Underpants type paper diaper and preparation method thereof

Abstract

The invention relates to an underpants type paper diaper and a preparation method thereof in the field of disposable hygienic products, the underpants type paper diaper comprises an absorption main body and an outer packing body, a liquid-permeable surface layer material of the absorption main body is a composite surface layer material, and the composite surface layer material is formed by connecting at least two layers of non-woven fabrics through connecting points. The upper-layer non-woven fabric is provided with protruding parts protruding upwards from the joint points, the protruding parts and the joint points are alternately and regularly arranged, the inner sides of the protruding parts are sprayed with camellia oil slow-release capsules, and flow guide holes smaller than the joint points are formed in the joint points. In the process of using the underpants type paper diaper provided by the invention, the camellia oil sustained-release capsules on the inner sides of the convex parts of the liquid-permeable surface layer can be released, so that the skin of a wearer can be effectively moistened, a sebum film on the surface of the skin can effectively exist, and adverse reactions such as allergy, chapping, roughness, diaper rash and the like are reduced.

Description

Technical Field

[0001] The invention relates to a panty-type diaper, in particular to a panty-type diaper with an improved composite surface layer. Background Art

[0002] A disposable panty-type diaper, such as baby diapers, adult diapers, women's menstrual pants, etc., is well known. The main function of this type of disposable diaper is to absorb and contain body excrement. This type of product is also used to prevent the body excrement from soiling, wetting or otherwise contaminating clothing or other items in contact with the wearer, such as bedding.

[0003] Diapers generally have a three-dimensional design and the entire waist area is elastic. Currently, most pull-on pants have an elastic waist as a separate part, which is made of two layers of non-woven fabrics and a glue-sprayed elastic stretchable part, which is then cut into the front waist and back waist parts, and then the front and back waist areas are separated and then joined with the absorbent body.

[0004] Pant-type diaper wearable articles are those that are put on by inserting the wearer's legs into the leg openings and pulling the pant-type diaper into position around the wearer's lower torso. Pants-type absorbent articles have become popular for children who are able to walk and are often toilet training, and for wearers who become more physically active, making the application of adhesive-type absorbent articles more difficult.

[0005] Diapers wrap around the wearer's skin to form a closed environment. The wearer urinates and defecates frequently. When urine and feces accumulate in the diapers, bacteria begin to grow and multiply. The bacteria irritate the wearer's delicate skin, causing eczema, red buttocks and other adverse conditions. As people's living standards improve, their requirements for quality of life gradually increase. Antibacterial materials have been widely used to remove bacteria or harmful organic matter in water or air, as well as for cleaning or disinfection in places such as medical centers. The research on new antibacterial materials has also become a hot topic, but the antibacterial materials currently developed have certain limitations.

[0006] The diapers currently on the market mainly focus on the absorption and drying of liquids, but rarely involve how to protect the sebum on the surface of the wearer's skin. The diapers on the market cannot be used to protect the skin of infants, and after long-term use, they will cause dryness, roughness, diaper rash and other adverse phenomena. Summary of the invention

[0007] The present invention aims to overcome the problem that existing diapers cannot protect the delicate skin of the wearer and will cause dryness, roughness, diaper rash and other undesirable phenomena after long-term use, and provides an underpants-type diaper that can effectively protect the wearer's skin.

[0008] Another object of the present invention is to provide a pant-type diaper with faster liquid transfer absorption.

[0009] To achieve the above-mentioned purpose, the present invention provides a panty-type diaper, which includes an absorbent body and an outer body, wherein the absorbent body has a liquid-permeable surface layer material, a liquid-impermeable bottom layer, and an absorbent core layer located between the liquid-permeable surface layer and the liquid-impermeable bottom layer, and the absorbent body has a front waist piece, a crotch piece, and a back waist piece in the longitudinal direction, and the absorbent body also has longitudinal side edges and transverse end edges, the front waist piece and the back waist piece in the absorbent body are not directly connected, the liquid-impermeable bottom layer of the absorbent body is joined to the outer body, the outer body has a front area, a crotch area, and a back area, and the two side edges of the outer body along the longitudinal direction are The side sealing part formed by the joining of the front outer body and the rear outer body, the annular outer body thus formed, and the panty-type diaper with a waist opening and two leg openings are characterized in that: the liquid-permeable surface layer material of the absorption body is a composite surface layer material, the composite surface layer material is composed of at least two layers of non-woven fabrics joined together by a joining point, the gram weight of the upper non-woven fabric is heavier than that of the lower non-woven fabric, the upper non-woven fabric has a protrusion protruding upward from the joining point, the protrusion and the joining point are arranged alternately and regularly, camellia oil sustained-release capsules are sprayed on the inner side of the protrusion, and a guide hole smaller than the joining point is provided at the joining point.

[0010] According to the present invention, there is provided a pant-type diaper, wherein the liquid-permeable surface material is optionally composed of three layers of nonwoven fabrics joined together by joining points, the middle layer of nonwoven fabric has a high bulkiness, and the upper and lower layers have a low bulkiness.

[0011] According to the present invention, a panty-type diaper is provided, wherein the area of ​​the flow guide holes of the liquid-permeable surface layer material is 0.2-0.7 times the area of ​​the junction, and the flow guide holes of the upper fluffy non-woven fabric are larger and the flow guide holes of the lower non-woven fabric are smaller. Preferably, the area of ​​the flow guide holes of the liquid-permeable surface layer material is 0.3-0.7 times the area of ​​the junction.

[0012] According to the present invention, a panty-type diaper is provided, wherein the camellia oil sustained-release capsule uses high molecular weight polysaccharide chitosan and sodium alginate as the outer wall of the sustained-release microcapsule, uses methyl cellulose as the inner wall of the sustained-release microcapsule, and the camellia oil is embedded in the sustained-release microcapsule. The preparation method of the camellia oil sustained-release capsule is as follows: ① weigh 1-2 parts by weight of methyl cellulose and dissolve it in 100 parts by weight of deionized water, and then add 1 part by weight of camellia oil to obtain a methyl cellulose-camellia oil solution; ② weigh 1-2 parts by weight of chitosan and dissolve it in 100 parts by weight of deionized water, mix well and add it to the aqueous solution of step ①; ③ weigh 12-20 parts by weight of sodium alginate and dissolve it in 100 parts by weight of deionized water, mix well and add it to the aqueous solution obtained in step ②, and ④ spray dry to obtain camellia oil sustained-release capsules.

[0013] According to the present invention, a pant-type diaper is provided, wherein the absorbent core layer comprises long fibers, short fibers and a superabsorbent polymer, the long fibers wrap a mixture of the short fibers and the superabsorbent polymer, the absorbent core layer is formed by stacking at least two layers, the upper layer comprises 40-70wt% of long fibers, 30-50wt% and 1-5wt% of superabsorbent polymers, and the lower layer comprises 30-50wt% of long fibers, 40-50wt% and 5-15wt% of superabsorbent polymers.

[0014] A method for preparing underwear-type diapers based on the same inventive concept comprises the following steps: (1) a step of making a liquid-permeable surface layer, ① a shaping step of giving a concave-convex shape to an upper layer material by meshing and biting between a first roller and a second roller, ② after shaping, the upper layer material is tightly attached to the outer peripheral surface of the first roller by the suction of the suction holes of the tooth grooves of the first roller, and the state of giving the concave-convex shape is maintained; ③ a step of positioning and spraying camellia oil sustained-release capsules onto the upper layer material in the tooth grooves of the first roller when the feeding roller is in meshing position with the first roller; ④ a step of positioning and spraying the upper layer material on the first roller The outer peripheral surface of the upper layer material and the lower layer material are overlapped with each other while continuing to be tightly attached to each other, and the overlapped upper layer material and the lower layer material are partially joined together between the first roller and the receiving roller to form a joint point; ⑤ The cutting knife of the perforated cutting roller performs a hole cutting process on the middle of the joint point of the composite liquid-permeable surface layer; (2) the step of making the absorbent body, compounding the liquid-permeable surface layer, the absorbent core layer and the liquid-impermeable bottom layer together; (3) the step of making the outer component, ① the outer layer nonwoven fabric is conveyed in the transverse direction, and the outer layer nonwoven fabric has a front area, a crotch area and a back area connected in sequence along the CD direction; ② The first elastic band applying device applies a plurality of first elastic bands with glue to the front and rear areas of the outer non-woven fabric, and the first elastic bands are arranged horizontally in a linear, wavy or rack shape; the second elastic band applying device applies a plurality of second elastic bands with glue to the crotch area of ​​the outer non-woven fabric, and the second elastic bands are arranged along the crotch opening in a wavy or rack shape; ③ The inner non-woven fabric is transported in the horizontal direction, laminated on the first elastic band, the second elastic band and the outer non-woven fabric, and the excess part of the leg circumference is cut off; (4) The absorbent body is laminated to the outer component to form a continuous underwear-type diaper body; (5) The underwear-type diaper body is folded in the middle of the length direction to form a When the front and rear pieces of the underwear-type diaper body are folded, the support device is used to support the underwear-type diaper body in the folding process, so that the front and rear pieces are spaced apart during the folding process, and the front and rear pieces are bent into an arc shape; the underwear-type diaper body is folded along the crease groove, and the folded underwear-type diaper body is rolled once and then rolled twice. A folding and forming device for achieving a stable crease is provided between the first rolling and the second rolling, so that the outer side surfaces of the front and rear pieces are rolled to form a crease between the front and rear pieces; (6) the underwear-type diaper body is welded and cut to form an underwear-type diaper.

[0015] According to a panty-type diaper provided by the present invention, the inner side of the raised part of the liquid-permeable surface layer is sprayed with camellia oil sustained-release capsules, and the camellia oil sustained-release capsules have a certain sustained-release effect on camellia oil. The amphiphilicity of cellulose avoids the use of small molecule surfactants and increases the safety of camellia oil microcapsules. The hydrophilicity of the outer wall material has an important influence on the storage stability of the sustained release. Reducing the hydrophilicity of the outer wall material and the environmental humidity will help to extend the shelf life of the camellia oil sustained-release capsules. According to a preparation method of a panty-type diaper based on the same inventive concept of the present invention, the camellia oil sustained-release capsules can be precisely positioned and sprayed on the inner side of the raised part of the liquid-permeable surface layer. In the process of using the panty-type diaper provided by the present invention, the camellia oil sustained-release capsules on the inner side of the raised part of the liquid-permeable surface layer can be released, thereby effectively moisturizing the wearer's skin, so that the sebum film on the skin surface can effectively exist, reducing adverse reactions such as allergic dry cracking, roughness, and the generation of diaper rash. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A three-dimensional diagram of an embodiment of an underpants-type diaper provided by the present invention; Figure 2 A schematic diagram of unfolding a panty-type diaper provided by the present invention; Figure 3 for Figure 2 A transverse cross-sectional view of the waist region; Figure 4 A schematic diagram of a composite surface material of a panty-type diaper provided by the present invention; Figure 5 for Figure 4 M-M direction cross-sectional view; Figure 6 for Figure 4 N-N direction cross-sectional view; Figure 7 Another schematic diagram of a composite surface material of a panty-type diaper provided by the present invention; Figure 8 A schematic diagram of the process of a composite surface material for a panty-type diaper provided by the present invention; Fig. 9 It is an enlarged schematic diagram of the gear teeth of the first roller; Fig.10 This is a partially enlarged schematic diagram of the feeding roller.

[0017] In the figure, 1 is a panty-type diaper, 2 is an absorbent body, 3 is a liquid-permeable surface layer, 31 is an upper material, 32 is a lower material, 33 is a junction, 34 is a guide hole, 35 is a protrusion, 36 is a camellia oil sustained-release capsule, 4 is an absorbent core layer, 41 is an upper absorbent core layer, 42 is a lower absorbent core layer, 5 is a liquid-impermeable bottom layer, 6 is an outer body, 6A is a front outer body, 6B is a crotch area, 6C is a rear outer body, 61 is a waist area, 62 is a lower waist area, 63 is an abdominal area, 64 is a lower abdominal area, 65 is a first elastic band, 66 is a second elastic band, 67 is an inner layer of the outer body, 68 is an outer layer of the outer body, 7 is a side seal, 8 is a waist opening, 9 is a leg opening, 11 is the first roller, 111 and 112 are the teeth of the first gear, 113 is the adsorption hole, 12 is the second gear, 13 is the feeding roller, 131 is the teeth of the feeding roller, 132 is the feeding hole of the feeding roller, 135 is the feeding chamber, 136 is the feeding hole of the feeding roller, 14 is the receiving roller, 15 is the punching cutting roller, 151 is the cutting knife of the punching cutting roller, 152 is the waste adsorption channel of the punching cutting roller, 153 is the waste adsorption chamber, and 16 is the receiving roller. Implementation

[0018] The present invention is further described below through specific embodiments. The present invention provides a disposable pant-type diaper, which usually needs to be placed around the crotch of the wearer during use. The disposable pant-type diaper has a longitudinal direction and a transverse direction after the side seals are removed and unfolded. The term "longitudinal direction" used herein refers to an imaginary direction of the diaper, which is consistent with the length direction of the diaper; the transverse direction is orthogonal to the longitudinal direction, which is consistent with the width direction or waist direction of the diaper. The disposable pant-type diaper has a front waist circumference, a crotch area, and a rear waist circumference in its longitudinal direction. When in use, the front waist circumference is set to face the user's abdominal area and downward toward the groin area, while the crotch area is set to be basically directly below the user's crotch, and the rear waist circumference is set to face the user's buttocks. Example 1

[0019] like Figure 1-3 As shown, a disposable underpants-type diaper provided according to the present invention comprises an absorbent body and an outer body, wherein the absorbent body comprises a liquid-permeable surface layer material, a liquid-impermeable bottom layer and an absorbent core layer located between the liquid-permeable surface layer and the liquid-impermeable bottom layer, and the absorbent body comprises a front waist panel, a crotch panel and a rear waist panel in the longitudinal direction, and the absorbent body also comprises longitudinal side edges and transverse end edges, the liquid-impermeable bottom layer of the absorbent body is joined to the outer body, the outer body comprises a front region, a crotch region and a rear region, side sealing portions are formed by joining the front outer body and the rear outer body at the two side edges along the longitudinal direction of the outer body, thereby forming an annular outer body, and an underpants-type diaper having a waist opening 8 and two leg openings 9.

[0020] like Figure 4-7 As shown, the liquid-permeable surface layer material 3 of the absorbent body 2 is a composite surface layer material, which is joined together by an upper non-woven fabric material 31 and a lower non-woven fabric material 32 through a joining point 33. The upper non-woven fabric has a protrusion 35 protruding upward outside the joining point 33. The protrusion 35 and the joining point 33 are arranged alternately and regularly. Camellia oil sustained-release capsules 36 are sprayed on the inner side of the protrusion 35, and a guide hole 34 smaller than the joining point is provided at the joining point 33. The guide hole 34 smaller than the joining point is provided at the joining point 33 to quickly infiltrate the urine discharged by the wearer into the absorbent core layer, thereby improving the dryness of the liquid-permeable surface layer.

[0021] Camellia oil sustained-release capsules use high molecular weight polysaccharide chitosan and sodium alginate as the outer wall of sustained-release microcapsules, and methyl cellulose as the inner wall of sustained-release microcapsules, and camellia oil is embedded in the sustained-release microcapsules. Methyl cellulose is the inner wall of the microcapsules to increase the compatibility of essential oils with the wall material. Sodium alginate and chitosan are on the outside of methyl cellulose to play a further protective role. Chitosan forms a composite membrane with methyl cellulose through hydrogen bonding, and the lower base of sodium alginate and the amino group of chitosan form the outermost layer of the essential oil microcapsule through electrostatic interaction. The ratio of sodium alginate and chitosan (12-20): (1-2) is conducive to forming a stable membrane structure. The preparation method of the camellia oil sustained-release capsule is as follows: ① weigh 1-2 parts by weight of methyl cellulose, dissolve it in 100 parts by weight of deionized water, place it in a magnetic stirrer and stir for 0.5-1 hour, then add 1 part by weight of camellia oil to obtain a methyl cellulose-camellia oil solution; ② weigh 1-2 parts by weight of chitosan, dissolve it in 100 parts by weight of deionized water, place it in a magnetic stirrer and stir for 0.5-1 hour, then add it to the aqueous solution of step ①; ③ weigh 12-20 parts by weight of sodium alginate, dissolve it in 100 parts by weight of deionized water, place it in a magnetic stirrer and stir for 0.5-1 hour, then add it to the aqueous solution obtained in step ②, and ④ spray-dry to obtain the camellia oil sustained-release capsule.

[0022] The camellia oil sustained-release capsule particles obtained by the method provided by the present invention are relatively uniform, smooth in surface, and endowed with the fragrance of camellia oil. The sustained-release capsule has a certain sustained-release effect on camellia oil. The amphiphilicity of cellulose avoids the use of small molecule surfactants, increases the safety of camellia oil microcapsules, and simplifies the preparation process of sustained-release capsules. The hydrophilicity of the outer wall material has an important influence on the storage stability of the sustained release. Reducing the hydrophilicity of the outer wall material and the environmental humidity will help to extend the shelf life of the camellia oil sustained-release capsules. During the use of the underwear-type diapers provided by the present invention, the camellia oil sustained-release capsules on the inner side of the raised portion of the liquid-permeable surface layer can be released, thereby effectively moisturizing the wearer's skin, so that the sebum film on the skin surface can effectively exist, reducing adverse reactions such as allergic dryness, roughness, and the formation of diaper rash.

[0023] Both crude and refined camellia oil can inhibit bacterial growth at lower volume concentrations, and the antibacterial effect is less affected by pH and temperature. Between pH 4-9, camellia oil has a good antibacterial effect, and its antibacterial effect is not affected at body temperature. The components of camellia oil that inhibit microorganisms are highly stable.

[0024] Reference Figure 8 The process schematic diagram shown in the figure illustrates the manufacturing process of the composite surface layer material of the scheme of the present invention. The manufacturing device of the scheme of the present invention has a first roller 11 whose outer circumference is formed with staggered concave-convex arranged gear teeth, and a second roller 12 whose outer circumference has a concave-convex shape that matches the shape of the first roller 11. The concave-convex parts of the roller outer circumferences of the first roller 11 and the second roller 12 are configured in a meshing state. The feeding roller 13 and the second roller have substantially the same gear teeth, and the tooth height of the feeding roller 13 can also be smaller than the tooth height of the second roller. A feeding hole 132 is provided on the gear teeth 131 of the feeding roller 13, and the feeding hole 132 is connected to the feeding chamber 135 through the feeding hole 136 of the feeding roller 13. The feeding roller 13 and the first roller 11 are configured in a meshing state with the concave-convex parts of their roller outer circumferences. The top of the convex part of the outer circumference of the first roller 11 is configured in contact with the outer circumference of the receiving roller 14. The cutter 151 of the punching and cutting roller 15 is arranged in contact with the outer peripheral surface of the receiving wheel 16. The modules of the gear teeth in the first roller 11, the second gear 12, the feeding roller 13 and the punching and cutting roller 15 are the same.

[0025] like Figure 8 As shown in the figure, first, the upper layer material 31 is fed out from the roller of the upper layer material, and at the same time, the lower layer material 32 is fed out from the roller of the lower layer material. The fed upper layer material 31 is bitten into the meshing portion between the first roller 11 having a concavo-convex shape on the outer peripheral surface and the second roller 12 having a concavo-convex shape on the outer peripheral surface that meshes with the concavo-convex shape of the first roller, thereby giving the upper layer material 31 a concavo-convex shape.

[0026] Fig. 9 1 is an enlarged schematic diagram of the main part of the first roller 11. The first roller 11 is a roller formed by combining a plurality of gear teeth 111, 112, etc. having a certain tooth width. The tooth width of each gear determines the protrusion size of the protrusion 35 of the liquid-permeable surface layer 3. The teeth of adjacent gears can be staggered according to the arrangement of the protrusion 35 of the liquid-permeable surface layer 3, and the shape of the gear teeth of the first roller can also be set according to the shape of the protrusion 35 of the liquid-permeable surface layer 3.

[0027] Adsorption holes 113 are formed in the tooth grooves of each gear of the first roller 11. The tooth grooves correspond to the concave portions in the concave-convex shape of the outer peripheral surface of the first roller 11. The adsorption holes 113 are controlled by a suction source (not shown in the figure) such as a fan or a vacuum pump, and suction is performed between the meshing portion of the first roller and the second roller and the confluence portion of the upper layer material 31 and the lower layer material 32. The upper layer material 31, which is given a concave-convex shape by the meshing of the first roller and the second roller, is tightly attached to the outer peripheral surface of the first roller by the suction force of the suction holes 113, and the state in which the concave-convex shape is given is maintained.

[0028] Positioning spraying process. Figure 8 or Fig.10 As shown, Fig.10 It is a partially enlarged schematic diagram of the feeding roller. The feeding hole 132 is provided on the gear 131 of the feeding roller 13, and the feeding hole 132 is connected to the feeding chamber 135 through the feeding hole 136 of the feeding roller 13. The feeding chamber 135 of the feeding roller 13 has a pressure of 1.5-3 times the atmospheric pressure, and the camellia oil sustained-release capsules 36 in the feeding chamber 135 are sprayed onto the upper layer material 31 adsorbed into the first roller tooth groove through the feeding hole 136 and the feeding hole 132 in sequence (that is, the camellia oil sustained-release capsules are sprayed on the inner side of the protrusion 35 of the composite liquid-permeable surface layer 3). The feeding hole 136 of the feeding chamber 135 in the feeding roller 13 is set at the meshing position with the first roller 11, that is to say, only the feeding hole 136 corresponding to the gear 131 of the feeding roller 13 located at the meshing position with the first roller 11 can be connected with the feeding chamber 135 through the feeding hole 136, and the feeding hole 136 of the feeding roller 13 at the meshing position can spray the camellia oil sustained-release capsule 36, so as to realize the positioning and fixed-point spraying of the camellia oil sustained-release capsule 36 on the shaped upper layer material. The feeding hole 136 of the feeding roller 13 in the non-meshing area is not connected with the feeding hole 136, and the camellia oil sustained-release capsule 36 will not be sprayed. At the meshing position of the feeding roller 13 and the first roller 11, the high air pressure in the feeding chamber 135 and the negative pressure of the tooth groove of the first roller 11 can prevent the camellia oil sustained-release capsule 36 from blocking the feeding hole 136 of the feeding roller 13.

[0029] Next, the upper layer material 31 is overlapped with the lower layer material 32 which is conveyed out while the upper layer material 31 is still closely attached to the outer peripheral surface of the first roller 11, and the overlapped upper layer material 31 and lower layer material 32 are clamped between the first roller 11 and the receiving roller 14. At this time, at least one of the first roller 11 and the receiving roller 14 is heated to a predetermined temperature. Thus, the upper layer material 31 and the lower layer material 32 located on the convex portion of the first roller 11, i.e., on the gear teeth of each gear, are bonded together by hot melt bonding. They can also be bonded together by adhesive bonding and ultrasonic bonding. Corresponding convex points (not shown in the figure) can be provided on the gear teeth of the first roller according to the composite liquid-permeable surface layer material bonding points 33, so that the upper layer material 31 and the lower layer material 32 between the first roller 11 and the receiving roller 14 can be bonded together with regularly arranged bonding points.

[0030] Finally, the compounded liquid-permeable surface layer material 3 is subjected to the hole cutting process by the punching cutting roller 15 and the receiving roller 16. The cutter 151 on the punching cutting roller 15 cuts and punches the middle of the joint point of the liquid-permeable surface layer material 3, and adsorbs the cut part to the waste adsorption chamber 153 through the waste adsorption channel 152 of the punching cutting roller. The punching cutting roller 15 is synchronized with the first roller 11, and can scan the joint point of the liquid-permeable surface layer material by positioning the electric eye, and realize the cutting and punching of the middle part of the joint point 33 through the host control. The area of ​​the liquid-permeable surface layer guide hole is 30%-70% of the area of ​​the joint point, preferably 40%-60%. The waste adsorption chamber 153 is connected to an external suction source such as a fan and a vacuum pump to collect the cut part of the adsorption chamber 153 into a waste collection container (not shown in the figure). After the hole cutting process, the continuous liquid-permeable surface layer is transferred to the absorption body compounding process through the guide roller.

[0031] The upper layer material 31 and the lower layer material 32 are made of the same or different fiber nonwoven fabrics. The nonwoven fabric is substantially non-stretchable. When such a sheet is used to form a desired size of concave-convex shape, the liquid-permeable surface layer material 3 that roughly conforms to the concave-convex shape of the first and second concave-convex rollers described later can be manufactured stably and with good repeatability.

[0032] As the above-mentioned liquid-permeable surface layer material, materials used as surface sheets of previously known absorbent products can be used, and there are no special restrictions as long as they are substantially non-stretchable. Various non-woven fabrics such as non-woven fabrics made by carding, spunbond non-woven fabrics, meltblown non-woven fabrics, spunlace non-woven fabrics, and needle-punched non-woven fabrics can be listed. From the perspectives of ensuring strength and improving skin comfort, the fineness of the fibers constituting the liquid-permeable surface layer material is preferably 1-20 dtex, and more preferably 1-4 dtex. The basis weight of the upper non-woven fabric 2 is preferably 10-60 g / m2, and more preferably 15-30 g / m2. On the other hand, the basis weight of the lower non-woven fabric 3 is preferably 5-30 g / m2, and more preferably 10-20 g / m2.

[0033] The absorption core layer 4 is composed of long fibers, short fibers and super absorbent polymers, and the long fibers wrap the short fibers and the super absorbent polymer mixture. The absorption core layer is formed by at least two layers of stacking, and the upper layer 41 of the absorption core layer comprises 40-70wt% long fibers, 30-50wt% short fibers and 1-5wt% super absorbent polymers, and the lower layer 42 of the absorption core layer comprises 30-50wt% long fibers, 40-50wt% short fibers and 5-15wt% super absorbent polymers. As can be selected, in the upper layer of the absorption core layer, super absorbent polymers and camellia oil sustained-release capsules are uniformly sprinkled into the short fibers wrapped by the long fibers after mixing in a ratio of 10:1.

[0034] The step of making the absorbent body 2 is a process of compounding the liquid-permeable surface layer 3, the absorbent core layer 4 and the liquid-impermeable bottom layer 5. Optionally, there are leakage-proof edges on both sides of the liquid-permeable surface layer. Optionally, elastic bands extending in the longitudinal direction are arranged on the outer side of the absorbent core layer of the absorbent body.

[0035] The outer body 6 has a front area 6A, a crotch area 6B and a rear area 6C, and a side sealing portion 7 is formed by joining the front outer body and the rear outer body at the two side edges along the longitudinal direction of the outer body. The outer body 6 is composed of an inner layer 67 and an outer layer 68. At least two transverse elastic rubber bands are arranged in the middle: the first rubber band is arranged 65 in the front area 6A and the rear area 6C, and the second rubber band 66 is mainly arranged in the crotch area 6B. The main processes of the outer body are: ① The outer non-woven fabric 68 is conveyed in the transverse direction, and the outer non-woven fabric has a front area, a crotch area and a rear area connected in sequence along the CD direction; ② The first elastic band 65 applying device applies multiple first elastic bands applied with glue to the front area 6A and the rear area 6C of the outer non-woven fabric respectively, and the first elastic band 65 is arranged transversely in a linear, wavy or rack shape; The second elastic band 66 applying device applies multiple second elastic bands applied with glue to the crotch area 6B of the outer non-woven fabric respectively, and the second elastic band 66 is arranged in a wavy or rack shape along the crotch opening; ③ The inner non-woven fabric 67 is conveyed in the transverse direction, compounded on the first elastic band, the second elastic band and the outer non-woven fabric, and the excess part of the leg circumference is cut off.

[0036] The absorbent body 2 is compounded onto the outer member 6 to form a continuous panty-type diaper body. The elastic bands in the front and rear regions of the outer member that overlap with the absorbent core layer in the absorbent body 2 are preferably removed or weakened by heating and melting or cutting the elastic member. The elastic member on the lateral outer side of the overlap region between the front and rear regions and the absorbent core layer is fixedly joined at one end close to the overlap region between the two layers of nonwoven fabric.

[0037] The continuous panty-type diaper body is folded along the middle of the length direction of the panty-type diaper body to form the front and rear pieces of the panty-type diaper body. When the panty-type diaper body is folded, the support device is used to support the panty-type diaper body in the folding process, so that the front and rear pieces are spaced apart during the folding process, and the front and rear pieces are formed into an arc-shaped bending state; the panty-type diaper body is folded along the crease groove, and the folded panty-type diaper body is rolled once, and then rolled twice. A folding and forming device for achieving stable creases is provided between the first rolling and the second rolling, and the outer sides of the front and rear pieces are rolled to form creases between the front and rear pieces. Finally, the panty-type diaper body is welded and cut to form the panty-type diaper. Example 2

[0038] According to a panty-type diaper provided in this embodiment, the liquid-permeable surface layer material is composed of three layers of non-woven fabrics joined together through a joint point, the middle layer of non-woven fabric has a high degree of bulkiness, and the upper and lower layers have a low degree of bulkiness. The steps of making the liquid-permeable surface layer are as follows: ① a shaping process of giving a concave-convex shape to the upper layer material by the meshing bite between the first roller and the second roller; ② after shaping, the upper layer material is tightly attached to the outer peripheral surface of the first roller by the attraction of the suction hole of the tooth groove of the first roller, and the state of giving it a concave-convex shape is maintained; ③ a positioning spraying process of the camellia oil sustained-release capsule to the upper layer material in the tooth groove of the first roller when the feeding roller is in the meshing position with the first roller; ④ the upper layer material is overlapped with the middle layer material and the lower layer material that are conveyed out in sequence while continuing to be tightly attached to the outer peripheral surface of the first roller, and the overlapped upper, middle and lower layer materials are partially joined together between the first roller and the receiving roller to form a joint point; ⑤ a cutting knife of the punching cutting roller performs a hole cutting process on the middle part of the joint point of the composite liquid-permeable surface layer.

[0039] In one embodiment, the front area 6A and the crotch rear area of ​​the outer body of the underwear-type diaper can be selected to be roughly divided into a waist area 61, a waist area 62, an abdomen area 63 and a abdomen area 64 from the waist opening to the leg opening. The thickness, spacing and number of the elastic elastic bands in the waist area 61 in the front area and the rear area are roughly the same, and the thickness, spacing and number of the elastic elastic bands in the abdomen area 64 in the front area and the rear area are roughly the same. The thickness, spacing and elastic expansion ratio of the elastic elastic bands in at least the waist area 62 and the abdomen area 62 in the front area and the rear area are different. The thickness, elastic expansion ratio and spacing of the elastic elastic bands in the waist area 62 in the front area are roughly the same as those in the abdomen area 63 in the rear area, and the thickness, elastic expansion ratio and spacing of the elastic elastic bands in the abdomen area 63 in the front area are roughly the same as those in the waist area 62 in the rear area.

[0040] The thickness of the elastic rubber band in the waist region 61 in the front and rear regions is 620-1100 deniers, and 6-12 elastic rubber bands are set in the front and rear regions in a state of elongation of 250%-350% and at intervals of 4-8mm. The elastic rubber band in the waist region 61 of the front region is set in a state of greater elongation than the elastic rubber band in the waist region 61 of the rear region. It is preferred that the elastic rubber band stretch ratio of the waist region 61 of the front region is not less than the elastic rubber band stretch ratio of the waist region 61 of the rear waist region. The elastic rubber band in the lower waist region 62 of the front region 6A has a smaller denier than the elastic rubber band in the lower waist region of the rear region 6C. The thickness of the elastic rubber band in the lower waist region 62 in the front region is 480-940 deniers, and 2-5 elastic rubber bands are set in a state of elongation of 250%-350% and at intervals of 10-20mm. The thickness of the elastic band of the waist region 62 in the rear region 6C is 620-1100 deniers, and 6-12 elastic bands are set in a state of elongation 250%-350% and interval 6-20mm. The elastic band of the abdomen region 63 of the front region 6A is larger than the elastic band of the abdomen region 63 of the rear region 6C. The elastic band of the abdomen region 63 in the front region is set in a state of elongation 150-240% and interval 4-13mm, and the thickness of the elastic band 43A is 620-1100 deniers. The elastic band of the abdomen region 63 in the rear region is set in a state of elongation 250%-350% with an interval of 10-30mm, and 2-5 elastic bands are set, and the thickness of the elastic band is 480-940 deniers. The thickness of the elastic bands in the lower abdomen area 64 in the front and rear regions is 620-1100 deniers, the interval is 4-20 mm, and 2-6 bands are set in a state of 250%-350% elongation. The elastic bands in the lower abdomen area 64 of the front waistline are set in a state of smaller elongation than the elastic bands in the lower abdomen area of ​​the rear waistline.

[0041] With the outer body of the underpants-type diaper provided by the present embodiment, when the wearer uses the underpants-type diaper, since the thickness, spacing, and elastic expansion ratio of the elastic bands at least in the lower back and abdomen regions are set differently, the side joint portions form an arc-shaped state under the different stretching effects of the elastic bands in different regions, so that the underpants-type diaper can fit the lower back and abdomen regions of the wearer well.

[0042] The present invention is described in detail above with reference to the embodiments, but this does not constitute a limitation on the content of the present invention. Modifications and changes made under the same conception all belong to the protection scope of the present invention.

Claims

1. A panty-type diaper, comprising an absorbent body and an outer body, wherein the absorbent body has a liquid-permeable surface layer material, a liquid-impermeable bottom layer, and an absorbent core layer located between the liquid-permeable surface layer and the liquid-impermeable bottom layer, and the absorbent body has a front waist panel, a crotch panel, and a rear waist panel in the longitudinal direction, and the absorbent body also has longitudinal side edges and transverse end edges, the liquid-impermeable bottom layer of the absorbent body is joined to the outer member, the outer body has a front region, a crotch region, and a rear region, and the outer body has side sealing portions formed by joining the front outer body and the rear outer body at both side edges in the longitudinal direction, thereby forming an annular outer body, and a panty-type diaper having a waist opening and two leg openings, characterized in that: The liquid-permeable surface layer material of the absorption body is a composite surface layer material, which is composed of at least two layers of non-woven fabrics joined together through a joining point. The upper layer of non-woven fabric has a protrusion protruding upward from the joining point. The protrusion and the joining point are arranged alternately and regularly, and camellia oil sustained-release capsules are sprayed on the inner side of the protrusion. A guide hole smaller than the joining point is arranged at the joining point.

2. The underpants-type diaper according to claim 1, characterized in that: The liquid-permeable surface layer material is composed of three layers of non-woven fabrics joined together through joining points, the middle layer of non-woven fabric has high bulkiness, and the upper and lower layers have low bulkiness.

3. The underpants-type diaper according to claim 1, characterized in that: The area of ​​the flow-guiding holes of the liquid-permeable surface layer material is 0.3-0.7 times the area of ​​the joining points, and the flow-guiding holes in the upper fluffy non-woven fabric are larger, and the flow-guiding holes in the lower non-woven fabric are smaller.

4. The underpants-type diaper according to claim 1, characterized in that: The tea tree essential oil sustained-release capsule uses high molecular weight polysaccharide chitosan and sodium alginate as the sustained-release microcapsule outer wall, uses methyl cellulose as the sustained-release microcapsule inner wall, and the camellia oil is embedded in the sustained-release microcapsule.

5. The underpants-type diaper according to claim 1, characterized in that The preparation method of the camellia oil sustained-release capsule is as follows: ① weigh 1-2 parts by weight of methyl cellulose and dissolve it in 100 parts by weight of deionized water, then add 1 part by weight of camellia oil to obtain a methyl cellulose-camellia oil solution; ② weigh 1-2 parts by weight of chitosan and dissolve it in 100 parts by weight of deionized water, mix well and add it to the aqueous solution in step ①; ③ weigh 12-20 parts by weight of sodium alginate and dissolve it in 100 parts by weight of deionized water, mix well and add it to the aqueous solution obtained in step ②; ④ spray-dry to obtain the camellia oil sustained-release capsule.

6. The underpants-type diaper according to claim 1, characterized in that: The absorbent core layer is composed of long fibers, short fibers and super absorbent polymers, and the long fibers wrap the short fibers and the super absorbent polymer mixture. The absorbent core layer is formed by stacking at least two layers, the upper layer contains 40-70wt% of long fibers, 30-50wt% and 1-5wt% of super absorbent polymers, and the lower layer contains 30-50wt% of long fibers, 40-50wt% and 5-15wt% of super absorbent polymers.

7. A method for preparing the underpants-type diaper according to claim 1, characterized in that: The following steps are involved: (1) Steps for making a liquid-permeable surface layer, ① a shaping process in which the meshing and biting between the first roller and the second roller give the upper layer material a concave-convex shape; ② after shaping, the upper layer material is tightly attached to the outer peripheral surface of the first roller by the suction of the suction holes of the tooth grooves of the first roller, and the concave-convex shape is maintained; ③ a positioning spraying process in which the camellia oil sustained-release capsule is positioned and sprayed onto the upper layer material in the tooth grooves of the first roller when the feeding roller is in meshing position with the first roller; ④ the upper layer material continues to be tightly attached to the outer peripheral surface of the first roller. The upper and lower materials are overlapped with each other and are partially joined together between the first roller and the receiving roller to form a joint point; ⑤ The cutter of the perforated cutting roller performs a hole cutting process on the middle of the joint point of the composite liquid-permeable surface layer; (2) the step of making the absorbent body, compounding the liquid-permeable surface layer, the absorbent core layer and the liquid-impermeable bottom layer together; (3) the step of making the outer component, ① the outer non-woven fabric is conveyed in the transverse direction, and the outer non-woven fabric has a front area, a crotch area and a back area connected in sequence along the CD direction; ② The first elastic band applying device applies a plurality of first elastic bands with glue applied to the front and rear areas of the outer non-woven fabric respectively, and the first elastic bands are arranged horizontally in a linear, wavy or rack shape; the second elastic band applying device applies a plurality of second elastic bands with glue applied to the crotch area of ​​the outer non-woven fabric respectively, and the second elastic bands are arranged along the crotch opening in a wavy or rack shape; ③ The inner non-woven fabric is transported in the horizontal direction, composited with the first elastic band, the second elastic band and the outer non-woven fabric, and the excess part of the leg circumference is cut off; (4) The absorbent body is composited to the outer component to form a continuous underwear-type diaper body; (5) A folding process is performed along the middle of the length direction of the underwear-type diaper body; (6) The underwear-type diaper body is welded and cut to form an underwear-type diaper.

8. A method for preparing the underpants-type diaper according to claim 7, characterized in that: In step (1), the modules of the gear teeth of the first roller, the second gear, the feeding roller, and the punching and cutting roller are the same.

9. A method for preparing the underpants-type diaper according to claim 7, characterized in that: In step (1), before step ⑤, a positioning camera is used to scan the joint point of the liquid-permeable surface layer. By controlling the driving of the punching roller by the host, positioning punching can be achieved at the joint point of the liquid-permeable surface layer.

10. A method for preparing a panty-type diaper according to claim 7, characterized in that: In the folding process of step (5), when the front and rear pieces of the underwear-type diaper body are folded, the supporting device is used to support the underwear-type diaper body in the folding process, so that the front and rear pieces are spaced apart during the folding process, and the front and rear pieces are formed into an arc-shaped bending state; the underwear-type diaper body is folded along the crease groove, and the folded underwear-type diaper body is rolled once and then rolled twice. A folding forming device for achieving a stable crease is provided between the first rolling and the second rolling, so that the outer side surfaces of the front and rear pieces are rolled, so that a crease is formed between the front and rear pieces.

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