JPH01500361A - Elastic leg diaper and its manufacturing method and device - 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] Background of the invention of elastic membrane diaper and its manufacturing method and device The present invention provides a disposable bag with elastic legs and/or waist enclosing areas. The present invention relates to diapers, as well as methods and apparatus for manufacturing the diapers. above elastic The region is thermostable in its uncontracted form; it is relatively inelastic and thermostable in its heat-contracted form. It is made of a heat-shrinkable elastic material of a flexible and relatively elastic type.

In order to provide a relatively tight fitting effect around human body parts such as the wrist, waist, and thigh, Garments have been made in the past that have elasticized regions. At the beginning, and then further The above-mentioned elastic body is attached by sewing while maintaining it in a stretched state to the extent that It has been. When relaxed, the elastic body causes shirring or folding in the elastic area of the garment. Tsukushidasu. Sewing elastic is a relatively slow and expensive manufacturing operation. many episodes The bright minds have used their energy to discover ways to easily attach elastic bodies. the -For example, Gray (U.S. Pat. No. 1,544,312) mechanically pleats clothing. It uses a partially cured rubber rod that is heat cured after application.

Matsukei (U.S. Patent No. 2,905,181) is a polyvinyl chloride material that is impermeable to moisture. It uses a nitrile rubber band that is melt-sealed to the membrane.

Disposable diapers for infants have traditionally been the subject of much inventive activity to prevent leakage. That's six. A very successful outcome in this regard has been the use of box pulleys around the infant's thighs. It is to use

This type of diaper is described by Duncan et al. in U.S. Patent Reissue No. 26,152. It is stated. While this configuration represents a significant step forward, it remains It did not provide a completely satisfactory solution to the leakage problem.

Another proposal for an ultimate solution was proposed by Puel in U.S. Pat. No. 3,860,003. It is explained. This configuration was so successful that subsequent inventions in the field It has been imitated and improved by others. The following U.S. patents were developed after that time. This is an example of the results. Larne et al., No. 4,050,462, Strickland et al., no. No. 4,253.461, outside Jiggle, No. 4,437.860, and Teet 9 No. 4,405,397.

Strickland et al.'s product represents an advance beyond infant diapers and is primarily The product is intended for use by incontinent adults.

Char (U.S. Pat. No. 3,951,150) has an elastic region that surrounds the waist. This shows an infant diaper designed to reduce leakage from the product area.

The above list is mainly shown to show the historical development of diapers with elastic areas. It is not intended to be an all-inclusive list of products developed in this field. Above example All are normal, with a relatively narrow space glued between the back sheet and cover sheet of the diaper. Made of natural rubber ribbon elastic material. With normal flexible hot melt adhesive By using the bonding method, it is possible to produce elastic disposable diapers at high speed. came.

Later in the period indicated by the above patent, parallel approaches have been disclosed. These are uniaxially stretched into relatively thin films during fabrication. or based on a wide range of synthetic polymers that are biaxially oriented. This stretching action Stress was generated and the stress was maintained in a state where tensile force was applied in uniaxial or biaxial directions. When the product cools down, it is frozen into the product. These materials consist of the initial unstretched It retains the memory of its original dimensions.

Depending on the specific lima selected and its manufacturing method, the material must be heated to a specific predetermined temperature. This will result in shrinkage to approximately this original size. These polymer products are It can be easily made into an elastomeric material. The term "elastomeric" can be used in various ways. meaning that the product as a whole is at least approximately its original length. When it is stretched to 120-140% and the stretching force is released, it does not undergo permanent deformation. It shall mean that it is possible to return to the length. Many products available In its uniaxially or biaxially stretched thermally unstable form, it is relatively inelastic. It will not meet the above criteria. However, when these products are heat-shrinked, becomes sufficiently elastic. Many of these features of polymers also cause thermal shrinkage. This is the point at which it can be melt-sealed or bonded to other materials at temperatures below this point. this This means that the material can be used without being held under tension, making it an elastic garment. It is particularly useful for the production of To create an elastic region, simply heat it afterwards. That's fine.

Overall, a large number of polymeric materials of various types have been cited as effective in the above applications. However, the following U.S. patents should be considered illustrative. Outside Belin, no. No. 2,200,249; White, No. 2,953,551; Cook et al., No. 3; No. 086,242, Holden et al. No. 3,265,765; and Lin Ali et al. , No. 3.551,540.

The following British patents also disclose useful polymer compositions:

No. 866.819, No. 866.820, No. 866.821, No. 866.822, No. 1,010.064.

As shown in U.S. Pat. The first application was made in Mainland.

In this case, the inventor has developed a plastic pan having an elastic heat-shrinkable elastic membrane layer area. I'm making tsu. Mason has also shown other uses. Later, Aldo House was established in the United States. Patent No. 3,639,917 has been developed for other uses such as arm strength on disposable hospital plates. It shows how to use a shrinkable elastic ribbon. U.S. Patent No. Matusengel et al. No. 3,819,401, and Kotsuho et al. in U.S. Pat. No. 3,192,565. Method of using special heat-shrinkable materials to create elastic areas in garments such as panties It shows. Schirmar, in U.S. Pat. No. 3,755,062, describes To use fuzzy membranes to make bulky textile products such as non-woven rugs. Shows how to use.

Natural rubber is a relatively expensive product, and for the above reasons and other reasons, it is often used to make parts of clothing elastic. When used for is normal. The disadvantage of this configuration is that the area of the elastic part of the garment that touches the wearer's skin is They are often small and very narrow. Thus, if the purpose of the elastic region is If the purpose is to prevent leakage, as in the case of elastic leg diapers, the tight sealing effect It is necessary to maintain the elastic body under relatively high tension in order to provide . (However This often causes fraying and general discomfort to the wearer. . One solution to this problem is to use parallel narrow elasticity to increase the hit area. The idea was to use body pieces. A diaper with this type of structure is disclosed in U.S. Patent No. 4,43 You can visit No. 0.086 (Repuga). This method was effective, but additional It was expensive because it required a flexible elastic body. At the same time, it makes the production of the product considerably more complicated. . For this reason, designers of disposable diapers have chosen to use heat absorbers in the form of relatively wide ribbons. We moved toward increasing the contact area by using shrinkable elastomers.

Heat-shrinkable materials overcome the problems of cutting and fraying caused by narrow elastic bodies. became of interest to diaper designers as another way to . Started in 1980, heat-shrinkable elastic was placed in the hem area of disposable diapers. A significant number of patents have been issued directed to the use of flexible ribbons.

In some of the above patents, heat-shrinkable elastomers are used along the length of the leg region. It is only used as . In others it is only along the diaper transverse edge of the placement. not being used. In still other configurations, heat-shrinkable elastic is used in both positions. There is. Representative examples of disposable diapers using heat-shrinkable rubber strings are found in the following U.S. patents: be found. Lepke et al., No. 4,205,679 and No. 4.430.086. , outside Mesek, No. 4,324.245 and No. 4.352.355, Pienak. , No. 4,333,782, Pieniak et al., No. 4,337,771 and 4,4 No. 13,623, Ciarafa et al., No. 4.381,781, Sigur, No. 4,48 No. 6,192, Outside Kievit, No. 4,515,595, and Hipler 4, No. 563,185. The following UK patent applications are also of interest: Lassie, CB 2, 136.677 A, and outside Chapman, CrB 2.136,678~ All of the above patents use a separate ribbon of elastic material that is heat shrinkable. These are shapes, They differ greatly in location, mounting method and area over which they heat shrink.

The inventors of the above diapers have discussed suitable equipment for making them in any length. not present. When making an elastic leg diaper with an elastic body, the two ends are butted together during production. It is common practice to place the material under sufficient tension to prevent wrinkles at the edges. US special No. 4.081,301 (Zuel), No. 4. ．． No. 239.578 (Bore), No. No. 4.309.236, No. 4,325,372, No. 4,405,397 (Ti. No. 4,397,704 (Flick), and No. 4.371°417 (Outside the flick) is a device that inserts an elastic body along the longitudinal hem of a disposable diaper. This is an example of a patent. U.S. Pat. No. 4,412.881 (Sigur) and U.S. Pat. No. 4,227,952 (Sabii) is a method for measuring the length of a stretched elastic body in the longitudinal direction. 2 shows a device for insertion along the seam. Additionally, the following U.S. patents describe elastic inserts: A method and apparatus for inserting the diaper across the edge of the diaper that forms the waist region is shown. Ru. No. 3.844.288 (Kiera), No. 4,240.866 (Riga), No. 4 , No. 284,454 (Jiwa), No. 4,488,923 (Pienaku), and and No. 4.293.36 (Kurasev) is a longitudinal leg cut-off part of a disposable diaper. A method and apparatus for shaping an elastic body in a flexible manner are shown. This list is an example They are cited for reference only and are not intended to be all-inclusive. . None of the above patents insert an untensioned heat-shrinkable polymer ribbon and then It is not about heat treating.

Summary of the invention The present invention includes a region of heat-shrinkable elastomer material placed in the appropriate hem area of the diaper. for producing diapers with elastic leg and/or waist regions using METHODS AND APPARATUS.

These heat-shrinkable elastomeric materials are thermally unstable unless their shape is shrunk. It is relatively inelastic and becomes relatively elastic when it is heat-shrinked. that These are comprised of discrete strips placed along the appropriate hem area of the diaper. the The entire water-impermeable back sheet of the diaper is made of heat-shrinkable elastomer material. It is desirable that the

The present invention also uses heat-shrinkable elastomer material throughout the non-permeable backsheet of the diaper. wrapping a disposable diaper with elastic legs and/or lumbar hem area made of It can be thought of as a package.

The method of the present invention also allows continuous edge butting of diapers by joining individual diaper components. or a side butt composition, but an end butt relationship is desired. Delicious. Areas adjacent to adjacent diaper units are maintained under sufficient longitudinal tension. This will prevent wrinkles during manufacturing. Adjacent to adjacent diaper unit This area constitutes the portion of the diaper that surrounds the waist. The suitability of each diaper unit is The appropriate longitudinal edge region is heated to a high enough temperature to allow contraction of the elastomeric material. be done. Immediately thereafter, the longitudinal tension of the hesi is relaxed, while the central part of the composition is Tension is maintained. The tension in the hex causes the heated elastomer material to contract and cause it to re-open. By being kept in a relaxed state long enough to cool to a stable temperature, Creates an elastic hesi area on the top.

The main element of novelty of the present invention is to provide tension along the central portion of the diaper unit composition. While maintaining the tension, the tension is relaxed along the hem to allow the heated part to contract on its own. This is a unique point.

This is accomplished by rolling the roll over a series of rolls that are cylindrical in the center but tapered at each end. This is achieved by running the composition after heating. heated edges of the diaper The part extends the tapered part.

In this way, as the margins contract, they run over the tapered end of the roll. The circumferential distance traveled is also considerably smaller than the circumferential distance traveled by the center portion of the diaper composition.

Use a sufficient number of rolls to achieve the desired edge shrinkage and further heat the area until they become stable again. cooling to a constant point. At a certain point when this is established When the heat-treated, now elastic, hemi sections become stable again, they The composition can be stretched again if necessary as it passes further through the diaper making machine. Wear. Simultaneously or alternatively, the diaper may be heated transversely to create elastic regions. You can also start. This can be done by applying heat rolls or other means to the appropriate local area. It is preferable to do this by heating.

Individual diapers are cut from the diaper unit simultaneously with or immediately after the above heating. Ensure that any existing transverse tension is released. This makes the diaper The heat-treated edges of the knits shrink freely and finally they become heat-stable and elastic. This allows for sufficient cooling to occur. Instead, the diaper composition is can remain intact during contraction, and the transverse tension forces the composition between the two pairs. Loosen by other means, such as tightening between the wheels.

The Bakashi device and method just described is inserted into the diaper composition at an appropriate location. Can be used with edge ribbons of heat-shrinkable elastic material. However, the structure Creating a backing sheet made entirely of heat-shrinkable polymer material for ease of fabrication. is desirable. Heat only the hemi region to be made elastic so that it contracts as described above. It can be done.

The object of the present invention is to provide disposable diapers or similar products with elastic hem areas. An object of the present invention is to provide a method and apparatus for manufacturing.

Similarly, it is an object of the present invention to use a heat-shrinkable polymer material that becomes elastic after heat shrinking. By providing a method and apparatus for making a disposable diaper having a hem region be.

It is a further object of the present invention to relieve the tension on the upper part of the diaper unit while Heat dissipates the longitudinal edge areas by maintaining tension on the central portion of the mating composition. It is an object of the present invention to provide a method and apparatus for reducing the

It is further an object of the invention that the edges have two ends that allow for heat shrinkage of the heated area. An object of the present invention is to provide a diaper manufacturing machine having tapered rolls.

A further object of the present invention is that the entire backing sheet has an elastic edge area made of a heat-shrinkable Holima material. The objective is to provide new disposable diapers or similar products.

These and other purposes may be achieved by reading the following detailed description in conjunction with the drawings. It should be readily apparent to those skilled in the art.

Brief description of the drawing Figures 1, 3 and 5 show the disposable diaper of the present invention before heat shrinking the elastic region. 2, 4, 6 and 7, the elastic region is heated. The same example after shrinkage, Fig. 8 is a right side view of the disposable diaper manufacturing apparatus of the present invention, and Figs. 9 and 10 are its views. Detailed top and right side views of the longitudinal edge heat shrink station of the device, respectively; Figures 11 and 12 are right side views of two embodiments of the transverse edge heat shrink station of the device. Side view.

Description of examples It will be understood by those skilled in the art that the terms used in the following description are relative. be. Most disposable diapers and adult incontinence pads have a continuous end-to-end relationship. Can be assembled. In this case, the sides of the diaper that wrap around the wearer's upper thighs are long. It is in the hand direction. However, as shown for example in U.S. Pat. No. 4.284.454, It is also known to make sea urchin diapers as a continuous side-butted composition. this In this case, the end of the diaper, i.e. the part surrounding the waist, lies in the direction of longitudinal movement during manufacture.

Thus, the terms "longitudinal" and "transverse" are relative and should not be used in the text. It should not be thought of as being limited to one direction or the other.

Various embodiments of the invention can be easily understood by referring to the drawings. . Figure 1 shows the Omron, whose components have been completely assembled, but is still in an unfinished state. 2 is shown. This applies light tension to the body shape when they are edge-butted on the diaper making machine. It is the most commonly found form of diaper unit when added. that consists of an impermeable wood backing sheet 4, in this case a biaxially oriented heat-shrinkable thermoplastic It is a material. This support membrane is in this case relatively inelastic, thermolabile, non-shrinkable. It is depicted in autumn. When heat shrinks, it reaches 100% or more. It has ductile elasticity. The support sheet 4 is made heavy by a filling puff (8) of water-absorbing material. Being hit. This itself is covered by a water-permeable nonwoven top sheet 6. composition The entire body is glued together by a plurality of fine lines 9 of hot melt adhesive. That's it This diaper unit has a longitudinal edge 10 forming a crotch area surrounding the legs and a waistband. It has a longitudinal hem 12 disposed in the ground area.

The diaper further includes a transverse hem 14, which further defines the end of the waistband area. Form. Adhesive tape 16 completes the unit.

FIG. 2 shows that the longitudinal edge 10 is heat-shrinked in the region surrounding the legs to form an elastic section. The diaper of FIG. 1 is now shown. These ensure a tight fitting effect and are suitable for infants and adults This is important in preventing leakage when the user wears the product. The diaper in Figure 2 is long. Shown without restraint in the manual or transverse direction.

As a result, the heat-shrinkable edge region 18 has a folded or wrinkled edge and an associated transverse direction. It would be more likely to form those with opposite creases.

When applied to the wearer, the pleated edge 20 is given tension as a whole. The mat surface is again drawn reasonably flat.

The temperatures used to heat the longitudinal edges of diapers of the type shown in Figures 1 and 2 are depending on the specific polymer material used. These temperatures generally range from approximately 88° to 12° It will be in the range of 0°C. The degree of shrinkage thus obtained is due to the heating of the polymer material. It depends somewhat on the temperature at which it is held and how it is allowed to relax during cooling.

The above points will be discussed in considerable detail later.

An alternative method of making elastic leg diapers similar to those shown in Figures 1 and 2 is shown in Figures 3 and 2. It is depicted in Figure 4. In this case, similar numbers represent similar components in all drawings. Please note that The diaper shown in Figures 3 and 4 encloses the legs. A more traditional configuration similar to the one using elastic cord for the area. In this case, the support membrane is a normally insoluble colored polyethylene having a thickness in the range of 0.002 to 0.04 m. A more traditional material of film 5. In this case, the heat-shrinkable polyethylene material A longitudinal ribbon 22 is disposed along each longitudinal edge of the diaper. these are Generally speaking, the width ranges from about 10 to 15 cm, and the total length of the diaper as shown in Figure 3. run. Instead, they are parallel to the longitudinal edge 10 and surrounding It may also be discrete lengths of material placed in only one area. Figure 4 shows polymer tape The diaper composition of the diaper unit shown in FIG. 3 after being heat-shrinked along the edge region 10 shows. As a result, the heating area can be accommodated in the range of 50 to 80% of the original size in the longitudinal and transverse directions. It begins to shrink and create an elastic region 24. The end of the tape 22 located in the layer area of the diaper is Stay in the initial uncontracted shape.

Figures 5 and 6 are for creating an elastic area along the diaper area that surrounds the legs and waist. shows yet another modification of a diaper using heat-shrinkable 41J material. Furthermore, As shown in Figures 3 and 4, the support sheet is made of insoluble colored polyethylene. Conventional materials such as For this configuration, heat-shrinkable lengths of Material 26 is placed in each leg encircling area of the diaper. In the same way, place each diaper. A transverse heat shrinkable ribbon 28 is laid across. Omu of the type shown in Figure 5 The machines comprising the two are conventional up to this point. - e.g. longitudinal polygon The Malibon 26 is designed to be laid in disparate lengths of waste string. It can also be placed into the composition by any of these assembly machines. However, this When in place, ribbon 26 is unstretched. Cross ribbon 28 is USA By a machine such as that described by Frick in Patent No. 3.758.363, It would be convenient to use the same device. Figure 6 shows the longitudinal elastic region 30 and the transverse elasticity 2. The diaper unit of FIG. 5 is shown after the polymer ribbon has finished shrinking for release. vinegar. As shown in the example above, this results in pleats in the longitudinal edges 20. In addition, folds will also occur at the transverse edge portion 34. This configuration is for leg and waist placement Helps ensure a tight leak-proof attachment effect.

Figure 7 shows a diaper of similar construction to that shown in Figures 1 and 2; The entire support membrane is a heat-shrinkable thermoplastic polymer material. This rose again The arms and waist are both heat-shrinked to create an elastic area of 18.36 cm. did.

The method has additional important advantages as shown in FIG. Entire leg notch area It is very easy to make the transition region 21 elastic so that it also becomes elastic. Ru. This results in a tighter fit that covers the entire thigh area of the wearer. It will be done.

When manufacturing diapers having the shapes shown in Figures 1, 2, and 7, the manufacturer has great advantages. Hand inserting the laces into the longitudinal and transverse sides. The production machine becomes much simpler since no stages are required. The support membrane itself serves this purpose . However, in the case of heat shrinkage, especially in the longitudinal or machine direction, There is another complication that has not been fully resolved. As mentioned earlier, heat loss the tendency to prevent shrinkage after a shrinkable material has been heated to a temperature sufficient to cause such shrinkage It is necessary to remove any constraining tension. Diapers wrinkle during production. It is usually made under slight longitudinal tension to prevent this. child Tensile forces can also cause typing built into various mechanical components to become out of sync. This is necessary to avoid the consequences of incorrectly assembling the diaper components.

Also, while applying a longitudinal tensile force, unavoidably smaller This results in the creation of a transverse tension of a certain amount. Therefore, heat-shrinkable elastomer materials To use it effectively, it is necessary to satisfy competing demands. machine requirements In order to meet this requirement, tensile forces must somehow be maintained on the end-to-end diaper composition. Or, the tensile force is at least such that shrinkage can occur in any heating range. You must relax for a sufficient amount of time. Setting up the diaper manufacturing machine according to the present invention gauges are more competitive when they are subjected to heat shrinkage in both the longitudinal and transverse directions. I succeeded in meeting the demands.

Figures 8 to 12 show a machine suitable for manufacturing diapers similar to those just ordered. The machine is shown, and FIG. 8 is a general view thereof. In this case, impermeable support sheets 4 is taken off from the supply roll 7 by a feed roll 40.41. Hotmelt A fine line pattern of the adhesive 9 is applied to the support sheet using the applicator 38. You can do it. If the support membrane is a heat-shrinkable material and is often placed on the edges of such material, Applying the placed longitudinal ribbon 22 to the support sheet between the rolls 40, 41 Can be done. Instead, a flexible adhesive applied by applicator 39 is used. If this is not the case, the fine line 9 of the adhesive will give the same effect. It is also possible to create a large adhesive area between the bond 22 and the support sheet 4. . Another option is to heat seal at a temperature below that at which sufficient shrinkage occurs. Heat-shrinkable membrane 22 could also be bonded by ringing. ultrasonic welding Other adhesive techniques such as This is the case if separate ribbons are used within the diaper construction. Heat shrinkable if required The ribbon 22 may be applied to the cover sheet 6.

The support material 4, now fitted with the ribbon 22, is placed in the diaper structure between the pressure rolls 46, 48. The component parts assembly conveyor 44 is entered. Water permeable topsheet 6 and water absorbency in this regard Pad 8 is combined with a support sheet. pads 8 as they advance onto conveyor 42. When entering the market, it was preformed and cut into various units. End protrusion of diaper unit 2 The combined composition moves along conveyor 44 and finally encounters counter rolls 50,54. cormorant. A roll 50 engages each longitudinal edge of the diaper unit within the leg encircling area. A pair of heating shields 5-52 are provided. These heating shoes are heat shrinkable The thermoplastic membrane will normally be heated to a temperature of at least 80°C.

Instead of the structure in the drawing 9, a roll is used together with a heating shoe 52 and a backup roll 54. 50 is reversed so that heat is directly applied to the support film.

Immediately after leaving the heated area on the diaper 44, the diaper composition undergoes longitudinal shrinkage. Skip over multiple rolls. There are usually at least three such rolls (56, 58, 60) used, but with extra protection for shrinkage and cooling until thermal stability is achieved again. More rolls can be used if more time is required. B The central part of the roll 56, 58, 60 is generally cylindrical, but each end is tapered. It has become. This structure can best be seen in FIG. pass over Ronil Normal tension is maintained in the center or /ζζrad region of the diaper composition during .

However, the now heated longitudinal heel region is stretched over the tapered portion of the roll. It is free to contract until the point where the tapered portion of the roll meets. If the leg encirclement area If the area is to be contracted by 50% of its original longitudinal dimension, the edge area should be The circumference of the tapered part that is restrained is half of the circumference of the center part of the roll. It is possible. The use of these double tapered rolls is the core of the method and apparatus of the present invention. It is the heart. Competing forces to maintain longitudinal tension and relax edge tension It is these roles that allow us to meet our needs.

After the hem region of the end-butted diaper compositions shrinks and becomes heat stable again, they Roll 64, which serves to maintain tension on the unit from the double tapered rolls. 66 onto the additional conveyor 62. The roller 68 at the discharge end of the roller 62. 70 serves a similar purpose.

If the waist area of the diaper is also intended to be elastic, they should be rolled at this point. It will pass between 72.78. The roll 72 is located at the end of the diaper unit or A high temperature shoe 74 is timed to engage and heat the cross section. Ru. This roll also has a cutting knife 76, in which case the roll 78 is Acts as a bill roll. Instead, the cutting knife is 70.72 It can also be placed on a separate roll 77 placed immediately after (FIG. 12).

The now cut individual diapers 3 are transferred to another diaper 80 between the rolls 82, 84. Move up. Conveyor 80 moves at a somewhat faster speed than conveyor 62. Therefore, the diapers are separated at small intervals. The restraining force on diaper 3 is is released while traveling on the conveyor 80. At this point, the edge has a stable elastic state. Free to shrink and cool. Diapers are not shown from conveyor 80. However, they are moved to conventional machines where they are folded and packaged.

A preferred embodiment of the present invention uses a heat-shrinkable thermoplastic membrane for the entire diaper support membrane. in the longitudinal direction as used in the embodiments shown in Figures 5 and 6. Or use transverse heat shrinkable inserts. However, crossing If it is desired to use the insert 28, the individual components may be These can be placed in any convenient position before assembly on the layer 44. . As noted above, the dosage for carrying out this process is conventional. crossing in Cert is between 40.41 and 46.48 on the composition row on conveyor 44. It may be convenient to apply it to the support membrane 4o at a fixed point. Many other such transformations It will be obvious to those skilled in the art that various modifications can be made.

Example The various components used in the manufacture of infant or adult incontinence pads are It is well known in the industry. Water-permeable top or body contact sheets are common. With a basic weight in the range of 18 to 261/m2, patterned calender rows latex adhesive with 2-5 denier continuous fibers thermally bonded to or carded polyester with spunbonded polypropylene It is usually fiber. As an example of the above Nori N Eve, each Scotto 68 22 (Hansylvania, Philadelphia, Scotstober ξ Company, Woven Products Division) and Celestra (Crown Zeller, Wausegal, Washington) (available from Bach & Co.). Impermeable diaper support sheet is 0.02 Low density polyester with a thickness in the range of ~0.04+m (0.75-1.5 mil) It can be a tyrene film. This material holds the mounting tape well. It is often stamped with a cyclo-type. Examples of such conventional support materials include Shinati and Kuro are probably Icode 53, which are commercially available from Lee Company.

Support membranes are thermally unstable and relatively inelastic when their shape is not contracted; Biaxially oriented heat-shrinkable elastomers of the type that are stable and relatively elastic in their heat-shrinkable form. Preferably, it is a stoma material. This is the entire support sheet or the hem of the support sheet. It can be used for any ribbon-like insert along the length. It takes One example is the cryostat of Duncan, W.R., Brace, Inc., Salas California. The product is Liovac 5DX-0820, which is available from the Vac department. this material is a biaxially stretched radiation that generally becomes heat shrinkable at temperatures within the range of 80-95°C. It is irradiated polyethylene. The unrestrained shrinkage after heating this material to the above temperature range is The total size will be approximately 50% of the original size.

Lower degrees of shrinkage could be achieved in one of several ways. model It may be appropriate to control the amount of stretching during formation.

- As a row, it is only necessary to create an elastic leg opening area on the diaper In such cases, axis-oriented films are usually quite suitable. Film heating temperature Another way in which shrinkage can be controlled is by controlling the subsequent cooling rate. It is.

Flexible fast curing Hoctomelt adhesive for bonding separate heat shrinkable ribbons or compositions It can be used as a fine line adhesive to unite the whole. However, ethylene-vinyl acetate used with tackifiers and other additives It is usually formed from resin. These adhesives are slightly tacky at room temperature. It has a tendency to be flexible. One suitable material for this is type HL10 48N, available from H.B. Fuller Company, Virginia Heights, Minnesota. .

Instead of conventional polyethylene, the above Cryovac material can be used as a water-impermeable support membrane. A large infant diaper was manufactured using the same method.

These diapers had a length of 495+ m, a width of 337 m, and a total weight of 72 g. pa 0.07~0.089/cW? Fluffy bleached with a density in the range of kraft softwood pulp. The support membrane had a thickness of 0.015 mm+ . The membrane has a tensile strength that is comparable to that of the ordinary low-density polyethylene used as the support material. It is possible to make the tangle thinner, which is approximately twice that of the tangle. Assemble the diaper as usual It was. After this, the longitudinal edges are heated to a temperature of approximately 95°C over a width of approximately 10 mm. It was made to heat and shrink. After that, the width of the diaper in the transverse direction is about 15m. It was then heated to a slightly lower temperature over a period of time to allow it to shrink freely. Final The diaper has approximately 40% ductility in the waist region and approximately 100% ductility in the leg region. had.

Various changes can be made by those skilled in the art without departing from the spirit of the invention. This should be readily apparent.

Accordingly, the invention should be considered limited only by the scope of the following claims. be.

Procedural amendment (formality) 6. person who makes corrections Relationship to the incident: Applicant address pir'h'yniΔ'-ha''?7fゝ・Kantsmany 4, Agent international search report lnmna+1anal Alpl, cal+w m, fcr/11!861 02505

Claims (22)

[Claims] 1. A water-permeable cover sheet that comes into contact with the skin, a non-water-permeable support sheet, and both of the above. A method of making a type of disposable diaper having a water-absorbent filling pad disposed between the diapers. , the individual diaper components are brought together to form a continuous end of the diaper unit. forming a face-butted or side-butted composition, at least in the longitudinal direction of the diaper composition; Along one edge, it is thermally unstable and relatively inelastic when not contracted, and stable when contracted. providing a region of heat-shrinkable elastomeric material of a type that is constant and relatively elastic; Sufficient longitudinal tensile force to prevent wrinkle formation on the diaper unit composition maintain, A region of heat-shrinkable elastomeric material on the longitudinal edges of each diaper unit within the composition. heating the elastomeric material to a temperature sufficient to allow contraction; While the longitudinal edges of the diaper unit are then immediately heated, the tensile force is relaxed. The elastomer material in the center of the diaper unit shrinks and cools to a stable concentration. of the hem on the diaper by maintaining the tension for a sufficient period of time to allow Creates an elastic region, The method, characterized in that it consists of steps. 2. Immediately after heating the peripheral portion, the diaper unit composition is formed so that its central portion is cylindrical and each end is heated. by passing it over a series of tapered transversely stretched rolls. The longitudinal edge of the diaper composition protrudes into a tapered end and extends over the diaper unit composition. The distance traveled by the longitudinal edge is such that the tension on the longitudinal edge is relaxed. The feature is that the distance traveled by the central part of the Mutsu unit is also sufficiently small. A method according to claim 1. 3. A claim characterized in that the roll is provided with at least three tapered ends. The method described in item 2 of the scope of the request. 4. A separate piece of heat-shrinkable elastomer material runs along each longitudinal edge of the diaper unit. A method according to claim 1, characterized in that the method is arranged as follows. 5. Claims characterized in that the entire support sheet is comprised of a heat-shrinkable elastomeric material. The method described in Scope No. 1. 6. Because the diaper units in the composition are in an end-to-end relationship, The longitudinal edge of the unit corresponds to the leg surrounding area and is adjacent to the adjacent diaper unit. Claim 1, characterized in that the area forming the waist-encircling portion of the diaper Method described. 7. The waist surrounding area of the diaper is devoid of filler pads, and the waist surrounding area of each diaper unit is further a region of heat-shrinkable elastomeric material in at least one of the waist-encircling regions; After the elastomer material has shrunk in the marginal region, heat the heat-shrinkable material in the waist region. , the heating of the elastomeric material relaxes any transverse tensile forces present. Diaper by allowing the material to shrink and cool to a stable temperature 7. A method as claimed in claim 6, characterized in that it creates an elastic waist region. 8. Furthermore, the continuous composition may be separated into individual diaper units at the same time or immediately after the heating. 8. A method as claimed in claim 7, including the step of cutting the knit. 9. a separate piece of heat-shrinkable elastomeric material is disposed within the waistband; The method according to claim 7. 10. characterized in that the entire diaper support sheet is made of heat-shrinkable elastomer material 9. The method according to claim 8. 11. a water-permeable skin-contact cover sheet, a non-water-permeable support sheet, and a water-permeable support sheet disposed between the two; a heat-shrinkable material on at least one edge thereof in combination with a water-absorbent filling pad placed on the In an apparatus for manufacturing a disposable diaper having an area of elastomeric material of Diaper uniform with cover sheet and support sheet and filling pad and heat shrinkable elastomer material Hands for assembling and assembling pieces into continuous end-butt or side-butt compositions a step and a means for maintaining longitudinal tension on the diaper unit composition; The longitudinal edges of each diaper unit in the area of heat-shrinkable elastomeric material are means for heating the stoma material to a temperature sufficient to enable contraction of the stoma material; While relaxing the longitudinal edge tension on the diaper unit composition, A roller provided immediately after the heating means to maintain it in the center of the diaper unit. A series of transverse rolls that are generally cylindrical in the center and tapered at the ends by means of consisting of; The diaper edge portion extends over the tapered portion when the composition is passed over the roll means. The distance traveled by the edge of the diaper unit is smaller than the distance traveled by the center portion of the diaper unit. Because of this, the heated region contracts to an unrestrained state and cools to a stable thermally contracted state. The device is characterized in that it creates an elastic area of the hem on the diaper. 12. the roll means comprises at least three tapered end rolls; 12. The device according to claim 11, characterized in that: 13. The diaper component composition means forms an end-to-end composition of the diaper unit. This allows the area adjacent to the adjacent diaper unit to include the waist surrounding portion of the diaper. 12. The device according to claim 11, characterized in that: 14. Heat-shrinkable elastomer in at least one of the waist surrounding areas of each diaper Lateral for heating the material to a temperature sufficient to allow contraction of the elastomer material above. The elastomer material is heated, contracted, and heated continuously along its longitudinal edges by insulation heating means. and one placed sufficiently downstream to follow the heating means and cooling. The heated transverse direction relaxes any transverse tensile forces on the mat composition. and means for allowing the elastomeric material to shrink and cool while unconstrained. 14. A device according to claim 13, characterized in that: 15. further comprising a transverse cutting means disposed adjacent to the transverse heating means; Individuals from the continuous composition may be removed from the continuous composition at the same time or immediately after being exposed to the transverse heating means. The device according to claim 14, characterized in that each diaper unit is cut. Place. 16. Transverse heating means for heating both waist surrounding areas of each diaper unit 16. A device according to claim 15, characterized in that it comprises: 17. A water-permeable cover sheet that comes into contact with the skin, a water-impermeable support sheet, and the space between the two. A generally rectangular longitudinal leg contact edge with an absorbent filler pad located on the In the disposable diaper, the disposable diaper has a waist surrounding area in the transverse direction. The supporting sheet is thermally unstable, relatively inelastic, and heat absorbing when in its entirety in its uncontracted state. Made from a type of heat-shrinkable elastomeric material that is stable and relatively elastic in the compressed state. and the water-impermeable support sheet provides an elastic area for at least one part of the diaper. The diaper is characterized in that it is heat-shrinkable in a region along one edge. 18. At least an area adjacent to each longitudinal edge of the diaper is heat-shrinked. The use according to claim 17, characterized in that it is provided with an elastic leg area on the top. Disposable diapers. 19. The area adjacent the at least one transverse waist-encircling edge of the diaper is heat-shrinkable. 19. A disposable according to claim 18, characterized in that it provides an elastic waist region. Diaper. 20. The area adjacent to the edges surrounding both hips in the transverse direction has a heat shrink area. 19. The disposable diaper according to claim 19. 21. The area adjacent the at least one transverse waist-encircling edge of the diaper is heat-shrinkable. 18. A disposable according to claim 17, characterized in that it provides an elastic waist region. Diaper. 22. A region adjacent to both waist surrounding regions in the transverse direction has a heat shrinkage region. The disposable diaper according to claim 17.