CN112402115A

CN112402115A - Vacuum composite core and preparation method thereof

Info

Publication number: CN112402115A
Application number: CN201910776938.5A
Authority: CN
Inventors: 王胜地
Original assignee: Chuzhou Dadai Selection Technology Co ltd
Current assignee: Chuzhou Dadai Selection Technology Co ltd
Priority date: 2019-08-22
Filing date: 2019-08-22
Publication date: 2021-02-26

Abstract

The invention relates to a vacuum composite core, comprising: the core body coating cloth coats the two core body parts through twice folding, and a diversion trench is formed between the two coated core body parts; a glue-free vacuum area is formed between the lower sides of the two core body parts and the core body wrapping cloth. The preparation method of the vacuum composite core body comprises the following steps: coating the surface of two side edges of the core body coating cloth with colloid; placing the two core body parts on two sides of the core body coating cloth; folding the side edge of the core body wrapping cloth inwards for the first time to enable the side edge of the core body wrapping cloth to wrap the end part of the core body part; folding the core wrap cloth a second time together with the core portion; a glue-free vacuum area is formed between the lower sides of the two coated core body parts and the core body coating cloth, and a diversion trench is formed between the two coated core body parts. The vacuum composite core body with the three-dimensional structure can generate a good absorption effect in all directions.

Description

Vacuum composite core and preparation method thereof

Technical Field

The invention relates to a vacuum composite core and a preparation method thereof, relates to the field of sanitary care products, and particularly relates to an absorption core of a paper diaper and an industrial preparation method thereof.

Background

Absorbent cores are an important component of sanitary care products, such as diapers. The paper diaper is used as a disposable sanitary product, is mainly used for absorbing urine, can be discarded after being used, and is suitable for children, old people or people with life disorders.

The paper diaper commonly available on the market at present is generally composed of: the diaper comprises a surface layer, a core body, a rubber band, a three-dimensional protective enclosure, a PE film, a water-repellent bottom layer and the like, wherein the core body is a main component for absorbing urine in the diaper. Due to the different requirements of different people, the design of the diaper core is also different, and usually includes: fluff pulp cores and composite cores. The composite core is a core structure widely applied at present. The composite core body has the advantages of difficulty in forming lump fault and simple preparation process. However, the conventional composite core has insufficient liquid diffusion, and as a result, it is difficult to absorb a large amount of liquid in a short time, so that the utilization rate of the core is low, the leakage rate is high at night, and skin rash may be caused by local high humidity.

Some panty-shape diapers are in order to overcome above-mentioned defect, can set up the guiding gutter in the core, and after the urine got into the absorption core, extend the guiding gutter to absorbing core both sides extension to improve the water conservancy diversion speed and the utilization ratio of absorbing the core. However, such a longitudinally spreading core structure is likely to overflow the absorbent core along the direction of the flow guide grooves at night or when the urine volume is large, causing a leakage phenomenon, and thus causing discomfort to the wearer.

The following problems are common to prior art absorbent cores:

1) the composite core has poor liquid diffusivity, low utilization rate of the core and high leakage probability at night, and can cause the problems of skin rash and the like.

2) The bottom of the absorption core body of the existing paper diaper is tightly attached to the leakproof bottom film, and when the urine volume is large, the core body cannot be absorbed instantly, so that urine extends left and right to the absorption core body, and side leakage is caused.

3) The guiding gutter on the core prolongs a direction diffusion, and when urine volume is big, unable timely absorption, urine spills over the core along the guiding gutter, leads to leaking urine scheduling problem.

In view of the above, it is desired to develop a core having a rapid absorption capacity, thereby improving the absorption rate and utilization rate of the whole diaper and reducing the probability of leakage.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provide a novel vacuum composite core body with a three-dimensional structure, which can generate good absorption effect in the transverse direction, the longitudinal direction and the thickness direction.

According to the present invention there is provided a vacuum composite core comprising: the core body comprises two core body parts and core body coating cloth, wherein the two core body parts are coated on the side edges of the core body coating cloth through two folds in the length direction, and a diversion trench is formed between the two coated core body parts.

The core part includes in proper order: upper strata non-woven fabrics, upper macromolecular material layer, fluffy cotton layer, lower floor's macromolecular material layer and lower floor's non-woven fabrics, the lower surface of upper strata non-woven fabrics with lower floor's non-woven fabrics pass through the colloid respectively in upper strata macromolecular material layer with the macromolecular material layer joint of lower floor.

And a glue-free vacuum area is arranged between the lower sides of the two coated core body parts and the core body coating cloth.

The bottom side of the end part of the core part close to the diversion groove part is connected with the side edge of the coating cloth through glue, the bottom side of the outer end part of the core part is connected with the coating cloth through glue, and the glue-free vacuum area is formed on the lower side of the core part.

The invention also provides a preparation method of the vacuum composite core, which comprises the following steps: coating the surface of two side edges of the core body coating cloth with colloid; bonding two core body parts to two sides of the core body wrapping cloth; folding the side edge of the core body wrapping cloth inwards for the first time to enable the side edge of the core body wrapping cloth to wrap the end part of the core body part; folding the core wrap a second time along with the core portion; a glue-free vacuum area is formed between the lower sides of the two coated core body parts and the core body coating cloth, and a diversion trench is formed between the two coated core body parts.

The core portion forming step includes: coating colloid on the upper surface of the lower non-woven fabric; applying a lower polymer material layer on the upper surface of the lower non-woven fabric; covering the lower polymer material layer by a fluffy cotton layer; turning and reversing the fluffy cotton layer, the lower high polymer material layer and the lower non-woven fabric layer; applying an upper high molecular material layer on the fluffy cotton layer; and covering the upper high molecular material layer with an upper non-woven fabric coated with colloid.

The vacuum composite core body can effectively solve the problems of low liquid absorption speed and poor diffusivity of a high polymer material, and is beneficial to quickly and massively absorbing liquid; through the core design of three-dimensional (horizontal, vertical and up-down) absorption capacity, make the urine lead to the left and right sides of core and front and back both ends fast, can effectively improve the utilization ratio of core interior polymer, compare with current core structure, the speed of absorbing water is faster, more even, the water absorption capacity is also bigger.

Drawings

FIG. 1 is a schematic cross-sectional view of a vacuum composite core of the present invention;

FIG. 2 is a schematic top view of a vacuum composite core of the present invention;

FIG. 3 is a schematic cross-sectional view of a core of the present invention;

FIG. 4 is a schematic view of a core manufacturing process of the present invention;

FIG. 5 is a schematic view of a manufacturing process of the vacuum composite core according to the present invention.

Detailed Description

To further illustrate the features of the present invention, the following description is given by way of specific embodiments in conjunction with the accompanying drawings, which are given by way of illustration and not of limitation with respect to the preferred embodiments of the present invention.

The use of "upper", "lower", "inner", "outer", and the like in the following description is made in the orientation as shown in the drawings, and it is to be understood that these terms are to be changed accordingly in the event that the drawings are rotated upside down.

Referring to fig. 1 and 2, fig. 1 is a schematic cross-sectional view of a vacuum composite core according to the present invention, and fig. 2 is a schematic top view of the vacuum composite core according to the present invention.

The present invention provides a vacuum composite core 100, which comprises: two core portions 10 and a core covering cloth 105, and the two core portions 10 are covered with the core covering cloth 105 at intervals. Wherein the side edges of the core covering cloth 105 cover the two core portions 10 by two folds in the length direction (front-back direction of fig. 1) and form a flow guide groove 11 between the covered two core portions. Wherein the first fold 13 of the core wrap 105 wraps the sides of the core wrap 105 around one side end of the two core portions 10 and the second fold 14 of the core wrap 105 wraps around the other side end of the two core portions 10. The core-covering cloth 105 is joined to the two core portions 10 by the inside-coated gel, but the gel is not coated in the space between the lower surfaces of the two core portions and the core-covering cloth 105 to form a gel-free vacuum region 110.

As shown in fig. 1 and 3, the core portion 10 includes, in order: the fabric comprises an upper layer of non-woven fabric 103, an upper layer of high molecular material 101, a fluffy cotton layer 106, a lower layer of high molecular material 102 and a lower layer of non-woven fabric 104, wherein the lower surface of the upper layer of non-woven fabric 103 is connected with the upper layer of high molecular material through colloid, and the upper surface of the lower layer of non-woven fabric 104 is connected with the lower layer of high molecular material 102 through colloid 107.

As shown in fig. 1, the bottom side of the end of the core part 10 close to the flow guide groove part is connected with the side of the coating cloth 105 through glue, the bottom side of the outer end of the core part 10 is connected with the coating cloth 105 through glue, and the glue-free vacuum area 110 is formed at the lower side of the core part, namely, no glue is coated between the lower surface of the core part and the coating cloth 105, and liquid can flow freely therein.

The above-mentioned colloid is a hot-melt adhesive used in the production process.

According to the vacuum composite core 100, a region which is not sprayed with hot melt adhesive, namely the adhesive-free vacuum region 110, exists between the lower layer of the core part 10 and the coating cloth 105, when the vacuum composite core 100 is used for manufacturing sanitary products such as paper diapers, the core part (absorber) 10 and the bottom film (coating cloth 105) of the paper diapers are not completely attached, when urine is discharged, the urine can be smoothly diffused to the left side and the right side through the adhesive-free vacuum region which is not completely attached at the position when the urine contacts the core; meanwhile, urine can be upwards diffused through the vacuum area, so that the vertical, left-right, front-back three-dimensional diffusion of the urine is realized, and the absorption of the urine is accelerated. Compared with the common core body, the vacuum composite core body (vacuum absorption core body) provided by the invention increases the contact area between the core body and urine, thereby accelerating the absorption speed of the urine, absorbing most of the urine at the middle section of the core body part, reducing the amount of the urine diffused forwards and backwards, and reducing the risk of front and back leakage of the urine.

The invention also provides a preparation method of the vacuum composite core body, which is used for preparing the vacuum composite core body 100.

Fig. 4 shows a schematic view of a step of forming a core portion (core semi-finished product). As shown in fig. 4, the 1 st nonwoven fabric roll 50 releases the unwound lower layer nonwoven fabric, and the glue (hot melt glue) is applied to the upper surface thereof by the 1 st glue spraying device 53. Meanwhile, the fluffy cotton roller 60 releases the fluffy cotton, and the high molecular water-absorbing material is applied between the fluffy cotton and the lower non-woven fabric through the hopper 61 1 before the fluffy cotton is jointed with the lower non-woven fabric. Due to the action of the hot melt adhesive, the fluffy cotton is jointed with the lower non-woven fabric, and the high polymer water absorption material is stored between the fluffy cotton and the lower non-woven fabric. The turning roller turns and overturns the jointed fluffy cotton and the lower non-woven fabric, so that the fluffy cotton faces upwards and is conveyed along the arrow direction. The No. 2 hopper 62 releases the high molecular water absorbent material above the fluffy cotton and continues to transport downstream. Meanwhile, the 2 nd nonwoven fabric roller 51 releases and unfolds the upper layer nonwoven fabric, and the 2 nd glue spraying device 54 is used for spraying hot melt glue on the joint surface with the fluffy cotton. The upper layer of non-woven fabric after glue spraying is jointed with the fluffy cotton, and is bonded under the action of the hot melt glue, and the high molecular water absorption material released on the fluffy cotton by the No. 2 hopper 62 is kept between the upper layer of non-woven fabric and the fluffy cotton. And then wound up by a core body semi-finished product roller 70 for use in the next process. The hopper can be a plurality of hoppers which respectively discharge different types of high polymer water absorption materials.

Referring to fig. 5, a schematic diagram of a vacuum composite core manufacturing process of the present invention is shown. The core body semi-finished product roll 71 spreads the semi-finished products of the core portion including two lines of core body semi-finished products conveyed in parallel and transfers them to the next process in the arrow direction. Meanwhile, the wrapping cloth roller 80 spreads and conveys the wrapping cloth for wrapping the core part in the arrow direction, before the wrapping cloth contacts the core part, hot melt adhesive is sprayed to the positions of two sides of the wrapping cloth in the length direction through the adhesive spraying device 81, and the spraying width is slightly wider than the width of the core semi-finished product in each row of the core. Then two rows of core semi-finished products are bonded near two side edges of the wrapping cloth. At the 1 st fold location 84, the side edges of the core wrap are folded inwardly a first time so that the side edges of the core wrap the ends of the sides of the core portion (core blank) and are roll glued to form the first fold 13 shown in FIG. 1. Next, a second fold of the core wrap is made at the 2 nd fold location 86 along with the core portions so that the two first folds 13 are opposed near the center of the wrap, forming channels between the two core portions being wrapped. With the second fold 14 formed as shown in figure 1 being located outside the vacuum composite core. Because no hot melt adhesive is sprayed between the lower sides of the two coated core body parts and the core body coating cloth, a glue-free vacuum area is formed between the lower sides of the two core body parts and the core body coating cloth, and the lower sides of the core body parts and the core body coating cloth are not bonded in the glue-free vacuum area. The manufactured vacuum composite core is rolled up by the vacuum composite core roller 90 so as to be used in the subsequent process of processing sanitary products such as paper diapers and the like.

In the method, the core body parts are coated by the coating cloth through twice folding, so that a diversion trench is formed between the two core body parts, and hot melt glue is not sprayed between the bottom of the core body part and the coating cloth, so that adhesion does not occur, and the formed glue-free vacuum area can enable urine to smoothly diffuse to the left side and the right side through the incompletely-laminated glue-free vacuum area when in use.

In order to test the technical effect of the invention, the sanitary product made of the vacuum composite core body prepared by the preparation method of the invention is compared with the sanitary product (paper diaper) produced by the prior art.

Wherein, the upper layer non-woven fabric adopts SSS spun-bonded non-woven fabric with the width of 1200mm and the gram weight of 15 gsm; the lower non-woven fabric adopts SSS spun-bonded non-woven fabric with the width of 1200mm and the gram weight of 12 gsm; the fluffy cotton is hot air fluffy cotton with the width of 1200mm, the gram weight of 45gsm and the fiber of 4 denier mixed with 6 denier; the coating cloth is SSS spun-bonded non-woven fabric with the width of 250mm and the gram weight of 15 gsm; the width of the core body semi-finished product cut by the method shown in the figure 4 is 55 mm; the width of the first fold in the above described method of figure 5 is 15 mm; the width of the middle of the two parallel core parts (flow guide grooves) is 10 mm. The following comparative data were obtained:

TABLE 1 comparison of the absorption Performance of the inventive vacuum composite core with that of a conventional core (15 pieces for each measurement were averaged)

XL code paper diaper test item	Paper diaper with common core	Paper diaper with vacuum absorption core
			Upper non-woven fabric	15gsm spunbonded nonwoven fabric	15gsm spunbonded nonwoven fabric
Water-absorbing polymer I (weight ratio)	A#(50％)	A#(50％)
			Fluffy cotton	45gsm	45gsm
Water-absorbing polymer II (weight ratio)	B#(50％)	B#(50％)
			Lower non-woven fabric	12gsm spunbonded nonwoven fabric	12gsm spunbonded nonwoven fabric
Wrapping cloth	15gsm spunbonded nonwoven fabric	15gsm spunbonded nonwoven fabric
			Quantity of liquid added at each time	80ml	80ml
Width of groove	0mm	10mm
			First absorption speed S1	11.08s	8.59s
Second absorption speed S2	10.73s	6.09s
			Third absorption Rate S3	10.57s	4.07s
First diffusion length L1	225.00mm	208.13mm
			Second diffusion length L2	266.25mm	222.81mm

As can be seen from the data in Table 1, the absorption speed of the paper diaper with the vacuum absorption core is obviously higher than that of the paper diaper with the ordinary core for the absorption speed with the same liquid adding amount when the ordinary core and the vacuum absorption core which are made of the same raw materials are respectively used in the paper diaper; and the front and back diffusion length of the liquid in the paper diaper is obviously shortened, which shows that the liquid is fully absorbed by the water-absorbing polymer on the diffusion path in the diffusion process, so that the liquid can reach the diffusion length of the common core paper diaper.

From this it can be concluded that: the vacuum absorption core body has higher absorption speed than a common core body, and reduces the risk of leakage of the front and the back of the paper diaper.

It will be apparent to those skilled in the art that the embodiments of the present invention disclosed herein are merely exemplary and that many modifications and variations can be made without departing from the spirit and scope of the invention.

Claims

1. A vacuum composite core, comprising: the core body comprises a core body coating cloth and two core body parts, wherein the two core body parts are coated by two folds of the side edges of the core body coating cloth along the length direction, and a diversion trench is formed between the two coated core body parts.

2. The vacuum composite core of claim 1, wherein a glue-free vacuum region is between the undersides of the two core portions being clad and the core wrap.

3. The vacuum composite core according to claim 2, wherein the bottom side of the end of the core portion near the flow guide groove portion is joined to the side of the coated cloth by glue, and the bottom side of the outer end of the core portion is joined to the coated cloth by glue, forming the glue-free vacuum region on the lower side of the core portion.

4. The vacuum composite core according to any one of claims 1-3, wherein the core portions comprise, in order: upper strata non-woven fabrics, upper macromolecular material layer, fluffy cotton layer, lower floor's macromolecular material layer and lower floor's non-woven fabrics, the lower surface of upper strata non-woven fabrics with lower floor's non-woven fabrics pass through the colloid respectively in upper strata macromolecular material layer with the macromolecular material layer joint of lower floor.

5. A preparation method of a vacuum composite core body is characterized by comprising the following steps: coating the surface of two side edges of the core body coating cloth with colloid; bonding two core body parts to two sides of the core body wrapping cloth; folding the side edge of the core body wrapping cloth inwards for the first time to enable the side edge of the core body wrapping cloth to wrap the end part of the core body part; folding the core wrap a second time along with the core portion; a glue-free vacuum area is formed between the lower sides of the two coated core body parts and the core body coating cloth, and a diversion trench is formed between the two coated core body parts.

6. The method of making a vacuum composite core according to claim 5, wherein the step of forming the core portion comprises: coating colloid on the upper surface of the lower non-woven fabric; applying a lower polymer material layer on the upper surface of the lower non-woven fabric; covering the lower polymer material layer by a fluffy cotton layer; turning to reverse the fluffy cotton layer, the lower high polymer material layer and the lower non-woven fabric layer; applying an upper high molecular material layer on the fluffy cotton layer; and covering the upper high molecular material layer with an upper non-woven fabric coated with colloid.