DE10054928A1 - Fluid absorbent lower or upper layer manufacturing process involves spraying glue onto lower film and scattering pattern of absorbent agent onto glue with continuously moving mask - Google Patents

Abstract

A breathable film (12) is sprayed (16) with hot glue and an absorption agent (20) is distributed onto the glue with a scattering mask (18). The scattering mask is a continuously circulating belt moving in unison with the film and has openings corresponding with a pattern (22) to which the absorption agent is to be applied onto the film.

Description

The invention relates to a method for producing flu documents / requirements, especially those of Medical records, (burn) wound dressings or pant diapers.

It is known for making medical records like this called superabsorbent to use polyacrylate, which are highly absorbent. He goes with the liquid intake considerable increase in volume from 1 to 50 of the grains of the Absorbent, which often leads to a sticking of the Pad or diaper leads.

With commercial documents, the increase in strength leads to that the superabsorbent often comes into contact with the skin. This brings with it special health hazards have resulted in polymethacrylate in some countries this form is prohibited.

In order to give the superabsorbent a better grip, it has become known to apply it on several layers, which are permeable to liquid while the bottom layer is formed like a film and the resulting moisture does not let through. Although the stabilization of the swollen Superabsorbers improved a bit with this solution. With patients Those who move a lot are still pushed out of the absorbent.

EP-B1-671 154 describes a method for producing a Document known in which a granular, highly absorbent material is stuck on. Even with this solution one can be unequal  moderate distribution of granules can be prevented. The The local process aims to achieve this by implementing rela grains with sharp edges.

Liquid absorbing documents and requirements must be as Disposable items inexpensively and with as little mate as possible rial insert are manufactured.

The invention is therefore based on the object of a method for the production of liquid absorbent documents and To create conditions according to the preamble of claim 1 an inexpensive production allowed, but on the other hand one allows safe use of absorbent without the absorbent comes into contact with the skin.

This object is achieved by claim 1. Advantageous further developments result from the Unteran claims.

The solution according to the invention is characterized by a method from, in a cost-effective and particularly efficient way Absorbent in an even fixation, applied will. The scatter mask according to the invention allows the application supply of the absorbent in a pattern, in particular in a checkerboard pattern or any other pattern. This allows the absorbent to be used without health Use danger, although an even distribution is guaranteed. When swelling, the absorbent can are distributed in the free fields, so that the danger of Pushing through the swollen absorbent excluded is.

In an advantageous embodiment of the invention, foils and Separating layer glued together on the open spaces. at this solution, the absorbent is closed in one field, so that a lateral shift in the  dry condition is safely prevented.

To optimize the absorbency, however, are the free surfaces provided so that the absorbent is in can partially shift this area. With this solution it will expand particularly well and its full extent Develop sorption capacity.

In an advantageous embodiment of the invention, it is featured see an even number of absorbent layers train. According to the invention, the film, cellulose or fleece can be provided with the absorbent pattern. This applies equally to a separating layer, which also is provided with an absorbent pattern. The out direction and fixation between separating layer and film or Pulp or fleece is then made so that it is ever opened ten absorbent fields are offset from each other, so so that the absorbent fields of the interface extend on open areas of the film. By this solution lets there is an even distribution in the underlay both as well as during use.

It goes without saying that, if necessary, further separation layers can be provided with further absorbent fields.

It is understood that the solution according to the invention does not apply a checkerboard pattern is limited. Rather, belie bige suitable patterns, for example honeycomb patterns, pre be seen with a 1: 1 distribution between open spaces and absorbent fields is desired.

In a further preferred embodiment, the absorbers fields slightly smaller than the open spaces, at for example by about 10%. This solution is the end stretching of the absorbent when swelling even better worn.  

The scatter mask according to the invention allows the invention to implement appropriate methods particularly cost-effectively. To Applying the hot glue will make the scatter mask synchronous with the Foil, cellulose, flake or fleece web, but also at the corresponding work step synchronously with the separation layered track, moved so that there is enough time to complete a continuous and undisturbed sprinkling with absorption guarantee medium. The scatter openings follow this Design the spray pattern.

After applying the absorbent and also the cover layer is preferably the base before packaging one Subjected to pressurization. For example, it is possible to let them pass between elastic rollers. This ensures that the absorbent is bes anchored in the hot glue so that there is very little loose waste sorbent granules are present in the base.

According to the invention, the separating layer is in the form of a fleece or cellulose trained whose voids are slightly smaller than that of the through knives of the granular absorbent. This is ensures that the absorbent is not separating layer penetrates and accordingly in the assigned to him its area remains.

The grain size of the absorbent is preferably within a tolerance of about 30% uniform. Combined with the grainy-jagged design, as in the EP-B1-671 154 is described, according to the invention the fleece Also use the material of the separating layer to remove the grains of the To keep absorbent anchored after it tends to even with the appropriate pressure in the fibers of the Interlock nonwoven or cellulose.

In an advantageous embodiment of the method according to the invention The scatter mask is continuously filled with absorbent  fed. A suitable conveyor is provided for this purpose for example using a vibrator or a roller represents that absorbent across the width of the scatter mask is evenly distributed.

If necessary, the distribution can also be made using a scraper edge be evened out.

In a preferred embodiment of the invention, the edge The fields are not sealed with hot glue, but with ultra sound exposure ensured. This solution is suitable especially for the multilayer design of documents. If hot glue is applied in multiple layers, this can lead to the un the desired concentration of hot glue in the edge area.

It is important when ultrasonically sealing the edge area tig to keep it free of hot glue and absorbent. For the production of a discontinuous scatter pattern the scatter mask according to the invention can be modified in such a way that has a cover in the appropriate place that the corresponds to the later edge area, no absorbent brought.

In a preferred embodiment of the solution according to the invention it provided the circumferential length of the scatter mask to the requ length of the documents, pads or pant diapers adapt. Documents with a length of 40 cm, 60 cm and 90 cm. With a circumferential length of the scatter mask of 3.60 m can be provided by appropriate nine, six or four covers for those to be made Border areas achieve the desired spreading behavior.

It is preferred to apply the appropriate hot glue Adjacent to the edge area, but a pre-fixation before this to provide the separating layer or layers. hereby ensures that the desired horizontal offset  the absorbent fields are present.

Further advantages, details and features result from the following description of an embodiment of the Invention based on the drawing.

Show it:

Figure 1 is a schematic view of a method according to the invention, as far as the application of hot glue and absorbent is affected.

FIG. 2 shows a plan view of the film produced according to FIG. 1 with the absorbent applied; and

Fig. 3 is a schematic section through a pad made according to the invention.

With the method according to the invention, a film, cellulose or nonwoven web 12 made of polyethylene is first transported in the direction of arrow 14 to produce a base 10 . Hot glue is applied via a spray head 16 , specifically in a spray pattern 17 which can be better seen in FIG. 2. The spray head 16 has this ver across the width of the film 12 divides nozzles that are controlled alternately while the film 12 is moving in the direction of arrow 14 . The acti vation of a nozzle creates a hot melt field with a substantially square cross-section with rounded corners.

While the hot glue is still sticky, absorption medium 20 is applied to the fields acted upon by the spray head 16 , the application fields 22 , via a scatter mask 18 according to the invention. The scatter mask 18 is formed as a circumferential band, which has a pattern with scatter openings which correspond to the spray application and also the absorption medium to be produced. The scatter mask 18 has a width which also corresponds to the width of the web 12 . In the illustrated embodiment, it is guided on four rollers, one of the rollers 25 being driven and the scatter mask moving the film 12 at the same speed.

In order to ensure a uniform distribution over the width of the scatter mask 18 , a vibrator 24 known per se is seen before. Absorbent is fed from a storage container 26 via a metering screw 28 to a distribution chamber 30 which is closed at its lower end by the vibrator 24 . Switching on the vibrator 24 also switches on the metering screw 28 , a filling level of the distribution chamber 30 being regulated according to the requirements. By switching on the vibrator 24 , the scatter mask 18 is continuously supplied with absorbent.

In a modified embodiment, a scraper edge is provided which introduces excess absorbent into the openings of the scatter mask 18 .

The openings in the scatter mask 18 are dimensioned in such a way that it is ensured that the absorbent only falls on the film 12 at locations which have previously been subjected to hot glue. This ensures that no loose absorbent affects the quality of the base / pad to be produced.

In Fig. 2 it can be seen that the hot glue and the absorbent is carried in a checkerboard pattern on the film 12 . Free fields 22 are somewhat larger than the application fields 22 , so that the absorbent can also expand well.

From Fig. 3, an advantageous embodiment of the method according invention is apparent. A separating layer 34 is provided, which is supplied separately with hot glue and absorbent 20 , also in a checkerboard pattern. For this purpose, the separating layer 34 is also subjected to the application of the system according to FIG. 1.

When the webs 12 and the separating layer 34 are joined together , it is ensured that the application fields 22 are offset from one another. When the absorbent 20 swells, a layer of uniform thickness is formed.

An excess of hot glue 36 is applied on the edge, which temporarily holds the separating layer 34 on the film 12 . By ultra-welding the actual edge areas 38 up to approximately the separating layer 34 , final fixation can be ensured.

It is understood that the solution according to the invention is not limited to the implementation with a separating layer. Much more, it is also easily possible to supply two, three or, for example, even five separating layers each with absorbent. The separating layer 34 is preferably made of poly propyleneylies, as is a cover layer 40 which closes the base 10 at the top.

Claims (15)

1. A process for the production of liquid-absorbent underlays / dressings, in particular wound and burn wound dressings, in which hot glue is sprayed onto an optionally breathable film and absorbent is applied to the hot glue via a scatter mask, and the absorbent is covered with a covering layer, thereby is characterized in that the scatter mask ( 18 ) is guided as a circumferential band, the scattering openings of which are congruent and synchronous with the spray pattern of the absorbent ( 20 ). 2. The method according to claim 1, characterized in that the absorbent ( 20 ) is applied above and below a separating layer ( 34 ). 3. The method according to any one of the preceding claims, characterized in that the absorbent ( 20 ) via hot glue or wax is also applied to a separating layer ( 34 ). 4. The method according to any one of the preceding claims, characterized in that on a separating layer ( 34 ) applied absorbent ( 20 ) with respect to the on the film ( 12 ) applied absorbent ( 20 ) is applied offset. 5. The method according to any one of the preceding claims, characterized in that hot glue is applied to the edge of the base ( 10 ). 6. The method according to any one of the preceding claims, characterized characterized that the application fields for the Absorbent a single edge closure is applied, especially by means of ultrasound, wax or hot glue. 7. The method according to any one of the preceding claims, characterized in that the outer edge closure ( 38 ) for the base ( 10 ) is carried out by means of ultrasound or glue. 8. The method according to any one of the preceding claims, characterized in that the circumferential length of the diffusion mask ( 18 ) is adapted to the respective base or support ( 10 ) and the edge region ( 38 ) of the base ( 10 ) for the application of the absorbent ( 20 ) locks. 9. The method according to claim 7, characterized in that the diffusing mask ( 18 ) has a circumferential length which corresponds to an integer multiple of the length and width of the base and support ( 10 ). 10. The method according to claim 8, characterized in that the diffusing mask ( 18 ) has interchangeable covers, the manufacture of documents ( 10 ) corresponds to the selected integer multiple of the length of the base ( 10 ) and the edge area ( 38 ) the base ( 10 ) of absorbents ( 20 ) free. 11. The method according to any one of the preceding claims, characterized in that a separating layer ( 34 ) in the respective edge areas ( 38 ) of the documents ( 10 ) or pads is also glued or welded. 12. The method according to any one of the preceding claims, characterized in that the step of spraying hot glue / wax takes place before the step of applying absorbent ( 20 ), both for the film ( 12 ) and for the separating layer ( 34 ) or the separating layers. 13. The method according to any one of the preceding claims, characterized in that the film ( 12 ) or the nonwoven made of polyethylene and the separating layer ( 34 ) made of polypropylene nonwoven or cellulose (fluff). 14. The method according to any one of the preceding claims, characterized in that the hot glue is sprayed onto the film ( 12 ) or cellulose or fleece and the separating layer ( 34 ) essentially only at those points at which absorption medium ( 20 ) is later applied or is applied over the entire surface. 15. The method according to any one of the preceding claims, characterized characterized in that as an absorbent a renewable Raw material is used.