CN109972294A - A kind of preparation process of break-resistance tensile type non-woven fabrics flour packaging - Google Patents

A kind of preparation process of break-resistance tensile type non-woven fabrics flour packaging Download PDF

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Publication number
CN109972294A
CN109972294A CN201910276048.8A CN201910276048A CN109972294A CN 109972294 A CN109972294 A CN 109972294A CN 201910276048 A CN201910276048 A CN 201910276048A CN 109972294 A CN109972294 A CN 109972294A
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China
Prior art keywords
woven fabrics
break
flour packaging
preparation process
type non
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201910276048.8A
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Chinese (zh)
Inventor
高彬
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shandong Cai Hui Packaging Technology Co Ltd
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Shandong Cai Hui Packaging Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shandong Cai Hui Packaging Technology Co Ltd filed Critical Shandong Cai Hui Packaging Technology Co Ltd
Priority to CN201910276048.8A priority Critical patent/CN109972294A/en
Publication of CN109972294A publication Critical patent/CN109972294A/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/74—Auxiliary operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/74—Auxiliary operations
    • B31B70/88—Printing; Embossing
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/005—Synthetic yarns or filaments
    • D04H3/007—Addition polymers
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/02—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments
    • D04H3/04—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments in rectilinear paths, e.g. crossing at right angles
    • D04H3/045—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments in rectilinear paths, e.g. crossing at right angles for net manufacturing
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
    • D04H3/14—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic yarns or filaments produced by welding
    • D04H3/153—Mixed yarns or filaments

Abstract

The invention discloses a kind of preparation processes of break-resistance tensile type non-woven fabrics flour packaging, including 3s non-woven fabrics, the 3s non-woven fabrics includes polypropylene, polyisobutene, nanometer polytetrafluoroethylcomposite and softening agent, and reinforced modifier, the preparation process of the break-resistance tensile type non-woven fabrics flour packaging include the following steps；By adding polypropylene, polyisobutene, nanometer polytetrafluoroethylcomposite and softening agent in a manufacturing process, and reinforced modifier, the fiber of aramid fiber and high-tenacity terylene degree is also used simultaneously, and in post-production, flour packaging both sides carry out sewing both sides by automatic sewing, so that manufactured non-woven fabrics break-resistance and tensile property are greatly promoted, avoid being damaged in use and caused by rupture, simultaneously when flour is loaded in inside, provided endurance is also improved, and greatly reduces the use limitation of existing non-woven fabrics flour packaging.

Description

A kind of preparation process of break-resistance tensile type non-woven fabrics flour packaging
Technical field
The invention belongs to field of nonwoven fabric technology, and in particular to a kind of preparation of break-resistance tensile type non-woven fabrics flour packaging Technique.
Background technique
Non-woven fabrics flour packaging is widely used very early, at present with 2.5kg, 5kg, 10kg metering in supermarket Based on non-woven fabrics flour packaging, there are also 50kg non-woven fabrics flour packagings.Non-woven fabrics safety and environmental protection, ventilative pole are stored conducive to flour, It was substituted cloth bag in recent years, woven bag becomes the mainstream of flour packaging.Non-woven fabrics flour packaging is quality-high and inexpensive, is flour packet The first choice of dress, more suitable for the slightly higher flour packaging of class, wherein the kind to non-woven fabrics is also classified, 3s non-woven fabrics is then One of model in kind used.
Existing non-woven fabrics flour packaging still has some shortcomings when in use: existing non-woven fabrics flour packaging In use, it needs to fill the objects such as powder of having one's face covered with, therefore flour packaging made of non-woven fabrics is in bulging state in use, is needed Biggish Inner extrusion power is provided, while non-woven fabrics is relatively easy to again by various damages such as outside scuffings, so as to cause surface It ruptures, causes the waste of product, the break-resistance tensile property needs of non-woven fabrics flour packaging are improved.
Summary of the invention
The purpose of the present invention is to provide a kind of preparation processes of break-resistance tensile type non-woven fabrics flour packaging, on solving State the problem of proposing in background technique.
To achieve the above object, the invention provides the following technical scheme: a kind of break-resistance tensile type non-woven fabrics flour packaging Preparation process, including 3s non-woven fabrics, the 3s non-woven fabrics include polypropylene, polyisobutene, nanometer polytetrafluoroethylcomposite and softness Agent and reinforced modifier, the preparation process of the break-resistance tensile type non-woven fabrics flour packaging the following steps are included:
Step 1: by polypropylene, polyisobutene, nanometer polytetrafluoroethylcomposite and softening agent and reinforced modifier, according to one Certainty ratio is placed in mixing drum, and is mixed uniformly, and high strength fibre is added after mixing, is stirred, dry；
Step 2: the fiber dried in step 1 is sent into opener mixed cotton, and is combed into linearly, fibre web is made Shape；
Step 3: linearly fibre web is sent into lapping machine, and is mutually laid in 90 degree of intersections；
Step 4: obtained fibre web is sent to drafting machine.
Step 5: under being continuously conveyed of Web forming conveyer belt, continuous fibre web passes through hot-rolling mill.
Step 6: under the rolloff effect of hot-rolling mill, fibre web forms non-woven fabrics.
Step 7: nonwoven surface obtained in step 6 is printed, overlay film, automatic moulding, automatic sewing, is packaged It examines；
Step 8: flour packaging specification after molding is 0.5,1,1.5,2.5,5,10,25kg.
Preferably, high strength fibre includes the fibers such as aramid fiber and terylene in the step 1.
Preferably, the softening agent is CE either SCM at least one therein.
Preferably, the reinforced modifier is nacrite, calcium carbonate, talcum powder, mica powder, wollastonite, kaolin, hydrogen Aluminium oxide, magnesium hydroxide at least one therein.
Preferably, the drafting multiple of drafting machine is 2.8~3.7 in the step 4.
Preferably, a length of 3~5 hours when dry in the step 1, temperature is 70~120 DEG C.
Preferably, the polypropylene proportion is 40%~60%, and the nanometer polytetrafluoroethylcomposite proportion is 3% ~5%.
Compared with prior art, the beneficial effects of the present invention are: by adding polypropylene, poly- isobutyl in a manufacturing process Alkene, nanometer polytetrafluoroethylcomposite and softening agent and reinforced modifier, while the fiber of aramid fiber and high-tenacity terylene degree is also used, with And in post-production, flour packaging both sides carry out sewing both sides by automatic sewing so that manufactured non-woven fabrics break-resistance and Tensile property is greatly promoted, avoid being damaged in use and caused by rupture, while when flour is loaded in inside, Provided endurance is also improved, and greatly reduces the use limitation of existing non-woven fabrics flour packaging.
Specific embodiment
The technical scheme in the embodiments of the invention will be clearly and completely described below, it is clear that described implementation Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common Technical staff's every other embodiment obtained without making creative work belongs to the model that the present invention protects It encloses.
Embodiment 1
The present invention provides a kind of technical solution: a kind of preparation process of break-resistance tensile type non-woven fabrics flour packaging, including 3s non-woven fabrics, 3s non-woven fabrics include polypropylene, polyisobutene, nanometer polytetrafluoroethylcomposite and softening agent and reinforced modifier, are prevented Rupture tensile type non-woven fabrics flour packaging preparation process the following steps are included:
Step 1: by polypropylene, polyisobutene, nanometer polytetrafluoroethylcomposite and softening agent and reinforced modifier, according to one Certainty ratio is placed in mixing drum, and is mixed uniformly, and high strength fibre is added after mixing, is stirred, dry；
Step 2: the fiber dried in step 1 is sent into opener mixed cotton, and is combed into linearly, fibre web is made Shape；
Step 3: linearly fibre web is sent into lapping machine, and is mutually laid in 90 degree of intersections；
Step 4: obtained fibre web is sent to drafting machine.
Step 5: under being continuously conveyed of Web forming conveyer belt, continuous fibre web passes through hot-rolling mill.
Step 6: under the rolloff effect of hot-rolling mill, fibre web forms non-woven fabrics.
Step 7: nonwoven surface obtained in step 6 is printed, overlay film, automatic moulding, automatic sewing, is packaged It examines；
Step 8: flour packaging specification after molding is 0.5,1,1.5,2.5,5,10,25kg.
In the present embodiment, it is preferred that high strength fibre includes the fibers such as aramid fiber and terylene in step 1.
In the present embodiment, it is preferred that softening agent SCM.
In the present embodiment, it is preferred that reinforced modifier is magnesium hydroxide.
In the present embodiment, it is preferred that the drafting multiple of drafting machine is 2.8 in step 4.
In the present embodiment, it is preferred that a length of 3 hours when dry in step 1, temperature is 70 DEG C.
In the present embodiment, it is preferred that polypropylene proportion is 40%, and nanometer polytetrafluoroethylcomposite proportion is 3%.
Embodiment 2
The present invention provides a kind of technical solution: a kind of preparation process of break-resistance tensile type non-woven fabrics flour packaging, including 3s non-woven fabrics, 3s non-woven fabrics include polypropylene, polyisobutene, nanometer polytetrafluoroethylcomposite and softening agent and reinforced modifier, are prevented Rupture tensile type non-woven fabrics flour packaging preparation process the following steps are included:
Step 1: by polypropylene, polyisobutene, nanometer polytetrafluoroethylcomposite and softening agent and reinforced modifier, according to one Certainty ratio is placed in mixing drum, and is mixed uniformly, and high strength fibre is added after mixing, is stirred, dry；
Step 2: the fiber dried in step 1 is sent into opener mixed cotton, and is combed into linearly, fibre web is made Shape；
Step 3: linearly fibre web is sent into lapping machine, and is mutually laid in 90 degree of intersections；
Step 4: obtained fibre web is sent to drafting machine.
Step 5: under being continuously conveyed of Web forming conveyer belt, continuous fibre web passes through hot-rolling mill.
Step 6: under the rolloff effect of hot-rolling mill, fibre web forms non-woven fabrics.
Step 7: nonwoven surface obtained in step 6 is printed, overlay film, automatic moulding, automatic sewing, is packaged It examines；
Step 8: flour packaging specification after molding is 0.5,1,1.5,2.5,5,10,25kg.
In the present embodiment, it is preferred that high strength fibre includes the fibers such as aramid fiber and terylene in step 1.
In the present embodiment, it is preferred that softening agent CE.
In the present embodiment, it is preferred that reinforced modifier is mica powder.
In the present embodiment, it is preferred that the drafting multiple of drafting machine is 3.4 in step 4.
In the present embodiment, it is preferred that a length of 3.5 hours when dry in step 1, temperature is 80 DEG C.
In the present embodiment, it is preferred that polypropylene proportion is 45%, and nanometer polytetrafluoroethylcomposite proportion is 3.5%.
Embodiment 3
The present invention provides a kind of technical solution: a kind of preparation process of break-resistance tensile type non-woven fabrics flour packaging, including 3s non-woven fabrics, 3s non-woven fabrics include polypropylene, polyisobutene, nanometer polytetrafluoroethylcomposite and softening agent and reinforced modifier, are prevented Rupture tensile type non-woven fabrics flour packaging preparation process the following steps are included:
Step 1: by polypropylene, polyisobutene, nanometer polytetrafluoroethylcomposite and softening agent and reinforced modifier, according to one Certainty ratio is placed in mixing drum, and is mixed uniformly, and high strength fibre is added after mixing, is stirred, dry；
Step 2: the fiber dried in step 1 is sent into opener mixed cotton, and is combed into linearly, fibre web is made Shape；
Step 3: linearly fibre web is sent into lapping machine, and is mutually laid in 90 degree of intersections；
Step 4: obtained fibre web is sent to drafting machine.
Step 5: under being continuously conveyed of Web forming conveyer belt, continuous fibre web passes through hot-rolling mill.
Step 6: under the rolloff effect of hot-rolling mill, fibre web forms non-woven fabrics.
Step 7: nonwoven surface obtained in step 6 is printed, overlay film, automatic moulding, automatic sewing, is packaged It examines；
Step 8: flour packaging specification after molding is 0.5,1,1.5,2.5,5,10,25kg.
In the present embodiment, it is preferred that high strength fibre includes the fibers such as aramid fiber and terylene in step 1.
In the present embodiment, it is preferred that softening agent SCM.
In the present embodiment, it is preferred that reinforced modifier is nacrite.
In the present embodiment, it is preferred that the drafting multiple of drafting machine is 3 in step 4.
In the present embodiment, it is preferred that a length of 4 hours when dry in step 1, temperature is 100 DEG C.
In the present embodiment, it is preferred that polypropylene proportion is 50%, and nanometer polytetrafluoroethylcomposite proportion is 4%.
Embodiment 4
The present invention provides a kind of technical solution: a kind of preparation process of break-resistance tensile type non-woven fabrics flour packaging, including 3s non-woven fabrics, 3s non-woven fabrics include polypropylene, polyisobutene, nanometer polytetrafluoroethylcomposite and softening agent and reinforced modifier, are prevented Rupture tensile type non-woven fabrics flour packaging preparation process the following steps are included:
Step 1: by polypropylene, polyisobutene, nanometer polytetrafluoroethylcomposite and softening agent and reinforced modifier, according to one Certainty ratio is placed in mixing drum, and is mixed uniformly, and high strength fibre is added after mixing, is stirred, dry；
Step 2: the fiber dried in step 1 is sent into opener mixed cotton, and is combed into linearly, fibre web is made Shape；
Step 3: linearly fibre web is sent into lapping machine, and is mutually laid in 90 degree of intersections；
Step 4: obtained fibre web is sent to drafting machine.
Step 5: under being continuously conveyed of Web forming conveyer belt, continuous fibre web passes through hot-rolling mill.
Step 6: under the rolloff effect of hot-rolling mill, fibre web forms non-woven fabrics.
Step 7: nonwoven surface obtained in step 6 is printed, overlay film, automatic moulding, automatic sewing, is packaged It examines；
Step 8: flour packaging specification after molding is 0.5,1,1.5,2.5,5,10,25kg.
In the present embodiment, it is preferred that high strength fibre includes the fibers such as aramid fiber and terylene in step 1.
In the present embodiment, it is preferred that softening agent CE.
In the present embodiment, it is preferred that reinforced modifier is magnesium hydroxide.
In the present embodiment, it is preferred that the drafting multiple of drafting machine is 3.7 in step 4.
In the present embodiment, it is preferred that a length of 5 hours when dry in step 1, temperature is 120 DEG C.
In the present embodiment, it is preferred that polypropylene proportion is 60%, and nanometer polytetrafluoroethylcomposite proportion is 5%.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding And modification, the scope of the present invention is defined by the appended.

Claims (7)

1. a kind of preparation process of break-resistance tensile type non-woven fabrics flour packaging, including 3s non-woven fabrics, it is characterised in that: the 3s Non-woven fabrics includes polypropylene, polyisobutene, nanometer polytetrafluoroethylcomposite and softening agent and reinforced modifier, and the break-resistance is anti- The preparation process of pull-up non-woven fabrics flour packaging the following steps are included:
Step 1: by polypropylene, polyisobutene, nanometer polytetrafluoroethylcomposite and softening agent and reinforced modifier, according to certain ratio Example is placed in mixing drum, and is mixed uniformly, and high strength fibre is added after mixing, is stirred, dry；
Step 2: the fiber dried in step 1 is sent into opener mixed cotton, and is combed into linearly, fibre web shape is made；
Step 3: linearly fibre web is sent into lapping machine, and is mutually laid in 90 degree of intersections；
Step 4: obtained fibre web is sent to drafting machine.
Step 5: under being continuously conveyed of Web forming conveyer belt, continuous fibre web passes through hot-rolling mill.
Step 6: under the rolloff effect of hot-rolling mill, fibre web forms non-woven fabrics.
Step 7: nonwoven surface obtained in step 6 is printed, overlay film, automatic moulding, automatic sewing, is packaged inspection It tests；
Step 8: flour packaging specification after molding is 0.5,1,1.5,2.5,5,10,25kg.
2. a kind of preparation process of break-resistance tensile type non-woven fabrics flour packaging according to claim 1, it is characterised in that: High strength fibre includes the fibers such as aramid fiber and terylene in the step 1.
3. a kind of preparation process of break-resistance tensile type non-woven fabrics flour packaging according to claim 1, it is characterised in that: The softening agent is CE either SCM at least one therein.
4. a kind of preparation process of break-resistance tensile type non-woven fabrics flour packaging according to claim 1, it is characterised in that: The reinforced modifier is nacrite, calcium carbonate, talcum powder, mica powder, wollastonite, kaolin, aluminium hydroxide, magnesium hydroxide At least one therein.
5. a kind of preparation process of break-resistance tensile type non-woven fabrics flour packaging according to claim 1, it is characterised in that: The drafting multiple of drafting machine is 2.8~3.7 in the step 4.
6. a kind of preparation process of break-resistance tensile type non-woven fabrics flour packaging according to claim 1, it is characterised in that: A length of 3~5 hours when dry in the step 1, temperature is 70~120 DEG C.
7. a kind of preparation process of break-resistance tensile type non-woven fabrics flour packaging according to claim 1, it is characterised in that: The polypropylene proportion is 40%~60%, and the nanometer polytetrafluoroethylcomposite proportion is 3%~5%.
CN201910276048.8A 2019-04-08 2019-04-08 A kind of preparation process of break-resistance tensile type non-woven fabrics flour packaging Pending CN109972294A (en)

Priority Applications (1)

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Application Number Priority Date Filing Date Title
CN201910276048.8A CN109972294A (en) 2019-04-08 2019-04-08 A kind of preparation process of break-resistance tensile type non-woven fabrics flour packaging

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111962212A (en) * 2020-08-13 2020-11-20 蒋俊 High-toughness medical non-woven fabric and preparation method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102344608A (en) * 2011-07-23 2012-02-08 佛山市衡龙科技有限公司 Composite material special for PP (Polypropylene) spun-bond non-woven fabric
CN102514235A (en) * 2011-11-01 2012-06-27 安吉振兴布业有限公司 Preparation method for oxygen barrier composite layer grain packing bag
US20160024699A1 (en) * 2014-07-25 2016-01-28 Illinois Tool Works, Inc. Particle-filled fiber and articles formed from the same
CN107587264A (en) * 2017-09-28 2018-01-16 嘉兴华丽非织布制品有限公司 A kind of frivolous high-strength producing technology of non-woven fabrics
CN108950866A (en) * 2018-08-31 2018-12-07 福建冠泓工业有限公司 A kind of anti-tear non-woven fabrics and preparation method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102344608A (en) * 2011-07-23 2012-02-08 佛山市衡龙科技有限公司 Composite material special for PP (Polypropylene) spun-bond non-woven fabric
CN102514235A (en) * 2011-11-01 2012-06-27 安吉振兴布业有限公司 Preparation method for oxygen barrier composite layer grain packing bag
US20160024699A1 (en) * 2014-07-25 2016-01-28 Illinois Tool Works, Inc. Particle-filled fiber and articles formed from the same
CN107587264A (en) * 2017-09-28 2018-01-16 嘉兴华丽非织布制品有限公司 A kind of frivolous high-strength producing technology of non-woven fabrics
CN108950866A (en) * 2018-08-31 2018-12-07 福建冠泓工业有限公司 A kind of anti-tear non-woven fabrics and preparation method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111962212A (en) * 2020-08-13 2020-11-20 蒋俊 High-toughness medical non-woven fabric and preparation method thereof
CN111962212B (en) * 2020-08-13 2021-05-04 联丰医用卫生材料(始兴)有限公司 High-toughness medical non-woven fabric and preparation method thereof

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Application publication date: 20190705

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