CN112842696A - Production method of adult paper diaper - Google Patents
Production method of adult paper diaper Download PDFInfo
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- CN112842696A CN112842696A CN202110215707.4A CN202110215707A CN112842696A CN 112842696 A CN112842696 A CN 112842696A CN 202110215707 A CN202110215707 A CN 202110215707A CN 112842696 A CN112842696 A CN 112842696A
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- cotton core
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- diaper
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 30
- 229920000742 Cotton Polymers 0.000 claims abstract description 71
- 239000003292 glue Substances 0.000 claims abstract description 35
- 239000012792 core layer Substances 0.000 claims abstract description 33
- 238000005507 spraying Methods 0.000 claims abstract description 25
- 239000011347 resin Substances 0.000 claims abstract description 23
- 229920005989 resin Polymers 0.000 claims abstract description 23
- 229920001131 Pulp (paper) Polymers 0.000 claims abstract description 19
- 239000000835 fiber Substances 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000002250 absorbent Substances 0.000 claims abstract description 17
- 238000000465 moulding Methods 0.000 claims abstract description 10
- 239000002052 molecular layer Substances 0.000 claims abstract description 8
- 238000005266 casting Methods 0.000 claims abstract description 6
- 239000011248 coating agent Substances 0.000 claims abstract description 4
- 238000000576 coating method Methods 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims abstract description 4
- 239000004744 fabric Substances 0.000 claims description 27
- 239000005871 repellent Substances 0.000 claims description 26
- 230000004888 barrier function Effects 0.000 claims description 25
- 239000010410 layer Substances 0.000 claims description 25
- 239000004745 nonwoven fabric Substances 0.000 claims description 23
- 239000002344 surface layer Substances 0.000 claims description 19
- 239000000853 adhesive Substances 0.000 claims description 18
- 230000001070 adhesive effect Effects 0.000 claims description 18
- 230000005660 hydrophilic surface Effects 0.000 claims description 15
- 239000011265 semifinished product Substances 0.000 claims description 6
- 239000000047 product Substances 0.000 claims description 5
- 229920000642 polymer Polymers 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 238000004677 spark ionization mass spectrometry Methods 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 abstract description 7
- 230000001427 coherent effect Effects 0.000 abstract description 3
- 230000002940 repellent Effects 0.000 description 8
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- 206010021639 Incontinence Diseases 0.000 description 2
- 229920002521 macromolecule Polymers 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 238000009827 uniform distribution Methods 0.000 description 2
- 239000011358 absorbing material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000028327 secretion Effects 0.000 description 1
- 210000002700 urine Anatomy 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/15577—Apparatus or processes for manufacturing
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
- A61F13/49—Absorbent articles specially adapted to be worn around the waist, e.g. diapers
- A61F13/496—Absorbent articles specially adapted to be worn around the waist, e.g. diapers in the form of pants or briefs
Landscapes
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Epidemiology (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Manufacturing & Machinery (AREA)
- Absorbent Articles And Supports Therefor (AREA)
Abstract
The invention discloses a production method of adult diapers, which comprises the following steps: crushing wood pulp fiber, mixing with high molecular water absorbing resin, and molding in mold wheel to form upper cotton core layer; uniformly stirring high-molecular water-absorbent resin, paving the high-molecular water-absorbent resin on the upper cotton core layer in the step one to form an intermediate high-molecular layer, crushing wood pulp fiber, uniformly mixing the wood pulp fiber with the high-molecular water-absorbent resin, and paving the mixture on the intermediate high-molecular layer to form a lower cotton core layer to obtain a cotton core; step two: conveying upper toilet paper and lower toilet paper, coating the upper surface and the lower surface of the cotton core in the step one, and then compacting the coated cotton core by using a net stick; step three: slitting the compacted cotton core in the second step; step four: and (4) spraying glue on the casting film for conveying, and adhering the casting film to the lower surface of the cotton core cut in the step three. The production process is coherent, the production efficiency is high, the manufactured adult paper diaper can effectively prevent side leakage, the water absorption capacity is high, and the adult paper diaper is dry and comfortable to use.
Description
Technical Field
The invention relates to the technical field of production of sanitary products, in particular to a production method of adult diapers.
Background
The adult diaper is one of disposable paper incontinence articles and adult care products, is mainly suitable for disposable diapers for incontinent adults, generally comprises a surface layer, an absorption layer and a bottom layer, and can absorb secretions of a user, so that the clothes are prevented from being stained, and the cleanness of the clothes is kept. However, the existing adult paper diaper on the market has the problems of independent production process, incoherent production link, low production efficiency, unstable structure, uneven distribution of water-absorbing materials and large urine volume of adults, so that the dryness and the smoothness of the adult paper diaper cannot be ensured. Therefore, there is a need for improvements in the prior art to avoid the disadvantages of the prior art.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the production method of the adult diaper with high production efficiency and stable production quality.
The invention is realized by the following technical scheme:
a method for producing adult paper diapers, which comprises the following steps,
the method comprises the following steps: crushing wood pulp fiber, mixing with high molecular water absorbing resin, and molding in mold wheel to form upper cotton core layer; uniformly stirring high-molecular water-absorbent resin, paving the high-molecular water-absorbent resin on the upper cotton core layer in the step one to form an intermediate high-molecular layer, crushing wood pulp fiber, uniformly mixing the wood pulp fiber with the high-molecular water-absorbent resin, and paving the mixture on the intermediate high-molecular layer to form a lower cotton core layer to obtain a cotton core;
step two: conveying upper toilet paper and lower toilet paper, coating the upper surface and the lower surface of the cotton core in the step one, and then compacting the coated cotton core by using a net stick;
step three: slitting the compacted cotton core in the second step;
step four: spraying glue on the cast film for conveying, and adhering the cast film to the lower surface of the cotton core cut in the third step;
step five: spraying glue on the hydrophilic surface layer non-woven fabric for conveying, and sticking the hydrophilic surface layer non-woven fabric to the upper surface of the cotton core in the fourth step;
step six: spraying glue on the three-dimensional enclosure water-repellent barrier cloth for conveying, and sticking the three-dimensional enclosure water-repellent barrier cloth to the surface of the hydrophilic surface layer non-woven fabric in the step five;
step seven: spraying glue for conveying the front waist patch, and sticking the front waist patch to the surface of the casting film in the sixth step;
step eight: sticking the three-dimensional rubber band to the top side of the water-repellent barrier cloth of the three-dimensional enclosure in the step seven by using rubber band glue, and sticking the leg rubber band to the bottom side of the water-repellent barrier cloth of the three-dimensional enclosure in the step seven by using rubber band glue;
step nine: carrying out composite molding to obtain a paper diaper blank;
step ten: c, pasting a front waist sticker at the front waist position of the bottom surface of the paper diaper blank in the ninth step, and pasting adhesive strips on the left side and the right side of the rear waist position of the top surface of the paper diaper blank in the ninth step respectively;
step eleven: molding and externally cutting the paper diaper blank in the step ten to obtain a semi-finished product;
step twelve: and seventhly, performing three-folding on the semi-finished product in the step eleven to form a three-folding packaging structure, and obtaining a finished product.
Further, the upper cotton core layer in the first step comprises, by mass, 45% -55% of high-molecular water-absorbent resin, 42% -49% of wood pulp fiber and 2% -7% of structural adhesive.
Further, the lower cotton core layer in the first step comprises, by mass, 55% -65% of high-molecular water-absorbing resin, 30% -40% of wood pulp fiber and 2% -7% of structural adhesive.
Further, the thickness of the upper cotton core layer in the first step is 45% -65% of the thickness of the cotton core, the thickness of the middle polymer layer in the first step is 10% -25% of the thickness of the cotton core, and the thickness of the lower cotton core layer in the first step is 25% -35% of the thickness of the cotton core.
Further, the casting film in the fourth step comprises a bottom liner paper layer and a breathable bottom film layer which are bonded from top to bottom through structural adhesive.
Further, the breathable bottom film layer is a PE breathable bottom film layer.
Further, the hydrophilic surface layer non-woven fabric in the fifth step comprises an imitated sticky non-woven fabric surface layer and an imitated sticky non-woven fabric flow guide layer which are bonded from top to bottom through structural adhesive.
Further, the three-dimensional enclosure water-repellent barrier cloth in the sixth step is SSMS non-woven fabric.
Further, the height of the water-repellent barrier cloth for the three-dimensional enclosure in the sixth step is 35 mm.
Compared with the prior art, the invention prepares the upper cotton core layer through the die wheel forming, the middle macromolecule layer and the lower cotton core layer are sequentially paved on the upper cotton core layer to prepare the cotton core, the cast film glue spraying conveying, the hydrophilic surface layer non-woven fabric glue spraying conveying, the three-dimensional enclosure water repellent barrier cloth glue spraying conveying, the front waist glue spraying conveying, the three-dimensional enclosure water repellent barrier cloth glue spraying conveying and the front waist glue spraying conveying are connected, the production process and the production link of the adult paper diaper are coherent, the production efficiency is high, the produced adult paper diaper has stable structure and uniform distribution of water absorption materials, the dryness and the smoothness of the adult paper diaper are ensured, the three-dimensional rubber band is pasted on the top side of the three-dimensional enclosure water repellent barrier cloth by the rubber band glue, the leg rubber band is pasted on the bottom side of the three-dimensional enclosure water repellent barrier cloth by the rubber band glue, the manufactured adult paper diaper has stable structure and is not easy to deform, the side leakage can, the use comfort of the user is improved, bacteria are not easy to breed, and the use is safe.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A method for producing adult paper diapers, which comprises the following steps,
the method comprises the following steps: crushing wood pulp fiber, mixing with high molecular water absorbing resin, and molding in mold wheel to form upper cotton core layer; uniformly stirring high-molecular water-absorbent resin, paving the high-molecular water-absorbent resin on the upper cotton core layer in the step one to form an intermediate high-molecular layer, crushing wood pulp fiber, uniformly mixing the wood pulp fiber with the high-molecular water-absorbent resin, and paving the mixture on the intermediate high-molecular layer to form a lower cotton core layer to obtain a cotton core;
step two: conveying upper toilet paper and lower toilet paper, coating the upper surface and the lower surface of the cotton core in the step one, and then compacting the coated cotton core by using a net stick;
step three: slitting the compacted cotton core in the second step;
step four: spraying glue on the cast film for conveying, and adhering the cast film to the lower surface of the cotton core cut in the third step;
step five: spraying glue on the hydrophilic surface layer non-woven fabric for conveying, and sticking the hydrophilic surface layer non-woven fabric to the upper surface of the cotton core in the fourth step;
step six: spraying glue on the three-dimensional enclosure water-repellent barrier cloth for conveying, and sticking the three-dimensional enclosure water-repellent barrier cloth to the surface of the hydrophilic surface layer non-woven fabric in the step five;
step seven: spraying glue for conveying the front waist patch, and sticking the front waist patch to the surface of the casting film in the sixth step;
step eight: sticking the three-dimensional rubber band to the top side of the water-repellent barrier cloth of the three-dimensional enclosure in the step seven by using rubber band glue, and sticking the leg rubber band to the bottom side of the water-repellent barrier cloth of the three-dimensional enclosure in the step seven by using rubber band glue;
step nine: carrying out composite molding to obtain a paper diaper blank;
step ten: c, pasting a front waist sticker at the front waist position of the bottom surface of the paper diaper blank in the ninth step, and pasting adhesive strips on the left side and the right side of the rear waist position of the top surface of the paper diaper blank in the ninth step respectively;
step eleven: molding and externally cutting the paper diaper blank in the step ten to obtain a semi-finished product;
step twelve: seventhly, the semi-finished product in the step eleven is subjected to three-folding to form a three-folding packaging structure, and a finished product is manufactured
The upper cotton core layer in the first step comprises 45% -55% of high-molecular water-absorbent resin, 42-49% of wood pulp fiber and 2% -7% of structural adhesive in percentage by mass, the corrosion resistance and the flexibility of the adult diaper are improved while the water absorption rate is ensured, and as a specific implementation mode, the upper cotton core layer in the first step comprises 52% of high-molecular water-absorbent resin, 44% of wood pulp fiber and 4% of structural adhesive in percentage by mass.
The lower cotton core layer in the first step comprises 55-65% of high-molecular water-absorbent resin, 30-40% of wood pulp fiber and 2-7% of structural adhesive in percentage by mass, the water absorption rate is improved, and meanwhile the corrosion resistance and the flexibility of the adult paper diaper are guaranteed.
The thickness of the upper cotton core layer in the step one is 45% -65% of the thickness of the cotton core, the thickness of the middle high polymer layer in the step one is 10% -25% of the thickness of the cotton core, the thickness of the lower cotton core layer in the step one is 25% -35% of the thickness of the cotton core, the structure of the cotton core is stable, the water absorption rate can be effectively improved, meanwhile, the corrosion resistance and the flexibility of the adult diaper are improved, as a specific implementation mode, the thickness of the upper cotton core layer in the step one is 56% of the thickness of the cotton core, the thickness of the middle high polymer layer in the step one is 16% of the thickness of the cotton core, and the thickness of the lower cotton core layer in the step one is 28% of the thickness of the cotton core.
The cast film in the fourth step comprises the bottom layer liner paper layer and the breathable bottom film layer which are bonded from top to bottom through the structural adhesive, so that the cast film is good in waterproofness, good in breathability, soft and skin-friendly and good in hand feeling.
The breathable bottom film layer is the PE breathable bottom film layer, the PE breathable bottom film is good in breathability, can permeate gas and cannot permeate water, not only can effectively isolate moisture, but also can discharge hot gas and moisture, has good moisture resistance, is soft and close to skin, is good in hand feeling, and is comfortable to use.
The hydrophilic surface layer non-woven fabric in the step five comprises an imitated sticky non-woven fabric surface layer and an imitated sticky non-woven fabric flow guide layer which are bonded from top to bottom through structural adhesive, so that the hydrophilic surface layer non-woven fabric is good in air permeability, high in dryness and comfortable in contact with skin.
And the three-dimensional enclosure water-repellent barrier cloth in the sixth step is an SSMS non-woven fabric which is good in uniformity, has a good waterproof and breathable effect, is tensile and tear-resistant, and is good in using effect.
The height of the three-dimensional enclosure water-repellent cloth in the sixth step is 35mm, the side leakage prevention effect is good, and the use comfort level is high.
Compared with the prior art, the invention prepares the upper cotton core layer through the die wheel forming, the middle macromolecule layer and the lower cotton core layer are sequentially paved on the upper cotton core layer to prepare the cotton core, the cast film glue spraying conveying, the hydrophilic surface layer non-woven fabric glue spraying conveying, the three-dimensional enclosure water repellent barrier cloth glue spraying conveying, the front waist glue spraying conveying, the three-dimensional enclosure water repellent barrier cloth glue spraying conveying and the front waist glue spraying conveying are connected, the production process and the production link of the adult paper diaper are coherent, the production efficiency is high, the produced adult paper diaper has stable structure and uniform distribution of water absorption materials, the dryness and the smoothness of the adult paper diaper are ensured, the three-dimensional rubber band is pasted on the top side of the three-dimensional enclosure water repellent barrier cloth by the rubber band glue, the leg rubber band is pasted on the bottom side of the three-dimensional enclosure water repellent barrier cloth by the rubber band glue, the manufactured adult paper diaper has stable structure and is not easy to deform, the side leakage can, the use comfort of the user is improved, bacteria are not easy to breed, and the use is safe.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. The production method of the adult paper diaper is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
the method comprises the following steps: crushing wood pulp fiber, mixing with high molecular water absorbing resin, and molding in mold wheel to form upper cotton core layer; uniformly stirring high-molecular water-absorbent resin, paving the high-molecular water-absorbent resin on the upper cotton core layer in the step one to form an intermediate high-molecular layer, crushing wood pulp fiber, uniformly mixing the wood pulp fiber with the high-molecular water-absorbent resin, and paving the mixture on the intermediate high-molecular layer to form a lower cotton core layer to obtain a cotton core;
step two: conveying upper toilet paper and lower toilet paper, coating the upper surface and the lower surface of the cotton core in the step one, and then compacting the coated cotton core by using a net stick;
step three: slitting the compacted cotton core in the second step;
step four: spraying glue on the cast film for conveying, and adhering the cast film to the lower surface of the cotton core cut in the third step;
step five: spraying glue on the hydrophilic surface layer non-woven fabric for conveying, and sticking the hydrophilic surface layer non-woven fabric to the upper surface of the cotton core in the fourth step;
step six: spraying glue on the three-dimensional enclosure water-repellent barrier cloth for conveying, and sticking the three-dimensional enclosure water-repellent barrier cloth to the surface of the hydrophilic surface layer non-woven fabric in the step five;
step seven: spraying glue for conveying the front waist patch, and sticking the front waist patch to the surface of the casting film in the sixth step;
step eight: sticking the three-dimensional rubber band to the top side of the water-repellent barrier cloth of the three-dimensional enclosure in the step seven by using rubber band glue, and sticking the leg rubber band to the bottom side of the water-repellent barrier cloth of the three-dimensional enclosure in the step seven by using rubber band glue;
step nine: carrying out composite molding to obtain a paper diaper blank;
step ten: c, pasting a front waist sticker at the front waist position of the bottom surface of the paper diaper blank in the ninth step, and pasting adhesive strips on the left side and the right side of the rear waist position of the top surface of the paper diaper blank in the ninth step respectively;
step eleven: molding and externally cutting the paper diaper blank in the step ten to obtain a semi-finished product;
step twelve: and seventhly, performing three-folding on the semi-finished product in the step eleven to form a three-folding packaging structure, and obtaining a finished product.
2. The method for producing a diaper for adults as claimed in claim 1, wherein: the upper cotton core layer in the first step comprises, by mass, 45% -55% of high-molecular water-absorbent resin, 42% -49% of wood pulp fiber and 2% -7% of structural adhesive.
3. The method for producing a diaper for adults as claimed in claim 1, wherein: the lower cotton core layer in the first step comprises, by mass, 55% -65% of high-molecular water-absorbing resin, 30% -40% of wood pulp fiber and 2% -7% of structural adhesive.
4. The method for producing a diaper for adults as claimed in claim 1, wherein: the thickness of the upper cotton core layer in the step one is 45% -65% of the thickness of the cotton core, the thickness of the middle polymer layer in the step one is 10% -25% of the thickness of the cotton core, and the thickness of the lower cotton core layer in the step one is 25% -35% of the thickness of the cotton core.
5. The method for producing a diaper for adults as claimed in claim 1, wherein: and the cast film in the fourth step comprises a bottom layer liner paper layer and a breathable bottom film layer which are bonded from top to bottom through structural adhesive.
6. The method for producing a diaper for adults as claimed in claim 5, wherein: the breathable bottom film layer is a PE breathable bottom film layer.
7. The method for producing a diaper for adults as claimed in claim 1, wherein: and the hydrophilic surface layer non-woven fabric in the fifth step comprises an imitated adhesive non-woven fabric surface layer and an imitated adhesive non-woven fabric flow guide layer which are bonded from top to bottom through structural adhesive.
8. The method for producing a diaper for adults as claimed in claim 1, wherein: and the three-dimensional enclosure water-repellent barrier cloth in the sixth step is SSMS non-woven cloth.
9. The method for producing a diaper for adults as claimed in claim 1, wherein: and in the sixth step, the height of the three-dimensional enclosure water-repellent barrier cloth is 35 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110215707.4A CN112842696A (en) | 2021-02-26 | 2021-02-26 | Production method of adult paper diaper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110215707.4A CN112842696A (en) | 2021-02-26 | 2021-02-26 | Production method of adult paper diaper |
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| CN112842696A true CN112842696A (en) | 2021-05-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110215707.4A Pending CN112842696A (en) | 2021-02-26 | 2021-02-26 | Production method of adult paper diaper |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113893093A (en) * | 2021-10-21 | 2022-01-07 | 川田卫生用品(浙江)有限公司 | Sanitary panties and its making method |
| CN113925686A (en) * | 2021-08-24 | 2022-01-14 | 余少椿 | Comprehensive leakage-proof paper diaper and pull-up diaper and preparation process thereof |
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Application publication date: 20210528 |