A multi-layer precise alignment composite device and method for a nursing pad

Abstract

The present invention discloses a multi-layer precise alignment composite device and method for a nursing pad, and relates to the field of layered products. The composite device comprises: an equipment frame, two groups of laminating mechanisms installed on the side of the equipment frame for providing composite pressure, and a pressure-bearing frame arranged at the bottom of the laminating mechanism; the bottoms of the two groups of laminating mechanisms are respectively equipped with a pre-compression composite mechanism for pre-compression composite of the core layer of the nursing pad and a post-compression composite mechanism for post-compression composite of the entire nursing pad; by realizing a stepped pressing operation, combining the layered pressure of the pre-compression composite and the main pressure composite, the material displacement caused by the sudden change of pressure is reduced, and the precise alignment control of the edge of the core layer is realized, the material overflow rate of the edge binding area of ​​the nursing pad is significantly reduced, and the interlayer bonding strength and the hot pressing composite efficiency are improved at the same time, which not only improves the aesthetics of the product, but also further improves its water absorption performance and edge sealing effect.

Description

Technical Field

[0001] The present invention relates to the technical field of layered products, and in particular to auxiliary operations related to a lamination method, and specifically to a multi-layer precise alignment composite device and method for a nursing pad. Background Art

[0002] In the field of sanitary products, nursing pads are an important absorbent product widely used in baby care, adult incontinence care and feminine hygiene products. The structural design of traditional nursing pads usually includes three layers: the bottom layer is a polyethylene (PE) film, which mainly plays a waterproof and moisture-proof role; the top layer is a non-woven fabric, which provides a soft and comfortable touch; and the core layer located between the top and bottom layers, which is a mixture of fluff pulp and high molecular absorbent resin (SAP), responsible for absorbing and locking liquids to keep the surface dry.

[0003] During the manufacturing process of multi-layer nursing pads, the bottom layer, top layer and core layer need to be precisely aligned and laminated together. Hot pressing lamination technology is widely used because of its high efficiency, environmental protection and ability to ensure close bonding between layers. When the three layers of materials are stacked and hot pressed, the length and width of the bottom PE film and the top non-woven fabric are usually designed to be slightly larger than the core layer, so that the edges of the core layer can be formed after lamination, thereby enhancing the edge sealing and overall structural stability of the product.

[0004] However, during the hot pressing process, part of the fluff pulp fibers in the core layer often overflow to the hemming area under pressure, which not only affects the aesthetics of the product, but also may reduce its water absorption performance and edge sealing effect, thus affecting user experience and product service life.

[0005] Therefore, it is necessary to improve the deficiencies in the prior art to solve the above problems. Summary of the invention

[0006] The present invention overcomes the deficiencies of the prior art and provides a multi-layer precise alignment composite device and method for a nursing pad.

[0007] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a multi-layer precise alignment compounding device for a nursing pad, comprising: a device frame, two sets of laminating mechanisms installed on the side of the device frame for providing compounding pressure, and a pressure-bearing frame arranged at the bottom of the laminating mechanism;

[0008] The bottoms of the two groups of laminating mechanisms are respectively equipped with a pre-laminating mechanism for pre-pressing and laminating the core layer of the nursing pad and a post-laminating mechanism for post-pressing and laminating the entire nursing pad; the top of the equipment frame is equipped with a translation mechanism for transferring the pressure frame to the laminating area;

[0009] The pre-lamination mechanism comprises: a pre-pressing plate installed at the output end of the laminating mechanism for providing partial pressure coverage and laminating temperature to the core layer, and an airflow component arranged on the pre-pressing plate for providing an annular air curtain to the edge of the core layer;

[0010] The post-combination mechanism comprises: a post-pressing plate installed at the output end of the laminating mechanism for providing pressure coverage and composite temperature to the nursing pad as a whole; a surface of the post-pressing plate is provided with a plurality of exhaust micro-holes for exhausting air during the laminating process.

[0011] In a preferred embodiment of the present invention, the bottom of the pre-pressing plate is a convex structure, and the length and width of the convex structure are smaller than the length and width of the core layer; the pre-pressing plate and the rear pressing plate both provide a composite temperature by means of heat conduction or heat radiation.

[0012] In a preferred embodiment of the present invention, the airflow component includes: a tortuous flow channel opened on the inner side of the pre-pressing plate near the edge, a plurality of air nozzles fixed at the bottom of the pre-pressing plate, and a plurality of gas supply heads installed on the top of the pre-pressing plate for connecting external gas supply equipment to realize gas supply.

[0013] In a preferred embodiment of the present invention, the interior of the air nozzle and the air delivery head are both connected to the interior of the meandering flow channel; a plurality of the air nozzles are evenly distributed in a linear array at the bottom of the meandering flow channel to provide an annular air curtain to the bottom of the pre-pressing plate; the air nozzle is in a vertical state with respect to the pressure frame.

[0014] In a preferred embodiment of the present invention, the laminating mechanism includes: a support frame installed on the side of the equipment frame, a hydraulic cylinder fixed on the top of the support frame, and an output block installed on the hydraulic cylinder at the output end of the bottom of the support frame; the bottom of the output block is fixed to the top of the pre-pressing plate or the rear pressing plate through a plurality of connecting rods, so as to transmit the composite pressure provided by the hydraulic cylinder.

[0015] In a preferred embodiment of the present invention, a plurality of slide rails are installed on one side of the support frame facing the output block, a plurality of sliders are fixed on one side of the output block, and one side of the slider is slidably connected to one side of the slide rail.

[0016] The present invention provides a compounding method of a multi-layer precise alignment compounding device for a nursing pad, comprising the following steps:

[0017] S1. Align the bottom layer, core layer and top layer of the nursing pad to be composited from bottom to top and place them on the top of the pressure frame, and move the pressure frame to the lamination area at the bottom of the pre-pressing plate through the translation mechanism;

[0018] S2, through the laminating mechanism, drive the pre-pressing plate to apply a certain composite pre-pressure to the top direction of the pressure frame, so that the bottom part of the pre-pressing plate covers the core layer for pre-compounding. During the process, an annular air curtain is provided to the edge of the core layer through the airflow component;

[0019] S3. After pre-lamination, the pressure frame is transferred to the lamination area at the bottom of the rear platen through the translation mechanism;

[0020] S4. Through the laminating mechanism, the rear pressing plate is driven to apply a certain post-compounding pressure toward the top of the pressure frame, so that the bottom of the rear pressing plate covers the entire nursing pad for post-compounding. During the process, the internal gas of the core layer is discharged through the exhaust micropores to achieve precise alignment and lamination.

[0021] In a preferred embodiment of the present invention, in the step S2, the pre-pressure is 0.1-0.2 MPa; the pre-composition temperature is 80-90°C, and the time is 1.5-3 s; the distance between the side edge covered by the bottom part of the pre-compression plate and the side edge of the core layer is 2-6 mm.

[0022] In a preferred embodiment of the present invention, in step S2, the air flow velocity of the annular air curtain is 3-5 m / s, the air flow temperature is 40-50° C., and the distance between the annular air curtain and the edge of the core layer is 2-10 mm.

[0023] In a preferred embodiment of the present invention, in the step S4, the post-compounding pressure is 0.5-0.8 MPa; the post-compounding temperature is 110-120° C., and the time is 0.8-1.5 s.

[0024] The present invention solves the defects existing in the background technology and has the following beneficial effects:

[0025] (1) The present invention provides a multi-layer precise alignment composite device and method for a nursing pad. The device realizes a stepped pressing operation by cooperating with two sets of laminating mechanisms respectively with a pre-combination mechanism and a post-combination mechanism. The layered pressure of pre-compression composite and main-compression composite is combined to reduce the material displacement caused by sudden pressure changes, realizes precise alignment control of the edge of the core layer, significantly reduces the material overflow rate of the hemming area of ​​the nursing pad, and improves the inter-layer bonding strength and hot pressing composite efficiency at the same time, which not only improves the aesthetics of the product, but also further improves its water absorption performance and edge sealing effect.

[0026] (2) In the present invention, an air flow assembly is arranged on the pre-pressing plate. During the pre-compounding pressure application process, the air delivery head, the meandering flow channel and the air nozzle cooperate with each other. Since the air nozzles are evenly distributed at the bottom of the meandering flow channel in a linear array and are perpendicular to the pressure frame, the gas can be sprayed out in a vertical posture to form an annular air curtain covering the edge of the core layer, thereby inhibiting the diffusion of the fluff pulp fibers at the edge of the core layer during pre-compounding, thereby helping to prevent the displacement or deformation of the core layer edge material and further reducing the material overflow rate in the hemming area.

[0027] (3) In the present invention, the appropriate distance between the annular air curtain and the edge of the core layer can ensure the synergistic effect of the annular air curtain, effectively inhibit the flow of fibers, avoid damage to the fiber structure, maintain a low overflow rate and ensure the stability of the edge of the core layer.

[0028] (4) In the present invention, exhaust micropores are provided on the surface of the rear pressing plate, which helps to discharge excess gas during the compounding process, thereby preventing the formation of bubbles inside the nursing pad that may cause interlayer separation or structural deformation, thereby affecting the compounding quality and the final use effect of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 is a three-dimensional structural diagram of a composite device according to a preferred embodiment of the present invention;

[0031] Figure 2 It is a connection structure of a laminating mechanism and a pre-combining mechanism of a preferred embodiment of the present invention and a partial enlarged view thereof;

[0032] Figure 3 It is a connection structure of the laminating mechanism and the post-combination mechanism of a preferred embodiment of the present invention and a partial enlarged view thereof;

[0033] Figure 4 This is a top view of a half-section structure of a pre-pressing plate according to a preferred embodiment of the present invention;

[0034] In the figure: 1. Equipment frame; 2. Laminating mechanism; 21. Support frame; 22. Hydraulic cylinder; 23. Output block; 24. Slide rail; 25. Slider; 3. Pressure frame; 4. Pre-lamination mechanism; 41. Pre-pressing plate; 42. Ring flow channel; 43. Air nozzle; 44. Air delivery head; 5. Post-lamination mechanism; 51. Post-pressing plate; 52. Exhaust micropores; 6. Translation mechanism. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0037] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood by specific circumstances.

[0038] like Figure 1 , Figure 2 and Figure 3 As shown, a multi-layer precision alignment composite equipment for nursing pads comprises: an equipment frame 1, two sets of laminating mechanisms 2 installed on the side of the equipment frame 1 for providing composite pressure, and a pressure frame 3 arranged at the bottom of the laminating mechanism 2; the bottoms of the two sets of laminating mechanisms 2 are respectively installed with a pre-compression composite mechanism 4 for pre-compression composite of the core layer of the nursing pad and a post-compression composite mechanism 5 for post-compression composite of the nursing pad as a whole; the top of the equipment frame 1 is installed with a translation mechanism 6 for calling the pressure frame 3 to the lamination area; the pre-compression composite mechanism 4 comprises: a pre-compression plate 41 installed at the output end of the laminating mechanism 2 for providing partial pressure coverage and composite temperature to the core layer, and an airflow component arranged on the pre-compression plate 41 for providing an annular air curtain to the edge of the core layer; the post-compression composite mechanism 5 comprises: a post-compression plate 51 installed at the output end of the laminating mechanism 2 for providing pressure coverage and composite temperature to the nursing pad as a whole; the surface of the post-compression plate 51 is provided with a plurality of exhaust micropores 52 for exhausting air during the lamination process.

[0039] It should be noted that the bottom of the pre-pressure plate 41 is a convex structure, and the length and width of the convex structure are smaller than the length and width of the core layer; the pre-pressure plate 41 and the rear pressure plate 51 both provide composite temperature by means of heat conduction or heat radiation; the translation mechanism 6 includes at least a linear guide rail for guiding the pressure frame 3 to adjust the direction, a ball slider sliding on the top of the linear guide rail for connecting the pressure frame 3, and a power source for driving the pressure frame 3 to perform linear motion. The specific mechanical structure is common knowledge in the field, so this application no longer explains the control method and structure in detail, and no detailed description is made here.

[0040] Specifically, the laminating mechanism 2 provides a composite pressure. On the one hand, it can drive the pre-pressing plate 41 to move toward the top of the pressure frame 3, provide a composite temperature for the composite nursing pad to be pre-laminated, and utilize the convex structure at the bottom of the pre-pressing plate 41. Since the length and width of the convex structure are smaller than the length and width of the core layer, the core layer can be locally pre-compounded and pressurized, so that the edge of the core layer produces a pre-lamination deformation, forming a physical barrier zone, and restricting the fiber flow in the subsequent pressurization stage. At the same time, with the cooperation of the airflow component, an annular air curtain is provided to the edge of the core layer for synergistic effect; on the other hand, it can drive the rear pressure plate 51 to fully cover the entire pre-compounded nursing pad, provide a composite temperature for post-lamination, and achieve melt bonding between the bottom PE film and the top non-woven fabric. And ensure that the remaining edges of the core layer are subjected to uniform pressure to achieve a close fit between the multiple layers of materials. At the same time, the exhaust micropores 52 on the surface of the rear pressing plate 51 help to discharge excess gas during the compounding process, avoiding the formation of bubbles inside the nursing pad that may cause interlayer separation or structural deformation, affecting the composite quality and the final use effect of the product; and then through a step-by-step pressing operation, combined with the layered pressure of pre-pressing and main pressing, the material displacement caused by sudden pressure changes is reduced, and precise positioning control of the edge of the core layer is achieved, which significantly reduces the material overflow rate in the hemming area of ​​the nursing pad, while improving the interlayer bonding strength and hot pressing efficiency, which not only improves the aesthetics of the product, but also further improves its water absorption performance and edge sealing effect.

[0041] like Figure 2 and Figure 4 As shown, in some embodiments, the airflow component includes: a tortuous flow channel 42 opened on the inner side of the pre-pressing plate 41 near the edge, a plurality of air nozzles 43 fixed at the bottom of the pre-pressing plate 41, and a plurality of gas supply heads 44 installed on the top of the pre-pressing plate 41 for connecting external gas supply equipment to realize gas supply.

[0042] It should be noted that the interiors of the air nozzle 43 and the air delivery head 44 are connected to the interior of the meandering channel 42; a number of air nozzles 43 are evenly distributed in a linear array at the bottom of the meandering channel 42, and are used to provide an annular air curtain to the bottom of the pre-load plate 41; the air nozzle 43 is vertical to the pressure frame 3, and is located around the convex structure of the pre-load plate 41.

[0043] Specifically, after the gas delivery head 44 is connected to a gas delivery device for gas supply, during the pre-compounding pressurization process, the pressurized gas can be delivered to the meandering channel 42 through the gas delivery head 44, and sprayed out through a plurality of air nozzles 43 at the bottom of the pre-pressing plate 41. Since the plurality of air nozzles 43 are evenly distributed at the bottom of the meandering channel 42 in a linear array and are perpendicular to the pressure frame 3, the gas can be sprayed out in a vertical posture to form an annular air curtain covering the edge of the core layer, thereby inhibiting the diffusion of the fluff pulp fibers at the edge of the core layer during pre-compounding, thereby helping to prevent the displacement or deformation of the core layer edge material and further reducing the material overflow rate in the hemming area.

[0044] In some embodiments, the laminating mechanism 2 includes: a support frame 21 installed on the side of the equipment frame 1, a hydraulic cylinder 22 fixed on the top of the support frame 21, and an output block 23 installed on the hydraulic cylinder 22 at the output end at the bottom of the support frame 21; the bottom of the output block 23 is fixed to the top of the pre-pressing plate 41 or the rear pressing plate 51 through a plurality of connecting rods, so as to transmit the composite pressure provided by the hydraulic cylinder 22.

[0045] It should be noted that the hydraulic cylinder 22 is controlled by an external hydraulic control system. The hydraulic control system is powered by an electric motor, uses a hydraulic pump to convert mechanical energy into pressure, pushes the hydraulic oil, and controls various valves to change the flow direction of the hydraulic oil, thereby pushing the hydraulic cylinder 22 to perform movements of different strokes and directions. The specific structure is a universal standard part or a part known to technicians in this field, and will not be described in detail here.

[0046] Specifically, the support frame 21 is used to fix the hydraulic cylinder 22, and the output block 23 at the output end can be driven by the hydraulic cylinder 22. The output pressure is transmitted through the connecting rod to provide a composite pressure to the pre-pressure plate 41 or the rear pressure plate 51, thereby realizing graded pressure application, so that the composite pressure can be stably and controllably transmitted to the nursing pad, ensuring the smooth progress of the composite process.

[0047] In some embodiments, a plurality of slide rails 24 are installed on one side of the support frame 21 facing the output block 23 , a plurality of sliders 25 are fixed on one side of the output block 23 , and one side of the slider 25 is slidably connected to one side of the slide rail 24 .

[0048] Specifically, when the driving force of the hydraulic cylinder 22 is transmitted to the output block 23, the slide rail 24 installed on the support frame 21 can limit the lateral displacement of the output block 23 by cooperating with the slider 25, thereby ensuring that the pressure transmission direction is vertical, and helping to maintain the stability of the pre-pressure plate 41 or the rear pressure plate 51 during the composite process, thereby avoiding affecting the composite quality due to shaking.

[0049] A method for compounding a multi-layer precise alignment compounding device for a nursing pad comprises the following steps:

[0050] S1, align the bottom layer, core layer and top layer of the nursing pad to be composited, and place them on the top of the pressure frame 3 from bottom to top, and move the pressure frame 3 to the lamination area at the bottom of the pre-pressing plate 41 through the translation mechanism 6;

[0051] S2, through the laminating mechanism 2, drive the pre-pressing plate 41 to apply a certain composite pre-pressure to the top direction of the pressure frame 3, so that the bottom part of the pre-pressing plate 41 covers the core layer for pre-compounding. During the process, an annular air curtain is provided to the edge of the core layer through the airflow component;

[0052] S3, after pre-lamination, the pressure frame 3 is moved to the lamination area at the bottom of the rear pressing plate 51 through the translation mechanism 6;

[0053] S4, through the laminating mechanism 2, drive the rear pressing plate 51 to apply a certain post-compounding pressure toward the top direction of the pressure-bearing frame 3, so that the bottom of the rear pressing plate 51 covers the entire nursing pad for post-compounding. During the process, the internal gas of the core layer is discharged through the exhaust micropores 52 to achieve precise alignment and lamination.

[0054] In some specific embodiments, in step S2, the pre-pressure is 0.1-0.2 MPa; the pre-compounding temperature is 80-90°C, and the time is 1.5-3 s; the distance between the side edge covered by the bottom part of the pre-compression plate 41 and the side edge of the core layer is 2-6 mm.

[0055] In some specific embodiments, in step S2, the air flow velocity of the annular air curtain is 3-5 m / s, and the air flow temperature is 40-50 °C. Through the synergistic effect of the air flow temperature and the pre-pressing temperature, the shrinkage deformation of the material caused by the temperature difference can be avoided; the distance between the annular air curtain and the edge of the core layer is 2-10 mm.

[0056] In some specific embodiments, in step S4, the post-pressure is 0.5-0.8 MPa; the post-compounding temperature is 110-120° C., and the time is 0.8-1.5 s.

[0057] In order to further make the purpose and effect of the present invention simple and easy to understand, the present invention is further explained in combination with the following specific embodiments and comparative examples; wherein the distance between the side edge covered by the bottom portion of the pre-pressing plate 41 and the side edge of the core layer is 3.5 mm (that is, the length dimension of the convex structure is smaller than the length and width dimensions of the core layer, and the distance between the side edge of the convex structure and the side edge of the core layer is 3.5 mm).

[0058] Example 1

[0059] A method for compounding a multi-layer precise alignment compounding device for a nursing pad comprises the following steps:

[0060] S1, align the bottom layer (length and width 50 cm*50 cm), the core layer (length and width 45 cm*45 cm) and the top layer (length and width 50 cm*50 cm) of the nursing pad to be composited from bottom to top and place them on the top of the pressure frame 3, and move the pressure frame 3 to the lamination area at the bottom of the pre-pressing plate 41 through the translation mechanism 6;

[0061] S2, through the laminating mechanism 2, drive the pre-pressing plate 41 to apply a composite pre-pressure of 0.2 MPa toward the top of the pressure frame 3, so that the bottom part of the pre-pressing plate 41 covers the core layer, and pre-compounds for 2 s at 85 ° C. During the process, the airflow component provides an annular air curtain to the edge of the core layer at a speed of 4 m / s with a 50 ° C airflow, so that the distance between the annular air curtain and the edge of the core layer is 5 mm;

[0062] S3, after pre-lamination, the pressure frame 3 is moved to the lamination area at the bottom of the rear pressing plate 51 through the translation mechanism 6;

[0063] S4. Drive the rear pressing plate 51 to apply a post-compounding pressure of 0.6 MPa toward the top of the pressure frame 3 through the laminating mechanism 2, so that the bottom of the rear pressing plate 51 covers the entire nursing pad. Post-compound for 1 s at 110 °C. During the process, the gas inside the core layer is discharged through the exhaust micropores 52 to achieve precise alignment and lamination.

[0064] Example 2

[0065] This embodiment is basically the same as Embodiment 1, except that in step S2, the distance between the annular air curtain and the edge of the core layer is 7 mm.

[0066] Example 3

[0067] This embodiment is basically the same as Embodiment 1, except that in step S2, the distance between the annular air curtain and the edge of the core layer is 10 mm.

[0068] Example 4

[0069] This embodiment is basically the same as Embodiment 1, except that in step S2, the distance between the annular air curtain and the edge of the core layer is 2 mm.

[0070] Comparative Example 1

[0071] This comparative example is basically the same as Example 1, except that conventional hot pressing lamination is adopted, i.e., steps S1 and S2 are omitted.

[0072] Comparative Example 2

[0073] This comparative example is basically the same as Example 1, except that in step S2, no annular air curtain is used to assist in the pre-compounding process.

[0074] Comparative Example 3

[0075] This comparative example is basically the same as Example 1, except that in step S2, the distance between the annular air curtain and the edge of the core layer is 1 mm.

[0076] Comparative Example 4

[0077] This comparative example is basically the same as Example 1, except that in step S2, the distance between the annular air curtain and the edge of the core layer is 12 mm.

[0078] Performance testing: The nursing pads prepared in Examples 1-4 and Comparative Examples 1-4 were tested for the overflow rate and adhesive strength of the hemming area.

[0079] Overflow rate test: Place the pad in a constant temperature and humidity environment for 24 hours to eliminate the effects of temperature and humidity on material expansion, separate the edge area of ​​the nursing pad, record the quality of the original core layer, peel off the PE film and non-woven fabric in the edge area, retain the overflowed fibers of the core layer, and calculate the overflow rate: .

[0080] Adhesion strength test: refer to GB / T 2792-2014 "Test method for peel strength of adhesive tape", and perform three parallel tests to obtain the average value.

[0081] The test results of the overflow rate and the adhesive strength of the hemming area of ​​the nursing pads prepared in Examples 1-4 and Comparative Examples 1-4 are shown in Table 1.

[0082] Table 1: Performance test results

[0083]

[0084] It can be seen from Table 1 that:

[0085] By comparing Example 1 with Comparative Example 1, it can be learned that through stepped pressing and pre-pressing curing, the material displacement caused by sudden pressure change is effectively reduced, and the precise positioning control of the edge of the core layer is achieved, and the material overflow rate of the hemming area can be reduced from 1.7% of the traditional process to below 0.4%. In addition, due to the weak bonding force between the fiber and the matrix, the hemming area is not firmly bonded, and the interface stress concentration area is prone to peeling, resulting in the traditional process of Comparative Example 1. Compared with the step process of this Example 1, the interlayer bonding strength is reduced by 30%.

[0086] By comparing Examples 1-4 with Comparative Example 2, it can be learned that by pre-pressing and curing to cause pre-lamination deformation at the edge of the core layer to form a physical barrier zone, the synergistic assistance of the annular air curtain can effectively inhibit the diffusion of the fluff pulp fibers at the edge of the core layer during pre-lamination deformation, thereby reducing the material overflow rate in the hemming area.

[0087] By comparing Examples 1-4 with Comparative Example 3, it can be learned that the appropriate distance between the annular air curtain and the edge of the core layer can ensure the synergistic effect of the annular air curtain, effectively suppress the flow of fibers, avoid damage to the fiber structure, maintain a low overflow rate and ensure the stability of the edge of the core layer. When the distance between the annular air curtain and the edge of the core layer is too close, the shear stress generated by the high-speed flowing gas will be significant, directly acting on the edge of the core layer to produce a strong blowing effect, causing the edge fibers to be easily blown away or displaced, and thus not only the annular air curtain assistance is not used reasonably, but also a higher overflow rate and a decrease in the interlayer bonding strength in the edging area are produced compared to the absence of annular air curtain assistance.

[0088] By comparing Examples 1-4 with Comparative Example 4, it can be learned that when the annular air curtain is too far away from the edge of the core layer, it is easy for the airflow to form a non-contact action area with the edge of the core layer, and the high-speed airflow is prone to generate eddies or turbulence during the free diffusion process, and reversely entrain the loose fibers or particles at the edge of the core layer, causing overflow, thereby failing to maintain a low overflow rate and high bonding strength.

[0089] The above is based on the ideal embodiment of the present invention. Through the above description, it is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0090] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A multi-layer precise alignment composite equipment for nursing pads, characterized in that: include: An equipment frame, two sets of laminating mechanisms installed on the side of the equipment frame for providing composite pressure, and a pressure-bearing frame arranged at the bottom of the laminating mechanisms; The bottoms of the two groups of laminating mechanisms are respectively equipped with a pre-laminating mechanism for pre-pressing and laminating the core layer of the nursing pad and a post-laminating mechanism for post-pressing and laminating the entire nursing pad; the top of the equipment frame is equipped with a translation mechanism for transferring the pressure frame to the laminating area; The pre-lamination mechanism comprises: a pre-pressing plate installed at the output end of the laminating mechanism for providing partial pressure coverage and laminating temperature to the core layer, and an airflow component arranged on the pre-pressing plate for providing an annular air curtain to the edge of the core layer; the distance between the annular air curtain and the edge of the core layer is 2-10 mm; The post-combination mechanism comprises: a post-pressing plate installed at the output end of the laminating mechanism for providing pressure coverage and composite temperature to the nursing pad as a whole; a surface of the post-pressing plate is provided with a plurality of exhaust micro-holes for exhausting air during the laminating process; The bottom of the pre-pressing plate is a convex structure, the length and width of the convex structure are smaller than the length and width of the core layer, and the distance between the side of the convex structure and the side of the core layer is 2-6 mm; the pre-pressing plate and the rear pressing plate both provide composite temperature by means of heat conduction or heat radiation.

2. A multi-layer precise alignment composite equipment for nursing pads according to claim 1, characterized in that: The airflow assembly includes: a circular flow channel opened on the inner side of the pre-pressing plate near the edge, a plurality of air nozzles fixed on the bottom of the pre-pressing plate, and a plurality of gas supply heads installed on the top of the pre-pressing plate for connecting external gas supply equipment to realize gas supply.

3. A multi-layer precise alignment composite equipment for nursing pads according to claim 2, characterized in that: The interior of the air nozzle and the air delivery head are both connected to the interior of the meandering channel; a plurality of the air nozzles are evenly distributed in a linear array at the bottom of the meandering channel to provide an annular air curtain to the bottom of the pre-pressing plate; the air nozzles are in a vertical state with respect to the pressure frame.

4. The multi-layer precise alignment composite equipment for nursing pads according to claim 1, characterized in that: The laminating mechanism includes: a support frame installed on the side of the equipment frame, a hydraulic cylinder fixed on the top of the support frame, and an output block installed on the hydraulic cylinder at the output end at the bottom of the support frame; the bottom of the output block is fixed to the top of the pre-pressing plate or the rear pressing plate through a plurality of connecting rods, so as to transmit the composite pressure provided by the hydraulic cylinder.

5. A multi-layer precise alignment composite equipment for nursing pads according to claim 4, characterized in that: A plurality of slide rails are installed on one side of the support frame facing the output block, a plurality of sliders are fixed on one side of the output block, and one side of the slider is slidably connected to one side of the slide rail.

6. A compounding method of a multi-layer precise alignment compounding device for a nursing pad according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. Align the bottom layer, core layer and top layer of the nursing pad to be composited from bottom to top and place them on the top of the pressure frame, and move the pressure frame to the lamination area at the bottom of the pre-pressing plate through the translation mechanism; S2, through the laminating mechanism, drive the pre-pressing plate to apply a certain composite pre-pressure to the top direction of the pressure frame, so that the bottom part of the pre-pressing plate covers the core layer for pre-compounding. During the process, an annular air curtain is provided to the edge of the core layer through the airflow component; S3. After pre-lamination, the pressure frame is transferred to the lamination area at the bottom of the rear platen through the translation mechanism; S4. Through the laminating mechanism, the rear pressing plate is driven to apply a certain post-compounding pressure toward the top of the pressure frame, so that the bottom of the rear pressing plate covers the entire nursing pad for post-compounding. During the process, the internal gas of the core layer is discharged through the exhaust micropores to achieve precise alignment and lamination.

7. A compounding method of a multi-layer precise alignment compounding device for a nursing pad according to claim 6, characterized in that: In the step S2, the pre-pressure is 0.1-0.2 MPa; the pre-compounding temperature is 80-90°C, and the time is 1.5-3 s.

8. The compounding method of the multi-layer precise alignment compounding device for a nursing pad according to claim 6, characterized in that: In the step S2, the air flow velocity of the annular air curtain is 3-5 m / s, and the air flow temperature is 40-50°C.

9. The compounding method of the multi-layer precise alignment compounding device for a nursing pad according to claim 6, characterized in that: In the step S4, the post-pressure is 0.5-0.8 MPa; the post-compounding temperature is 110-120° C., and the time is 0.8-1.5 s.

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