JPH04503168A - Absorbent products for body use - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Liao Yuan +! ! Noa type product Background of the invention 1. Background of the invention The present invention relates to the field of absorbent products used in particular by people with incontinence. Torine Additionally, the present invention provides highly absorbent polymers due to the inclusion of superabsorbent polymers in embossed target areas Used in absorbent diaper or pant-type products, as well as absorbent pads.

2. Description of prior art of body-absorbing products ranging from infant diapers to adult briefs for those with urinary incontinence. There have been many recent advances in the field. One major area of progress is the widespread use of superabsorbent polymers. In the field of remers, such as starch, acrylic modified cellulose, gum, etc. In some respects, superabsorbent polymers are cellulose fluff used in body-absorbent products. and other common absorbent media1, for example, the polymer has a weight It develops an absorption capacity much greater than 7 lakh in the standard.

In addition, superabsorbent polymers can also be used under pressure, when the absorbed liquid is It absorbs much better than a "squeezed out" flanno released from the flanno. Contains liquid.

However, superabsorbent polymers as components of body absorbent products have some drawbacks.

In general, superabsorbent polymers are inferior to furanos in terms of liquid absorption rate. super absorbent The disadvantage of polymer ponds is that the layer containing the superabsorbent polymer is wetted and the polymer becomes liquid. The gelled polymer, which absorbs water and expands to many times its dry size, enters a layer of additional liquid. This is known as ``gel-blocking,'' which prevents irritability.

Superabsorbent polymers lend themselves well to incorporation into absorbent products because they are finely divided. This makes manufacturing difficult.

In thousands of cases, superlayers are included, as disclosed in U.S. Pat. No. 4,381,782. The insert is then placed into the absorbent article such that the laminate is adjacent to the wearer.

In preferred embodiments, the fluff layer and laminate physically integrate the two layers. , between the rolls creating a transfer area that quickly transfers the liquid away from the wearer and into the graph. embossed with.

In other embodiments, the absorbent insert is applied to the laminate on a smooth roll and an embossed roll. Manufactured by embossing, trimming, and folding the embossed laminate between will be built. The insert is folded back and has an exposed pattern of embossed recesses in the center An insert is made with a lateral region having an exposed smooth surface on each side of the region and a central region. will be built.

In yet another Li, the absorbent insert is fluffed with superabsorbent polymer powder. deposit on a portion of the layer, cover the powder with at least one tissue layer, and remove the assemblage. embossed to quickly transfer liquid away from the wearer and into the fluff layer. manufactured by creating an integrated absorbent insert.

According to another embodiment, the absorbent insert includes superabsorbent polymer powder in a layer of fluff. at least one portion of the fluff on which the polymer has been deposited; Cover with two laminate layers and emboss the assembly so that the liquid quickly drains into the graph. A structure with a transfer site that transfers into the fluff layer for absorption by the dispersed polymer powder. Manufactured by creating a combined absorbent insert.

Brief description of the drawing FIG. 1 is an exploded perspective view of the absorbent component of one embodiment of the absorbent product according to the present invention.

FIG. 2 is an exploded perspective view of the absorbing component and the upper and lower tee and shoe layers shown in FIG. Ru.

Figure 3 shows an absorbent core containing the components shown in Figure 2 after being integrated by an embossing operation. FIG.

FIG. 4 is a perspective view of the absorbent core during a trim operation.

Figure 5 is an exploded perspective view of the components of one embodiment of an absorbent product incorporating the absorbent core shown in Figure 4; It is.

FIG. 6 is a perspective view of a completed absorbent product according to the 16th aspect of the present invention.

FIG. 7 is an exploded perspective view of a second and second absorbent component according to the present invention.

Figure 8 shows the diagonal of the absorption components shown in Figure 7 after they have been combined by embossing. This is a perspective view.

Figure 9 is a perspective view of the tinsier packaging operation applied to the embossed components shown in Figure 8; be.

FIG. 10 is a perspective view of the embossed component after cutting and folding operations.

Figure 11 shows an absorbent product incorporating the tinted embossed absorbent component shown in Figure 10. It is an exploded perspective view of the item 2a.

Figure 12 produces one of the absorbent components of the third and fourth embodiments of the absorbent product according to the invention. FIG. 2 is a perspective view of an apparatus for depositing polymers.

FIG. 13 shows a third ilLi-like sample of the present invention containing the components produced in the apparatus shown in FIG. 12. FIG. 3 is a perspective view of an absorbing component.

Figure 14 is an exploded perspective view of the absorbent components and upper and lower tissue layers shown in Figure 13. It is.

Figure 15 shows the absorbent core containing the components shown in Figure 14, which were formed by embossing them. It is a perspective view after integration.

FIG. 16 is a perspective view of the absorbent core during a trimming operation.

FIG. 17 shows the fourth Li-like absorption of the present invention containing the components produced with the apparatus shown in FIG. 12. FIG. 3 is a perspective view of the components.

'rjJ18 is the decomposition of the absorbent components and upper and lower tissue layers shown in Figure 17. FIG.

Figure 19 shows the absorbent core containing the components shown in Figure 18, which were formed by embossing them. It is a perspective view after integration.

FIG. 20 is a perspective view of the absorbent core during a trimming operation.

Detailed description of the invention Referring now to Figure 1, the absorbent components of one embodiment of the absorbent product are shown at - It will be done. One of the absorbent components 20 is a moisture-absorbing material 22, such as cellulose fluff, fluff, etc. It is a relatively thick layer of fluff made of roughened wood pulp, cotton stuffing, etc. Absorption ingredient 20 The other is a tissue on which superabsorbent polymer particles are deposited and fixed. A layer 24 of laminate comprising: Preferred materials for laminate layer 24 include It is a laminate containing a superabsorbent polymer of the acrylic type. such laminate Gelok International From “Gelok6000 double ply/ double ply) (1080) Daisei can be used under the J trademark.

The laminate layer 24 extends over the central target area 26 of the fluff layer 22, indicated by dotted lines in FIG. can be layered on top. Laminate layer 24 does not span the entire length or width of fluff layer 22 However, larger laminate layers can be used. The laminate layer 24 is Has a very high absorption capacity, but the laminate itself is relatively expensive .

Therefore, the laminate layer advantageously ensures that urine excreted by the wearer first enters the absorbent product. It is limited to a target area 26 that corresponds to the area of contact. Goal #iMi Suction in 26 The demand for storage is greatest and the laminate layer 24 satisfies this demand.

Before applying the laminate layer 24 onto the fluff layer 22, water is deposited in the central region 26 of the fluff layer 22. sprayed on top. Moisture transfers from laminate layer 24 to fluff layer 22 during subsequent assembly operations. The amount of water sprayed to aid in deposition is not critical, but layer 22 and 24 may be sufficient to provide some adhesion between the Wetting the top surface of layer 22 will be sufficient.

After spraying water onto the fluff layer 22, the laminate layer 24 becomes fluffy as shown in FIG. It is placed on layer 22 and into target area 26 .

A top layer of tissue 28 is positioned on top of layers 22 and 24, while a bottom layer of tissue 28 is located on top of layers 22 and 24. A shell 30 is located below layer 22. tissue layers 28 and 30 as an absorbent core; After contacting 20, the component is subjected to an embossing step. Smooth roll (not shown) ) is applied to the bottom tissue layer 30 and an embossing roll (not shown) is applied to the top tissue layer 30. The fabric layer 28 is passed through to produce an embossed absorbent core 32. appropriate da The ear embossed pattern is shown in the pattern shown on the surface of the tissue layer 30. It is shown in 3. An embossing die (not shown) that is applied to the upper tissue layer 28 The boss operation is applied to the surface of the tissue layer 28, the laminate layer 24, and the fluff layer 22. A pattern of grooves 34 is created therein. As will be explained later, these grooves 34 define the movement area. from above the upper tissue layer 28 through which liquid quickly flows through the laminate. It leaves the fluff layer 24 and is absorbed into the fluff layer where it is absorbed. Groove 34 has excellent wicking interconnected into a continuous network structure that promotes hair growth properties.

High density between tissue layer 28, laminate layer 24 and fluff layer 22 in groove 34 An interface exists. At this interface there is a physical bond between layers 28, 24 and 22. It provides physical integrity to the absorbent core 32. In the area between the grooves 34 the layer 28.2 4 and 22 have lower densities than these layers have in il$34.

The embossing stage is advantageously carried out at a pressure of about 50 to 1751 b per inch of embossing roll line. In addition to those shown in the upper tinche layer 28 shown in FIG. Various patterns may be suitable for embossing rolls, details regarding embossing patterns. Details are discussed below in connection with some examples of the invention.

Embossing operations were carried out with or without a water spray step on the furano layer. water If not sprayed, the embossing stage will create a physical gap between the fluff layer and the laminate layer. No binding occurred. Rather, the laminate and fluff layers are similar to the prior art slim laminate layers. They were in separate layers, like the layers in an in-product. However, water is injected onto the Furano layer. When the embossing operation is performed after misting, the physical bond between the fluff layer and the laminate layer is occurred between.

The manufacturing steps described with respect to FIGS. 1 to 3 can be carried out using e.g. It will be understood that this can be applied to In particular, the fluff layer 22, the laminate layer 24, Tifshe layers 28 and 30 are fabricated into an infinite length embossed absorbent core 32. which can later be cut to a suitable length and incorporated into an absorbent product according to the invention. Can be done. After embossing the absorbent core 32, preferably two compression rolls (Fig. (not shown). This step Adds additional integrity to the bossed absorbent core 32 and improves consistency by producing a thinner absorbent product. Layers facilitate economical packaging.

Referring now to FIG. 4, the embossed absorbent core 32 then trims the ears 36. manufacturing an absorbent insert with a leg cut of 40 for incorporation into an absorbent product. shown after. The cuts 40 extend inwardly toward the laminate layer 24 and terminate just before it. Ru. The selvage 36 can be recycled to provide further material to the fabrication of the fluff layer 22, if desired. can be generated. Trimming involves cutting the embossed absorbent core 32. can include a cutter for manufacturing the absorbent insert 38 of a given length. This can be done with a punching machine.

Alternatively, you can use a separate cutter to cut the absorbent core material to length. Ru.

- Referring to FIG. 5, the water-impermeable backing sheet 42 covers the absorbent insert 38 Shown below. A number of lines 44 of hot melt adhesive are applied longitudinally to the backing sheet 42. It is applied across its entire width in the direction. In the exemplary embodiment, the elastic member 46 is They are fixed to the backing sheet 42 in parallel with each other at intervals. preferably elastic Member 46 is attached to the backing sheet by adhesive applied to it and backing sheet 42. 42, including a number of individual elastic threads secured to it. Next, the center portion 48 of the elastic member 46 is tensioned and the tensioned elastic member 46 is applied to the adhesive on the backing sheet 42. Ru. Once the adhesive has hardened and the tension has been relaxed, the gears 58 (FIG. 6) are attached to the elastic member 4. 6 near the center 48.

Also shown in FIG. 5 is a raised sheet 50 having the same length and width as the backing sheet. It is. The top sheet 50 allows liquid to be absorbed in the absorbent insert 38. It is made of non-woven fabric that can be easily passed through. Some spray of hot melt adhesive 52 generally corresponds to the width of the absorbent insert 38 in the longitudinal direction of the top sheet 50. It is applied on the center with a width. Line of hot melt in place 44 and spray 5 2, the components shown in FIG. assembly by placing the top beam sheet on top of it. After assembly, Pass these ingredients between compression rolls (not shown) to ensure a good bond between them. Facilitate.

Referring to FIG. 6, after trimming the leg cuts 56, the absorbent product 54 is shown. The gears 58 cut the legs 56 by the center portion 48 (FIG. 5) of the elastic member 46. Formed near the center of.

Gears 58 facilitate proper fit of absorbent article 54 near the wearer's legs. This helps prevent leaks. Adhesive tab fasteners 60 are already known. The absorbent article 54 is secured to the rear panel 62 of the absorbent article 54 so that The tab fastener 60 is Adhesive side surface 64 that is fixed and held on the IAH gi 66 until the product 54 is worn The tab fastener 60 is attached to a release paper 66 by positioning the absorbent product 54 on the wearer. Lift the adhesive side 64 from the backing sheet 4 on the front panel 68 of the absorbent article 54. 2, thereby securing the absorbent product 54 to the wearer. Preferably, The adhesive on the sides 64 of the tab fastener can refasten the tab fastener. It can be peeled off from the backing sheet 42 and fastened to it again. be.

Example 1 The absorbent core corresponding to Core 32 is made of cellulose fluff and block 600〇2 layers/2 layers. Manufactured from a layer (1080) laminate. The superabsorbent polymer in the laminate is Aridal+ 1080 product name Chemda I It was a polyacrylate product sold by ). The core has 1 on its upper surface Embossed with an inch x 1 inch diamond pattern. The groove had a width of approximately 2 inches. Ko Approximately 45% of the surface area of the core is made up of grooves, and the remaining 55o/6 of the surface area of the core is made up of grooves. There was no.

Control A, B, C, D, E, F and G For comparison, some absorbent cores not according to the invention were made as follows. .

Absorbent core A is an absorbent core having the same standard weight as the cellulose fluff used in Example 1. Constructed of bossed cellulose fluff. Core A is the same diamond m as the core of Example 1. Embossed with m.

Absorbent core B is a non-embossed material having the same standard weight as the flanno used in the manufacture of Example 1. It included cellulose fluff.

Absorbent Core C has two layers of Geroku 6000/two layers (108 0) layer. This core is similar to Example 1 in that it was simply not embossed. It is different from. This core corresponds to the core of products sold under the Slimline trademark. .

Absorbent core D is made of Aridal 1080 polyacrylate super absorbent synthetic polymer on the upper part. It included a layer of embossed cellulose fluff sprinkled with. super absorbent polymer The amount is per square inch of cellulose fluff, block 600〇 double layer / double layer (1080 ) to give the same weight per square inch of superabsorbent polymer in the laminate. was controlled.

Absorbent Core E has Aridal iogo polyacrylate superabsorbent polymer sprinkled on top. A layer of woven, non-embossed cellulose fluff was included. 1 The amount of absorbent polymer is Roulose fluff per square inch, block 600〇 double layer / double layer (1080) lami controlled to give the same weight per square inch of superabsorbent polymer in the did.

Absorbent core F corresponded to Example 1 except for the embossed pattern. Diamond shape double boss Rather than a pattern, the absorbent core F is embossed between smooth upper and lower embossing rolls. I embossed it.

Absorbent Core G is split into two layers, with Aridal 1080 polyacrylate super absorbent in between. This included cellulose fluff sprinkled with a synthetic polymer. The amount of superabsorbent polymer is Roulose fluff per square inch, block 600〇 double layer / double layer (1080) lami controlled to give the same weight per square inch of superabsorbent zwitterionic polymer in the did.

The absorbent inserts and absorbent cores A-G of Example 1 were evaluated for absorbency (speed), wicking and and skin wetness. The procedure for each test is described next. The results of each test are Shown in Table 1.

Absorption power In this test, a 4 inch x 4 inch square sample of absorbent core material was Place on a horizontal surface together with the backing material. A test plate with a number of uniformly spaced holes is sampled. Place it on top. The test plate holds the test liquid until it passes through the pores and into the absorbent core. It has the aspect of The test liquid is a 1.0% NaCl solution. Test liquid 10.0 After introducing the ml into the test plate, start the timer. The test liquid flows from the test plate through the holes. Stop the timer when it passes through and moves into the absorbent core. The results of this type of test Indicates the rate at which the collected product absorbs urine. For example, this absorption test has a time of 2 seconds. An absorbent core with a time of 5 seconds will have a faster speed in this absorbency test than an absorbent core with a time of 5 seconds. will absorb urine.

skin wet In this test, a 3" x 5" rectangular sample of absorbent core was placed with a water-impermeable backing. Place it on a horizontal surface together with the material. Place a 50ml sample of 1.0% NaCl solution in the center of the sample. is deposited at a rate of 7.0 ml/sec. Absorbent paper towel 3 inches x 5 inches long Cut into squares and weigh the paper towel pile weighing approximately 18 g and record its dry weight. Ru. After 60 seconds of placing the 1.0% NaCl solution on the absorbent core sample, pre-weigh it. Place a pile of paper towels on top of the absorbent core sample in a 3 inch x 5 inch rectangle. Place a 5 pound shaped weight on top of the paper towel. After 15 seconds, remove the weight and then Reweigh the wet paper towels. Subtract the weight of the dry towel from the weight of the wet paper towel. Corresponds to the weight of 1.0% NaCl solution released by the absorbent core into the towel Give the skin wetness number. The lower number is that the absorbent core has good retention of liquid and the adjacent skin indicates that the liquid remains relatively dry, while a high number indicates that the liquid is easily absorbent. This indicates that the skin is released from the skin and the adjacent skin becomes relatively moist.

siphoning In this test, a Finch × Finch square sample of absorbent core was used with a water-impermeable backing. and place it on a horizontal surface. 25.0ml sample of 1.0% NaCl solution containing blue dye The material is applied from the billet to the center of the sample at a rate of lO101O per second. Billet The tip of the tip should be % inches away from the surface of the absorbent core sample to prevent splashing of the test liquid. be done. One minute after applying the test solution, the area around the wet spot was marked, and the first axis and Measurements are taken along a second axis offset by 90 degrees from the first axis. Therefore, the conclusion of this study is The results are shown for two measurements. A pair of small measurements for the absorbent core are The core has relatively poor fluid distribution or wicking, such that the fluid is in one area of the absorbent core. Accumulation indicates that the absorbent capacity of the remote dry areas of the absorbent core is not utilized. reverse A pair of large measurements for the absorbent course indicates that the core is relatively good at wicking fluid. , indicating that the liquid is well distributed throughout the absorbent core.

Table ■ Absorption power, skin wetness, wicking (Complete e@L absorption (absorbed from towel) (liquid) , grams of liquid side-side top-bottom) Example 1 2.3 12.4 53/4'' 6' Core A 1.5 19.0 4 '4' Core B 1.7 19.3 3'/2' 3'/2' Core C5, 59, 04'/4' 4'/2' Core C5,0 Core C “-2,23’/2” 4’/4’ Core D 1.8 12.1 3’/ 2” 3’/2# Core E 1.4 11.3 3’ 3’/4’ Core F1.3 Core F" ---8,45'/4' 4" Core G 2.0 14.2 3'/4 “2374′ (Note: Cores marked with an asterisk have test results other than those reported in the surface. Manufactured from a different batch of laminate than the laminate incorporated into the absorbent core Comparison of skin N wetting numbers for the first and third "Core C" structures showing absorbent cores As suggested, the laminates incorporated in the core marked with an asterisk are It had a higher concentration of superabsorbent polymer than the incorporated laminate. Therefore, the star Comparisons between results for marked and unstarred cores should take this into account. It is. ) The results shown in Table ■ regarding absorption capacity show that non-embossed core C has relatively poor absorption capacity. , a layer of laminate, indicating that the core of Example 1 has relatively good absorbency. Of the cores included, only core F had a better absorbency number than the core of Example 1. fruit The groove area in Example 1 allows liquid to be quickly absorbed through the laminate layer and into the fluff layer. It is theorized that it promotes the development of Core F embossed with flat roll Imitating the grooves in Example 1, the rapid absorption of liquid into the core F was achieved very quickly when the grooves were used. This supports the theory that strong absorption exists. However, the structure of Core F has drawbacks. This is shown by a comparison of skin wetting numbers for core C0 and core F1. Core C " gave up only 2.2 g of liquid, while core F0 gave up 8.4 g.

This shows that core C1 without grooves has a much better liquid flow than core F0, which corresponds to 100% grooves. Therefore, after 1 minute the liquid passes through the laminate to the core F0 while core C1 without grooves can flow backwards out of the skin wetting test. Handed off very little liquid.

The embossed pattern of the core of Example 1 is a continuous network of grooves showing the ability to promote good wicking. Contains morphological structures. In fact, the core of Example 1 had a good wicking number as shown on the surface. However, direct comparison between cores C0 and Fo and other cores is not guaranteed.

Additional samples of the core were separately manufactured and tested. The additional core is the core of Example 1, Core B and corresponded to core C. Core C and some cores corresponding to the cores of Example 1 were The other of these cores was subjected to a skin wetness test by soaking a towel and a 5 pound weight in a moist solution. y instead of 1 minute later! 10 minutes after ti Jun on the sample! In the modified skin wetness test I got it.

The results are shown in Table ■.

Table ■ Wet the skin for 1 minute Wet the skin for 10 minutes (g) (g) Example 1 6.7 3.0 Core cs, s 1.6 The results shown in Table ■ indicate that the superabsorbent polymer absorbs liquid after 1 minute of wetting. This shows that as time passes, the skin wetting performance of the core of Example 1 decreases. Close to that of C. One minute after wetting, the core of the example work had 3.2g more liquid than core C. However, 10 minutes after wetting, the core of Example 1 weighed 1.4 g more than core C. These results indicate that the core of the example work has much better suction than core C. In addition to showing high yield, it also shows skin wetting performance comparable to Core C after 10 minutes of warming. Indicates that

An additional set of core samples was manufactured separately and a large number of them f! to the ability to absorb moisture I tested it. The test operation corresponded to the absorption capacity test operation described above, but with the exception of a timer. 10 minutes after initial wetting, place an additional 10ml of liquid on top of the core before starting up. there was. Then start a timer and measure the time taken to absorb the second 1otsI wetness. was recorded.

The test results for the cores corresponding to Example 1, Core B and Core C are shown in Table ■. be done.

Table ■ Absorption capacity (for second 10ml wet) (sec) Example 1 19.6 Core B6.0 Core C>120.0 (not all of the liquid was absorbed after 2 minutes) ! ! The results shown in ① indicate that the grooves in the core of Example 1 can absorb liquid even after initial wetting. This suggests that it will continue to serve as a moving site.

Core C, on the other hand, shows no ability to absorb secondary moisture. This will swell and geese. The superabsorbent polymer particles coalesce to allow additional liquid to be absorbed by the core. This is believed to be due to "gel-blocking" forming a blocking layer. Core B Although Core B has excellent absorption capacity for secondary moisture, cannot hold liquids under pressure as shown by

Referring to FIG. 7, the absorbent components of the absorbent product according to the second Lim of the present invention are generally is shown as 70. In this embodiment, the absorbent component 70 includes a top layer 72 and a thick The bottom layer 74 of laid tissue, as well as the top of layer 74, the center of layer 74 and The polymer particles are layered, including a layer of superabsorbent polymer particles indicated by dots 76 in the corners. 74, but the polymer layer The two ends of 74, 78 and 80. The application on the 0 layer 74 does not need to extend until it reaches Layer 72 is combined with layer 74 with polymer particles in place and embossed as shown in FIG. An absorbent core 82 is manufactured.

The preferred embossed pattern is represented by bars 84 in the center and four corners of core 82.

Bars 84 correspond to the areas of compression that were present during the embossing stage. Around bar 84 This is an uncompressed tufted region.

The side surfaces of the core 82 not shown in FIG. 8 have smooth surfaces.

Referring to FIG. 9, a tissue packaging operation is illustrated, with Tinsini paper 86 is wrapped around the absorbent core 82. When the core 82 is fully wound, the excess The tissue 86 is trimmed and the edges of the wrapped tissue 86 are glued or otherwise secured. 10, resulting in a seam 88 shown in FIG. The wrapped core 82 is slit and the side Defining a horizontal region 90 and folding it inwardly opposite seam 88 creates an absorbent insert. 92 is manufactured. Folding the side regions inward exposes smooth surfaces 92. vinegar The slit and fold step extends substantially between the ends of the lateral regions 90 defining the central region 94. The exposed surface in the desk center area 94 is controlled to leave a blank space and is represented by the bar 84. The absorbent article containing the compressed N31i is made of an absorbent insert 92, which contains compressed N31i. Manufactured by sandwiching between a permeable backing sheet 98 and a nonwoven upholstery sheet 100 can do. Hot melt adhesive! 191102 is backing sheet 98 and adhesively fix it to the absorbent insert 92 and the upper resheet 100. . If desired, an elastic member (not shown) corresponding to member 46 (FIG. 5) can be added to the backing sheet. ) 98 (lffllll) to generate gears in the finished absorbent product. I can do it.

After the insert 92 is assembled between the backing sheet 98 and the top sheet 100, As discussed with respect to FIG. 6, 1j cuts will be trimmed from the assembly.

Referring now to FIG. 12, the superabsorbent polymer is applied directly onto the fluff layer 110. The nine layers 110 in which the deposit is described are made of moisture-absorbing material such as cellulose fluff, fluff, etc. It is a relatively thick layer of charred wood bulbs, cotton wadding, etc.

The apparatus used to deposit the polymer powder onto the fluff layer 110 is designated 112 in -i. water spray equipment, including a water spray equipment and a polymer deposition f1 equipment generally designated 114. Is the placement based on pressure? II device 120 at a constant pressure that can be monitored or controlled. A polymer deposition device 114 includes a spray head 116 for supplying water through one A trough 122 for holding polymer powder indicated at 24 and polymer powder 1 24 is discharged from the trough 122. nothing. Apply vacuum to the fluff layer below the polymer deposition device 114, specifically the fluff 122. and pull the hepolymer powder 124 into the fluff layer which engages and holds the fluff fibers ( A vacuum integration device 128 is provided. The central conduit 130 in the vacuum integrator 128 is It can be connected to a suitable vacuum source (not shown).

The water spray device 112 and polymer deposition device 114 are connected to the dotted line 134 on the fluff layer 110. spraying water into a central region 132 defined between and is made to that size. The polymer deposition device 114 may be continuously or Intermittently, a separation on a central region 132 with deposited polymer powder 124 thereon. The central value area 13 in which the absorbed portion does not have deposited polymer powder 124 thereon It can be operated to be separated by two separate parts. Polymer deposition device 11 As shown in FIG. This results in a continuous layer of polymer powder 124 in the central region 132 of the bath 136 . polymer The intermittent deposition of powder 124 causes polymer powder 124 to spread all the way to the edge. piece 136 except that it retracts from all four sides of the piece. Can be used to manufacture pieces such as.

During operation of the apparatus of FIG. 12, the flannel material making up layer 110 advances from right to left; It first passes under the polymer deposition device 114 and then under the water spray device 112. Poly By controlling the rate of deposition of the mer powder 124 with respect to the rate at which the fluff layer advances. A desired concentration of polymer powder in the furano material 110 can be achieved. In the center area, Rimmer (Aridal 1080 polyacrylate superabsorbent polymer) approximately 130g per square meter The concentration of 1.2 meters is a good concentration. Superabsorbent polymer substance and capacity and More or less polymer can be used depending on the intended application.

After the polymer powder 124 is deposited in the central region 132 of the layer 110, the water or water-soluble An aqueous solution of the adhesive is sprayed onto the central area.

Water or the like promotes bonding between the fibers and polymer powder that make up layer 110. Sara Water etc. play an important role during the embossing operation described below.

Further referring to FIG. 13, a heavy tee whose size corresponds to the central region 132 A layer of tissue 138 is shown.As shown in FIG. onto the base 136, covering the central region 132 and the polymer powder 124 deposited thereon. The polymer powder 124 of the fluff layer 110 is deposited on the zero layer 138, which is placed so as to Layer 138 and layer 24 (FIG. 1) placed on the same side as the side surface Something can happen. If it is a single layer, the tissue should have a velocity of 14 to 18 bonds. The tissue should have a tensile strength of 14 to 22 bonds if the layer is 0. . A single layer tissue with a velocity of 14.5 bonds gives very good results.

Tissue layers 138 and 24 (FIG. 1) are made of tissue that develops good elasticity. 18-33% longitudinal tension is preferred.

In FIG. 14, upper and lower tissue layers 140 and 142 are shown on piece 136. placed in contact with the upper and lower surfaces.

Tissue layers 140 and 142 are lighter than tissue 1138, 12 lbs. A continuous amount of wet strength tissue is applied to layers 140 and 142, and layers 28 and 142. 30 (FIG. 2) and tissue wrap 86 (FIG. 9).

After contacting tissue layers 140 and 142 with piece 136, the ingredients are embossed. put it in stages. Apply a smooth roll (not shown) to the bottom tissue layer 142 and An embossing roll (not shown) is passed through the upper tissue layer 140 on the opposite side to emboss it. An absorbent core 144 is produced. Appropriate diamond embossed pattern on tissue The pattern shown on the surface of layer 140 is represented in FIG. Upper tee The stamping molds (not shown) that are layered on the S layer 140 are the tissue 7, the S layer 140, and the tissue. This creates a pattern of grooves 146 in the fluff layer 138 and fluff layer 110. As explained before These grooves 146 constitute transfer sites through which liquid flows to the upper tissue. A tissue layer 138 is left on top of layer 140 and is quickly absorbed into fluff layer 110. where it is eventually absorbed by the polymer powder 124 dispersed therein.

The grooves 146 are interconnected into a continuous network, which promotes excellent wicking properties.

High density field between tissue layers 13 and 140 and fluff layer 110 in groove 146 There is a side. There is a physical bond between layers 138, 140 and 110 at this interface; It provides physical integrity to the absorbent core 144. In the area between the grooves 146, the layer 138, 140 and 110 have a lower density than these layers have in groove 146. have Polymer powder 124 effectively binds tissue layer 138 and fluff layer 110. Laminated in between. This core structure prevents the movement of powder 124, but This is advantageous because it does not limit the swelling of 24 relatively. Grooves 146 promote fast absorption . This core structure also provides very high capacity, along with the ability to absorb large amounts of moisture. Ru. These properties are due in part to the two tissues of polymer powder in core 144. of polymer powder in absorbent products containing superabsorbent polymers laminated between layers. This seems to be because it becomes a three-dimensional distribution as opposed to a dimensional distribution. The former is a flannel There are degrees of freedom for the polymer that extend throughout the layer, while in the latter the polymer is substantially For example, core C is a superabsorbent material that adheres between two tissue layers in a two-dimensional plane. Absorbent core containing a superabsorbent laminate with an astringent polymer sandwiched between tissue layers As shown in the results shown in Table ■, Core C absorbs the second warm moisture even after 2 minutes. could not. The superabsorbent polymer in the laminate layer in Core C expands and coalesces. It was thought that the liquid would form a two-dimensional barrier layer through which liquids could not pass.

In contrast, the superabsorbent polymer in core 144 is not confined to a two-dimensional plane; Thus, the core 144 can absorb a large amount of moisture.

The core 144 has good skin wetting performance, i.e. it can absorb fluid well even under pressure. Keep it tight. The three-dimensional distribution of the superabsorbent polymer in this core structure means that the polymer swells. making the polymer have a higher capacity because there is more room to stretch I think that the. When a liquid is absorbed by a superabsorbent polymer, it can be released even under pressure. Water that is not emitted and not captured by the polymer will be retained in the furano layer. , although liquid can be extruded from the flannel, this core structure exit and return through the top tissue layer 140. Polymer in core 144 The powder is concentrated on and near the upper surface of fluff layer 110. The absorbent core When not under force, the polymer is distributed in three dimensions as described above.

However, when the core is compressed after wetting, it gels and the swollen polymer particles come into close contact. Provides a barrier layer that prevents liquid from being forced through the upper tissue layer 140 upon contact. Form.

The embossing step is advantageously carried out at about 50 to 175 bonds per embossing roll line inch. 0 other than those represented in the upper tissue layer 140 shown in FIG. A variety of patterns may be suitable for embossing rolls.

The manufacturing steps previously described with respect to FIGS. It will be appreciated that the fluff layer 110, tip material, etc. fabric layers 138, 140 and 142 into an infinite length embossed absorbent core 144. which can be later cut to a suitable length and incorporated into an absorbent product according to the invention. Wear. After embossing the absorbent core 144, it is placed between two compression rolls (not shown). It is preferable to perform a volume reduction operation in between.

This step adds further integrity to the embossed absorbent core 144 and allows for thinner absorbent cores. Manufacturing integrated products facilitates more economical packaging.

Referring now to FIG. 16, the embossed absorbent core 144 is then Absorbent insert having leg cuts 152 for trimming 148 and incorporating into an absorbent product 150 is shown after manufacturing. Cut 152 is defined between dotted lines 134. It extends inward toward, but ends just short of, heart region 132. The ear 148 is If desired, it can be recycled to produce further material suitable for the manufacture of fluff layer 110. I can do it. Trimming involves cutting the embossed absorbent core 144 to a given length. a cutting machine that can include a cutter for manufacturing an absorbent insert 150 of It can be done with Alternatively, use another cutter to cut the absorbent core material into Can be cut to length.

The term flanno used above refers to a web made of loose fibers. Such fiber Also encompasses composite webs made of fibers and containing other materials such as synthetic fibers. intended. For example, No. 1 - Hercules is Pulpex ( The fiber polyethylene which can be advantageously incorporated into the flannel layer under the name Pulpex Ren/polypropylene blends are sold. Valflex is flexed in a 5% amount. It can be mixed into the rough and heated to improve the integrity of the fluff layer.

Referring to FIG. 17, another embodiment of the absorbent core includes a layer 160 of laminates. superabsorbent material deposited in the club layer 164 and the central region 168 of the club layer 164. Pieces 162 are shown in FIG. 12, including a piece 162 of polymer powder 166. The apparatus of Figure 12, which can easily be manufactured with apparatus of the type previously described, is to intermittently deposit polymer powder 166 onto a central region 168 of layer 164 of It is understood that you can drive. In that case, the layer of polymer powder 166 is 162 and before the sides of piece 162 as shown in FIG. end.

Laminate layer 160 is a superabsorbent material dispersed in heavy tissue and supported thereon. Preferably, the laminate layer 160 contains a polymer powder of Two layers, a single layer of 14-bond adhesive and two layers of 10.5-pound adhesive. A laminate made of a 10-day-free polyacrylate absorbent polymer sandwiched between It's Nate. The laminate layer is sized to have a central area on which polymer powder 166 is deposited. As shown in FIG. 18, the laminate layer 160 is piece 16 to cover area 16 and polymer powder 166 deposited thereon. placed on top of 2. Laminate layer 160 includes polymer powder 166 of club layer 164. is placed on the same side as it was deposited. The laminate layer must be single layer or multilayer. Can be done. If it is a single layer, the tische should have a distance of 14 to 18 bonds. . If layered, the tissue should have a distance of 14 to 22 bonds. 14. A single layer tissue with a 5 bond perspective gives very good results. lamination The tissue layer 160 should consist of tissue with good elasticity; 18-33 % red strain is preferred.

In FIG. 18, upper and lower tissue layers 170 and 172 of piece 162 are shown. and in contact with the lower surface. In some cases, a single layer of heavy tissue (Fig. (not shown) can be placed between piece 162 and tissue layer 170. Tee The tissue layers 170 and 172 are comparable to the tissue incorporated into the laminate layer 160. A very light, 12 bond weight wet strength tissue was used for layers 170 and 172. preferable.

After contacting the tissue layers 170 and 172 with the piece 162, the ingredients are embossed. put it in stages. A smooth roll (not shown) is applied to the bottom tissue layer 172 and the mold A push roll (not shown) is passed through the upper tissue layer 170 on the opposite side as shown in FIG. An embossed absorbent core 174 is manufactured. Appropriate diamond embossed JII project is represented by the pattern shown on the surface of tissue layer 170 and is shown in FIG.

The embossed pattern on the stamp (not shown) applied to the upper tissue layer 170 is A pattern of grooves 176 is created in the shoe layer 170, the laminate layer 160, and the club layer 164. Cheating. These grooves 176 constitute the transfer site through which the liquid is directed to the upper tissue. The laminate layer 160 is left on top of the club layer 170 and is quickly absorbed into the club layer 164. where it is finally absorbed by the polymer powder 166 dispersed therein. . Grooves 176 are interconnected into a continuous network that allows deposited fluid to pass through the grooves. Promotes superior wicking to portions of the embossed absorbent core 174 away from the deposition site. proceed.

The polymer powder deposited in the club layer leads to 176 it! ! , liquid to be absorbed confine and inhabit the superior skin drying properties of the absorbent core 174, while the grooves 176 Provides excellent absorption properties. Additionally, emboss the grooves as shown in Table ■. The absorbent core provided (Example 1) is capable of absorbing multiple moistures.

Laminate N160 in groove 176, between tissue layer 170 and club layer 164 There is a high density interface. At this interface there is a physical bond between layers 160, 170 and 164. 2, which provides physical integrity to the absorbent core 174. The area between grooves 176 In the region, layers 160, 170 and 164 have a higher density than they have in groove 176. Has low density. The polymer powder 166 deposited on the club layer 164 is substantially Laminated between laminate layer 160 and club layer 164. This core structure prevents the movement of the deposited powder 166 but prevents the swelling of the deposited powder 166. This is advantageous because it is relatively unrestrictive. The groove 176 is an absorbent insert with excellent absorbency. give a start. This core structure also has a very high capacity, the ability to absorb a large amount of moisture Give with. These properties are due in part to the polymer powder in the core 144; Polymers in absorbent products containing superabsorbent polymers laminated between tissue layers of This seems to be due to the three-dimensional distribution in contrast to the two-dimensional distribution of the mer powder. subordinate Thus, the absorbent core 174 is provided by a superabsorbent polymer dispersed throughout the club. Superior skin provided by embossed laminate/club construction with high capacity Combined with captivation and core integrity.

The embossing stage is advantageously performed at a pressure of about 50 to 175 lb per embossing roll line inch. It is done. Other than that represented in the upper tissue layer 170 shown in FIG. A variety of patterns may be suitable for embossing rolls.

The manufacturing steps previously described with respect to FIGS. It will be appreciated that the present invention can be applied to bulk materials. Among others, club layer 164, laminated The sheet layer 160 and the tissue layers 170 and 172 are embossed with an infinite length absorbent coat. A174, which is later cut into suitable lengths and incorporated into absorbent products according to the present invention. Can be incorporated. After embossing the absorbent core 174, it is compressed into two compression rolls. It is preferable to perform a volume reduction operation during (not shown). This step is the emboss Adding additional integrity to the absorbent core 174 to produce thinner absorbent products and facilitate more economical packaging.

Referring now to FIG. 20, the embossed absorbent core 174 is then Absorbent insert with leg cut 182 for trimming 178 and incorporating into absorbent product 180 is shown after manufacturing. The cuts 182 are inward towards the layer 160 of laminate. However, it ends just before that. Recirculate the ear 178 if desired. can produce materials suitable for manufacturing club layer 164. The trimming is , cutting the embossed absorbent core 174 into lengths of absorbent inserts 180. It can be carried out in a punching machine which can include a cutter for producing. a Alternatively, a separate cutter can be used to cut the absorbent core material to the appropriate length.

The absorbent inserts 150 and 180 can be easily used in diaper products such as the absorbent inserts shown in FIG. It can be incorporated into a product 54. Alternatively, these inserts can be made of non-woven material. A padding product, such as bed batt, is applied to the absorbent product 54 between the layers and the multiple backing. It can be manufactured without having to cut the legs 56.

The foregoing description is provided to enable any person skilled in the art to practice the present invention, and to enable any person skilled in the art to practice the present invention. constitutes the best mode currently known. Modifications will no doubt occur to those skilled in the art. and such modifications are within the spirit and scope of the disclosed and claimed invention. It can be done without deviation.

-’FT0. 10 -F Engineering G, 12 Pure IF (no change in content) The scope of the claims 1. An absorbent core comprising an amount of a superabsorbent polymer or the like, said core but, a first absorbent layer comprising a fluff having first and second major surfaces, positioned adjacent to the fluff layer; at least one non-porous layer of tissue and a superabsorbent polymer or the like; a first portion consisting of less than a given amount of fixed to and supported by the tissue; the first main surface of the first layer; a second layer placed adjacent to and overlying at least the center of the surface; a superabsorbent distributed in the first absorbent layer adjacent to the first major surface of the first absorbent layer; a second portion of a polymer consisting essentially of; The first and second layers are connected to each other by embossing, and the first and second layers have a given density. multiple groove regions and groove regions consisting of compressed and physically integrated portions of the separate regions of the portions of the first and second layers having a density less than a given density between the regions; an absorbent core that defines a physically integrated absorbent core with

2. A substantially smooth pattern is embossed into the second major surface of the first absorbent layer, forming a diamond shape. The absorbent core of claim 1, wherein the pattern is embossed into the twenty-ninth layer.

3. Water-impermeable backing sheet, water permeable cover sheet, and placed between the cover sheet and the backing sort and adjacent to the backing sort; A first layer consisting of a fluff layer and a layer adjacent to the fluff layer with no pores and a small amount of tissue. superabsorbent polymer fixed to and supported by one layer and the other an absorbent core comprising a second layer comprising a laminate layer comprising; The first and second layers are connected to each other by embossing, and a portion of the first and second layers is separated regions with a given density and compressed portions of the first and second layers; defining an absorbent core having a groove region comprising: a groove region having a density substantially greater than a given density; absorbent products.

4. The absorbent article of claim 3, wherein the groove regions are arranged in a repeating diamond-shaped pattern.

5. The absorbent core further includes first and second tissue sheets, and the first tissue sheet A tissue sheet is placed between the first layer and the backing sheet, and the second tissue sheet a cover sheet is placed between the second layer and the cover sheet, and the second texture sheet is embossed. 4. The absorbent product of claim 3, wherein the absorbent product is integrated into the absorbent core by a step operation.

6. Water-impermeable backing sheet; water permeable cover sheet, and placed between the cover sheet and the backing sheet, and having first and second opposing major surfaces. a first layer of flannel having a first major surface disposed adjacent to the backing sheet; at least one piece of heavy tissue placed adjacent to the second major surface of the flanno; a second layer consisting of a sheet, and distributed in the flanno adjacent to the second main opposing surface; Consisting essentially of an absorbent core, comprising superabsorbent polymer powder, The first and second layers are connected to each other by embossing, and a portion of the first and second layers is separated regions with a given density and compressed portions of the first and second layers; defining an absorbent core having a groove region comprising: a groove region having a density substantially greater than a given density; absorbent products.

76 Water-impermeable backing sheet, water permeable cover sort, and placed between the cover sheet and the backing sheet, a first layer being on the backing sheet. a non-porous laminate layer comprising an adjacent fluff layer, and a second layer, the second layer being adjacent to the fluff layer; wherein said laminate layer comprises at least one layer of tissue and tissue G. first and second absorbent layers comprising a superabsorbent polymer fixed to and supported thereon; In absorbent products containing The first and second layers are connected to each other by embossing, and the first and second layers have a given density. Multiple groove areas and between groove areas consisting of two layers of compressed and physically integrated parts with separated regions of parts of the first and second layers having a density less than a given density of An improved absorbent product that defines a logically integrated absorbent core.

8. A substantially smooth embossed pattern runs through the side of the first layer opposite the second layer. 8. The improved method according to claim 7, wherein the diamond shape embossing operation is applied to the second layer. absorbent products.

Procedural amendment (formality) %formula% 3. Person who makes corrections Relationship to the incident: Applicant 5. Date of amendment order February 18, 1992 Month/day 1, 1998

Claims (1)

[Claims] 1. An absorbent core comprising an amount of a superabsorbent polymer or the like, said core but, a first absorbent layer including fluff having first and second major surfaces, adjacent to the fluff layer; at least one layer of tissue and a superabsorbent polymer or the like, which is fixed to the tissue. a laminate layer comprising a first portion consisting of less than a predetermined amount defined and supported thereon; a second layer comprising a second layer adjacent to and covering at least a central portion of the first major surface of the first layer; layer, superabsorbent distributed in the first absorbent layer adjacent to the first major surface of the first absorbent layer; a second portion of the polymer; The first and second layers are subjected to an embossing operation, and the first and second layers have a given density. Multiple groove regions and between groove regions consisting of compressed and physically integrated portions of layers with separated regions of parts of the first and second layers having a density less than a given density of Absorbent core resulting in a logically integrated absorbent core. 2. A substantially smooth pattern is embossed into the second major surface of the first absorbent layer and has a diamond shape. The absorbent core of claim 1, wherein the pattern is embossed into the second absorbent layer. 3. water-impermeable backing sheet, water permeable cover sheet, and placed between the cover sheet and the backing sheet and adjacent to the backing sheet a first layer of fluff, and at least one tissue adjacent to the fluff layer; layer and a layer comprising a superabsorbent polymer fixed to and supported by the tissue. an absorbent core comprising a second layer consisting of a laminate layer; The first and second layers are integrated by an embossing operation, and a portion of the first and second layers is separated regions with a given density and compressed parts of the first and second layers. yielding an absorbent core with groove regions having a density substantially greater than a given density. absorbent products. 4. 4. The absorbent article of claim 3, wherein the groove regions are arranged in a repeating diamond-shaped pattern. 5. The absorbent core further includes first and second tissue sheets, wherein the first tissue sheet a tissue sheet is placed between the first layer and the backing sheet, and the second tissue sheet is placed between the second layer and the top sheet, and the second tissue sheet is embossed. 4. The absorbent product of claim 3, which is operatively integrated into an absorbent core. 6. A method of manufacturing an integrated absorbent insert, the method comprising: first and second antagonists; preparing a layer of fluff for forming a surface, applying a small amount of liquid to a first major surface of said fluff; spraying onto at least one layer of tissue and a layer of laminate comprising a superabsorbent polymer supported on the first main body of the fluff layer; placing on a surface to produce an insert assembly; Embossing an insert assembly between the first and second embossing members to emboss the laminate. a compressed region in the fluff layer and adjacent the first surface thereof; The laminate layer becomes a fluff layer near the compressed area. a step of physically combining; method including. An embossed insert assembly is placed adjacent the second major surface of the fluff layer. a first sheet of tissue and a second sheet of tissue placed adjacent to the laminate; 7. The method of claim 6, comprising: 8. The first embossing member includes a flat embossing roll and the second embossing member includes a reverse embossing roll. 7. The embossing roll according to claim 6, comprising an embossing roll having an embossed part forming a double diamond pattern. Method. 9. The first embossing member includes a flat embossing roll and the second embossing member is 8. The embossing roll according to claim 7, comprising an embossing roll having an embossed part forming a double diamond pattern. Method. 10. water-impermeable backing sheet, water permeable cover sheet, and at least one layer of tissue disposed between the cover sheet and the backing sheet; A laminate containing a superabsorbent polymer fixed to and supported on a tissue and a tissue. a folded embossed absorbent layer containing a nate layer; , the absorbent layer is folded back into the center area to form a single thickness of laminate and into the center area. Made of absorbent material that constitutes a double thickness of laminate in each of two directly adjacent areas Goods. 11. water-impermeable backing sheet, water permeable cover sheet, and placed between the cover sheet and the backing sheet, and having first and second opposing major surfaces. a first layer comprising fluff having a first major surface disposed adjacent to the backing sheet; at least one sheet of tissue placed adjacent the second major surface of the fluff; a second layer consisting of an absorbent core comprising superabsorbent polymer powder; The first and second layers are integrated by an embossing operation, and a portion of the first and second layers is separated regions with a given density and compressed parts of the first and second layers. yielding an absorbent core with groove regions having a density substantially greater than a given density. absorbent products.