DE9002975U1 - Ready-to-use packaging for water-soluble dyes and/or chemicals - Google Patents

Description

HOECHST ACTIVE SHAREHOLDER T..:: I HOE 90/F 086 G Dr.CZ/fe ....... ...

Description

Ready-to-use packaging for water-soluble dyes and/or chemicals

The present innovation relates to a simple, ready-to-use packaging for water-soluble dyes and/or chemicals in a bag-like format.

Water-soluble dyes in powder form must be dissolved in order to be used for dyeing textile materials, usually with hot water or simply in cold water. This solution is then added to the actual dyeing mixture through a wool or calico filter in order to systematically retain any dye particles that have remained dissolved. The same procedure also applies to some extent to chemicals that are required during the dyeing process. When dyes are used in the dyeing process, the same procedure must essentially be followed. However, this type of action has clear disadvantages.

To achieve better solubility, the dyes are usually powdered as finely as possible during production. As a result, the risk of dust is increased, which not only pollutes the environment but also means that the user may come into direct contact with the dye. Even when using dye granules, such contact often cannot be avoided. It is therefore always necessary to clean the tools used and usually also the hands afterwards, using agents that are sometimes quite aggressive and can even decolorize. Special protective measures are also recommended due to the potential risk to the respiratory tract.

This seems rather complicated, even problematic, under the circumstances discussed above.

&ggr;& * ·· ·····♦ ·· · a

&iacgr; in-solution-bringing the selected for dyeing

Dye/fixing agent can usually not be avoided. If the method of operation in question

U standing type nevertheless against the practice-based

.5 experiences, then spotty coloring &lgr; cannot be prevented.

> The task posed to the practitioner consisted of

&ngr; present case is therefore a packaging for

to create weighed quantities of dyes and/or chemicals for convenient and environmentally friendly introduction into a liquid application medium, which in the course of their handling

a) prevents any skin contact between the user and the treatment agents used or their inhalation,

b) due to its material properties, it is also so dense that dust from the dry contents of the packaging

from the casing cannot take place,

c) whose porous shell structure, on the other hand, allows the liquid application medium (primarily water) allowed to seep into the sealed packaging

and to ensure a perfect dissolution of the solids deposited therein, and finally

d) the diffusion of dissolved substances is not hindered and, if necessary,

undissolved components in the packaging thus ensuring an even distribution of the treatment agent in the application fleet.

The task defined above is now accomplished by mixing weighed quantities of water-soluble dyes and/or chemicals in solid, dust-prone

State, in particular in powder form or also as granules, between at least two layers of a water-insoluble, but water-permeable, solidified nonwoven fabric made of synthetic thermoplastic fibers, 7. , B, made of polyester, polyamide or polypropylene fibers, in the form of a bag with the edges tightly welded on all sides.

Due to the bag-like packaging suitable for holding the special treatment agents mentioned, whose envisaged application by introducing into the actual treatment fleet, e.g. in household or industrial washing machines, the following properties are guaranteed, which are essential for the perfect usability of the fleece bags are:

-- High tightness in dry condition with regard to the

Bag contents, i.e. practically impermeable to dust, -- Extensive permeability for liquid media in both directions, while retaining undissolved substances, -- Good resistance to mechanical stress

during the dyeing process, -- Little or no staining by the dyes used Dyes., as well as -- Easy handling when packing the dye or of the dye chemicals, e.g. sealing all around by a weld seam.

Experiments with the same aim, which were undertaken to test the bags made on the basis of DE-PS 1 130 547 with waterproof but water-soluble films, e.g. made of gelatin or polyvinyl alcohol, for dust-proof packaging, have shown, however, that in the case of the use of such bags, now filled with dye, for

Exhaust dyeing cannot avoid spotty dyeing because

Even after the covering of the still
undissolved dye in direct contact with the dyed goods
On the other hand, the packaging according to the present
Innovation only dissolved dye will escape, which
due to the movement of the application water, e.g. in a
Washing machine, immediately evenly distributed and in this
state comes into effect.

Bag-like containers of a similar type, but made of

water-insoluble, yet water-permeable material of
fibrous structure., were probably already
several times for the packaging of washing, fabric softener or
Bleaching agents are recommended. Special attention has
One should always consider the conditions and the time of

release of the active substances from the sealed bag into the treatment liquid. Provided that .); the closure of such a package is designed in such a way that
that it can be activated either by a simple mechanical '

Process, e.g. bursting, eliminating or resulting in

a water-sensitive bond can be quickly removed under the influence of the '; aqueous liquor (EP-OS 0 011 989),
then the contents of the bag will be almost instantly j>

released and accordingly irregular ^

distributed with the goods in a first contact. Since j therefore a delay of such an abrupt

As the process sometimes proves to be useful, liquid-permeable bags have been developed which remain closed during use,
Meanwhile, the release of the active substance via a J

special adjustment of the bag material in relation to the * pore diameter controlled (EP-OS 0 163 417) or via -

the permeability of the shell for liquids
is regulated by a temporary protective cover, which
Depending on the treatment temperature,

Dissolving can be eliminated (EP-PS 0 018 678). »

-j The previous principle was also used in the case of several J

use of packaging forms with separate compartments;

made which are intended for the gradual use of agents of different efficiency one after the other, at different time intervals or at different temperature ranges, which is achieved by varying the criteria for opening the individual storage chambers independently of one another (EP-OS 0 236 136) or with the aid of special equipment of the relevant compartments with walls or partitions of the packaging material that obey different flow parameters (US-FS 4 410 441).

All of these modifications for bag-like packaging known from the state of the art are tailored exclusively for the use of washing, rinsing or bleaching agents, where it is irrelevant with regard to the treatment result whether there is direct contact with the goods being treated or not, or whether the respective amount of the active substance is made available all at once, in portions or continuously. Therefore, no direct significance can be derived from the previously discussed proposals for packaging forms adapted to specific conditions with regard to a secure transfer of the same to dyes, the use of which gives rise to a completely different problem due to the risk of unevenness in the product image.

The use of dyes and/or chemicals packaged in accordance with the present innovation for the intended purpose, i.e. exhaust dyeing, is carried out as described below:

The packaging contains - based on a specific dye recipe - a specified amount of the selected treatment agent. In order to achieve a specified color depth, for example in the case of dosing dyes, the number of packaging units used is

decisive. For example, you can pack just enough dye so that one packaging unit produces a light color, two to three of them a medium color, and four or more bags a deep (dark) color. 5

Dye mixtures based on existing trends can also be packaged accordingly to achieve fashionable nuances.

The packaging units are used either by placing the desired number of such bags in hot water and thus dissolving their contents. The resulting solution is then further processed together with the goods to be treated as usual.

Or better still, the required number of packaging units, based on the color tone, is added directly to the mixture of the material to be treated and the application water, for example in a drum washing machine, and the dyeing process is started there under the conditions specified by the system's program, whereby surprisingly even dyeing is obtained.

As far as the subject of the innovation is concerned, it could not have been predicted from the knowledge of the above-mentioned publications that stain-free dyes could be achieved. Although undissolved dye may be retained by the bag-like packaging, the packaging containing the dye, when used according to the latter method, is in direct contact with the item being treated and it was therefore to be feared that in this situation a local darker color could arise at the point where the still concentrated dye solution emerges. Practical tests have, however, refuted this assumption.

Chemicals required for dyeing or other treatment (e.g. alkali when using reactive dyes) are usually used in the same packaging units.
5

The packaging process is best automated by applying a certain amount of dye and/or chemical to a suitable nonwoven tape, covering it with a second nonwoven tape, sealing it on all sides at the edges and cutting it off, preferably creating a rectangular bag. Of course, other packaging options are also possible, e.g. by folding a single nonwoven tape piece by piece and then sealing it at the three open edges.

The welding process itself is well known to the expert and can be carried out perfectly and tightly due to the thermoplasticity of the fiber material of the fleece.

Suitable nonwoven materials that also meet the requirements in terms of dustproofness are available on the market.

The step-by-step production of the nonwoven bags according to the innovation is shown schematically in the drawings below (Fig. 1-7) in section and in plan view. The reference symbols used for the parts shown therein or the individual packaging steps have the following meaning:

A = fleece tape

B = Packaged goods

C = Weld seam

D = cut

I= The packaged goods are weighed onto the fleece belt

II - The fleece tape is folded over

III = The fleece tape is welded at C and at D

cut

IV = The ferticiy fleece bag

Claims (5)

"h6 Protection claims 1. Ready-to-use packaging for water-soluble dyes and/or chemicals in a solid state, essentially consisting of at least two layers of a water-permeable, solidified nonwoven fabric made of synthetic thermoplastic fibers in the form of a bag with the edges tightly welded on all sides, in which the packaged goods are located. 2. Packaging according to claim 1, characterized in that the nonwoven fabric consists of polyester fibers. 3. Packaging according to claim 1, characterized in that the nonwoven fabric consists of polyamide fibers. 4. Packaging according to claim 1, characterized in that the nonwoven fabric consists of polypropylene fibers. 5. Packaging according to at least one of claims 1 to 4, characterized in that it contains - already aligned to a specific dyeing recipe - portioned amounts of dyes and/or chemicals.