Preparation process of composite core body

Abstract

The invention relates to a preparation process of a composite core body, which comprises the steps of first absorption layer forming, primary glue spraying, second core body forming, secondary glue spraying, second absorption layer forming and core body main body forming, the middle part of the top of the second core body is fixed only through a dotted second glue spraying part, and the two sides of the top of the second core body are not fixed by glue. When the top of the second core body absorbs a large amount of urine, the second core body can expand, and the flow guide groove provides enough expansion space for the second glue spraying part, so that the stripping force of the absorption core body is large, and the liquid absorption space of the second core body can be instantly increased; the first glue spraying part adopts the point-shaped first glue spraying points, so that the bottom of the second core body can expand after absorbing water, the whole second core body has a good expansion effect, the water locking and water absorbing capacity of the second core body is greatly improved, and the technical problems that the expansion space of the core body is limited, and the flow guiding and liquid absorbing effects are poor are solved.

Description

Technical Field

[0001] The invention relates to the field of disposable sanitary products, and in particular to a preparation process of a composite core. Background Art

[0002] The core of existing disposable sanitary products is generally made of two or more materials with different properties. The core contains flow-conducting materials and water-absorbing materials, such as wood pulp and SAP. When the core absorbs liquid, the core will expand. Non-woven fabrics are provided on the top and bottom surfaces of the core. The non-woven fabrics are fully fixed by glue. The glue will inhibit the expansion of the core, making the peeling force of the core small, thereby reducing the flow-conducting and liquid-absorbing effects of the core.

[0003] Chinese patent application number: 202122074493.1, discloses a new soft absorbent core, including a water-absorbent gel fluffy cloth layer and a non-woven fabric layer. The water-absorbent gel fluffy cloth layer refers to a fluffy cloth that uniformly adsorbs acrylic gel inside and outside, and the water-absorbent gel fluffy cloth layer is covered with a non-woven fabric layer on the top and bottom. The new soft absorbent core has a water-absorbent gel fluffy cloth layer to improve the water absorption performance of the core. The core is breathable, soft and light, without granularity, making the wearer more comfortable. When the absorbent core absorbs liquid, it will swell. Non-woven fabrics are provided on the top and bottom surfaces of the absorbent core. The non-woven fabrics are fully fixed with glue. The glue will inhibit the expansion of the absorbent core, making the peeling force of the absorbent core small, thereby reducing the diversion and liquid absorption effect of the absorbent core. Summary of the invention

[0004] Therefore, in view of the above problems, the present invention proposes a preparation process of a composite core, which solves the technical problems of limited expansion space of the core and poor guiding and liquid absorption effects.

[0005] To achieve the above object, the present invention adopts the following technical solutions: A process for preparing a composite core comprises the following steps: S1. Forming of the first absorption layer: The non-woven fabric layer is transported through the die wheel, and the first polymer material is fed to the non-woven fabric layer by the first polymer material feeding device, so that the first core body is formed on the non-woven fabric layer, and the first absorption layer is formed; S2. One-time glue spraying: The lower non-woven fabric is conveyed, and the second polymer feeding device includes a second feeding bin, a die wheel arranged at the bottom of the second feeding bin, a first driving device for driving the die wheel to rotate, and an adsorption device connected to the die wheel. Before the lower non-woven fabric enters the second feeding bin, the first glue spraying device sprays glue on the top surface of the lower non-woven fabric to form a plurality of first glue spraying parts, the first glue spraying parts are arranged along the length direction, and the first glue spraying parts include a plurality of first glue spraying points in a dot shape; S3. Second core forming: The lower non-woven fabric enters the second feeding bin, and the outer wall of the die wheel has a plurality of adsorption areas arranged along the length direction, each adsorption area is arranged at intervals, and a plurality of adsorption holes are arranged on the adsorption area. The lower non-woven fabric is a breathable non-woven fabric, and an adsorption cavity is arranged in the die wheel. The adsorption cavity generates adsorption force to adsorb the second polymer material discharged from the second feeding bin onto the adsorption area, and a strip-shaped second core body is formed on each adsorption area, and a guide groove is formed between adjacent second core bodies, and the second core body is fixed on the lower non-woven fabric through the first glue spraying point; S4. Secondary spraying: After the lower non-woven fabric leaves the second lower bin, the second glue spraying device sprays glue on the top of each second core to form a second glue spraying portion, the second glue spraying portion is arranged along the length direction, the second glue spraying portion is located in the middle of the second core, and the second glue spraying portion includes a plurality of dot-shaped second glue spraying points; S5. Second absorption layer molding: The upper non-woven fabric is compounded on a plurality of second core bodies by a first compounding device, and the upper non-woven fabric is fixed to the second core bodies by a second glue spraying unit; S6. Core body molding: The first absorbent layer and the second absorbent layer are compounded by a second compounding device to form a core body.

[0006] Further: The outer edge of the mold wheel has convex strips arranged along the length direction, the convex strips are distributed around the outer edge of the mold wheel, and the convex strips can separate each second core body.

[0007] Before step S2, the lower layer of non-woven fabric enters the mold wheel, on which a guide roller is rotatably provided, which is driven by a second driving device, and on which a groove corresponding to the convex strip is provided, and the lower layer of non-woven fabric is clamped between the guide roller and the mold wheel, so that the lower layer of non-woven fabric can be tightly attached to the mold wheel.

[0008] Before step S4, the lower layer of non-woven fabric and the second core body pass through an unfolding device, which includes a bottom roller, an unfolding roller, and a third driving device for driving the bottom roller and the unfolding roller to rotate. The unfolding roller is provided with an unfolding strip corresponding to the guide groove. The lower layer of non-woven fabric and the second core body are clamped between the bottom roller and the unfolding roller to unfold the lower layer of non-woven fabric.

[0009] The convex strips include multiple diamond-shaped convex parts, which are connected end to end in a ring arrangement. The core body is used on disposable sanitary products. The width of the guide groove gradually decreases from the middle to both sides, and the front and rear ends of two adjacent second cores abut against each other.

[0010] The interval distance between the second glue spraying points sprayed by the second glue spraying device gradually decreases from large to small, and then gradually increases from small to large, and the cycle is repeated. The core body is used on disposable sanitary products, and the distance between the second glue spraying points of each core body gradually decreases from the middle to the front and rear ends.

[0011] The interval distance between the first glue spraying points sprayed by the first glue spraying device gradually decreases from large to small, and then gradually increases from small to large, and the cycle is repeated. The core body is used on disposable sanitary products, and the distance between the first glue spraying points of each core body gradually decreases from the middle to the front and rear ends.

[0012] The number of the first glue spraying parts on each second core is two, and the first glue spraying points of the two first glue spraying parts are arranged alternately.

[0013] The thickness of the second core is 2 to 6 times the thickness of the first core.

[0014] Before step S5, the upper non-woven fabric is cut by a cutting roller, and a plurality of through holes are cut on the upper non-woven fabric, wherein the through holes are located above the guide groove.

[0015] By adopting the above technical solution, the beneficial effects of the present invention are: The middle part of the top of the second core of the present invention is fixed only by the dot-shaped second glue spraying part, and the two sides of the top of the second core are not fixed by the glue. When the top of the second core absorbs a large amount of urine, the second core can expand, and the second glue spraying part will hardly affect the expansion of the second core. The guide groove provides sufficient expansion space for the second glue spraying part, so that the peeling force of the absorbent core is large, and the liquid absorption space of the second core can be instantly increased; the guide groove also has the function of diversion, which can increase the diffusion and infiltration speed of urine. The second glue spraying part is a dot-shaped second glue spraying point structure, and some of the second glue spraying points may fall off under force, thereby increasing the peeling force of the absorbent core; the first glue spraying part adopts the dot-shaped first glue spraying point, so that the bottom of the second core can also expand after absorbing water, and the second core as a whole has a good expansion effect, which greatly improves the water locking and water absorption capacity of the second core; the molding of multiple second cores does not require cutting, nor does it need to be separated after cutting to form a guide groove, and does not adopt traditional processes. The present invention adopts the second polymer material to fall directly on the lower non-woven fabric for molding, which simplifies the process, shortens the production line, and improves production efficiency. Furthermore, the convex strips can separate each second core body to prevent adjacent second core bodies from being connected together; further, the lower non-woven fabric is sprayed on the die wheel for the first time. Before spraying, the lower non-woven fabric is conveyed close to the die wheel by the guide roller, thereby improving the accuracy of the first spraying; further, the unfolding device can unfold the lower non-woven fabric, which is beneficial for the second spraying; further, the width of the guide groove gradually decreases from the middle to both sides. This structure can effectively prevent leakage from the front and rear ends. The middle part of the second core body absorbs a large amount of liquid and expands more. The guide groove can provide a larger expansion space; further, by The amount of urine that needs to be absorbed in the middle part is large, the density of the second glue spraying points at the front and rear ends is large, and the fixing effect is good. The density in the middle part is small, and the fixing effect is poor. The middle part of the second core is easy to expand, and the second glue spraying points are easy to fall off. On the one hand, the peeling force of the middle part of the second core can be improved, and on the other hand, the first glue spraying points and the second glue spraying points of the second core can be prevented from falling off mostly or completely, and the second core can be prevented from moving or falling off; further, the amount of liquid absorbed at the bottom of the second core is less than that at the top. Therefore, the first glue spraying part at the bottom of the second core is two, which improves the fixing effect and prevents the position of the second core from shifting after expansion. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the core body production process of the present invention.

[0017] Figure 2 It is a schematic diagram of the structure of the second lower material bin and the die wheel.

[0018] Figure 3 It is a partial cross-sectional view of the die wheel.

[0019] Figure 4 It is a structural schematic diagram of the guide roller.

[0020] Figure 5 It is a structural schematic diagram of the unfolding device.

[0021] Figure 6 It is a simplified cross-sectional view of the core body.

[0022] Figure 7 It is a schematic diagram of the structure of the second core.

[0023] Figure 8 It is a structural schematic diagram of the second glue spraying part on the top of the second core body.

[0024] Fig. 9 It is a structural schematic diagram of the first glue spraying part at the bottom of the second core body.

[0025] Fig.10 It is a schematic diagram of another structure of the second core guide groove.

[0026] Reference numerals: 1. Core body; 11. First absorption layer; 111. First core; 112. Non-woven fabric layer; 12. Second absorption layer; 121. Lower non-woven fabric layer; 122. Second core; 123. Upper non-woven fabric layer; 124. First glue spraying unit; 1240. First glue spraying point; 125. Second glue spraying unit; 1250. Second glue spraying point; 126. Guide groove; 2. First polymer feeding device; 3. Second polymer feeding device; 31. Second feeding bin; 310. Thickness Baffle; 32, die wheel; 321, adsorption area; 322, adsorption hole; 323, convex strip; 3230, material guide part; 33, first driving device; 34, adsorption device; 35, guide roller; 350, groove; 36, second driving device; 41, first glue spraying device; 42, second glue spraying device; 43, first composite device; 44, second composite device; 5, unfolding device; 51, bottom roller; 52, unfolding roller; 520, unfolding strip; 53, third driving device. DETAILED DESCRIPTION

[0027] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0028] refer to Figures 1 to 10 This embodiment provides a process for preparing a composite core, comprising the following steps: S1. Forming of the first absorption layer 11: The non-woven fabric layer 112 is transported through the die wheel 32 , and the first polymer material blanking device 2 blanks the first polymer material onto the non-woven fabric layer 112 , forming the first core body 111 on the non-woven fabric layer 112 , and the first absorbent layer 11 is formed.

[0029] S2. One-time glue spraying: The lower layer of non-woven fabric 121 enters the mold wheel 32. A guide roller 35 is rotatably provided on the mold wheel 32. The guide roller 35 is driven by a second driving device 36. A groove 350 corresponding to the convex strip 323 is provided on the guide roller 35. The lower layer of non-woven fabric 121 is clamped between the guide roller 35 and the mold wheel 32, so that the lower layer of non-woven fabric 121 can be tightly attached to the mold wheel 32.

[0030] The lower layer of non-woven fabric 121 is transported, and the second polymer feeding device 3 includes a second feeding bin 31, a die wheel 32 arranged at the bottom of the second feeding bin 31, a first driving device 33 for driving the die wheel 32 to rotate, and an adsorption device 34 connected to the die wheel 32. Before the lower layer of non-woven fabric 121 enters the second feeding bin 31, the first glue spraying device 41 sprays glue on the top surface of the lower layer of non-woven fabric 121 to form a plurality of first glue spraying portions 124. The first glue spraying portion 124 is arranged along the length direction, and the first glue spraying portion 124 includes a plurality of first glue spraying points 1240 in the form of dots.

[0031] The outer edge of the mold wheel 32 has convex strips 323 arranged along the length direction. The convex strips 323 are distributed around the outer edge of the mold wheel 32 . The convex strips 323 can separate each second core 122 .

[0032] S3. Forming of the second core 122: The lower layer of non-woven fabric 121 enters the second feeding bin 31, and the outer wall of the die wheel 32 has multiple adsorption areas 321 arranged along the length direction. Each adsorption area 321 is arranged at intervals, and multiple adsorption holes 322 are provided on the adsorption area 321. The lower layer of non-woven fabric 121 is a breathable non-woven fabric. An adsorption cavity is provided in the die wheel 32. The adsorption cavity generates adsorption force to adsorb the second polymer material discharged from the second feeding bin 31 onto the adsorption area 321. A strip-shaped second core body 122 is formed on each adsorption area 321, and a guide groove 126 is formed between adjacent second core bodies 122. The second core body 122 is fixed to the lower layer of non-woven fabric 121 through a first glue spraying point 1240.

[0033] S4. Secondary spraying: The lower layer of non-woven fabric 121 and the second core body 122 pass through the unfolding device 5, which includes a bottom roller 51, an unfolding roller 52, and a third driving device 53 for driving the bottom roller 51 and the unfolding roller 52 to rotate. The unfolding roller 52 is provided with an unfolding strip 520 corresponding to the guide groove 126. The lower layer of non-woven fabric 121 and the second core body 122 are clamped between the bottom roller 51 and the unfolding roller 52 to unfold the lower layer of non-woven fabric 121.

[0034] After the lower layer of non-woven fabric 121 leaves the second lower hopper 31, the second glue spraying device 42 sprays glue on the top of each second core body 122 to form a second glue spraying portion 125. The second glue spraying portion 125 is arranged along the length direction. The second glue spraying portion 125 is located in the middle of the second core body 122. The second glue spraying portion 125 includes a plurality of dot-shaped second glue spraying points 1250.

[0035] S5. Forming of the second absorption layer 12: The upper non-woven fabric 123 is composited onto the plurality of second core bodies 122 by the first composite device 43 , and the upper non-woven fabric 123 and the second core bodies 122 are fixed by the second glue spraying unit 125 .

[0036] S6. Core body 1 molding: The first absorbent layer 11 and the second absorbent layer 12 are compounded by a second compounding device 44 to form the core body 1 .

[0037] In one embodiment, the interval distance of the second glue spraying points 1250 sprayed by the second glue spraying device 42 gradually decreases from large to small, and then gradually increases from small to large, and the cycle is repeated. The core body 1 is used on disposable sanitary products. Figure 8 The distance between the second glue spraying points 1250 of each core body 1 gradually decreases from the middle to the front and rear ends.

[0038] In one embodiment, the interval distance of the first glue spraying points 1240 sprayed by the first glue spraying device 41 gradually decreases from large to small, and then gradually increases from small to large, and the cycle is repeated. The core body 1 is used on disposable sanitary products. Fig. 9 The distance between the first glue spraying points 1240 of each core body 1 gradually decreases from the middle to the front and rear ends.

[0039] In one embodiment, reference Fig. 9 The number of the first glue spraying parts 124 on each second core body 122 is two, and the first glue spraying points 1240 of the two first glue spraying parts 124 are arranged alternately.

[0040] refer to Fig.10 In another embodiment, the convex strip 323 includes a plurality of rhombus-shaped convex portions, which are connected end to end in a ring arrangement, and the core body 1 is used on disposable sanitary products. The width of the guide groove 126 gradually decreases from the middle to both sides, and the front and rear ends of the two adjacent second core bodies 122 abut against each other.

[0041] In one embodiment, the upper non-woven fabric 123 is cut by a cutting roller, and a plurality of through holes are cut on the upper non-woven fabric 123 , and the through holes are located above the guide groove 126 .

[0042] In one embodiment, the guide roller 35 may not be provided. In this structure, the glue spraying may be offset once, and the guide roller 35 is provided according to specific circumstances.

[0043] In one embodiment, the unfolding device 5 may not be provided. In this structure, when the lower non-woven fabric 121 is not fully unfolded, the second core 122 and the upper non-woven fabric 123 may be compounded, and deviations may occur. The arrangement is specific according to the circumstances.

[0044] The thickness of the second core 122 is generally set to be 2 to 6 times the thickness of the first core 111 .

[0045] The first driving device 33, the second driving device 36 and the third driving device 53 may adopt motor components or other devices, which are well-known devices and will not be described in detail here.

[0046] The first glue spraying device 41 , the second glue spraying device 42 , the first composite device 43 and the second composite device 44 are well-known devices and will not be described in detail herein.

[0047] The above-mentioned lower layer non-woven fabric 121 is usually made of elastic fabric. When the lower layer non-woven fabric 121 is made of elastic fabric, it can be appropriately stretched and contracted to improve the diversion effect. During production, it also has a certain buffering effect and can make adaptive adjustments according to the force applied to it to prevent the fabric from being damaged by a large force. The lower layer non-woven fabric 121 can also be made of other fabrics, depending on the specific situation.

[0048] In one embodiment, reference Figure 2 A thick baffle 310 is provided in the second material discharge bin 31, and the thick baffle 310 divides the second material discharge bin 31 into multiple material discharge areas. The thick baffle 310 corresponds to the guide groove 126, and the material discharge area corresponds to the adsorption area 321. A large amount of second polymer material passes through the blocking of the thick baffle 310, and a large amount of second polymer material falls from the material discharge area to the adsorption area 321.

[0049] In one embodiment, reference Figure 3 A material guide portion 3230 is provided on the top surface of the convex strip 323, and the material guide portion 3230 is inclined downward along the direction of the adsorption area 321. Most of the second polymer material will fall on the adsorption area 321 due to the adsorption force, and a small amount of the second polymer material will fall on the convex strip 323 and slide to the adsorption area 321 through the material guide portion 3230. The material guide portion 3230 is an inverted U-shaped structure.

[0050] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A process for preparing a composite core, characterized in that: The following steps are involved: S1. Forming of the first absorption layer: The non-woven fabric layer is transported through the die wheel, and the first polymer material is fed to the non-woven fabric layer by the first polymer material feeding device, so that the first core body is formed on the non-woven fabric layer, and the first absorption layer is formed; S2. One-time glue spraying: The lower non-woven fabric is conveyed, and the second polymer feeding device includes a second feeding bin, a die wheel arranged at the bottom of the second feeding bin, a first driving device for driving the die wheel to rotate, and an adsorption device connected to the die wheel. Before the lower non-woven fabric enters the second feeding bin, the first glue spraying device sprays glue on the top surface of the lower non-woven fabric to form a plurality of first glue spraying parts, the first glue spraying parts are arranged along the length direction, and the first glue spraying parts include a plurality of first glue spraying points in a dot shape; S3. Second core forming: The lower non-woven fabric enters the second feeding bin, and the outer wall of the die wheel has a plurality of adsorption areas arranged along the length direction, each adsorption area is arranged at intervals, and a plurality of adsorption holes are arranged on the adsorption area. The lower non-woven fabric is a breathable non-woven fabric, and an adsorption cavity is arranged in the die wheel. The adsorption cavity generates adsorption force to adsorb the second polymer material discharged from the second feeding bin onto the adsorption area, and a strip-shaped second core body is formed on each adsorption area, and a guide groove is formed between adjacent second core bodies, and the second core body is fixed on the lower non-woven fabric through the first glue spraying point; S4. Secondary spraying: After the lower non-woven fabric leaves the second lower bin, the second glue spraying device sprays glue on the top of each second core to form a second glue spraying portion, the second glue spraying portion is arranged along the length direction, the second glue spraying portion is located in the middle of the second core, and the second glue spraying portion includes a plurality of dot-shaped second glue spraying points; S5. Second absorption layer molding: The upper non-woven fabric is compounded on a plurality of second core bodies by a first compounding device, and the upper non-woven fabric is fixed to the second core bodies by a second glue spraying unit; S6. Core body molding: The first absorbent layer and the second absorbent layer are compounded by a second compounding device to form a core body.

2. The process for preparing a composite core according to claim 1, characterized in that: The outer edge of the mold wheel has convex strips arranged along the length direction, the convex strips are distributed around the outer edge of the mold wheel, and the convex strips can separate each second core body.

3. The process for preparing a composite core according to claim 2, characterized in that: Before step S2, the lower layer of non-woven fabric enters the mold wheel, on which a guide roller is rotatably provided, which is driven by a second driving device, and on which a groove corresponding to the convex strip is provided, and the lower layer of non-woven fabric is clamped between the guide roller and the mold wheel, so that the lower layer of non-woven fabric can be tightly attached to the mold wheel.

4. The process for preparing a composite core according to claim 2, characterized in that: Before step S4, the lower layer of non-woven fabric and the second core body pass through an unfolding device, which includes a bottom roller, an unfolding roller, and a third driving device for driving the bottom roller and the unfolding roller to rotate. The unfolding roller is provided with an unfolding strip corresponding to the guide groove. The lower layer of non-woven fabric and the second core body are clamped between the bottom roller and the unfolding roller to unfold the lower layer of non-woven fabric.

5. The process for preparing a composite core according to claim 2, characterized in that: The convex strips include multiple diamond-shaped convex parts, which are connected end to end in a ring arrangement. The core body is used on disposable sanitary products. The width of the guide groove gradually decreases from the middle to both sides, and the front and rear ends of two adjacent second cores abut against each other.

6. The process for preparing a composite core according to claim 1, characterized in that: The interval distance between the second glue spraying points sprayed by the second glue spraying device gradually decreases from large to small, and then gradually increases from small to large, and the cycle is repeated. The core body is used on disposable sanitary products, and the distance between the second glue spraying points of each core body gradually decreases from the middle to the front and rear ends.

7. The process for preparing a composite core according to claim 1, characterized in that: The interval distance between the first glue spraying points sprayed by the first glue spraying device gradually decreases from large to small, and then gradually increases from small to large, and the cycle is repeated. The core body is used on disposable sanitary products, and the distance between the first glue spraying points of each core body gradually decreases from the middle to the front and rear ends.

8. The process for preparing a composite core according to claim 1, characterized in that: The number of the first glue spraying parts on each second core is two, and the first glue spraying points of the two first glue spraying parts are arranged alternately.

9. The process for preparing a composite core according to claim 1, characterized in that: The thickness of the second core is 2 to 6 times the thickness of the first core.

10. The process for preparing a composite core according to claim 1, characterized in that: Before step S5, the upper non-woven fabric is cut by a cutting roller, and a plurality of through holes are cut on the upper non-woven fabric, wherein the through holes are located above the guide groove.

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