Surface treatment device and method for stain-resistant down feather

Abstract

The invention relates to a stain-resistant down feather surface treatment device and method, and relates to the technical field of garment production, the stain-resistant down feather surface treatment device comprises an extrusion box and a vacuum box located on the side of the extrusion box, and the extrusion box is internally provided with at least one set of extrusion assemblies used for smearing stain-resistant treatment liquid and conducting two-way extrusion on down feather; an ultrasonic assembly used for driving the extrusion assembly to vibrate is further arranged in the extrusion box. A plurality of feeding mechanisms in one-to-one correspondence with the extrusion assemblies are arranged on the side face of the extrusion box, the portion, located at the extrusion assemblies, of the extrusion box is sleeved with an airflow pipe fitting used for flattening down feather through airflow, preliminarily drying the down feather and conveying the down feather into the vacuum box, and a driving mechanism used for driving the extrusion assemblies to move is further arranged on the other side face of the extrusion box; and a plurality of vacuum cavities which are in one-to-one correspondence with the extrusion assemblies and are used for further drying the down feather are formed in the vacuum box. According to the device, the permeation effect of the treatment liquid is better, the overall stain resistance of down feather is effectively improved, and the stain resistance effect is more durable.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of garment production, and particularly relates to a surface treatment device and method for stain-resistant down. BACKGROUND

[0002] The stain-resistant down has the advantages of strong stain resistance, easy cleaning and maintained warmth retention performance, and a barrier difficult to be penetrated by stains is formed on the surface of the down, so that the down can effectively resist the adhesion of various stains such as oil stains, water stains and soil, even if the down is stained with stains, the stains are difficult to penetrate into the inside due to the stain-resistant layer on the surface, so that the down is easier to clean and is less likely to leave marks, and the stain-resistant treatment of the down does not damage the warmth retention performance of the down, but can prolong the service life of the down because of the reduction of damage to the down caused by frequent cleaning.

[0003] However, the existing stain-resistant surface treatment device is difficult to fully press the stain-resistant treatment liquid into the deep part of the down pores, and most of the treatment liquid can only be attached to the surface of the down fiber or enter the shallow surface layer area, and cannot penetrate into the core area of the fiber, so that the stain-resistant effect is not durable, and the treatment liquid is prone to be lost after being used or washed for many times, and the stain-resistant performance is reduced, in order to make the treatment liquid penetrate into the down fiber as much as possible, the existing treatment device usually needs a long treatment time, such as long-time soaking or repeated treatment for many times, which not only increases the time cost of the production process, but also reduces the production efficiency, and the existing device is prone to uneven penetration, because the form and distribution of the down have a certain randomness, the treatment device is difficult to ensure the penetration degree of the treatment liquid on each down fiber, and the overall treatment effect is affected.

[0004] Therefore, the application provides a surface treatment device and method for stain-resistant down to solve the above problems. SUMMARY

[0005] The application aims to solve the problems in the background art, and provides a surface treatment device and method for stain-resistant down.

[0006] The application achieves the above-mentioned purpose through the following technical solutions: A surface treatment device for stain-resistant down comprises an extrusion box and a vacuum box located on the side of the extrusion box. The interior of the extrusion box is provided with at least one group of extrusion components for applying a stain-resistant treatment liquid and bidirectionally extruding the down. The interior of the extrusion box is also provided with an ultrasonic component for driving the extrusion component to vibrate. The side of the extrusion box is provided with a plurality of feeding mechanisms corresponding one-to-one to the extrusion components. The exterior of the extrusion box located at the extrusion component is provided with an airflow pipe for flattening the down, preliminarily drying the down, and transporting the down to the vacuum box. The other side of the extrusion box is also provided with a driving mechanism for driving the extrusion component to move. The interior of the vacuum box is provided with a plurality of vacuum cavities corresponding one-to-one to the extrusion components for further drying the down.

[0007] As a further optimization solution of the present invention, the extrusion assembly includes two extrusion plates, one above and one below; a frame connected to the driving mechanism is provided on the side of the two extrusion plates, and a first spring is provided between the frame and the extrusion plates.

[0008] As a further optimization scheme of the present invention, the ultrasonic component includes an ultrasonic generator fixed on the top of the extrusion box and a vibration plate connected to the vibration output end of the ultrasonic generator; the vibration plate is inserted into the extrusion box and abuts against multiple extrusion plates, and a third spring is provided between the vibration plate and the inner wall of the extrusion box.

[0009] As a further optimization scheme of the present invention, an elastic liquid storage bag is provided inside the extrusion plate, a liquid inlet pipe is provided on one side of the extrusion plate, and a plurality of liquid outlet holes evenly distributed in a lattice shape are provided on the other side, and the liquid inlet pipe and the liquid outlet holes are both connected to the elastic liquid storage bag; the outlet of the liquid outlet hole is provided with a wedge block for sealing, and the extrusion plate is provided with a wedge groove matching the wedge block, and a second spring is fixed on the wedge block, and the other end of the second spring is fixed with an extrusion block abutting the elastic liquid storage bag.

[0010] As a further optimization solution of the present invention, the feeding mechanism includes a metering cylinder and a wind cover hingedly arranged on the top of the metering cylinder, and a feeding pipe inserted into the extrusion box is provided at the bottom of the metering cylinder.

[0011] As a further optimization solution of the present invention, an outlet movable plate is hingedly provided on one side of the extrusion box close to the vacuum box, a closing plate for opening and closing the vacuum chamber is provided on the side of the outlet movable plate, and a cylinder for driving the closing plate to rise and fall is provided above the closing plate.

[0012] As a further optimization scheme of the present invention, a scraping and discharging mechanism is provided in the vacuum chamber, and the scraping and discharging mechanism includes a slider sliding in a slide groove on the top surface of the vacuum chamber; a first magnet and a second magnet with opposite magnetic properties are respectively provided on both sides of the slider, a movable rod is fixedly provided at the bottom of the first magnet, a scraper is fixedly provided at the bottom end of the movable rod, and a fixed block for inserting the movable rod is also fixedly provided below the first magnet, and a fourth spring is sleeved on the movable rod between the fixed block and the first magnet.

[0013] As a further optimization scheme of the present invention, the scraping and discharging mechanism also includes a sliding seat slidingly arranged in the sorting chamber above the vacuum chamber; a third magnet and a fourth magnet with the same magnetic properties as the first magnet are respectively provided at both ends of the bottom of the sliding seat, and a push-pull handle is provided on the top of the sliding seat.

[0014] The present invention also provides a surface treatment method for stain-resistant down, comprising the following steps: S1. Place the down to be processed into the feeding mechanism, and then transport it to the extrusion assembly through airflow. Then, activate the four airflow pipes around the extrusion box to suspend and flatten the down under the action of the airflow; S2. Applying a stain-resistant treatment liquid to the down through an extrusion component and bidirectionally squeezing the down so that the stain-resistant treatment liquid is squeezed into the down fibers. During this process, the extrusion component is driven to vibrate by an ultrasonic component so that the stain-resistant treatment liquid can further penetrate into the down fibers. After the extrusion is completed, hot air is output through the airflow pipe to preliminarily dry the down. S3, repeat step S2 multiple times; S4. The air flow pipe on the opposite side of the vacuum box is started again to transport the preliminarily dried down to the vacuum box for further drying through the air flow.

[0015] The beneficial effects of the present invention are: 1. The present invention provides a squeezing box and a vacuum box. The down is first squeezed to allow the stain-resistant treatment liquid to penetrate into the down fibers, and then preliminarily dried by hot air. The down is then further dried by vacuum heating and setting. This allows the treatment liquid to penetrate better, effectively improving the overall stain resistance of the down and making the stain resistance more lasting. The secondary heating and setting can fix the shape of the down and make the structure more stable. At the same time, the vacuum heating and setting can keep the down in a good shape and fluffiness.

[0016] 2. The present invention provides an extrusion component and an ultrasonic component, which can drive the automatic feeding of the anti-fouling treatment liquid through the extrusion component, squeeze the anti-fouling treatment liquid into the down fibers, and use the ultrasonic component to make the anti-fouling treatment liquid vibrate violently, breaking the agglomeration of the anti-fouling treatment liquid. At the same time, it can also reduce the surface tension of the down fibers, which is beneficial to the adsorption of the anti-fouling treatment liquid, improve the adsorption capacity of the anti-fouling treatment liquid, and improve the surface treatment effect of the down.

[0017] 3. The present invention facilitates the transportation, drying, and stirring of down by providing an airflow pipe, thereby improving the production efficiency of the device. After the extrusion action is completed, gas is ejected through multiple nozzles of the airflow pipe to suspend the down in the cavity between the two extrusion plates. Driven by the airflow, the down and the treatment liquid collide and mix with each other, further improving the treatment effect of the treatment liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A three-dimensional schematic diagram of the overall structure of the present invention Figure 1 ; Figure 2 A three-dimensional schematic diagram of the overall structure of the present invention Figure 2 ; Figure 3 Schematic diagram of the internal structure of the extrusion box and vacuum box of the present invention; Figure 4 It is a schematic structural diagram of the extrusion assembly of the present invention; Figure 5 It is a front cross-sectional view of the extruded plate structure of the present invention; Figure 6 This is a schematic structural diagram of the ultrasonic component of the present invention; Figure 7 This is a schematic diagram of the connection structure between the extrusion box and the vacuum box of the present invention; Figure 8 It is a structural schematic diagram of the scraping and discharging mechanism of the present invention.

[0019] In the picture: 1. Extrusion box; 101. Outlet movable plate; 2. Vacuum box; 201. Vacuum chamber; 202. Arrangement chamber; 203. Closing plate; 204. Cylinder; 3. Extrusion assembly; 301. Extrusion plate; 302. Frame; 303. First spring; 304. Liquid inlet pipe; 305. Elastic liquid storage capsule; 306. Liquid outlet; 307. Wedge block; 308. Extrusion block; 309. Second spring; 4. Ultrasonic assembly; 401. Ultrasonic generator; 402. Vibrating plate; 403, third spring; 5, feeding mechanism; 501, metering cylinder; 502, feeding pipe; 503, air hood; 6, air flow pipe; 7, driving mechanism; 8, scraping and discharging mechanism; 801, slider; 802, first magnet; 803, second magnet; 804, fixed block; 805, movable rod; 806, scraper; 807, fourth spring; 808, sliding seat; 809, third magnet; 810, fourth magnet; 811, push-pull handle. DETAILED DESCRIPTION

[0020] The present application is described in further detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technicians in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0021] Example 1 In order to solve the problem that existing down surface treatment devices often have difficulty in fully pressing the anti-fouling treatment liquid into the deep pores of down fibers, resulting in insufficient durability of the anti-fouling effect and prone to uneven penetration, which affects the overall treatment effect, please refer to Figure 1-Figure 3 The present invention provides a surface treatment device for stain-resistant down, comprising an extrusion box 1 and a vacuum box 2 located on the side of the extrusion box 1. The extrusion box 1 is provided with at least one group of extrusion components 3 for applying stain-resistant treatment liquid and bidirectionally extruding the down; a plurality of feeding mechanisms 5 corresponding to the extrusion components 3 are provided on the side of the extrusion box 1; an airflow pipe 6 for flattening the down, preliminarily drying the down, and transporting the down into the vacuum box 2 is provided on the outside of the extrusion box 1 located at the extrusion components 3; a driving mechanism 7 for driving the extrusion component 3 to move is further provided on the other side of the extrusion box 1, and the driving mechanism 7 can be specifically set as a screw mechanism; a plurality of vacuum chambers 201 corresponding to the extrusion components 3 for further drying the down are provided inside the vacuum box 2, and a heating component is provided in the vacuum chamber 201.

[0022] like Figure 4-Figure 5 As shown, the extrusion assembly 3 includes two extrusion plates 301, one above and one below. A frame 302 connected to the drive mechanism 7 is provided on either side of each extrusion plate 301, with a first spring 303 interposed between the frame 302 and the extrusion plate 301. An elastic liquid reservoir 305 is provided within the extrusion plate 301. A liquid inlet pipe 304 is provided on one side of the extrusion plate 301, and a plurality of liquid outlet holes 306 evenly distributed in a lattice pattern are provided on the other side. Both the liquid inlet pipe 304 and the liquid outlet holes 306 are connected to the elastic liquid reservoir 305. A wedge block 307 is provided at the outlet of the liquid outlet hole 306 for blocking. The extrusion plate 301 is provided with a wedge-shaped groove that mates with the wedge block 307. A second spring 309 is fixed to the wedge block 307. The other end of the second spring 309 is fixed to an extrusion block 308 that abuts the elastic liquid reservoir 305.

[0023] In use, the two frame bodies 302 are simultaneously moved by the driving mechanism 7, and the two frame bodies 302 drive the respective pressing plates 301 to move. When the wedge-shaped block 307 is contacted by the down and is subjected to pressure, it moves into the wedge-shaped slot, the outlet of the liquid outlet hole 306 is exposed, the second spring 309 is compressed, the second spring 309 pushes the pressing block 308 to exert pressure on the elastic liquid storage bag 305, so that the stain-resistant treatment liquid in the elastic liquid storage bag 305 is discharged from the plurality of liquid outlet holes 306 and dripped onto the down. Under the action of the pressure, the gap between the down fibers is reduced, and the stain-resistant treatment liquid is squeezed into the down fibers under the action of the pressure difference.

[0024] In order to further improve the extrusion effect of the extrusion assembly 3, so that the stain-resistant treatment liquid can be more thoroughly squeezed into the down fibers, as shown in Figure 3 、 Figure 6 , the inside of the extrusion box 1 is also provided with an ultrasonic assembly 4 for driving the extrusion assembly 3 to vibrate. The ultrasonic assembly 4 includes an ultrasonic generator 401 fixed on the top of the extrusion box 1 and a vibration plate 402 connected with the vibration output end of the ultrasonic generator 401. The vibration plate 402 is inserted into the extrusion box 1 and abuts against the plurality of pressing plates 301. The third spring 403 is arranged between the vibration plate 402 and the inner wall of the extrusion box 1. In use, the ultrasonic generator 401 drives the vibration plate 402 to vibrate at a high frequency, and the vibration plate 402 drives the plurality of pressing plates 301 to vibrate at a high frequency. The high-frequency vibrating pressing plates 301 cause the stain-resistant treatment liquid to vibrate violently at a micro level, break the agglomeration of the stain-resistant treatment liquid, and reduce the surface tension of the down fibers, thereby destroying the adsorption relationship between the down and the pressing plates 301 and preventing the down from being easily attached to the pressing plates 301. This is beneficial to the adsorption of the stain-resistant treatment liquid, improves the adsorption force of the stain-resistant treatment liquid, and significantly improves the washing resistance of the down.

[0025] As shown in Figure 1 、 Figure 7 , the feeding mechanism 5 includes a metering cylinder 501 and a wind shield 503 hingedly arranged on the top of the metering cylinder 501. The bottom of the metering cylinder 501 is provided with a feeding pipe 502 inserted into the extrusion box 1. A certain volume of down is accurately measured by the metering cylinder 501, and then the wind shield 503 is covered. The airflow emitted by the wind shield 503 transports the down between the two pressing plates 301. The side of the extrusion box 1 close to the vacuum box 2 is hingedly provided with an outlet movable plate 101. The side of the outlet movable plate 101 is provided with a closing plate 203 for opening and closing the vacuum cavity 201. The upper side of the closing plate 203 is provided with an air cylinder 204 for driving the closing plate 203 to move up and down. After the extrusion is completed, the closing plate 203 is opened by the air cylinder 204, and the airflow pipe 6 on the side opposite to the vacuum box 2 is started. The airflow transports the preliminarily dried down into the vacuum cavity 201, and the airflow transportation ensures that the down is smoothly and efficiently transported to the vacuum box 2.

[0026] Example Two In order to improve the heat treatment setting effect of the down in the vacuum cavity 201, as shown in Figure 2-Figure 3 , Figure 8 , a scraping and discharging mechanism 8 is arranged in the vacuum cavity 201.

[0027] The scraping and discharging mechanism 8 comprises a sliding block 801 slidingly arranged in a sliding groove on the top surface of the vacuum cavity 201; first and second magnets 802 and 803 with opposite magnetic properties are arranged on the two sides of the sliding block 801, the first magnet 802 is slidingly arranged on the sliding block 801, a movable rod 805 is fixedly arranged at the bottom of the first magnet 802, a scraper 806 is fixedly arranged at the bottom end of the movable rod 805, a fixed block 804 for penetrating the movable rod 805 is further fixedly arranged below the first magnet 802, and a fourth spring 807 is sleeved on the movable rod 805 between the fixed block 804 and the first magnet 802. The scraping and discharging mechanism 8 further comprises a sliding seat 808 slidingly arranged in the arrangement cavity 202 above the vacuum cavity 201; third and fourth magnets 809 and 810 with the same magnetic properties as the first magnet 802 are arranged at the two ends of the bottom of the sliding seat 808, and a push-pull handle 811 is arranged at the top of the sliding seat 808.

[0028] In use, when the down in the vacuum cavity 201 needs to be scraped by the scraping and discharging mechanism 8, the third magnet 809 is placed above the second magnet 803, the second magnet 803 and the third magnet 809 are attracted to each other due to their opposite magnetic properties, the sliding seat 808 is moved by the push-pull handle 811, the components in the vacuum cavity 201 are moved by the sliding seat 808, and the down is laid flat by the scraper 806; when the down in the vacuum cavity 201 needs to be pushed out of the vacuum cavity 201 by the scraping and discharging mechanism 8, the third magnet 809 is placed above the first magnet 802, at this time, the fourth magnet 810 is just above the second magnet 803, the first magnet 802 and the third magnet 809 repel each other due to their same magnetic properties, the first magnet 802 descends along the sliding block 801, and then drives the movable rod 805 and the scraper 806 to descend, at this time, the fourth spring 807 is stretched, the scraper 806 contacts the inner bottom surface of the vacuum cavity 201, the fourth magnet 810 and the second magnet 803 are attracted to each other due to their opposite magnetic properties, the sliding seat 808 is moved by the push-pull handle 811, the components in the vacuum cavity 201 are moved by the sliding seat 808, and the down is pushed out of the vacuum cavity 201 by the scraper 806; the scraping and discharging mechanism 8 integrates the functions of laying down and discharging, so that the uniformity of vacuum heating setting is better, and the production efficiency is higher.

[0029] Embodiment Three The application further provides a surface treatment method for stain-resistant down, comprising the following steps: S1, the to-be-processed down is put into the feeding mechanism 5, then is conveyed to the extrusion assembly 3 through the airflow, then the four airflow pipes 6 around the extrusion box 1 are started to make the down float and lay flat under the action of the airflow; S2, the stain-resistant treatment liquid is applied to the down through the extrusion assembly 3, and the down is extruded bidirectionally to make the stain-resistant treatment liquid be extruded into the down fibers, during which the extrusion assembly 3 is vibrated by the ultrasonic assembly 4 to make the stain-resistant treatment liquid further penetrate into the down fibers, after the extrusion is completed, the hot air is output through the airflow pipe 6 to preliminarily dry the down, and the gas sprayed by the airflow pipe 6 makes the down float in the cavity between the two extrusion plates 301, under the push of the airflow, the down and the treatment liquid collide and mix with each other, and the treatment effect of the treatment liquid is further improved; S3, the step S2 is repeated for multiple times; S4, the airflow pipe 6 on the side opposite to the vacuum box 2 is started again, the preliminarily dried down is conveyed into the vacuum box 2 through the airflow, the down is scraped flat through the scraping and discharging mechanism 8, the down is further dried through the heating assembly, and finally the down is pushed out of the vacuum box 2 through the scraping and discharging mechanism 8.

[0030] The above embodiment only expresses one embodiment of the present application, and the description is more specific and detailed, but it cannot be understood as the limitation of the patent scope of the present application. It should be noted that, for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which belong to the protection scope of the present application.

Claims

1. A surface treatment device for stain-resistant down, comprising an extrusion box (1) and a vacuum box (2) located on the side of the extrusion box (1), characterized in that: The extrusion box (1) is provided with at least one set of extrusion components (3) for applying a stain-resistant treatment liquid and bidirectionally extruding the down, and the extrusion box (1) is also provided with an ultrasonic component (4) for driving the extrusion component (3) to vibrate. A plurality of feeding mechanisms (5) corresponding to the extrusion assemblies (3) are provided on the side of the extrusion box (1); an airflow pipe (6) for flattening the down, preliminarily drying the down, and conveying the down to the vacuum box (2) is provided on the outer sleeve of the extrusion box (1) located at the extrusion assembly (3); and a driving mechanism (7) for driving the extrusion assembly (3) to move is also provided on the other side of the extrusion box (1); The interior of the vacuum box (2) is provided with a plurality of vacuum cavities (201) corresponding one-to-one with the extrusion assemblies (3) for further drying the down.

2. The surface treatment device for stain-resistant down according to claim 1, characterized in that: The extrusion assembly (3) comprises two extrusion plates (301), one upper and one lower; A frame (302) connected to the driving mechanism (7) is provided on the sides of the two extrusion plates (301), and a first spring (303) is provided between the frame (302) and the extrusion plates (301).

3. The surface treatment device for stain-resistant down according to claim 2, characterized in that: The ultrasonic component (4) comprises an ultrasonic generator (401) fixed on the top of the extrusion box (1) and a vibration plate (402) connected to the vibration output end of the ultrasonic generator (401); The vibration plate (402) is inserted into the extrusion box (1) and abuts against the plurality of extrusion plates (301), and a third spring (403) is provided between the vibration plate (402) and the inner wall of the extrusion box (1).

4. The surface treatment device for stain-resistant down according to claim 2, characterized in that: An elastic liquid storage capsule (305) is provided inside the extrusion plate (301), a liquid inlet pipe (304) is provided on one side of the extrusion plate (301), and a plurality of liquid outlet holes (306) uniformly distributed in a lattice pattern are provided on the other side, and the liquid inlet pipe (304) and the liquid outlet holes (306) are both in communication with the elastic liquid storage capsule (305); The outlet of the liquid outlet hole (306) is provided with a wedge-shaped block (307) for blocking, the extrusion plate (301) is provided with a wedge-shaped groove that matches the wedge-shaped block (307), the wedge-shaped block (307) is fixedly provided with a second spring (309), and the other end of the second spring (309) is fixedly provided with an extrusion block (308) that abuts against the elastic liquid storage bag (305).

5. The surface treatment device for stain-resistant down according to claim 1, characterized in that: The feeding mechanism (5) comprises a metering cylinder (501) and an air cover (503) hingedly arranged on the top of the metering cylinder (501). A feeding pipe (502) inserted into the extrusion box (1) is provided at the bottom of the metering cylinder (501).

6. The surface treatment device for stain-resistant down according to claim 1, characterized in that: An outlet movable plate (101) is hingedly provided on one side of the extrusion box (1) close to the vacuum box (2), a closing plate (203) for opening and closing the vacuum chamber (201) is provided on the side of the outlet movable plate (101), and a cylinder (204) for driving the closing plate (203) to rise and fall is provided above the closing plate (203).

7. The surface treatment device for stain-resistant down according to claim 1, characterized in that: A scraping and discharging mechanism (8) is provided in the vacuum chamber (201), and the scraping and discharging mechanism (8) comprises a sliding block (801) slidably arranged in a sliding groove on the top surface of the vacuum chamber (201); A first magnet (802) and a second magnet (803) having opposite magnetic properties are respectively provided on both sides of the slider (801); a movable rod (805) is fixedly provided at the bottom of the first magnet (802); a scraper (806) is fixedly provided at the bottom end of the movable rod (805); a fixed block (804) for inserting the movable rod (805) is also fixedly provided below the first magnet (802); and a fourth spring (807) is sleeved on the movable rod (805) between the fixed block (804) and the first magnet (802).

8. The surface treatment device for stain-resistant down according to claim 7, characterized in that: The scraping and discharging mechanism (8) further comprises a sliding seat (808) slidably arranged in the finishing chamber (202) above the vacuum chamber (201); A third magnet (809) and a fourth magnet (810) having the same magnetic properties as the first magnet (802) are respectively provided at both ends of the bottom of the sliding seat (808), and a push-pull handle (811) is provided at the top of the sliding seat (808).

9. A surface treatment method for stain-resistant down, using the surface treatment device for stain-resistant down according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1, placing the down to be processed into the feeding mechanism (5), and then conveying it to the extrusion assembly (3) through the airflow, and then starting the four airflow pipes (6) around the extrusion box (1) to suspend and flatten the down under the action of the airflow; S2, applying the stain-resistant treatment liquid to the down through the extrusion component (3), and bidirectionally squeezing the down so that the stain-resistant treatment liquid is squeezed into the down fibers, during which the ultrasonic component (4) drives the extrusion component (3) to vibrate so that the stain-resistant treatment liquid can further penetrate into the down fibers. After the squeezing is completed, hot air is output through the airflow pipe (6) to preliminarily dry the down; S3, repeat step S2 multiple times; S4, restarting the airflow pipe (6) on the side opposite to the vacuum box (2), and transporting the preliminarily dried down to the vacuum box (2) through the airflow for further drying.

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