Pre-potting protective cap, pre-potting protective cap film covering device and film covering method

Abstract

The invention discloses a pre-potting protective cap, a pre-potting protective cap film covering device and a film covering method.The pre-potting protective cap comprises a protective cap body and a covering film, the covering film wraps the outer side of a protrusion, used for sealing an opening of a pre-potting container, on the protective cap body, and the covering film is used for preventing liquid medicine in the pre-potting container from making contact with the protective cap; and the covering film does not react with the liquid medicine in the pre-filling container. A clamping groove is formed in the upper end of a protruding forming groove of the first pre-encapsulation protective cap film covering device, and the clamping groove is used for containing a covering film and enabling the covering film to be horizontally kept in the clamping groove. The shape of the lower end of a suction nozzle of a suction head of the second pre-encapsulation protective cap film covering device is matched with the shape of the lower end of the protrusion forming groove, the suction nozzle is used for adsorbing the covering film and placing the covering film in the protrusion forming groove, and the upper side wall and the lower side wall of the covering film can make contact with the outer wall of the lower end of the suction nozzle and the inner side wall of the lower end of the protrusion forming groove correspondingly. The film covering method is a method based on the pre-encapsulation protective cap film covering device. The liquid medicine can be prevented from being polluted.

Description

Technical Field

[0001] The present invention relates to the technical field of pre-filling, and in particular to a pre-filling protective cap, a pre-filling protective cap laminating device and a laminating method. Background Art

[0002] Prefilled packaging is a method of pharmaceutical packaging whereby the drug is pre-filled into a small container during the production process, sealed with a resin cap, and then placed into a larger package. Prefilled packaging is a simple yet effective packaging method. Currently, caps are mostly made of rubber, which can easily react with the liquid drug in the prefilled container, leading to contamination. Summary of the Invention

[0003] The object of the present invention is to provide a pre-filled protective cap, a pre-filled protective cap coating device and a coating method to solve the problems existing in the above-mentioned prior art and prevent the pre-filled liquid from being contaminated.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides a prefilled protective cap, comprising a protective cap body and a covering film. The outer side of a protrusion on the protective cap body for sealing the opening of a prefilled container is wrapped with the covering film. The covering film is used to prevent the liquid medicine in the prefilled container from contacting the protective cap, and the covering film does not react with the liquid medicine in the prefilled container.

[0006] Preferably, the coating is a fluorine-containing polymer film, a polyester resin film or a polypropylene film.

[0007] The present invention provides a pre-filled protective cap coating device, comprising a lower mold and an upper mold, wherein the lower mold is provided with a protective cap molding groove for molding a protective cap body; the protective cap molding groove has a convex molding groove for molding a protrusion of the protective cap body, and the protrusion is used to seal the opening of the pre-filled container; the upper end of the convex molding groove has a clamping groove, and the clamping groove is used to accommodate the coating and keep the coating horizontally in the clamping groove.

[0008] Preferably, the inner side wall of the raised forming groove includes a first inner side wall and a second inner side wall, the first inner side wall is cylindrical, the second inner side wall is conical with a smaller bottom and a larger top, the lower edge of the first inner side wall is connected to the upper edge of the second inner side wall, the first inner side wall matches the outer side wall of the coating, and the first inner side wall surrounds the card groove.

[0009] Preferably, it also includes a suction head, the lower mold includes a lower mold body and a molding column, one end of the lower mold body is provided with a groove matching the shape of the outer wall of the protective cap body, one end of the molding column is fixedly connected to the inner bottom wall of the groove, the other end of the molding column extends toward the opening side of the groove, the other end of the molding column is provided with the convex molding groove, and the protective cap molding groove is formed between the outer wall of the molding column and the inner wall of the groove; a positioning groove is provided on the outer periphery of the suction nozzle of the suction head; the outer wall of the positioning groove can contact the outer wall of the upper end of the molding column and limit the movement of the suction head in a direction perpendicular to the center line of the protective cap molding groove; part of the outer wall of the suction head can contact the inner wall of the upper end of the protective cap molding groove and limit the movement of the suction head in a direction perpendicular to the center line of the protective cap molding groove.

[0010] The present invention provides a laminating method based on the pre-filled protective cap laminating device, comprising the following steps:

[0011] S1, placing the covering film in the card slot;

[0012] S2. Place the rubber material above the protective cap forming groove, close the upper mold and the lower mold, allow the rubber material to enter the protective cap forming groove and squeeze the coating, so that the coating is wrapped around the outside of the protrusion.

[0013] The present invention provides a pre-filled protective cap coating device, comprising an upper mold, a lower mold and a suction head, wherein the lower mold is provided with a protective cap molding groove for molding a protective cap body, the protective cap molding groove has a convex molding groove for molding a protrusion of the protective cap body, and the protrusion is used to seal the opening of the pre-filled container; the shape of the lower end of the suction nozzle of the suction head matches the shape of the lower end of the convex molding groove; the suction nozzle is used to absorb the coating and place the coating in the convex molding groove, and can make the upper side wall and the lower side wall of the coating respectively contact the outer wall of the lower end of the suction nozzle and the inner side wall of the lower end of the convex molding groove.

[0014] Preferably, the opening end of the protrusion forming groove is provided with a limiting protrusion protruding from the inner side wall of the protrusion forming groove, and the suction nozzle can place the coating in the protrusion forming groove and be located below the limiting protrusion, and the limiting protrusion can limit the movement of the coating in the protrusion forming groove toward the opening of the protrusion forming groove.

[0015] Preferably, the shape of the lower end of the suction nozzle matches the shape of the portion of the protrusion forming groove located below the limiting protrusion.

[0016] The present invention provides a laminating method based on the pre-filled protective cap laminating device, comprising the following steps:

[0017] S1. Use the nozzle of the suction head to suck the coating, insert the suction head into the protective cap forming groove, allow the coating to enter the protrusion forming groove, and adhere to the lower end of the inner side wall of the protrusion forming groove; remove the suction head from the protective cap forming groove;

[0018] S2. Place the rubber material above the protective cap forming groove, close the upper mold and the lower mold, allow the rubber material to enter the protective cap forming groove and squeeze the coating, so that the coating is wrapped around the outside of the protrusion.

[0019] Compared with the prior art, the present invention has achieved the following technical effects:

[0020] The present invention provides a prefilled protective cap, a prefilled protective cap coating device, and a coating method. The cap comprises a protective cap body and a coating. The outer side of a protrusion on the cap body, which is used to seal the opening of the prefilled container, is coated with a coating. The coating is used to prevent the liquid medicine in the prefilled container from contacting the cap. The coating does not react with the liquid medicine in the prefilled container. The non-reactive coating isolates the cap from the liquid medicine, preventing the liquid medicine from reacting with the cap and thereby preventing contamination of the liquid medicine. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 A schematic structural diagram of the pre-filled protective cap provided in Example 1;

[0023] Figure 2 A cross-sectional view of the pre-filled protective cap provided in Example 1;

[0024] Figure 3 A half-section schematic diagram of the pre-filled protective cap provided in Example 1;

[0025] Figure 4 Schematic diagram of the installation of the pre-filled protective cap provided in Example 1 Figure 1 ;

[0026] Figure 5 Schematic diagram of the installation of the pre-filled protective cap provided in Example 1 Figure 2 ;

[0027] Figure 6 This is a schematic diagram of the pre-filled protective cap laminating device when the mold is closed;

[0028] Figure 7This is a schematic diagram of the pre-filled protective cap laminating device when the mold is opened and the rubber material is placed;

[0029] Figure 8 Schematic diagram of the structure of the lower mold in Example 2;

[0030] Figure 9 The process of the coating method in Example 3 Figure 1 ;

[0031] Figure 10 The process of the coating method in Example 3 Figure 2 ;

[0032] Figure 11 Schematic diagram of the structure of the suction head in Example 4;

[0033] Figure 12 Schematic diagram of the structure of the lower mold in Example 4;

[0034] Figure 13 The process of the coating method in Example 5 Figure 1 ;

[0035] In the figure: 100, pre-filled protective cap; 200, pre-filled protective cap laminating device 1; 300, pre-filled protective cap laminating device 2; 1, protective cap body; 101, protrusion; 2, laminating; 3, lower mold; 301, protective cap forming groove; 302, protrusion forming groove 1; 303, clamping groove; 304, first inner side wall; 305, second inner side wall; 306, lower mold body; 307, forming column; 308, protrusion forming groove 2; 309, limiting protrusion; 4, upper mold; 5, suction head; 501, suction nozzle 1; 502, positioning groove; 503, suction nozzle 2; 6, adhesive. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] It should be noted that in the description of the present invention, terms such as "upper", "lower", "left", "right", "inside", "outside", "front", "back", "center", "longitudinal", "lateral", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "clockwise", and "counterclockwise" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it should not be understood as limiting the present invention. In addition, the terms "first", "second", "third", and "fourth" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0038] Furthermore, it should be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "disposed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0039] The object of the present invention is to provide a pre-filled protective cap, a pre-filled protective cap coating device and a coating method to solve the problems existing in the above-mentioned prior art and prevent the pre-filled liquid from being contaminated.

[0040] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] Example 1

[0042] like Figures 1 to 5 As shown, this embodiment provides a prefilled container protective cap 100, comprising a protective cap body 1 and a film 2. The film 2 is wrapped around the outer side of a protrusion 101 on the protective cap body 1, which is used to seal the opening of the prefilled container. The film 2 is used to prevent the liquid medicine in the prefilled container from coming into contact with the protective cap, and the film 2 does not react with the liquid medicine in the prefilled container. The film 2, which does not react with the liquid medicine, isolates the protective cap from the liquid medicine, preventing the liquid medicine from reacting with the protective cap and, in turn, preventing the liquid medicine from being contaminated.

[0043] In some specific embodiments, the coating 2 may be, but is not limited to, a fluorine-containing polymer film (such as a fluorine-based film material mainly composed of tetrafluoroethylene), a polyester resin film, or a polypropylene film.

[0044] In some specific embodiments, an end of the protective cap body 1 close to the protrusion 101 is provided with an external thread for threaded connection with the prefilled container to achieve fixation.

[0045] Example 2

[0046] like Figures 6-10 As shown, this embodiment provides a pre-filled protective cap coating device 200, including a lower mold 3 and an upper mold 4, the lower mold 3 is provided with a protective cap molding groove 301 for molding the protective cap body 1; the protective cap molding groove 301 has a protrusion molding groove 302 for molding the protrusion 101 of the protective cap body 1, and the protrusion 101 is used to seal the opening of the pre-filled container; the upper end of the protrusion molding groove 302 has a card slot 303, and the card slot 303 is used to accommodate the coating 2 and keep the coating 2 horizontally in the card slot 303. First, place the film 2 in the slot 303, then place the rubber material 6 above the protective cap molding groove 301, and close the upper mold 4 and the lower mold 3 to allow the rubber material 6 to enter the protective cap molding groove 301 and squeeze the film 2, so that the film 2 contacts the lower end of the inner bottom wall of the protrusion molding groove 302, and the rubber material 6 completely fills the protective cap molding groove 301, so that the film 2 covers the lower end of the protrusion 101 of the protective cap body 1.

[0047] In some specific embodiments, the inner sidewall of the raised molding groove 1 302 includes a first inner sidewall 304 and a second inner sidewall 305. The first inner sidewall 304 is cylindrical, and the second inner sidewall 305 is tapered, with a smaller bottom and a larger top. The lower edge of the first inner sidewall 304 is connected to the upper edge of the second inner sidewall 305. The first inner sidewall 304 matches the outer sidewall of the film 2, and the first inner sidewall 304 surrounds a retaining groove 303. After the film 2 is placed in the retaining groove 303, the outer sidewall of the film 2 can be in full or almost full contact with the first inner sidewall 304, ensuring the stability of the placement of the film 2 and reducing the displacement of the film 2 during subsequent molding. The inner diameter of the second inner sidewall 305 gradually decreases from top to bottom, so that the lower end of the retaining groove 303 (the upper end of the second inner sidewall 305) can limit the film 2 and restrict its downward movement.

[0048] In some specific embodiments, a suction head 5 is also included, and the lower mold 3 includes a lower mold body 306 and a molding column 307. One end of the lower mold body 306 is provided with a groove matching the shape of the outer wall of the protective cap body 1, and one end of the molding column 307 is fixedly connected to the inner bottom wall of the groove, and the other end of the molding column 307 extends toward the opening side of the groove. The other end of the molding column 307 is provided with a raised molding groove 302, and a protective cap molding groove 301 is formed between the outer wall of the molding column 307 and the inner wall of the groove; the outer periphery of the suction nozzle 501 of the suction head 5 is provided with a positioning groove 502; the outer wall of the positioning groove 502 can contact the outer wall of the upper end of the molding column 307 and limit the movement of the suction head 5 in a direction perpendicular to the center line of the protective cap molding groove 301; part of the outer wall of the suction head 5 can contact the inner wall of the upper end of the protective cap molding groove 301 and limit the movement of the suction head 5 in a direction perpendicular to the center line of the protective cap molding groove 301. The first limit is formed by the cooperation between the suction head 5 and the inner side wall of the upper end of the protective cap molding groove 301, and the second limit is formed by the cooperation between the side wall of the outer ring of the positioning groove 502 and the outer side wall of the upper end of the molding column 307, thereby improving the positioning accuracy of the suction head 5 and ensuring that the film 2 can be placed more accurately in the card slot 303, thereby reducing the deviation of the film 2 during the molding process and improving the molding quality.

[0049] Example 3

[0050] like Figures 6-10 As shown, this embodiment provides a laminating method 2 of the pre-filled protective cap laminating device 200 based on the embodiment 2, comprising the following steps:

[0051] S1, placing the film 2 in the card slot 303;

[0052] S2. Place the rubber material 6 above the protective cap molding groove 301, close the upper mold 4 and the lower mold 3, allow the rubber material 6 to enter the protective cap molding groove 301 and squeeze the coating 2, so that the coating 2 contacts the lower end of the inner bottom wall of the protrusion molding groove 302, so that the rubber material 6 completely fills the protective cap molding groove 301, and the coating 2 is wrapped around the outside of the protrusion 101.

[0053] It should be noted that in S2 , when the molds are closed, the rubber material 6 enters the protective cap molding groove 301 under the action of the pressure and temperature of the lower mold 3 .

[0054] Example 4

[0055] like Figures 11-13As shown, this embodiment provides a pre-filled protective cap coating device 2 300, including an upper mold 4, a lower mold 3 and a suction head 5, the lower mold 3 is provided with a protective cap molding groove 301 for molding the protective cap body 1, the protective cap molding groove 301 has a protrusion molding groove 2 308 for molding the protrusion 101 of the protective cap body 1, and the protrusion 101 is used to seal the opening of the pre-filled container; the shape of the lower end of the suction nozzle 2 503 of the suction head 5 matches the shape of the lower end of the protrusion molding groove 2 308; the suction nozzle 2 503 is used to absorb the coating 2 and place the coating 2 in the protrusion molding groove 2 308, and can make the upper side wall and the lower side wall of the coating 2 contact with the outer wall of the lower end of the suction nozzle 2 503 and the inner side wall of the lower end of the protrusion molding groove 2 308 respectively. By improving the shape of the suction head 5, when the suction nozzle 503 carries the coating 2 and enters the bottom of the raised molding groove 308, the coating 2 can be deformed from the initial sheet shape to a shape matching the outer wall of the suction nozzle 503 under the action of the suction nozzle 503 and the raised molding groove 308. Then the suction head 5 is taken out, and the coating 2 with a shape matching the outer wall of the suction nozzle 503 remains in the raised molding groove 308; then the mold is closed, and the rubber material 6 enters the protective cap molding groove 301 for molding, so that the coating 2 can be covered on the outside of the protrusion 101 of the protective cap with no offset or a small offset.

[0056] In some embodiments, the open end of the second protrusion-forming groove 308 is provided with a stopper protrusion 309 that protrudes from the inner sidewall of the second protrusion-forming groove 308. The second suction nozzle 503 can place the film 2 within the second protrusion-forming groove 308 and below the stopper protrusion 309. The stopper protrusion 309 can restrict the film 2 within the second protrusion-forming groove 308 from moving toward the opening of the second protrusion-forming groove 308. When removing the suction tip 5, the stopper protrusion 309 can limit the film 2, preventing it from moving upward with the second suction nozzle 503.

[0057] In some specific embodiments, the shape of the lower end of the second suction nozzle 503 matches the shape of the portion of the second protrusion forming groove 308 located below the limiting protrusion 309 .

[0058] In some specific embodiments, the limiting protrusion 309 is annular.

[0059] In some specific embodiments, the size requirements of the film 2 are: larger than the size of the opening at the upper end of the raised forming groove 308; in the process of entering the raised forming groove 308, the film 2 can be at least partially attached to the outer wall of the lower end of the suction nozzle 503 under the action of the limiting protrusion 309; when the film 2 is placed in the raised forming groove 308, the film 2 can completely wrap the lower end of the suction nozzle 503, and the upper end of the film 2 contacts the lower edge of the limiting protrusion 309, so as to reduce the displacement of the film 2 caused by the upward removal of the suction head 5.

[0060] In some specific embodiments, the lower mold 3 includes a lower mold body 306 and a molding column 307, one end of the lower mold body 306 is provided with a groove matching the shape of the outer wall of the protective cap body 1, one end of the molding column 307 is fixedly connected to the inner bottom wall of the groove, the other end of the molding column 307 extends toward the opening side of the groove, and the other end of the molding column 307 is provided with a raised molding groove 2 308, and a protective cap molding groove 301 is formed between the outer wall of the molding column 307 and the inner wall of the groove; a positioning groove 502 is provided on the outer periphery of the suction nozzle 2 503 of the suction head 5; the outer wall of the positioning groove 502 can contact the outer wall of the upper end of the molding column 307 and limit the movement of the suction head 5 in a direction perpendicular to the center line of the protective cap molding groove 301; part of the outer wall of the suction head 5 can contact the inner wall of the upper end of the protective cap molding groove 301 and limit the movement of the suction head 5 in a direction perpendicular to the center line of the protective cap molding groove 301. The double limit is used to improve the positioning accuracy of the suction head 5 and reduce the deviation caused by the placement of the film 2.

[0061] Example 5

[0062] like Figures 11-13 As shown, this embodiment provides a laminating method 2 of the pre-filled protective cap laminating device 2 300 based on the fourth embodiment, comprising the following steps:

[0063] S1. Use the second nozzle 503 of the suction head 5 to suck the film 2, insert the suction head 5 into the protective cap molding groove 301, and allow the film 2 to enter the second protrusion molding groove 308 and adhere to the lower end of the inner side wall of the second protrusion molding groove 308. Then, release the vacuum of the suction head 5, stop sucking the film 2, and remove the suction head 5 from the protective cap molding groove 301.

[0064] S2, placing the rubber material 6 above the protective cap forming groove 301, closing the upper mold 4 and the lower mold 3, allowing the rubber material 6 to enter the protective cap forming groove 301 and squeeze the film 2, so that the film 2 is wrapped around the outside of the protrusion 101.

[0065] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A pre-filled protective cap, characterized by: It includes a protective cap body and a covering film. The outer side of the protrusion on the protective cap body for sealing the opening of the prefilled container is wrapped with the covering film. The covering film is used to prevent the liquid medicine in the prefilled container from contacting the protective cap, and the covering film does not react with the liquid medicine in the prefilled container.

2. The pre-filled protective cap according to claim 1, characterized in that: The coating film is a fluorine-containing polymer film, a polyester resin film or a polypropylene film.

3. A pre-filled protective cap laminating device, characterized in that: It includes a lower mold and an upper mold, wherein the lower mold is provided with a protective cap molding groove for molding the protective cap body; the protective cap molding groove has a convex molding groove for molding the protrusion of the protective cap body, and the protrusion is used to seal the opening of the prefilled container; the upper end of the convex molding groove has a card slot, and the card slot is used to accommodate the coating and keep the coating horizontal in the card slot.

4. The pre-filled protective cap coating device according to claim 3, characterized in that: The inner side wall of the raised forming groove includes a first inner side wall and a second inner side wall, the first inner side wall is cylindrical, the second inner side wall is conical with a smaller bottom and a larger top, the lower edge of the first inner side wall is connected to the upper edge of the second inner side wall, the first inner side wall matches the outer side wall of the coating, and the first inner side wall surrounds the card groove.

5. The pre-filled protective cap coating device according to claim 3, characterized in that: It also includes a suction head, the lower mold includes a lower mold body and a forming column, one end of the lower mold body is provided with a groove matching the shape of the outer wall of the protective cap body, one end of the forming column is fixedly connected to the inner bottom wall of the groove, the other end of the forming column extends toward the opening side of the groove, the other end of the forming column is provided with the convex forming groove, and the protective cap forming groove is formed between the outer wall of the forming column and the inner wall of the groove; a positioning groove is provided on the outer periphery of the suction nozzle of the suction head; the outer wall of the positioning groove can contact the outer wall of the upper end of the forming column and limit the movement of the suction head in a direction perpendicular to the center line of the protective cap forming groove; part of the outer wall of the suction head can contact the inner wall of the upper end of the protective cap forming groove and limit the movement of the suction head in a direction perpendicular to the center line of the protective cap forming groove.

6. A laminating method for the pre-filled protective cap laminating device according to claim 3, characterized in that: The steps include: S1, placing the covering film in the card slot; S2. Place the rubber material above the protective cap forming groove, close the upper mold and the lower mold, allow the rubber material to enter the protective cap forming groove and squeeze the coating, so that the coating is wrapped around the outside of the protrusion.

7. A pre-filled protective cap laminating device, characterized in that: It includes an upper mold, a lower mold and a suction head, the lower mold is provided with a protective cap molding groove for molding a protective cap body, the protective cap molding groove has a convex molding groove for molding a protrusion of the protective cap body, and the protrusion is used to seal the opening of the prefilled container; the shape of the lower end of the suction nozzle of the suction head matches the shape of the lower end of the convex molding groove; the suction nozzle is used to absorb the film and place the film in the convex molding groove, and can make the upper side wall and the lower side wall of the film contact with the outer wall of the lower end of the suction nozzle and the inner side wall of the lower end of the convex molding groove respectively.

8. The pre-filled protective cap coating device according to claim 7, characterized in that: The opening end of the protrusion forming groove is provided with a limiting protrusion protruding from the inner side wall of the protrusion forming groove. The suction nozzle can place the coating in the protrusion forming groove and be located below the limiting protrusion. The limiting protrusion can limit the movement of the coating in the protrusion forming groove toward the opening of the protrusion forming groove.

9. The pre-filled protective cap coating device according to claim 8, characterized in that: The shape of the lower end of the suction nozzle matches the shape of the portion of the protrusion forming groove located below the limiting protrusion.

10. A laminating method for the pre-filled protective cap laminating device according to claim 7, characterized in that: The steps include: S1. Use the nozzle of the suction head to suck the coating, insert the suction head into the protective cap forming groove, allow the coating to enter the protrusion forming groove, and adhere to the lower end of the inner side wall of the protrusion forming groove; remove the suction head from the protective cap forming groove; S2. Place the rubber material above the protective cap forming groove, close the upper mold and the lower mold, allow the rubber material to enter the protective cap forming groove and squeeze the coating, so that the coating is wrapped around the outside of the protrusion.

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