CN109774151B - Optimization method for dip coloring of powder-based 3D printed part - Google Patents
Optimization method for dip coloring of powder-based 3D printed part Download PDFInfo
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- CN109774151B CN109774151B CN201910134116.7A CN201910134116A CN109774151B CN 109774151 B CN109774151 B CN 109774151B CN 201910134116 A CN201910134116 A CN 201910134116A CN 109774151 B CN109774151 B CN 109774151B
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Abstract
The invention discloses an optimization method for dip coloring of a powder-based 3D printed part, which comprises the following steps: the method comprises the steps of package fixing, impregnation scheme determining, impregnation drying, difference value recording and detecting. The optimization method provided by the invention adopts the rubber band group with the nodes to wrap and fix the powder-based 3D printing piece, so that the dipping area and sequence are determined, and the dipping layer thickness detection method is combined, so that the uniformity of the surface coloring of the 3D printing piece is rapidly and accurately controlled to improve the dipping coloring effect.
Description
Technical Field
The invention relates to the field of 3D printing, in particular to an optimization method for dip coloring of a powder-based 3D printed part.
Background
The 3D printing technology is used as a digital manufacturing technology with industrial revolutionary property, and is more and more widely applied to the personalized customization fields of industrial design, cultural originality, clothes, shoes and the like. The 3D printing technology is originally originated from a single-color powder-based 3D ink-jet printing invention patent applied by the Massachusetts institute of technology, and 3D printing services and applications with various characteristics are developed along with different printing processes and printing substrates, wherein the color 3D printing application is a very popular subdivision field.
The color 3D printing technology can be divided into mainstream 3D printing technologies such as full-color powder-based 3D printing, full-color plastic-based 3D printing, full-color paper-based 3D printing and the like from the angle of printing a base material, wherein the full-color powder-based 3D printing is most widely applied. The full-color powder-based 3D printing is mainly a technology that transparent gypsum powder particles are bonded and formed in transparent glue in each layer printing process, and color adhesives are sprayed and printed on the edges of layered outlines until a color three-dimensional model is printed. However, due to the influences of factors such as the size limit of gypsum powder particles in the existing layering, the difficulty in fine control of the thickness of the color adhesive, the lack of a post-processing method of a printing model and the like, the surface color reproduction of a 3D printing piece in the complex customized application of the powder-based 3D printing process is not ideal.
At present, the post-processing technology of a color 3D printed piece mainly includes polishing, sand blasting and coloring, wherein the coloring processing technology mainly includes specific methods such as manual color tracing, dipping, wax spraying and the like. The impregnation is a very quick and convenient 3D printing piece color post-processing method, and is suitable for industrialized popularization of full-color 3D printing in different fields. In the aspect of surface impregnation treatment of the powder-based 3D printing piece, a brush type impregnation method, a device and a new impregnation liquid formula are provided in patent CN201510190934.0, namely 'an optimization method for color reproduction of a powder-based 3D printing finished product', but the impregnation time required by the super-large-size 3D printing piece is very long and is difficult to meet the requirement of batch production. In the aspect of surface dipping treatment of full-color paper-based 3D printed pieces, the 'method for optimizing the surface color vividness of wine packaging models printed by paper-based 3D' according to the published patent CN201711322078.5 provides an optimization method combining water-based wax dipping and water-based white glue coating, but the method is not generally applicable to surface treatment of powder-based 3D printed pieces.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide an optimization method for dip coloring of a powder-based 3D printing piece, the method adopts a rubber band group with nodes to wrap and fix the powder-based 3D printing piece, so that a dip area and a dip sequence are determined, and by combining a dip layer thickness detection method, the uniformity of surface coloring of the 3D printing piece is rapidly and accurately controlled to improve the dip coloring effect.
The purpose of the invention is realized by adopting the following technical scheme:
an optimization method for dip coloring of a powder-based 3D printing member comprises the following steps:
and (3) a wrapping and fixing step: according to the shape and the size of the powder-based 3D printed piece, a rubber band group with nodes is selected to wrap and fix the 3D printed piece;
an impregnation scheme determining step: determining the surface area and sequence of batch impregnation according to the wrapping scheme of the rubber band group with the nodes;
and (3) dipping and drying: hooking nodes at two ends of a target impregnation area by using two iron wire hooks respectively, slowly placing the 3D printing piece into a soft disc made of rubber filled with impregnation liquid, controlling the two iron wire hooks to do vertical dislocation motion for 5-8 times, taking the 3D printing piece out of the liquid level, and drying by using hot air with a porous groove;
recording a difference value: placing the edge of the impregnation area after each drying at a position 4-6 cm away from a soft light detection device with 5-10 longitudinal LED lamp combinations, observing the thickness change of a transparent layer on the surface of the impregnation area from top to bottom, and recording the area with large change;
a detection step: and (3) sequentially carrying out dipping, drying and detection according to the set dipping area and sequence, determining the difference value of the thickness of the transparent layer on the surface of each dipping area relative to the thickness of the transparent layer formed by the last dipping, and comparing the difference value with a set threshold value to determine whether the dipping is needed again.
Furthermore, in the wrapping and fixing step, the rubber band group with the nodes is of a rhombic net structure formed by weaving 4-6 rubber bands with the nodes at equal intervals in a longitudinal and transverse mode.
Further, in the step of determining the dipping scheme, the wrapping scheme of the rubber band group with the node is selected from an end wrapping type, a half wrapping type or a full wrapping type according to the size of the 3D printing piece and the wrapped area rate.
Further, the size of the 3D print is classified into small, medium and large sizes according to its model volume, and the small model volume is less than 125cm3Large model with volume greater than 1000cm3The medium model volume lies between the small and large sizes.
Further, the wrapped area ratio is 1/2, 1/5, or 1/10, which is a ratio of the wrapped area of the 3D print to the entire area visually judged.
Further, in the dipping and drying step, the soft disc made of the rubber material is a boat-shaped shallow disc, the long axis of the shallow disc is 12 cm-20 cm, and the short axis of the shallow disc is 6 cm-12 cm.
Further, in the step of dipping and drying, the temperature of hot air blowing drying is 30-50 ℃ and the time is 20-40 s.
Further, in the detection step, the set threshold value is 0.1mm, and when the threshold value is smaller than the threshold value, the re-immersion is required, and when the threshold value is larger than the threshold value, the re-immersion is not required.
Compared with the prior art, the invention has the beneficial effects that:
the optimization method for the dipping and coloring of the powder-based 3D printing piece is characterized in that a rubber band group with nodes is adopted to wrap and fix the powder-based 3D printing piece, a dipping area and a dipping sequence are determined according to the method, and the uniformity of the surface coloring of the 3D printing piece is rapidly and accurately controlled to improve the dipping and coloring effect by combining the thickness detection method of the dipping layer; can realize the colored homogeneity control of powder base 3D printing piece flooding and improve with more succinct mode, the required flooding liquid total amount that holds when can also greatly reduce every powder base 3D printing piece flooding, both can be arranged in the colored mass production flow of powder base 3D printing piece flooding, can satisfy the colored homogeneity of powder base 3D printing piece flooding and efficiency synchronous optimization again of more complicated structure.
Drawings
Fig. 1 is a flow chart of an optimized method for dip coloring a powder-based 3D print according to the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
Referring to fig. 1, an optimized method for dip coloring a powder-based 3D print includes the steps of:
and (3) a wrapping and fixing step: according to the shape and the size of the powder-based 3D printed piece, a rubber band group with nodes is selected to wrap and fix the 3D printed piece;
an impregnation scheme determining step: determining the surface area and sequence of batch impregnation according to the wrapping scheme of the rubber band group with the nodes;
and (3) dipping and drying: hooking nodes at two ends of a target impregnation area by using two iron wire hooks respectively, slowly placing the 3D printing piece into a soft disc made of rubber filled with impregnation liquid, controlling the two iron wire hooks to do vertical dislocation motion for 5-8 times, taking the 3D printing piece out of the liquid level, and drying by using hot air with a porous groove;
recording a difference value: placing the edge of the impregnation area after each drying at a position 4-6 cm away from a soft light detection device with 5-10 longitudinal LED lamp combinations, observing the thickness change of a transparent layer on the surface of the impregnation area from top to bottom, and recording the area with large change;
a detection step: and (3) sequentially carrying out dipping, drying and detection according to the set dipping area and sequence, determining the difference value of the thickness of the transparent layer on the surface of each dipping area relative to the thickness of the transparent layer formed by the last dipping, and comparing the difference value with a set threshold value to determine whether the dipping is needed again.
In a further implementation mode, in the wrapping and fixing step, the rubber band group with the nodes is a rhombic net structure formed by weaving 4-6 rubber bands with the nodes at equal intervals in a longitudinal and transverse mode.
As a further embodiment, in the dipping scheme determining step, the wrapping scheme of the rubber band set with the node is selected from an end wrapping type, a half wrapping type or a full wrapping type according to the size of the 3D print and the wrapped area ratio.
As a further embodiment, the 3D print size is divided into small, medium and large sizes according to its model volume, the small model volume being less than 125cm3Large model with volume greater than 1000cm3The medium model volume lies between the small and large sizes.
As a further embodiment, the wrapped area ratio is 1/2, 1/5, or 1/10, i.e., the ratio of the wrapped area of the 3D print to the total area is visually judged.
In a further embodiment, in the dipping and drying step, the flexible disk made of rubber is a boat-shaped tray, and the tray has a major axis of 12 to 20cm and a minor axis of 6 to 12 cm.
In a further embodiment, in the step of dipping and drying, the temperature of hot air blowing for drying is 30-50 ℃ for 20-40 s.
In a further embodiment, the threshold value set in the detection step is 0.1mm, and when the threshold value is smaller than the threshold value, re-immersion is required, and when the threshold value is larger than the threshold value, re-immersion is not required.
In the wrapping and fixing step, an elastic rhombic net structure formed by a rubber band group fixing device with nodes is in full contact with the surface of the powder-based 3D printing piece, and the nodes in the transverse and longitudinal directions can prevent sliding and improve the fixing stability; meanwhile, the rhombic elastic net-shaped structure is hollow, so that most of the surface of the 3D printing piece can be kept in direct contact with the impregnation liquid in the impregnation process without loosening.
In the step of confirming the flooding scheme, the elastic rhombus network structure that the fixed parcel scheme of rubber band group of taking the node formed had both had elasticity and had the fretwork, can carry out local key position parcel to powder base 3D printing piece of different models and size of a dimension, and then the fine structure and the dimensional change adaptability of protection powder base 3D printing piece.
In the dipping and drying step, the method for controlling dipping through the malposition movement of the two iron wire hooks can provide that the surface of the powder-based 3D printing piece moves up and down relatively in the dipping solution, so that the dipping solution is driven to convect, more uniform concentrations of the upper layer dipping solution and the lower layer dipping solution are provided in the dipping process, and the problem of nonuniformity of the surface of the powder-based 3D printing piece caused by the difference of dipping depths is solved.
In the step of recording the difference value, the dipping liquid level can be provided at any time for judging the dipping effect when the thickness of the dipped transparent layer of the powder-based 3D printing piece is detected, compared with the detection method adopting a special transparency measuring instrument, the detection method is convenient and quick, and the detection speed and the detection convenience of the surface dipping uniformity of the 3D printing piece are improved.
Example 1:
an optimization method for dip coloring of a powder-based 3D printing member comprises the following steps:
and (3) a wrapping and fixing step: according to the shape and the size of the powder-based 3D printing piece, selecting a rubber band group with nodes to wrap and fix the 3D printing piece, wherein the rubber band group with the nodes is a rhombic net structure formed by weaving 4-6 rubber bands with the nodes in a vertically and horizontally equal interval mode;
an impregnation scheme determining step: determining the surface area and sequence of batch impregnation according to the wrapping scheme of the rubber band group with the nodes; selecting an end wrapping type, a half wrapping type or a full wrapping type according to the 3D printing piece size and the wrapped area rate by using the wrapping scheme of the rubber band group with the node;
and (3) dipping and drying: hooking nodes at two ends of a target impregnation area by using two iron wire hooks respectively, slowly placing a 3D printing piece into a rubber floppy disc filled with impregnation liquid, wherein the rubber floppy disc is a boat-shaped shallow disc, the long axis of the shallow disc is 12-20 cm, the short axis of the shallow disc is 6-12 cm, controlling the two iron wire hooks to perform vertical dislocation motion for 5-8 times, taking the 3D printing piece out of the liquid level, and drying the 3D printing piece by using hot air with a porous groove at the temperature of 30-50 ℃ for 20-40 s;
recording a difference value: placing the edge of the impregnation area after each drying at a position 4-6 cm away from a soft light detection device with 5-10 longitudinal LED lamp combinations, observing the thickness change of a transparent layer on the surface of the impregnation area from top to bottom, and recording the area with large change;
a detection step: and (3) sequentially carrying out soaking, drying and detection according to the set soaking area and sequence, determining the difference value of the thickness of the transparent layer on the surface of each soaking area relative to the thickness of the transparent layer formed by the last soaking, and comparing the difference value with a set threshold value to determine whether to need to be soaked again, wherein the set threshold value is 0.1mm, the second soaking is needed when the threshold value is smaller than the threshold value, and the second soaking is not needed when the threshold value is larger than the threshold value.
Wherein the 3D printing piece is divided into small, medium and large sizes according to the model volume, and the small model volume is less than 125cm3Large model with volume greater than 1000cm3A medium model volume between the small and large sizes; the wrapped area ratio is 1/2, 1/5 or 1/10, and the wrapped area ratio is the ratio of the wrapped area of the 3D print to the entire area visually judged.
In this embodiment, the powder-based 3D printed material is an irregular structure model with a large size, and the parameters determined by the above optimization method are as follows: the rubber band group with the nodes is preferably a rhombic net structure formed by weaving 6 rubber bands with the nodes at equal intervals in a longitudinal and transverse mode; the wrapping scheme of the rubber band group with the nodes is in an end wrapping type; the soft disc made of rubber is preferably a boat-shaped shallow disc with a long axis of 20cm and a short axis of 12 cm; the two iron wire hooks controlled by two hands do up-and-down dislocation movement for preferably 8 times; the hot air blowing drying temperature with the porous slot is preferably 50 ℃ and the drying time is preferably 40 s; the soft light detection device is preferably a longitudinal combination of 10 LED lamps, and the detection distance is preferably 4 cm.
Example 2:
an optimization method for dip coloring of a powder-based 3D printing member comprises the following steps:
and (3) a wrapping and fixing step: according to the shape and the size of the powder-based 3D printing piece, selecting a rubber band group with nodes to wrap and fix the 3D printing piece, wherein the rubber band group with the nodes is a rhombic net structure formed by weaving 4-6 rubber bands with the nodes in a vertically and horizontally equal interval mode;
an impregnation scheme determining step: determining the surface area and sequence of batch impregnation according to the wrapping scheme of the rubber band group with the nodes; selecting an end wrapping type, a half wrapping type or a full wrapping type according to the 3D printing piece size and the wrapped area rate by using the wrapping scheme of the rubber band group with the node;
and (3) dipping and drying: hooking nodes at two ends of a target impregnation area by using two iron wire hooks respectively, slowly placing a 3D printing piece into a rubber floppy disc filled with impregnation liquid, wherein the rubber floppy disc is a boat-shaped shallow disc, the long axis of the shallow disc is 12-20 cm, the short axis of the shallow disc is 6-12 cm, controlling the two iron wire hooks to perform vertical dislocation motion for 5-8 times, taking the 3D printing piece out of the liquid level, and drying the 3D printing piece by using hot air with a porous groove at the temperature of 30-50 ℃ for 20-40 s;
recording a difference value: placing the edge of the impregnation area after each drying at a position 4-6 cm away from a soft light detection device with 5-10 longitudinal LED lamp combinations, observing the thickness change of a transparent layer on the surface of the impregnation area from top to bottom, and recording the area with large change;
a detection step: and (3) sequentially carrying out soaking, drying and detection according to the set soaking area and sequence, determining the difference value of the thickness of the transparent layer on the surface of each soaking area relative to the thickness of the transparent layer formed by the last soaking, and comparing the difference value with a set threshold value to determine whether to need to be soaked again, wherein the set threshold value is 0.1mm, the second soaking is needed when the threshold value is smaller than the threshold value, and the second soaking is not needed when the threshold value is larger than the threshold value.
Wherein the 3D printing piece is divided into small, medium and large sizes according to the model volume, and the small model volume is less than 125cm3Large model with volume greater than 1000cm3A medium model volume between the small and large sizes; the wrapped area ratio is 1/2, 1/5 or 1/10, and the wrapped area ratio is the ratio of the wrapped area of the 3D print to the entire area visually judged.
In this embodiment, the powder-based 3D printed material is a medium-sized structural model, and the parameters determined by the above optimization method are as follows: the rubber band group with the nodes is preferably a rhombic net structure formed by weaving 5 rubber bands with the nodes at equal intervals in a longitudinal and transverse direction; the wrapping scheme of the rubber band group with the nodes is preferably in a half-wrapping mode; the soft disc made of rubber is preferably a boat-shaped shallow disc with a long axis of 16cm and a short axis of 9 cm; the two iron wire hooks controlled by two hands do up-and-down dislocation movement for preferably 7 times; the hot air blowing drying temperature with the porous slot is preferably 40 ℃ and the drying time is preferably 30 s; the soft light detection device preferably comprises 7 LED lamps which are longitudinally combined, and the detection distance of the soft light detection device is preferably 5 cm.
Example 3:
an optimization method for dip coloring of a powder-based 3D printing member comprises the following steps:
and (3) a wrapping and fixing step: according to the shape and the size of the powder-based 3D printing piece, selecting a rubber band group with nodes to wrap and fix the 3D printing piece, wherein the rubber band group with the nodes is a rhombic net structure formed by weaving 4-6 rubber bands with the nodes in a vertically and horizontally equal interval mode;
an impregnation scheme determining step: determining the surface area and sequence of batch impregnation according to the wrapping scheme of the rubber band group with the nodes; selecting an end wrapping type, a half wrapping type or a full wrapping type according to the 3D printing piece size and the wrapped area rate by using the wrapping scheme of the rubber band group with the node;
and (3) dipping and drying: hooking nodes at two ends of a target impregnation area by using two iron wire hooks respectively, slowly placing a 3D printing piece into a rubber floppy disc filled with impregnation liquid, wherein the rubber floppy disc is a boat-shaped shallow disc, the long axis of the shallow disc is 12-20 cm, the short axis of the shallow disc is 6-12 cm, controlling the two iron wire hooks to perform vertical dislocation motion for 5-8 times, taking the 3D printing piece out of the liquid level, and drying the 3D printing piece by using hot air with a porous groove at the temperature of 30-50 ℃ for 20-40 s;
recording a difference value: placing the edge of the impregnation area after each drying at a position 4-6 cm away from a soft light detection device with 5-10 longitudinal LED lamp combinations, observing the thickness change of a transparent layer on the surface of the impregnation area from top to bottom, and recording the area with large change;
a detection step: and (3) sequentially carrying out soaking, drying and detection according to the set soaking area and sequence, determining the difference value of the thickness of the transparent layer on the surface of each soaking area relative to the thickness of the transparent layer formed by the last soaking, and comparing the difference value with a set threshold value to determine whether to need to be soaked again, wherein the set threshold value is 0.1mm, the second soaking is needed when the threshold value is smaller than the threshold value, and the second soaking is not needed when the threshold value is larger than the threshold value.
Wherein the 3D print is sized according to its dieThe volume integral is small, medium and large, and the volume of the small model is less than 125cm3Large model with volume greater than 1000cm3A medium model volume between the small and large sizes; the wrapped area ratio is 1/2, 1/5 or 1/10, and the wrapped area ratio is the ratio of the wrapped area of the 3D print to the entire area visually judged.
The powder-based 3D printed material of this embodiment is a regular structural model of small size, and the parameters determined by the above optimization method are as follows: the rubber band group with the nodes is preferably a rhombic net structure formed by weaving 4 rubber bands with the nodes at equal intervals in a longitudinal and transverse direction; the wrapping scheme of the rubber band group with the nodes is preferably in a full wrapping mode; the soft disc made of rubber is preferably a boat-shaped shallow disc with a long axis of 12cm and a short axis of 6 cm; the two iron wire hooks controlled by two hands do up-and-down dislocation movement for preferably 5 times; the hot air blowing drying temperature with the porous slot is preferably 30 ℃ and the drying time is preferably 20 s; the soft light detection device is preferably a longitudinal combination of 5 LED lamps, and the detection distance is preferably 6 cm.
In conclusion, the optimization method of the invention provides a rubber band group fixing device, a wrapping scheme and a method for detecting the thickness of the impregnated transparent layer for controlling and detecting the uniform coloring of the surface of the powder-based 3D printing piece in the impregnation process, and the proposed double-iron-wire-hook dislocation motion control impregnation method improves the concentration uniformity of the contact impregnation liquid on the surface of the powder-based 3D printing piece, can meet the uniform impregnation requirements of different impregnation areas, further does not need a large amount of impregnation liquid to completely submerge and impregnate the powder-based 3D printing piece, and reduces the volatilization and total consumption of the impregnation liquid in the impregnation process.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (8)
1. An optimization method for dip coloring of a powder-based 3D printing member is characterized by comprising the following steps:
and (3) a wrapping and fixing step: according to the shape and the size of the powder-based 3D printed piece, a rubber band group with nodes is selected to wrap and fix the 3D printed piece;
an impregnation scheme determining step: determining the surface area and sequence of batch impregnation according to the wrapping scheme of the rubber band group with the nodes;
and (3) dipping and drying: hooking nodes at two ends of a target impregnation area by using two iron wire hooks respectively, slowly placing the 3D printing piece into a soft disc made of rubber filled with impregnation liquid, controlling the two iron wire hooks to do vertical dislocation motion for 5-8 times, taking the 3D printing piece out of the liquid level, and drying by using hot air with a porous groove;
recording a difference value: placing the edge of the impregnation area after each drying at a position 4-6 cm away from a soft light detection device with 5-10 longitudinal LED lamp combinations, observing the thickness change of the transparent layer on the surface of the impregnation area from top to bottom, recording the area with large change, and obtaining the thickness of the transparent layer on the surface of the impregnation area according to the thickness of the area with large change of the transparent layer;
a detection step: and (3) sequentially carrying out dipping, drying and detection according to the set dipping area and sequence, determining the difference value of the thickness of the transparent layer on the surface of each dipping area relative to the thickness of the transparent layer formed by the last dipping, and comparing the difference value with a set threshold value to determine whether the dipping is needed again.
2. The method for optimizing the dipping coloring of the powder-based 3D printed material according to claim 1, wherein in the wrapping and fixing step, the rubber band group with the nodes is a rhombic net structure formed by weaving 4-6 rubber bands with the nodes at equal intervals in a longitudinal and transverse mode.
3. The method for optimizing impregnation coloring of a powder-based 3D print according to claim 1, wherein in the impregnation scheme determining step, the wrapping scheme of the rubber band set with nodes is selected from an end wrapping type, a half wrapping type or a full wrapping type according to the size of the 3D print and the wrapped area ratio.
4. Method for optimizing the dip-coloring of powder-based 3D prints according to claim 3, characterized in that the 3D print size is determined by its model volume fractionIs small, medium and large, and the small model has a volume less than 125cm3Large model with volume greater than 1000cm3The medium model volume lies between the small and large sizes.
5. The method for optimizing dip coloring of a powder-based 3D print according to claim 3, wherein the wrapped area ratio is 1/2, 1/5 or 1/10, and the wrapped area ratio is a ratio of the wrapped area of the 3D print to the entire area visually judged.
6. The method for optimizing the dip coloring of a powder-based 3D print according to claim 1, wherein in the dip drying step, the flexible disk made of rubber is a boat-shaped tray having a major axis of 12cm to 20cm and a minor axis of 6cm to 12 cm.
7. The optimized method for dip-coloring a powder-based 3D print according to claim 1, wherein in the step of dip-drying, the temperature of hot air drying is 30-50 ℃ for 20-40 s.
8. The method for optimizing dip coloring of powder-based 3D prints according to claim 1, characterized in that in the detection step a threshold value is set of 0.1mm, below which a further dip is required and above which no further dip is required.
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| US20160243721A1 (en) * | 2015-02-23 | 2016-08-25 | Barristo Enterprises Inc. | Method for Strengthening 3D Printed Components |
| CN204523426U (en) * | 2015-03-20 | 2015-08-05 | 温岭市达克罗涂复工业有限公司 | Dacroment dip-coating centrifugal basket |
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