CN103395206A - True color printing method and true color printing device - Google Patents
True color printing method and true color printing device Download PDFInfo
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- CN103395206A CN103395206A CN2013103150307A CN201310315030A CN103395206A CN 103395206 A CN103395206 A CN 103395206A CN 2013103150307 A CN2013103150307 A CN 2013103150307A CN 201310315030 A CN201310315030 A CN 201310315030A CN 103395206 A CN103395206 A CN 103395206A
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Abstract
The invention discloses a true color printing method and a true color printing device. According to the method, the material extrusion speeds of a plurality of printer nozzles are controlled according to colors of models to be machined; colors of materials filled in the plurality of printer nozzles are different; the materials extruded out by the plurality of printer nozzles are heated for melting, and then a model is printed. According to the technical scheme provided by the invention, not only is the hardware cost saved, and also the true color printing is realized based on a fast modeling system in an FDM (Fused deposition modeling) process.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of very color Method of printing and device.
Background technology
It is a kind of technology of rapid shaping that 3D prints, and it is a kind of take the mathematical model file as basis, but uses the jointing materials such as powdery metal or plastics, carrys out the technology of constructed object by the mode of successively printing.Announce in the speech of US President Barack Obama's national conditions at the beginning of 2013, the 3D print center is set up in plan, and the 3D printing technique will progressively become the emerging manufacturing industry of the U.S., greatly promote thus the development of 3D printing technique.At present this technology has been carried out a large amount of research both at home and abroad, this technology all is widely used at jewelry, footwear, industrial design, building, engineering and construction (AEC), automobile, Aero-Space, dentistry and medical industries, education, GIS-Geographic Information System, civil engineering, gun and other field.
In correlation technique, the 3D printing technique mainly contains stereolithography apparatus method (SLA), selective laser sintering (SLS), laminated solid body manufacturing (LOM), melt extrudes several techniques such as moulding (FDM), wherein, FDM technique is cheap with its material price, the low approval of having won users and market of technical threshold, has become one of the most potential technology.The material of FDM technique is thermoplastic normally, such as: wax, ABS, PC, nylon etc., with thread feed.Material is heated fusing in shower nozzle, shower nozzle is along the part section profile and fill orbiting motion, and the material that will melt is simultaneously extruded, and material solidifies rapidly, and with on every side material binding.
FDM technique adopts filamentary material more, and the color of filamentary material has namely determined to process the color of model.For this kind situation, a solution has been proposed in correlation technique, solve by increasing shower nozzle, if there are three shower nozzles just can realize three looks printings, if there be N shower nozzle just can realize the printing of N look.But its operation principle all the time or material color decision model color, and have the matching problem between shower nozzle during a plurality of nozzle printing, and the cost that a plurality of shower nozzles bring is installed is increased problem.
This shows, there is following problem in the solution that proposes in correlation technique:
The rapid prototyping system based on FDM technique in problem one, correlation technique can only be processed limited several colors, and the shower nozzle color has determined the color of printer model.
The rapid prototyping system based on FDM technique in problem two, correlation technique adopts increases the color diversity to solve very color problem, has increased thus the production cost of shades of colour material, and can't exhaustive all colours.
The rapid prototyping system based on FDM technique in problem three, correlation technique lacks in print procedure considers colouring information;
In addition, although the rapid prototyping system based on SLS technique in correlation technique can be realized very color the printing, its material that uses costs dearly.
Summary of the invention
The invention provides a kind of very color Method of printing and device, with the rapid prototyping system based on FDM technique that solves at least in correlation technique, be difficult to realize the very color problem of printing in print procedure.
According to an aspect of the present invention, provide a kind of very color Method of printing.
Very color Method of printing according to the present invention comprises: control the speed of each printer head extruding material in a plurality of printer heads according to the color of model to be processed, wherein, the color inequality of the material of filling in a plurality of printer heads; The material that a plurality of printer heads are squeezed out carries out heat fused, printer model.
Preferably, the speed of controlling each printer head extruding material according to the color of model comprises: according to the color of model, choose a plurality of printer heads from Print All machine shower nozzle; Determine the ratio of the color of filling in each printer head according to the color of model; The ratio of the color that employing is determined is calculated the speed of each printer head extruding material.
Preferably, the color according to described model is chosen described a plurality of printer head from described Print All machine shower nozzle before, also comprise: obtain the positional information of each printer head in described Print All machine shower nozzle and the colouring information corresponding with this positional information.
Preferably, the material that described a plurality of printer heads are squeezed out carries out heat fused, prints described model and comprises: current time is carried out heat fused by the material that described a plurality of printer heads squeeze out; Be cured with filling the material of track after with heat fused according to the cross section profile of described model, and with the department pattern of having printed, carry out bonding.
Preferably, the quantity of a plurality of printer heads is 3, and wherein, it is red, green, blue that the color of the material of filling in each printer head is respectively.
Preferably, the quantity of a plurality of printer heads is 3, and wherein, the color of the material of filling in each printer head is respectively cyan, magenta, yellow.
According to a further aspect in the invention, provide a kind of very color printing equipment.
Very color printing equipment according to the present invention comprises: control module, be used for the speed according to each printer head extruding material of a plurality of printer heads of color control of model to be processed, wherein, the color inequality of the material of filling in a plurality of printer heads; Print module, the material that is used for a plurality of printer heads are squeezed out carries out heat fused, printer model.
Preferably, control module comprises: choose unit, be used for choosing a plurality of printer heads according to the color of model from Print All machine shower nozzle; Determining unit, for determine the ratio of the color that each printer head is filled according to the color of model; Computing unit, the ratio that is used for the definite color of employing is calculated the speed of each printer head extruding material.
Preferably, said apparatus also comprises: acquisition module; Acquisition module, for the positional information of each printer head that obtains Print All machine shower nozzle and the colouring information corresponding with this positional information.
Preferably, print module comprises: heating unit is used for current time is carried out heat fused by the material that a plurality of printer heads squeeze out; Felting cell, be used for being cured with filling the material of track after with heat fused according to the cross section profile of model, and with the department pattern of having printed, carry out bonding.
by the present invention, adopt the speed of controlling each printer head extruding material in a plurality of printer heads according to the color of model to be processed, wherein, the color inequality of the material of filling in a plurality of printer heads, the material that a plurality of printer heads are squeezed out carries out heat fused, printer model, thus, broken away from the correlation technique and determined the color of model to be processed according to the material color of filling in printer head, but by a plurality of printer heads are installed on printer, the color of the material of filling in each printer head is different, the color of determining the material of filling in each printer head according to the color of model to be processed is proportioning how, to control the speed of each printer head extruding material, and then shades of colour is merged, difference according to the speed of each printer head extruding material, the material that each printer head is squeezed out carries out heat fused, the color of the model that prints presents variation, solved the rapid prototyping system based on FDM technique in the correlation technique and be difficult to realize the very color problem of printing in print procedure, and then not only saved hardware cost, but also realized very color printing the based on the rapid prototyping system of FDM technique.
Description of drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the application's a part, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not form improper restriction of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart according to the very color Method of printing of the embodiment of the present invention;
Fig. 2 is the structured flowchart according to the very color printing equipment of the embodiment of the present invention;
Fig. 3 is the structured flowchart of very color printing equipment according to the preferred embodiment of the invention;
Fig. 4 is the structural representation of very color printing equipment according to the preferred embodiment of the invention.
The specific embodiment
Hereinafter with reference to accompanying drawing, also describe in conjunction with the embodiments the present invention in detail.Need to prove, in the situation that do not conflict, embodiment and the feature in embodiment in the application can make up mutually.
Fig. 1 is the flow chart according to the very color Method of printing of the embodiment of the present invention.As shown in Figure 1, the method can comprise following treatment step:
Step S102: control the speed of each printer head extruding material in a plurality of printer heads according to the color of model to be processed, wherein, the color inequality of the material of filling in a plurality of printer heads;
Step S104: the material that a plurality of printer heads are squeezed out carries out heat fused, printer model.
In correlation technique, based on the rapid prototyping system of FDM technique, be difficult to realize very color the printing in print procedure.The operation principle that adopts in correlation technique is the color that the color of shower nozzle has determined printing objects, the single spraying head can only be printed monochrome, two shower nozzles also can only be printed double-colored, print a plurality of colors need to install a plurality of shower nozzles if wish, even can print a plurality of colors and also be difficult to realize very color the printing but a plurality of shower nozzles have been installed, and increase undoubtedly hardware cost.adopt method as shown in Figure 1, control the speed of each printer head extruding material in a plurality of printer heads according to the color of model to be processed, wherein, the color inequality of the material of filling in a plurality of printer heads, the material that a plurality of printer heads are squeezed out carries out heat fused, printer model, thus, broken away from the correlation technique and determined the color of model to be processed according to the material color of filling in printer head, but by a plurality of printer heads are installed on printer, the color of the material of filling in each printer head is different, the color of determining the material of filling in each printer head according to the color of model to be processed is proportioning how, to control the speed of each printer head extruding material, and then shades of colour is merged, difference according to the speed of each printer head extruding material, the material that each printer head is squeezed out carries out heat fused, the color of the model that prints presents variation, solved the rapid prototyping system based on FDM technique in the correlation technique and be difficult to realize the very color problem of printing in print procedure, and then not only saved hardware cost, but also realized very color printing the based on the rapid prototyping system of FDM technique.
In preferred implementation process, the quantity of above-mentioned a plurality of printer heads can be 3, and wherein, it is red, green, blue that the color of the material of filling in each printer head is respectively.
Primaries pattern (RGB color model), can be called again RGB color model or RGB color model, it is a kind of color model that adds, refer to that any color can mix according to different ratios with red (Red), green (Green), blue (Blue) these three kinds of colors, and every kind of color can resolve into three kinds of basic colors.Be separate between three primary colors, any color all can not be comprised of remaining two kinds of color.The saturation degree of secondary colour is decided by the ratio of above-mentioned three kinds of colors, and the brightness of secondary colour is the brightness sum of above-mentioned three kinds of colors.It is as follows that these three kinds of colors of red, green, blue are mixed the secondary colour that produces mutually:
Red+green=yellow;
Green+blueness=cyan;
Red+blue=magenta;
Red+green+blueness=white;
In a preferred embodiment, 3 printer heads can be installed on the 3D printer, and respectively add red material, green material and blue material in 3 printer heads, then according to the color of model to be processed, can adopt these three kinds of colors of red, green, blue to mix according to different ratios.Owing to only needing 3 printer heads can realize printing the model of multiple color, not only saved hardware cost, also realized simultaneously very color the printing.
In preferred implementation process, the quantity of above-mentioned a plurality of printer heads can be 3, and wherein, the color of the material of filling in each printer head is respectively cyan, magenta, yellow.
Rely on the passive luminous occasion of reflection of dielectric surface at printing, printing, paint, drawing etc., the color that object presents is remaining part after being absorbed by pigment in light source, and therefore, the principle of its quality is called the subtractive process principle.The subtractive process principle is widely used in various passive luminous occasions.Three primary colors pigment in the subtractive process principle is respectively blue or green (Cyan), pinkish red (Magenta) and yellow (Yellow).Yellow, cyan and magenta are all formed by two kinds of blend of colors, so they are referred to as again the addition secondary colours.
In addition, due to redness+cyan=white, green+pinkish red=white, blue+yellow=white, therefore, cyan, yellow, magenta are again respectively red, blue, green complementary colors.Under white light, green pigment can absorb redness and the reflection cyan, and yellow uitramarine absorbs blue and reflects yellow, and magenta pigment absorbs green and the reflection magenta.
Mixing for the three primary colors pigment in the subtractive process principle can be expressed as follows:
Yellow+cyan=white-redness-blueness=green
Magenta+cyan=white-redness-green=blueness
Yellow+magenta=white-green-blueness=redness
Cyan+yellow+magenta=white-redness-blueness-green=black
Above subtractive mixture of colors forms different colors according to absorbing three primary colours ratio difference.Therefore, usually cyan, magenta, yellow are called the pigment three primary colours.The colour mixture of pigment three primary colours is used widely in drawing, printing.
In a preferred embodiment, 3 printer heads can be installed on the 3D printer, and respectively add cyan material, magenta material, yellow material in 3 printer heads, then according to the color of model to be processed, can adopt cyan, magenta and yellow these three kinds of colors according to absorbing different formation of three primary colours ratio.Owing to only needing 3 printer heads can realize printing the model of multiple color, not only saved hardware cost, also realized simultaneously very color the printing.
Preferably, in step S102, the speed of controlling each printer head extruding material according to the color of model can comprise following operation:
Step S1: according to the color of model, choose a plurality of printer heads from Print All machine shower nozzle;
Step S2: the ratio of determining the color of filling in each printer head according to the color of model;
Step S3: the ratio of the color that employing is determined is calculated the speed of each printer head extruding material.
In a preferred embodiment, although 3 printer heads are installed in the 3D printer of current operation in initial configuration process, add respectively red material, green material and blue material, but the color of model to be processed may be in these three kinds of colors of simple red, green, blue wherein a kind of color (for example: redness), therefore, need to choose the printer head that adds red material from above-mentioned 3 printer heads and print above-mentioned model; , if model to be processed is yellow, needs to choose the printer head that adds red material and green material and print above-mentioned model from above-mentioned 3 printer heads; , if model to be processed is white, needs to choose whole 3 printer heads and print above-mentioned model.
In a preferred embodiment, suppose that model to be processed is bronze-colored, 3 printer heads are installed in the 3D printer of current operation in initial configuration process, add respectively cyan material, magenta material, yellow material.Can determine thus the ratio of cyan, magenta and yellow these three kinds of color absorption three primary colours according to the color of model to be processed, as can be known: yellow material accounts for 50%, cyan material and magenta material respectively account for 25%, the speed that therefore, can calculate the printer head extruding material that adds yellow material is to add 2 times of speed of speed and the printer head extruding material that adds the magenta material of the printer head extruding material of cyan material.
Preferably,, at step S1, before choosing described a plurality of printer head according to the color of described model from described Print All machine shower nozzle, can also comprise the following steps:
Step S4: obtain the positional information of each printer head in described Print All machine shower nozzle and the colouring information corresponding with this positional information.
In a preferred embodiment, the 3D printer is directly controlled by the computer that modeling software has been installed usually.Call in SOLID model (being stl file) and be converted into G code in software, then G code is sent to the circuit part of printer by USB interface, should how to control the movement of three axles with the notice printer.The colouring information that can add the material of filling in each printer head of installing in current 3D printer in model construction process, then with model conversation be add in the G code process that can identify of 3D printer each printer head in the 3D printer positional information and each printer head in the colouring information of the material of filling.In print procedure, can choose a plurality of printer heads from Print All machine shower nozzle according to the colouring information in G code, thereby calculate each speed of each printer head extruding material constantly.
Preferably, in step S104, the material that described a plurality of printer heads are squeezed out carries out heat fused, prints described model and can comprise following operation:
Step S5: current time is carried out heat fused by the material that described a plurality of printer heads squeeze out;
Step S6: be cured with filling the material of track after with heat fused according to the cross section profile of described model, and with the department pattern of having printed, carry out bonding.
In a preferred embodiment, the material of FDM technique can adopt thermoplastic usually, such as: wax, ABS, PC, nylon etc., with thread feed.The material that a plurality of printer heads squeeze out is heated fusing.Shower nozzle is along the part section profile and fill orbiting motion, and the material that will melt is simultaneously extruded, material solidify rapidly and with on every side material binding.Each synusia is to pile up and form on last layer, the effect that last layer plays location and supports current layer.Along with the increase of height, the area of synusia profile and shape all can change, and when shape had greatly changed, the upper strata profile just can't provide sufficient location and supporting role to current layer.In the layering manufacture process, when upper layer cross section during greater than lower layer cross section, having more part and there will be suspension (or unsettled) of upper layer cross section, subside or be out of shape thereby cross-section is divided, and affects the formed precision of part prototype, even makes the product prototype can not moulding.This just needs some supplementary structure-supports of design, succeeding layer is provided location and supports, to guarantee the smooth realization of print procedure.Support to also have an important purpose to be to set up basal layer, set up cushion between the bottom of workbench and prototype, be convenient to the stripping operation platform after prototype is completed.In addition, base support can also provide a datum level to manufacture process.
Fig. 2 is the structured flowchart according to the very color printing equipment of the embodiment of the present invention.As shown in Figure 2, this very color printing equipment can comprise: control module 10, be used for controlling according to the color of model to be processed the speed of each printer head extruding material of a plurality of printer heads, wherein, the color inequality of the material of filling in a plurality of printer heads; Print module 20, the material that is used for a plurality of printer heads are squeezed out carries out heat fused, printer model.
Adopt device as shown in Figure 2, solved the rapid prototyping system based on FDM technique in the correlation technique and be difficult to realize the very color problem of printing in print procedure, and then not only saved hardware cost, but also realized very color printing the based on the rapid prototyping system of FDM technique.
Preferably, as shown in Figure 3, control module 10 can comprise: choose unit 100, be used for choosing a plurality of printer heads according to the color of model from Print All machine shower nozzle; Determining unit 102, for determine the ratio of the color that each printer head is filled according to the color of model; Computing unit 104, the ratio that is used for the definite color of employing is calculated the speed of each printer head extruding material.
Preferably, as shown in Figure 3, said apparatus can also comprise: acquisition module 30; Acquisition module 30, for the positional information of each printer head that obtains Print All machine shower nozzle and the colouring information corresponding with this positional information.
Preferably, as shown in Figure 3, print module 20 can comprise: heating unit 200 is used for current time is carried out heat fused by the material that a plurality of printer heads squeeze out; Felting cell 202, be used for being cured with filling the material of track after with heat fused according to the cross section profile of model, and with the department pattern of having printed, carry out bonding.
Below in conjunction with preferred embodiment shown in Figure 4, above-mentioned preferred implementation process is further described.
Fig. 4 is the structural representation of very color printing equipment according to the preferred embodiment of the invention.As shown in Figure 4, in the preferred embodiment, with the 3D printer, 3 printer heads are installed in initial configuration process, adding respectively cyan material, magenta material, yellow material is that example describes, and above-mentioned 3 printer heads enter heating clamber by different feed pipes respectively.Suppose that model to be processed is olive colour, can determine thus the ratio of cyan, magenta and yellow these three kinds of color absorption three primary colours according to the color of model to be processed, as can be known: the cyan material accounts for 50%, yellow material and magenta material respectively account for 25%, the speed that therefore, can calculate the printer head extruding material that adds the cyan material is to add 2 times of speed of speed and the printer head extruding material that adds the magenta material of the printer head extruding material of yellow material.Then, the material of three kinds of colors, through heating, fusing, is sent to shower nozzle, from shower nozzle, extrudes and is bonded to work top, and is then fast cooling and solidify.After each layer cross section is completed, the height of workbench decline one deck, then proceed the moulding of lower one deck.So repeat, until complete the moulding of whole entity.The thickness of every layer can be determined according to the diameter of shower nozzle extrded material.The 3D printer itself has a framework and three axles: X-axis moves left and right, Y-axis moves forward and backward and Z axis moves up and down.Extruder head can be arranged on support on X-axis, melts and extruding material.The circuit part of 3D printer is controlled the motion of three axles, guarantees that extruder head can be stacked to material on printout in position accurately.
As can be seen from the above description, above-described embodiment has been realized following technique effect (need to prove that these effects are effects that some preferred embodiment can reach): the object of the present invention is to provide a kind of very color Method of printing based on FDM.Adopt the rapidform machine of FDM technique also can utilize limited several colors to print the object model of RGB based on the present invention.Can realize that than other very color techniques of printing can save the printing cost effectively, can be used for the products such as rapid shaping platform, 3D printer based on FDM technique.
obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general calculation element, they can concentrate on single calculation element, perhaps be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in storage device and be carried out by calculation element, and in some cases, can carry out step shown or that describe with the order that is different from herein, perhaps they are made into respectively each integrated circuit modules, perhaps a plurality of modules in them or step being made into the single integrated circuit module realizes.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a very color Method of printing, is characterized in that, comprising:
Control the speed of each printer head extruding material in a plurality of printer heads according to the color of model to be processed, wherein, the color inequality of the material of filling in described a plurality of printer heads;
The material that described a plurality of printer heads are squeezed out carries out heat fused, prints described model.
2. method according to claim 1, is characterized in that, the speed of controlling described each printer head extruding material according to the color of described model comprises:
Choose described a plurality of printer head according to the color of described model from Print All machine shower nozzle;
Determine the ratio of the color of filling in described each printer head according to the color of described model;
Adopt the speed of described each the printer head extruding material of ratio calculating of the color of determining.
3. method according to claim 2, is characterized in that, the color according to described model is chosen described a plurality of printer head from described Print All machine shower nozzle before, also comprises:
Obtain the positional information of each printer head in described Print All machine shower nozzle and the colouring information corresponding with this positional information.
4. method according to claim 3, is characterized in that, the material that described a plurality of printer heads are squeezed out carries out heat fused, prints described model and comprise:
Current time is carried out heat fused by the material that described a plurality of printer heads squeeze out;
Be cured with filling the material of track after with heat fused according to the cross section profile of described model, and with the department pattern of having printed, carry out bonding.
5. method according to claim 1, is characterized in that, the quantity of described a plurality of printer heads is 3, and wherein, it is red, green, blue that the color of the material of filling in described each printer head is respectively.
6. method according to claim 1, is characterized in that, the quantity of described a plurality of printer heads is 3, and wherein, the color of the material of filling in described each printer head is respectively cyan, magenta, yellow.
7. a very color printing equipment, is characterized in that, comprising:
Control module, be used for the speed according to each printer head extruding material of a plurality of printer heads of color control of model to be processed, wherein, and the color inequality of the material of filling in described a plurality of printer heads;
Print module, the material that is used for described a plurality of printer heads are squeezed out carries out heat fused, prints described model.
8. device according to claim 7, is characterized in that, described control module comprises:
Choose unit, be used for choosing described a plurality of printer head according to the color of described model from Print All machine shower nozzle;
Determining unit, for determine the ratio of the color that described each printer head is filled according to the color of described model;
Computing unit, the ratio that is used for the definite color of employing is calculated the speed of described each printer head extruding material.
9. device according to claim 8, is characterized in that, described device also comprises: acquisition module;
Described acquisition module, for the positional information of each printer head that obtains described Print All machine shower nozzle and the colouring information corresponding with this positional information.
10. device according to claim 9, is characterized in that, described print module comprises:
Heating unit, be used for current time is carried out heat fused by the material that described a plurality of printer heads squeeze out;
Felting cell, be used for being cured with filling the material of track after with heat fused according to the cross section profile of described model, and with the department pattern of having printed, carry out bonding.
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| CN103692652A (en) * | 2013-12-18 | 2014-04-02 | 青岛尚慧信息技术有限公司 | 3D (three-dimensional) printing equipment |
| CN103802238A (en) * | 2014-02-26 | 2014-05-21 | 英华达（上海）科技有限公司 | Single-nozzle color feeding method and device for 3D (Three-Dimensional) printer |
| CN103895228A (en) * | 2014-03-31 | 2014-07-02 | 王利民 | Colored 3D (Three Dimensional) printing equipment using fused deposition modeling method |
| CN104129079A (en) * | 2014-08-07 | 2014-11-05 | 北京汇天威科技有限公司 | Novel 3D (3-dimentional) printer |
| CN104275799A (en) * | 2014-05-26 | 2015-01-14 | 深圳市七号科技有限公司 | Colored 3D printing device and method |
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| CN105881907A (en) * | 2016-05-10 | 2016-08-24 | 深圳达能美科技有限公司 | Colorful printing mechanism of 3D printer |
| CN107160671A (en) * | 2016-03-02 | 2017-09-15 | 珠海赛纳打印科技股份有限公司 | The preparation method and system of a kind of color 3D object |
| CN108215161A (en) * | 2017-03-07 | 2018-06-29 | 桂林凯歌信息科技有限公司 | The full-color 3D printer device of Quick-forming and its Method of printing |
| CN110253925A (en) * | 2019-05-17 | 2019-09-20 | 黑金刚（福建）自动化科技股份公司 | A kind of vamp 3D printing method and its equipment based on shoe tree |
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| CN105095554A (en) * | 2014-05-24 | 2015-11-25 | 张亮 | Method for manufacturing multi-colored model by utilizing linear material |
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