WO2001068020A1

WO2001068020A1 - Method for production of a dressing material and dressing material

Info

Publication number: WO2001068020A1
Application number: PCT/EP2001/001070
Authority: WO
Inventors: Stefan Arnold
Original assignee: Paul Hartmann Ag
Priority date: 2000-03-15
Filing date: 2001-02-01
Publication date: 2001-09-20
Also published as: DE10012582A1; AU4057101A; DE10012582C2

Abstract

The invention relates to a method for the production of a dressing material, in particular, a plaster (30), a fixing-, compression or support binding, with a hot-melt adhesive coating, whereby, on at least one side of a longitudinally extending support (16), made from a porous flat material strip, a hot-melt adhesive (34) is, at least partially applied by means of a application head (14). The support is subsequently cut longitudinally or transversely to give individual dressing material sections. According to the invention, the hot-melt adhesive is applied in strips along the longitudinal direction of the support (16) and during the coating the application head (14) carries out an oscillating movement relative to the support (16), lending the hot-melt adhesive stripes a wave-like form.

Description

Title: Method of making a dressing material and dressing material

description

The invention relates to a method for producing a dressing material and a self-adhesive dressing material, in particular a plaster, a fixation, compression or support bandage, the dressing material having a hot melt adhesive coating (hot melt adhesive) in which on at least one side of a porous sheet of flat material existing, longitudinally extending carrier, a hot melt adhesive is applied at least partially by means of an application head and the carrier is then cut into individual dressing material sections in the longitudinal and / or transverse direction. Hot melt adhesive should be understood here to mean pressure sensitive hot melt adhesive. In the following, instead of the general term, one speaks of a plaster.

Patches currently available on the market (with solvent adhesive) are packaged on the one hand as rolls, the adhesive in the rolled-up state being in contact with the plaster upper side of the winding underneath, and on the other hand in the form of conventional plaster strips with wound dressings, which protect the surface of the adhesive thereon Protective strips made of silicone paper are arranged, which are peeled off before use. The use of solvent-based adhesives has the disadvantage that after the adhesive has been applied, the solvent has to be evaporated from it and recovered. In addition, there are health concerns with solvent-based adhesives due to secondary evaporation. Patches with hot melt adhesive application are e.g. B. is known from EP 0 826 380 A2. Since the hotmelt adhesive itself is not breathable, no full-surface adhesive application is generally provided, but the hotmelt adhesive is applied in areas. The order can e.g. B. strip-shaped in the longitudinal direction of the patch, but also in the form of transverse strips, punctiform, grid-shaped or in the form of a porous application, so that breathability is ensured. For example, EP 0 689 408 B1 discloses a grid-shaped adhesive application. In both cases, the pressure sensitive adhesive is applied by means of a printing process. The printing technology has the following disadvantages: The gravure printing process is complex and relatively complicated, since there are problems in transferring the adhesive from the engraving onto the carrier. The screen printing process only enables a dome-shaped adhesive application, which has the disadvantage of having only a slight contact with the skin. The domes only come into contact with the skin surface with their outer curvature, so that only a small adhesive surface is achieved in relation to the amount of adhesive.

From G 83 25 342.4 a self-adhesive plaster is known, in which the adhesive application is designed as straight-line adhesive strips which run in the longitudinal direction of the plaster. For reasons of manufacturing precision, it cannot be prevented that the separating cut is made through the web material over a longer section outside the adhesive webs. As a result, when cutting through uncoated areas, fibers tend to separate from the carrier and wrap around the pinch knife and block it in a very short time. The cutting edges already fray during the manufacture of the plasters and the plasters warp. In addition, it turns out to be problematic that, due to the fraying or fraying, the plaster is unsightly on the one hand, and its shape is changed on the other. Furthermore, there is the problem that dust is generated in particular when the plaster is pulled off a roll or generally when fraying or unraveling edge regions, which makes the handling and use of the plaster in the medical field in the vicinity of open wounds appear problematic.

It is therefore an object of the invention to provide a method for producing a plaster with a hot-melt adhesive coating and a plaster itself in which fraying and unraveling of the carrier are reliably prevented and which at the same time is simple to produce in terms of process technology.

The invention solves this problem by a method for producing a plaster, in which the hot-melt adhesive is applied in the form of a strip in the longitudinal direction of the carrier and the application head performs an oscillatory relative movement with respect to the carrier during the coating, as a result of which the longitudinal adhesive strips have a wave shape. That is, the application head or the carrier is moved or vibrated relative to the other part.

Such a plaster, which can be used both as a fixing plaster and as a plaster strip and the carrier material of which can consist of porous, air-permeable material, in particular of fibrous material, for example fabric, offers the advantage of a certain permeability to air and water vapor in the uncoated areas, ie in areas where there is no hot melt adhesive application. The application of the hot melt adhesive in strips has the advantage over a raster-shaped application of the hot melt adhesive that better ventilation of the skin beneath the patch is possible. The spaces between the hot melt adhesive serve as "air channels", so to speak.

Due to the oscillatory relative movement between the carrier and the application head, the hot melt adhesive is applied in a wave form running in the longitudinal direction of the carrier. That is, the hot-melt adhesive is applied to the carrier in a wave shape in parallel, not overlapping wavy lines. The wave-shaped application has the advantage that a cut lengthways through the plaster is never made completely or over a longer distance in uncoated tissue, but the squeezing knife always intervenes alternately in coated and uncoated areas. This prevents unraveling of the cutting edges and in particular blocking of the crushing knife by loosened fibers. The method according to the present invention can be a contact coating method, as is particularly favorable for applying a hot melt adhesive.

In such a method, the carrier is passed over a coating roller in the area of the application head, the application head releasing hot melt adhesive through corresponding openings (nozzles) and applying this to the carrier.

In order to ensure the oscillatory relative movement between the carrier and the application head, provision can initially be made for the application head to vibrate. Alternatively, the coating roller can be vibrated.

A particularly advantageous solution for realizing the relative movement is to provide an oscillation of the tissue, since this is in contrast to an oscillatory one Movement of the application head and the coating roller only have to move parts with a low weight and therefore no large mass forces arise.

For example, it can be provided that the fabric is passed directly in front of the coating head (application head) over two non-driven wrapping rollers, which perform an oscillatory movement. The movement is achieved by an eccentric drive and crank rods. In order to prevent the vibrations from being transmitted to a machine frame of the coating system and the coating equipment, namely the application head but also the coating roller, a counterweight can be driven by the eccentric shaft of the eccentric, which counteracts a large part of the mass forces.

According to one embodiment, it can be provided that the relative movement takes place at a frequency of approximately 10 Hz. With a coating width of approx. 1000 mm and a machine speed of approx. 30 m / min with which the carrier is transported, this generates an amplitude of approx. 5 mm and a wavelength of approx. 50 mm per hot melt adhesive track or strip. With such a coating, all problems of the assembly are solved and the correctness of the cutting edges is guaranteed. The amplitude can preferably be varied between 2 and 20 mm and the wavelength between 15 and 200 mm. The strips, ie the hot melt adhesive traces, can have a width of preferably 0.5 to 2 mm each, the distance between the individual strips being preferably 0.3 to 3 mm.

Furthermore, the invention comprises dressing material, in particular a plaster, in particular produced by the method according to the invention, with a web section made of a porous material which is on at least one side is partially coated with hot melt adhesive, wherein the hot melt adhesive is preferably arranged in the transverse or longitudinal direction of the web section in undulating adhesive traces. The adhesive traces or strips formed by the earth therefore run essentially parallel to one another and preferably do not touch one another. The hot melt adhesive application on the finished plaster can run in the longitudinal or transverse direction of the path section of the plaster, but the lines of hot melt adhesive always run in the machine longitudinal direction, i.e. in the direction of the carrier from which the individual plasters consisting of the path section with the respective hot melt adhesive application by longitudinal or Cross sections were assembled.

In addition to the advantages described, such a strip application has advantages with regard to the detachability of the plaster after use from the skin.

Patches are usually removed from the skin by removing one corner of the patch and pulling it off in one go. Depending on the adhesive strength of the hot melt adhesive, this detachment is more or less painful. Due to the wavy coating, d. H. the wave-shaped course of the hot-melt adhesive strips, the plaster is removed particularly gently, since the hot-melt adhesive application has no sharp changes in direction.

The plaster can in particular have wavy strips of hot melt adhesive with an amplitude of 2 to 20 mm, in particular 5 mm, and a wavelength of 15 mm to 200 mm, in particular approximately 50 mm.

Further advantages and features of the invention result from the other application documents. In the following, an embodiment of the invention will be illustrated with reference to a drawing.

Show:

Figure 1 is a schematic representation of the coating process;

FIG. 2: a plaster according to the invention;

FIG. 3: a plaster roll on which the carrier material cut in the longitudinal direction, which is made up into individual plasters, is wound up;

Figures two plaster strips and 4 a, b

Figure 5: another patch.

FIG. 1 shows a coating system 10 which comprises a coating roller 12 and an application or coating head 14. The carrier 16, which consists of air-permeable fabric, is guided over the coating roller 12, the carrier 16 being coated at the same time by means of hot melt adhesive emerging from the application head 14. The coating process is a contact coating. Immediately in front of the coating roller are two wrapping rollers 18 and 20, which are not driven.

The two wrapping rollers 18 and 20 are set into an oscillating movement by means of an eccentric which is connected to the wrapping rollers 18, 20 via crank rods (not shown) and the oscillation is opened the carrier 16, which consists of tissue, transferred. The oscillation of the carrier 16 continues in the latter, so that an oscillating relative movement occurs between the carrier 16 and the application head 14. That is, the carrier 16 swings back and forth in the horizontal direction in front of the application head 14.

The hot melt adhesive that emerges from the application head 14 is thereby applied to the carrier 16 in a wave shape. The hot melt adhesive is applied through several openings in the application head 14, so that a strip-shaped application is produced, the strips being arranged parallel to one another. The hotmelt adhesive lines do not overlap or touch.

In order to prevent the oscillating movement from being transmitted to the coating equipment, that is to say the coating roller 12 or the application head 14, or to the rest of the machine frame, the eccentric shaft simultaneously drives a counterweight, not shown, which compensates for the mass forces which arise.

After coating, the carrier 16 is cut into individual plasters in the longitudinal and / or transverse direction. The cut is made by the waves, so that at least a single wave line is cut. As a result, the crushing knife is always cut alternately in coated and non-coated carrier material 16, which avoids fraying of the edge region with the known disadvantages with regard to the plaster shape, dust formation and blocking of the squeezing knife by fibers.

The oscillation frequency is approximately 10 Hz, which at a feed speed of the carrier 16 of approximately 30 m / min. and a carrier width of approximately 1000 mm leads to wavy strips with an amplitude of approximately 5 mm and a wavelength of approximately 50 mm. φ

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The plasters 30 according to FIGS. 4a and 4b differ in their amplitude and in their wavelength of the wavy hot-melt adhesive strips.

FIG. 5 shows a plaster with a continuous wound covering 44, which also has perforations 46. The longitudinal direction of the carrier material 16 from which the plaster 30 was cut is also shown by an arrow. The wound dressing 44 extends over the entire length of the plaster 30. The adhesive track or line here has a width of approximately 1 mm, just like the free spaces between the adhesive tracks have a width of approximately 0.5 mm.

Claims

claims

1. A method for producing a dressing material, in particular a plaster (30), a fixation, compression or support bandage, with a hot-melt adhesive coating (34), wherein on at least one side of a carrier consisting of a porous sheet of material extends in the longitudinal direction and extends Hot melt adhesive (34) at least partially by means of an application head

(14) is applied and the carrier (16) is then cut into individual dressing material sections in the longitudinal and / or transverse direction, characterized in that the hot-melt adhesive (34) is applied in strips in the longitudinal direction of the carrier (16) and the application head (14) during the Coating with respect to the carrier (16) performs an oscillatory relative movement, as a result of which the longitudinal adhesive strips of hot melt are given a wave shape.

2. The method according to claim 1, characterized in that the carrier (16) in the region of the application head

(14) is guided over a coating roller (12).

3. The method according to claim 1 or 2, characterized in that the relative movement is achieved by an oscillatory movement of the application head (14).

4. The method according to one or more of the preceding claims, characterized in that the relative movement is achieved by an oscillatory movement of the coating roller (12).

5. The method according to one or more of the preceding claims, characterized in that the relative movement is achieved by an oscillatory movement of the carrier (16).

6. The method according to one or more of the preceding claims, characterized in that the carrier (16) in front of the application head (14) is guided over two oscillating wrapping rollers (18, 20).

7. The method according to claim 6, characterized in that the wrapping rollers (18, 20) are set into an oscillatory movement by means of an eccentric arrangement.

8. The method according to claim 7, characterized in that the transmission of the vibrations to a machine frame and the application head (14) and the coating roller (12) is prevented by the drive of a counterweight by the eccentric arrangement.

9. The method according to one or more of the preceding claims, characterized in that the relative movement takes place at a frequency of 2-25 Hz, in particular 8-15 Hz.

10. The method according to one or more of the preceding claims, characterized in that the carrier (16) is transported at a speed of 15-70 m / min, in particular 20-60 m / min per minute.

11. The method according to one or more of the preceding claims, characterized in that that it is a contact coating process.

12. dressing material, in particular plaster (30), fixation, compression or support bandage, in particular produced by a method according to one or more of the preceding claims, with a web section (42) consisting of a porous material and one on at least one side of the web section (42) applied partial hot-melt adhesive coating (34), characterized in that the hot-melt adhesive (34) is arranged in undulating adhesive traces.

13. dressing material according to claim 12, characterized in that the adhesive traces do not touch each other and are substantially equidistant from each other.

14. Dressing material according to claim 12 or 13, characterized in that the wavy adhesive traces of the hot melt adhesive (34) have an amplitude of 2 to 20 mm and a wavelength of 15 to 200 mm.

15. dressing material according to claim 14, characterized in that the wavy adhesive traces have an amplitude of 3 - 10 mm and a wavelength of about 30 - 80 mm.