CN111619172A - Metal flexible fiber non-lead shielding material - Google Patents

Metal flexible fiber non-lead shielding material Download PDF

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Publication number
CN111619172A
CN111619172A CN202010495311.5A CN202010495311A CN111619172A CN 111619172 A CN111619172 A CN 111619172A CN 202010495311 A CN202010495311 A CN 202010495311A CN 111619172 A CN111619172 A CN 111619172A
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China
Prior art keywords
layer
fiber
fiber layer
gold
shielding material
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Pending
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CN202010495311.5A
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Chinese (zh)
Inventor
包寅
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Jiangsu Zhongchen Automation Technology Co ltd
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Jiangsu Zhongchen Automation Technology Co ltd
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Priority to CN202010495311.5A priority Critical patent/CN111619172A/en
Publication of CN111619172A publication Critical patent/CN111619172A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/06—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer characterised by a fibrous or filamentary layer mechanically connected, e.g. by needling to another layer, e.g. of fibres, of paper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/025—Electric or magnetic properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B2038/0052—Other operations not otherwise provided for
    • B32B2038/008—Sewing, stitching
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/20—All layers being fibrous or filamentary
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/103—Metal fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/212—Electromagnetic interference shielding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/71—Resistive to light or to UV

Landscapes

  • Laminated Bodies (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)

Abstract

The invention relates to the technical field of shielding material application, and discloses a metal flexible fiber non-lead shielding material which comprises a first outer textile layer, wherein a composite shielding layer is sewn at the bottom of the first outer textile layer, the composite shielding layer sequentially comprises a silver fiber layer, a tungsten fiber layer, a copper fiber layer and a gold fiber layer from top to bottom, the silver fiber layer is sewn at the bottom, the tungsten fiber layer is sewn at the bottom of the silver fiber layer, the copper fiber layer is sewn at the bottom of the tungsten fiber layer, the gold fiber layer is sewn at the bottom of the copper fiber layer, and a second outer textile layer is sewn at the bottom of the gold fiber layer. The metal flexible fiber non-lead shielding material is simple in overall structure, convenient to shield and protect equipment and a human body, excellent in safety and simple in preparation method, and accordingly the problems that burden and harm are caused to the equipment and the human body due to the fact that the metal shielding material is large in weight and contains lead and other harmful substances, and the metal flexible fiber non-lead shielding material is inconvenient to take are solved.

Description

Metal flexible fiber non-lead shielding material
Technical Field
The invention relates to the technical field of shielding material application, in particular to a metal flexible fiber non-lead shielding material.
Background
The shielding technology is to shield radioactive rays and radiation by utilizing the good absorption and reflection capability of metal materials for the radioactive rays and the radiation, and the metal shielding materials of the shielding technology are widely applied at present.
In a shielding material (such as lead clothes) applied to a human body and a shielding material (such as shielding cloth) applied to equipment for shielding and protecting in the medical industry, lead is generally contained in the prepared content, and the weight of the shielding material is generally heavier, so that the shielding material can cause injury and weight burden to the human body when being applied to the human body, and can cause burden to the equipment when being applied to the equipment, and the shielding material is troublesome due to the weight when needing to be taken, so that the social requirement is difficult to meet, and therefore, the metal flexible fiber non-lead shielding material is provided to solve the problems.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides the metal flexible fiber non-lead shielding material which has the advantages of moderate weight, good safety and the like, and solves the problems that the metal shielding material has heavy weight and contains harmful substances such as lead and the like, so that the burden and the harm to equipment and a human body are caused, and the metal shielding material is inconvenient to take.
(II) technical scheme
In order to achieve the purposes of moderate weight and good safety, the invention provides the following technical scheme: the utility model provides a flexible fibre of metal non-lead shielding material, includes first outer weaving layer, the composite shielding layer has been sewed up to the bottom on first outer weaving layer, composite shielding layer from the top down comprises silver fiber layer, tungsten fiber layer, copper fiber layer and gold fiber layer in proper order, the bottom sewed up silver fiber layer, tungsten fiber layer has been sewed up to the bottom on silver fiber layer, copper fiber layer has been sewed up to the bottom on tungsten fiber layer, gold fiber layer has been sewed up to the bottom on copper fiber layer, the second outer weaving layer has been sewed up to the bottom on gold fiber layer.
Preferably, the first outer textile layer and the second outer textile layer are both soft fiber layers with the same shape and the same diameter.
Preferably, the corners of the first and second outer textile layers are sewn to each other, and the diameter of the first and second outer textile layers is larger than that of the silver fiber layer.
Preferably, the silver fiber layer is a silver fiber fabric layer, and the tungsten fiber layer is a tungsten fiber fabric layer, which are mutually sewn and fixed until the shape and the diameter are equal.
Preferably, the copper fiber layer is a copper fiber fabric layer, the gold fiber layer is a gold fiber fabric layer, the copper fiber layer and the gold fiber layer are mutually sewn and fixed, and the copper fiber layer and the tungsten fiber layer are mutually sewn.
Preferably, the silver fiber layer, the tungsten fiber layer, the copper fiber layer and the gold fiber layer form a metal shielding layer, wherein the silver fiber content accounts for 12% -16%, the tungsten fiber content accounts for 50% -58%, the copper fiber content accounts for 15% -20%, and the gold fiber content accounts for 8% -10%.
A preparation method of a metal flexible fiber non-lead shielding material comprises the following steps:
1) preparing the silver fiber layer, the tungsten fiber layer, the copper fiber layer and the gold fiber layer into a fabric-shaped body according to the same shape and proportion according to the molding size of the material, then sequentially sewing the silver fiber layer, the tungsten fiber layer, the copper fiber layer and the gold fiber layer from top to bottom to obtain a metal shielding layer after sewing, and then sterilizing the metal shielding layer for 1-2 h;
2) uniformly covering two layers of soft protective cloth on the outer surface of the metal shielding layer obtained in the step 1), sewing corners of the soft protective cloth together to obtain a composite shielding layer after sewing, and performing disinfection treatment on the composite shielding layer after the composite shielding layer is obtained, wherein the disinfection treatment time is 1-2 h;
3) respectively covering the first outer textile layer and the second outer textile layer on the top and the bottom of the composite shielding layer obtained in the step 2), then mutually sewing the corners of the first outer textile layer and the second outer textile layer, and obtaining the metal flexible fiber non-lead shielding material after sewing.
(III) advantageous effects
Compared with the prior art, the invention provides a metal flexible fiber non-lead shielding material, which has the following beneficial effects:
1. this flexible metal fiber non-lead shielding material, through with silver fiber layer, tungsten fiber layer, obtain the metal shielding layer after copper fiber layer and gold fiber layer sew up according to same shape and proportion, and the binding face of metal shielding layer is sewed up, evenly cover two-layer soft protection cloth with the metal shielding layer surface after sewing up, and sew up the edge of soft protection cloth each other, thereby it obtains this material to sew up the edge on first outer weaving layer and second outer weaving layer in its outside at last, this material body weight is moderate, and cover all very simple behind human body and the equipment, the effect that weight is moderate has been reached, through the whole weight of this flexible metal fiber non-lead shielding material moderate, and the preparation process is very simple and convenient, can make this material practicality good be convenient for promote and use.
2. This non-lead shielding material of metal flexible fiber, from the top down by silver fibrous layer in proper order through compound shielding layer, the tungsten fibrous layer, copper fibrous layer and gold fibrous layer are constituteed, the material of metal shielding department is nontoxic harmless, and it possesses superior shielding capacity, consequently can not cause harm to its health when human wearing, and then make this non-lead shielding material of metal flexible fiber security and travelling comfort good, disinfect at the in-process of preparation through this non-lead shielding material of metal flexible fiber, can effectively strengthen its preparation security, thereby effectual solved lead to causing burden and harm to equipment and human body because of metal shielding material weight is great and contain harmful substance such as lead, and the problem of being not convenient for to take.
Drawings
Fig. 1 is a schematic structural diagram of a metal flexible fiber non-lead shielding material according to the present invention;
fig. 2 is a schematic cross-sectional view of a metal flexible fiber non-lead shielding material according to the present invention.
In the figure: 1 a first outer textile layer, 2 a composite shielding layer, 21 a silver fiber layer, 22 a tungsten fiber layer, 23 a copper fiber layer, 24 a gold fiber layer, and 3 a second outer textile layer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, a metal flexible fiber non-lead shielding material comprises a first outer textile layer, a composite shielding layer sewn at the bottom of the first outer textile layer, the composite shielding layer sequentially comprising a silver fiber layer, a tungsten fiber layer, a copper fiber layer and a gold fiber layer from top to bottom, the silver fiber layer sewn at the bottom of the silver fiber layer, the tungsten fiber layer sewn at the bottom of the silver fiber layer, the silver fiber layer is a silver fiber fabric layer, the tungsten fiber layer is a tungsten fiber fabric layer, the tungsten fiber layer and the tungsten fiber layer are sewn and fixed to each other and have the same shape and diameter, the copper fiber layer is sewn at the bottom of the tungsten fiber layer, the gold fiber layer is sewn at the bottom of the copper fiber layer, the copper fiber layer is a copper fiber fabric layer, the gold fiber layer is a gold fiber fabric layer, the gold fiber layer and the gold fiber layer are sewn and fixed to each other, the copper fiber layer and the tungsten fiber layer are sewn to each other, the silver fiber, the silver fiber content accounts for 12% -16%, the tungsten fiber content accounts for 50% -58%, the copper fiber content accounts for 15% -20%, the gold fiber content accounts for 8% -10%, the second outer textile layer is sewn at the bottom of the gold fiber layer, the first outer textile layer and the second outer textile layer are both soft fiber layers which are identical in appearance and diameter, corners of the first outer textile layer and the second outer textile layer are sewn with each other, and the diameter of the first outer textile layer and the diameter of the second outer textile layer are larger than the diameter of the silver fiber layer.
A preparation method of a metal flexible fiber non-lead shielding material comprises the following steps:
1) preparing the silver fiber layer, the tungsten fiber layer, the copper fiber layer and the gold fiber layer into a fabric-shaped body according to the same shape and proportion according to the molding size of the material, then sequentially sewing the silver fiber layer, the tungsten fiber layer, the copper fiber layer and the gold fiber layer from top to bottom to obtain a metal shielding layer after sewing, and then sterilizing the metal shielding layer for 1-2 h;
2) uniformly covering two layers of soft protective cloth on the outer surface of the metal shielding layer obtained in the step 1), sewing corners of the soft protective cloth together to obtain a composite shielding layer after sewing, and performing disinfection treatment on the composite shielding layer after the composite shielding layer is obtained, wherein the disinfection treatment time is 1-2 h;
3) respectively covering the first outer textile layer and the second outer textile layer on the top and the bottom of the composite shielding layer obtained in the step 2), then mutually sewing the corners of the first outer textile layer and the second outer textile layer, and obtaining the metal flexible fiber non-lead shielding material after sewing.
Has the advantages that: the metal flexible fiber non-lead shielding material is obtained by sewing the silver fiber layer 21, the tungsten fiber layer 22, the copper fiber layer 23 and the gold fiber layer 24 according to the same shape and proportion to obtain a metal shielding layer, sewing the binding surface of the metal shielding layer, uniformly covering two layers of soft protective cloth on the outer surface of the metal shielding layer after sewing, sewing the corners of the soft protective cloth, and finally sewing the corners of the first outer textile layer 1 and the second outer textile layer 3 outside the metal shielding layer to obtain the material, wherein the material body has moderate weight, is very simple after covering human bodies and equipment, achieves the effect of moderate weight, has the advantages of overall weight of the metal flexible fiber non-lead shielding material, simple and convenient preparation process, good practicability, convenient popularization and use, and the metal flexible fiber non-lead shielding material, through compound shielding layer 2 from the top down by silver fibrous layer 21 in proper order, tungsten fibrous layer 22, copper fibrous layer 23 and gold fibrous layer 24 constitute, the material of metallic shield department is nontoxic harmless, and it possesses superior shielding capacity, consequently can not cause harm to its health when the human body is dressed, and then make this flexible fiber of metal non-lead shielding material security and travelling comfort good, disinfect at the in-process of preparation through this flexible fiber of metal non-lead shielding material, can effectively strengthen its preparation security, thereby effectual solved because of the metallic shield material weight is great and contain harmful substance such as lead and lead to causing burden and harm to equipment and human body, and the problem of not being convenient for take.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the use of the phrase "comprising a. -. said" to define an element does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (7)

1. A metallic flexible fibre non-lead shielding material comprising a first outer textile layer (1), characterized in that: the bottom of first outer weaving layer (1) is sewed up and is had composite shield layer (2), composite shield layer (2) from the top down comprises silver fiber layer (21), tungsten fiber layer (22), copper fiber layer (23) and gold fiber layer (24) in proper order, the bottom sewed up silver fiber layer (21), tungsten fiber layer (22) have been sewed up to the bottom of silver fiber layer (21), copper fiber layer (23) have been sewed up to the bottom of tungsten fiber layer (22), gold fiber layer (24) have been sewed up to the bottom of copper fiber layer (23), second outer weaving layer (3) have been sewed up to the bottom of gold fiber layer (24).
2. The metallic flexible fiber non-lead shielding material as set forth in claim 1, wherein: the first outer textile layer (1) and the second outer textile layer (3) are both soft fiber layers with the same shape and the same diameter.
3. The metallic flexible fiber non-lead shielding material as set forth in claim 1, wherein: the corners of the first outer textile layer (1) and the second outer textile layer (3) are sewn with each other, and the diameter of the first outer textile layer (1) and the second outer textile layer (3) is larger than that of the silver fiber layer (21).
4. The metallic flexible fiber non-lead shielding material as set forth in claim 1, wherein: the silver fiber layer (21) is a silver fiber fabric layer, and the tungsten fiber layer (22) is a tungsten fiber fabric layer, which are mutually sewn and fixed until the shape and the diameter are equal.
5. The metallic flexible fiber non-lead shielding material as set forth in claim 1, wherein: the copper fiber layer (23) is a copper fiber fabric layer, the gold fiber layer (24) is a gold fiber fabric layer, the gold fiber layer and the gold fiber layer are mutually sewn and fixed, and the copper fiber layer (23) and the tungsten fiber layer (22) are mutually sewn.
6. The metallic flexible fiber non-lead shielding material as set forth in claim 1, wherein: the silver fiber layer (21), the tungsten fiber layer (22), the copper fiber layer (23) and the gold fiber layer (24) form a metal shielding layer, wherein the silver fiber content accounts for 12% -16%, the tungsten fiber content accounts for 50% -58%, the copper fiber content accounts for 15% -20%, and the gold fiber content accounts for 8% -10%.
7. A preparation method of a metal flexible fiber non-lead shielding material is characterized by comprising the following steps:
1) preparing a silver fiber layer (21), a tungsten fiber layer (22), a copper fiber layer (23) and a gold fiber layer (24) into a fabric-shaped body according to the same shape and proportion according to the molding size of the material, then sequentially sewing the fabric-shaped body from top to bottom to obtain a metal shielding layer after sewing, and then sterilizing the metal shielding layer after obtaining the metal shielding layer, wherein the time of the sterilization is 1-2 hours;
2) uniformly covering two layers of soft protective cloth on the outer surface of the metal shielding layer obtained in the step 1), sewing corners of the soft protective cloth together to obtain a composite shielding layer (2), and sterilizing the composite shielding layer (2) after the composite shielding layer (2) is obtained, wherein the time of the sterilization is 1-2 h;
3) respectively covering the first outer textile layer (1) and the second outer textile layer (3) to the top and the bottom of the composite shielding layer (2) obtained in the step 2), then mutually sewing the corners of the first outer textile layer (1) and the second outer textile layer (3), and obtaining the metal flexible fiber non-lead shielding material after sewing.
CN202010495311.5A 2020-06-03 2020-06-03 Metal flexible fiber non-lead shielding material Pending CN111619172A (en)

Priority Applications (1)

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CN202010495311.5A CN111619172A (en) 2020-06-03 2020-06-03 Metal flexible fiber non-lead shielding material

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Application Number Priority Date Filing Date Title
CN202010495311.5A CN111619172A (en) 2020-06-03 2020-06-03 Metal flexible fiber non-lead shielding material

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CN111619172A true CN111619172A (en) 2020-09-04

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107348581A (en) * 2017-07-26 2017-11-17 江苏工程职业技术学院 A kind of preparation method of novel radiation-proof fabric

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107348581A (en) * 2017-07-26 2017-11-17 江苏工程职业技术学院 A kind of preparation method of novel radiation-proof fabric

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Application publication date: 20200904