DE2361288A1 - STABILIZED ABSORBENT PAD OR PILLOW - Google Patents

Description

Br.-lhg. Wilhelm McM Dipl.-Ing. Wolfgang Rich!

6 Frankfurt a. M, I.

Park Street 13.

7722

CANADIM INTERNATIONAL PAPER COMPANY, Montreal, Canada, V »St.A.

Stabilized absorbent pad or pillow

The invention relates to absorbent pads or pads, especially pads that absorb excretions from the human body.

Absorbent pads or pillows are used, for example, as ¥ and bandages, sanitary wipes, disposable diapers and the like are used. In all of these cases it is expected that the underlay maintains its position with respect to the human body and easily picks up and absorbs waste. These documents or pillows are usually attached to the body, e.g. by means of underwear, suspenders, ribbons or the like.

Loose wood fibers, which are also called "fluff" or flaky layer in the professional world, are often found in such Documents used. When making an absorbent Underlay using wood fibers, a technique is used in which the fibers are perforated through air or porous support can be placed around a pillow or

409824/1110

to build a base with the desired contour and thickness. According to this method, the fibers become random deposited on the openwork support, mechanically interlocking with each other so that the base experiences a cohesion. The fiber to fiber ratio the flaky layer consists of a loose association of the fibers with one another, so that the pad or the pillow has only a very weak cohesion. One such method of manufacture is in U.S. Patent 3,598,680 described on 1.0. August 1971 in the name of CA. lee was issued. This patent also describes one type of base made of a flaky layer. Another on Patent application filed August 31, 1971 under Serial No. 174,092 in the name of Warren R. Furbeck another pad from a flaky layer.

When such a pad as described above is applied to a human body, it works, ~. due to normal body movements. This working of the pad leads to the fibrous material migrates within the document. Such a migration is particularly noticeable when the surface is through a Fluid excretion is wetted. In many absorbent pads, the absorbent material is between Arranged arches that support the pad or the pillow and prevent the same from falling apart. Disposable diaper pads are often structured like this. In use, the weak fiber-to-fiber bond is insufficient for the support to hold together so that the fibrous material settles within the pad against the lowest point in the pad. For example, if the pad is in a disposable diaper is used, the flaky layer tends to migrate down from the waist area when the child is usually around emotional. If the same diaper is now damp, e.g. with urine.

4 09824/1110

the fibers that absorb the urine become heavier than the dry or less moist fibers. The moisture also seems to affect the mechanical bonding of the fibers to decrease. In either case, the damp fibers tend to form clumps or clusters of fibers, some of which can become so large that they are uncomfortable for the child bring opportunity with it. Such settling and clumping also reduces the desired absorption properties the pad to take up more excretions and it rather promotes the escape of the Excretions.

The present invention is based on the object of a fibrous to create absorbent pad or pillow that prevents migration of the fibrous contained in it Material is stabilized. It is also intended to create an absorbent pad which has a flaky layer which in their relative position within the pad by means of a network of bonds between the Fibers of the flaky layer and a number of threads is held, which are incorporated in the base.

The above object is achieved by means of a base according to the invention is characterized by a number of threads that are spaced from each other and extend from part to extend part of the backing, and by an adhesive that is between each "thread and adjacent fibers is introduced, the adhesive and the threads forming a connecting network, in which the strength of the adhesion of fibers to — a thread decreases as a function of their distance from the thread, and in which, furthermore, "those fibers in the one part of the substrate which are connected by the glue to a certain thread, further via this thread with those other parts of the Are connected to the base into which the thread extends,

409824/1110

whereby the base is stabilized and migration of the fibers within the base is avoided.

The invention will now be described in detail with reference to the accompanying drawings, all of which are derived from the description and the details or features emerging from the figures can contribute to the solution of the problem within the meaning of the invention and included in the application with the will to be patented became. Show it:

1 shows an oblique view of an absorbent pad, incorporating various features of the invention;

Fig. 2 is a partial sectional view along the line 2-2 of Fig. 1;

Figure 5 is an enlarged view of part of an absorbent A pad containing various features of the invention and illustrating the threads to which an adhesive is assigned;

4 shows a partial view of a further exemplary embodiment the absorbent pad and

Figure 5 is a partial view of yet another embodiment of the absorbent pad.

First of all, it should be noted in general that the absorbent pad described below comprises numerous loose cellulosic fibers which are randomly brought together or piled to form the pad. Numerous elongated filaments are introduced into the pad in a kind and ^T, V3ise _s that many fibers are concatenated in the base with threads or anchors that the pad against settling and / or clumping stabilized

409824/1110

is. The threads are spaced apart and each carries an adhesive that extends from the thread into the fibrous material of the backing extends to contact and connect the individual fibers with the thread. These Weaves act to unite the fibers of any given section of the backing with that part of the thread in such a section, so that these fibers are no longer free and can wander away from the thread. The novel thread extends from part of the base in the other parts of the document. In each section the fibers are glued to the thread so that the thread is elongated Serves anchor, which extends into many parts of the base and links them together or together- ^ · holds. Other sections or parts of the document are indicated by other threads connected to each other. In short, the threads and the network of adhesive bonds anchor the individual Fibers and hold the anchored fibers in their correct Position within the backing, which makes the fibrous material held together within the base and stabilized will. .

It has now been found according to the invention that the settling and clumping can be effectively reduced or virtually eliminated when placed in a pad 16 numerous elongated threads 18 in a flaky layer be introduced within the pad by a Network of connections are interconnected, which stabilizes or secures the fibers against migration. The bonds between each thread 18 and those fibers which are adjacent to the thread form a network of weaves in which those fibers 22 that are closest to the thread are effectively in position next to the thread * are held in such a way that the fibers do not migrate away from the thread. A major part or all of these fibers can be in be embedded in the adhesive so that they work properly with the

409824/1110

-O-

Threads are chained. Those fibers 24, which are located at a slightly greater distance from the thread, are indeed; not so firmly held, but still firmly anchored to suture 18 to reduce their tendency to wander off the suture. The fibers 26 which are further away from the thread also have a reduced tendency to migrate away because they are mechanically linked to a number of fibers which in turn are firmly connected to the thread. The anchoring or chaining of individual fibers on a thread is transferred in this way, albeit to a lesser extent, to fibers that are not in direct contact with the adhesive. This attachment of the fibers to a "thread with decreasing strength as a function of their distance from the thread is repeated with each thread. begins after the fiber bond of an adjacent thread has also essentially disappeared or has ceased to have an effective binding force the network of bonds by an amount is open, which is seepage and leakage of liquid wastes in the backing does not appreciably reduced. It is therefore _s their alignment and the distribution of the adhesive selected and the distance between adjacent fibers so that the seepage and seepage of the liquid waste in the substrate prak table is not affected.

The term "thread" used in the description is intended to Threads or yarns made from natural fibers or synthetic fibers include, for example, threads or yarns made from textile fibers predetermined length, synthetic fibers of predetermined length or twisted synthetic bischen threads are made.

40982 4 / 1U0

However, it is preferred to end threads made of twisted fibers as threads or yarns for the present purposes. These threads take up the glue in the spaces between the fibers of the Fadens lightly so that they as ■ impeccable · carrier serve for the adhesive to create a good bond between the fibers of the backing and the thread. Such Twisted threads are supple and pliable, so that their 'embedding in the substrate has the desired flexibility and flexibility of the pad or pad is not noticeable diminishes. '

In Fig. 1, an absorbent pad 10 is shown, which has a lot of fibrous material,., which is contained in of a kind and ¥ ice that it is the outline and accumulated the contour of the base is limited. '

A suitable fibrous material has a flaky layer of cellulose 16, the fibers of which are less than about 9.5 mm (3/8 inch) in length, and which are obtained by: that a wood pulp is broken down into individual fibers as far as possible. These fibers are used in the shape of the backing brought or piled up, e.g. by making the fibers laid by means of air on a porous or perforated support. When piled this way into a document are as shown in Fig. 1, the fibers are within the base arbitrarily oriented and mechanically linked to one another, to the extent that the base is at least self-supporting. In general, this means that the base does not fall apart and that the Do not move fibers relative to one another when the dry surface is in a resting position or is not moving. The bonds between the fibers in the fluffy layer, however, are such that a working of the fibers relative to-. each other, which frees the fibers and causes the backing disintegrates. The base from the flaky layer is used to--

40 9824/1110

lent wrapped to allow handling of the flaky layer make it possible without it disintegrating. A suitable means for this wrapping of the flaky layer is by the same insert between sheets 30 and 32 of a material, which is permeable to liquids, but supports or carries the flaky layer and prevents the escape of loose fibers. " Pulp sheets with a basis weight between approximately 3.15 and 6.75 kg per 265 m- (7 and 15 pounds per ream of 2880 square feet) are well suited for this purpose. These sheets 30 and 32 support the flaky layer 16 from. sufficient so that it can be handled during formation of the pad into a disposable diaper.

The threads 18 present in the illustrated embodiments are generally straight and parallel. This orientation the thread has been found to be satisfactory and favors fast manufacturing processes. It will however noticed that the threads in the transverse direction, in the longitudinal or diagonal direction of the backing or can extend in a combination thereof. Furthermore, the threads can run serpentine through the flaky layer. -

The threads are preferably not so large or strong that they unacceptably stiffen the substrate or cause undesirable bulges, Create ribs or the like in the base. Synthetic fiber threads or synthetic multifilaments Threads with a denier number between 100 or 200 form the Anchoring cords or connectors for the base. Textile threads between about 30 and 100 Tex are also suitable for the document described here is suitable. Have cotton threads proved to be particularly suitable due to their ability to absorb the preferred adhesive, their relative suppleness, flexibility and low cost.

4Q9824 / 1110

70 Tex cotton threads are preferred as they are the desired Bring firmness and are not so large that the product becomes uncomfortable or unsightly.

Different adhesives bring acceptable bonds between the Fibers of the flaky layer and threads. The adhesive preferably consists of a cold water-soluble version, e.g., polyvinyl acetate or polyvinyl alcohol and the like. These adhesives connect the threads and fibers, as described above, but do not make the base hard. they allow also a more complete dissolution of the document, if this thrown away after use. These adhesives are also compatible with the environment. making the flaky Layer and handling of the same is present, and where volatile or flammable solutions present unacceptable hazards.

According to one embodiment of the absorbent pad 10, the flaky layer 16 is generally rectangular in shape Formed pad having numerous individual and spaced apart aligned filaments 18 which extend generally along the longitudinal extent the pad. As shown in Figures 1, 2 and 3, each of the threads 18 is coated with an amount of glue 34 provided, which extends away from the thread into the fibrous material extending beside the thread .-- The radial or tentative spread (tentacular-type spreading) of the glue from that. thread away into the fibrous backing causes an effective. Bond between the thread and those fibers 22 which are in close to the thread. Other fibers 24 carried by the thread a greater distance are due to the glue arms or sensor 34 only partially anchored to the thread. Other • Fibers 26 that are even further away do not come with the adhesive in direct contact, but are mechanically linked to those fibers that are either directly or substantially are bound directly to a thread 18 by the adhesive 34.

409824/1110

- ίο -

As noted above, the bonds between the Fibers and each thread the fibers from any given section of the backing with that part of the thread in it Section. The thread therefore unites each section of the diaper with other sections of the diaper or backing into which it is the thread extends.

In addition to the bond between the fibers and a thread, the adhesive 34 also anchors the thread to the pulp cover sheet 30 of the absorbent backing in one embodiment. In this way, each thread is connected to the fibrous along its \ length Material of the backing and anchored to the integral pulp cover sheet so that the thread has practically no movement within the Document is subject. In one embodiment, one has 70 tex construction wool through a bath of polyvinyl chloride adhesive from which each filament was withdrawn through a 1.6 mm (1/16 ") diameter hole in the bath tank. This resulted in a deposit of about 1/2 g of the adhesive on each 3.5 πι (14Q ") thread length. These threads carrying an adhesive put one on a pad of a flaky layer and covered them with a pulp sheet. This structure was compressed to an extent that the glue stripped away from each thread spread into the flaky layer. In one embodiment, an absorbent pad for a disposable diaper the pressure was sufficient to force the adhesive off the filament up to about 6.3 mm (1/4 ") radially from the filament surface. In On a 305 mm (1.2 ") wide diaper, the threads were spaced about 25.4 mm (1") apart, about Started 38 mm (1 1/2 ") inward from one side edge of the diaper. This distance was found to be sufficient to accommodate a annoying deposition or lump formation in the diaper is effective avoid. You can also use other distances and glue distributions, depending on the property of the fibers to wander and depends on the degree of anchoring required to achieve this to avoid.

409824/1 1 10

361288

Further embodiments of the absorbent pad are shown in Figures 4 and 5. In Figure 4 are for the elongated Threads 36 arranged in that part of the base 16 from the flaky layer, which is next to the lower Pulp sheet 32 is located. These threads are therefore in an opposite position to the threads 18 in the upper position according to FIG. 1. In the embodiment shown in FIG one achieves the advantage that the thread material away from the wearer's body. In general, this does not pose a serious problem when dealing with threads with relative small diameter used. However, it is noted that Stronger threads can be used which cause some discomfort if they are in close proximity to a wearer's body. In Figure 5 is a Absorbent pad 38 shown, the two layers of one. has flaky layer 40 and 42, which are superimposed are, with reinforcing threads 44 at the intermediate surface 46 between the two layers 40 and 42 of the flaky layer are arranged. It should be noted that other positions or combinations of positions for the threads. within the absorbent Document are permitted. Such can actually be desired be when you get maximum stabilization of the flaky layer wants to achieve within the document. This last one The aim can be achieved in that one threads on the top and bottom of the base from the flaky layer and / or threads in the middle of the base and on an or provides several opposite flat sides of the base.

In a further embodiment, the threads over the side or front edges; the pad 10 also extend. In so far as these threads carry adhesive, these parts, which extend beyond the edges of the base, are useful for connecting sheets of material between which the underlay can be arranged. For example, the pulp sheets 30 and 32 wider and / or longer than the flaky one

. 409824/1110 '

Layer 16 can be made so that these arcs extend over the Edges of the flaky layer extend out to form an envelope for the flaky layer. .When you get the threads over the edges of the flaky layer leading out and between the brings two cellulose sheets, the threads carrying an adhesive connect the cellulose sheets to one another, and indeed to it spaced points along the edges of the flaky layer, and thus also prevent one Escape. The flaky layer.

409824/1110

Claims (13)

23Ö1288 - 13 - ■ Patent claims MJ Stabilized absorbent pad, consisting of a quantity of wood fibers, '■>.-' ■ '_'_ . , " marked by a number of threads (-18,44) ^ which are spaced apart and extend from part to part of the base, and by an adhesive brought between each thread and adjacent fibers, the adhesive and the ' Threads form a connecting network in which the strength of the adhesion of the fibers to a thread as a function of their Distance to the thread decreases, and in that. furthermore those Fibers in one part of the backing covered by the glue are connected to a certain thread, are further connected to those other parts of the base via this thread *, into which the thread extends, thereby stabilizing the base and allowing the fibers to migrate within the base is avoided. 2. pad according to claim 1, d a d u r c h g e 'k e η η ζ e i c h η e t, that the adhesive is generally radially from the threads (18,44) stretches away. 3. pad according to claim 1, thereby g e k e η η ζ e i c h η e t * - that the glue comes off the threads in the form of feeler arms extends away, grasp the neighboring fibers and bind them to the thread. . - \ 4. Pad according to one or more of the preceding claims, dadurchgeke nn ζ eich η et _t that the adhesive extends away from each thread by a distance which is less than about 6j3 mm (1/4 "). 409824/1110 5. Pad according to one or more of the preceding claims, characterized in that the adhesive is water soluble. Ö.Under one or more of the preceding claims, characterized, that each thread is about 1/2 g of glue per 3.5 m (140 ") Length of thread. 7. Pad according to one or more of the preceding claims, characterized*, that a cellulose sheet (30,32) is arranged on at least one flat side of the base. 8. Pad according to claim 7, characterized in that. that the threads are connected to the pulp sheet. 9. Pad according to claim 1, characterized by at least two superimposed layers of a flaky layer (40,42) with the threads (44) at the interface between these layers are arranged. 10. Pad according to one or more of the preceding claims, characterized in that the threads have cotton fibers. 11. Pad according to claim 10, characterized in that that the threads of cotton fibers are between about 30 and 100 tex. 409824/1110 12. Pad according to one or more of the preceding claims, . : characterized, that the threads extend over at least one of the edges of the base extend beyond .. '■ 13. Absorbent pad according to one or more of the preceding Expectations, . dadur -C hgeke η η ζ eich η et ₉ that numerous wood fibers are obtained from a wood pulp and placed on a cellulose sheet by means of air in an arbitrary orientation in order to form the base, that the fibers are mechanically connected to one another by a force which, however, is normal If the underlay does not work in use, a number of spaced apart fibrous threads extend from part to part of the underlayment; .3 mm (1/4 ") measured radially from the longitudinal axis of a thread is that-the adhesive and the threads form a bonding network in which the strength of the adhesion of those fibers between adjacent, spaced-apart threads to one of the threads are arranged, generally as a function of the distance of these fibers from their next thread decreases, so that this Fibers are anchored to a thread and those fibers in a part of the base that are anchored to a certain thread are further connected via this thread to these other parts of the base into which the thread extends, whereby the base is stabilized and a change in the fibers within the substrate is prevented. ReFu / PiGr. 409824/1110 L e r s e i t e