Disposable absorbent underpants.

p0001The present invention relates to absorbent disposable underpants, especially those briefs that are fully assembled to be used, for example as a training pants for babies or underpants for Inkontinenzler.

p0002Disposable absorbent pants in the form of fully assembled underpants which have elastic means in the waistband and leg opening pair, are already known from Japanese Unexamined Patent Publication no. 58-11507. The known underpants has a laterally elongated rectangular water-permeable topsheet, which is dimensioned so that it can form the front and rear portion, a water-impermeable backsheet, which is identical in shape and dimension with the topsheet, and an absorbent core, enclosed between the two layers, wherein the central region in the middle between the laterally opposite ends of the layers is left as a free space to combine the absorbent core with the front and rear areas. elastic members are further provided which are adhered along the upper end of the rear layer, to bond the elastic members with a waist band; the elastic part is similarly attached to the backsheet along the other end to be connected to the respective leg openings.

p0003The main body produced in this manner is folded back along the center line of this free space, and then, connected to the front and rear region along the side edges, which are opposite the free space to each other, wherein the end of the forward and rearward portion along the lower end of the central portion, between the both lateral edges and the other formed by the folded-back side edge clearance is defined, are interconnected to complete in this manner, the fully assembled underpants.

p0004Such known underpants are certainly advantageous in that the production is simplified, but involve various disadvantages in itself, for example, that the function of absorbing is inadequate, since the components are concentrated in the front and rear area which are to be joined in the crotch area. If these components are broken or not connected, there is a loss of the desired function as underpants and leakage occurs, because the crotch region is subjected during the movement of the legs of the wearer highest tensile forces. These components give the wearer feel uncomfortable intolerance.

p0005In addition, the front and rear portion are dimensioned identically, so that the hips corresponding area comes under tension (it is close), while the area of ​​the stomach due to the rigidity of the components of the underpants is easy, in particular because of the absorbent core and the mold the human body. (Infant).

p0006Further, in the panties by the prior art, the elastic members between the topsheet and the backsheet are enclosed and extend substantially across the width of the core or over the length thereof, so that the elastic pieces, in particular those with the respective leg-openings are connected, which are important in order to prevent leakage of excretion in the crotch region, hardly have portions that are able to maintain the elastic function, without any antagonistic effect on the rigidity, which is held to the core, with the result that the sealing effect is insufficient at the leg openings to prevent leakage. In addition, the interconnected in this manner sections with respect to the remaining portions are rigid, when the fixing is done by welding, so that the wearer feels pain or even due to the contact of the skin with the connected portions may be injured if not special care is taken with this type of compound.

p0007As underpants in which the Hüftbandabschnitte which are respectively associated with the front and rear areas, are included in the ring-shaped band, it is impossible, an overlapping width of the lateral, opposite edges of the front and rear portions and an appropriate tightness of the adjacent regions set including the waistband, which contrast in disposable diapers of open-type is possible in which the tape fastener Hüftbandabschnitte are connected by only during the actual use of the diaper to each other. A further disadvantage is to be noted that in the area adjacent to the bottom of the Hüftbands in the front portion folds are formed which occur due to the loose seat when the briefs are worn, since the components of the underpants are more rigid than those of the disposable diaper and because the bellies of babies generally protrude forward.

p0008The present invention has for its object to improve disposable underpants mentioned type such that the above-mentioned disadvantages can be avoided by simple measures.

p0009The object is remote from the present invention in a disposable absorbent underpants comprising a main body consisting of a water-permeable, coming in contact with the wearer's skin top sheet, one of the main side of the upper layer, water-impermeable backsheet and an enclosed between these two sheets absorbent core solved in that elastic members are provided to form elastic folds in a respective waistband and of corresponding side in the, in the crotch region opposed portions cut leg openings, said leg openings associated elastic members, the cutout portions surround, and wherein the main body is produced by stacking folds of the body along the body of a splitting in two vertically adjacent halves center line and then connecting the two superposed halves along the lateral, mutually opposing side edges of the folded main body. Underpants, which are formed in the form of fully assembled underpants invention can therefore particularly suitable as a practice or game pants for babies achieve improvements not only in terms of appearance and their appearance during wear but also in terms of their seat to the wearer's body and are and underpants for Inkontinenzler or weak old man.

p0010One of the main features of the invention constructed according to the underpants is that the cut-out portions that form the respective leg-openings are formed in laterally opposite side portions of the crotch region (as viewed a plan view of the handling of the main body), and that the leg openings in the associated elastic members are incorporated, so that the respective leg-openings are surrounded by the associated elastic members, when the panties is fully assembled. These measures ensure that the leg openings fit perfectly around the leg and prevent any leakage of excreta.

p0011In a preferred embodiment of the present invention, the associated elastic members extend with a predetermined length beyond the opposing side edges of the core, is stiffer than the top sheet and the back sheet and that components due to its material and thickness. As a result of this training, the extensions of the elastic members can freely develop their inherent elasticity substantially from opposite influences of the rigid core, whereby the sealing effect of the leg openings is improved by the wearer's thighs and leakage of secretions in this area can be effectively prevented.

p0012The lines along which the front and rear portions are welded together, formed by grooves, the edges that extend outside of these lines remain free. In this way, coming sections that are cured as a result of the welding process, not directly in contact with the wearer's skin, thereby effectively avoiding that these sections the support cause pain or even cause him injury.

p0013Other important features of the present invention such as that of the rear region is larger in size than the front portion, that the leg openings defining cut-out portions with respect to the vertical center line in the direction of the front region are added, and that in opposite side edges (seen of a processing underpants), folds are formed, which serve as the hem, which in turn are its side edges connected to each other, these features serve to solve the problems that have been identified in connection with the known underpants, such as a problem that the area corresponding to the hip the wearer is exposed to a train, while the area corresponding to the stomach, because of the rigidity of the components and the figure of the wearer is loose. By the features according to the invention the fit is further enhanced. The lateral width of the relevant lower portions of the front and back portions are made larger than the width of the respective waist band portions and the rear portion is itself in the light of the feature that the cut-out portions, the respective leg-openings in the laterally opposite regions of the crotch region in the direction offset of the front part of the underpants, larger dimensions than the front portion.

p0014In this way, the underpants can maintain a good fit around the body, without because of the lots, which raises the disadvantages or inconveniences that the area of ​​the lower abdomen in question is too narrow, in the range below the waistband of the front portion folds and during wear the pants as a whole from slipping, even if the stomach is forward, as is the case generally in babies and the main body of underpants made of relatively rigid components.

p0015Finally, each of the waist band portions of the leg openings associated elastic members are arranged substantially parallel to each other and therefore easily installed in the associated components or underpants, whereby optimal conditions for the mass production of such articles at low cost are provided.

p0016The invention is illustrated by shown in the drawings embodiments. Show it:<ul><li>FIG. 1 is a perspective view of a first embodiment of an inventive underpants,</li><li>Fig. 2 is a front view of the underpants after assembly, </li><li>Fig. 3 is a plan view of a development of the underpants of FIG. 2,</li><li>Fig. 4 is a front view of a second embodiment of a composite underpants according to the invention,</li><li>Fig. 5 is a view of a development of the underpants of FIG. 4, and</li><li>Fig. 6 is an enlarged illustration of a section along the line VI-VI in Figures 2 and 4.</li></ul>

p0017Referring first to Figures 1 through 3. A disposable underpants with absorbent properties comprises a main body 1 with a water-pervious topsheet 2, the allocation of capacity dimensions identical to trained impermeable backsheet 3 and a narrower than these two layers formed absorbent core. 4 The main body 1 further has elastic members 5a, 5b, which form elastic folds in the associated waistband portions, the waistband portions together to form a waistband 10th Further elastic members 6a, 6b and 6c form elastic leg openings pleats in the eleventh

p0018The topsheet 2 comprises a nonwoven fabric having partially heat-sealable fibers, while the back sheet 3 consists of a plastic film or a laminate of such film and a nonwoven fabric. The core 4 has a flocculent pulp or a mat consisting of a mixture of such pulp and superabsorbent polymer particles, which is covered on the top and bottom of the water impermeable layer (not shown). The elastic members 5a, 5b and 5c are made of a urethane foam or a plastic film having an elastic stretchability shows under heat treatment, which are relatively far, for example 10 to 45 mm, while the elastic members 6a and 6b are composed of a plurality of rubber threads , The elastic members 5a and 5b are sandwiched along vertically opposing ends of the topsheet 2 as well as the backsheet 3 in a front portion 7 and a rear region 3 of the underpants along associated waist lines 10a and 10b, namely before the underpants assembled or is folded back. The elastic members 5a, 5b, 6a and 6b, but in particular, the elastic members 6a and 6b preferably extend outward beyond the respective outer edges of the core 4 in the front region 7 and in the rear region 8 by 10 up to 130 mm also, preferably 30 to 110 mm. The most preferred amount is between 50 and 95 mm.

p0019This length is marked with the letter L corresponding to the distance from the corresponding side edge of the core 4 to the inner side edge of recesses 14, along which the welding is performed. These indentations 14 are discussed in more detail below.

p0020In a crotch region, the topsheet 2 and the backsheet 3 at laterally opposite areas are provided with semi-elliptically shaped cutout portions 12, which are offset with respect to a center line X of the main body of the underpants in the direction of the front portion 7 and form the respective leg openings eleventh Therefore, in the main body 1 of the rear portion 8 is larger in size than the front portion 7 are in the front and rear regions 7 and 8, 12, the elastic members 6a and 6b used in addition to vertically mutually opposing ends of the respective cut-out portions, which in itself essentially parallel to the elastic members 5a and 5b extend. In addition to laterally opposed side edges of the two cut-out portions 12, the front and rear portions with elastic members 6c are provided, which extend transversely substantially to the horizontal and which are connected with the associated elastic members 6a and 6b.

p0021These elastic members 6a, 6b and 6c surrounded in this way the associated cut-out portions 12, it is of course also possible, a single resilient member to fasten in a curved line along the contour of the associated cut-out portions 12. However, the illustrated embodiment has, compared with such an elastic item advantages, since the operation of adhering the respective elastic members in the manufacturing process is drastically simplified and thus a high production rate can be achieved.

p0022The front and rear portions 7 and 8 are provided along their laterally opposite side edges with notches 13 in the form of a wide open V which improve the hem or folding the seat donors. The core 4 is adhered between the topsheet 2 and the backsheet 3 in a relatively stationary position, so that it has a central zone of the location with a narrow width in the crotch region 9 and a larger extension in the rear area 8, which extension is larger than in front area. 7

p0023The attachment of the topsheet 2 and the backsheet 3 along its to certain side sections, attaching of the elastic members 5a, 5b, 6b, 6c on the topsheet 2 and / or the back sheet 3 and attaching of the core 4 to the topsheet 2 and / or the back sheet 3 is carried out by hot melt adhesive or by heat welding.

p0024The lateral width W₂ of the front portion 7 and the rear portion 8 along the lower ends is larger than the lateral width W₁ along the waist band portions 10a and 10b at both areas.

p0025Reference is now made to Figures 4 and 5 in which another embodiment of the main body is shown first This main body 1 substantially corresponds to the shape and the structure as has been described in connection with the embodiment according to the figures 1 to 3, with the exception that both the front portion 7 and the rear portion 8 from the crotch region 9 to the each respective waistband portion 10a, 10b are slightly shorter. The elastic members 6a and 6b are made of a relatively wide urethane foam or plastic film which has elastic properties after heat treatment.

p0026As shown in Figures 1, 2 and 4 it can be seen (Fig comp.. 3 and 5), the main body 1 along the center line X is folded back in the vertical direction, so that the topsheet 2 is located inside. a continuous line is welded under pressure then along the opposite side edges of the front portion 7 and the rear area 8, wherein the outermost edges with a suitable width W3, preferably somewhat less than 10 mm wide, not welded. In such a case, in order to improve the weldability, and therefore the welding strength, preferably a plastic film having a niederigeren melting point than that of the topsheet 2 and the backsheet 3 between these two sheets along the welding line, or between the two upper layers, the folds after the come into contact, inserted.