CN103233325B - A kind of Collagenous fiber bonded leather and manufacture method thereof - Google Patents
A kind of Collagenous fiber bonded leather and manufacture method thereof Download PDFInfo
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Abstract
The present invention relates to a kind of Collagenous fiber bonded leather, its Web materials composition and percentage by weight thereof are: collagenous fibres 85 ~ 99%, hot-melt adhesive fiber 1 ~ 15%; The horizontal and vertical tearing toughness of this regenerated bark is all more than 23N, and horizontal and vertical hot strength is all more than 68N, and feel approaches corium, can be used as senior handbag, template sofa material. The invention still further relates to a kind of method of manufacturing this regenerated bark, its technical process comprise successively separate that fibre, shredding, mixing shredding, lapping, thorn are solid, heat treatment, trimming, rolling and packaging and other steps. 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 fibre web is fixed, improve cancellated compactness in fibre web, thereby significantly improved the intensity of regenerated bark.
Description
Technical field
The present invention relates to non-woven material and manufacture method thereof, be specifically related to a kind of Collagenous fiber bonded leather andManufacture method.
Background technology
The tailing quantity of natural leather is very large, if it is carried out to secondary utilization, particularly secondary operations becomesRegenerated bark, can produce sizable wealth, energy-saving and environment friendly be produced to positive meaning simultaneously. At present,Utilize the method that the tailing of natural leather is processed into regenerated bark to comprise: fragment Method for bonding, fiber Method for bonding andThe solid method of fiber thorn.
Wherein, fragment Method for bonding refers to and first corium is processed into corium fine grained chippings bonding cutification again; Obtain through this methodThe regenerated bark arriving, its feel and intensity are all far away from natural leather. Fiber Method for bonding and the solid method of fiber thorn respectively have excellentShortcoming: fiber Method for bonding refers to and first corium is processed into collagenous fibres recycling hot-melt adhesive fiber by collagenous fibresBe glued together, form regenerated bark, the fibre strength that obtains through this method is high but feel is poor; The solid method of fiber thorn refers to elder generationCorium is processed into collagenous fibres and then lapping, the solid cutification of thorn, and the fibre strength obtaining through this method is slightly inferior, butFeel approaches corium.
For avoiding reducing the feel of regenerated bark, in the fiber Method for bonding described in patent CN102115955B,The fibre web that is specially provided with bottom and top layer has high collagen contents (97% percetage by weight, 3% poly-breastAcid bicomponent fibre), and intermediate layer fibre web adopts 100% PLA bicomponent fibre, utilizes intermediate layer fibre webIn PLA bicomponent fibre and bottom and top layer fibre web in the hot melt of a small amount of PLA bicomponent fibreCohesive is glued together collagenous fibres, has avoided regenerated bark surface because containing too much hot-melt adhesive fiber simultaneouslyMake feel variation. The lapping but this method need to separately be prepared burden, cumbersome in technique, simultaneously in the methodIn, only rely on hot-melt adhesive fiber adhesive glue fibrillation, between hot-melt adhesive fiber and collagenous fibres, lack effectivelyTangle, hot-melt adhesive fiber also only plays the effect of similar thermal fusing powder, and the mechanical strength of regenerated bark is difficult toImproved fully.
For the shortcoming of existing fiber Method for bonding, therefore, be necessary to develop one and there is high strength and good handCollagenous fiber bonded leather and a kind of process for the manufacture of this Collagenous fiber bonded leather of sense.
Summary of the invention
The technical issues that need to address of the present invention are to provide a kind of collagen fibre with high strength and excellent handleDimension regenerated bark.
Meanwhile, the technical issues that need to address of the present invention are also to provide a kind of for the manufacture of this collagenous fibresThe simple process method of regenerated bark.
The technical issues that need to address of the present invention are achieved through the following technical solutions:
A kind of Collagenous fiber bonded leather, its Web materials composition and percentage by weight thereof are: collagenous fibres85～99%, hot-melt adhesive fiber 1～15%; The horizontal and vertical tearing toughness of this regenerated bark is all at 23NAbove, horizontal and vertical hot strength is all more than 68N. Preferably, hot-melt adhesive fiber in fibre webPercetage by weight is 5～8%; Collagenous fibres length is 1～3cm.
A method of manufacturing above-mentioned Collagenous fiber bonded leather, it comprises the following steps successively:
(1) separate fibre: corium is separated to fibre, form collagenous fibres;
(2) shredding: collagenous fibres and hot-melt adhesive fiber are used respectively to opener shredding;
(3) mix shredding: collagenous fibres and hot-melt adhesive fiber are mixed after dosing machine metering, formComposite fibre, then by opener mixing shredding for composite fibre;
(4) lapping: composite fibre is paved into fibre web equably;
(5) thorn is solid: the fibre web of completing is carried out to positive and negative thorn and admittedly process, form base cloth;
(6) heat treatment: after thorn is solid, base cloth makes hot-melt adhesive fiber bond vitrified live collagenous fibres through heat treatment, withCooling afterwards;
(7) trimming, rolling, packaging: after part irregular, unnecessary gained base cloth is trimmed, rolling, bagDress.
Preferably, in above-mentioned manufacture method, in step (1), corium is the limit of pig, sheep, ox-hide process hides processingAngle blanking.
Preferably, in above-mentioned manufacture method, in step (3), collagenous fibres and hot-melt adhesive fiber are by 92～95%:5～8% weight proportions mix.
Preferably, in above-mentioned manufacture method, step (4) comprises successively:
(4-1) combing lapping: with after the combing of combing lapping machine, use combing lapping machine through the staggered paving of broadwise composite fibreNet, the fibre web that formation grammes per square metre is 100～200 grams/m;
(4-2) air-laid: adopt air-laid machine by the lapping of composite fibre stereo staggered, form grammes per square metre 250～1000Gram/m fibre web.
Preferably, in above-mentioned manufacture method, in step (5), utilize special needing machine to carry out the fibre web of completingThe solid processing of positive and negative acupuncture thorn, forms base cloth.
Preferably, in above-mentioned manufacture method, step is utilized the fibre web of completing more than 200MPa in (5)High-Pressure Water is just being turned one's coat, and thorn thorn is solid to be processed, and then press dry moisture, the base cloth that formation water content is 10～55%.
Preferably, in above-mentioned manufacture method, in step (6), heat treatment is during hot water, hot blast and hot rolling are processedA kind of or its any combination.
Further preferably, in above-mentioned manufacture method, in step (6), first water content is no more than to 55% baseCloth immerses in 40～100 DEG C of hot water 5～15 minutes, then press dry moisture, and pressing dry rear water content is 10～55%,Then in 40～100 DEG C of hot blasts, cure 6～12 minutes.
Still more preferably, in above-mentioned manufacture method, in step (6), when hot blast cures, first 40～60Preliminary drying 3～8 minutes in DEG C hot blast, then dry 3～6 minutes in 80～100 DEG C of hot blasts.
Compared with prior art, the present invention has the following advantages:
1. a kind of Collagenous fiber bonded leather of the present invention and manufacture method thereof, in the method, the solid processing of thorn makes listIndividual hot-melt adhesive fiber can form more winding knot with collagenous fibres before the bound collagen fiber that is heatedStructure, relends and helps heat treatment, and the winding arrangement in fibre web is fixed, and has improved in fibre web cancellatedCompactness, thus significantly improve the intensity of regenerated bark.
2. a kind of Collagenous fiber bonded leather of the present invention and manufacture method thereof, in the method, collagenous fibres and heatThe first shredding separately of fusible condensating fiber, then mix shredding, in the fibre web that makes to be paved into, two kinds of fibers are evenly distributed,Avoid regenerated bark intensity inequality, thereby improved on the whole the performances such as the intensity of regenerated bark.
3. a kind of Collagenous fiber bonded leather of the present invention and manufacture method thereof, in the method, also can adopt traditionWater jet process completes the solid processing of base cloth thorn; In the time of heat treatment, first directly in hot water, make hot melting cohesion fiberTo a certain degree softening, and then step heating cures, and avoids collagenous fibres because at high temperature crossing long-time stopAnd it is deteriorated that intensity is occurred.
4. a kind of Collagenous fiber bonded leather of the present invention and manufacture method thereof, in the method, by fibre web materialIn material, mix a small amount of hot-melt adhesive fiber, when regenerated bark intensity is improved, also do not affect regenerated barkThe feel on surface; Especially on mixed weight when 5～8% hot-melt adhesive fiber, regenerated bark intensity and feel itBetween reached good balance.
This Collagenous fiber bonded leather tearing toughness and hot strength are high, and the feel on surface approaches corium, availableMake senior handbag and template sofa material etc.
Detailed description of the invention
Below in conjunction with embodiment, the specific embodiment of the present invention is described further. Following examples onlyFor technical scheme of the present invention is more clearly described, and can not limit the scope of the invention with this.
First the evaluation method, following each embodiment being adopted is carried out general description.
Tensile properties: based on the stretching test method of JIS-L1096-1964 fabric, measure tensile break strength.Wherein, taking the direct of travel of the fabric treating not of tangling as longitudinally, the not direct of travel of fabric treating hangs down with tanglingStraight direction is laterally, measures respectively on transverse and longitudinal. In addition, condition determination be 23 DEG C of temperature,Under the environmental condition of humidity 65%, carry out.
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 in direction. In addition, condition determination is in 23 DEG C of temperature, humidity 65%Environmental condition under carry out.
Embodiment 1
Bright a kind of Collagenous fiber bonded leather, Web materials composition and the weight percent thereof of this regenerated bark of relating to of this lawThan being: collagenous fibres 92%, hot-melt adhesive fiber 8%. Wherein, collagenous fibres length is 1～3cm. This againThe thickness of rawhide is 0.5～3mm, and horizontal and vertical tearing toughness is all more than 23N, horizontal and verticalHot strength all more than 68N. Wherein, taking the performance of 1mm thickness regenerated bark as example, its result showsIn table 1.
The invention still further relates to a kind of method of manufacturing above-mentioned Collagenous fiber bonded leather, it comprises the following steps successively:
(1) separate fibre: pig, sheep, ox-hide corium are separated to fibre, form collagenous fibres, wherein pig, sheep, oxSkin corium is the corner blanking of process hides processing.
(2) shredding: collagenous fibres and hot-melt adhesive fiber are used respectively to opener shredding.
(3) mix shredding: collagenous fibres and hot-melt adhesive fiber are pressed to 92%:8% weight after dosing machine meteringProportioning is mixed, and forms composite fibre, then by opener mixing shredding for composite fibre.
(4) lapping:
(4-1) combing lapping: composite fibre, with after the combing of combing lapping machine, is handed over through broadwise with combing lapping machineWrong lapping, is paved into the fibre web of 100～200 grams/m of grammes per square metres equably;
(4-2) air-laid: adopt air-laid machine by the lapping of composite fibre stereo staggered, be paved into equably gramWeigh the fibre web of 250～1000 grams/m.
(5) thorn is solid: utilize special needing machine to carry out positive and negative thorn the fibre web of completing and admittedly process, form base cloth.
(6) heat treatment: the solid relief base cloth of thorn carries out hot rolling by a pair roller makes hot-melt adhesive fiber bond vitrifiedLive collagenous fibres, 80～100 DEG C of roller temperatures, 1.5～2 ms/min of speed, pressure 3.5～4.5Pa is cold subsequentlyBut.
(7) trimming, rolling, packaging: after part irregular, unnecessary gained base cloth is trimmed, rolling, bagDress.
Embodiment 2
Bright a kind of Collagenous fiber bonded leather, Web materials composition and the weight percent thereof of this regenerated bark of relating to of this lawThan being: collagenous fibres 95%, hot-melt adhesive fiber 5%. Wherein, collagenous fibres length is 1～3cm. This againThe thickness of rawhide is 0.5～3mm, and horizontal and vertical tearing toughness is all more than 23N, horizontal and verticalHot strength all more than 68N. Wherein, taking the performance of 1mm thickness regenerated bark as example, its result showsIn table 1.
The invention still further relates to a kind of method of manufacturing above-mentioned Collagenous fiber bonded leather, it comprises the following steps successively:
(1) separate fibre: pig, sheep, ox-hide corium are separated to fibre, form collagenous fibres, wherein pig, sheep, oxSkin corium is the corner blanking of process hides processing.
(2) shredding: collagenous fibres and hot-melt adhesive fiber are used respectively to opener shredding.
(3) mix shredding: collagenous fibres and hot-melt adhesive fiber are pressed to 95%:5% weight after dosing machine meteringProportioning is mixed, and forms composite fibre, then by opener mixing shredding for composite fibre.
(4) lapping:
(4-1) combing lapping: composite fibre, with after the combing of combing lapping machine, is handed over through broadwise with combing lapping machineWrong lapping, is paved into the fibre web of 100～200 grams/m of grammes per square metres equably;
(4-2) air-laid: adopt air-laid machine by the lapping of composite fibre stereo staggered, be paved into equably gramWeigh the fibre web of 250～1000 grams/m.
(5) thorn is solid: by the fibre web of completing, first through prewetting, the pressure of prewetting is 2～6MPa, and the time of prewetting is 2～5Second, then sting in advance again, stinging in advance pressure is 30～80MPa, the thorn time is 1～3 second in advance, then withIt is solid that the High-Pressure Water of 200～300MPa carries out positive and negative thorn, finally press dry moisture, and forming water content is 55～60%Base cloth.
(6) heat treatment: first base cloth is immersed in 40～100 DEG C of hot water 5～15 minutes, then press dry moisture, pressAfter dry, water content is 55～60%, then preliminary drying 3～8 minutes in 40～60 DEG C of hot blasts, then 80～100 DEG C of heatIn wind, dry 3～6 minutes, the total time stopping in hot blast is 6～12 minutes, cooling subsequently.
(7) trimming, rolling, packaging: after part irregular, unnecessary gained base cloth is trimmed, rolling, bagDress.
Embodiment 3
Bright a kind of Collagenous fiber bonded leather, Web materials composition and the weight percent thereof of this regenerated bark of relating to of this lawThan being: collagenous fibres 99%, hot-melt adhesive fiber 1%. Wherein, collagenous fibres length is 1～3cm. This againThe thickness of rawhide is 0.5～3mm, and horizontal and vertical tearing toughness is all more than 23N, horizontal and verticalHot strength all more than 68N. Wherein, taking the performance of 1mm thickness regenerated bark as example, its result showsIn table 1.
The invention still further relates to a kind of method of manufacturing above-mentioned Collagenous fiber bonded leather, it comprises the following steps successively:(1) separate fibre: pig, sheep, ox-hide corium are separated to fibre, form collagenous fibres, wherein pig, sheep, oxSkin corium is the corner blanking of process hides processing.
(2) shredding: collagenous fibres and hot-melt adhesive fiber are used respectively to opener shredding.
(3) mix shredding: collagenous fibres and hot-melt adhesive fiber are pressed to 99%:1% weight after dosing machine meteringProportioning is mixed, and forms composite fibre, then by opener mixing shredding for composite fibre.
(4) lapping:
(4-1) combing lapping: with after the combing of combing lapping machine, use combing lapping machine through the staggered paving of broadwise composite fibreNet, is paved into the fibre web of 100～200 grams/m of grammes per square metres equably;
(4-2) air-laid: adopt air-laid machine by the lapping of composite fibre stereo staggered, be paved into equably grammes per square metreThe fibre web of 250～1000 grams/m.
(5) thorn is solid: by the fibre web of completing, first through prewetting, the pressure of prewetting is 2～6MPa, and the time of prewetting is 2～5Second, then sting in advance again, stinging in advance pressure is 30～80MPa, the thorn time is 1～3 second in advance, then withIt is solid that the High-Pressure Water of 200～300MPa carries out positive and negative thorn, finally press dry moisture, and forming water content is 10～20%Base cloth.
(6) heat treatment: first by first preliminary drying 3～8 minutes in 40～60 DEG C of hot blasts of base cloth, then it is a pair of to allow base cloth pass throughRoll carries out hot rolling makes hot-melt adhesive fiber bond vitrified live collagenous fibres, 80～100 DEG C of roller temperatures, speed1.5～2 ms/min, pressure 3.5～4.5Pa, cooling subsequently.
(7) trimming, rolling, packaging: after part irregular, unnecessary gained base cloth is trimmed, rolling, bagDress.
Embodiment 4
Bright a kind of Collagenous fiber bonded leather, Web materials composition and the weight percent thereof of this regenerated bark of relating to of this lawThan being: collagenous fibres 85%, hot-melt adhesive fiber 15%. Wherein, collagenous fibres length is 1～3cm. ShouldThe thickness of regenerated bark is 0.5～3mm, and horizontal and vertical tearing toughness is all more than 23N, laterally with verticalTo hot strength all more than 68N. Wherein, taking the performance of 1mm thickness regenerated bark as example, its result is aobviousBe shown in table 1.
The invention still further relates to a kind of method of manufacturing above-mentioned Collagenous fiber bonded leather, it comprises the following steps successively:
(1) separate fibre: pig, sheep, ox-hide corium are separated to fibre, form collagenous fibres, wherein pig, sheep, oxSkin corium is the corner blanking of process hides processing;
(2) shredding: collagenous fibres and hot-melt adhesive fiber are used respectively to opener shredding;
(3) mix shredding: collagenous fibres and hot-melt adhesive fiber are pressed to 85%:15% heavily after dosing machine meteringAmount proportioning is mixed, and forms composite fibre, then by opener mixing shredding for composite fibre;
(4) lapping: composite fibre is paved into fibre web equably;
(4-1) combing lapping: composite fibre, with after the combing of combing lapping machine, is handed over through broadwise with combing lapping machineWrong lapping, the fibre web that formation grammes per square metre is 100～200 grams/m;
(4-2) air-laid: adopt air-laid machine by the lapping of composite fibre stereo staggered, form grammes per square metreThe fibre web of 250～1000 grams/m.
(5) thorn is solid: by the fibre web of completing, first through prewetting, the pressure of prewetting is 2～6MPa, and the time of prewetting is 2～5Second, then sting in advance again, stinging in advance pressure is 30～80MPa, the thorn time is 1～3 second in advance, then withIt is solid that the High-Pressure Water of 200～300MPa carries out positive and negative thorn, finally press dry moisture, and forming water content is 25～30%Base cloth.
(6) heat treatment: first by first preliminary drying 3～8 minutes in 40～60 DEG C of hot blasts of base cloth, then at 80～100 DEG CIn hot blast, cure 3～6 minutes, the total time stopping in hot blast is 6～12 minutes, makes hot-melt adhesive fiber moltenMelt and be bonding to collagenous fibres, cooling subsequently.
(7) trimming, rolling, packaging: after part irregular, unnecessary gained base cloth is trimmed, rolling, bagDress.
Comparative example 1
A kind of Collagenous fiber bonded leather, its fibre web is made up of 100% collagenous fibres; Wherein, collagenous fibresLength be 1～3cm. Its manufacture method is: the collagenous fibres taking length as 1～3cm are raw material, by collagen fibreAfter Wesy's opener shredding, lapping becomes grammes per square metre with air-flow lapping machine then to use successively combing lapping machineThe fibre web of 250～1000 grams/m, obtains product after, trimming solid through stinging, rolling, wherein, and lapping operationAnd the solid operation of thorn is identical with corresponding operation in embodiment 1. The regenerative leather obtaining by this technique laterallyWith longitudinal tearing toughness be 18～27N, horizontal and vertical hot strength is 46～82N. Wherein, with 1mmThe performance of thickness regenerated bark is example, and its result is presented in table 1.
Above-mentioned each embodiment is to the preferred embodiment of the present invention. It should be pointed out that for the artThose of ordinary skill, not departing under the prerequisite of the technology of the present invention principle, can also make some changingEnter and retouch, these improvements and modifications also should be considered as protection scope of the present invention.
Table 1
Claims (10)
1. a Collagenous fiber bonded leather, is characterized in that: its Web materials composition and percentage by weight thereof are: collagenous fibres 85 ~ 99%, hot-melt adhesive fiber 1 ~ 15%; The horizontal and vertical tearing toughness of this regenerated bark is all more than 23N, and horizontal and vertical hot strength is all more than 68N, and collagenous fibres length is 1-3cm, and single hot-melt adhesive fiber and many collagenous fibres form winding arrangement.
2. a method of manufacturing Collagenous fiber bonded leather described in claim 1, is characterized in that comprising the following steps successively:
(1) separate fibre: corium is separated to fibre, form collagenous fibres;
(2) shredding: collagenous fibres and hot-melt adhesive fiber are used respectively to opener shredding;
(3) mix shredding: collagenous fibres and hot-melt adhesive fiber are mixed after dosing machine metering, form composite fibre, then by opener mixing shredding for composite fibre;
(4) lapping: composite fibre is paved into fibre web equably;
(5) thorn is solid: the fibre web of completing is carried out to positive and negative thorn and admittedly process, form base cloth;
(6) heat treatment: after thorn is solid, base cloth makes hot-melt adhesive fiber bond vitrified live collagenous fibres through heat treatment, cooling subsequently;
(7) trimming, rolling, packaging: after part irregular, unnecessary gained base cloth is trimmed, rolling, packaging.
3. manufacture method as claimed in claim 2, is characterized in that: in described step (1), corium is the corner blanking of pig, sheep, ox-hide process hides processing.
4. manufacture method as claimed in claim 2, is characterized in that: in described step (3), collagenous fibres and hot-melt adhesive fiber mix by 92 ~ 95%:5 ~ 8% weight proportion.
5. manufacture method as claimed in claim 2, is characterized in that: described step (4) comprises successively:
(4-1) combing lapping: composite fibre, with after the combing of combing lapping machine, through the staggered lapping of broadwise, is formed to the fibre web of 100 ~ 200 grams/m of grammes per square metres with combing lapping machine;
(4-2) air-laid: adopt air-laid machine by the lapping of composite fibre stereo staggered, form the fibre web of 250 ~ 1000 grams/m of grammes per square metres.
6. manufacture method as claimed in claim 2, is characterized in that: in described step (5), the fibre web of completing is utilized special needing machine to carry out solid processing of positive and negative acupuncture thorn, form base cloth.
7. manufacture method as claimed in claim 2, is characterized in that: in described step (5), the fibre web of completing being utilized more than 200MPa High-Pressure Water just turning one's coat, thorn thorn is solid processes, and then press dry moisture, the base cloth that to form water content be 10 ~ 55%.
8. manufacture method as claimed in claim 2, is characterized in that: in described step (6), heat treatment is a kind of or its any combination during hot water, hot blast and hot rolling are processed.
9. manufacture method as claimed in claim 8, it is characterized in that: in described step (6), first water content is no more than to 55% base cloth and immerses in 40 ~ 100 DEG C of hot water 5 ~ 15 minutes, then press dry moisture, pressing dry rear water content is 10 ~ 55%, then in 40 ~ 100 DEG C of hot blasts, cures 6 ~ 12 minutes.
10. manufacture method as claimed in claim 9, is characterized in that: in described step (6), and when hot blast cures, first preliminary drying 3 ~ 8 minutes in 40 ~ 60 DEG C of hot blasts, then dry 3 ~ 6 minutes in 80 ~ 100 DEG C of hot blasts.
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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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| CN105755845B (en) * | 2016-04-29 | 2018-05-25 | 石家庄百分百塑材制造有限公司 | It is a kind of for corium fabric regenerated leather of flooring laminate base and preparation method thereof |
| 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 |
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| CN106990015B (en) * | 2017-04-08 | 2020-03-17 | 淄博黄河龙生物工程有限公司 | Method for detecting content of collagen fibers in collagen |
| AU2018253595A1 (en) | 2017-11-13 | 2019-05-30 | Modern Meadow, Inc. | Biofabricated leather articles having zonal properties |
| CN108265397A (en) * | 2018-04-09 | 2018-07-10 | 浙江思凯域新材料有限公司 | Footwear material decoration regenerated bark base fabric preparation method |
| CN108560140A (en) * | 2018-04-09 | 2018-09-21 | 浙江思凯域新材料有限公司 | Double-face leather clothes regeneration corium base fabric and preparation method thereof |
| CN113286864A (en) | 2019-01-17 | 2021-08-20 | 现代牧场股份有限公司 | Layered collagen material and preparation method thereof |
| 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 |
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