CN108130816B - Manufacturing process of parchment paper - Google Patents
Manufacturing process of parchment paper Download PDFInfo
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- CN108130816B CN108130816B CN201810011438.8A CN201810011438A CN108130816B CN 108130816 B CN108130816 B CN 108130816B CN 201810011438 A CN201810011438 A CN 201810011438A CN 108130816 B CN108130816 B CN 108130816B
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/06—Vegetable or imitation parchment; Glassine paper
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Abstract
The invention relates to a manufacturing process of parchment paper, which comprises the following specific steps of selecting proper leather, cleaning stains, carrying out primary lime water soaking, removing hair of zeolite, carrying out secondary lime water soaking, scraping grease, carrying out tertiary lime water soaking, cleaning and soaking with clear water, binding a rope, putting on a shelf, stretching, scraping grease and leveling blood vessels, drying in the shade, putting off the shelf, cutting and polishing. The parchment paper manufactured by the process has the advantages of good toughness, difficult damage, strong ink adhesion, long preservation time, water resistance, insect prevention and moth prevention. The manufacturing process does not use tanning agent, has small wastewater discharge and is environment-friendly.
Description
Technical Field
The invention relates to a manufacturing process of parchment paper.
Background
Parchment is an expensive and durable writing material, but most parchment on the market at present is not made of real parchment, but is made of imitation parchment prepared by a chemical method.
Chinese patent CN 106399602A describes a method for making sheepskin writing and painting paper, which comprises the steps of lime water soaking, stretching, unhairing, stretching, tanning, corrosion prevention, slurry soaking and colorant soaking. The tanning agent used in the tanning step in the manufacturing process contains harmful element chromium, so that the production cost is high, serious environmental pollution is caused, the leather wastewater treatment becomes a big problem of environmental protection, and leather enterprises also pay heavy cost for treating the leather wastewater.
Disclosure of Invention
The invention aims to provide an environment-friendly parchment paper manufacturing process which does not use tanning agent, has small wastewater discharge amount, and comprises the following specific steps:
(1) selecting skins: selecting skins without damage parts such as grass thorns, meat beans, wounds, scabs, knife edges, wormholes and the like;
(2) cleaning: soaking the selected peels in clear water for 6-24 hours, and cleaning the inner and outer sides of the peels by using high-pressure water, wherein particularly blood stains and colored stains need to be cleaned;
(3) first lime water soaking: soaking the cleaned skin with limewater for 2-8 days while stirring every 2-6 hr for 5 min, and stirring 5 times every day by turning over up and down;
(4) unhairing: removing hair of the skin soaked in lime water with zeolite, cleaning the tail and the corner, observing whether there is any damage such as grass thorn, meat bean, wound, wormhole, etc. after removing hair, and screening if there is any damage;
(5) and (3) soaking in lime water for the second time: soaking the dehaired peels with limewater for 2-8 days, and stirring once every 2-6 hours in a mode of turning over up and down;
(6) deoiling: cleaning a workbench, enabling a leather surface to face downwards, scraping grease completely by using a knife, and paying attention to the fact that scratches cannot be caused in the grease scraping process;
(7) and (3) lime water soaking for the third time: soaking the deoiled peels in limewater for 2-8 days, and stirring once every 2-6 hours in a mode of turning over up and down;
(8) soaking in clear water: cleaning with clear water, soaking in clear water for 2-8 days, stirring once every 2-6 hours, and stirring up and down;
(9) rope binding: uniformly binding ropes at a position 0.1-3cm away from the edge of the leather along the periphery of the leather, wherein the distance between every two adjacent ropes is 6-11 cm;
(10) putting on shelf: fixing the ropes of the four limbs of the leather, and then fixing the rest ropes, wherein the ropes of the four limbs are tightened along the extending direction of the four limbs, the rest ropes are tightened one by one according to a horizontal, flat and vertical distribution mode, and the tightening degree is increased from small to large until the whole ropes are tightened;
(11) fat scraping: scraping the flesh surface, namely vertically scraping the surface of the skin by a knife vertically and then transversely scraping the surface of the skin so as to scrape water stains on the surface of the skin; continuing scraping until all grease is scraped, and simultaneously scraping all blood vessels, and adjusting the tension degree of the rope while scraping; scraping the flesh side and then scraping the skin side, wherein the process is the same as the process of scraping the flesh side;
(12) drying in the shade: drying the leather fixed on the frame in the shade for 3 hours to 2 days indoors or in a cool place, keeping the rope in a tensioning state all the time, and checking the tightness of the rope at any time, wherein the rope needs to be tensioned in time if the rope is loosened;
(13) putting down: selecting any rope to start loosening, and loosening the rest ropes one by one from near to far according to the distance from the first loosened rope to gradually reduce the tension of the ropes until the skin is completely taken down;
(14) cutting: cutting off the hard edge along the inner side of the binding rope position;
(15) polishing: firstly, using sand paper with more than 600 meshes to carry out rough grinding, and then carrying out fine grinding on the leather surface of the parchment leftover materials.
The leather in the step (1) is selected from one of goat leather, sheep leather, cow leather and horse leather.
The peel in the step (1) is one of fresh peel, salt peel or frozen peel.
The concentration of the lime water in the step (3) is 1-10%.
In the step (3), the concentration of the lime water is adjusted according to the ambient temperature, and is 1-5% at 18-30 ℃; lower than 18 deg.c and 5-10 wt%.
The temperature of the lime water in the step (3) is 26-28 ℃.
In the step (5), the concentration of the lime water is 0.01-5%.
In the step (7), the concentration of the lime water is 0.01-1.5%.
In the step (11), the knife is a fan-shaped knife.
The invention has the advantages that: the technical fur is soaked in lime water for three times, and is matched with the processes of cleaning, unhairing, deoiling, scraping fat, stretching, polishing and the like, so that the intradermal sebaceous glands and fat cells of the fur are fully loosened, the degreasing effect is obvious, the difference of the leather surface of each part is effectively eliminated, the thickness of the final parchment is uniform, and the texture of the paper surface is uniform and has no difference. The parchment prepared by the process has the advantages of good toughness, difficult damage, long preservation time, water resistance, insect prevention, moth prevention, strong ink adhesion, no fading after printing and dyeing writing, capability of still keeping the original appearance of the bearing content after long-time preservation, no fishy smell when being used by people and increased experience feeling. Meanwhile, the parchment paper manufactured by the patent process does not damage the cuticle of the leather, keeps the toughness and luster of the skin and is more vivid when used for drawing figure portrait pictures. The manufacturing process does not use tanning agent, has small wastewater discharge and is environment-friendly.
Detailed Description
The following examples are presented to enable one of ordinary skill in the art to more fully understand the present invention and are not intended to limit the scope of the embodiments described herein.
Example 1
(1) Selecting skins: selecting fresh goat skin without damage parts such as grass thorn, meat beans, wounds, scabs, knife edges, wormholes and the like;
(2) cleaning: soaking the selected peels in clear water for 6 hours, and cleaning the inner and outer sides of the peels by using high-pressure water, wherein particularly blood stains and colored stains need to be cleaned;
(3) first lime water soaking: soaking the cleaned peels in lime water with the temperature of 26-28 ℃, wherein the concentration of the lime water is 3%, the peels are soaked for 6 days, and the peels are stirred once every 2 hours in the soaking process, each stirring time is 5 minutes, and the stirring is carried out in an up-and-down turning manner;
(4) unhairing: removing hair of the skin soaked in lime water with zeolite, cleaning the tail and the corner, observing whether there is any damage such as grass thorn, meat bean, wound, wormhole, etc. after removing hair, and screening if there is any damage;
(5) and (3) soaking in lime water for the second time: soaking the dehaired peels in lime water with the concentration of 3% for 6 days, stirring once every 2 hours, and stirring to turn over up and down;
(6) deoiling: cleaning a workbench, enabling a leather surface to face downwards, scraping grease completely by using a knife, and paying attention to the fact that scratches cannot be caused in the grease scraping process;
(7) and (3) lime water soaking for the third time: soaking the degreased peels in 1.5% lime water for 6 days, stirring once every 2 hours, and stirring to turn over up and down;
(8) soaking in clear water: cleaning with clear water, soaking in clear water for 6 days, stirring once every 2 hours, and stirring to turn over up and down;
(9) rope binding: uniformly binding ropes at a position 0.1-3cm away from the edge of the leather along the periphery of the leather, wherein the distance between every two adjacent ropes is 6-11 cm;
(10) putting on shelf: fixing the ropes of the four limbs of the leather, and then fixing the rest ropes, wherein the ropes of the four limbs are tightened along the extending direction of the four limbs, the rest ropes are tightened one by one according to a horizontal, flat and vertical distribution mode, and the tightening degree is increased from small to large until the whole ropes are tightened;
(11) fat scraping: scraping the flesh surface, namely vertically scraping the surface of the skin by a knife vertically and then transversely scraping the surface of the skin so as to scrape water stains on the surface of the skin; continuing scraping until all grease is scraped, and simultaneously scraping all blood vessels, and adjusting the tension degree of the rope while scraping; scraping the flesh side and then scraping the skin side, wherein the process is the same as the process of scraping the flesh side;
(12) drying in the shade: drying the leather fixed on the frame in the shade for 1 day indoors or in a shady place, checking the tightness of the rope at any time, and keeping the rope in a tensioned state all the time;
(13) putting down: selecting any rope to start loosening, and loosening the other ropes one by one from near to far according to the distance from the first loosened rope to gradually reduce the tension of the ropes until the skin is completely taken down;
(14) cutting: cutting off the hard edge along the inner side of the binding rope position;
(15) polishing: firstly, using 600-mesh sand paper to carry out rough grinding, and then carrying out fine grinding on the leather surface of the leather leftover material.
Example 2
(1) Selecting skins: selecting frozen sheep skin without grass thorn, meat bean, wound, scab, knife edge, wormhole and other damaged parts;
(2) cleaning: soaking the selected peels in clear water for 20 hours, and cleaning the inner and outer sides of the peels by using high-pressure water, wherein particularly blood stains and colored stains need to be cleaned;
(3) first lime water soaking: soaking the cleaned peels in lime water with the temperature of 26-28 ℃, wherein the concentration of the lime water is 1%, the soaking lasts for 2 days, the peels are stirred once every 3 hours in the soaking process, each stirring time lasts for 5 minutes, and the stirring is carried out in an up-and-down turning manner;
(4) unhairing: removing hair of the skin soaked in lime water with zeolite, cleaning the tail and the corner, observing whether there is any damage such as grass thorn, meat bean, wound, wormhole, etc. after removing hair, and screening if there is any damage;
(5) and (3) soaking in lime water for the second time: soaking the dehaired peels in lime water with the concentration of 2% for 3 days, stirring once every 3 hours, and stirring to turn over up and down;
(6) deoiling: cleaning a workbench, enabling a leather surface to face downwards, scraping grease completely by using a knife, and paying attention to the fact that scratches cannot be caused in the grease scraping process;
(7) and (3) lime water soaking for the third time: soaking the degreased peels in 1% lime water for 4 days, stirring once every 3 hours, and stirring to turn over up and down;
(8) soaking in clear water: cleaning with clear water, soaking in clear water for 3 days, stirring once every 3 hours, and stirring to turn over up and down;
(9) rope binding: uniformly binding ropes at a position 0.1-3cm away from the edge of the leather along the periphery of the leather, wherein the distance between every two adjacent ropes is 6-11 cm;
(10) putting on shelf: fixing the ropes of the four limbs of the leather, and then fixing the rest ropes, wherein the ropes of the four limbs are tightened along the extending direction of the four limbs, the rest ropes are tightened one by one according to a horizontal, flat and vertical distribution mode, and the tightening degree is increased from small to large until the whole ropes are tightened;
(11) fat scraping: scraping the flesh surface, namely vertically scraping the surface of the skin by a knife vertically and then transversely scraping the surface of the skin so as to scrape water stains on the surface of the skin; continuing scraping until all grease is scraped, and simultaneously scraping all blood vessels, and adjusting the tension degree of the rope while scraping; scraping the flesh side and then scraping the skin side, wherein the process is the same as the process of scraping the flesh side;
(12) drying in the shade: drying the leather fixed on the frame in the shade for 3 hours indoors or in a shady place, checking the tightness of the rope at any time, and keeping the rope in a tensioned state all the time;
(13) putting down: selecting any rope to start loosening, and loosening the other ropes one by one from near to far according to the distance from the first loosened rope to gradually reduce the tension of the ropes until the skin is completely taken down;
(14) cutting: cutting off the hard edge along the inner side of the binding rope position;
(15) polishing: firstly, carrying out coarse polishing by using 800-mesh sand paper, and then carrying out fine polishing on the leather surface of the leather leftover material.
Example 3
(1) Selecting skins: selecting the salt cowhide without damage parts such as grass thorn, meat bean, wound, scab, knife edge, wormhole and the like;
(2) cleaning: soaking the selected peels in clear water for 24 hours, and cleaning the inner and outer sides of the peels by using high-pressure water, wherein particularly blood stains and colored stains need to be cleaned;
(3) first lime water soaking: soaking the cleaned peels in lime water with the temperature of 26-28 ℃, wherein the concentration of the lime water is 10%, the peels are soaked for 8 days, and the peels are stirred once every 4 hours in the soaking process, each stirring time is 5 minutes, and the stirring is carried out in an up-and-down turning manner;
(4) unhairing: removing hair of the skin soaked in lime water with zeolite, cleaning the tail and the corner, observing whether there is any damage such as grass thorn, meat bean, wound, wormhole, etc. after removing hair, and screening if there is any damage;
(5) and (3) soaking in lime water for the second time: soaking the dehaired peels in 1% lime water for 8 days, stirring once every 6 hours, and stirring to turn over up and down;
(6) deoiling: cleaning a workbench, enabling a leather surface to face downwards, scraping grease completely by using a knife, and paying attention to the fact that scratches cannot be caused in the grease scraping process;
(7) and (3) lime water soaking for the third time: soaking the deoiled peels in lime water with the concentration of 0.5%, soaking for 8 days, stirring once every 6 hours, and stirring to turn over up and down;
(8) soaking in clear water: cleaning with clear water, soaking in clear water for 8 days, stirring once every 6 hours, and stirring to turn over up and down;
(9) rope binding: uniformly binding ropes at a position 0.1-3cm away from the edge of the leather along the periphery of the leather, wherein the distance between every two adjacent ropes is 6-11 cm;
(10) putting on shelf: fixing the ropes of the four limbs of the leather, and then fixing the rest ropes, wherein the ropes of the four limbs are tightened along the extending direction of the four limbs, the rest ropes are tightened one by one according to a horizontal, flat and vertical distribution mode, and the tightening degree is increased from small to large until the whole ropes are tightened;
(11) fat scraping: scraping the flesh surface, namely vertically scraping the surface of the skin by a knife vertically and then transversely scraping the surface of the skin so as to scrape water stains on the surface of the skin; continuing scraping until all grease is scraped, and simultaneously scraping all blood vessels, and adjusting the tension degree of the rope while scraping; scraping the flesh side and then scraping the skin side, wherein the process is the same as the process of scraping the flesh side;
(12) drying in the shade: drying the leather fixed on the frame in the shade for 2 days indoors or in a shady place, checking the tightness of the rope at any time, and keeping the rope in a tensioned state all the time;
(13) putting down: selecting any rope to start loosening, and loosening the other ropes one by one from near to far according to the distance from the first loosened rope to gradually reduce the tension of the ropes until the skin is completely taken down;
(14) cutting: cutting off the hard edge along the inner side of the binding rope position;
(15) polishing: firstly, using 1000-mesh sand paper to carry out rough grinding, and then carrying out fine grinding on the leather surface of the leather leftover material.
Comparative example
(1) Selecting skins: selecting fresh goat skin without damage parts such as grass thorn, meat beans, wounds, scabs, knife edges, wormholes and the like;
(2) cleaning: soaking the selected peels in clear water for 6 hours, and cleaning the inner and outer sides of the peels by using high-pressure water, wherein particularly blood stains and colored stains need to be cleaned;
(3) soaking in lime water: soaking the cleaned peels in lime water with the temperature of 26-28 ℃, wherein the concentration of the lime water is 3%, the peels are soaked for 6 days, and the peels are stirred once every 2 hours in the soaking process, each stirring time is 5 minutes, and the stirring is carried out in an up-and-down turning manner;
(4) unhairing: removing hair of the skin soaked in lime water with zeolite, cleaning the tail and the corner, observing whether there is any damage such as grass thorn, meat bean, wound, wormhole, etc. after removing hair, and screening if there is any damage;
(5) deoiling: cleaning a workbench, enabling a leather surface to face downwards, scraping grease completely by using a knife, and paying attention to the fact that scratches cannot be caused in the grease scraping process;
(6) soaking in clear water: cleaning with clear water, soaking in clear water for 6 days, stirring once every 2 hours, and stirring to turn over up and down;
(7) rope binding: uniformly binding ropes at a position 0.1-3cm away from the edge of the leather along the periphery of the leather, wherein the distance between every two adjacent ropes is 6-11 cm;
(8) putting on shelf: fixing the ropes of the four limbs of the leather, and then fixing the rest ropes, wherein the ropes of the four limbs are tightened along the extending direction of the four limbs, the rest ropes are tightened one by one according to a horizontal, flat and vertical distribution mode, and the tightening degree is increased from small to large until the whole ropes are tightened;
(9) fat scraping: scraping the flesh surface, namely vertically scraping the surface of the skin by a knife vertically and then transversely scraping the surface of the skin so as to scrape water stains on the surface of the skin; continuing scraping until all grease is scraped, and simultaneously scraping all blood vessels, and adjusting the tension degree of the rope while scraping; scraping the flesh side and then scraping the skin side, wherein the process is the same as the process of scraping the flesh side;
(10) drying in the shade: drying the leather fixed on the frame in the shade for 1 day indoors or in a shady place, checking the tightness of the rope at any time, and keeping the rope in a tensioned state all the time;
(11) putting down: selecting any rope to start loosening, and loosening the other ropes one by one from near to far according to the distance from the first loosened rope to gradually reduce the tension of the ropes until the skin is completely taken down;
(12) cutting: cutting off the hard edge along the inner side of the binding rope position;
(13) polishing: firstly, using 600-mesh sand paper to carry out rough grinding, and then carrying out fine grinding on the leather surface of the leather leftover material.
The parchment papers prepared in examples 1 to 3 and comparative example were evaluated and the evaluation results are shown in table 1.
TABLE 1 evaluation results of parchment papers prepared in examples 1 to 3 and comparative example
As can be seen from the evaluation results of the examples 1-3 and the comparative example, the process disclosed by the patent has the advantages that the intradermal sebaceous glands and fat cells of the skin are fully loosened, the degreasing effect is obvious, the difference of the skin surface of each part is effectively eliminated, the thickness of the final parchment paper is uniform, the texture of the paper surface is uniform and has no difference, the adhesive force of the ink is strong, and no fishy smell exists.
The foregoing has described the general principles and features of the present invention, as well as its advantages. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. A manufacturing process of parchment paper is characterized in that: the method comprises the following specific steps:
(1) selecting skins: selecting skins without damage to grass thorns, meat beans, wounds, scabs, knife edges and wormholes;
(2) cleaning: soaking the selected peels in clear water for 6-24 hours, and cleaning the inner and outer sides of the peels by using high-pressure water, wherein particularly blood stains and colored stains need to be cleaned;
(3) first lime water soaking: soaking the cleaned skin with limewater for 2-8 days while stirring every 2-6 hr for 5 min, and stirring 5 times every day by turning over up and down;
(4) unhairing: removing hair of the skin soaked in lime water with zeolite, cleaning the tail and the corner, observing whether grass thorns exist or not, and the damaged parts of the meat beans, the wounds and the wormholes again after hair removal, and screening out if the parts are damaged;
(5) and (3) soaking in lime water for the second time: soaking the dehaired peels with limewater for 2-8 days, and stirring once every 2-6 hours in a mode of turning over up and down;
(6) deoiling: cleaning a workbench, enabling a leather surface to face downwards, scraping grease completely by using a knife, and paying attention to the fact that scratches cannot be caused in the grease scraping process;
(7) and (3) lime water soaking for the third time: soaking the deoiled peels in limewater for 2-8 days, and stirring once every 2-6 hours in a mode of turning over up and down;
(8) soaking in clear water: cleaning with clear water, soaking in clear water for 2-8 days, stirring once every 2-6 hours, and stirring up and down;
(9) rope binding: uniformly binding ropes along the periphery of the leather, wherein the distance between every two adjacent ropes is 6-11 cm;
(10) putting on shelf: fixing the ropes of the four limbs of the leather, and then fixing the rest ropes, wherein the ropes of the four limbs are tightened along the extending direction of the four limbs, the rest ropes are tightened one by one according to a horizontal, flat and vertical distribution mode, and the tightening degree is increased from small to large until the whole ropes are tightened;
(11) fat scraping: scraping the flesh surface, namely vertically scraping the surface of the skin by a knife vertically and then transversely scraping the surface of the skin so as to scrape water stains on the surface of the skin; continuing scraping until all grease is scraped, and simultaneously scraping all blood vessels, and adjusting the tension degree of the rope while scraping; scraping the flesh side and then scraping the skin side, wherein the process is the same as the process of scraping the flesh side;
(12) drying in the shade: drying the leather fixed on the frame in the shade for 3 hours to 2 days indoors or in a cool place, keeping the rope in a tensioning state all the time, and checking the tightness of the rope at any time, wherein the rope needs to be tensioned in time if the rope is loosened;
(13) putting down: selecting any rope to start loosening, and loosening the rest ropes one by one from near to far according to the distance from the first loosened rope to gradually reduce the tension of the ropes until the skin is completely taken down;
(14) cutting: cutting off the hard edge along the inner side of the binding rope position;
(15) polishing: firstly, roughly polishing by using sand paper with more than 600 meshes, and then finely polishing the leather surface of the parchment leftover material;
in the step (3), the concentration of the lime water is adjusted according to the ambient temperature, and is 1-5% at 18-30 ℃; below 18 ℃ and 5-10 percent;
the temperature of the lime water in the step (3) is 26-28 ℃;
in the step (5), the concentration of the lime water is 0.01-5%;
in the step (7), the concentration of the lime water is 0.01-1.5%.
2. The parchment manufacturing process of claim 1, wherein in step (1) the parchment is selected from one of a group consisting of a goatskin, a sheep skin, a cowhide, and a horse skin.
3. The parchment paper making process of claim 1, wherein in step (1) the parchment is one of a fresh hide, a salt hide or a frozen hide.
4. A process for making parchment paper as claimed in claim 1, wherein said knife in step (11) is a fan knife.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810011438.8A CN108130816B (en) | 2018-01-05 | 2018-01-05 | Manufacturing process of parchment paper |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810011438.8A CN108130816B (en) | 2018-01-05 | 2018-01-05 | Manufacturing process of parchment paper |
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| Publication Number | Publication Date |
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| CN108130816A CN108130816A (en) | 2018-06-08 |
| CN108130816B true CN108130816B (en) | 2020-07-07 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4391601A (en) * | 1980-12-26 | 1983-07-05 | Herman Shmuel Y | Writing parchment and methods for the production thereof |
| CN102199675A (en) * | 2011-04-12 | 2011-09-28 | 王学川 | Clean process for producing leather by using sturgeon skin |
| CN106399602A (en) * | 2016-06-16 | 2017-02-15 | 赵程诚 | Manufacturing method of sheepskin writing and painting paper |
| CN107338336A (en) * | 2017-09-08 | 2017-11-10 | 汪孝凌 | A kind of processing technology of leather and fur products |
-
2018
- 2018-01-05 CN CN201810011438.8A patent/CN108130816B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4391601A (en) * | 1980-12-26 | 1983-07-05 | Herman Shmuel Y | Writing parchment and methods for the production thereof |
| CN102199675A (en) * | 2011-04-12 | 2011-09-28 | 王学川 | Clean process for producing leather by using sturgeon skin |
| CN106399602A (en) * | 2016-06-16 | 2017-02-15 | 赵程诚 | Manufacturing method of sheepskin writing and painting paper |
| CN107338336A (en) * | 2017-09-08 | 2017-11-10 | 汪孝凌 | A kind of processing technology of leather and fur products |
Non-Patent Citations (1)
| Title |
|---|
| 羊皮纸现代复制工艺;杨爽等;《皮革科学与工程》;20120831;第22卷(第4期);第16-17页第1节 * |
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| CN108130816A (en) | 2018-06-08 |
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