Brush head jig for toothbrush head production and method for manufacturing toothbrush head

Abstract

The present application relates to a brush head jig for the production of toothbrush heads and a method for manufacturing toothbrush heads, wherein the brush head jig includes a jig body, a bristle receiving portion, a sealing surface, and one or more positioning holes; the bristle receiving portion is provided on one side of the jig body, and the bristle receiving portion is used to accommodate the free ends of the implanted bristles during the manufacturing process of the toothbrush head; the sealing surface is located on the side of the jig body that is away from the bristle receiving portion, and the sealing surface is used to restrict the material of the coating layer from entering the bristle receiving portion when forming the coating layer; the positioning holes pass through the wall portion of the jig body between the sealing surface and the bristle receiving portion, and the positioning holes are used to provide a partial wall of the cavity when forming the retaining portion, as well as to position the retained portion obtained by the molding. The brush head jig of the present application includes parts corresponding to the brush head body, bristles, and the coating layer at the same time, and one brush head jig can be used to participate in the entire process of toothbrush head production, which simplifies the production process of the toothbrush head and ensures that the dimensions of the various components in the manufactured toothbrush head are precisely matched.

Description

Technical Field

[0001] The present application relates to the field of jig technology, and in particular to a brush head jig for producing toothbrush heads and a method for manufacturing toothbrush heads. Background Art

[0002] A toothbrush is a cleaning tool that people need to use every day, and is generally composed of a toothbrush head and a toothbrush handle. Among them, a toothbrush head generally includes a brush head body and bristles. In order to improve the user experience of the toothbrush, some toothbrush heads add a soft coating layer to the brush head body, or add components such as a tongue brush. In the process of conceiving and realizing this application, the inventor found that there are at least the following problems: in order to manufacture different components of the toothbrush head, a variety of corresponding jigs are needed, which makes the manufacturing process of the toothbrush head more cumbersome, and there may be size differences between different jigs and molds, and the different components of the toothbrush head manufactured in this way are prone to size errors. Summary of the Invention

[0003] In response to the above technical problems, the present application provides a brush head jig for the production of toothbrush heads and a method for manufacturing toothbrush heads. The structural design of the brush head jig can participate in the entire process of toothbrush head production, simplifying the production process of toothbrush heads, improving the production efficiency of toothbrush heads, and ensuring the precise matching of the sizes of the components in the manufactured toothbrush heads.

[0004] In order to solve the above technical problems, the present application provides a brush head jig for the production of toothbrush heads, wherein the toothbrush head comprises a brush head body, bristles and a covering layer, the brush head body comprises one or more retaining parts, one end of the bristles is fixed by the retaining part, the covering layer at least covers the part of the brush head body away from the free end of the bristles, the brush head jig comprises a jig body, a bristle accommodating part, a sealing surface and one or more positioning holes; wherein,

[0005] The bristle accommodating portion is provided on one side of the jig body, and the bristle accommodating portion is used to accommodate the free ends of the implanted bristles during the manufacturing process of the toothbrush head;

[0006] The sealing surface is located on a side of the jig body facing away from the bristle receiving portion, and the sealing surface is used to restrict the material of the coating layer from entering the bristle receiving portion when forming the coating layer;

[0007] The one or more positioning holes pass through the wall of the jig body between the side where the sealing surface is located and the side where the bristle receiving portion is located. The one or more positioning holes are used to provide partial walls of the cavity when molding the one or more retaining portions, and to position the one or more retaining portions obtained by molding.

[0008] Optionally, the positioning hole includes a first positioning hole and a second positioning hole, the first positioning hole is used to provide a partial wall of the mold cavity when forming the first retaining portion in the retaining portion, and the first retaining portion obtained by positioning molding is interconnected with the first positioning holes, the second positioning hole is located on the peripheral side of the first positioning hole, and is used to provide a partial wall of the mold cavity when forming the second retaining portion in the retaining portion, and the second positioning holes obtained by positioning molding are not interconnected.

[0009] Optionally, a first opening is provided at one end of the hole structure after the first positioning holes are connected to each other, and a second opening is provided on a side of the bristle accommodating portion corresponding to the first opening, and the first opening is connected to the second opening.

[0010] Optionally, a partial area of ​​the sealing surface is used to provide a partial wall of a cavity of a connector when molding the retaining portion, and the connector is used to connect the first retaining portion and the second retaining portion in the retaining portion.

[0011] Optionally, the end surface of one side of the jig body facing away from the bristle receiving portion is concave to form the sealing surface; or, the end surface of one side of the jig body facing away from the bristle receiving portion is convex to form the sealing surface; or, a portion of the plane of the jig body facing away from the bristle receiving portion is the sealing surface.

[0012] Optionally, the brush head fixture is made of metal or hard plastic.

[0013] On the other hand, the present application also provides a method for manufacturing a toothbrush head, comprising the following steps:

[0014] S201: Providing the brush head fixture as described above;

[0015] S202: Fixing the brush head fixture in a first mold so that the wall of the positioning hole of the brush head fixture cooperates with the first mold to form a first cavity, and injecting the brush head body into the first cavity, wherein the retaining portion on the brush head body corresponds to the positioning hole and is positioned in the positioning hole;

[0016] S203: removing the brush head jig and the brush head body from the first mold and fixing them in a bristle planting jig, passing the bristles through the holding portion and fixing them by the bristle planting jig, so that the free ends of the bristles are accommodated in the bristle receiving portion;

[0017] S204: The assembly of the brush head fixture and the brush head body after hair transplantation is removed from the hair transplantation fixture and fixed in a second mold, so that a second cavity is formed between the sealing surface and the second mold, and the coating layer is formed by injection molding in the second cavity.

[0018] Optionally, in step S202 , the wall portion of the positioning hole of the brush head fixture constitutes a portion of the outer side wall of the first cavity corresponding to the retaining portion.

[0019] Optionally, the step S203 includes:

[0020] Using the bristle planting jig, one end of the bristle is passed from one side of the sealing surface through the retaining portion positioned in the positioning hole and extended into the bristle receiving portion;

[0021] The end portion of the bristles located on the side of the sealing surface is processed so that the bristles are fixed by the holding portion.

[0022] Optionally, after step S204, the method further includes:

[0023] removing the assembly of the brush head jig and the brush head body forming the coating layer from the second mold;

[0024] The brush head body forming the coating layer is separated from the brush head jig.

[0025] Optionally, the material injected into the first cavity is a hard plastic precursor, and the material injected into the second cavity is a soft plastic precursor.

[0026] The brush head jig of the present application for the production of toothbrush heads comprises a brush head body, bristles and a covering layer, the brush head body comprises one or more retaining parts, one end of the bristles is fixed by the retaining part, and the covering layer at least covers the part of the brush head body away from the free end of the bristles, the brush head jig comprises a jig body, a bristle accommodating part, a sealing surface and one or more positioning holes; a bristle accommodating part is provided on one side of the jig body, and the bristle accommodating part is used to accommodate the free ends of the implanted bristles during the manufacturing process of the toothbrush head; the sealing surface is located on the side of the jig body facing away from the bristle accommodating part, and the sealing surface is used to limit the material of the covering layer from entering the bristle accommodating part when forming the covering layer; the positioning hole passes through the wall of the jig body between the side where the sealing surface is located and the side where the bristle accommodating part is located, and the positioning hole is used to provide a partial wall of the cavity when forming the retaining part, and to position the retaining part obtained by the molding. The brush head jig of the present application also includes parts corresponding to the brush head body, bristles, and covering layer. One brush head jig can be used to participate in the entire process of toothbrush head production, which simplifies the production process of toothbrush heads, improves the production efficiency of toothbrush heads, and ensures that the dimensions of each component in the manufactured toothbrush head are precisely matched.

[0027] The manufacturing method of the toothbrush head of the present application includes: providing a brush head jig; fixing the brush head jig in a first mold so that the wall of the positioning hole of the brush head jig cooperates with the first mold to form a first cavity, and forming the brush head body by injection molding in the first cavity, wherein the retaining portion on the brush head body corresponds to the positioning hole and is positioned in the positioning hole; removing the brush head jig and the brush head body from the first mold and fixing them in a hair planting jig, passing the bristles through the retaining portion and fixing them through the hair planting jig so that the free ends of the bristles are accommodated in the bristle receiving portion; removing the assembly of the brush head jig and the brush head body after hair planting from the hair planting jig and fixing them in a second mold so that a second cavity is formed between the sealing surface and the second mold, and forming a coating layer by injection molding in the second cavity. The brush head jig of the present application participates in the entire process of toothbrush head production, simplifies the production process of toothbrush heads, ensures that the dimensions of the components in the manufactured toothbrush heads are precisely matched, and improves the production efficiency of toothbrush heads. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic structural diagram of a toothbrush head according to the first embodiment of the present application;

[0029] Figure 2 1 is a schematic structural diagram of a brush head body according to the first embodiment of the present application;

[0030] Figure 3 This is one of the structural schematic diagrams of the toothbrush fixture according to the first embodiment of the present application;

[0031] Figure 4 This is a second structural diagram of the toothbrush fixture according to the first embodiment of the present application;

[0032] Figure 5 This is a schematic diagram of the combination of a brush head body and a toothbrush fixture according to the first embodiment of the present application;

[0033] Figure 6 1 is a schematic diagram of a combination of a toothbrush head with bristles and a brush head fixture according to the first embodiment of the present application;

[0034] Figure 7 1 is a schematic diagram of a combination of a toothbrush head with a wrapping layer and a brush head fixture according to the first embodiment of the present application;

[0035] Figure 8 is a schematic structural diagram of another sealing surface according to the first embodiment of the present application;

[0036] Figure 9 2 is a schematic structural diagram of a brush head body according to the second embodiment of the present application;

[0037] Figure 10 This is one of the structural schematic diagrams of a toothbrush fixture according to the second embodiment of the present application;

[0038] Figure 11 This is a second structural diagram of a toothbrush fixture according to the second embodiment of the present application;

[0039] Figure 12 2 is a schematic diagram of the combination of a brush head body and a toothbrush fixture according to the second embodiment of the present application;

[0040] Figure 13 It is a flow chart of a method for manufacturing a toothbrush head according to the third embodiment of the present application.

[0041] Description of reference numerals:

[0042] 10. Brush head body; 11. Bristles; 12. Covering layer; 13. Holding portion; 131. First holding portion; 132. Connector; 133. Second holding portion; 134. Fixing hole;

[0043] 30. The jig body; 31. The bristle receiving part; 32. The sealing surface; 33. The positioning hole; 331. The first positioning hole; 332. The second positioning hole. DETAILED DESCRIPTION

[0044] The following describes the implementation of the present application through specific embodiments. People familiar with this technology can easily understand other advantages and effects of the present application from the contents disclosed in this specification.

[0045] In the following description, reference is made to the accompanying drawings, which illustrate several embodiments of the present application. It should be understood that other embodiments may be used, and that mechanical, structural, electrical, and operational changes may be made without departing from the spirit and scope of the present application. The following detailed description should not be considered limiting, and the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the present application.

[0046] Although the terms "first", "second", etc. are used herein to describe various elements in some instances, these elements should not be limited by these terms. These terms are only used to distinguish one element from another.

[0047] Furthermore, as used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It should be further understood that the terms "comprise", "include" indicate the presence of the described features, steps, operations, elements, components, items, kinds, and / or groups, but do not exclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, components, items, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Thus, "A, B, or C" or "A, B, and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B, and C". Exceptions to this definition occur only when the combination of elements, functions, steps, or operations is inherently mutually exclusive in some way.

[0048] First embodiment

[0049] Figure 1 It is a schematic structural diagram of a toothbrush head according to the first embodiment of the present application. Figure 2 Schematic diagram of the structure of the brush head body according to the first embodiment of the present application. Figure 1 and Figure 2 As shown, the toothbrush head includes a brush head body 10, bristles 11 and a covering layer 12. The brush head body 10 includes one or more retaining parts 13, one end of the bristles 11 is fixed by the retaining part 13, and the covering layer 12 at least covers the part of the brush head body 10 away from the free end of the bristles 11.

[0050] like Figure 3 and Figure 4 As shown, the brush head jig for toothbrush head production according to the embodiment of the present application can be used to produce the toothbrush heads of the above structure. The brush head jig includes a jig body 30 , a bristle accommodating portion 31 , a sealing surface 32 and one or more positioning holes 33 .

[0051] A bristle receiving portion 31 is provided on one side of the jig body 30. The bristle receiving portion 31 is used to receive the free ends of the implanted bristles 11 during the manufacturing process of the toothbrush head. A sealing surface 32 is located on the side of the jig body 30 facing away from the bristle receiving portion 31. The sealing surface 32 is used to restrict the material of the coating layer 12 from entering the bristle receiving portion 31 when forming the coating layer 12. One or more positioning holes 33 pass through the wall of the jig body 30 between the side where the sealing surface 32 is located and the side where the bristle receiving portion 31 is located. The one or more positioning holes 33 are used to provide a partial wall of the cavity when forming the retaining portion 13, and to position the retaining portion 13 obtained by the molding.

[0052] In this embodiment, the brush head fixture is made of metal material or hard plastic, and has high hardness and strength. When placed in the mold cavity for forming the toothbrush head, it can withstand the large injection pressure in the mold cavity and maintain dimensional stability, and can be reused.

[0053] Combine Figure 2 、 Figure 3 and Figure 5 ,in, Figure 5 (a) is a schematic diagram of the combination of the brush head body and the brush head fixture on one side. Figure 5 (b) is a schematic diagram of the other side of the brush head body and the brush head jig. The positioning hole 33 in the brush head jig corresponds to the retaining portion 13. Specifically, the positioning hole 33 passes through the wall of the jig body 30 between the sealing surface 32 and the bristle receiving portion 31. The positioning hole 33 is used to provide a partial wall of the cavity when molding the retaining portion 13, and the injection molding material is injected into the cavity to mold the retaining portion 13. In addition, the positioning hole 33 is also used to position the molded retaining portion 13. After the brush head body 10 is molded for the first time, the positioning hole 33 fixes the molded retaining portion 13 in the positioning hole 33 to prevent the retaining portion 13 from moving during the manufacturing process, reduce assembly errors, and facilitate the smooth progress of subsequent manufacturing processes.

[0054] As one embodiment, the depth of the positioning hole 33 can be selected to be smaller than the height of the holding portion 13 so that the holding portion 13, the bristles 11 and the wrapping layer 12 in the toothbrush head are integrally formed.

[0055] In one embodiment, the retaining portion 13 includes a first retaining portion 131 and a second retaining portion 133. The first retaining portion 131 is located in the middle and lower part of the brush head body 10 and is connected as an integral unit. The second retaining portion 133 is located on the circumference of the brush head body 10 and is independent of each other. The second retaining portion 133 is connected to the integrally connected first retaining portion 131 via a connecting member 132. Accordingly, the positioning holes 33 include a first positioning hole 331 and a second positioning hole 332. The first positioning hole 331 corresponds to the first retaining portion 131 and is interconnected. The second positioning holes 332 are located on the circumference of the first positioning hole 331 and correspond to the second retaining portion 133. The second positioning holes 332 are not interconnected. In this way, the positioning hole 33 can provide partial walls of the cavity for molding the first retaining part 131 and the second retaining part 133 respectively during the molding process of the toothbrush head. The first retaining part 131 and the second retaining part 133 can be obtained by injection molding in the cavity formed by the positioning hole 33 and the mold for molding the brush head body.

[0056] As one of the embodiments, the second retaining portion 133 is connected to the first retaining portion 131 by a connector 132, and part of the wall of the sealing surface is also used to provide part of the wall of the cavity for the connector 132 when molding the retaining portion 13. The connector 132 is located between the first retaining portion 131 and the second retaining portion 133. Since the first retaining portion 131 and the second retaining portion 133 both correspond one-to-one to the positioning holes 33, the positioning holes 33 can provide part of the wall of the cavity for molding the first retaining portion 131 and the second retaining portion 133 respectively during the molding process of the toothbrush head. The positioning holes 33 pass through the sealing surface 32, and provide part of the wall of the cavity during the molding process of the connector 132 through the sealing surface 32. The connector 132 can be obtained synchronously by injection molding in the cavity formed by the sealing surface 32 and the mold for molding the brush head body.

[0057] In one embodiment, a first opening is provided at one end of the interconnected hole structure of the first positioning holes 331, and a second opening is provided on the side of the bristle receiving portion 31 corresponding to the first opening, with the first opening and the second opening communicating with each other. This design allows for the integrated molding of the brush head body and the brush handle, facilitating the manufacture of the brush head jig and facilitating smooth demolding of the completed toothbrush head from the brush head jig.

[0058] Combine Figure 2 、 Figure 3 and Figure 6 ,in, Figure 6 (a) is a schematic diagram of a toothbrush head with bristles and a brush head fixture on one side. Figure 6 (b) is a schematic diagram of the combination of a toothbrush head with bristles and the other side of a brush head jig. The bristle receiving portion 31 of the brush head jig is used for the hair transplanting process and the second molding of the wrapping layer 12. The free ends of the bristles 11 are accommodated in the bristle receiving portion 31 to prevent the hair transplanting jig or the second mold from crushing or scalding the bristles 11. Preferably, the shape of the bristle receiving portion 31 can be a cavity formed by the inward concave portion of one side of the brush head jig, and the bristles 11 are accommodated in the cavity. In other embodiments, one side of the jig body 30 can also be a plane, and the brush head jig is placed in a mold for the hair transplanting process (referred to as the hair transplanting jig), or in a mold for the second molding of the wrapping layer 12 (referred to as the second mold). The plane can serve as the bristle receiving portion and form a cavity for accommodating the bristles with the hair transplanting jig or the second mold.

[0059] Combine Figure 1 、 Figure 3 and Figure 7 ,in, Figure 7 (a) is a schematic diagram of the combination of a toothbrush head with a wrapping layer and a brush head fixture on one side. Figure 7(b) is a schematic diagram of the assembly of the toothbrush head with the wrapping layer and the other side of the brush head fixture. When the soft material coating layer 12 is injection molded, the soft material wraps around the sealing surface 32 of the brush head fixture, which plays a sealing role and prevents the soft material from entering the bristle receiving portion 31. Figure 1 As shown, the shape of the area where the sealing surface 32 is located matches the shape of the toothbrush head, and the end surface of the fixture body 30 facing away from the bristle receiving portion 31 is concave to form the sealing surface 32. In this way, it is convenient for the sealing surface 32 to cooperate with the second mold to form a cavity for forming the wrapping layer 12. In another embodiment, as Figure 8 As shown, the end surface of the jig body 30, facing away from the bristle receiving portion 31, is convex to form a sealing surface 32. This facilitates the engagement of the sealing surface 32 with a corresponding position in the second mold to form a cavity for molding the wrapping layer 12. Of course, in other embodiments, a portion of the jig body 30 facing away from the bristle receiving portion 31 may serve as the sealing surface 32. This facilitates the manufacture of toothbrush heads.

[0060] The brush head jig for producing toothbrush heads according to the embodiment of the present application comprises a brush head body, bristles and a covering layer, the brush head body comprising one or more retaining parts, one end of the bristles being fixed by the retaining part, and the covering layer at least covering the part of the brush head body away from the free end of the bristles, the brush head jig comprising a jig body, a bristle accommodating part, a sealing surface and one or more positioning holes; a bristle accommodating part is provided on one side of the jig body, the bristle accommodating part being used to accommodate the free ends of the implanted bristles during the manufacturing process of the toothbrush head; the sealing surface is located on the side of the jig body facing away from the bristle accommodating part, the sealing surface being used to limit the material of the covering layer from entering the bristle accommodating part when forming the covering layer; the positioning hole passes through the wall of the jig body between the sealing surface and the bristle accommodating part, the positioning hole being used to provide a partial wall of the cavity when forming the retaining part, and to position the retaining part obtained by the molding. In this way, the brush head jig includes parts corresponding to the brush head body, bristles, and covering layer. One brush head jig can be used to participate in the entire process of toothbrush head production, which simplifies the production process of toothbrush heads, improves the production efficiency of toothbrush heads, and ensures that the dimensions of each component in the manufactured toothbrush head are precisely matched.

[0061] Second embodiment

[0062] Figure 9 : is a structural diagram of the brush head body according to the second embodiment of the present application. Figure 9 As shown, unlike the brush head body of the first embodiment, the brush head body 10 of this embodiment includes a retaining portion 13 having a plurality of fixing holes 134. When manufactured as a toothbrush head, one end of the bristles is fixed through the fixing holes 134 in the retaining portion 13, and the coating layer covers at least the portion of the brush head body 10 away from the free ends of the bristles.

[0063] like Figure 10 and Figure 11 As shown, the brush head jig for toothbrush head production according to the embodiment of the present application can be used to produce toothbrush heads having a brush head body 10 with the above-mentioned structure. The brush head jig includes a jig body 30, a bristle accommodating portion 31, a sealing surface 32 and a positioning hole 33.

[0064] Among them, a bristle accommodating portion 31 is provided on one side of the jig body 30, and the bristle accommodating portion 31 is used to accommodate the free ends of the implanted bristles 11 during the process of manufacturing the toothbrush head. The sealing surface 32 is located on the side of the jig body 30 facing away from the bristle accommodating portion 31, and the sealing surface 32 is used to limit the material of the coating layer 12 from entering the bristle accommodating portion 31 when forming the coating layer 12. The positioning hole 33 passes through the wall portion of the jig body 30 between the side where the sealing surface 32 is located and the side where the bristle accommodating portion 31 is located. The positioning hole 33 is used to provide a partial wall of the cavity when forming the retaining portion 13, and to position the retaining portion 13 obtained by the molding. In this embodiment, the sealing surface 32 is the area surrounding the positioning hole 33 on the side of the jig body 30 facing away from the bristle accommodating portion 31.

[0065] In this embodiment, the brush head fixture is made of metal material or hard plastic, and has high hardness and strength. When placed in the mold cavity for forming the toothbrush head, it can withstand the large injection pressure in the mold cavity and maintain dimensional stability, and can be reused.

[0066] like Figure 12 As shown, Figure 12 (a) is a schematic diagram of the combination of the brush head body and the brush head fixture on one side. Figure 12 (b) is a schematic diagram of the other side of the brush head body and the brush head jig. The positioning hole 33 in the brush head jig corresponds to the retaining portion 13. Specifically, the positioning hole 33 passes through the wall of the jig body 30 between the side where the sealing surface 32 is located and the side where the bristle receiving portion 31 is located. The positioning hole 33 is used to provide a part of the wall of the cavity when forming the retaining portion 13, and the injection molding material is injected into the cavity to form the retaining portion 13. In addition, the positioning hole 33 is also used to position the retaining portion 13 obtained by the molding. After the positioning hole 33 is formed for the first time in the brush head body 10, part of the outer wall of the retaining portion 13 cooperates with the positioning hole 33 of the brush head jig to fix the molded retaining portion 13 in the positioning hole 33, thereby preventing the retaining portion 13 from moving during the manufacturing process and reducing assembly errors so that the subsequent manufacturing process can proceed smoothly. At the same time, the fixing hole 134 in the retaining portion 13 is also positioned.

[0067] The bristle accommodating portion 31 of the brush head jig is used for the hair transplanting process and the second molding of the wrapping layer. The free ends of the bristles are accommodated in the bristle accommodating portion 31 to prevent the hair transplanting jig or the second mold from crushing or scalding the bristles. Preferably, the shape of the bristle accommodating portion 31 can be a cavity formed by the concave side of the jig body 30, and the bristles are accommodated in the cavity. In other embodiments, one side of the jig body 30 can also be a plane, and the brush head jig is placed in a mold for the hair transplanting process (referred to as the hair transplanting jig), or in a mold for the second molding of the wrapping layer (referred to as the second mold). The plane can be used as a bristle accommodating portion to form a cavity for accommodating bristles with the hair transplanting jig or the second mold. In this part, the way the brush head jig cooperates with the brush head body and the hair transplanting jig is similar to that of the first embodiment and will not be repeated.

[0068] When the soft material coating layer is injection molded, the sealing surface 32 of the brush head fixture is wrapped with soft material until it reaches this surface, which plays a sealing role and prevents the soft material from entering the bristle accommodating portion 31. Figure 10 As shown, in this embodiment, the sealing surface 32 is the area surrounding the positioning hole 33 on the side of the jig body 30 facing away from the bristle receiving portion 31. This area can be flat, concave, or convex. It only needs to be easy for the sealing surface 32 to fit with the corresponding position in the second mold to form the cavity for forming the wrapping layer. In this part, the coordination between the brush head jig, the brush head body, and the second mold is similar to that of the first embodiment and will not be repeated here.

[0069] The brush head jig for producing toothbrush heads according to the embodiment of the present application comprises a brush head body, bristles and a covering layer, the brush head body comprising a retaining portion, one end of the bristles being fixed by the retaining portion, and the covering layer at least covering a portion of the brush head body away from the free end of the bristles, the brush head jig comprising a jig body, a bristle accommodating portion, a sealing surface and one or more positioning holes; a bristle accommodating portion is provided on one side of the jig body, the bristle accommodating portion being used to accommodate the free ends of the implanted bristles during the manufacturing process of the toothbrush head; the sealing surface is located on the side of the jig body facing away from the bristle accommodating portion, the sealing surface being used to limit the material of the covering layer from entering the bristle accommodating portion when forming the covering layer; the positioning hole passes through the wall portion of the jig body between the sealing surface and the bristle accommodating portion, the positioning hole being used to provide a partial wall of the cavity when forming the retaining portion, and to position the retaining portion obtained by the molding. In this way, the brush head jig includes parts corresponding to the brush head body, bristles, and covering layer. One brush head jig can be used to participate in the entire process of toothbrush head production, which simplifies the production process of toothbrush heads, improves the production efficiency of toothbrush heads, and ensures that the dimensions of each component in the manufactured toothbrush head are precisely matched.

[0070] Third embodiment

[0071] Figure 13 FIG. 1 is a flow chart of a method for manufacturing a toothbrush head according to the third embodiment of the present application. Figure 13 As shown, the manufacturing method of the toothbrush head of the embodiment of the present application includes the following steps:

[0072] Step S201: providing a brush head fixture.

[0073] The structure of the brush head fixture is as described in the first embodiment or the second embodiment, and will not be repeated here.

[0074] Step S202: Fix the brush head fixture in the first mold so that the wall of the positioning hole of the brush head fixture cooperates with the first mold to form a first cavity, and inject the brush head body into the first cavity. The retaining part on the brush head body corresponds to the positioning hole and is positioned in the positioning hole.

[0075] Among them, the wall of the positioning hole of the brush head fixture is matched with the first mold to form a first cavity, that is, the wall of the positioning hole is part of the first cavity. After the brush head body is injection molded in the first cavity, the retaining part is immediately positioned in the positioning hole with high positioning accuracy.

[0076] Take the brush head body and brush head fixture described in the first embodiment as an example. Figure 5 As shown, Figure 5 (a) is a schematic diagram of the combination of the brush head body and the brush head fixture on one side. Figure 5 (b) is a schematic diagram of the other side of the brush head assembly and the brush head fixture. After the brush head fixture is secured to the first mold, the wall of the positioning hole 33 cooperates with the first mold to form a first cavity, within which the brush head body 10 is injection molded. The resulting retaining portion 13 corresponds one-to-one with the positioning hole 33 and is secured therein.

[0077] Take the brush head body and brush head fixture described in the second embodiment as an example. Figure 12 As shown, Figure 12 (a) is a schematic diagram of the combination of the brush head body and the brush head fixture on one side. Figure 12 (b) is a schematic diagram of the other side of the brush head assembly and the brush head fixture. After the brush head fixture is secured to the first mold, the wall of the positioning hole 33 cooperates with the first mold to form a first cavity, within which the brush head body 10 is injection molded. The resulting retaining portion 13 aligns with the positioning hole 33 and is secured therein.

[0078] As one embodiment, in step S202, the wall portion of the positioning hole of the brush head fixture constitutes a portion of the outer wall of the first cavity corresponding to the retaining portion.

[0079] Specifically, the brush head jig is placed in a one-time molded brush head body mold (i.e., the first mold) for injection molding to obtain a combination of the brush head jig and the brush head body. The joint between the brush head body and the brush head jig is divided into a retaining portion and a positioning hole portion. The exterior of the retaining portion is fitted with the brush head jig to ensure that the position of the retaining portion remains unchanged during subsequent processes. Among them, the material injected into the first cavity is a hard plastic precursor, which is used to form a hard brush head body to ensure the cleaning power of the toothbrush head.

[0080] Step S203: remove the brush head jig and the brush head body from the first mold and fix them in the bristle planting jig, pass the bristles through the retaining portion and fix them through the bristle planting jig, so that the free ends of the bristles are accommodated in the bristle receiving portion.

[0081] Among them, when the brush head jig and the brush head body are removed from the first mold, you can choose to remove the assembly of the brush head jig and the brush head body as a whole, so that there is no need to perform secondary positioning of the brush head body through the brush head jig before hair planting, which simplifies the process and has high positioning accuracy.

[0082] Take the brush head body and brush head fixture described in the first embodiment as an example. Figure 6 As shown, Figure 6 (a) is a schematic diagram of a combination of a toothbrush head with bristles and a brush head fixture. Figure 6 (b) is a schematic diagram of the combination of a toothbrush head with bristles and the other side of a brush head fixture. The retaining portion 13 is used to fix the bristles 11 during the hair transplanting process. The retaining portion 13 and the brush head fixture form a bristle accommodating portion 31 on one side, which is used to keep the bristles 11 in a cavity after the bristles 11 are implanted during the hair transplanting process, thereby preventing the bristles 11 from shifting and being damaged in subsequent processes. The process of using the brush head fixture described in the second embodiment to transplant the bristles of the brush head body described in the second embodiment is similar to this and will not be repeated here.

[0083] As one implementation manner, step S203 includes:

[0084] Using a bristle planting jig, one end of the bristle is passed from one side of the sealing surface through the retaining portion positioned in the positioning hole and extended into the bristle receiving portion;

[0085] The end portion of the bristles located on the sealing surface side is processed so that the bristles are fixed by the retaining portion.

[0086] Here, the brush head jig and the brush head body are fixed in the hair transplanting jig. The bristles are grabbed with a hair picker and pushed into the retaining part. The tail of the bristles is fused or bonded together by heat or glue to form the fixed end of the bristles. The brush head jig fixes all the retaining parts on the brush head body, so that the bristles can be effectively and accurately positioned with the hair transplanting jig during the hair transplanting process. The hair picker can align the positioning holes and accurately implant the bristles into the retaining part.

[0087] Step S204: remove the brush head fixture and the brush head body after hair transplantation from the hair transplantation fixture and fix it in a second mold to form a second cavity between the sealing surface and the second mold, and form a coating layer in the second cavity by injection molding.

[0088] Take the brush head body and brush head fixture described in the first embodiment as an example. Figure 7 As shown, Figure 7 (a) is a schematic diagram of the combination of a toothbrush head with a wrapping layer and a brush head fixture on one side. Figure 7 (b) is a schematic diagram of the combination of the toothbrush head with the wrapping layer and the other side of the brush head fixture. After the retaining portion 13 is planted with hair, it forms a closed plane with the sealing surface 32 of the brush head fixture, which is used to provide a stop surface for the soft material during the secondary injection molding of the soft material, preventing the soft material from entering the bristle accommodating portion 31 and wrapping the bristles. Among them, the material injected into the second cavity is a soft plastic precursor, which is used to form a soft wrapping layer 12 to improve the comfort of the toothbrush head at the entrance. The injection molding of the wrapping layer of the brush head body described in the second embodiment using the brush head fixture described in the second embodiment is similar to this and will not be repeated here.

[0089] As one implementation method, step S204 further includes:

[0090] A third cavity is formed between the bristle accommodating portion and the second mold. The third cavity is used to accommodate the bristles. The third cavity and the second cavity are isolated from each other by a sealing surface.

[0091] The brush head fixture and the brush head body component with bristles are placed in a secondary overmolding mold, and soft plastic is injection molded to obtain a toothbrush head.

[0092] Here, the brush head jig is placed in the second mold, dividing the cavity of the second mold into two parts, namely the second cavity and the third cavity. Among them, the third cavity is formed by the bristle accommodating part and the second mold, and is used to accommodate the bristles. The second cavity is a soft material filling cavity, which is used to form a wrapping layer. In this way, the bristles are completely isolated from the location where the soft material is located, preventing the soft material from entering the bristles during injection molding and wrapping the bristles together, making the toothbrush head unusable. At the same time, it also makes the injection molded surface smoother and more beautiful. Since the injection pressure in the mold cavity is very high during mold injection, only a very small gap is needed for the soft material to enter and fill, resulting in product defects. Therefore, a brush head jig made of metal or high-hardness plastic is used. It can not only resist the injection pressure in the mold cavity during injection molding, but also achieve a high degree of seamless fit with the metal material of the mold, achieving the effect of completely blocking the soft plastic.

[0093] As one implementation manner, after step S204, the method further includes:

[0094] removing the assembly of the brush head jig and the brush head body forming the coating layer from the second mold;

[0095] The brush head body with the coating layer formed thereon is separated from the brush head fixture.

[0096] The toothbrush head product is obtained by separating the brush head fixture from the toothbrush head product.

[0097] Here, the toothbrush head is manufactured by sequentially molding the brush head body, bristles, and wrapping layer of the toothbrush head using a brush head jig. The brush head jig is then demoulded and separated from the toothbrush head to obtain a finished toothbrush head.

[0098] The manufacturing method of the toothbrush head of the embodiment of the present application includes: providing a brush head jig; fixing the brush head jig in a first mold so that the wall of the positioning hole of the brush head jig cooperates with the first mold to form a first cavity, and injecting the brush head body into the first cavity, wherein the retaining portion on the brush head body corresponds to the positioning hole and is positioned in the positioning hole; removing the brush head jig and the brush head body from the first mold and fixing them in a hair planting jig, passing the bristles through the retaining portion and fixing them through the hair planting jig so that the free ends of the bristles are accommodated in the bristle receiving portion; removing the assembly of the brush head jig and the brush head body after hair planting from the hair planting jig and fixing them in a second mold so that a second cavity is formed between the sealing surface and the second mold, and injecting the coating layer into the second cavity. In this way, the brush head jig is used to participate in the entire process of toothbrush head production, simplifying the production process of the toothbrush head, ensuring that the dimensions of the various components in the manufactured toothbrush head are precisely matched, and improving the production efficiency of the toothbrush head.

[0099] All the above embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solution of the present application rather than to limit it. The scope of protection of the present application is not limited thereto. Any equivalent modification or replacement of the technical solution described in the above embodiments by any technician familiar with the technical field is included in the scope defined by the claims of the present application.

Claims

1. A method for manufacturing a toothbrush head, wherein the toothbrush head comprises a brush head body, bristles, and a covering layer, wherein the brush head body comprises one or more retaining portions, one end of the bristles being fixed by the retaining portions, and the covering layer at least covers a portion of the brush head body away from the free ends of the bristles, wherein: The following steps are involved: S201: Providing a brush head jig; the brush head jig comprises a jig body, a bristle receiving portion, a sealing surface, and one or more positioning holes; the bristle receiving portion is disposed on one side of the jig body, the sealing surface is located on a side of the jig body facing away from the bristle receiving portion, and the one or more positioning holes penetrate a wall portion of the jig body located between a side where the sealing surface is located and a side where the bristle receiving portion is located; S202: Fixing the brush head fixture in a first mold so that the wall of the positioning hole of the brush head fixture cooperates with the first mold to form a first cavity, and injection molding the brush head body in the first cavity, with the retaining portion on the brush head body corresponding to the positioning hole one by one and being positioned in the positioning hole; S203: removing the brush head jig and the brush head body from the first mold and fixing them in a bristle planting jig, passing the bristles through the holding portion and fixing them through the bristle planting jig, so that the free ends of the bristles are accommodated in the bristle receiving portion of the brush head jig; S204: The assembly of the brush head jig and the brush head body after hair transplantation is removed from the hair transplantation jig and fixed in a second mold, so that a second cavity is formed between the sealing surface of the brush head jig and the second mold, and a coating layer is formed in the second cavity by injection molding.

2. The manufacturing method according to claim 1, characterized in that In the step S202 , the wall portion of the positioning hole of the brush head fixture constitutes a portion of the first cavity corresponding to the outer side wall of the holding portion.

3. The manufacturing method according to claim 1, characterized in that The step S203 includes: Using the bristle planting jig, one end of the bristle is passed from one side of the sealing surface through the retaining portion positioned in the positioning hole and extended into the bristle receiving portion; The end portion of the bristles located on the side of the sealing surface is processed so that the bristles are fixed by the holding portion.

4. The manufacturing method according to claim 1, characterized in that After the step S204, the method further includes: removing the assembly of the brush head jig and the brush head body forming the coating layer from the second mold; The brush head body forming the coating layer is separated from the brush head jig.

5. The manufacturing method according to claim 1, characterized in that The material injected into the first cavity is a hard plastic precursor, and the material injected into the second cavity is a soft plastic precursor.

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