IT202000005410A1 - PANNOLINO WITH PANTIE - Google Patents

Description

DESCRIPTION

of the Industrial Invention entitled:

PANNOLINO WITH PANTIE

DESCRIPTION

Technical field of application

The present invention is aimed at the sector of sanitary and hygienic articles and relates to a panty diaper (or a wearable type of pull-on), indifferently for children or adults, to whom? applied, in its waist region, a composite elastic tape, elastically extendable along its longitudinal direction, obtained by a particular process.

The invention derives, as a divisional application, from a previous application filed on 21.03.2019 with the number 102019000004133.

Pre-existing technique

In the field of wearable sanitary articles like panties, diapers are known comprising a central body designed to be arranged in a? Concave? Configuration. around the user's fork area.

Said central body includes the actual absorbent core. In order to allow the diaper to be worn in a stable and comfortable way by the user, said diaper comprises a ring made with an elastic band, associated with said central body, for example by welding, adapted to surround the user's waist.

Such an elastic tape? composite type, made by coupling two external layers of fibrous material, for example TNT, and an intermediate layer of elastic material.

To be truly comfortable for the user, said elastic tape must perform both a structural function, encircling the user's waist and ensuring the necessary degree of wearability, and allowing transpiration, avoiding unwanted maceration of the user's skin. due to local stagnation of humidity.

AND? therefore it is essential that this elastic tape be breathable.

From document US 6994 761 B2? a method is known for forming a breathable elastic tape applicable to a disposable absorbent garment, and therefore to a diaper.

Said method substantially comprises the steps of:

- selecting a first and a second layer of fibrous material;

- selecting an elastic polymeric material for a layer of stretchable material;

- positioning the layer of extensible material between the first and the second layer of material to form a set of layers;

- identify one or more? bond points on the set of layers for their coupling;

- fixing together the first layer, the second layer and the intermediate layer of extensible material by means of ultrasonic joining of the first and second layers into one or more? junction points, in correspondence of which openings are formed which also affect the stretch elastic material so as to create real transpiration holes.

The elastic tape obtained is therefore configured as a trilaminate, where each layer of material that overlaps has the same width with respect to the longitudinal development direction and includes along its entire surface transpiration holes that affect all three superimposed layers.

What about the methods of interlayer coupling from US 6 994 761 B2? known the technique of ultrasonic welding, while techniques known even more? traditional provide for the simple gluing of the layers, which would need for? then of subsequent phases of drilling of the trilaminate cos? obtained.

The current production lines that use the method described above present some difficulties? processes related above all to the coupling and joining phases of the layers.

For example, the ultrasonic junction? characterized disadvantageously by the possibility? of damage to layers with thin thicknesses, or with thin sections, especially for the layers of fibrous material that make up the outer layers of the composite tape

Furthermore, the ultrasonic joint requires a careful study of the welding joint, and in particular in the application in question, of the exact welding point that will have to be done. also have the function of air passage.

Even more? disadvantageously, high quantities are used with the manufacturing processes described above. of elastic material, which instead could be optimized, if better distributed inside the belt.

A further disadvantage consists in the reduced breathability? of the elastic tape obtained, since the elastic material, which occupies the entire width of the strip, is totally impermeable to air and therefore the transpiration function is entrusted only to the holes obtained from the ultrasonic junction points.

Presentation of the invention

It is the object of the invention to make a panty type diaper that ensures maximum wearability, high breathability. and the best comfort for the user, by uniformly encircling the user's waist and increasing the elastic holding force along the free edge of said belt.

These objects are achieved with a panty diaper according to the main independent claim.

Further characteristics according to the invention result from the remaining dependent claim.

The product object of the present invention offers important advantages with respect to products that use traditional production methods for the production of diapers of the panty type.

The panty-type diaper according to the invention allows to achieve the objects listed above.

The panty diaper with a waist band made with a breathable elastic tape is particularly comfortable for the user and at the same time is able to support the weight of the diaper even after hours of use, thanks to the belt effect obtained with the upper edge of the elastic ribbon folded back on itself.

The particular shape of the panty diaper according to the invention advantageously increases the elastic force exerted by the elastic band at its free edge.

In order to double the elastic sealing force, and therefore the tensile strength of the material at the user's waist, said composite elastic tape in fact? partially folded on itself so as to overlap two of said strips of elastic material.

The described process allows the production of a highly breathable composite elastic tape even without the use of ultrasonic welding for its perforation, since? Not ? trilaminate, that is? Not ? composed of three layers of equal width.

The function of perspiration? entrusted directly to the layers of fibrous material that make up the external walls of the composite elastic tape:? the fibrous material already? by itself? breathable, which advantageously is not entirely covered by the airtight elastic material, to ensure this important function. The described procedure creates a breathability? in the non-elasticized areas: the fact of keeping the strips of elastic material spaced apart leaves portions of fibrous material free and suitable for the passage of air.

Furthermore, the strips of elastic material obtained by cutting do not necessarily have to be mechanically separated from each other:? the elongation phase itself in their direction of longitudinal development to thin them and therefore to distance them.

Alternatively, if, for constructional requirements, it is desired to further distance the strips from each other, a mechanical adjustment of the position of the same could be made, for example by means of a system of rollers according to the known technique.

The described process operates continuously, quickly and efficiently, with a considerable increase in the production of the strip and of the final product.

Brief description of the drawings

Further characteristics and advantages of the invention will be more evident in the following, in which a modality is described. preferred embodiment, illustrated by way of non-limiting example, and with the help of the figures where:

Fig. 1 is a schematic representation of a plant which carries out a process for making a composite elastic band to be used for the construction of a panty-type diaper according to the invention;

Fig. 2 is a schematic representation of the composite elastic tape, ideally divided into the various manufacturing phases of the process of Figure 1;

Fig. 3 represents, in a simplified plan view from above, a portion of the composite elastic band of Fig.2;

Figs. 4 and 5 show, in simplified axonometric view, respectively a nappy of the panty type according to the invention, comprising the composite elastic band of Fig.3, and a detail of the nappy itself.

Detailed description of a preferred embodiment of the invention

The steps of the manufacturing process of a composite elastic tape 100 to be used for constricting a panty diaper according to the invention are described below, with reference to the system diagram illustrated in Figure 1.

The procedure essentially comprises the phases of:

- unwinding, from a first reel 7, of a tape 1 of elastic material having a main elongation direction x;

- longitudinal cutting of said strip 1 of elastic material into strips 2 along said direction x;

- tensioning and elongation of said strips 2 of elastic material along said direction x, according to the degree of force preferred or imposed by the regulations;

- unwinding, from a second reel 11, of a first ribbon 10 of fibrous and porous material, for example TNT, over said strips 2;

- unwinding, from a third reel 21, a second ribbon 20 of fibrous and porous material, for example TNT, under said strips 2;

- coupling of said stretched, elastically elongated and spaced apart strips 2 of elastic material with said first 10 and second 20 ribbon of fibrous and porous material kept in an undeformed state, to produce a composite elastic material shaped like a ribbon 100, substantially having the width of said tapes 10, 20 in TNT.

In order to carry out said coupling, said method comprises, in the preferred variant illustrated, the step of spraying glue 3 on the faces 10 ?, 20? of said first 10 and second 20 webs of fibrous and porous material facing towards said elongated strips 2 before being arranged above and below them.

Said glue 3 could be sprayed on the whole surface of the faces 10 ?, 20 ?, or, more? advantageously, it could be sprayed locally only along the portions of ribbon of fibrous and porous material which will correspond, in contact, with the strips 2 of elastic material.

Alternatively, the glue could be sprayed directly on the faces of said stretched, elastically elongated and spaced strips 2, before being coupled with said first and second layers of fibrous and porous material. In this way, there would be an advantageous saving on the quantity of glue used.

To increase said coupling between the layers, or alternatively to the above-mentioned glue spraying step 3, said process comprises the step of passing said composite elastic material shaped like a tape 100 between heat-sealing rollers 4.

The design of this heat seal can? be of various types and decorations to meet the demands of the market on the finished product that will go? then to realize, or the diaper.

AND? clear that in alternative variants more? simplified, the coupling of the layers can? also take place by gluing only or only by hot welding with heat-sealing rollers.

Figure 2 specifically illustrates the steps of the procedure with particular attention to what? that happens to the elastic material, identifying four process zones:

- a zone A for longitudinal cutting into strips 2 of the band of elastic material 1;

- a zone B for tensioning and elongating said strips 2;

- an overlapping area C of said strips 2 with the two ribbons 10, 20 of fibrous and porous material;

- a zone D for welding the layers to obtain the composite elastic band 100.

How ? evident from the diagram of Figure 2, the step of tensioning and elongating the strips 2 of elastic material along said direction x automatically causes their thinning and spacing.

At the moment of the coupling step with the ribbons 10, 20 of fibrous material, said strips 2 are detached from each other by a suitably defined distance d.

By way of example only, said strips 2 of elastic material can be cut with a width comprised between 5mm and 100mm, and the distance d left between said strips 2 of elastic material when stretched can be cut. have a measurement between 5mm and 60mm. After gluing and / or welding, the composite elastic tape 100 appears as an alternation, in the direction transversal to the x direction, of elastic strips 2 of composite material and bands 8 of only superimposed porous and transpiring fibrous material (Figure 3 ).

The passage of air takes place precisely through said bands 8, which is essential for making the tape 100 breathable and guaranteeing maximum comfort for the diaper on which it will go. fixed.

When the elastic strips 2 are released, the composite elastic tape 100 retracts and curls in order to be able to stretch again in use. With reference to Figure 4,? illustrated a diaper 5 comprising an absorbent central body 6 and a composite elastic band 100 closed on itself in a loop and fixed, along a first edge 100? to said absorbent central body 6.

Said composite elastic tape 100 closed in a loop? adapted to surround the waist of the user, be it a child or an adult, so as to make said diaper 5 wearable like a panty.

With particular reference to Figure 5,? illustrated a detail of a second freeboard 100 ?? of said composite elastic tape 100, distal to the absorbent central body 6 and substantially acting as a belt zone.

As said above, in order to double the elastic sealing force, and therefore the tensile strength of the material at the user's waist, said composite elastic band 100? partially folded on itself so as to overlap two of said strips 2 of elastic material.

The fixing of said second edge 100 ?? in the configuration folded back on itself it again takes place by means of a heat sealing step, before the ring closure and the application of the tape 100 to the absorbent central body 6 of the diaper 5.

Claims (2)

CLAIMS 1. Panty diaper (5) comprising: - an absorbent central body (6); - a composite elastic band (100) made by a process comprising the steps of: - providing a web (1) of elastic material having a main elongation direction (x); - providing a first (10) and a second (20) web of fibrous and porous material; - cutting said tape (1) of elastic material into strips (2) along said direction (x); - tensioning said strips (2) of elastic material along said direction (x) so as to elastically stretch and space them; - arranging said first (10) and said second (20) web of fibrous and porous material respectively above and below said tensioned, elastically elongated and spaced apart strips (2); - fixing said strips (2) while they are stretched, elastically elongated and spaced, between said first (10) and said second (20) ribbon of fibrous and porous material in an undeformed state, to make a composite elastic material shaped like a ribbon (100 ), characterized in that said composite elastic tape (100)? closed on itself in a ring and fixed along a first edge (100?) to said absorbent central body (6), and? adapted to surround the waist of a user so as to make said diaper (5) wearable like a panty. 2. Panty diaper (5) according to claim 1, characterized in that said composite elastic band (100)? partially folded on itself along a second edge (100 ??) distal with respect to said absorbent central body (6), so as to overlap two of said strips (2) of elastic material, doubling the elastic holding force at the waist of the user.