DE102011117775A1 - Method for expanding and/or compressing of human hair during preparation of hair weft, involves connecting hairs by crosswise running seam with adhesive such as cyanoacrylate adhesive - Google Patents

Abstract

The method involves connecting the hairs by a crosswise running seam (1) with adhesive (2) such as cyanoacrylate adhesive. The viscosity of the cyanoacrylate adhesive is set to specific value.

Description

The present invention comprises a method for hair extension and / or hair thickening, which is characterized in that hair is connected to each other by only a transverse seam and additionally cemented with cyanoacrylate at the seam.

Hair extensions are used to make the hair appear longer by foreign real or synthetic hair, while Haarverdichtungen the hair is replenished or filled.

So far, hair extensions and hair consolidations are made by various methods. Strange strands of hair are attached mechanically to the hair using ultrasound, heat or solvents that cause the fasteners to swell.

EP 2 165 614 A2 is to be mentioned as an example.

Another type of hair extensions and hair compaction refers to so-called hair tresses. These are juxtaposed, loose single hairs at the top (opposite to the hair tips) with several seams mechanically or hand-knotted together. This seam strand can then be sewn to the own hair by means of yarn. For this purpose, the own hair is usually braided too close to the back of the head plaits, to which then the thread with needle and thread is attached.

The procedures for hair extension and / or hair thickening in which strand by strand is incorporated into the hair are often very time consuming. In addition, it can be very difficult to incorporate particularly many hairs so that the attachment points are all still covered by the own hair.

The common hair tresses are made by turning over and sewing the hair at the top to achieve a certain durability. By turning the hair but lost up to a few centimeters of hair length. Machine made wefts are also often made with many seams to make them sturdy. This results in a higher weight, which reduces the wearing comfort. Also, the seam line often through the many seams around the 5 mm wide and reached in many manufacturing a thickness of 4 mm, which then protrudes strongly at the back of the head. The seams must be covered very well with the own hairs during the incorporation of such Haartressen, so as not to attract attention. This is particularly difficult if the hair is thin.

The object of the invention is to develop a hair extension and / or -verdichtung, in which the border of a machine-made Haartresse is lighter, thinner and less noticeable.

In the present invention, the hair at the top are assembled easily and without turning with a horizontal seam. The hairs that rise above the seam need not be longer than three millimeters. As a result, the original hair length remains as good as preserved. The seam creates a first strength of the lace, which, however, is not sufficient for use. The necessary strength is then achieved by bonding with cyanoacrylate. Cyanoacrylate polymers have high adhesion. That means they are especially good at sticking. It is preferred cyanoacrylate with a low viscosity, that is, for example, 400 mPa · s, chosen so that the adhesive is very thin. It penetrates due to its thin liquid both in the thread and in the hair interstices. Due to the small gaps of the seam, the special property of the wetting of the adhesive and the deep penetration of the adhesive into the interstices of the hair an extremely strong, stable and durable adhesive bond is created.

This is necessary because hair tresses are exposed to high mechanical demands (for example by combing). The temperature resistance is -40 ° C to + 80 ° C, which everyday temperatures, such. B. solar radiation, is withstood.

Simple cyanoacrylate adhesives are generally considered non-waterproof. Therefore, they are not suitable for the production of hair tresses. Meanwhile, however, there are various cyanoacrylate adhesives, which are also described as waterproof. With these adhesives, permanent contact with water or very high humidity does not dissolve the adhesive. Instead, only a permanent reduction of the adhesive force of the adhesive is caused. For an exemplary adhesive (which may not be mentioned here due to trademark protection), only a 1000-hour treatment with 95% humidity would lead to a reduction of the adhesive force to 40%. In various experiments it was found that the adhesive does not cause any significant damage as a result of the daily use of water, so that it could be said that the lace was damaged.

In the production of the tresses has high curing rates by the only small gap widths between the hair and the thread. The adhesive can be chosen as instant adhesive. This speeds up the manufacturing process. The full functional strength is within a relatively short time reached. The curing process should, however, still be adhered to in order to achieve full media resistance. Typical values are at least 24 hours. To achieve optimal results, the adhesive surfaces should be clean and free of grease.

• • Die Haare am oberen Ende werden bei der Fertigung der Haartresse nicht mehr umgeschlagen. Es reicht ein kleiner Rand von 2–3 mm neben der Naht für eine sichere Befestigung. Hierdurch geht deutlich weniger Haarlänge verloren.
• • Die Kombination aus quer verlaufender Naht und der schmalen und hauchdünnen Schicht aus einem durchsichtigen Cyanacrylatklebstoff ist nicht so dick und auffällig wie die üblichen maschinell hergestellten Tressen mit vielen Nähten.
• • Das Gewicht wird stark reduziert, wodurch sich der Tragekomfort erhöht.
• • Ferner kann die Cyanacrylat-Tresse schneller in das Eigenhaar eingearbeitet werden als bei vielen aufwendigen anderen Verfahren zur Haarverlängerung. Grund hierfür ist, dass nicht Haarsträhne für Haarsträhne befestigt werden muss, sondern nur eine Borte an die Flechtung der Eigenhaare angebracht werden braucht, an der die daran bereits nebeneinander gefassten Haare reihenweise eng übereinander und nebeneinander angebracht sind. Dadurch, dass die Cyanacrylat-Haartresse so dünn und unauffällig ist, können bei diesem Verfahren mehr Haare eingearbeitet werden als bei vielen anderen Methoden.
• • Die Einarbeitung der Cyanacrylat-Haartresse durch Annähen ist eine sehr schonende Methode, da bei diesem Verfahren darauf verzichtet werden kann, das Eigenhaar mit Einwirkungen wie beispielsweise Hitze zu schädigen.

The object of the invention was to produce a hair extension and / or -Verdichtung in which the border of a machine-made Haartresse is lighter, thinner and less noticeable than in the hitherto commercially available, machine-made Haartressen. This and other goals were achieved. The advantages of this invention are summarized below:

• • The hairs at the upper end are no longer turned over during the production of the hair tress. A small margin of 2-3 mm is sufficient next to the seam for secure attachment. As a result, significantly less hair is lost.
• • The combination of transversal stitching and the thin and gauzy layer of a clear cyanoacrylate adhesive is not as thick and eye-catching as the usual machine-made, multi-stitched threads.
• • The weight is greatly reduced, which increases the wearing comfort.
• • Furthermore, the cyanoacrylate teas can be incorporated into the hair more quickly than with many other elaborate procedures for hair extension. Reason for this is that not strand of hair for strand of hair has to be fixed, but only a border needs to be attached to the braiding of the own hairs, where the already juxtaposed hairs in rows closely superimposed and side by side. The fact that the cyanoacrylate hair tress is so thin and inconspicuous, can be incorporated in this process more hair than many other methods.
• • The incorporation of the cyanoacrylate hair tress by sewing is a very gentle method, since this method can be dispensed with the own hair with effects such as heat damage.

An embodiment of the invention is illustrated in the following drawing and will now be described here, see 1 :
A transverse seam ( 1 ) connects hair to each other, these are additionally by cyanoacrylate adhesive ( 2 ) at the seam.

The adhesive is applied with pressure on the seam and on the hairs above (and slightly below) the seam.

One possible way to attach the hair tresses is to braid strands on the back of the hair to small, firm pigtails. The attachment is done for example by sewing on the braids of the own hair by using a circular needle is sewn spiral around the seam and the adhesive layer. It is important to ensure that the hair tress is fixed so that sufficient open hair from the top of the head cover the seam of the top strand of the tress.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 2165614 A2 [0004]

Claims (4)

Method for hair extension and / or compression, characterized in that synthetic and / or real hair, which by a transverse seam ( 1 ), with adhesive ( 2 ) are attached to the seam. A method according to claim 1, characterized in that cyanoacrylate is used as the adhesive. A method according to claim 1 and 2, characterized in that the cyanoacrylate adhesive having a low to medium viscosity (of at most 1000 mPa · s) is selected. A method according to claim 1 and 2, characterized in that cyanoacrylate adhesive is chosen as instant adhesive.

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