CN112388936B - Manufacturing process of single-core mask wire - Google Patents
Manufacturing process of single-core mask wire Download PDFInfo
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- CN112388936B CN112388936B CN202011157673.XA CN202011157673A CN112388936B CN 112388936 B CN112388936 B CN 112388936B CN 202011157673 A CN202011157673 A CN 202011157673A CN 112388936 B CN112388936 B CN 112388936B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 31
- 238000001125 extrusion Methods 0.000 claims abstract description 67
- 229910052751 metal Inorganic materials 0.000 claims description 24
- 239000002184 metal Substances 0.000 claims description 24
- 239000011810 insulating material Substances 0.000 claims description 22
- -1 polyethylene Polymers 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 15
- 239000004698 Polyethylene Substances 0.000 claims description 11
- 229920000573 polyethylene Polymers 0.000 claims description 11
- 239000004743 Polypropylene Substances 0.000 claims description 10
- 229920001155 polypropylene Polymers 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 239000002994 raw material Substances 0.000 description 16
- 230000008569 process Effects 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 7
- 230000007547 defect Effects 0.000 description 4
- 239000004744 fabric Substances 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 229920005672 polyolefin resin Polymers 0.000 description 3
- 230000002633 protecting effect Effects 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000005253 cladding Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 239000004745 nonwoven fabric Substances 0.000 description 2
- 238000004659 sterilization and disinfection Methods 0.000 description 2
- 208000035473 Communicable disease Diseases 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 241000700605 Viruses Species 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 244000052616 bacterial pathogen Species 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000001815 facial effect Effects 0.000 description 1
- 206010022000 influenza Diseases 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000013500 performance material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000009958 sewing Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
- B29C48/154—Coating solid articles, i.e. non-hollow articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a manufacturing process of a single-core mask line in the field of mask nose clip lines, which improves an extrusion die through design and adopts a convex edge structure, improves the extrusion performance, ensures that the surface of the single-core mask nose clip line is smooth and flat without burrs after extrusion molding, greatly improves the production efficiency, and effectively solves the problems of low production speed and limited production efficiency of the mask nose clip line in the prior art due to structural reasons.
Description
Technical Field
The invention relates to the field of mask nose clip wire manufacturing, in particular to a single-core mask wire manufacturing process.
Background
The mask is a hygienic product used for filtering air entering the mouth and the nose, can effectively filter harmful germs, dust, particles and the like in the air, is commonly used in hospitals, factories and other places, and is increasingly applied to daily trips of people along with the increase of urban air haze and the outbreak of partial airborne virus epidemic. The filtering and protecting effect of the mask mainly depends on the filtering capacity of the material of the mask, and the attaching effect of the mask attached to the face is very important. In order to ensure that the mask can be better attached to the outline of the human face, mask lines, also called nose bridge strips, nose clip lines and the like are arranged on the existing mask and used for attaching the mask to the human face.
The mask thread is mainly made of metal thin sheets or polyolefin resin with strong plasticity, the metal thin sheets are mostly aluminum sheets and are mainly used for thick masks, and the polyolefin resin mask thread is mainly used for thin medical disposable masks. In order to ensure the shaping performance of the mask thread made of polyolefin resin, a thin metal wire is mostly embedded in the mask thread, and the mask thread is formed by extruding and coating resin on the outer side of the metal wire in the production process. However, the efficiency of such mask line extrusion molding production in the prior art is low, mainly because the mask line is to be used for masks with light and thin materials, the thickness of the mask line is limited, usually 1-2mm, and the smooth surface is required to ensure that the mask is flat and usable without being hung on mask main bodies such as non-woven fabrics, melt-blown fabrics and the like when being assembled on the mask. In order to meet the requirements, the extrusion speed of the mask nasal splint line with the existing structure cannot exceed 120 m/min in the extrusion molding process, once the extrusion speed exceeds the critical point, the surface of the mask line after extrusion molding inevitably has a galling phenomenon, and the mask filter cloth is inevitably hung on the surface of the galling mask line in the process of sewing the mask, so that the assembled mask is wrinkled, and the effective filtering and protecting effect cannot be provided. Therefore, the production efficiency of the mask line is limited, and particularly, the production supply of the masks is seriously influenced when the mask requirements for influenza, infectious diseases and the like are large.
Disclosure of Invention
The invention aims to provide a manufacturing process of a single-core mask wire, and aims to solve the problems that in the prior art, a mask nose clip wire is low in production speed and limited in production efficiency due to structural reasons.
In order to achieve the purpose, the basic technical scheme of the invention is as follows: the manufacturing process of the single-core mask wire comprises the following steps:
A. preparing materials, namely preparing a metal core wire and an insulating material;
B. opening the die, preparing an extrusion die, wherein a discharge hole is formed in the extrusion die and comprises a rectangular hole, the left end and the right end of the rectangular hole are both communicated with a round hole, the diameters of the two round holes are both larger than the distance between the upper wall and the lower wall of the rectangular hole, and the middle part of the upper wall of the rectangular hole is upwards sunken to form a semicircular through groove;
C. extruding, namely assembling an extrusion die on a screw extruder, heating the screw extruder and the extrusion die, and synchronously extruding the metal core wire and the insulating material through the extrusion die on the screw extruder;
D. and (5) cooling and forming, namely cooling the extruded single-core mask line to room temperature by water.
The principle and the advantages of the scheme are as follows: during the practical application, extrusion tooling installs on screw extruder, and the raw materials is carried to extrusion tooling department extrusion moulding through screw extruder heating, and the raw materials is from extrusion tooling's discharge gate extrusion moulding, and the round hole at discharge gate both ends makes the raw materials extrusion in-process in the trafficability characteristic improvement at the discharge gate edge, ensures that the raw materials smoothly extrudes from the discharge gate, and the surface can not produce the phenomenon of galling. Compared with an extrusion die in the prior art, the round hole has the advantages that the passing space of two sides of the discharge port is enlarged, the plane contact of the edge part is reduced, the plane dragging in the raw material extrusion process is reduced through the arc surface, raw materials are effectively prevented from being napped to generate burrs, and the napping defect of the surface of the extruded mask line is avoided. And adopt such structure to improve raw materials trafficability characteristic for the extrusion moulding speed of gauze mask line can improve more than 60% on current basis, and production efficiency improves by a wide margin. Form the fin through semi-circular logical groove on extrusion moulding's gauze mask nose presss from both sides the line, can carry out the cladding to the metal core line, also can be convenient discernment gauze mask in the gauze mask use just, the reverse side to can improve the design performance of gauze mask line, can effectively laminate the gauze mask at human face in the guarantee use.
Further, the insulating material in the step A comprises 70% -90% of polyethylene and 10% -30% of polypropylene. The insulating material formed by mixing polyethylene and polypropylene in the proportion is preferably adopted, so that the extrusion-molded mask nasal splint line has excellent bending resistance and flexibility and good heat-resistant and low-temperature-resistant performances, can withstand repeated bending without being whitened at a bent part, and can meet various requirements for disinfection and sterilization.
Further, the insulating material in step a comprises 80% polyethylene and 20% polypropylene. The insulating material with the proportion is preferably adopted, so that the optimal mechanical property can be obtained, and the excellent mechanical property of the produced mask nose clip line can be effectively ensured.
And further, processing the two round holes into the same diameter in the step B. As the optimization, the passing spaces at the two ends of the discharge port are the same, the raw materials flow more uniformly in the process of passing through the discharge port, the flowability is better, the two side edges of the extrusion-molded mask line are further ensured not to have the galling defect, and the applicability of the mask line assembled with the mask can also be improved.
And further, in the step B, the intersected chord length of each round hole and each rectangular hole is processed to be equal to the distance between the upper wall and the lower wall of each rectangular hole. The transition position of the round hole and the rectangular hole is relatively smooth, the surface of the extrusion-molded mask line cannot be sunken or drawn, and the molding quality is better.
And further, in the step B, the circle centers of the two round holes are positioned on the vertical symmetry axis of the rectangular hole. Preferably, the two round holes are symmetrically arranged with the vertical symmetry axis, the space of the round holes protruding out of the upper wall and the lower wall of the rectangular hole is the same in size, and raw materials flow more smoothly in the extrusion process.
And further, in the step B, the circle center of the semicircular through groove is positioned on the transverse symmetry axis of the rectangular hole. Guarantee like this that the discharge gate is whole to possess symmetrical structure as preferring, extrusion moulding's gauze mask line quality is better.
And further, in the step B, the metal core wire and the semicircular through groove of the extrusion die are coaxially arranged. As the peripheral cladding of metal sinle silk has the even insulating material of thickness in the fashioned gauze mask nose clip line like this of preferred, the metal sinle silk can provide reliable and stable setting performance, and insulating material can effectively keep apart the metal sinle silk.
Further, in the step C, the whole formed by the screw extruder and the extrusion die is heated in six sections, wherein the temperature of the first section is 150 ℃, the temperature of the second section is 160 ℃, the temperature of the third section is 170 ℃, the temperature of the neck section is 180 ℃, the temperature of the die body section is 190 ℃, and the temperature of the die section is 190 ℃. Preferably, the temperature is gradually increased by adopting a six-section heating mode, the insulating material entering the screw extruder is gradually increased and heated by three-section temperature increase, then the machine neck and the die body are further increased in temperature, the insulating material is further melted and mixed, the fluidity is improved, isothermal extrusion is performed at the die part, the insulating material keeps stable and excellent fluidity in the extrusion process, the insulating material can be smoothly extruded in the extrusion process without the defects of edge galling, rough edges, burrs and the like, and the insulating material can be stably coated on the outer side of the metal core wire.
Further, the extrusion speed in step C was 120-200 m/min. The extrusion speed can be further improved after the extrusion die and the process are preferably improved, the extrusion efficiency can be improved by more than 60 percent compared with the prior art, and the production efficiency of the single-core mask line is greatly improved.
Drawings
FIG. 1 is a front view of an extrusion die in example 1 of the present invention;
fig. 2 is a schematic cross-sectional structure diagram of a single core mask thread produced by adopting the technical scheme of the invention.
Detailed Description
The following is further detailed by way of specific embodiments:
reference numerals in the drawings of the specification include: the extrusion die comprises an extrusion die 1, rectangular holes 2, round holes 3, semicircular through grooves 4, a sheath 5, convex ribs 6 and metal wires 7.
Example 1, a process for manufacturing a single core mask wire, comprising the steps of:
A. preparing materials, namely preparing a metal core wire and an insulating material, wherein the metal core wire is a steel wire with the diameter smaller than 0.5mm, and the insulating material consists of polyethylene with the mass fraction of 80% and polypropylene with the mass fraction of 20%;
B. opening the die, preparing an extrusion die 1, as shown in fig. 1, arranging a discharge port on the extrusion die 1, wherein the discharge port comprises a rectangular hole 2, the left and right ends of the rectangular hole 2 are both communicated with a round hole 3, the diameters of the two round holes 3 are both larger than the distance between the upper wall and the lower wall of the rectangular hole 2, the two round holes 3 are processed into the same diameter, the circle centers of the two round holes 3 are both positioned on the vertical symmetry axis of the rectangular hole 2, and the chord length of each round hole 3 intersected with the rectangular hole 2 is processed into the distance equal to the distance between the upper wall and the lower wall of the rectangular hole 2; the middle part of the upper wall of the rectangular hole 2 is upwards sunken to form a semicircular through groove 4, the circle center of the semicircular through groove 4 is positioned on the transverse symmetrical axis of the rectangular hole 2, and the metal core wire and the semicircular through groove 4 of the extrusion die 1 are coaxially arranged;
C. extruding, namely assembling an extrusion die 1 on a screw extruder, heating the screw extruder and the extrusion die 1, heating the whole formed by the screw extruder and the extrusion die 1 in six sections, wherein the temperature of the first section is 150 ℃, the temperature of the second section is 160 ℃, the temperature of the third section is 170 ℃, the temperature of a machine neck section is 180 ℃, the temperature of a die body section is 190 ℃, and the temperature of the die section is 190 ℃, and synchronously extruding the metal core wire and the insulating material through the extrusion die 1 on the screw extruder at the extrusion speed of 200 m/min;
D. and (4) cooling and forming, namely cooling the extruded single-core mask line to room temperature.
Example 2, the insulation material in this example consisted of 70% by mass of polyethylene and 30% by mass of polypropylene, with an extrusion speed of 160 m/min.
Example 3 in this example the insulation material consists of 90% by mass of polyethylene and 10% by mass of polypropylene and the extrusion speed is 120 m/min.
Comparative example 1, the insulating material used in this example was 60% by weight polyethylene and 40% by weight polypropylene.
Comparative example 2, the insulating material used in this example was composed of 95% by weight of polyethylene and 5% by weight of polypropylene.
The production process is characterized in that the extrusion die 1 and a screw extruder are assembled, resin raw materials such as polyethylene and the like are fed into the screw extruder, the heated raw materials are pushed to the extrusion die 1 by the screw, and the raw materials are extruded and molded through a discharge hole in the extrusion die 1. The in-process of raw materials process the discharge gate, because discharge gate both sides end adopts 3 structures of outside sunken round hole, the friction influence that the circular arc curved surface caused is less than the plane friction influence at middle part, and raw materials trafficability characteristic is better for the raw materials is even synchronous extrudes from the discharge gate, and extrusion moulding's product surface is smooth and level and does not have deckle edge, can not take place to hang the condition of dragging the non-woven fabrics, melt-blown cloth at the in-process of wearing to establish the gauze mask filter cloth. Extrusion quality is guaranteed, extrusion speed can be further improved, a large amount of galling defects can be generated when the extrusion speed exceeds 120 m/min originally, extrusion speed can be improved to 200 m/min after improvement, galling can not occur, and production quality and production efficiency are greatly improved.
Still can carry the wire 7 in extrusion tooling 1 in step in the extrusion process for wire 7 buries underground in extrusion moulding's resin raw materials, can improve the structural strength and the crooked design performance of extrusion moulding product, makes fashioned gauze mask line product can effectively be with gauze mask and human facial contour laminating, realizes effectively protecting.
Comparing the nose clip line of the single-core mask obtained by processing the comparative example 1 and the comparative example 2 with the nose clip line of the single-core mask obtained by processing the comparative example 1 and the nose clip line obtained by processing the single-core mask obtained by processing the comparative example 2 with the products obtained by the examples 1 to 3, the nose clip line of the single-core mask is harder in texture and easy to cause white fatigue at the bent part, and the quality of the nose clip line of the single-core mask obtained by processing the comparative example 2 is better than that of the products obtained by processing the examples 1 to 3, the surface of the single-core mask is easy to wear, the metal wires are easy to wear out, and the quality of the products produced by adopting the technical schemes of the examples 1 to 3 is better in combination.
The single-core mask line formed by adopting the technical scheme of the invention is shown in figure 2. The wire sheath comprises a sheath 5, two side edges of the sheath 5 are in a circular strip shape protruding outwards, a metal wire 7 is embedded in the sheath 5 along the length direction, and the diameter of the metal wire 7 is smaller than or equal to 0.5 mm. The middle part of the upper surface of the sheath 5 is provided with a convex rib 6 extending along the length direction, the cross section of the convex rib 6 is semicircular, and the metal wire 7 and the convex rib 6 are coaxially arranged.
The foregoing is merely an example of the present invention and common general knowledge in the art of specific structures and/or features of the invention has not been set forth herein in any way. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several variations and modifications can be made, which should also be considered as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the utility of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (9)
1. Single core gauze mask line manufacturing process, its characterized in that: the method comprises the following steps:
A. preparing materials, namely preparing a metal core wire and an insulating material;
B. opening the die, preparing an extrusion die, wherein a discharge port is arranged on the extrusion die, the discharge port comprises a rectangular hole, the left end and the right end of the rectangular hole are both communicated with a round hole, the diameter of each round hole is larger than the distance between the upper wall and the lower wall of the rectangular hole, and the middle part of the upper wall of the rectangular hole is upwards sunken to form a semicircular through groove;
C. extruding, namely assembling an extrusion die on a screw extruder, heating the screw extruder and the extrusion die, and synchronously extruding the metal core wire and the insulating material through the extrusion die on the screw extruder at the extrusion speed of 120-200 m/min;
D. and (4) cooling and forming, namely cooling the extruded single-core mask line to room temperature.
2. A manufacturing process of a single core mask wire according to claim 1, characterized in that: the insulating material in the step A comprises 70% -90% of polyethylene and 10% -30% of polypropylene.
3. The manufacturing process of a single core mask thread according to claim 2, characterized in that: the insulating material in the step A comprises 80% of polyethylene and 20% of polypropylene.
4. A manufacturing process of a single core mask wire according to claim 1, characterized in that: and in the step B, processing the two round holes into the same diameter.
5. The manufacturing process of a single core mask thread according to claim 1, characterized in that: and in the step B, the intersected chord length of each round hole and each rectangular hole is processed to be equal to the distance between the upper wall and the lower wall of each rectangular hole.
6. The manufacturing process of a single core mask thread according to claim 1, characterized in that: and B, positioning the circle centers of the two circular holes on the vertical symmetry axis of the rectangular hole.
7. A manufacturing process of a single core mask wire according to claim 1, characterized in that: and in the step B, the circle center of the semicircular through groove is positioned on the transverse symmetrical axis of the rectangular hole.
8. The manufacturing process of a single core mask thread according to claim 7, wherein: and in the step B, the metal core wire and the semicircular through groove of the extrusion die are coaxially arranged.
9. The manufacturing process of a single core mask thread according to claim 8, wherein: in the step C, the whole formed by the screw extruder and the extrusion die is heated in six sections, wherein the temperature of the first section is 150 ℃, the temperature of the second section is 160 ℃, the temperature of the third section is 170 ℃, the temperature of the neck section is 180 ℃, the temperature of the die body section is 190 ℃ and the temperature of the die section is 190 ℃.
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| CN202011157673.XA CN112388936B (en) | 2020-10-26 | 2020-10-26 | Manufacturing process of single-core mask wire |
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| CN202011157673.XA CN112388936B (en) | 2020-10-26 | 2020-10-26 | Manufacturing process of single-core mask wire |
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| CN112388936B true CN112388936B (en) | 2022-09-27 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103858181A (en) * | 2011-04-12 | 2014-06-11 | 提克纳有限责任公司 | Composite core for electrical transmission cables |
| JP2016189459A (en) * | 2015-03-27 | 2016-11-04 | 住友電気工業株式会社 | Wiring material for coil, electric wire for coil, and method of manufacturing electric wire for coil |
| CN110482018A (en) * | 2019-07-26 | 2019-11-22 | 邰国芳 | A kind of band and its production technology |
| CN111703086A (en) * | 2020-06-23 | 2020-09-25 | 安徽元琛环保科技股份有限公司 | Preparation method of all-plastic mask nose bridge strip and all-plastic mask nose bridge strip prepared by same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH111263A (en) * | 1997-06-13 | 1999-01-06 | Kyowa:Kk | Twist tie |
| US20090020126A1 (en) * | 2007-07-17 | 2009-01-22 | Gregory Yuen Fun Lau | Attachment of a bridge band to an oxygen mask |
| RU2497671C2 (en) * | 2007-09-10 | 2013-11-10 | ИЭйчСи Канада, Инк. | Method and device for extrusion of guard rails from thermoplastics |
| CN205757365U (en) * | 2016-05-19 | 2016-12-07 | 陆远鹏 | A kind of band protection glass and the mask of simple outlet valve |
| CN207285285U (en) * | 2017-09-06 | 2018-05-01 | 九江艺锦诚医疗器械有限公司 | A kind of multi-functional Antifogging mask |
| KR102157462B1 (en) * | 2020-03-23 | 2020-09-17 | 엄성길 | Disposable face mask having detatchable nose wire |
| CN111358073A (en) * | 2020-03-27 | 2020-07-03 | 三门县森波户外用品股份有限公司 | High-sealing mask |
| CN111571921A (en) * | 2020-05-26 | 2020-08-25 | 丹阳市伟鹤祥线缆制造有限公司 | Manufacturing process of nose bridge strip |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103858181A (en) * | 2011-04-12 | 2014-06-11 | 提克纳有限责任公司 | Composite core for electrical transmission cables |
| JP2016189459A (en) * | 2015-03-27 | 2016-11-04 | 住友電気工業株式会社 | Wiring material for coil, electric wire for coil, and method of manufacturing electric wire for coil |
| CN110482018A (en) * | 2019-07-26 | 2019-11-22 | 邰国芳 | A kind of band and its production technology |
| CN111703086A (en) * | 2020-06-23 | 2020-09-25 | 安徽元琛环保科技股份有限公司 | Preparation method of all-plastic mask nose bridge strip and all-plastic mask nose bridge strip prepared by same |
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