A discontinuous connection process between the suspended core and the diaper body

Abstract

This invention discloses an intermittent connection process between a suspended core and the diaper body. This process relates to the field of absorbent products and comprises the following steps: a) intermittent adhesive spraying, b) adhesive scraping, and c) core bonding. The absorbent core is bonded to the bottom film of the absorbent product through adhesive segments in regions one, two, and three, thereby creating an intermittent connection between the absorbent core and the body. This results in grooves that facilitate urine drainage and cavities that store urine at the bottom of the diaper body. This not only increases the absorption rate of the absorbent core but also increases its absorption area, providing excellent fixation for the absorbent core. The process has fewer steps and is simple to operate, meeting the production needs of large-volume diaper production.

Description

Technical Field

[0001] This invention relates to the field of absorbent products, specifically to an intermittent connection process between a suspended core and the diaper body. Background Technology

[0002] In existing technologies, some diapers connect the absorbent core to the main body by bonding and fixing both ends longitudinally, such as the connection structure between the core and the main body disclosed in CN206577045U. This connection method forms an inner pocket for holding urine between the two parts of the diaper. There is no connection between the absorbent core and the bottom film. The absorbent core is suspended inside the diaper. This type of absorbent core is also called a "suspended core". After the suspended core absorbs urine, some of the urine is absorbed through the surface of the suspended core, while the rest continues to permeate downwards into the inner pocket. The urine in the inner pocket is absorbed by the absorbent core through the secondary surface of the core. Thus, the surfaces of the suspended core and the inner pocket do not come into contact with each other, thereby increasing the urine absorption area of ​​the suspended core and improving the urine absorption speed.

[0003] However, the suspension core and the main body have the following defects: (1) Since urine generally flows from the front end of the diaper in the longitudinal direction to the rear end in the longitudinal direction, and is affected by gravity in this process, the conduction of urine in the longitudinal direction will be weakened, thus causing the absorption capacity of the suspension core in the longitudinal direction to be continuously weakened; (2) Except for the two ends of the suspension core in the longitudinal direction, there is no connection between the suspension core and the bottom film of the diaper. The middle part of the suspension core is prone to positional displacement. If the middle part of the suspension core is offset or overlapped, the absorption effect of the suspension core on urine will be affected, and even side leakage may occur.

[0004] Therefore, it is necessary to design an intermittent connection process between the suspended core and the diaper body. Summary of the Invention

[0005] To address the shortcomings of the aforementioned technologies, this invention provides an intermittent connection process that not only increases the absorption rate of urine by the absorbent core but also increases the absorption area of ​​the absorbent core, provides a good fixation effect on the absorbent core, has fewer process steps and is simple to operate, and can meet the production needs of large-volume diapers.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0007] A discontinuous connection process between a suspended core and the diaper body, comprising the following steps:

[0008] a) Intermittent spraying of adhesive along the longitudinal direction of the absorbent core and on the surface of the nonwoven fabric of the absorbent core layer, forming a spaced adhesive layer on the surface of the nonwoven fabric of the absorbent core layer; the spaced segments of the adhesive layer are divided into spaced segment one, spaced segment two and spaced segment three according to the length in the longitudinal direction; among them, the number of spaced segment three is one or more.

[0009] b) Scraping: The adhesive in the adhesive layer is scraped off along the longitudinal direction and at equal intervals in the transverse direction, forming multiple strip-shaped adhesive segments on the surface of the nonwoven fabric of the absorbent core layer; the regions where the adhesive segments are located are divided according to their length in the longitudinal direction, and the regions where the adhesive segments are located are divided into: Region 1, Region 2 and Region 3; wherein there are two or more Region 3 segments.

[0010] c) Adhesion of the absorbent core: The absorbent core is adhered to the bottom film of the absorbent product through the colloidal segments in Region 1, Region 2 and Region 3; wherein, Region 1 and Region 2 are respectively adhered to the bottom film surface at two ends in the longitudinal direction of the bottom film, and Region 3 is adhered to the bottom film surface outside both ends of the bottom film.

[0011] Furthermore, in step a), the length of the first interval segment in the longitudinal direction is equal to the length of the second interval segment in the longitudinal direction, and the length of the third interval segment in the longitudinal direction is greater than the length of the first interval segment in the longitudinal direction.

[0012] Furthermore, in step b), the length of the colloidal segment in region one in the longitudinal direction is greater than the length of the colloidal segment in region two in the longitudinal direction, and the length of the colloidal segment in region two in the longitudinal direction is greater than the length of the colloidal segment in region three in the longitudinal direction.

[0013] Furthermore, the length of the third interval segment in the longitudinal direction is equal to the length of the colloidal segment in the longitudinal direction within region three.

[0014] Furthermore, the cross-sectional shape of the colloidal segments in regions one and two is Ω-shaped.

[0015] Furthermore, the colloid is composed of a hydrophilic hot melt adhesive.

[0016] Furthermore, the colloidal segments located in the middle of region three have the same length in the lateral direction, the colloidal segments located at both ends of region three have the same length in the lateral direction, and the colloidal segment located in the middle of region three has a shorter length in the lateral direction than the colloidal segments located at both ends of region three.

[0017] The beneficial effects of this invention are as follows:

[0018] This connection process is applied to the connection between the absorbent core and the diaper body. By spraying adhesive onto the surface of the nonwoven fabric of the absorbent core, the absorbent core is connected to the bottom film of the absorbent product, thereby creating an intermittent connection effect between the absorbent core and the bottom film. This results in grooves that guide urine and cavities that store urine at the bottom of the diaper body, which not only increases the absorption rate of urine by the absorbent core but also increases the absorption area of ​​urine by the absorbent core.

[0019] In addition, the multiple adhesive bonding points set in the longitudinal direction can firmly fix the absorbent core to the diaper body. Even after the absorbent core has absorbed urine, it will not loosen or shift its position, thus avoiding side leakage of the diaper.

[0020] This connection process has fewer steps and is simple to operate, which can meet the production needs of large-volume diapers; moreover, the number of adhesive parts can be adjusted according to actual production needs, which can adapt to the production of diapers of different sizes. Attached Figure Description

[0021] Figure 1 This is a flowchart of the process.

[0022] Figure 2 This is a schematic diagram showing the effect after step a) is completed.

[0023] Figure 3 This is a schematic diagram showing the effect after step b) is completed. Detailed Implementation

[0024] like Figures 1-3 As shown, an intermittent connection process between a suspended core and the diaper body comprises the following steps:

[0025] a) Intermittent glue spraying: The glue spraying equipment sprays glue on the surface of the non-woven fabric of the absorbent core layer along the longitudinal direction of the absorbent core. The glue forms a spaced glue layer on the surface of the non-woven fabric of the absorbent core layer. Before scraping the glue, multiple glue layers need to be set on the surface of the non-woven fabric of the absorbent core layer to ensure the tight connection between the surface of the non-woven fabric of the absorbent core layer and the body of the diaper.

[0026] Based on the length in the longitudinal direction, the colloid layer is divided into three segments: segment one, segment two, and segment three. The arrangement of segment one, segment two, and segment three can form a cavity for storing urine at the bottom of the main body after the absorbent core is connected to the main body, thereby increasing the area of ​​the absorbent core for absorbing urine.

[0027] In addition, the number of interval three can be one or more; the number of interval three can be adjusted according to actual production needs. When producing diapers of different sizes, the number of interval three will change accordingly because the position of the absorbent core is fixed differently and the amount of urine absorbed is different.

[0028] b) Scraping: The colloid in the colloid layer is scraped off along the longitudinal direction and at equal intervals in the transverse direction, forming multiple strip-shaped colloid segments on the surface of the nonwoven fabric of the absorbent core layer. After scraping, the colloid layer is divided into several strip-shaped colloid segments, and grooves for guiding urine are formed between two adjacent colloid segments in the transverse direction. These grooves can quickly guide the continuously seeping urine longitudinally, thereby accelerating the absorption speed of urine by the absorbent core.

[0029] The colloidal segment is divided into three regions: Region 1, Region 2, and Region 3, based on its length in the longitudinal direction. The connection between the absorbent core and the main body has different requirements at different locations, therefore, the length of the colloidal segment in the longitudinal direction will also vary. Different connection and fixation effects are achieved by controlling the length of the colloidal segment in different regions. Controlling the length of the colloidal segment affects the amount of colloidal material used; flexible application of colloidal material at different locations can help control production costs and reduce unnecessary expenses.

[0030] In addition, there are two or more Zone 3s; the number of Zone 3s is adjusted according to actual production needs. When producing diapers of different sizes, the number of Zone 3s will change accordingly because the position of the absorbent core is fixed differently and the amount of urine absorbed is different.

[0031] c) Absorbent core bonding: The absorbent core is bonded to the bottom film of the absorbent product via the gel segments in Regions 1, 2, and 3. After the gel segments in Regions 1, 2, and 3 are bonded to the bottom film of the absorbent product, the connection between the absorbent core and the diaper body is established. Regions 1 and 2 are bonded to the bottom film surfaces at two ends in the longitudinal direction of the bottom film, thereby forming a connection between the absorbent core and the diaper body at the bottom of the diaper, similar to that between a suspended core and the diaper body. Then, Region 3 is bonded to the bottom film surfaces outside both ends of the bottom film, forming a connection different from that between a suspended core and the diaper body. In response to the need to fix the ends of the absorbent core in the longitudinal direction to both ends of the diaper body in the longitudinal direction, the gel segments at the ends of the absorbent core in the longitudinal direction are divided into Region 1 or Region 2. By controlling the length of the gel segments in Region 1 or Region 2 in the longitudinal direction, the fixation effect of fixing the ends of the absorbent core in the longitudinal direction to both ends of the diaper body in the longitudinal direction is achieved.

[0032] This bonding process is applied between the absorbent core and the diaper body. By spraying adhesive onto the surface of the non-woven fabric layer beneath the absorbent core, the core is connected to the bottom film of the absorbent product, creating an intermittent connection between the core and the bottom film. This results in grooves that facilitate urine drainage and cavities that store urine at the bottom of the diaper body. This not only increases the absorption rate but also the absorption area. Multiple adhesive bonding points along the longitudinal direction ensure the absorbent core is securely fixed to the diaper body, preventing it from loosening or shifting even after absorption, thus avoiding side leakage. This bonding process has fewer steps and is simple to operate, meeting the needs of large-volume diaper production. Furthermore, the number of adhesive points can be adjusted according to actual production requirements, accommodating diaper production of different sizes.

[0033] In step a), the length of the first interval segment in the longitudinal direction is equal to the length of the second interval segment in the longitudinal direction, and the length of the third interval segment in the longitudinal direction is greater than the length of the first interval segment in the longitudinal direction.

[0034] Since urine continuously seeps downwards, the length of interval segment three is longer than that of interval segment one and interval segment two. This is to create a cavity at the bottom of the diaper when the user is wearing the diaper, which is larger than other parts of the bottom of the diaper, to provide temporary storage space for the continuously seeping urine. This also prevents urine leakage caused by a decrease in the absorption speed of the absorbent core surface when the amount of urine is large.

[0035] In step b), the length of the colloidal segment in region one in the longitudinal direction is greater than the length of the colloidal segment in region two in the longitudinal direction, and the length of the colloidal segment in region two in the longitudinal direction is greater than the length of the colloidal segment in region three in the longitudinal direction.

[0036] Specifically, because the contour of the buttocks exerts a greater force on the diaper when the user is wearing it than the contour of the bladder, and because the buttocks exert a larger pressure area on the diaper when the user is sitting compared to the bladder, resulting in a relatively greater pulling force on the back waistband of the diaper during movement, the adhesive segments attached to the bottom film at both ends in the longitudinal direction must differ in length. In other words, the adhesive segment in region one is suitable for attaching to the back waistband of the diaper, while the adhesive segment in region two is suitable for attaching to the front abdomen of the diaper.

[0037] The length of the third interval segment in the longitudinal direction is equal to the length of the colloidal segment in the longitudinal direction within region three.

[0038] The length of the third interval is the same as the length of the adhesive section in the third region. When spraying adhesive, if the speed of the adhesive spraying device is controlled at a specified value, the time it takes for the working end of the adhesive spraying device to pass through the third interval is the same as the time it takes for the working end of the adhesive spraying device to pass through the third region. Therefore, the operation becomes simpler for the operator when controlling the working end of the adhesive spraying device.

[0039] The cross-sectional shape of the colloidal segments in regions one and two is Ω-shaped.

[0040] Among them, the Ω-shaped colloidal segment can increase the deformability of the reinforcing gel and buffer the external force through deformation when subjected to external pressure, thereby maintaining the tight connection between the absorbent core and the diaper body.

[0041] The colloid is composed of a hydrophilic hot melt adhesive.

[0042] The adhesive used is a hydrophilic hot melt adhesive, which gives the adhesive segments a certain ability to attract water molecules, which helps to stabilize and guide the water in urine, making the diaper less prone to side leakage.

[0043] The colloidal segments located in the middle of region three have the same length in the lateral direction, the colloidal segments located at both ends of region three have the same length in the lateral direction, and the colloidal segment located in the middle of region three has a shorter length in the lateral direction than the colloidal segments located at both ends of region three.

[0044] In particular, the gel segments at both ends of the horizontal direction in region three are located near the edge of the diaper. Since the edge of the diaper is subjected to external forces more frequently while the user is wearing the diaper, and most users are in a tilted position during sleep, the adhesive area near the edge of the diaper must be increased to ensure a tight connection between the core and the main body of the diaper, and to avoid side leakage caused by defects in the tightness of the connection.

[0045] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A discontinuous connection process between a suspended core and the diaper body, characterized in that, The process consists of the following steps: a) Intermittent spraying of adhesive along the longitudinal direction of the absorbent core and on the surface of the nonwoven fabric of the absorbent core layer, forming a spaced adhesive layer on the surface of the nonwoven fabric of the absorbent core layer; the spaced segments of the adhesive layer are divided into spaced segment one, spaced segment two and spaced segment three according to the length in the longitudinal direction; among them, the number of spaced segment three is one or more. b) Scraping: The adhesive in the adhesive layer is scraped off along the longitudinal direction and at equal intervals in the transverse direction, forming multiple strip-shaped adhesive segments on the surface of the nonwoven fabric of the absorbent core layer; the regions where the adhesive segments are located are divided according to their length in the longitudinal direction, and the regions where the adhesive segments are located are divided into: Region 1, Region 2 and Region 3; wherein there are two or more Region 3 segments. c) Adhesion of the absorbent core: The absorbent core is adhered to the bottom film of the absorbent product through the colloidal segments in Region 1, Region 2 and Region 3; Region 1 and Region 2 are respectively adhered to the bottom film surface at two ends in the longitudinal direction of the bottom film, and Region 3 is adhered to the bottom film surface outside both ends of the bottom film. In step a), the length of the first interval segment in the longitudinal direction is equal to the length of the second interval segment in the longitudinal direction, and the length of the third interval segment in the longitudinal direction is greater than the length of the first interval segment in the longitudinal direction. In step b), the length of the colloidal segment in region one in the longitudinal direction is greater than the length of the colloidal segment in region two in the longitudinal direction, and the length of the colloidal segment in region two in the longitudinal direction is greater than the length of the colloidal segment in region three in the longitudinal direction. The length of the third interval segment in the longitudinal direction is equal to the length of the colloidal segment in the longitudinal direction within region three; The cross-sectional shape of the colloidal segment in region one and region two is Ω-shaped; The colloid is composed of a hydrophilic hot melt adhesive; The colloidal segments located in the middle of region three have the same length in the lateral direction, the colloidal segments located at both ends of region three have the same length in the lateral direction, and the colloidal segment located in the middle of region three has a shorter length in the lateral direction than the colloidal segments located at both ends of region three.

Images