation of the use of laser as an agent for discoloration of Denim fabrics also affects light 100% cotton fabrics due to the loss of resistance.
    A chemical bleaching technique is based on the localized application of potassium permanganate, which results in the destruction of clothing color only in the area where it has been applied. When it is intended to discolor a defined area gradually, the application of potassium permanganate is done by spraying. If on the contrary what is desired is to have a drawing, then conventional screen printing methods will be used for this application.
    A second method of chemical discoloration is based on the use of chemical compounds based on organic and inorganic salts with oxidizing properties capable of destroying the color by chemical oxidation of the dye with which the fibers are dyed (indigo dye in the case of fabrics Denim)
    The application of these oxidants must be done: either over the entire surface of the fabric, automatically, with conventional methods of application such as exhaustion, scarfing, printing, etc., in case of tissue, and systems for exhaustion or immersion in the case of garments, or locally manually by applying the chemical with a sponge or spray gun in the specific area to be discolored; subsequently introducing the garment in a heat chamber, dryer or curing oven, exposing it at a suitable temperature and for a certain time to activate the reaction and that the oxidizing products react with the fiber to produce oxidation and therefore the elimination of color. The activation of the chemical requires a specific temperature and exposure time. A slight excess in temperature or exposure time will adversely affect tissue resistance which makes this operation critical.
    A third technique, which is based on the use of chemicals that are attached to clothing when heat is applied. In this case it is not a discoloration but
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    of a simulation of it by adding locally the color that would result from such discoloration.
    For these last two techniques, which are presented as viable alternatives from the environmental and safety point of view for the worker, the problems are specifically:
    - the application of the chemical on the garment does not allow a good precision and definition of the areas or images to be discolored;
    - the limitation in the patterns (drawings / designs) to be reproduced and;
    - the risk of destroying the fabric by the application of an excess of temperature during the realization, since the chemical reaction, in combination with the temperature and the time, drastically affects the resistance of the cotton fabrics.
    Description of the invention
    As a solution to the exposed difficulties, a method based on the activation of the mentioned chemicals has been developed by caloric contribution of a laser beam. The laser will replace conventional systems as the main energy source, thus achieving greater precision than that achieved with a curing oven, a dryer or a conventional heat chamber.
    The action of the laser in this application is to provide the energy necessary for the activation of the chemical, so that it is the chemical that marks the clothes, and not the laser as in other applications.
    The developed solution allows:
    - Activate in a controlled manner, and in the desired area, the chemical applied to the tissue, obtaining high precision and definition of the areas to be discolored;
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    - apply different caloric intensity at each point or pixel, which allows the achievement of gradients impossible to achieve with chemical or manual techniques;
    - eliminate the risk of breakage and decrease the resistance of the tissue, by controlling the activation energy of the chemical. The method of the invention ensures a constant and controllable energy contribution by the exposure time of the laser beam to the chemical,
    - make markings located on any kind of clothing, be it leather, fabric blends or light fabrics such as 100% cotton.
    - Contaminate less and waste less water than in methods that use more aggressive chemicals.
    - increase the processing speed compared to traditional laser marking methods.
    To achieve these objectives, the method of the invention comprises:
    a) the application on the clothing to be marked of a chemical that when activated with heat, in an area of the clothing to be marked, causes a color change in said area of the clothing;
    b) the activation of the product in the area of the clothing to be marked by the timely application of heat by laser.
    As expected, the application of the chemical in the clothing can be done both in a localized area and globally, and by conventional methods, such as immersion, scarfing, depletion, stamping, micronization or spraying .
    In this invention, the laser is used as an agent to partially or totally provide the energy / temperature that selectively activates the chemical previously applied to the clothing. In this case, a much smaller energy contribution is required than in the conventional marking method, so that all types of substrate are allowed to be labeled, including fragile or very light fabrics such as 100% cotton or polyester, since reduce the amount of
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    energy, the tissue does not absorb it and therefore there is no burning or melting effect of the fibers. In this way, its resistance is not affected.
    The energy range to activate this type of chemical is between 10 and 40 mJ, although when used in cotton or polyester clothing the appropriate energy range to be applied is between 15 and 30 mJ. These amounts of energy are sufficient to activate the product, but not to be absorbed by the tissue and by themselves cause a visible marking on the tissue. Nor would it produce in the tissue a reduction in resistance or fusion of the fibers that compose it.
    A part of said energy can be provided by another conventional heat source, such as an infrared heater or a curing oven, and the selective activation of the chemical is carried out by means of the laser, so that it can be a power lower than the mentioned values.
    The marking will be achieved where the chemical has been applied to the clothing and activated point to point (pixel to pixel) by the laser energy. Since the temperature necessary for the activation of the chemical is precisely provided by the laser, it will be possible to obtain images as defined and perfect as needed.
    In those areas of the clothes where the chemical has not been activated with the laser, said chemical can be easily removed without any marking in these areas.
    Said removal of the non-activated chemical can be carried out by any conventional washing method, such as the application of water, air, brushing and / or by a mechanical, chemical or wet system.
    As usual in laser tissue marking, the activation of the chemical can be carried out following paths that allow the generation of clothing
    visual effects of spinning, virtual fabrics, stone washing or discoloration.
    The present invention solves a technical barrier that allows the increase of productivity, the reproducibility of effects on an industrial scale and the necessary homogeneity in the production of garments. In addition, the quality of the final product increases, increasing the useful life of the garments, since the resistance of the clothes will not be affected.
    权利要求:
    Claims (12)
    [1]
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    1. Method for localized clothing marking, characterized in that it consists of:
    a) the application on the clothing to be marked of a chemical that when activated with heat causes a color change in said area of the clothing
    Y;
    b) the activation of the product in the area of the clothing to be marked by the timely application of heat by laser.
    [2]
    2. Method according to claim 1, characterized in that the chemical applied to the clothing is oxidizing and when activated with heat destroys the color of the clothing by chemical oxidation.
    [3]
    3. Method according to claim 2, characterized in that the applicable chemical is formed by a combination of organic and inorganic salts with oxidizing properties.
    [4]
    4. Method according to claim 1, characterized in that the chemical applied to the clothing remains fixed thereon when activated by heat.
    [5]
    5. Method according to any of the preceding claims, characterized in that the laser used for the timely application of heat in the area of the clothing to be marked is CO2.
    [6]
    Method according to any of the preceding claims, characterized in that the energy applied with the laser is between 10 and 40 mJ.
    [7]
    Method according to any of the preceding claims, characterized in that the energy applied with the laser in the marking of cotton or polyester clothing is between 15 and 30 mJ.
    [8]
    Method according to any of the preceding claims, characterized in that it comprises the removal of the non-activated chemical after the application of heat in the area to be marked.
    [9]
    Method according to the preceding claim, characterized in that the elimination of the non-activated chemical is carried out by the application of water, air, brushing and / or by a mechanical, chemical or wet system.
    Method according to any of the preceding claims, characterized
    because a part of the energy necessary for the activation of the chemical comes from a secondary heat source other than the laser.
    [11]
    Method according to the preceding claim, characterized in that the secondary heat source is an infrared heater or a curing oven.
    [12]
    12. Method according to any of the preceding claims, characterized in that the application of the laser on the chemical is carried out following paths that generate visual effects of spinning, of fabrics
    15 virtual, stone washing or fading.
    [13]
    13. Method according to any of the preceding claims, characterized in that the application of the chemical is carried out by immersion, depletion, stamping, micronization or spraying.
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    同族专利:
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    US5268002A|1989-03-10|1993-12-07|Ecolab Inc.|Decolorizing dyed fabric or garments|
    WO1994006962A1|1992-09-23|1994-03-31|Burlington Industries, Inc.|Fabric finishing procedure|
    US5567207A|1994-07-31|1996-10-22|Icon, Inc.|Method for marking and fading textiles with lasers|
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    US6819972B1|1999-10-05|2004-11-16|Clarence H Martin|Material surface processing with a laser that has a scan modulated effective power to achieve multiple worn looks|
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    US6685868B2|1995-10-30|2004-02-03|Darryl Costin|Laser method of scribing graphics|
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    US10442233B2|2013-09-19|2019-10-15|Revolaze, LLC|System and method of generating a pattern used to process a surface of a fabric through laser irradiation, and fabric created thereby|
    EP3387183A1|2015-12-10|2018-10-17|Acticell GmbH|Treatment of textile material|
    CN105672008B|2016-04-01|2017-08-08|成都纺织高等专科学校|A kind of laser thermal induction reduction reaction type discharging agent and its preparation method and application|WO2020023718A1|2018-07-25|2020-01-30|Vf Jeanswear, L.P.|Chemical based modification of fabric color|
    法律状态:
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    优先权:
    申请号 | 申请日 | 专利标题
    ES201631338A|ES2664127B2|2016-10-17|2016-10-17|Method for localized clothing marking|ES201631338A| ES2664127B2|2016-10-17|2016-10-17|Method for localized clothing marking|
    PCT/ES2017/070650| WO2018073468A1|2016-10-17|2017-10-04|Method for the localised marking of clothing|
    CN201780063879.6A| CN109844217B|2016-10-17|2017-10-04|Method for locally marking a garment|
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