PT103364B - AGING PROCESS OF PARTS CONTAINED WITH THE USE OF DECOLORING, REDUCING OR OXIDANT AGENTS BY ASPERSION - Google Patents

Abstract

The present invention relates to a process of unbleached and non-uniformizing of textiles, through the application by spraying of reducing agents or oxidizers in pre-wiped and worn parts by the mechanical action of an abrasive agent.

Description

DESCRIPTION

AGING PROCESSING PARTS CONFECTED WITH THE USE OF DECOLOR COLORING, REDUCING OR OXIDATING AGENTS

Domain of Technique

The present invention relates generally to aging processes of fabric or clothing made, and in particular, describes an advanced aging process which substantially reduces production costs and has a great versatility of execution, allowing to obtain various effects. many different.

State of the Art

The following publications are representative of the most relevant state of the art at the time of the present patent application.

PATENTS EP0238779 22.10.86 Ricci, Francesco EP0298412 04.07.88 Ricci, Francesco EP0303120 Jul 29, 88 Ricci, Francesco US4852990 Aug 01, 89 Patterson, James R. EP0554480 04.02.92 Ricci, Francesco US5298027 Mar 29, 94 Kuno, H. et al. EP0704524 Sep 05, 1995 Caneva, Philippe EP1433886 10.10.03 Iachini, Dino

Today, and as is well known, the use of aging clothing is widespread according to fashion trends. For this reason, garment manufacturers, such as jeans manufacturers, undergo their treatments to achieve a used look, even when new. However, this trend requires achieving an increasingly realistic used effect. This trend needs a specialization of the processes by which these treatments are carried out. Moreover, the areas in which the effect used is to be achieved are subject to change over time.

At present, clothes are aged through wear processes, or through chemical agents. Known aging processes involve the application of an oxidizing or reducing agent in a carrier, pumice or other absorbent medium which will then pass the chemical agent to the fabric or mesh, thereby aging the contact zones and reserving the same. others giving a light / dark effect.

These processes have some disadvantages. Among which is the fact that a large amount of chemical is used to impregnate the means of transport (pumice or other); On the other hand, the uniformity of the amount of the chemical in the medium (pumice or other) at the time of use is difficult to control (premature dehydration, gravity oxidation or reduction).

European patents EP0238779, EP0298412 and EP0303120 generally refer to a process for occasionally dyeing or imparting an aged or worn appearance to fabrics or garments made. Thus, the described method consists of the following steps:

- impregnate the permeable granules of coarse material which have a high absorption characteristic with a coloring or bleaching substance;

placing the impregnated granules together with the fabric or garments in a rotating drum;

- staining or discoloration by dry rotating the drum containing the granules and the cloth or clothing;

- recovery or separation of granules from dyed or discolored clothing or fabrics;

- neutralization of the residual coloring or bleaching agent on the cloth by a normal wash cycle.

However, this method entails a number of disadvantages in both economic and production spheres. Impregnation of porous material particles or granules (pumice, silica gel, polystyrene granules, sand, etc.) implies the use of large amounts of chemical agent (coloring, bleaching or bleaching), which significantly increases the cost. the entire process. On the other hand, the method described in those patents proves to be very restrictive with regard to the final product as it does not allow for personalized effects.

European patent EP0554480 describes a non-uniform aging process of dyed textile products, consisting of the following steps:

- coating the surface of the textile product to be treated with a material resistant to bleaching and / or bleaching chemicals;

- breaking said coating at random and at various points by the action of a mixer;

then treating the textile product with an aqueous solution of a bleaching and / or bleaching agent for a period of time suitable to achieve the desired aged or used degree of effect;

- removal or neutralization of any bleaching or bleaching chemical residues that may have remained in the tissues;

- removal of textile products from chemical resistant coating material.

However, this method has some limitations.

Due to the way the resistant coating is applied (on one or both sides of the part to be treated) and subsequently broken (by the action of the agitator), it gives only two effects: one side with the intended used or aged effect and the other side discolored or bleached evenly, or both sides worn or aged. On the other hand, said process is somewhat expensive due to the number of stirring and heating steps, as well as the operating time, as well as the amount of bleaching and / or bleaching agent required, since the parts are washed with an aqueous solution of the agent used to reflect the cost of the final product.

US4852990 relates to a uniform bleaching process on both sides of the workpiece and in a single step. To this end, the bleaching cycle consists of an aqueous bath containing a mixture of bleaching agent and polyacrylamide. However the application of this method is restricted to the total bleaching or discoloration of the garment or fabric.

Although US 5298027 describes various abrasive particle alternatives and their method of manufacture, the discoloration method suffers from the same flaws as the above processes.

European patent EP0704524 relates to a process of total or partial discoloration of denim fabrics, both in fabric and in the finished garment, enabling a range of variable aspects to be achieved in aqueous medium at room temperature in the presence of a water-soluble salt. of permanganese acid. The various effect types are achieved by using different combinations of bath conditions in terms of pH, characteristics

cationic, anionic, amphoteric in the surfactant (s) used, as well as the nature of the reducing agent and the amount of permanganese acid. The limitations of this

The process is concerned with the fact that the end result is uniform, not conveying the idea of being used, as well as being difficult to implement given the number of solutions needed and parameters that require thorough control throughout the process.

European patent EP1433886 describes an aging process applied exclusively to trousers and an inflatable device (dummy) has been developed, the process consisting in the manual application of the bleaching solution to the desired locations. This process has several limitations, namely the low productivity inherent in the fact that the treatment has to be done piece by piece, and on the other hand, its applicability is restricted to a single type of clothing.

Object of the Invention The object of the present invention is to develop an aging method of solution namely to reduce fabrics or garments which drawbacks described above, the amount of chemical agent used, allow their applicability to a wider spectrum of articles, allow Achieving various standards without however requiring much labor or very lengthy and difficult steps to perform. Moreover, it is also an object of the present invention, as an alternative to randomly creating a pattern, to perform even this type of effect anywhere desired, thus being a versatile method.

It is also the object of the present invention to provide a method that promotes wear on the clothing to achieve the most natural effect possible.

The present invention thus enables more or less pronounced and more or less regular aging effects to be achieved, thereby avoiding some of the drawbacks inherent in conventional aging processes.

Brief Description of the Figures

Before giving a detailed description of the present invention, a brief description of the figures will be given.

Figure 1 is a block diagram illustrating the entire sizing of the aging process comprising both the preceding and the preceding method steps.

Figure 2 shows the equipment used, and where (4) is a window into the drum and (5) is the door through which the parts to be treated enter.

Figure 3 shows a detailed view of the door of the equipment where the nebulizer gun (2) is fitted.

Figure 4 illustrates the process of placing the bleach / bleaching agent into the reservoir / bag (6) which will in turn feed the gun (2).

Figure 5 shows two ways of treating garments (A and B).

Figures 6A and 6B show the step of spray application of the bleach / bleaching agent on pre-knotted (A) and loose (B) pieces.

Figure 7 illustrates the step terminals illustrated in Figures 6A and 6B, with the removal of already treated parts to subsequent neutralization.

Detailed Description

This process uses spray aging and aims to achieve a uniform aging aspect by the more or less sharp contrast between the surface areas (lighter) and the inner areas (darker) by combining chemical and mechanical agents. Before being subjected to the aging process itself, the clothes should go through the conventional treatment steps as shown in Figure 1, whether they are fabrics or made-up clothing. Thus, in A the pieces are pressed, in B they are softened by placing them in a hot water bath and in C they are dried; These three steps can be performed on standard equipment.

In step D, the dyed parts are waterproofed with hydrophobic chemical agents, fatty acids, polyethylene waxes, fluorocarbons or any other chemical that promotes hydrophobicity by depletion or spraying.

In case a particular effect is desired, there is an intermediate step E2 in which (B) the garments are tied in one or more places, which at the next step these garments retain the original color in their interior ie in areas that have been protected. Otherwise it is followed by step EI in which the parts enter the machine (1) stretched (A).

Then, in step F, the stretched or knotted garments (as described above) are placed together with the abrasive agent (which may be pumice, silica, sand, etc.) on the spinning drum of the machine (1). ) The dry machine is operated to remove part of the hydrophobic chemical, thereby obtaining hydrophilic surface zones and hydrophobic interior zones. After this step, the abrasive particles are collected, and the bleaching or bleaching agent is placed in the reservoir or raft (6) through the funnel (7), which by the action of the compressed air valve (8), will feed the gun. which in turn will project the bleach / bleaching agent into the machine (1) through the hole (3).

This is followed by step G, illustrated by figures 6A and 6B, in which the atomized bleaching agent which is absorbed only by the hydrophilic surface zones is applied, thus achieving uniform aging with light / dark contrast between the outer and inner zones.

The parts must be in constant rotation and as the amount of liquid applied is very small they remain practically dry, which facilitates their movement.

After application of the bleaching agent the parts should rest (step H) for some time (to be determined, taking into account the type and amount of bleaching used and the desired bleaching effect), followed by step I of neutralizing the bleaching machine. Conventional washing.

With this sprinkling aging process there is a possibility of other effects:

• Direct application of the bleaching agent to the dyed and dried parts, resulting in discoloration only on the outside, and may be more or less uniform depending on the spray, pressure and amount of bleaching agent used;

• application of the bleaching agent on knotted pieces;

• application of the bleaching agent on partially waterproofed parts (localized waterproofing).

This process is more environmentally friendly than conventional processes because the amount of chemical agent (oxidizing or reducing) used is much lower, thus facilitating application control.

Oxidizing chemical or reducing agent is used in varying amounts depending on the degree of aging desired and the sensitivity of the dyes involved in the pretense.

The spraying is done with a nebulizer gun (2), which is located in the door (5) of the rotary drum machine (1), through the hole (3) over the dry parts.

If very uniform aging is desired, an air atomizing spray nozzle should be used to obtain very small droplets.

If the droplet size increases (by changing the sprinkler or by lowering the pressure) an irregularity begins to result in a particular effect.

Parts intended for this purpose must be dyed with dyes which are sensitive to the chemical to be sprayed.

If in a trichrome all dyes have similar sensitivity, we will have a light / dark tone on tone effect.

If they do not have the same sensitivity, we will have bicolor effects.

The same goes for conventional aging processes. The difference in procedures from conventional aging begins after pretense. In the conventional case, the discolouration is by exposure to the upper bleaching agent, the lower zones being protected from discoloration.

In the present invention, the discoloration is by absorption of the bleaching agent into the hydrophilic zones, the hydrophobic zones being protected.

Claims (6)

1. Process of aging of made-up parts, characterized in that it comprises the steps of: • Waterproofing of parts dyed with water repellent chemical agents; • Placing said parts together with the abrasive granules within a rotating drum, which will operate dry for a sufficient period of time to randomly expose the areas of the parts to be discolored in the next step; • Spray application of the bleaching agent while the parts are in permanent rotational motion; • Rest period; Neutralizing residual bleaching agent maintained in the fabric by a normal wash cycle; Process of aging of made-up pieces according to Claim 1, characterized in that the dyeing of the dyed pieces is carried out with hydrophobic chemical agents, fatty acids, polyethylene waxes, fluorocarbons or any other chemical that promotes hydrophobicity. Process of aging of made-up parts according to Claims 1 and 2, characterized in that the waterproofing can be carried out by exhaustion or spraying, depending on the desired effect. Process of aging of garments according to claim 1, characterized in that the dry cleaning is done with granules obtained from pumice stone or any abrasive agent. Process of aging of garments according to claims 1 and 4, characterized in that the dry cleaning with the abrasive agent removes part of the hydrophobic chemical agent, randomly obtaining hydrophilic surface areas (permeable to the bleach) and hydrophobic zones (impervious to Process of aging of garments according to claim 1, characterized in that when spraying the bleaching agent it is absorbed only by the randomly formed hydrophilic surface areas by the abrasive action of the granules.