阅读说明：本技术 一种局部涂布装置及其涂布方法 (Local coating device and coating method thereof ) 是由 蔡吉祥 纪进益 武丹聘 于 2021-06-21 设计创作，主要内容包括：本发明公开了一种局部涂布装置及其涂布方法,所述的局部涂布装置主要由凹辊、针辊、带液辊、刮刀和储液槽组成,涂布液是通过分布于带液辊上的带液孔与涂布液接触,使得涂布液从储液槽中转移到带液孔中,带液辊和打孔辊相互配合,带液孔在和打孔针配合转动时将涂布液从带液孔中转移到打孔针上,从而将在无纺布打孔或压花的同时将涂布液涂覆在无纺布开孔的侧面的,既保证了各涂布区域的涂布量相同,也提高了涂布的均一性,并且涂布的区域也可以通过设计不同的带液孔或打孔针分布来实现。(The invention discloses a local coating device and a coating method thereof, wherein the local coating device mainly comprises a concave roller, a needle roller, a liquid carrying roller, a scraper and a liquid storage tank, the coating liquid is contacted with the coating liquid through liquid carrying holes distributed on the liquid carrying roller, so that the coating liquid is transferred into the liquid carrying holes from the liquid storage tank, the liquid carrying roller is matched with a perforating roller, the coating liquid is transferred onto the perforating needle from the liquid carrying holes when the liquid carrying holes are matched with the perforating needle to rotate, and the coating liquid is coated on the side surface of the non-woven fabric opening while the non-woven fabric is perforated or embossed, so that the coating amount of each coating area is ensured to be the same, the coating uniformity is improved, and the coating areas can be realized by designing different liquid carrying holes or distributing perforating needles.)

1. A topical application device, characterized by: local coating device mainly by concave roller, needle roller, take liquid roller, scraper and reservoir to constitute, concave roller, take the liquid roller respectively with needle roller phase-match, needle roller inside heating device has, its needle roller has the perforating needle on the surface, concave roller on have with the needle roller on the perforating needle assorted shrinkage pool, take the liquid roller on have with the needle roller on perforating needle assorted take the liquid hole, take the liquid roller to be located the top of reservoir to soak in the coating liquid in the reservoir, the scraper be located the side of taking the liquid roller and get rid of unnecessary coating liquid.

2. A topical application device according to claim 1, wherein: the concave roller is also provided with a bulge.

3. A topical application device according to claim 1 or claim 2, wherein: the concave roller is internally provided with a heating device.

4. A topical application device according to claim 2, wherein: the needle roller is provided with a concave matched with the convex.

5. A topical application device according to claim 1, wherein: the local coating device is connected with a pre-punching and embossing compound device, the pre-punching and embossing compound device comprises a pair of first needle rollers and first concave rollers which are meshed with each other, and the first needle rollers are matched with the concave rollers of the local coating device.

6. A partial coating method using a partial coating apparatus according to claim 1, which is produced mainly by the steps of:

1) when the liquid carrying roller immersed in the coating liquid operates, the coating liquid in the liquid storage tank is transferred into the liquid carrying holes of the liquid carrying roller, and a scraper positioned outside the liquid carrying roller removes the redundant coating liquid;

2) the liquid carrying roller and the needle roller transfer the coating liquid from the liquid carrying hole to the perforating needle of the needle roller when the liquid carrying roller and the needle roller rotate in a matching way through the liquid carrying hole and the perforating needle;

3) get into the non-woven fabrics through the deflector roll local coating device, the non-woven fabrics cladding go into on concave roller between concave roller and the needle roller, form the trompil through the impaling of perforating needle, coating liquid coating on the perforating needle simultaneously is in the inboard of non-woven fabrics trompil to form local coating trompil non-woven fabrics, wherein: the heating temperature of the needle roller is 60-150 ℃.

7. A method of topical application according to claim 6, wherein: still have the arch on the concave roller in step 3), have on the needle roll with protruding assorted sunken, the non-woven fabrics cladding go into on the concave roller between concave roller and the needle roll, form the trompil through the impaling of perforating needle, form the knurling through bellied extrusion, coating liquid on the perforating needle is coated in the inboard of non-woven fabrics trompil simultaneously to form local coating trompil knurling non-woven fabrics.

8. A method of topical application according to claim 7, wherein: the heating temperature of the concave roller is 60-150 ℃.

9. A method of topical application according to claim 6 or 7, wherein: and 3) after entering the gluing process through the guide roller, another non-woven fabric enters a space between the concave roller and the needle roller and is overlapped and compounded with the non-woven fabric coated on the concave roller to form holes or embossments, and meanwhile, the coating liquid on the perforating needle is coated on the inner side of the holes of the non-woven fabric, so that the partially coated hole-embossed composite non-woven fabric is formed.

10. A method of topical application according to claim 6 or 7, wherein: step 3) in the non-woven fabrics of cladding on concave roller get into between concave roller and the needle roller before, earlier through a knurling device that punches in advance, the knurling set composite that punches in advance include a pair of intermeshing's first needle roller and first concave roller, wherein first needle roller with local coating unit's concave roller phase-match, the non-woven fabrics is earlier through first concave roller and first needle roller formation trompil or knurling back among the knurling device that punches in advance, again with get into through the deflector roll another non-woven fabrics after the rubberizing process and get into and fold the net compound and form the trompil between first needle roller and the concave roller, then get into and carry out local coating between needle roller and the concave roller to form the compound non-woven fabrics of local coating trompil knurling.

11. A method of topical application according to claim 6, wherein: the depth of the liquid-carrying roller immersed in the coating liquid is 1 mm-10 mm.

Technical Field

The invention relates to the field of non-woven fabrics, in particular to a device for locally coating for improving local performance of non-woven fabrics and a coating method thereof.

Background

The non-woven fabric is a fabric formed without spinning woven fabric, and is formed by only forming a fiber web structure by directionally or randomly arranging textile short fibers or filaments and then reinforcing the fiber web structure by adopting a mechanical method, a thermal bonding method or a chemical method. Because of its light weight, easy to shape, soft and fluffy, it can be used as the main component of absorbent products. When used as a topsheet for absorbent articles such as diapers and sanitary napkins, nonwoven fabrics are capable of rapidly penetrating body fluids into the interior of the absorbent article and then being absorbed by the absorbent core. However, when the absorbent article is under external pressure, absorbed body fluid can easily return to the surface layer non-woven fabric, so that a user feels uncomfortable feelings such as moisture, skin adhesion and the like, and bacteria can be easily generated when the skin is contacted with the moisture absorbent article for a long time, so that the problems of skin redness, allergy and the like are caused. Therefore, the local performance of the non-woven fabric can be improved by means of local coating, and various performances such as hydrophile, water repellency, skin affinity, weak acid and the like can be endowed on the local position of the non-woven fabric. Invention patent application No. cn200980108877.x, patent name: perforated lined perforated nonwoven fabrics are disclosed in which the perforations in the fabric are treated with an active material to cause the inner surface of the perforations to differ in nature, character or appearance from the surface of the fabric adjacent the perforations. In this patent, a sponge roller or a brush roller is used to transfer the coating liquid to the perforating needles, and then the coating liquid on the perforating needles is transferred to the perforated surface of the nonwoven fabric during perforation. However, the sponge roller and the brush roller are difficult to control the amount of the transferred coating liquid when the perforating needles are in contact with each other, so that the amount of the coating liquid on the perforated surface is different, the coating effect is easily uneven in each area, and the expected effect is difficult to achieve.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a device which is even in coating and can locally coat and a coating method thereof.

The technical scheme of the invention is as follows:

the utility model provides a local coating device, local coating device mainly constitute by concave roller, needle roller, liquid roller, scraper and reservoir, concave roller, liquid roller of taking respectively with needle roller phase-match, the needle roller inside heating device that has, its needle roller has the perforating needle on the surface, concave roller on have with needle roller on the perforating needle assorted shrinkage pool, the liquid roller of taking on have with needle roller on perforating needle assorted take the liquid hole, the liquid roller of taking be located the top of reservoir to soak in the coating liquid in the reservoir, the scraper be located the side of taking the liquid roller and get rid of unnecessary coating liquid.

The concave roller is also provided with a bulge.

The concave roller is internally provided with a heating device.

The needle roller is provided with a concave matched with the convex.

The local coating device is connected with a pre-punching and embossing compound device, the pre-punching and embossing compound device comprises a pair of first needle rollers and first concave rollers which are meshed with each other, and the first needle rollers are matched with the concave rollers of the local coating device.

A local coating method adopts the local coating device, and the main production steps comprise:

1) when the liquid carrying roller immersed in the coating liquid operates, the coating liquid in the liquid storage tank is transferred into the liquid carrying holes of the liquid carrying roller, and a scraper positioned outside the liquid carrying roller removes the redundant coating liquid;

2) the liquid carrying roller and the needle roller transfer the coating liquid from the liquid carrying hole to the perforating needle of the needle roller when the liquid carrying roller and the needle roller rotate in a matching way through the liquid carrying hole and the perforating needle;

3) get into local coating device through the deflector roll with the non-woven fabrics, the non-woven fabrics cladding go into on concave roller between concave roller and the needle roller, form the trompil through the impaling of perforating needle, coating liquid coating on the perforating needle simultaneously is in the inboard of non-woven fabrics trompil to form local coating trompil non-woven fabrics, wherein: the heating temperature of the needle roller is 60-150 ℃.

Still have the arch on the concave roller in step 3), have on the needle roll with protruding assorted sunken, the non-woven fabrics cladding go into on the concave roller between concave roller and the needle roll, form the trompil through the impaling of perforating needle, form the knurling through bellied extrusion, coating liquid on the perforating needle is coated in the inboard of non-woven fabrics trompil simultaneously to form local coating trompil knurling non-woven fabrics.

The heating temperature of the concave roller is 60-150 ℃.

And 3) after entering the gluing process through the guide roller, another non-woven fabric enters a space between the concave roller and the needle roller and is overlapped and compounded with the non-woven fabric coated on the concave roller to form holes or embossments, and meanwhile, the coating liquid on the perforating needle is coated on the inner side of the holes of the non-woven fabric, so that the partially coated hole-embossed composite non-woven fabric is formed.

Step 3) the non-woven fabrics of cladding on the concave roller before getting into between concave roller and the needle roller, form trompil or knurling back through first concave roller and first needle roller among the knurling device of punching in advance, again with get into through the deflector roll another non-woven fabrics after the rubberizing process get into between first needle roller and the concave roller and fold the net compound and form the trompil, then get into and carry out local coating between needle roller and the concave roller to form local coating trompil knurling composite non-woven fabrics.

The depth of the liquid-carrying roller immersed in the coating liquid is 1 mm-10 mm.

After the scheme is adopted, the coating liquid is contacted with the coating liquid through the liquid carrying holes distributed on the liquid carrying roller, so that the coating liquid is transferred into the liquid carrying holes from the liquid storage tank, the same and uniform coating liquid amount of the coating liquid transferred into each liquid carrying hole from the liquid storage tank is ensured, and different coating amounts can be controlled by adjusting the depth of the liquid carrying roller immersed into the coating liquid or the depth of the liquid carrying holes; and because the liquid carrying roller is matched with the perforating roller, the liquid carrying hole transfers the coating liquid to the perforating needle from the liquid carrying hole when the liquid carrying hole is matched with the perforating needle to rotate, so that the coating liquid is coated on the side surface of the hole of the non-woven fabric when the non-woven fabric is perforated or embossed, the liquid carrying hole and the perforating needle are distributed in one-to-one correspondence, the coating amount of each coating area is ensured to be the same, the coating uniformity is further improved, and the coating areas can also be realized by designing different liquid carrying holes or perforating needle distributions. Meanwhile, the local coating device can coat colorless hydrophilic coating liquid or functional coating liquid and colored ink on the open pore area of the non-woven fabric, and the original performance of the non-woven fabric is not damaged, and various different performances can be endowed to the non-woven fabric in the open pore area of the non-woven fabric.

Drawings

FIG. 1a is a schematic view of a local coating apparatus and coating according to embodiment 1 of the present invention;

FIG. 1b is a top view of a partially coated apertured nonwoven fabric according to example 1 of the present invention;

FIG. 1c is a cross-sectional view of a partially coated apertured nonwoven fabric in the O-O' direction according to example 1 of the present invention;

FIG. 2a is a schematic view of a local coating apparatus and coating according to embodiment 2 of the present invention;

FIG. 2b is a top view of a partially coated apertured embossed nonwoven fabric of example 2 of the present invention;

FIG. 2c is a cross-sectional view of a partially coated apertured embossed nonwoven fabric in the direction of P-P' in accordance with example 2 of the present invention;

FIG. 3a is a schematic view of a local coating apparatus and coating according to embodiment 3 of the present invention;

FIG. 3b is a top view of the partially coated apertured embossed composite nonwoven fabric of example 3 of the present invention;

FIG. 3c is a cross-sectional view taken in the direction Q-Q' of a partially coated, apertured, embossed composite nonwoven fabric according to example 3 of the present invention;

FIG. 4a is a schematic view of a local coating apparatus and coating according to embodiment 4 of the present invention;

FIG. 4b is a top view of the partially coated apertured embossed composite nonwoven fabric of example 4 of the present invention;

FIG. 4c is a cross-sectional view of a partially coated, apertured, embossed composite nonwoven fabric in the R-R' direction according to example 4 of the present invention.

Detailed Description

The technical solution of the present invention will be further illustrated and described with reference to the accompanying drawings by means of specific embodiments.

Example 1

As shown in fig. 1a, 1B and 1C, a local coating device is composed of a concave roller a1, a needle roller B1, a liquid carrying roller C1, a scraper E1 and a liquid storage tank D1, wherein the concave roller a1 and the liquid carrying roller C1 are respectively matched with the needle roller B1, the surface of the needle roller B1 is provided with a perforated needle B1, the concave roller a1 is provided with a concave hole a1 matched with the perforated needle B1 on the needle roller B1, the liquid carrying roller C1 is provided with a liquid carrying hole C1 matched with the perforated needle B1 on the needle roller B1, the liquid carrying roller C1 is positioned above the liquid storage tank D1 and is immersed in a coating liquid D1 in the liquid storage tank D1, and the scraper E1 is positioned at the side of the liquid carrying roller C1 to remove excessive coating liquid D1.

During coating, 1) the liquid carrying roller C1 immersed in the coating liquid D1 transfers the coating liquid D1 in the liquid storage tank D1 to the liquid carrying hole C1 of the liquid carrying roller C1 during operation, and the scraper E1 positioned outside the liquid carrying roller C1 removes the redundant coating liquid D1, wherein: coating liquid d1 is a colorless hydrophilic oil agent, and the depth of the liquid carrying roller C1 immersed in coating liquid d1 is 1 mm; 2) liquid carrying roller C1 and needle roller B1 transfer coating liquid d1 from liquid carrying hole C1 to perforating needle B1 of needle roller B1 when liquid carrying hole C1 and perforating needle B1 are cooperated to rotate; 3) the water-repellent non-woven fabric 11 enters the local coating device through a guide roller F1, the water-repellent non-woven fabric 11 is coated on a concave roller A1 and enters between a concave roller A1 and a needle roller B1, wherein: the heating temperature of the needle roller B1 was 120 ℃, the opening h1 was formed by piercing of the perforating needle B1, and the coating liquid d1 on the perforating needle B1 was coated on the inside s1 of the nonwoven fabric opening h1, thereby forming the partially coated open-cell nonwoven fabric 12, in which: the surface of the partially coated apertured nonwoven fabric 12 is water-repellent, and the hydrophilic coating liquid d1 is applied only to the inside s1 of the apertures h 1.

Because the non-woven fabric 12 is a water-repellent non-woven fabric, only the inner side s1 of the opening h1 of the non-woven fabric is provided with a hydrophilic coating, when the non-woven fabric 12 is used for a surface layer of a sanitary towel or a paper diaper, when a consumer uses the non-woven fabric, discharged body fluid is in contact with the surface of the non-woven fabric 12, the body fluid is not easy to remain between the water-repellent fibers of the surface layer and can be guided into the opening h1 of the non-woven fabric due to low surface tension of the water-repellent fibers, and the surface tension of the inner side s1 of the opening h1 is increased to be equivalent to the body fluid due to the hydrophilic coating liquid d1 coated on the inner side s1 of the opening h1, so that the body fluid is not easy to permeate back to the surface of the non-woven fabric in contact with the skin, and a dry and comfortable feeling is brought to the body fluid. Meanwhile, in the production process, the coating liquid d1 is transferred to the punching needle b1 through the liquid carrying hole C1 on the liquid carrying roller C1 and then transferred to the inner side s1 of the non-woven hole h1 through the punching needle b1, and the local coating device is adopted to ensure that the coating liquid amount transferred from the liquid storage tank to each liquid carrying hole is the same and uniform, and the coating amount of each coating area of the non-woven fabric is the same. Meanwhile, coating and punching are carried out synchronously, so that the processing steps are reduced, and coating dislocation is prevented.

Example 2

As shown in fig. 2a, 2B and 2C, a partial coating apparatus is composed of a concave roller a2, a needle roller B2, a liquid carrying roller C2, a doctor blade E2 and a liquid storage tank D2, the concave roller a2 and the liquid carrying roller C2 are respectively matched with the needle roller B2, the surface of the needle roller B2 is provided with a concave f2 matched with a concave B2 of the concave roller a2 on the concave roller a2, the concave roller a2 is provided with a concave a2 matched with a concave B2 of the needle roller B2 and is also provided with a convex E2, the liquid carrying roller C2 is provided with a liquid carrying hole C2 matched with a concave B2 of the needle roller B2, the liquid carrying roller C2 is positioned above the liquid storage tank D2 and is immersed in the coating liquid D2 in the liquid storage tank D2, and the doctor blade E2 is positioned at the D2 where the side surface of the liquid carrying roller C2 is removed.

During coating, 1) the liquid carrying roller C2 immersed in the coating liquid D2 transfers the coating liquid D2 in the liquid storage tank D2 to the liquid carrying hole C2 of the liquid carrying roller C2 during operation, and the scraper E2 positioned outside the liquid carrying roller C2 removes the redundant coating liquid D2, wherein: coating liquid d2 is a colored hydrophilic ink, and the liquid carrying roller C2 is immersed into the coating liquid d2 to a depth of 3 mm; 2) liquid carrying roller C2 and needle roller B2 transfer coating liquid d2 from liquid carrying hole C2 to perforating needle B2 of needle roller B2 when liquid carrying hole C2 and perforating needle B2 are cooperated to rotate; 3) the hydrophilic non-woven fabric 21 enters the local coating device through a guide roller F2, the water-repellent non-woven fabric 21 is coated on a concave roller A2 and enters between a concave roller A2 and a needle roller B2, wherein: the heating temperature of the concave roller a2 was 130 ℃, the heating temperature of the needle roller B2 was 110 ℃, the opening h2 was formed by piercing of the perforating needle B2, the embossing i2 was formed by pressing of the projection e2, and the coating liquid d2 on the perforating needle B2 was coated on the inner side s2 of the opening h2 of the nonwoven fabric, thereby forming the partially coated open-faced embossed nonwoven fabric 22, in which: the surface of the partially coated apertured embossed nonwoven fabric 22 has apertures h2 and protrusions i2, and the coating liquid d2 is applied on the inner side s2 of the apertures h 2.

Since the coating liquid d2 locally coated in the embodiment is transferred to the liquid carrying holes C2 by being distributed on the liquid carrying roller C2, the coating liquid amount of the coating liquid d2 transferred from the liquid storage tank to each liquid carrying hole is ensured to be the same and uniform; since the liquid carrying roller C2 is matched with the perforating roller B2, the liquid carrying holes C2 are in one-to-one correspondence with the distribution of the perforating needles B2, which ensures the same coating amount of each coating area, further improves the coating uniformity, and the coating areas can be realized by designing different distributions of the liquid carrying holes C2 or the perforating needles B2, in the embodiment, the coating liquid d2 is colored hydrophilic ink, and different patterns can be formed by designing different distributions of the liquid carrying holes C2 or the perforating needles B2, so that the local colored coating patterns are given to the non-woven fabric, and the aesthetic feeling of the non-woven fabric is improved. Meanwhile, the concave roller A2 is also provided with a protrusion e2, and the needle roller B2 is provided with a recess f2 matched with the protrusion, so that the non-woven fabric can be simultaneously subjected to opening, embossing and coating on the side surface of the opening when passing through a local coating device, and when the formed local coating opening embossing non-woven fabric 22 is used for a surface layer of an absorbent product, the protrusion i2 can be quickly guided to the opening area of the non-woven fabric when body fluid arrives, so that the absorption of the body fluid is accelerated, the contact area with the skin can be reduced, the body fluid is prevented from seeping back, and the dryness and smoothness of the non-woven fabric are improved.

Example 3

As shown in fig. 3a, 3b and 3C, during coating, 1) the liquid-carrying roller C3 immersed in the coating liquid D3 transfers the coating liquid D3 in the liquid storage tank D3 to the liquid-carrying holes C3 of the liquid-carrying roller C3 during operation, and the scraper E3 positioned outside the liquid-carrying roller C3 removes the excess coating liquid D3, wherein: coating liquid d3 was a colorless hydrophilic oil agent, and the dipping depth of liquid-carrying roller C3 into coating liquid d3 was 5 mm; 2) liquid carrying roller C3 and needle roller B3 transfer coating liquid d3 from liquid carrying hole C3 to perforating needle B3 of needle roller B3 when liquid carrying hole C3 and perforating needle B3 are cooperated to rotate; 3) the method comprises the following steps of enabling a hot-air non-woven fabric 31 composed of 4-6 denier PE/PET fibers to enter a local coating device through a guide roller F3, enabling the hot-air non-woven fabric 31 to wrap a concave roller A3 and enter a space between a concave roller A3 and a needle roller B3, enabling another hydrophobic all-cotton spunlace non-woven fabric 33 to enter a gluing process H3 through a guide roller G3 and then enter a space between a concave roller A3 and a needle roller B3, overlapping and compounding with the hot-air non-woven fabric 31 wrapped on the concave roller A3, forming an opening H3 through piercing of a perforating needle B3, forming an embossing i3 through extrusion of a protrusion e3, and simultaneously enabling a coating liquid d3 on a perforating needle B3 to be coated on the inner side s3 of a non-woven fabric opening H3, so that the locally coated opening embossing composite non-woven fabric 32 is formed, wherein: the heating temperature of the concave roller a3 was 135 ℃, the heating temperature of the needle roller B3 was 120 ℃, the surface layer of the partially coated apertured embossed composite nonwoven fabric 32 was a hydrophobic all-cotton spunlace nonwoven fabric, the bottom layer was a hot air nonwoven fabric, and had apertures h3 and protrusions i3, and the coating liquid d2 was applied on the inner side s3 of the apertures h 3.

In this example, a hydrophobic all-cotton spunlace nonwoven fabric is laminated and combined with a high-denier through-air nonwoven fabric 31 by a partial coating apparatus to form an aperture or an embossment, while a hydrophilic finish on perforating needle b3 is coated on the inner side s3 of the aperture h3 of the nonwoven fabric, thereby forming a partially coated aperture-embossed composite nonwoven fabric 32, in which: the raised area of the surface layer hydrophobic all-cotton spunlace non-woven fabric is hydrophobic, and the inner side of the opening is hydrophilic, so that the raised area contacting with the skin is soft and skin-friendly, dry and damp-free when in use, body fluid can quickly permeate to the bottom layer in the opening area, and the fluffiness and the flow conductivity of the composite non-woven fabric can be improved by the high-denier hot air non-woven fabric 31 of the bottom layer, so that the dryness and the smoothness of the composite non-woven fabric are improved; meanwhile, the local coating device can carry out compounding, hole opening, embossing and coating synchronously, so that the process route is simplified, and the production cost is saved.

Example 4

As shown in fig. 4a, 4B and 4C, a partial coating device is composed of a concave roller a3, a needle roller B3, a liquid carrying roller C3, a doctor blade E3 and a liquid storage tank D3, and is connected with a pre-punching and embossing complex device which comprises a pair of first needle rollers J4 and a first concave roller I4 which are meshed with each other, wherein: the first needle roller J4 is provided with a perforating needle l4 and a recess m4, the first concave roller I4 is provided with a bulge k4 and a concave hole J4, and the first needle roller J4 is matched with the concave roller A4 of the local coating device.

During coating, 1) the liquid carrying roller C4 immersed in the coating liquid D4 transfers the coating liquid D4 in the liquid storage tank D4 to the liquid carrying hole C4 of the liquid carrying roller C4 during operation, and the scraper E4 positioned outside the liquid carrying roller C4 removes the redundant coating liquid D4, wherein: the coating liquid d4 is a colorless hydrophilic oil agent, and the depth of the liquid carrying roller C4 immersed in the coating liquid d4 is 8 mm; 2) liquid carrying roller C4 and needle roller B4 transfer coating liquid d4 from liquid carrying hole C4 to perforating needle B4 of needle roller B4 when liquid carrying hole C4 and perforating needle B4 are cooperated to rotate; 3) enabling a hot-air non-woven fabric 41 composed of 2.0 denier PE/PP water-repellent fibers to enter a first concave roller I4 and a first needle roller J4 in a pre-perforating embossing device through a guide roller F4, forming embossing on the surface of the non-woven fabric under the matched extrusion of a protrusion k4 and a recess m4, forming holes on the surface of the non-woven fabric under the matched piercing of a perforating needle l4 and a concave hole J4, and enabling the formed hole-perforated embossed non-woven fabric to tightly cover the hole-perforated embossed non-woven fabric on the first needle roller J4 under the piercing action of the perforating needle l4 so as to enter a part coating device; another hot-air non-woven fabric 43 composed of 4.0 denier PE/PET hydrophilic fibers enters a gluing process H4 through a guide roller G and then enters a concave roller A4 and a first needle roller J4 to be laminated and compounded with the open-pore embossed non-woven fabric coated on the first needle roller J4 to form an open pore H4, then enters a needle roller B4 and a concave roller A4 to be locally coated, and a coating liquid d4 on a perforating needle B4 is coated on the inner side s4 of the open pore H4 of the non-woven fabric, so that the locally coated open-pore embossed composite non-woven fabric 42 is formed, wherein: the heating temperature of the concave roller a4 was 130 ℃, the heating temperature of the needle roller B4 was 130 ℃, the surface layer of the partially coated apertured embossed composite nonwoven fabric 42 was a hydrophobic fine denier through-air nonwoven fabric, the bottom layer was a coarse denier through-air nonwoven fabric, and had apertures h4 and hollow protrusions i4, and the coating liquid d4 was applied on the inside s4 of the apertures h 4.

Since the locally coated and perforated embossed composite nonwoven fabric 42 has the protrusions i4 with the hydrophobic surface layer and the openings h4 only coated with the hydrophilic coating on the inner side s4, when the nonwoven fabric 42 is used as the surface layer of a sanitary towel or a diaper, when a consumer uses the nonwoven fabric 42, discharged body fluid contacts with the local surface in the middle of the nonwoven fabric 42, the body fluid is not easy to remain between the hydrophobic fibers of the surface layer due to the low surface tension of the hydrophobic fibers and is guided to the hydrophilic openings h4, so that the body fluid can be quickly guided to the absorption core layer and then quickly absorbed, and the protrusions i4 are hollow protrusions formed by compounding the nonwoven fabric 41 and the nonwoven fabric 42, so that the contact area between the surface of the nonwoven fabric and a human body can be effectively reduced, the body fluid can be prevented from seeping back, the skin is not adhered, the feeling of dryness is given, the protrusions can be prevented from being squeezed, and an air flow channel can be effectively formed between the nonwoven fabric 41 and the nonwoven fabric 42, the coating liquid d4 is transferred to the corresponding perforating needle b4 through the liquid carrying hole c4 on the liquid carrying roller, thus ensuring the same coating amount of each coating area and improving the uniformity of coating, and the coating areas can be realized by designing different liquid carrying holes or perforating needle distribution.

The above description is only a preferred embodiment of the present invention, and therefore should not be taken as limiting the scope of the invention, which is defined by the appended claims.