Double-layer surface layer centered composite urine and excrement combined suction paper diaper and production process thereof

Abstract

The invention discloses a double-layer surface layer centrally-compounded urine and excrement combined absorption paper diaper and a production process thereof, and relates to the technical field of absorption products, the double-layer surface layer centrally-compounded urine and excrement combined absorption paper diaper comprises a paper diaper main body and a waistline area, the paper diaper main body comprises a surface layer, an absorption core body and a bottom layer, the absorption core body is clamped between the surface layer and the bottom layer, and the waistline area is arranged between the surface layer and the bottom layer; the waistline area comprises a front waistline area and a rear waistline area, the skin-friendly hot-air non-woven fabric surface layer of the surface layer can quickly lock urine and guide flow through the rhombic groove area, the air permeability is enhanced in combination with the salient point punching area, and the contact surface is kept dry and comfortable; the absorption core body adopts an ultrasonic edge compounding and middle hot melt adhesive combined process, so that the adhesive amount is reduced, a water absorption expansion space is reserved, and liquid permeation is accelerated; the bottom layer is compounded with the waterproof breathable film through micropore treatment, a double-micropore structure is formed, and the bottom breathability is greatly improved on the basis of blocking liquid leakage. The overall design realizes triple improvement of flow guide efficiency, air permeability and skin comfort through structural optimization.

Description

Technical Field

[0001] The invention relates to the technical field of absorbent products, and in particular to a urine and feces absorbing diaper with a double-layer centrally compounded surface layer and a production process thereof. Background Art

[0002] With the rapid development of the infant care product market, diapers, as a core product, are attracting more and more attention from consumers for their performance and quality. Diapers, as an important part of modern infant care products, are directly related to the health and comfort of infants. With the development of science and technology and the improvement of people's living standards, consumers' expectations for diapers are no longer satisfied with basic absorption and protection functions, but are more concerned about their breathability, microenvironment and comfort. However, existing diaper products often have problems such as poor breathability, low absorption efficiency and high humidity in the microenvironment during use, which causes users' skin to become moist and uncomfortable, and even causes skin inflammation and infection. In addition, the humid environment inside the diaper is also prone to breeding bacteria and producing odor, affecting the user experience.

[0003] After analysis, it is found that there are many reasons for the poor breathability of diapers, such as the fit between the waist circumference and the human body, the moisture-wicking performance of the diaper bottom layer, and the thickness and amount of glue applied. Therefore, it is necessary to develop a diaper with good breathability and absorption performance to meet the needs of users and further promote industrial upgrading. Summary of the invention

[0004] In view of the technical defects existing in the background technology, the present invention proposes a method to solve the above technical problems and meet the actual needs. The specific technical solution is as follows: A double-layer diaper with a centrally-combined surface layer and urine and feces absorption, comprising a diaper body and a waist area, wherein the diaper body comprises a surface layer, an absorbent core and a bottom layer, wherein the absorbent core is sandwiched between the surface layer and the bottom layer, and the waist area comprises a front waist area and a rear waist area; The two sides of the diaper body are also provided with leak-proof edges, the two ends of which extend into the front waist area and the back waist area respectively, and the leak-proof edges are formed by folding a single non-woven fabric; The surface layer comprises a hot air nonwoven fabric layer and a hydrophilic spunbond nonwoven fabric layer arranged in sequence from top to bottom, and the surface of the surface layer is provided with a diamond-shaped perforated area and a convex point perforated area, the diamond-shaped perforated area is composed of a strip-shaped protrusion belt and a plurality of first penetration holes, the strip-shaped protrusion belt is arranged in a staggered manner, the convex point perforated area is composed of spherical protrusions and a plurality of second penetration holes, and the spherical protrusions are arranged in an array on the surface of the surface layer; The strip-shaped protrusions are staggered to form a plurality of diamond-shaped grooves, and the bottom of the diamond-shaped grooves is provided with five first penetration holes, and a longitudinal air flow channel and a transverse air flow channel are formed between two adjacent spherical protrusions. Corresponding to the positions where the longitudinal air flow channel and the transverse air flow channel cross and overlap, nine second penetration holes are provided, and the second penetration holes are arranged in an array.

[0005] An adhesive layer is provided between the hydrophilic spunbond nonwoven fabric layer and the hot air nonwoven fabric layer, and the middle portion of the hot air nonwoven fabric layer is bonded and fixed to the middle portion of the hydrophilic spunbond nonwoven fabric layer through the adhesive layer.

[0006] As an improvement of the above scheme, the length dimension of the surface layer is smaller than the length dimension of the bottom layer, the two ends of the bottom layer in the length direction are folded toward the inner side of the surface layer, and the two ends of the bottom layer in the length direction are folded and pressed onto the upper layer of the end of the surface layer, and the length dimension of the leak-proof partition edge is not less than the spacing dimension between the two ends of the bottom layer after flipping.

[0007] As an improvement of the above solution, the inner surface of the bottom layer is provided with first bonding points arranged in an array at positions corresponding to the front waist region, a first elastic spandex yarn is sandwiched in the front waist region, and two sides of the first elastic spandex yarn are sandwiched in the front waist region through the first bonding points; The inner surface of the bottom layer is provided with second bonding points arranged in an array at positions corresponding to the rear waistline area, a second elastic spandex yarn is sandwiched in the rear waistline, and both sides of the second elastic spandex yarn are sandwiched in the rear waistline area through the second bonding points.

[0008] As an improvement on the above scheme, the leak-proof partition includes a first leak-proof partition and a second leak-proof partition, the inner lower edge of the first leak-proof partition extends to the absorption core and the bottom layer and is bonded and fixed, the inner lower edge of the second leak-proof partition extends to the absorption core and the bottom layer and is bonded and fixed, and the outer lower edges of the first leak-proof partition and the second leak-proof partition extend toward the outside of the diaper body to form a skirt.

[0009] As an improvement of the above solution, the diamond-shaped perforated area is arranged in the middle of the length direction of the surface layer, and the convex point perforated area includes a first convex point perforated area and a second convex point perforated area, and the first convex point perforated area and the second convex point perforated area are respectively arranged at two ends of the length direction of the surface layer and are in contact with the outer edge of the diamond-shaped perforated area; The length dimension of the first convex point punching area is greater than the length dimension of the second convex point punching area. The first convex point punching area is arranged at the end where the surface layer connects with the front waistline area, and the second convex point punching area is arranged at the end where the surface layer connects with the back waistline area.

[0010] As an improvement of the above-mentioned scheme, the absorbent core includes an upper layer of non-woven fabric, a fluffy fabric and a lower layer of non-woven fabric arranged from top to bottom, the end surface of the fluffy fabric on one side where the upper layer of non-woven fabric is bonded is provided with first polymer water-absorbing particles, the end surface of the fluffy fabric on one side where the lower layer of non-woven fabric is bonded is provided with second polymer water-absorbing particles, and a third permeation hole is opened in the thickness direction of the upper layer of non-woven fabric, and the cross-sectional shape of the third permeation hole is V-shaped.

[0011] A production process for urine and feces absorbing diapers, comprising the following steps: Step 1, bottom layer manufacturing process, unwinding the rolled bottom layer non-woven fabric so that the layer with the waterproof and breathable film faces upward, and cutting the bottom layer out of the bottom layer non-woven fabric by a knife roller; Step 2, glue spraying process, coating the bottom layer at the position corresponding to the front waist area by dispensing glue to form a first bonding point, coating the bottom layer at the position corresponding to the back waist area by hanging glue to form a second bonding point, and coating glue at the edge positions on both sides of the composite area of ​​the bottom layer and the absorbent core to form a composite bonding area; Step 3, a sidewall laminating process, laminating the bottom and outer part of the first leakproof sidewall and the second leakproof sidewall with the composite bonding area, wherein the inner side of the first leakproof sidewall and the inner side of the second leakproof sidewall extend into the interlayer between the absorbent core and the bottom layer; Step 4, core lamination process, placing the absorbent core between the first and second partition edges corresponding to the bottom layer, and laminating the absorbent core with the inner composite bonding area by lamination; Step 5, preparing a composite surface layer, stacking a hot air nonwoven fabric layer and a hydrophilic spunbond nonwoven fabric layer from top to bottom in sequence, spraying a bonding layer on the surface of the hydrophilic spunbond nonwoven fabric layer by atomization, and pressing the hot air nonwoven fabric layer and the hydrophilic spunbond nonwoven fabric layer by a pressing roller, and simultaneously forming the diamond-shaped perforated area and the convex point perforated area during the composite process; Step 6, surface layer composite process, placing the prepared composite surface layer on the upper layer of the absorbent core, and composite the surface layer and the bottom layer by ultrasonic spot welding on both sides of the surface layer; Step 7, bottom layer folding process, laying out the first elastic spandex yarn at the bottom layer corresponding to the front waistline area, laying out the second elastic spandex yarn at the bottom layer corresponding to the back waistline area, and folding the end of the bottom layer to cover the end of the surface layer and the leak-proof partition edge.

[0012] As an improvement of the above scheme, in step 1, the surface of the bottom layer is compounded with a breathable waterproof membrane, the breathable waterproof membrane is a 16gsm PTFE bottom membrane, and the bottom layer is subjected to microporous treatment before being compounded with the breathable waterproof membrane, specifically including: Step 1.1, preheating roller treatment: softening and initially bonding the nonwoven fabric fibers by heating; Step 1.2, punching roller treatment: use a needle roller to press micropores on the preheated non-woven fabric, with a pore size of 0.1-1mm; Step 1.3, rubber roller coating: after punching, hot melt adhesive is coated by a rubber roller, and the breathable waterproof film is conveyed for compounding simultaneously; Step 1.4, cooling roller shaping: the bottom layer after being compounded with the breathable waterproof membrane is quickly cooled to solidify the adhesive layer.

[0013] As an improvement of the above scheme, in step 2, the number of the composite bonding areas is two, both of which are formed by scraper coating, the inner side of the composite bonding area is bonded to the absorbent core and the bottom layer, and the outer side of the composite bonding area is bonded to the leak-proof partition and the bottom layer.

[0014] As an improvement of the above solution, in step 7, the first elastic spandex is arranged transversely along the width direction of the front waist region after being stretched, and a convex cavity 1 is formed between two first bonding points adjacent in the longitudinal direction and in the transverse direction through elastic contraction; The second elastic spandex yarn is arranged transversely along the width direction of the rear waist region after being stretched, and forms a second protruding cavity between two second bonding points adjacent in the longitudinal direction and in the transverse direction through elastic contraction.

[0015] The beneficial effects of the present invention are: 1. The side of the surface layer in contact with the human body is a hot air non-woven fabric layer, which has good skin-friendly touch. A diamond-shaped perforated area and a convex point perforated area are formed on the side of the surface layer facing the human body by lamination. The convex point perforated area increases the air permeability of the diaper, and combined with the skin-friendly touch, enhances the comfort of the user when wearing it. The diamond-shaped perforated area intercepts urine and feces through a number of diamond-shaped grooves. When contacting urine and loose feces, the urine and loose feces can be quickly locked and quickly directed downward to the absorption layer, so that the surface layer is dry and the baby's skin is less irritated; 2. The absorbent core, bottom layer and leakproof edge are fixed by the composite bonding area, which reduces the amount of glue applied to fix the absorbent core and reduces the hot melt adhesive required for compounding without affecting the connection strength of the diaper. A space is formed between the absorbent core and the bottom layer to reserve the core for water absorption and expansion. Hot melt adhesive is used in the middle between the surface layer and the absorbent core, and ultrasonic technology is used to compound the edges to reduce the resistance of liquid passing through the layers, thereby achieving the purpose of rapid absorption; 3. The bottom layer is compounded with the waterproof breathable membrane after microporous treatment. The waterproof breathable membrane has a unique microporous structure with a pore size between water molecule clusters and water vapor molecules, allowing water vapor to pass through while blocking liquid water penetration. The bottom layer is microporous treated to form dense micropores, and the double microporous structure increases the air permeability of the bottom of the diaper. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the end surface structure of the diaper main body of the present invention.

[0017] Figure 2 It is a schematic diagram of the bottom ends of the diaper body of the present invention.

[0018] Figure 3 It is a schematic diagram of the structure of the diaper body in the thickness direction of the present invention.

[0019] Figure 4 It is a schematic diagram of the thickness direction structure of the diamond-shaped perforated area of ​​the diaper body of the present invention.

[0020] Figure 5 It is a schematic diagram of the thickness direction structure of the convex point punching area of ​​the diaper body of the present invention.

[0021] Figure 6 It is a schematic diagram of the thickness direction structure of the absorbent core of the diaper main body of the present invention.

[0022] Wherein: surface layer 1, hot air non-woven fabric layer 101, hydrophilic spunbond non-woven fabric layer 102, bonding layer 103, absorbent core 2, upper non-woven fabric 201, fluffy fabric 202, lower non-woven fabric 203, first polymer water-absorbing particles 204, second polymer water-absorbing particles 205, third permeation holes 206, bottom layer 3, front waist region 301, back waist region 302, first bonding point 303, second bonding point 304, first elastic spandex yarn 305, second Elastic spandex yarn 306, leak-proof partition 4, first leak-proof partition 401, second leak-proof partition 402, skirt 403, diamond-shaped punching area 5, strip raised belt 501, first penetration hole 502, diamond-shaped groove 503, convex point punching area 6, spherical protrusion 601, second penetration hole 602, longitudinal air flow channel 603, transverse air flow channel 604, first convex point punching area 605, second convex point punching area 606, breathable and waterproof membrane 7, composite bonding area 8. DETAILED DESCRIPTION

[0023] The implementation modes of the present invention are described below in conjunction with the accompanying drawings and relevant embodiments. The implementation modes of the present invention are not limited to the following embodiments, and the present invention relates to relevant necessary components in the technical field, which should be regarded as the known technology in the technical field and can be known and mastered by the technical personnel in the technical field.

[0024] A double-layer composite urine and feces absorbing diaper, comprising a diaper body and a waist area, wherein the diaper body comprises a surface layer 1, an absorbent core 2 and a bottom layer 3, wherein the absorbent core 2 is sandwiched between the surface layer 1 and the bottom layer 3, and the waist area comprises a front waist area 301 and a rear waist area 302; The two sides of the diaper body are also provided with leak-proof edges 4, the two ends of which extend into the front waist area 301 and the back waist area respectively, and the leak-proof edges 4 are formed by folding a single non-woven fabric; In the technical solution of the diaper main body of the present invention, the bottom layer 3, the absorbent core 2 and the surface layer 1 are stacked in sequence from bottom to top, and after the leak-proof partition edges 4 are bonded on both sides of the absorbent core 2, the ends of the bottom layer 3 in the length direction are folded and fixed, thereby forming the diaper main body; In the technical scheme of the surface layer 1 of the present invention, the surface layer 1 includes a hot air non-woven fabric layer 101 and a hydrophilic spunbond non-woven fabric layer 102 arranged in sequence from top to bottom, and an adhesive layer 103 is provided between the hydrophilic spunbond non-woven fabric layer 102 and the hot air non-woven fabric layer 101, and the middle part of the hot air non-woven fabric layer 101 and the middle part of the hydrophilic spunbond non-woven fabric layer 102 are bonded and fixed by the adhesive layer 103, and the adhesive layer 103 is hot melt adhesive bonding, and the bonding method is one of point glue and atomized glue spraying, and the side edges of the hot air non-woven fabric layer 101 and the hydrophilic spunbond non-woven fabric layer 102 are composited by ultrasonic spot welding when being fixed to the bottom layer 3; It should be noted that the hot air non-woven fabric layer 101 is in contact with the human body when in use, and has a soft property, which can provide a soft touch when in contact with the user, and the hydrophilic spunbond non-woven fabric layer 102 has a better hydrophilic property, and its function during use is to promote the rapid penetration of water through the hot air non-woven fabric layer 101; Furthermore, the surface of the surface layer 1 is provided with a diamond-shaped perforated area 5 and a convex perforated area 6. The diamond-shaped perforated area 5 is used to block loose stools. Urine mixed with loose stools are blocked in the diamond-shaped perforated area 5 and cannot overflow everywhere. They quickly penetrate downward to the core layer through the first penetration hole 502, thereby preventing the loose stools from overflowing everywhere due to the baby's movement and making cleaning difficult. The convex perforated area 6 is used to reduce the contact area with the human body and form an air flow channel between the human body surface and the fabric, thereby avoiding the situation of being airtight due to tight fit and improving the comfort during use.

[0025] Further, in the above scheme, the diamond-shaped perforated area 5 is composed of strip-shaped raised belts 501 and a plurality of first penetration holes 502, the strip-shaped raised belts 501 are staggered, the strip-shaped raised belts 501 are obliquely arranged on the surface of the surface layer 1, the strip-shaped raised belts 501 are staggered to form a plurality of diamond-shaped grooves 503, the bottom of the diamond-shaped grooves 503 is provided with five first penetration holes 502, the diamond-shaped grooves 503 have a retention effect when in use, when the user's urine mixed with loose stools enters the diamond-shaped perforated area 5, the diamond-shaped grooves 503 have a blocking effect on the flow, and after blocking and interception, they are quickly absorbed through the first penetration holes 502; Further, in the above scheme, the convex point perforated area 6 is composed of a spherical protrusion 601 and a plurality of second penetration holes 602, the spherical protrusions 601 are arranged in an array on the surface of the surface layer 1, and a longitudinal air flow channel 603 and a transverse air flow channel 604 are formed between two adjacent spherical protrusions 601, and nine second penetration holes 602 are arranged at the positions where the longitudinal air flow channel 603 and the transverse air flow channel 604 cross and overlap, and the second penetration holes 602 are arranged in an array, and the spherical protrusions 601 fit the human body when in use, effectively reducing the area where the convex point perforated area 6 contacts the human body surface skin, and reducing the user's discomfort; Furthermore, in the above scheme, the length dimension of the surface layer 1 is smaller than the length dimension of the bottom layer 3, and the two ends of the bottom layer 3 in the length direction are folded toward the inner side of the surface layer 1. After the two ends of the bottom layer 3 in the length direction are folded, they are pressed onto the upper layer of the end of the surface layer 1, and the length dimension of the leak-proof partition 4 is not smaller than the spacing dimension between the two ends of the bottom layer 3 after flipping. It should be noted that the waist circumference is formed at one time by folding the bottom layer 3, and the waist circumference and the bottom layer 3 of the diaper are formed in one piece, which simplifies the molding process of the waist circumference. Compared with the traditional structure in which the waist circumference and the absorption area are separately connected, the one-piece structure has better strength, is easier to resist stretching, and the overall thickness of the diaper will also be reduced.

[0026] Further, in the above scheme, the inner surface of the bottom layer 3 is provided with first bonding points 303 arranged in an array at positions corresponding to the front waist region 301, and the front waist region 301 is sandwiched with first elastic spandex yarns 305. Both sides of the first elastic spandex yarns 305 are sandwiched in the front waist region 301 through the first bonding points 303. The first elastic spandex yarns 305 are bonded to the first bonding points 303 of the front waist region 301 after stretching. The first bonding points 303 arranged in an array can bond the longitudinal first elastic spandex yarns 305 and the transverse first elastic spandex yarns 305. The spacing density of the longitudinally arranged first elastic spandex yarns 305 is greater than the spacing density of the transversely arranged first elastic spandex yarns 305. Furthermore, the inner surface of the bottom layer 3 is provided with second bonding points 304 arranged in an array at positions corresponding to the rear waistline area 302, and a second elastic spandex yarn 306 is sandwiched in the rear waistline. Both sides of the second elastic spandex yarn 306 are sandwiched in the rear waistline area 302 through the second bonding points 304. The second bonding points 304 arranged in an array can bond the longitudinal second elastic spandex yarn 306 and the transverse second elastic spandex yarn 306, and the spacing density of the longitudinally arranged second elastic spandex yarn 306 is greater than the spacing density of the transversely arranged second elastic spandex yarn 306. It should be noted that after being stretched and bonded, the first elastic spandex yarn 305 and the second elastic spandex yarn 306 will form a plurality of raised cavities on the surface of the waistline due to the contraction of their own elastic force, and air can flow between two adjacent raised cavities. The air flow channel can be connected to the air flow channel in the convex point perforated area 6 to increase air circulation in the user's buttocks and abdomen. Furthermore, the front waistline and the rear waistline are covered with the ends of the surface layer 1 by folding, and the overflow of urine and feces will also be blocked by the folded ends of the bottom layer 3.

[0027] Furthermore, in the above scheme, the leak-proof partition 4 includes a first leak-proof partition 401 and a second leak-proof partition 402, the inner lower edge of the first leak-proof partition 401 extends to the absorption core 2 and the bottom layer 3 and is bonded and fixed, the inner lower edge of the second leak-proof partition 402 extends to the absorption core 2 and the bottom layer 3 and is bonded and fixed, the outer lower edges of the first leak-proof partition 401 and the second leak-proof partition 402 extend toward the outside of the diaper body to form a skirt 403, the first leak-proof partition 401, the second leak-proof partition 402, and the folded end of the bottom layer 3 form a pocket-like structure, and urine and watery feces cannot turn over the first leak-proof partition 401 and the second leak-proof partition 402.

[0028] Further, in the above scheme, the diamond-shaped perforated area 5 is arranged in the middle of the length direction of the surface layer 1, and the convex point perforated area 6 includes a first convex point perforated area 605 and a second convex point perforated area 606, and the first convex point perforated area 605 and the second convex point perforated area 606 are respectively arranged at both ends of the length direction of the surface layer 1, and are in contact with the outer edge of the diamond-shaped perforated area 5; It should be noted that the length dimension of the first convex point perforated area 605 is greater than the length dimension of the second convex point perforated area 606, the first convex point perforated area 605 is arranged at the end where the surface layer 1 is connected to the front waist area 301, and the second convex point perforated area 606 is arranged at the end where the surface layer 1 is connected to the back waist area 302, so that the function of the diamond perforated area 5 is more targeted at loose stools, so the diamond perforated area 5 is closer to the user's buttocks, and the function of the convex point perforated area 6 is more targeted at urine, so the convex point perforated area 6 is closer to the urine discharge position.

[0029] Furthermore, in the above scheme, the absorbent core 2 includes an upper non-woven fabric 201, a fluffy fabric 202 and a lower non-woven fabric 203 arranged from top to bottom, and the end surface of one side of the fluffy fabric 202 that is bonded to the upper non-woven fabric 201 is provided with first polymer water-absorbing particles 204, and the end surface of one side of the fluffy fabric 202 that is bonded to the lower non-woven fabric 203 is provided with second polymer water-absorbing particles 205, and the upper non-woven fabric 201 is provided with a third permeation hole 206 in the thickness direction, and the cross-sectional shape of the third permeation hole 206 is V-shaped.

[0030] A production process for urine and feces absorbing diapers, comprising the following steps: Step 1, a manufacturing process of the bottom layer 3, unwinding the rolled bottom layer 3 non-woven fabric so that the layer with the waterproof and breathable film faces upward, and cutting out the bottom layer 3 on the bottom layer 3 non-woven fabric by a knife roller; Step 2, glue spraying process, coating the bottom layer 3 at the position corresponding to the front waist area 301 by dispensing glue to form a first bonding point 303, coating the bottom layer 3 at the position corresponding to the back waist area 302 by hanging glue to form a second bonding point 304, and coating glue at the edge positions on both sides of the composite area of ​​the bottom layer 3 and the absorbent core 2 to form a composite bonding area 8; Step 3, edge laminating process, laminating the bottom of the first leakproof edge 401 and the second leakproof edge 402 with the outer part of the composite bonding area 8, and the inner side of the first leakproof edge 401 and the inner side of the second leakproof edge 402 extend into the interlayer between the absorbent core 2 and the bottom layer 3; Step 4, core composite process, placing the absorbent core 2 between the first and second edges of the bottom layer 3, and composite the absorbent core 2 with the inner composite bonding area 8 by lamination; Step 5, preparing a composite surface layer 1, stacking a hot air nonwoven fabric layer 101 and a hydrophilic spunbond nonwoven fabric layer 102 in sequence from top to bottom, spraying an adhesive layer 103 on the surface of the hydrophilic spunbond nonwoven fabric layer 102 by atomization, and pressing the hot air nonwoven fabric layer 101 and the hydrophilic spunbond nonwoven fabric layer 102 by a pressing roller, and synchronously forming the diamond-shaped perforated area 5 and the convex point perforated area 6 during the compounding; Step 6, surface layer 1 composite process, placing the prepared composite surface layer 1 on the upper layer of the absorbent core 2, and composite the surface layer 1 and the bottom layer 3 on both sides of the surface layer 1 by ultrasonic spot welding; Step 7, folding process of the bottom layer 3, laying out the first elastic spandex yarn 305 at the position of the bottom layer 3 corresponding to the front waistline area 301, laying out the second elastic spandex yarn 306 at the position of the bottom layer 3 corresponding to the back waistline area 302, and folding the end of the bottom layer 3 to cover the end of the surface layer 1 and the leak-proof partition 4.

[0031] Further, in the above scheme, in step 1, the surface of the bottom layer 3 is compounded with a breathable waterproof membrane 7, and the breathable waterproof membrane 7 is a 16gsm PTFE bottom membrane. Before the bottom layer 3 is compounded with the breathable waterproof membrane 7, the bottom layer 3 is subjected to microporous treatment, specifically including: Step 1.1, preheating roller treatment: heating is used to soften the nonwoven fabric fibers and initially bond them.

[0032] Step 1.2, punching roller treatment: use a needle roller to press micropores on the preheated non-woven fabric, with a pore size of 0.1-1mm.

[0033] Step 1.3, rubber roller coating: after punching, hot melt adhesive is coated by a rubber roller, and the breathable and waterproof membrane 7 is simultaneously conveyed for compounding.

[0034] Step 1.4, cooling roller shaping: the bottom layer 3 after being compounded with the breathable waterproof membrane 7 is quickly cooled to solidify the adhesive layer.

[0035] Furthermore, in the above scheme, in step 2, the number of the composite bonding areas 8 is two, both of which are formed by scraper coating, the inner side of the composite bonding area 8 is bonded to the absorbent core 2 and the bottom layer 3, and the outer side of the composite bonding area 8 is bonded to the leak-proof partition edge 4 and the bottom layer 3.

[0036] It should be noted that after the bottom of the first leak-proof partition 401 and the second leak-proof partition 402 are bonded and fixed to the bottom layer 3 through the composite bonding area 8, in the composite process of the surface layer 1, the two sides of the width of the surface layer 1 are further fixed by ultrasonic spot welding, so that the tension of the leak-proof partition 4 directly acts on the bottom layer 3. Compared with the traditional structure of the leak-proof partition 4 fixed to the surface layer 1, it has better tension and is not easy to fall off under the action of force.

[0037] Further, in the above scheme, in step 7, the first elastic spandex is arranged transversely along the width direction of the front waist region 301 after being stretched, and a convex cavity 1 is formed between two first bonding points 303 adjacent in the longitudinal direction and in the transverse direction through elastic contraction; The second elastic spandex yarn 306 is arranged transversely along the width direction of the rear waist region 302 after being stretched, and forms a second protruding cavity between two second bonding points 304 adjacent in the longitudinal direction and in the transverse direction through elastic contraction.

[0038] It should be noted that the raised cavity one and the raised cavity two will both fit the surface of the human body when in use. The raised curvature of the raised cavity one and the raised cavity two can be enhanced by longitudinally arranging elastic spandex yarns, but the contraction force of the waist area will be increased. It is generally suitable for infants and young children, and whether to arrange longitudinal elastic spandex yarns depends on customer needs.

[0039] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A double-layered urine and feces absorbing diaper with centrally-combined surface layers, characterized in that: The diaper comprises a diaper body and a waist region, wherein the diaper body comprises a surface layer (1), an absorbent core (2) and a bottom layer (3), wherein the absorbent core (2) is sandwiched between the surface layer (1) and the bottom layer (3), and the waist region comprises a front waist region (301) and a rear waist region (302); Leak-proof edges (4) are also provided on both sides of the diaper body, and the two ends of the leak-proof edges (4) extend into the front waist area (301) and the rear waist area respectively, and the leak-proof edges (4) are formed by folding a single non-woven fabric; The surface layer (1) comprises a hot air non-woven fabric layer (101) and a hydrophilic spunbond non-woven fabric layer (102) arranged in sequence from top to bottom, and a diamond-shaped perforated area (5) and a convex point perforated area (6) are provided on the surface of the surface layer (1), wherein the diamond-shaped perforated area (5) is composed of a strip-shaped protrusion belt (501) and a plurality of first penetration holes (502), and the strip-shaped protrusion belt (501) is arranged in a staggered manner, and the convex point perforated area (6) is composed of spherical protrusions (601) and a plurality of second penetration holes (602), and the spherical protrusions (601) are arranged in an array on the surface of the surface layer (1); The strip-shaped protrusions (501) are staggered to form a plurality of rhombus-shaped grooves (503); the bottom of the rhombus-shaped grooves (503) is provided with five first penetration holes (502); a longitudinal air flow channel (603) and a transverse air flow channel (604) are formed between two adjacent spherical protrusions (601); nine second penetration holes (602) are provided at positions corresponding to the intersection and overlap of the longitudinal air flow channel (603) and the transverse air flow channel (604); the second penetration holes (602) are arranged in an array; An adhesive layer (103) is provided between the hydrophilic spunbond non-woven fabric layer (102) and the hot air non-woven fabric layer (101), and the middle portion of the hot air non-woven fabric layer (101) is bonded and fixed to the middle portion of the hydrophilic spunbond non-woven fabric layer (102) via the adhesive layer (103).

2. The urine and feces absorbing diaper with double-layer centrally-combined surface layers according to claim 1, characterized in that: The length dimension of the surface layer (1) is smaller than the length dimension of the bottom layer (3); the two ends of the bottom layer (3) in the length direction are folded toward the inner side of the surface layer (1); the two ends of the bottom layer (3) in the length direction are folded and pressed onto the upper layer of the end of the surface layer (1); and the length dimension of the leakproof partition (4) is not smaller than the spacing dimension between the two ends of the bottom layer (3) after being folded.

3. The urine and feces absorbing diaper with double-layer centrally-combined surface layers according to claim 1, characterized in that: The inner surface of the bottom layer (3) is provided with first bonding points (303) arranged in an array at positions corresponding to the front waist region (301), and a first elastic spandex yarn (305) is sandwiched in the front waist region (301), and two sides of the first elastic spandex yarn (305) are sandwiched in the front waist region (301) through the first bonding points (303); The inner surface of the bottom layer (3) is provided with second bonding points (304) arranged in an array at positions corresponding to the rear waistline area (302), and a second elastic spandex yarn (306) is sandwiched in the rear waistline, and the two sides of the second elastic spandex yarn (306) are sandwiched in the rear waistline area (302) through the second bonding points (304).

4. The urine and feces absorbing diaper with double-layer centrally-combined surface layers according to claim 1, characterized in that: The leak-proof partition (4) comprises a first leak-proof partition (401) and a second leak-proof partition (402), wherein the inner lower edge of the first leak-proof partition (401) extends to the space between the absorbent core (2) and the bottom layer (3) to be bonded and fixed, the inner lower edge of the second leak-proof partition (402) extends to the space between the absorbent core (2) and the bottom layer (3) to be bonded and fixed, and the outer lower edges of the first leak-proof partition (401) and the second leak-proof partition (402) extend toward the outside of the diaper body to form a skirt (403).

5. The urine and feces absorbing diaper with double-layer centrally-combined surface layers according to claim 1, characterized in that: The diamond-shaped perforated area (5) is arranged in the middle of the length direction of the surface layer (1), and the convex point perforated area (6) comprises a first convex point perforated area (605) and a second convex point perforated area (606), wherein the first convex point perforated area (605) and the second convex point perforated area (606) are arranged at two ends of the length direction of the surface layer (1) respectively and are in contact with the outer edge of the diamond-shaped perforated area (5); The length dimension of the first convex point punching area (605) is greater than the length dimension of the second convex point punching area (606); the first convex point punching area (605) is arranged at one end where the surface layer (1) is connected to the front waist area (301), and the second convex point punching area (606) is arranged at one end where the surface layer (1) is connected to the back waist area (302).

6. The urine and feces absorbing diaper with double-layer centrally-combined surface layers according to claim 1, characterized in that: The absorbent core (2) comprises an upper non-woven fabric (201), a fluffy fabric (202) and a lower non-woven fabric (203) arranged from top to bottom; the end surface of one side of the fluffy fabric (202) which is bonded to the upper non-woven fabric (201) is provided with first polymer water-absorbing particles (204); the end surface of one side of the fluffy fabric (202) which is bonded to the lower non-woven fabric (203) is provided with second polymer water-absorbing particles (205); and a third permeable hole (206) is provided in the thickness direction of the upper non-woven fabric (201); the cross-sectional shape of the third permeable hole (206) is V-shaped.

7. A production process for urine and feces absorbing diapers, characterized in that: The following steps are involved: Step 1, a manufacturing process of the bottom layer (3), unwinding the rolled bottom layer (3) non-woven fabric so that the layer with the waterproof and breathable film faces upward, and cutting the bottom layer (3) out of the bottom layer (3) non-woven fabric by a knife roller; Step 2, glue spraying process, applying glue by dispensing at the position of the bottom layer (3) corresponding to the front waist area (301) to form a first bonding point (303), applying glue by hanging at the position of the bottom layer (3) corresponding to the back waist area (302) to form a second bonding point (304), and applying glue at the edge positions on both sides of the composite area of ​​the bottom layer (3) and the absorbent core (2) to form a composite bonding area (8); Step 3, a sidewall laminating process, laminating the bottom and outer part of the first leakproof sidewall (401) and the second leakproof sidewall (402) with the composite bonding area (8), wherein the inner side of the first leakproof sidewall (401) and the inner side of the second leakproof sidewall (402) extend into the interlayer between the absorbent core (2) and the bottom layer (3); Step 4, a core composite process, placing the absorbent core (2) between the first and second partition edges corresponding to the bottom layer (3), and composite the absorbent core (2) with the inner composite bonding area (8) by lamination; Step 5, preparing a composite surface layer (1), stacking a hot air non-woven fabric layer (101) and a hydrophilic spunbond non-woven fabric layer (102) in order from top to bottom, spraying an adhesive layer (103) on the surface of the hydrophilic spunbond non-woven fabric layer (102) by atomization, and pressing the hot air non-woven fabric layer (101) and the hydrophilic spunbond non-woven fabric layer (102) by a pressing roller, and synchronously forming a diamond-shaped perforated area (5) and a convex point perforated area (6) during the compounding; Step 6, a surface layer (1) composite process, placing the prepared composite surface layer (1) on the upper layer of the absorbent core (2), and composite the surface layer (1) and the bottom layer (3) on both sides of the surface layer (1) by ultrasonic spot welding; Step 7, a folding process for the bottom layer (3), wherein a first elastic spandex yarn (305) is arranged at a position of the bottom layer (3) corresponding to the front waist region (301), a second elastic spandex yarn (306) is arranged at a position of the bottom layer (3) corresponding to the back waist region (302), and the end of the bottom layer (3) is folded over to cover the end of the surface layer (1) and the leakproof partition (4).

8. The production process of urine and feces absorbing diapers according to claim 7, characterized in that: In step 1, the surface of the bottom layer (3) is laminated with a breathable waterproof membrane (7), wherein the breathable waterproof membrane (7) is a 16gsm PTFE bottom membrane. Before the bottom layer (3) is laminated with the breathable waterproof membrane (7), the bottom layer (3) is subjected to a microporous treatment, which specifically includes: Step 1.1, preheating roller treatment: softening and initially bonding the nonwoven fabric fibers by heating; Step 1.2, punching roller treatment: use a needle roller to press micropores on the preheated non-woven fabric, with a pore size of 0.1-1mm; Step 1.3, coating with a rubber roller: coating hot melt adhesive with a rubber roller after punching, and simultaneously conveying the breathable and waterproof membrane (7) for compounding; Step 1.4, cooling roller shaping: the bottom layer (3) after being laminated with the breathable waterproof membrane (7) is quickly cooled to solidify the adhesive layer.

9. The production process of urine and feces absorbing diapers according to claim 7, characterized in that: In step 2, the number of the composite bonding areas (8) is two, both of which are formed by scraper coating, the inner side of the composite bonding area (8) is bonded to the absorbent core (2) and the bottom layer (3), and the outer side of the composite bonding area (8) is bonded to the leakproof partition (4) and the bottom layer (3).

10. The production process of urine and feces absorbing diapers according to claim 7, characterized in that: In step 7, the first elastic spandex is stretched and arranged transversely along the width direction of the front waist region (301), and forms a convex cavity 1 between two first bonding points (303) adjacent to each other in the longitudinal direction and in the transverse direction through elastic contraction; After being stretched, the second elastic spandex yarn (306) is arranged transversely along the width direction of the rear waist region (302), and forms a second protruding cavity between two second bonding points (304) adjacent to each other in the longitudinal direction and in the transverse direction through elastic contraction.

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