CN106378945B - A kind of three-dimensional coining graphene PU tire manufacturing methods and equipment - Google Patents

A kind of three-dimensional coining graphene PU tire manufacturing methods and equipment Download PDF

Info

Publication number
CN106378945B
CN106378945B CN201611087402.5A CN201611087402A CN106378945B CN 106378945 B CN106378945 B CN 106378945B CN 201611087402 A CN201611087402 A CN 201611087402A CN 106378945 B CN106378945 B CN 106378945B
Authority
CN
China
Prior art keywords
graphene
layer
tire
coining
dimensional
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.)
Active
Application number
CN201611087402.5A
Other languages
Chinese (zh)
Other versions
CN106378945A (en
Inventor
杨卫民
谭晶
高晓东
丁玉梅
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.)
Beijing University of Chemical Technology
Original Assignee
Beijing University of Chemical Technology
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 Beijing University of Chemical Technology filed Critical Beijing University of Chemical Technology
Priority to CN201611087402.5A priority Critical patent/CN106378945B/en
Publication of CN106378945A publication Critical patent/CN106378945A/en
Application granted granted Critical
Publication of CN106378945B publication Critical patent/CN106378945B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29DPRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00Producing pneumatic or solid tyres or parts thereof
    • B29D30/06Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/08Building tyres
    • B29D30/10Building tyres on round cores, i.e. the shape of the core is approximately identical with the shape of the completed tyre
    • B29D30/16Applying the layers; Guiding or stretching the layers during application
    • B29D30/1607Applying the layers; Guiding or stretching the layers during application by feeding a sheet perpendicular to the core axis and joining the ends to form an annular element
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29DPRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00Producing pneumatic or solid tyres or parts thereof
    • B29D30/06Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/0681Parts of pneumatic tyres; accessories, auxiliary operations
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29DPRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00Producing pneumatic or solid tyres or parts thereof
    • B29D30/06Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/08Building tyres
    • B29D30/10Building tyres on round cores, i.e. the shape of the core is approximately identical with the shape of the completed tyre
    • B29D30/16Applying the layers; Guiding or stretching the layers during application
    • B29D2030/1664Details, accessories or auxiliary operations not provided for in the other subgroups of B29D30/00

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tyre Moulding (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Tires In General (AREA)

Abstract

The invention discloses a kind of three-dimensional coining graphene PU tire manufacturing methods and equipments, a certain amount of graphene will be mixed into polyurethane material, it is plasticized graphene PU composite materials using two extruders, carcass is divided into four times and is covered to complete, contact wheel rim first layer is graphene PU mixing materials, a certain amount of supercritical nitrogen is passed through in junction station after squeezing out first layer, it is squeezed out using the mixing of lamination device and the internal expandable graphite alkene PU for carrying microbubble is made, it is bonded the second layer on the basis of first layer and third layer uses expandable graphite alkene PU materials, four layers use graphene PU materials;Upper pressure roller and lower compression roller are real by each lamination during the fitting of four layer materials, and the heating platen for finally carrying tyre tread imprints out tyre tread under the drive of oil cylinder on carcass.Manufacturing method of the present invention and equipment are prepared for a kind of graphene PU foaming tires, and by the way that a certain amount of graphene and supercritical nitrogen microbubble are added in polyurethane material, manufactured PU tires have elasticity, thermal conductivity, more comfortably.

Description

A kind of three-dimensional coining graphene PU tire manufacturing methods and equipment
Technical field
The invention mainly relates to tire preparation field more particularly to a kind of three-dimensional coining graphene PU tire manufacturing methods and Device, PU are polyurethane.
Background technology
With the fast development of Hyundai Motor and aircraft industry, the requirement to tyre performance is also continuously improved.Conventional tire Mainly use rubber material, such as radial, cross-ply.However, the characteristics of conventional pneumatic is due to itself, no There are problems that avoidablely, as thorn is blown out, manufacturing forming process is complicated, military field can not resist light weapons Impact etc.;Each function of conventional tire mutually restrains, is conflicting simultaneously, can not achieve multiple-objection optimization.Gradually go out in the market Some existing pu tires, at present pu tire mostly use solid construction, Chinese patent (publication number CN103786290A, CN105330811A pu tire manufacturing method disclosed in) is moulding by casting, and tire endogenous heat is larger, poor radiation, limit Tire running speed has been made, has easily been destroyed;Polyurethane solid tyre elasticity is poor simultaneously, influences the comfort of tire running.It carries The heat resistance of high pu tire, comfort are the main problem that it is faced.
Invention content
In view of the above problems, the present invention is intended to provide a kind of three-dimensional coining graphene PU tire manufacturing methods and equipment, lead to It crosses material prescription, foaming technique, stacking extrusion and stamping technique and can be made into the graphite with high-fire resistance, high resiliency and low noise Alkene PU foaming tires.
The present invention is intended to provide a kind of three-dimensional coining graphene PU tire manufacturing methods, will be mixed into certain in polyurethane material The graphene of amount is plasticized graphene PU composite materials using two extruders, and servo motor drives wheel rim rotation, tire after extrusion Body is wrapped on wheel rim, and carcass is divided into four times and is covered to complete, and contact wheel rim first layer is graphene PU mixing materials, squeezes out first It is passed through a certain amount of supercritical nitrogen in junction station after layer, is squeezed out using the mixing of lamination device and the internal hair for carrying microbubble is made Graphene PU is steeped, the second layer is bonded on the basis of first layer and third layer, the second layer and third layer is all made of expandable graphite alkene PU materials stop being passed through supercritical nitrogen to junction station, and the 4th layer i.e. tyre surface uses graphene PU materials;Extruder stops work Make;Upper pressure roller and lower compression roller are real by each lamination during the fitting of four layer materials, finally carry the heating platen of tyre tread in oil cylinder Drive under tyre tread is imprinted out on carcass.
The present invention is intended to provide a kind of three-dimensional coining graphene PU tires, wherein wheel rim uses alloy material or carbon fiber Dimension enhancing composite material.
The present invention is intended to provide a kind of three-dimensional coining graphene PU tire preparation methods, wherein the acquisition of microbubble is main By following manner:Supercritical nitrogen becomes single-phase melt with melt mixed, because there is between two layers, two layers melt in junction station It is passed through one layer of gas;Further make pore size close using stacking device, be evenly distributed, after being bonded on wheel rim, reduces pressure Or cooling just will produce micro- stomata, and pore opening is controlled by temperature change and pressure drop.
A kind of three-dimensional coining graphene PU tire preparation methods provided by the invention, wherein tyre tread is by being carved with flower The heating platen coining of line completes, and the temperature of heating platen is adjusted by electromagnetic heating controller, and pressure is provided by oil cylinder, according to not With modified polyurethane material, heating platen can provide different imprint temperatures, pressure and time.The production method of tyre tread The production method that existing decorative pattern may be used, by the internal tire forming mold hot pressing postcooling for carrying decorative pattern, molding die band Having heaters preheats tire base, cools down after the upper decorative pattern of tire base pressure, obtains final tire product.
A kind of three-dimensional coining graphene PU tire preparation methods provided by the invention, in order to reduce wave caused by raw material is replaced Take, can be there are two station be squeezed out, each station has two extruders and junction station, stacking device, head, wherein there are one converging Stream device has supercritical nitrogen injected system, and first layer is bonded in this way on wheel rim and the 4th layer uses not with the second layer and third layer Same extrusion station.
A kind of three-dimensional coining graphene PU tire preparation methods provided by the invention, the second layer and third layer cell content can It can also be different with identical, i.e., the second layer and third layer can be same material, or not same material, it is whole according to tire The aeroelastic requirements of body determine the proportioning of material.Because the middle layer of usual carcass is thicker, for the ease of fitting, even if material of the same race Material also divides two layers of fitting.Third layer can also be than second layer softness because of close tyre surface.Four layers of runner that all have passed through stacking device, stone Black alkene has certain orientation, the resistance to thorn ability of tire of formation to improve, and conductibility is also improved, and thermal diffusivity is improved.
The present invention provides a kind of three-dimensional coining graphene PU Tire productions equipment, mainly by pu tire extruding part and Carcass impression partial forms.Extruding part is mainly made of two extruders, nitrogen compressor, junction station, stacking device and head; Carcass impression partial is mainly made of oil cylinder, rack, heating platen, pressure roller, wheel rim and transmission device.
The present invention provides a kind of three-dimensional coining graphene PU Tire productions equipment, the junction station both sides difference in extruding part It is connected with extruder, extruded material selects the intermingling material of polyurethane and graphene.Junction station medial inlet and nitrogen compressor Connection, can be passed through the supercritical nitrogen of predetermined amount in different phase.Selection two extruders are easy for the runner of gas being passed through Design.Junction station outlet is connected with stacking device, and stacking device has n unit, m segmentation, torsion that m can be obtainednLayer composite material film Layer;Stacking device outlet connection extruder head, wheel rim of the head close to carcass impression partial.
The present invention provides a kind of three-dimensional coining graphene PU Tire productions equipment, wherein the oil cylinder of carcass impression partial is solid It is scheduled in rack, cylinder putter couples with tyre surface heating platen.Rack couples upper pressure roller and lower compression roller respectively up and down, and upper pressure roller is under Pressure roller is all connect with export bar;Wheel rim is fixed on the rotating shaft by clamping device, and rotation axis one end couples servo motor.
The present invention is intended to provide a kind of three-dimensional coining graphene PU Tire productions equipment, wherein entire carcass extruding part Whole two-dimensional movement all around can occur to wheel rim direction, while head is detachable, is exchanged according to rim size.
The present invention is intended to provide a kind of three-dimensional coining graphene PU Tire productions equipment, wherein the heat of carcass impression partial Pressing plate can move up and down under the promotion of oil cylinder, and tyre tread is carved on the downside of heating platen;Heating platen can be big according to tire size It is small to carry out dismounting exchange;It is uniformly distributed heat block on the upside of heating platen, using electromagnetic heating mode;Heating platen decorative pattern shaped front end and End coincide, amorphism and size difference.
The invention has the advantages that:
1, the present invention uses detachable Embosser one-pass molding, can produce and process sizes tire, realizes flexible Manufacture.
2, the present invention proposes a kind of graphene PU foaming tires, by the way that a certain amount of graphite is added in polyurethane material Alkene improves PU material thermal conductivities, plays cooling effect, improve the heat resistance of tire.
3, the present invention uses lamination techniques, improves the intensity of PU materials, and supercritical nitrogen microbubble is homogenized, and is made The flexible PU tires of tire improve the elasticity of tire, and tyre deflection increases, comfort enhancing.
Description of the drawings
Fig. 1 is a kind of three-dimensional coining graphene PU Tire production equipment configuration schematic diagrames of the present invention.
Fig. 2 is a kind of three-dimensional coining graphene PU tire section schematic diagrames of the present invention.
In figure, 1- oil cylinders, 2- heating platens, 3- rotation axis, 4- lower compression rollers, 5- racks, 6- wheel rims, the upper pressure rollers of 7-, 8- heads, 9- stacking devices, 10- junction stations, 11- extruders one, 12- nitrogen compressors, 13- extruders two, the micro- hairs of 14- graphenes PU, 15- Bubble.
Specific implementation mode:
The present invention is intended to provide a kind of three-dimensional coining graphene PU tire manufacturing methods and equipment.Specific implementation method is: The first step, carries out material prescription first, and graphene obtains tire by being blended in a certain amount of addition conventional urethane tire material Body material.Second step, entire extrusion portion advance, and make head 8 close to wheel rim;Graphene PU intermingling materials are added to extruder one 11 and extruder 2 13 in be plasticized, pass through junction station 10, stacking device 9 and head 8 squeeze out graphene PU14 material sheets;Wheel rim 6 Rotated counterclockwise under the drive of rotation axis 3, sheet material is pressed onto on wheel rim by upper pressure roller 7, sheet material it is Nian Jie with wheel rim generation and with Wheel rim rotates, and when sheet material leading portion goes to lower compression roller 4, lower compression roller 4, which is leant out, is further compacted sheet material, and sheet material wraps up wheel rim one week Afterwards, extruder stops squeezing out, and sheet cutting, wheel rim quickly rotates, and further compacting is bonded to wheel rim 6 for upper pressure roller 7, lower compression roller 4. Third walks, and nitrogen compressor 12 is started to work, and supercritical nitrogen is passed through in junction station 10, passes through stacking device by extruder work 9, head 8 prepares the expandable graphite alkene PU sheet materials containing microbubble, and the second layer and third layer are carried out to wheel rim according to second step Package compacting, the second layer and third layer are 15 structure of fretting map.4th step, nitrogen compressor 12 is stopped, according to second Step carries out the 4th layer and carries out package compacting;5th step, after preliminary consolidation, upper pressure roller, lower compression roller are recalled, and heating platen 2 is in oil cylinder 1 It pushes and pushes, imprint out tyre tread, once after coining, heating platen 2 is recalled, and wheel rim rotates an angle, is carried out second Coining, the back-end location of second of pressing plate are the front position of coining for the first time, i.e. the seamless connection with last stamping, Ensure fluency, the continuity of decorative pattern.The decorative pattern coining of entire tyre surface is finally completed by multi-impression, tire completes.
By a kind of three-dimensional coining graphene PU tire manufacturing methods of aforementioned present invention it is found that the manufacturing device of the present invention includes Extruding part and carcass impression partial, extruding part is mainly by extruder 1, extruder 2 13, nitrogen compressor 12, confluence Device 10, stacking device 9 and head 8 form;Carcass impression partial is mainly by oil cylinder 1, rack 5, heating platen 2, upper pressure roller 7, lower compression roller 4, wheel rim 6 and the transmission device composition with rotation axis 3.
The present invention provides a kind of three-dimensional coining graphene PU Tire productions equipment, 10 both sides of junction station point in extruding part It is not connected with extruder 1, extruder 2 13, extruded material selects the intermingling material of polyurethane and graphene.In junction station 10 Between entrance couple with nitrogen compressor 12, the supercritical nitrogen of predetermined amount can be passed through in different phase.Junction station 10 exports and layer Folded device 9 is connected, and m can be obtained by n stacking device unit, m segmentation, torsion in stacking device 9nLayer composite material film layer;Stacking device 9 Outlet connection extruder head 8, wheel rim 6 of the head 8 close to carcass impression partial.
The present invention provides a kind of three-dimensional coining graphene PU Tire productions equipment, wherein the oil cylinder 1 of carcass impression partial is solid It is scheduled in rack 5, cylinder putter couples with tyre surface heating platen 2.About 5 rack couples pressure roller 7 and lower compression roller 4, upper pressure respectively Roller 7 and lower compression roller 4 are all connect with export bar;Wheel rim 6 is fixed on by clamping device in rotation axis 3, and the connection of 3 one end of rotation axis is watched Take motor.
The present invention provides a kind of three-dimensional coining graphene PU Tire productions equipment, wherein entire carcass extruding part can be to Whole two-dimensional movement all around occurs for 6 direction of wheel rim, while head 8 is detachable, is exchanged according to 6 size of wheel rim.

Claims (7)

1. a kind of three-dimensional coining graphene PU tire manufacturing methods, it is characterised in that:It is a certain amount of by being mixed into polyurethane material Graphene is plasticized graphene PU composite materials using two extruders, and servo motor drives wheel rim rotation, carcass packet after extrusion It is rolled on wheel rim, carcass is divided into four times and is covered to complete, and contact wheel rim first layer is graphene PU mixing materials, after squeezing out first layer It is passed through a certain amount of supercritical nitrogen in junction station, is squeezed out using stacking device mixing and the internal foaming stone for carrying microbubble is made Black alkene PU is bonded the second layer on the basis of first layer and third layer, the second layer and third layer is all made of expandable graphite alkene PU materials Material stops being passed through supercritical nitrogen to junction station, and the 4th layer uses graphene PU materials;Extruder is stopped;Four layer materials Upper pressure roller and lower compression roller are real by each lamination during fitting, finally the heating platen with tyre tread under the drive of oil cylinder in tire Tyre tread is imprinted out on body.
2. a kind of three-dimensional coining graphene PU tire manufacturing methods according to claim 1, it is characterised in that:Wheel rim uses Alloy material or carbon fibre reinforced composite.
3. a kind of three-dimensional coining graphene PU tire manufacturing methods according to claim 1, it is characterised in that:Tyre tread Heating platen by being carved with decorative pattern, which imprints, to complete, and the temperature of heating platen is adjusted by electromagnetic heating controller, and pressure is by oil cylinder It provides, according to the polyurethane material of different modifications, heating platen can provide different imprint temperatures, pressure and time.
4. a kind of three-dimensional coining graphene PU tire manufacturing methods according to claim 1, it is characterised in that:There are two squeeze Go out station, each station has two extruders and junction station, stacking device, head, wherein there are one have overcritical nitrogen in junction station Gas injected system.
5. special using a kind of three-dimensional coining graphene PU Tire productions equipment of tire manufacturing method described in claim 1 Sign is:It is made of pu tire extruding part and carcass impression partial, extruding part is mainly by two extruders, nitrogen pressure Contracting machine, junction station, stacking device and head composition;Carcass impression partial is mainly by oil cylinder, rack, heating platen, pressure roller, wheel rim and biography Dynamic device composition;Junction station both sides in extruding part are connected with extruder respectively, and extruded material selects polyurethane and graphene Intermingling material;Junction station medial inlet couples with nitrogen compressor, and the supercritical nitrogen of predetermined amount can be passed through in different phase; Junction station outlet is connected with stacking device, and stacking device has n unit, m segmentation, torsion that m can be obtainednLayer composite material film layer;Layer Folded device outlet connection extruder head, wheel rim of the head close to carcass impression partial;The oil cylinder of carcass impression partial is fixed on rack On, cylinder putter couples with tyre surface heating platen, and rack couples upper pressure roller and lower compression roller respectively up and down, upper pressure roller and lower compression roller all with Export bar connects;Wheel rim is fixed on the rotating shaft by clamping device, and rotation axis one end couples servo motor.
6. a kind of three-dimensional coining graphene PU Tire productions equipment according to claim 5, it is characterised in that:Entire tire Whole two-dimensional movement all around can occur to wheel rim direction for extruding part, while head is detachable, is carried out according to rim size It exchanges.
7. a kind of three-dimensional coining graphene PU Tire productions equipment according to claim 5, it is characterised in that:Carcass imprints Partial heating platen can move up and down under the promotion of oil cylinder, and tyre tread is carved on the downside of heating platen;Heating platen can be according to wheel Tire size carries out dismounting exchange;It is uniformly distributed heat block on the upside of heating platen, using electromagnetic heating mode;Heating platen decorative pattern shape Shape front end and end coincide, amorphism and size difference.
CN201611087402.5A 2016-12-01 2016-12-01 A kind of three-dimensional coining graphene PU tire manufacturing methods and equipment Active CN106378945B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201611087402.5A CN106378945B (en) 2016-12-01 2016-12-01 A kind of three-dimensional coining graphene PU tire manufacturing methods and equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201611087402.5A CN106378945B (en) 2016-12-01 2016-12-01 A kind of three-dimensional coining graphene PU tire manufacturing methods and equipment

Publications (2)

Publication Number Publication Date
CN106378945A CN106378945A (en) 2017-02-08
CN106378945B true CN106378945B (en) 2018-10-23

Family

ID=57959764

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201611087402.5A Active CN106378945B (en) 2016-12-01 2016-12-01 A kind of three-dimensional coining graphene PU tire manufacturing methods and equipment

Country Status (1)

Country Link
CN (1) CN106378945B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109334351B (en) * 2018-10-30 2022-01-28 济南奥美联亚工矿设备有限公司 Polyurethane solid tire and manufacturing method thereof

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4221624A (en) * 1978-04-03 1980-09-09 Eslinger Haynes L Method of manufacturing a foamed core thermoplastic sheet
IN2014DN05936A (en) * 2011-12-16 2015-06-12 Alan Erdman
CN202986684U (en) * 2012-10-16 2013-06-12 北京化工大学 High-performance tire of microcellular foaming on surface of crown
CN103786290B (en) * 2014-01-22 2017-01-04 杭州台创实业有限公司 The manufacture method of casting elastomer pu tire
CN104149371A (en) * 2014-08-07 2014-11-19 北京化工大学 Method and equipment for manufacturing tire with tread patterns
CN105330811A (en) * 2015-11-27 2016-02-17 嘉兴禾欣化学工业有限公司 Polyurethane solid tire material and preparation method thereof
CN206394063U (en) * 2016-12-01 2017-08-11 北京化工大学 A kind of three-dimensional impressing graphene PU Tire productions equipment

Also Published As

Publication number Publication date
CN106378945A (en) 2017-02-08

Similar Documents

Publication Publication Date Title
CN206394063U (en) A kind of three-dimensional impressing graphene PU Tire productions equipment
CN104524748B (en) A kind of sticky ball and its manufacture craft
JP3954195B2 (en) Tire molding apparatus and tire molding method using the same
CN107186937A (en) Calender, foaming floor production line and one-shot forming production technology
CN207415828U (en) Calender and foaming floor production line
CN105459422B (en) Time processing PVC floor shaping mechanism
CN106378945B (en) A kind of three-dimensional coining graphene PU tire manufacturing methods and equipment
CN104786458B (en) The manufacturing technique method and equipment of a kind of three-dimensional hollow out formed product of continuous extrusion
CN101077620B (en) Method for manufactruing wireless plate seam laser packaging film
US3808076A (en) Methods and apparatus for applying tread to tyres or wheels
CN201287498Y (en) Pressing back printing roller of laser holography swaging hammer
CN111531931A (en) Production process of tyre casing
US2309042A (en) Method of treading tires
US7052568B2 (en) Tire retreading method
CN201761079U (en) Embossing machine
CN2367450Y (en) Multilayer coextruding pyrocondensation film apparatus
CN107253340A (en) It is a kind of solid to exempt to inflate manufacture method of overall plastic wheel and products thereof
CN106956448A (en) A kind of preparation method of hollow out ball
US3236712A (en) Process of producing molded and printed surface pattern in plastic stock
CN206230775U (en) A kind of multi-mould formula automatic injection machine
CN207256926U (en) A kind of continuous hot-press molding machine that multi-angle ripple packing is prepared with carbon fibre composite
CN106239858B (en) A kind of composite tube section bar production method
CN1050323C (en) Retreading device
CN107073552A (en) The building mortion of bead core
CN209504981U (en) Steel band evener and its plastic floor molding equipment of application

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant