CN103233325A - Collagen fiber regenerated bark and manufacturing method thereof - Google Patents
Collagen fiber regenerated bark and manufacturing method thereof Download PDFInfo
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- CN103233325A CN103233325A CN201310119337XA CN201310119337A CN103233325A CN 103233325 A CN103233325 A CN 103233325A CN 201310119337X A CN201310119337X A CN 201310119337XA CN 201310119337 A CN201310119337 A CN 201310119337A CN 103233325 A CN103233325 A CN 103233325A
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Abstract
The invention relates to a collagen fiber regenerated bark which is characterized in that the fibre web of the collagen fiber regenerated bark comprises the following materials by weight: 85 to 99 percent of collagen fiber, and 1 to 15 percent of hot melting bonding fibre; both the transversal and the longitudinal tearing strength of the regenerated bark are more than 23 N; both the transversal and the longitudinal tensile strength of the regenerated bark are more than 68 N; the hand feeling is close to dermis; and the collagen fiber regenerated bark can be used for making advanced handbags and board-type sofa material. The invention further relates to a method for manufacturing the regenerated bark, which comprises the following steps in sequence: dissolving fiber, opening, mix-opening, lapping, stabbing, cutting edge, rolling, packaging and the like. Through the adoption of the stabbing process in the method, single hot melting bonding fibre is enabled to form more winding structures with collagen fiber before being heated to bond collagen fiber; and with the help of heat treatment, the collagen fiber regenerated bark has the advantages that the winding structure in the fibre web is fixed; and the web structure compactness in the fibre web is improved, thereby remarkably improving the strength of the regenerated bark.
Description
Technical field
The present invention relates to nonwoven material and manufacture method thereof, be specifically related to a kind of regenerated collagen fiber skin and manufacture method thereof.
Background technology
The tailing quantity of natural corium is very big, if can carry out the secondary utilization to it, and particularly secondary operations becomes regenerated bark, can produce sizable wealth, simultaneously energy-saving and environment friendly is produced positive meaning.At present, utilize the method that the tailing of natural corium is processed into regenerated bark to comprise: fragment Method for bonding, fiber Method for bonding and the solid method of fiber thorn.
Wherein, the fragment Method for bonding refers to earlier corium to be processed into corium fine grained chippings bonding cutification again; Through the regenerated bark that this method obtains, its feel and intensity are all far away from natural corium.The solid method of fiber Method for bonding and fiber thorn respectively has pluses and minuses: the fiber Method for bonding refers to that earlier corium being processed into collagenous fibres recycling hot-melt adhesive fiber is glued together collagenous fibres, forms regenerated bark, the fibre strength height that obtains through this method but feel is poor; The solid method of fiber thorn refers to earlier corium is processed into collagenous fibres and then lapping, the solid cutification of thorn, and is inferior slightly through the fibre strength that this method obtains, but feel is near corium.
For avoiding reducing the feel of regenerated bark, in the described fiber Method for bonding of patent CN102115955B, the fibre web that specially is provided with bottom and top layer has high collagen contents (97% percetage by weight, 3% PLA bicomponent fiber), and the intermediate layer fibre web adopts 100% PLA bicomponent fiber, utilize the hot melt adhesive of a spot of PLA bicomponent fiber in PLA bicomponent fiber in the fibre web of intermediate layer and bottom and the top layer fibre web that collagenous fibres are glued together, avoided the regenerated bark surface to make the feel variation because containing too much hot-melt adhesive fiber simultaneously.The lapping but this method need separately be prepared burden, cumbersome on the technology, simultaneously in the method, only rely on hot-melt adhesive fiber adhesive glue fibrillation, lack effectively between hot-melt adhesive fiber and the collagenous fibres and tangle, hot-melt adhesive fiber also only plays the effect of similar thermal fusing powder, makes the mechanical strength of regenerated bark be difficult to be improved fully.
At the shortcoming of existing fiber Method for bonding, therefore, be necessary to develop a kind of regenerated collagen fiber skin and a kind of process for the manufacture of this regenerated collagen fiber skin with high strength and excellent handle.
Summary of the invention
The technical issues that need to address of the present invention are to provide a kind of regenerated collagen fiber skin with high strength and excellent handle.
Simultaneously, the technical issues that need to address of the present invention also are to provide a kind of simple process method for the manufacture of this regenerated collagen fiber skin.
The technical issues that need to address of the present invention are achieved through the following technical solutions:
A kind of regenerated collagen fiber skin, its Web materials is formed and percentage by weight is: collagenous fibres 85～99%, hot-melt adhesive fiber 1～15%; All more than 23N, horizontal and vertical TENSILE STRENGTH is all more than 68N for the horizontal and vertical tearing toughness of this regenerated bark.Preferably, the percetage by weight of hot-melt adhesive fiber is 5～8% in the fibre web; Collagenous fibres length is 1～3cm.
A kind of method of making above-mentioned regenerated collagen fiber skin, it may further comprise the steps successively:
(1) separates fibre: corium is separated fibre, form collagenous fibres;
(2) shredding: collagenous fibres and hot-melt adhesive fiber are used the opener shredding respectively;
(3) mix shredding: collagenous fibres and hot-melt adhesive fiber are mixed after the dosing machine metering, form blended fiber, then with blended fiber with opener mixing shredding;
(4) lapping: blended fiber is paved into fibre web equably;
(5) thorn is solid: the fibre web of completing is carried out positive and negative thorn handle admittedly, form base cloth;
(6) heat treatment: the solid back of thorn base cloth makes the hot-melt adhesive fiber bond vitrified live collagenous fibres through heat treatment, cooling subsequently;
(7) side cut, rolling, packing: after the part that the gained base cloth is irregular, unnecessary trims, rolling, packing.
Preferably, in above-mentioned manufacture method, corium is the corner blanking of pig, sheep, ox-hide process hides processing in the step (1).
Preferably, in above-mentioned manufacture method, collagenous fibres and hot-melt adhesive fiber mix by 92～95%:5～8% weight proportion in the step (3).
Preferably, in above-mentioned manufacture method, step (4) comprises successively:
(4-1) combing lapping: with blended fiber with the combing of combing lapping machine after, with combing lapping machine through the staggered lapping of broadwise, form grammes per square metre 100～200 grams/square metre fibre web;
(4-2) air-laid: adopt the air-laid machine with the lapping of blended fiber stereo staggered, form grammes per square metre 250～1000 grams/square metre fibre web.
Preferably, in above-mentioned manufacture method, utilize special needing machine to carry out solid processing of positive and negative acupuncture thorn the fibre web of completing in the step (5), form base cloth.
Preferably, in above-mentioned manufacture method, the thorn thorn is solid to be handled in the step (5) fibre web of completing to be utilized High-Pressure Water more than the 200MPa just turning one's coat, and press dry moisture then, forms moisture and be 10～55% base cloth.
Preferably, in above-mentioned manufacture method, heat treatment is a kind of or its any combination during hot water, hot blast and hot rolling are handled in the step (6).
Further preferably, in above-mentioned manufacture method, earlier moisture is no more than 55% base cloth in the step (6) and immersed in 40～100 ℃ of hot water 5～15 minutes, press dry moisture then, pressing dry the back moisture is 10～55%, then cures 6～12 minutes in 40～100 ℃ of hot blasts.
Still more preferably, in above-mentioned manufacture method, in the step (6), when hot blast cured, earlier preliminary drying 3～8 minutes in 40～60 ℃ of hot blasts was dried 3～6 minutes in 80～100 ℃ of hot blasts again.
Compared with prior art, the present invention has the following advantages:
1. a kind of regenerated collagen fiber skin of the present invention and manufacture method thereof, in the method, the solid processing of thorn makes single hot-melt adhesive fiber can form more winding arrangement with collagenous fibres before the bound collagen fiber that is heated, relend and help heat treatment, winding arrangement in the fibre web is fixed, improve cancellated compactness in the fibre web, thereby significantly improved the intensity of regenerated bark.
2. a kind of regenerated collagen fiber skin of the present invention and manufacture method thereof, in the method, the shredding separately earlier of collagenous fibres and hot-melt adhesive fiber, mix shredding again, two kinds of fibers are evenly distributed in the feasible fibre web that is paved into, avoid regenerated bark intensity inequality, thereby improved the performances such as intensity of regenerated bark on the whole.
3. a kind of regenerated collagen fiber skin of the present invention and manufacture method thereof in the method, also can adopt traditional water jet process to finish the solid processing of base cloth thorn; When heat treatment, directly in hot water, make earlier the hot melting cohesion fiber to a certain degree softening, and then heating is cured step by step, avoid collagenous fibres to make intensity generation deterioration because at high temperature crossing long-time the stop.
4. a kind of regenerated collagen fiber skin of the present invention and manufacture method thereof in the method, by mix a spot of hot-melt adhesive fiber in Web materials, make when regenerated bark intensity improves, and also do not influence the feel on regenerated bark surface; Especially on the mixed weight during 5～8% hot-melt adhesive fiber, regenerated bark has reached good balance between intensity and feel.
This regenerated collagen fiber skin tearing toughness and TENSILE STRENGTH height, the feel on surface can be used to make senior handbag and template sofa material etc. near corium.
The specific embodiment
Below in conjunction with embodiment, the specific embodiment of the present invention is described further.Following examples only are used for technical scheme of the present invention more clearly is described, and can not limit protection scope of the present invention with this.
At first, the evaluation method that following each embodiment is adopted is carried out general description.
Tensile properties: based on the stretching test method of JIS-L1096-1964 fabric, measure tensile break strength.Wherein, serve as vertically with the direct of travel of fabric treating that tangles not, the direction vertical with the direct of travel of the fabric treating not of tangling measured at transverse and longitudinal respectively for laterally.In addition, condition determination is for to carry out under the environmental condition of 23 ℃ of temperature, humidity 65%.
Tear characteristics: based on the stretching test method of JIS-L1096-1964 fabric, measured tearing strength.Wherein, be determined in length and breadth and carry out respectively on the direction.In addition, condition determination is for to carry out under the environmental condition of 23 ℃ of temperature, humidity 65%.
Embodiment 1
This law is bright to relate to a kind of regenerated collagen fiber skin, and the Web materials of this regenerated bark is formed and percentage by weight is: collagenous fibres 92%, hot-melt adhesive fiber 8%.Wherein, collagenous fibres length is 1～3cm.The thickness of this regenerated bark is 0.5～3mm, and all more than 23N, horizontal and vertical TENSILE STRENGTH is all more than 68N for horizontal and vertical tearing toughness.Wherein, be example with the performance of 1mm thickness regenerated bark, its result is presented in the table 1.
The invention still further relates to a kind of method of making above-mentioned regenerated collagen fiber skin, it may further comprise the steps successively:
(1) separate fibre: pig, sheep, ox-hide corium are separated fibre, form collagenous fibres, wherein pig, sheep, ox-hide corium are the corner blanking of process hides processing.
(2) shredding: collagenous fibres and hot-melt adhesive fiber are used the opener shredding respectively.
(3) mix shredding: collagenous fibres and hot-melt adhesive fiber are mixed by the 92%:8% weight proportion through dosing machine metering back, the formation blended fiber, then with blended fiber with opener mixing shredding.
(4) lapping:
(4-1) combing lapping: with blended fiber with the combing of combing lapping machine after, with combing lapping machine through the staggered lapping of broadwise, be paved into equably grammes per square metre 100～200 grams/square metre fibre web;
(4-2) air-laid: adopt the air-laid machine with the lapping of blended fiber stereo staggered, be paved into equably grammes per square metre 250～1000 grams/square metre fibre web.
(5) thorn is solid: utilize special needing machine to carry out positive and negative thorn the fibre web of completing and handle admittedly, form base cloth.
(6) heat treatment: the solid relief base cloth of thorn carries out hot rolling by a pair roller makes the hot-melt adhesive fiber bond vitrified live collagenous fibres, 80～100 ℃ of roller temperatures, 1.5～2 meters/minute of speed, pressure 3.5～4.5Pa, cooling subsequently.
(7) side cut, rolling, packing: after the part that the gained base cloth is irregular, unnecessary trims, rolling, packing.
Embodiment 2
This law is bright to relate to a kind of regenerated collagen fiber skin, and the Web materials of this regenerated bark is formed and percentage by weight is: collagenous fibres 95%, hot-melt adhesive fiber 5%.Wherein, collagenous fibres length is 1～3cm.The thickness of this regenerated bark is 0.5～3mm, and all more than 23N, horizontal and vertical TENSILE STRENGTH is all more than 68N for horizontal and vertical tearing toughness.Wherein, be example with the performance of 1mm thickness regenerated bark, its result is presented in the table 1.
The invention still further relates to a kind of method of making above-mentioned regenerated collagen fiber skin, it may further comprise the steps successively:
(1) separate fibre: pig, sheep, ox-hide corium are separated fibre, form collagenous fibres, wherein pig, sheep, ox-hide corium are the corner blanking of process hides processing.
(2) shredding: collagenous fibres and hot-melt adhesive fiber are used the opener shredding respectively.
(3) mix shredding: collagenous fibres and hot-melt adhesive fiber are mixed by the 95%:5% weight proportion through dosing machine metering back, the formation blended fiber, then with blended fiber with opener mixing shredding.
(4) lapping:
(4-1) combing lapping: with blended fiber with the combing of combing lapping machine after, with combing lapping machine through the staggered lapping of broadwise, be paved into equably grammes per square metre 100～200 grams/square metre fibre web;
(4-2) air-laid: adopt the air-laid machine with the lapping of blended fiber stereo staggered, be paved into equably grammes per square metre 250～1000 grams/square metre fibre web.
(5) thorn is solid: the fibre web elder generation process of completing is prewetted, the pressure of prewetting is 2～6MPa, the time of prewetting is 2～5 seconds, then sting in advance again, pre-thorn pressure is 30～80MPa, and the thorn time is 1～3 second in advance, and the High-Pressure Water with 200～300MPa carries out positive and negative thorn admittedly then, press dry moisture at last, the formation moisture is 55～60% base cloth.
(6) heat treatment: earlier base cloth was immersed in 40～100 ℃ of hot water 5～15 minutes, press dry moisture then, pressing dry the back moisture is 55～60%, then preliminary drying 3～8 minutes in 40～60 ℃ of hot blasts, in 80～100 ℃ of hot blasts, dried 3～6 minutes again, the total time that stops in hot blast is 6～12 minutes, subsequently cooling.
(7) side cut, rolling, packing: after the part that the gained base cloth is irregular, unnecessary trims, rolling, packing.
Embodiment 3
This law is bright to relate to a kind of regenerated collagen fiber skin, and the Web materials of this regenerated bark is formed and percentage by weight is: collagenous fibres 99%, hot-melt adhesive fiber 1%.Wherein, collagenous fibres length is 1～3cm.The thickness of this regenerated bark is 0.5～3mm, and all more than 23N, horizontal and vertical TENSILE STRENGTH is all more than 68N for horizontal and vertical tearing toughness.Wherein, be example with the performance of 1mm thickness regenerated bark, its result is presented in the table 1.
The invention still further relates to a kind of method of making above-mentioned regenerated collagen fiber skin, it may further comprise the steps successively: (1) separates fine: pig, sheep, ox-hide corium are separated fibre, form collagenous fibres, wherein pig, sheep, ox-hide corium are the corner blanking of process hides processing.
(2) shredding: collagenous fibres and hot-melt adhesive fiber are used the opener shredding respectively.
(3) mix shredding: collagenous fibres and hot-melt adhesive fiber are mixed by the 99%:1% weight proportion through dosing machine metering back, the formation blended fiber, then with blended fiber with opener mixing shredding.
(4) lapping:
(4-1) combing lapping: with blended fiber with the combing of combing lapping machine after, with combing lapping machine through the staggered lapping of broadwise, be paved into equably grammes per square metre 100～200 grams/square metre fibre web;
(4-2) air-laid: adopt the air-laid machine with the lapping of blended fiber stereo staggered, be paved into equably grammes per square metre 250～1000 grams/square metre fibre web.
(5) thorn is solid: the fibre web elder generation process of completing is prewetted, the pressure of prewetting is 2～6MPa, the time of prewetting is 2～5 seconds, then sting in advance again, pre-thorn pressure is 30～80MPa, and the thorn time is 1～3 second in advance, and the High-Pressure Water with 200～300MPa carries out positive and negative thorn admittedly then, press dry moisture at last, the formation moisture is 10～20% base cloth.
(6) heat treatment: earlier with base cloth preliminary drying 3～8 minutes in 40～60 ℃ of hot blasts earlier, allow base cloth carry out hot rolling by a pair roller again and make the hot-melt adhesive fiber bond vitrified live collagenous fibres, 80～100 ℃ of roller temperatures, 1.5～2 meters/minute of speed, pressure 3.5～4.5Pa, cooling subsequently.
(7) side cut, rolling, packing: after the part that the gained base cloth is irregular, unnecessary trims, rolling, packing.
Embodiment 4
This law is bright to relate to a kind of regenerated collagen fiber skin, and the Web materials of this regenerated bark is formed and percentage by weight is: collagenous fibres 85%, hot-melt adhesive fiber 15%.Wherein, collagenous fibres length is 1～3cm.The thickness of this regenerated bark is 0.5～3mm, and all more than 23N, horizontal and vertical TENSILE STRENGTH is all more than 68N for horizontal and vertical tearing toughness.Wherein, be example with the performance of 1mm thickness regenerated bark, its result is presented in the table 1.
The invention still further relates to a kind of method of making above-mentioned regenerated collagen fiber skin, it may further comprise the steps successively:
(1) separate fibre: pig, sheep, ox-hide corium are separated fibre, form collagenous fibres, wherein pig, sheep, ox-hide corium are the corner blanking of process hides processing;
(2) shredding: collagenous fibres and hot-melt adhesive fiber are used the opener shredding respectively;
(3) mix shredding: collagenous fibres and hot-melt adhesive fiber are mixed by the 85%:15% weight proportion through dosing machine metering back, the formation blended fiber, then with blended fiber with opener mixing shredding;
(4) lapping: blended fiber is paved into fibre web equably;
(4-1) combing lapping: with blended fiber with the combing of combing lapping machine after, with combing lapping machine through the staggered lapping of broadwise, form grammes per square metre 100～200 grams/square metre fibre web;
(4-2) air-laid: adopt the air-laid machine with the lapping of blended fiber stereo staggered, form grammes per square metre 250～1000 grams/square metre fibre web.
(5) thorn is solid: the fibre web elder generation process of completing is prewetted, the pressure of prewetting is 2～6MPa, the time of prewetting is 2～5 seconds, then sting in advance again, pre-thorn pressure is 30～80MPa, and the thorn time is 1～3 second in advance, and the High-Pressure Water with 200～300MPa carries out positive and negative thorn admittedly then, press dry moisture at last, the formation moisture is 25～30% base cloth.
(6) heat treatment: with base cloth preliminary drying 3～8 minutes in 40～60 ℃ of hot blasts earlier, then cured 3～6 minutes in 80～100 ℃ of hot blasts earlier, the total time that stops in hot blast is 6～12 minutes, makes the hot-melt adhesive fiber bond vitrified live collagenous fibres, cools off subsequently.
(7) side cut, rolling, packing: after the part that the gained base cloth is irregular, unnecessary trims, rolling, packing.
Comparative Examples 1
A kind of regenerated collagen fiber skin, its fibre web is made up of 100% collagenous fibres; Wherein, the length of collagenous fibres is 1～3cm.Its manufacture method is: be that the collagenous fibres of 1～3cm are raw material with length, after the shredding of collagenous fibres usefulness opener, then use successively combing lapping machine with the air-laid machine lapping become grammes per square metre 250～1000 gram/square metre fibre web, obtain product after, side cut solid through stinging, the rolling, wherein, corresponding operation is identical among the solid operation of lapping operation and thorn and the embodiment 1.The horizontal and vertical tearing toughness of the regenerative leather that obtains by this technology is 18～27N, and horizontal and vertical TENSILE STRENGTH is 46～82N.Wherein, be example with the performance of 1mm thickness regenerated bark, its result is presented in the table 1.
Above-mentioned each embodiment is to preferred embodiment of the present invention.Should be pointed out that for those skilled in the art under the prerequisite that does not break away from the technology of the present invention principle, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Table 1
Claims (10)
1. regenerated collagen fiber skin is characterized in that: its Web materials is formed and percentage by weight is: collagenous fibres 85 ~ 99%, hot-melt adhesive fiber 1 ~ 15%; All more than 23N, horizontal and vertical TENSILE STRENGTH is all more than 68N for the horizontal and vertical tearing toughness of this regenerated bark.
2. method of making the described regenerated collagen fiber skin of claim 1 is characterized in that may further comprise the steps successively:
(1) separates fibre: corium is separated fibre, form collagenous fibres;
(2) shredding: collagenous fibres and hot-melt adhesive fiber are used the opener shredding respectively;
(3) mix shredding: collagenous fibres and hot-melt adhesive fiber are mixed after the dosing machine metering, form blended fiber, then with blended fiber with opener mixing shredding;
(4) lapping: blended fiber is paved into fibre web equably;
(5) thorn is solid: the fibre web of completing is carried out positive and negative thorn handle admittedly, form base cloth;
(6) heat treatment: the solid back of thorn base cloth makes the hot-melt adhesive fiber bond vitrified live collagenous fibres through heat treatment, cooling subsequently;
(7) side cut, rolling, packing: after the part that the gained base cloth is irregular, unnecessary trims, rolling, packing.
3. manufacture method as claimed in claim 2 is characterized in that: corium is the corner blanking of pig, sheep, ox-hide process hides processing in the described step (1).
4. manufacture method as claimed in claim 2 is characterized in that: collagenous fibres and hot-melt adhesive fiber mix by 92 ~ 95%:5 ~ 8% weight proportion in the described step (3).
5. manufacture method as claimed in claim 2, it is characterized in that: described step (4) comprises successively:
(4-1) combing lapping: with blended fiber with the combing of combing lapping machine after, with combing lapping machine through the staggered lapping of broadwise, form grammes per square metre 100 ~ 200 grams/square metre fibre web;
(4-2) air-laid: adopt the air-laid machine with the lapping of blended fiber stereo staggered, form grammes per square metre 250 ~ 1000 grams/square metre fibre web.
6. manufacture method as claimed in claim 2 is characterized in that: utilize special needing machine to carry out solid processing of positive and negative acupuncture thorn the fibre web of completing in the described step (5), form base cloth.
7. manufacture method as claimed in claim 2 is characterized in that: the thorn thorn is solid to be handled in the described step (5) fibre web of completing to be utilized High-Pressure Water more than the 200MPa just turning one's coat, and press dry moisture then, forms moisture and be 10 ~ 55% base cloth.
8. manufacture method as claimed in claim 2 is characterized in that: heat treatment is a kind of or its any combination during hot water, hot blast and hot rolling are handled in the described step (6).
9. manufacture method as claimed in claim 8, it is characterized in that: earlier moisture is no more than 55% base cloth in the described step (6) and immersed in 40 ~ 100 ℃ of hot water 5 ~ 15 minutes, press dry moisture then, pressing dry the back moisture is 10 ~ 55%, then cures 6 ~ 12 minutes in 40 ~ 100 ℃ of hot blasts.
10. manufacture method as claimed in claim 9 is characterized in that: in the described step (6), when hot blast cured, preliminary drying 3 ~ 8 minutes in 40 ~ 60 ℃ of hot blasts was dried 3 ~ 6 minutes in 80 ~ 100 ℃ of hot blasts more earlier.
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| CN201310119337.XA CN103233325B (en) | 2013-04-08 | 2013-04-08 | A kind of Collagenous fiber bonded leather and manufacture method thereof |
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| CN201310119337.XA CN103233325B (en) | 2013-04-08 | 2013-04-08 | A kind of Collagenous fiber bonded leather and manufacture method thereof |
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| CN104963087A (en) * | 2015-06-08 | 2015-10-07 | 吴琦 | Manufacturing technology for regenerated bark with high-tearing and high-peeling properties |
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| CN106987931A (en) * | 2017-03-31 | 2017-07-28 | 江阴骏华纺织科技有限公司 | A kind of inexpensive kraft fibers leather production line |
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| CN108660607A (en) * | 2017-03-31 | 2018-10-16 | 江阴骏华纺织科技有限公司 | A kind of the collagenous fibres ox fibre skin and its manufacturing method of low production cost |
| CN110016764A (en) * | 2019-04-27 | 2019-07-16 | 泉州伟明工贸有限公司 | A kind of ox-hide regenerated fiber synthetic leather preparation method |
| US11001679B2 (en) | 2016-02-15 | 2021-05-11 | Modern Meadow, Inc. | Biofabricated material containing collagen fibrils |
| US11214844B2 (en) | 2017-11-13 | 2022-01-04 | Modern Meadow, Inc. | Biofabricated leather articles having zonal properties |
| US11352497B2 (en) | 2019-01-17 | 2022-06-07 | Modern Meadow, Inc. | Layered collagen materials and methods of making the same |
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