CN105150895A - Headrest rod surface treatment method - Google Patents
Headrest rod surface treatment method Download PDFInfo
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- CN105150895A CN105150895A CN201510631027.5A CN201510631027A CN105150895A CN 105150895 A CN105150895 A CN 105150895A CN 201510631027 A CN201510631027 A CN 201510631027A CN 105150895 A CN105150895 A CN 105150895A
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- CN
- China
- Prior art keywords
- head rest
- rest pole
- pole surface
- treatment method
- surface treatment
- Prior art date
- 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
Links
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000004381 surface treatment Methods 0.000 title claims abstract description 25
- 239000000843 powder Substances 0.000 claims abstract description 43
- 239000004033 plastic Substances 0.000 claims abstract description 31
- 238000005422 blasting Methods 0.000 claims abstract description 28
- 239000002245 particle Substances 0.000 claims abstract description 13
- 229920001169 thermoplastic Polymers 0.000 claims abstract description 9
- 229920001187 thermosetting polymer Polymers 0.000 claims abstract description 9
- 239000000853 adhesive Substances 0.000 claims abstract description 8
- 230000001070 adhesive effect Effects 0.000 claims abstract description 8
- 239000012752 auxiliary agent Substances 0.000 claims description 14
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 12
- ISAOCJYIOMOJEB-UHFFFAOYSA-N benzoin Chemical compound C=1C=CC=CC=1C(O)C(=O)C1=CC=CC=C1 ISAOCJYIOMOJEB-UHFFFAOYSA-N 0.000 claims description 12
- 239000003086 colorant Substances 0.000 claims description 10
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 230000003287 optical effect Effects 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 244000028419 Styrax benzoin Species 0.000 claims description 6
- 235000000126 Styrax benzoin Nutrition 0.000 claims description 6
- 235000008411 Sumatra benzointree Nutrition 0.000 claims description 6
- 238000010521 absorption reaction Methods 0.000 claims description 6
- 229960002130 benzoin Drugs 0.000 claims description 6
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 6
- 239000000356 contaminant Substances 0.000 claims description 6
- 235000019382 gum benzoic Nutrition 0.000 claims description 6
- 239000000155 melt Substances 0.000 claims description 6
- 238000007781 pre-processing Methods 0.000 claims description 6
- 238000003672 processing method Methods 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 239000005995 Aluminium silicate Substances 0.000 claims description 4
- 235000012211 aluminium silicate Nutrition 0.000 claims description 4
- 239000003822 epoxy resin Substances 0.000 claims description 4
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 4
- 229920000647 polyepoxide Polymers 0.000 claims description 4
- 229920000728 polyester Polymers 0.000 claims description 4
- 239000004952 Polyamide Substances 0.000 claims description 3
- 229920002647 polyamide Polymers 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 abstract description 7
- 238000005260 corrosion Methods 0.000 abstract description 7
- 239000011248 coating agent Substances 0.000 abstract description 5
- 238000000576 coating method Methods 0.000 abstract description 5
- 230000032683 aging Effects 0.000 abstract description 3
- 238000011282 treatment Methods 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 238000005286 illumination Methods 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract description 2
- 238000005507 spraying Methods 0.000 abstract 2
- 238000007788 roughening Methods 0.000 abstract 1
- 239000007921 spray Substances 0.000 abstract 1
- 238000007747 plating Methods 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 239000011651 chromium Substances 0.000 description 3
- 238000001962 electrophoresis Methods 0.000 description 3
- 238000009713 electroplating Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000003595 mist Substances 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229920002292 Nylon 6 Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses a headrest rod surface treatment method. The headrest rod surface treatment method comprises the following steps: (1) pretreatment, to be specific, carrying out shot blasting treatment on the surface of a headrest rod by using a shot-blasting machine, removing oil stains of the surface of the headrest rod, and meanwhile roughening the surface to improve the adhesive force of surface treatment; (2) plastic powder spraying, to be specific, uniformly spraying plastic powder on the surface of the headrest rod by using an electrostatic spray gun, wherein the particle diameter of the plastic powder is 10-30 micrometers, and the plastic powder is thermosetting plastic powder or thermoplastic plastic powder; and (3) carrying out high temperature curing, to be specific, putting the headrest rod in a high-temperature baking furnace, baking for 10-20 minutes at the temperature of 180-220 DEG C so as to burn the adsorbed plastic powder to melt, and then curing to form a surface coating. The headrest rod surface treatment method is simple, energy-saving, low in energy consumption and cost, pollution-free in a treatment process and environmental-friendly. The formed coating has the performances such as corrosion resistance, illumination resistance, impact resistance, chemicals resistance, wear resistance, low friction and noise reduction. Due to adoption of the headrest rod surface treatment method, the durability and circulation requirements on the headrest rod can be satisfied, and the corrosion resistance and ageing resistance of the headrest rod can also be ensured.
Description
Technical field
The invention belongs to auto-parts surface-treated technical field, be specifically related to a kind of head rest pole surface treatment method.
Background technology
Head rest pole is a part for seat system, rests the head on and is arranged on the top of backrest by the head rest pole of its inside.In existing market, that what most of head rest pole adopted is is zinc-plated, the surface treatment of chromium plating or electrophoresis.Chrome-plated surface is wherein bright and clean, and quality is hard, and withstanding corrosion is ageing-resistant, is extraordinary selection.But its manufacturing process is with high pollution and high energy consumption, along with the attention of Environmental protection, to the raising that energy utilization rate requires, such technique is constantly by marginalisation, and its difficulty and cost also constantly rise.And because plating requires higher to blank material, cause producing fraction defective and remain high.Zinc-plated withstanding corrosion, surface better, but not wear-resisting; The cost of electrophoresis is low, but not wear-resisting, micro-anticorrosion.Zinc-plated and electrophoresis due to superficial hardness poor, use the easy scratch in certain number of times rear surface, cause surface bad, also very easily corrosion after simultaneously swiping.In conventional project, the electroplating cost of headrest inserted link accounts for the 40-50% of inserted link total cost.And be high pollution technique owing to electroplating, future cost will inevitably continue to rise.So need the surface treatment of developing a kind of replacing electroplating, while making head rest pole meet key performance requirements, also want environmental protection and low cost.
Summary of the invention
In order to solve, above-mentioned head rest pole is zinc-plated, the technical matters of chromium plating or electrophoretic surface process Shortcomings, the invention provides the head rest pole surface treatment method of a kind of low cost and environmental protection.
The invention provides a kind of head rest pole surface treatment method, this processing method comprises the following steps:
(1) pre-processing: use shot-blasting machine to carry out Shot Blasting to head rest pole surface, head rest pole surface and oil contaminant is removed, makes surperficial roughen simultaneously, improve surface-treated adhesive ability;
(2) plastic-blasting: use electrostatic gun that plastic powders is sprayed on head rest pole surface equably; Wherein the particle diameter of plastic powders is 10-30 μm, and plastic powders is thermoset powders or thermoplastic plastic powder;
(3) hot setting: head rest pole is put into high-temperature baking stove, toasts 10-20min at 180-220 DEG C, the plastic powders of absorption is burnt and melts Post RDBMS, form finish coat.
In step (1), the hard ball that shot-blasting machine use particle diameter is 0.1-0.5mm is as ball blast steel ball, and front and back two-way simultaneous carries out impelling to head rest pole surface.
In step (2), thermosetting plastic comprises the component of following quality proportioning: epoxy resin 30-40%, polyester 30-35%, Charge 20-30%, auxiliary agent 3-8%; Thermoplastic plastic comprises the component of following quality proportioning: polyamide 50-60%, Charge 30-40%, auxiliary agent 3-8%.
Charge is one or more the mixing in blanc fixe, calcium carbonate, kaolin, diatom earth, colorant.
Auxiliary agent is one or more the mixing in optical brightener, benzoin, levelling agent.
In step (2), by head rest pole by hanger ground connection, use electrostatic gun, plastic powders is sprayed by two-way mechanical arm, makes the powder of ejection be sprayed on head rest pole surface equably.
In step (3), the thickness of finish coat is 50-150 μm.
Beneficial effect of the present invention: head rest pole surface treatment method of the present invention is simple, energy-saving and cost-reducing, productive costs is low, pollution-free, environmental protection in treating process; The coating formed has the performance of withstanding corrosion, resistance to illumination, shock resistance, chemicals-resistant, wear-resistant, low friction, noise-reducing; Both ensure that the durable circulation requirement of head rest pole, and its withstanding corrosion, ageing-resistant performance can have been guaranteed again.
Detailed description of the invention
Below in conjunction with embodiment, in detail explanation is explained to the present invention.
Embodiment 1
A kind of head rest pole surface treatment method of the present invention, this processing method comprises the following steps:
(1) pre-processing: use shot-blasting machine to carry out Shot Blasting to head rest pole surface, head rest pole surface and oil contaminant is removed, makes surperficial roughen simultaneously, improve surface-treated adhesive ability; The hard ball that shot-blasting machine use particle diameter is 0.1mm is as ball blast steel ball, and front and back two-way simultaneous carries out impelling to head rest pole surface, makes surperficial roughen simultaneously, improves surface-treated adhesive ability.
(2) plastic-blasting: use electrostatic gun that plastic powders is sprayed on head rest pole surface equably; Wherein the particle diameter of plastic powders is 10 μm, and plastic powders is thermoset powders, and thermosetting plastic comprises the component of following quality proportioning: epoxy resin 30%, polyester 35%, Charge 30%, auxiliary agent 5%; Charge is the mixing of blanc fixe, kaolin, colorant, and the mass ratio of blanc fixe, kaolin, colorant is 2:2:1.Auxiliary agent is the mixing of optical brightener, levelling agent, and the mass ratio of optical brightener, levelling agent is 1:1.
(3) hot setting: head rest pole is put into high-temperature baking stove, toasts 20min at 180 DEG C, the plastic powders of absorption is burnt and melts Post RDBMS, forms the finish coat that thickness is 50 μm.
Embodiment 2
A kind of head rest pole surface treatment method of the present invention, this processing method comprises the following steps:
(1) pre-processing: use shot-blasting machine to carry out Shot Blasting to head rest pole surface, head rest pole surface and oil contaminant is removed, makes surperficial roughen simultaneously, improve surface-treated adhesive ability; The hard ball that shot-blasting machine use particle diameter is 0.4mm is as ball blast steel ball, and front and back two-way simultaneous carries out impelling to head rest pole surface.
(2) plastic-blasting: use electrostatic gun that plastic powders is sprayed on head rest pole surface equably; Wherein the particle diameter of plastic powders is 20 μm, and plastic powders is thermoset powders, and thermosetting plastic comprises the component of following quality proportioning: epoxy resin 40%, polyester 30%, Charge 22%, auxiliary agent 8%; Charge is the mixing of blanc fixe, calcium carbonate, colorant, and the mass ratio of blanc fixe, calcium carbonate, colorant is 3:2:1.Auxiliary agent is the mixing of optical brightener, benzoin, levelling agent, and the mass ratio of optical brightener, benzoin, levelling agent is 1:1:1.
(3) hot setting: head rest pole is put into high-temperature baking stove, toasts 10min at 220 DEG C, the plastic powders of absorption is burnt and melts Post RDBMS, forms the finish coat that thickness is 100 μm.
Embodiment 3
A kind of head rest pole surface treatment method of the present invention, this processing method comprises the following steps:
(1) pre-processing: use shot-blasting machine to carry out Shot Blasting to head rest pole surface, head rest pole surface and oil contaminant is removed, makes surperficial roughen simultaneously, improve surface-treated adhesive ability; The hard ball that shot-blasting machine use particle diameter is 0.5mm is as ball blast steel ball, and front and back two-way simultaneous carries out impelling to head rest pole surface.
(2) plastic-blasting: use electrostatic gun that plastic powders is sprayed on head rest pole surface equably; Wherein the particle diameter of plastic powders is 30 μm, and plastic powders is thermoplastic plastic powder, and thermoplastic plastic comprises the component of following quality proportioning: polyamide 52%, Charge 40%, auxiliary agent 8%.Charge is the mixing of blanc fixe, colorant, and the mass ratio of blanc fixe and colorant is 1:1.Auxiliary agent is the mixing of benzoin, levelling agent, and the mass ratio of benzoin, levelling agent is 1:1.
(3) hot setting: head rest pole is put into high-temperature baking stove, toasts 20min at 180 DEG C, the plastic powders of absorption is burnt and melts Post RDBMS, forms the finish coat that thickness is 80 μm.
Embodiment 4
A kind of head rest pole surface treatment method of the present invention, this processing method comprises the following steps:
(1) pre-processing: use shot-blasting machine to carry out Shot Blasting to head rest pole surface, head rest pole surface and oil contaminant is removed, makes surperficial roughen simultaneously, improve surface-treated adhesive ability; The hard ball that shot-blasting machine use particle diameter is 0.3mm is as ball blast steel ball, and front and back two-way simultaneous carries out impelling to head rest pole surface.
(2) plastic-blasting: use electrostatic gun that plastic powders is sprayed on head rest pole surface equably; Wherein the particle diameter of plastic powders is 20 μm, and plastic powders is thermoplastic plastic powder, and thermoplastic plastic comprises the component of following quality proportioning: polyamide 6 0%, Charge 32%, auxiliary agent 8%.Charge is the mixing of calcium carbonate, colorant, and the mass ratio of calcium carbonate, colorant is 3:1; Auxiliary agent is optical brightener.
(3) hot setting: head rest pole is put into high-temperature baking stove, toasts 10min at 220 DEG C, the plastic powders of absorption is burnt and melts Post RDBMS, forms the finish coat that thickness is 150 μm.
Compare the surface treatments such as conventional chromate, head rest pole surface easily produces the problems such as hydrogen embrittlement, and mechanical characteristics is reduced, and after plastic-blasting, head rest pole mechanical characteristics can not decline.Tradition coating can not bear 100 to 3000 times not etc. in the circulation of headrest up-down adjustment, and after circulation, coating has damage, causes bad order, and decay resistance declines simultaneously, long-term place after easy-to-rust; After plastic-blasting process of the present invention, head rest pole is through high temperature 100 DEG C, and low temperature-40 DEG C of environment left standstill after 100 hours, then up-down adjustment 10000 times, carried out conventional salt mist experiment more subsequently, still can meet salt mist experiment requirement in 300 hours.Be far longer than conventional plating durable 3000 times or the requirement in 96 hours of conventional salt mist experiment.Head rest pole after embodiment of the present invention process compares with the mechanical characteristics of the head rest pole of chromium plating, cataphoretic treatment and the results are shown in Table 1.
The mechanical properties results of the head rest pole of table 1 embodiment of the present invention process and the head rest pole of conventional process
Preferred embodiment of the present invention, not in order to limit the present invention, all do in flesh and blood of the present invention any amendment, equivalent to replace and simple modifications etc., all should be included within protection scope of the present invention.
Claims (7)
1. a head rest pole surface treatment method, is characterized in that, this processing method comprises the following steps:
(1) pre-processing: use shot-blasting machine to carry out Shot Blasting to head rest pole surface, head rest pole surface and oil contaminant is removed, makes surperficial roughen simultaneously, improve surface-treated adhesive ability;
(2) plastic-blasting: use electrostatic gun that plastic powders is sprayed on head rest pole surface equably; Wherein the particle diameter of plastic powders is 10-30 μm, and plastic powders is thermoset powders or thermoplastic plastic powder;
(3) hot setting: head rest pole is put into high-temperature baking stove, toasts 10-20min at 180-220 DEG C, the plastic powders of absorption is burnt and melts Post RDBMS, form finish coat.
2. head rest pole surface treatment method according to claim 1, is characterized in that, in step (1), the hard ball that shot-blasting machine use particle diameter is 0.1-0.5mm is as ball blast steel ball, and front and back two-way simultaneous carries out impelling to head rest pole surface.
3. head rest pole surface treatment method according to claim 1, it is characterized in that, in step (2), thermosetting plastic comprises the component of following quality proportioning: epoxy resin 30-40%, polyester 30-35%, Charge 20-30%, auxiliary agent 3-8%; Thermoplastic plastic comprises the component of following quality proportioning: polyamide 50-60%, Charge 30-40%, auxiliary agent 3-8%.
4. head rest pole surface treatment method according to claim 3, is characterized in that, Charge is one or more the mixing in blanc fixe, calcium carbonate, kaolin, diatom earth, colorant.
5. head rest pole surface treatment method according to claim 3, is characterized in that, auxiliary agent is one or more the mixing in optical brightener, benzoin, levelling agent.
6. head rest pole surface treatment method according to claim 1, is characterized in that, in step (2), by head rest pole by hanger ground connection, use electrostatic gun, plastic powders is sprayed by two-way mechanical arm, makes the powder of ejection be sprayed on head rest pole surface equably.
7. head rest pole surface treatment method according to claim 1, is characterized in that, in step (3), the thickness of finish coat is 50-150 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510631027.5A CN105150895A (en) | 2015-09-29 | 2015-09-29 | Headrest rod surface treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510631027.5A CN105150895A (en) | 2015-09-29 | 2015-09-29 | Headrest rod surface treatment method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105150895A true CN105150895A (en) | 2015-12-16 |
Family
ID=54792064
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510631027.5A Pending CN105150895A (en) | 2015-09-29 | 2015-09-29 | Headrest rod surface treatment method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105150895A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109680248A (en) * | 2017-10-18 | 2019-04-26 | 上汽通用汽车有限公司 | The surface treatment method of headrest inserted link |
| CN113444995A (en) * | 2021-05-20 | 2021-09-28 | 南通莱鑫运动用品有限公司 | Metal surface treatment method for improving wear-resisting and rust-resisting properties of sports equipment |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01223047A (en) * | 1988-02-29 | 1989-09-06 | Inoue Mtp Co Ltd | Head rest stay and its manufacture |
| CN2405485Y (en) * | 1999-12-29 | 2000-11-15 | 杭州恒丰皮革制品有限公司 | Foldable arm chair |
| CN1557570A (en) * | 2004-02-05 | 2004-12-29 | 新兴铸管股份有限公司 | Plastic-blasting process for cast iron pipe external surface |
| CN102553816A (en) * | 2010-12-28 | 2012-07-11 | 上海船舶工艺研究所 | Galvanized pipe plastic coating process |
| CN103527865A (en) * | 2012-11-14 | 2014-01-22 | 溧阳市金龙涂塑防腐有限公司 | Preparing process of plastic-coated steel tube |
| CN103752489A (en) * | 2014-01-16 | 2014-04-30 | 天广消防股份有限公司 | Surface treatment process of portable fire extinguisher |
| CN204445607U (en) * | 2015-02-12 | 2015-07-08 | 青岛永美工贸有限公司 | A kind of folding utility bath chair |
| CN104870252A (en) * | 2012-12-28 | 2015-08-26 | 伊利诺斯工具制品有限公司 | Sleeve device for headrest |
-
2015
- 2015-09-29 CN CN201510631027.5A patent/CN105150895A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01223047A (en) * | 1988-02-29 | 1989-09-06 | Inoue Mtp Co Ltd | Head rest stay and its manufacture |
| CN2405485Y (en) * | 1999-12-29 | 2000-11-15 | 杭州恒丰皮革制品有限公司 | Foldable arm chair |
| CN1557570A (en) * | 2004-02-05 | 2004-12-29 | 新兴铸管股份有限公司 | Plastic-blasting process for cast iron pipe external surface |
| CN102553816A (en) * | 2010-12-28 | 2012-07-11 | 上海船舶工艺研究所 | Galvanized pipe plastic coating process |
| CN103527865A (en) * | 2012-11-14 | 2014-01-22 | 溧阳市金龙涂塑防腐有限公司 | Preparing process of plastic-coated steel tube |
| CN104870252A (en) * | 2012-12-28 | 2015-08-26 | 伊利诺斯工具制品有限公司 | Sleeve device for headrest |
| CN103752489A (en) * | 2014-01-16 | 2014-04-30 | 天广消防股份有限公司 | Surface treatment process of portable fire extinguisher |
| CN204445607U (en) * | 2015-02-12 | 2015-07-08 | 青岛永美工贸有限公司 | A kind of folding utility bath chair |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109680248A (en) * | 2017-10-18 | 2019-04-26 | 上汽通用汽车有限公司 | The surface treatment method of headrest inserted link |
| CN113444995A (en) * | 2021-05-20 | 2021-09-28 | 南通莱鑫运动用品有限公司 | Metal surface treatment method for improving wear-resisting and rust-resisting properties of sports equipment |
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Application publication date: 20151216 |
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