DE1239059B - Cover for sanitary napkins - Google Patents

Description

Sanitary napkin wrapper The invention relates to use a non-woven fabric as a cover for sanitary napkins.

There are covers for sanitary napkins are known in which a non-woven Fabric is used; In this case, however, a reinforcement of the material was always provided, a sufficient wet strength, especially against transverse loads and a Ensure rubbing resistance in the wet.

For example, a cover has been proposed that consists of one layer consists of unspun and disordered fibers, whereby to connect the fibers with each other a binder is provided, either on the individual fibers or in strips was applied criss-cross to the surface of the fiber layer. At this However, reinforcement strips are provided in the envelope, at least in the area the shell are arranged at the edges of the core enclosed by the shell is present. This was especially done when the casings were made of one material that is lighter than around 45 g / m2 because it is such a light material for a variety of reasons, especially because of its low strength, good Permeability, etc., desirable.

Even with those using after the aforementioned cover became known The sheaths proposed for non-woven fiber material have always been reinforcement of the fiber material through a fabric incorporated into the covering material or through a fabric in terms of reinforcement and holding the fibers together equivalent, printed, cohesive, preferably made of plastic Network provided.

In all these cases that have become known, the intended one brings Reinforcement not only entails additional material and labor costs, Instead, it is important to remember that the reinforcement comes from the The soft layer formed by the nonwoven fibers is pressed through and is therefore uncomfortable to wear especially rubs on the skin and can therefore lead to inflammation and the like.

The object of the invention is to create a cover for sanitary napkins, using non-woven fiber material in the simplest and most economical way Can be manufactured in a manner that is pleasantly soft and skin-friendly as well as thin and at the same time has the required, aforementioned wet strength properties.

The invention consists in the use of a non-woven fabric overlap from one path- of and intersecting fibers made with a dispersion impregnated with a water-resistant synthetic resin, as unreinforced, not with additional fabric inlays in or on the fabric cover for sanitary napkins, whereby the total weight of the fiber is between 11.5 to 31 g / m2 and the impregnation between 8 and 25 percent by weight, based on the total weight of the fibrous material, amounts to. In this way, as has been found by the invention, the hitherto Repeatedly proposed reinforcement of non-woven fiber material with fabric inserts or these equivalent, for example printed plastic nets, are omitted. This makes a thin, absorbent, permeable, non-woven cover taller Wet strength and increased frictional resistance in the wet created at the same time is skin-friendly in an excellent way and is simple and economical can be produced.

The increased wet strength and the increased frictional resistance in the wet are obtained in that the connecting surface of the fibers is increased and the The length of the free fiber sheet is reduced. This can be achieved by that the web from which the casing is made with an adhesive solution or dispersion is impregnated or soaked in a relatively low concentration, so that the individual adhesive particles or binder particles over the entire web are evenly distributed. These adhesive particles are more dense to each other along the entire length of the fibers and form a maximum number of connection points between these fibers. While now the friction resistance in the wet with the Increase in the number of connection points and the amount of that stored in the railway Increased binder, the softness or the grip of the shell decreases undesirable level if the amount of binder exceeds certain maximum values is increased. On the other hand, if there is not enough binder in the web, then there are so few binding sites that the desired wet strength is not achieved is obtained, so that there is also a certain minimum limit for the binder content gives. This is of particular importance on the edges of the sanitary napkins. These Sanitary napkins are usually rectangular in cross-section, so that the nonwoven cover extends over four corners of the bandage. Each of these corners now forms a point around which the wear forces concentrate and destroy the cohesion of the shell there.

For many reasons it is desirable that the casing be as thin as possible is thinner mainly because of its excellent moisture permeability Lanes. The thickness and weight of the envelope must also be measured in such a way that that there is acceptable handiness and flexibility. When the weight Increased beyond certain limits is the amount of binder that is on a certain area of the casing must be applied in order to achieve the desired wet strength to produce so large that the handiness and flexibility below acceptable limits is decreased.

The inventive, non-woven cover can be made of a web or are made from webs whose fibers lie on top of each other and cross each other, as she z. B. are generated by a card, the fibers predominantly in oriented in one direction. However, the path can also be formed on a wet path or deposited in an air stream with the fibers not oriented, or it can be a layer of an oriented path with its major axes inclined to one other oriented tracks can be laid, or these tracks can be individually or mutually exclusive be layered. The web can be made from fibers of bleached absorbent cotton or from rayon fibers made from viscose, acetate or copper ammonium rayon or mixtures of these rayons. The web can be completely made up of any of these Fabrics or from various mixtures of these rayons with each other or with the bleached absorbent cotton.

The web for the sanitary napkin covers is made of the aforementioned nonwoven fabric produced in that this is impregnated with a synthetic resin that is in a Dispersion of relatively low concentration is located, so that a measured Amount of binder is incorporated into the web or applied to the web. To the Water-resistant synthetic resins based on polyvinyl acetate are suitable for use, Polyvinyl chloride, butadiene acrylonitrile, polystyrene or acrylic resins and copolymers any of these substances. The web is then dried and the solvent under Use of an appropriate device, e.g. B. a textile drying chamber, a hot air chamber, etc. removed.

After drying, the web is cooled and wrapped and then cut to the desired length and width.

For the reasons mentioned above, the weight of the finished goods should be between 11.5 to 31 g / m2, and the embedded binder should not be less than 80/0 of the weight of the finished product in order to generate adequate strength, but should not be more than 25 01o of the weight of the goods, so that an acceptable Softness and grip is maintained.

Before or after impregnation with the binding agent, the casing in a known manner with a deodorant or disinfectant, e.g. B. a cationic quaternary ammonium chloride. The disinfectant shall be deposited on the hull in such a great amount that it is during retains its effectiveness in the bandage for a certain period of time. When applying the quaternary compound mentioned as a disinfectant must be the type and amount The synthetic resin used must be taken into account as most of the used as a binder Suitable synthetic resins are somewhat anionic and strive to be effective the quaternary connection over a certain period of time. Of course if a synthetic resin is to be selected that is compatible with the quaternary compound, see above that a permanent disinfecting or deodorizing effect remains.

A sanitary napkin is produced by using the described cover wrapped around an absorbent core or insert pad. This core can consist of loose cellulose, which is surrounded by an inner layer of absorbent, semi-absorbent or semi-repellent paper, or the core can be any of a number of Layers of absorbent tissue paper with or without a repulsive boundary layer on the back of the pillow and / or repellent tissue paper boundary layers along the Sides of the core exist. In either case, the entire core or the whole will be Cushions wrapped with a single layer of the described envelope, their edges overlap slightly on one side of the pillow. The core is in cross section roughly rectangular, but also so pliable that it adapts itself when worn. It many types of cores and various absorbent materials can be used, which together with the envelope according to the invention result in a sanitary napkin that has a has increased wet strength and increased frictional resistance when wet.

In addition to these advantages of the bandage, there is the further advantage of low manufacturing costs, since the new impregnation process, compared to the Printing process for applying the binder in patterns is only a very simple one Equipment required.

Because the same amounts of fibers and binders are used in both processes come into use, savings will be made in both set-up costs and also achieved in manufacturing costs.

Claims (1)

Claim: Use of a non-woven fabric from a web overlapping and intersecting fibers coated with a dispersion of a water-resistant Synthetic resin are impregnated, as unreinforced, not with additional fabric inserts in the or on the fabric provided cover for sanitary napkins, whereby the total weight of the fiber fabric between 11.5 to 31 im2 and the impregnation between 8 and 25 percent by weight, based on the total weight of the fiber. Documents considered: German Patent No. 844789; Swiss Patent No. 273 537; French Patent No. 836 894; U.S. Patents Nos. 2,330,314, 2,542,909, 2,617,744, 2625161.