Glue-free integrally-formed cosmetic brush and manufacturing method thereof

Abstract

The invention discloses a glue-free integrally-formed cosmetic brush. The glue-free integrally-formed cosmetic brush comprises a brush rod and a brush head assembly, the brush head assembly and the brush rod are integrally connected through injection molding. The brush head assembly comprises a bristle cluster, a sleeve and a plunger; the root of each bristle cluster is provided with at least two peripheral protrusions which are arranged at intervals in the circumferential direction, and a first groove is formed between the at least two peripheral protrusions; one end of the sleeve is connected with the brush rod; the inner wall of the other end of the sleeve is provided with an annular boss, the end face, facing the brush rod, of the annular boss is provided with at least two bearing bosses arranged at intervals in the circumferential direction, a second groove is formed between the at least two bearing bosses, the peripheral protrusion is meshed with the second groove, and the bearing bosses are meshed with the first groove; the plunger is embedded into the sleeve and is in zero-clearance fit with the sleeve, and the peripheral protrusion is clamped between the plunger and the annular boss. The device is few in parts, simple to manufacture, few in steps, firm to assemble and more environment-friendly, and glue bonding is omitted.

Description

Technical Field

[0001] The present invention relates to the technical field of makeup devices, and particularly relates to a glue-free one-piece makeup brush and a manufacturing method thereof. Background Art

[0002] With the increasing environmental protection requirements, the existing makeup brushes generally adopt a glue-free process. A skirt is formed at the root of the brush hair cluster and is embedded into the brush handle, such as the prior art with the patent publication number CN113271810A Figure 7 As shown, in this assembly method, the brush hair cluster is prone to break away from the brush handle, affecting the service life. In order to increase the connection reliability between the brush hair cluster and the brush handle, in the prior art, the brush hair cluster is connected to the brush handle by setting a connecting piece. For example, in the prior art with the patent publication number CN219069671U, when assembling the glue-free makeup brush, the skirt of the brush hair assembly is clamped between multiple elastic pieces of the sleeve. During this process, the elastic pieces move away from each other to expand the installation card slot. After the skirt enters the installation card slot, the elastic pieces recover their elastic deformation to narrow the installation card slot. Then, the sleeve is fixed on the rod piece by using a connection structure and the elastic pieces are driven to move closer to each other to hold the brush hair assembly. For example, in the prior art with the patent publication number CN116649710A, the brush head includes brush hairs and a mounting piece, and the combined buckle includes a first buckle piece and a second buckle piece; the first buckle piece and the second buckle piece are enclosed together, and a first groove is provided at the upper ends of the first buckle piece and the second buckle piece. The two first grooves enclose an installation groove, and the mounting piece is clamped in the installation groove. Without using glue, the brush head can be installed on the combined buckle. However, this kind of existing makeup brush has many parts, is complex and expensive to manufacture because their manufacturing requires many steps, and the assembly is not firm enough and other defects. Summary of the Invention

[0003] Based on this, it is necessary to provide a makeup brush that solves the above technical problems.

[0004] A glue-free one-piece makeup brush, comprising:

[0005] A brush handle; a brush head assembly, the brush head assembly is injection-molded and integrally formed with the brush handle;

[0006] The brush head assembly includes a brush hair cluster, a sleeve and a plunger; at least two peripheral protrusions are arranged at intervals along the circumferential direction at the root of the brush hair cluster, and a first groove is arranged between the at least two peripheral protrusions; one end of the sleeve is connected to the brush handle; an annular boss is provided on the inner wall of the other end of the sleeve,

[0007] At least two load-bearing bosses are arranged at intervals along the circumferential direction on the end face of the annular boss facing the brush handle, and a second groove is arranged between the at least two load-bearing bosses. The peripheral protrusions are engaged with the second groove, and the load-bearing bosses are engaged with the first groove;

[0008] The plunger is embedded in the sleeve, the plunger is in clearance-free fit with the sleeve, and the peripheral protrusion is clamped between the plunger and the annular boss.

[0009] Optionally, the load-bearing bosses have the same height along the axial direction of the sleeve.

[0010] Optionally, the circumferential length of the second groove is greater than the circumferential length of the load-bearing boss, and the circumferential length of the peripheral protrusion is greater than the circumferential length of the first groove.

[0011] Optionally, the numbers of the second groove, the load-bearing boss, the peripheral protrusion, and the first groove are each 4.

[0012] Optionally, one end of the plunger facing the brush rod has a buffer cone, the outer diameter of the bottom of the buffer cone is smaller than the diameter of the plunger, a buffer cavity is formed between the buffer cone and the inner wall of the sleeve, and one end of the brush rod extends into the buffer cavity.

[0013] Optionally, the buffer cone extends out of the sleeve.

[0014] Optionally, the top of the buffer cone is arched.

[0015] A manufacturing method for any one of the above glue-free integrally formed makeup brushes includes:

[0016] Step 1: Insert the tuft of bristles into the sleeve from the end far away from the annular boss;

[0017] Step 2: Insert the plunger into the sleeve, and the plunger clamps the tuft of bristles in the sleeve to form the brush head assembly;

[0018] Step 3: Place the brush head assembly into the first mold;

[0019] Step 4: Close the first mold and the second mold, and injection mold the brush rod, and the brush head assembly and the brush rod are integrally formed by injection molding;

[0020] Step 5: Demold the first mold and the second mold to obtain the glue-free integrally formed makeup brush.

[0021] Optionally, Step 1 specifically includes: wrapping the tuft of bristles with a thin sheet having a tip, with the root of the tuft of bristles facing away from the tip of the thin sheet; aligning the tip of the thin sheet with the end of the sleeve far away from the annular boss, and inserting the tip of the thin sheet into the sleeve from the end far away from the annular boss to drive the tuft of bristles to protrude from the annular boss; pulling out the thin sheet, adjusting the tuft of bristles so that the peripheral protrusion engages with the second groove and the load-bearing boss engages with the first groove.

[0022] Optionally, before implementing step 3, it further includes: placing the brush head assembly into a fixture; placing the fixture into the first mold;

[0023] The fixture has a cylindrical cavity for accommodating the brush head assembly, and a retaining ring for supporting the brush head assembly is arranged in the cylindrical cavity;

[0024] Placing the brush head assembly into the fixture specifically includes: wrapping the thin sheet around the brush hair cluster, with the root of the brush hair cluster facing away from the tip of the thin sheet; aligning the tip of the thin sheet with one end of the cylindrical cavity, inserting the tip of the thin sheet into the fixture, driving the brush hair to extend from one side of the retaining ring to the other side, and making the annular boss abut against the retaining ring.

[0025] Beneficial effects:

[0026] The present application provides a glue-free integrally formed makeup brush. The brush head assembly is assembled by clamping the peripheral protrusion between the plunger and the annular boss, and then the brush head assembly is injection-molded and connected to the brush handle to obtain the makeup brush. It has fewer parts, is simple to manufacture, has fewer steps, and is firmly assembled. Glue bonding is omitted, making it more environmentally friendly. Description of the drawings

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0028] Figure 1 It is a schematic structural diagram of a makeup brush in an embodiment;

[0029] Figure 2 It is an exploded structural diagram of a makeup brush in an embodiment;

[0030] Figure 3 It is an exploded structural diagram of a brush head assembly in an embodiment;

[0031] Figure 4 It is a schematic structural diagram of a brush head assembly in an embodiment;

[0032] Figure 5 For one Figure 4 Cross-sectional view of the brush head assembly in the A-A direction;

[0033] Figure 6 It is a schematic structural diagram of a sleeve in an embodiment;

[0034] Figure 7 For one Figure 6Cross-sectional view of the middle casing in the B-B direction.

[0035] Figure 8 Is the top view of the casing in an embodiment;

[0036] Figure 9 Is the top view of the bristle cluster assembled on the casing in an embodiment;

[0037] Figure 10 Is the schematic structural view of the brush rod in an embodiment;

[0038] Figure 11 Is the front view of the fixture in an embodiment;

[0039] Figure 12 Is Figure 11 The cross-sectional view of the fixture in the C-C direction;

[0040] Figure 13 Is the schematic structural view of the fixture in an embodiment;

[0041] Figure 14 Is the schematic structural view of the thin sheet in an embodiment.

[0042] Among them, 100, cosmetic brush; 1, brush rod; 2, brush head assembly; 3, bristle cluster; 31, root; 4, peripheral protrusion; 41, first groove; 5, casing; 51, annular boss; 52, load-bearing boss; 53, second groove; 54, buffer cavity; 6, plunger; 7, buffer cone; 71, top; 72, bottom of buffer cone; 8, buffer boss; 9, accommodation cavity; 10, socket; 11, fixture; 12, retaining ring; 13, cylindrical cavity; 14, thin sheet.

[0043] The realization of the purpose, functional features and advantages of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0044] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0045] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0046] In addition, the descriptions involving "first", "second", etc. in the present invention are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, "and / or" throughout the text includes three scenarios. Taking A and / or B as an example, it includes the technical solution of A, the technical solution of B, and the technical solution where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or inability to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0047] Reference Figures 1 to 10 , which shows a glue-free integrally formed makeup brush 100 of an embodiment. The makeup brush 100 includes a brush rod 1 and a brush head assembly 2. The brush head assembly 2 is integrally injection-molded and connected to the brush rod 1; the brush head assembly 2 includes a tuft of bristles 3, a sleeve 5, and a plunger 6; the root 31 of the tuft of bristles 3 has at least two peripheral protrusions 4 arranged at intervals in the circumferential direction, and a first groove 41 is provided between the at least two peripheral protrusions 4; one end of the sleeve 5 is connected to the brush rod 1; an annular boss 51 is provided on the inner wall of the other end of the sleeve 5, and the end face of the annular boss 51 facing the brush rod 1 has at least two load-bearing bosses 52 arranged at intervals in the circumferential direction, and a second groove 53 is provided between the at least two load-bearing bosses 52. The peripheral protrusion 4 engages with the second groove 53, and the load-bearing boss 52 engages with the first groove 41; the plunger 6 is embedded in the sleeve 5, and the plunger 6 is in clearance-free fit with the sleeve 6, and the peripheral protrusion 4 is clamped between the plunger 6 and the annular boss 51.

[0048] In this embodiment, the peripheral protrusion 4 engages with the second groove 53, and the load-bearing boss 52 engages with the first groove 41. The peripheral protrusion 4 is clamped between one end of the plunger 6 and the annular boss 51 to assemble the brush head assembly 2, and then the brush head assembly 2 is integrally injection-molded and connected to the brush rod 1 to manufacture the makeup brush. It has few parts, is simple to manufacture, has few steps, and is firmly assembled.

[0049] In this embodiment, the materials of the brush rod 1, the tuft of bristles 3, the sleeve 5, and the plunger 6 are recyclable and / or degradable materials, such as PLA and / or PET and / or PBT. In this embodiment, the tuft of bristles 3 is made of a different material from the brush rod 1, the sleeve 5, and the plunger 6. For example, the tuft of bristles 3 is made of PBT, and the brush rod 1, the sleeve 5, and the plunger 6 are made of PET. In another embodiment, the brush rod 1, the tuft of bristles 3, the sleeve 5, and the plunger 6 are made of the same material.

[0050] During the injection molding process, if the melt temperature of the brush rod 1 reaches above 200 degrees Celsius, it will cause partial or complete deformation of the bristle cluster 3. In the present invention, by clamping the peripheral protrusion 4 between the plunger 6 and the annular boss 51, the plunger 6 prevents the injection melt of the brush rod from directly acting on the bristle cluster 3 during the injection molding process, which may cause the bristle cluster 3 to melt and deform. At the same time, during the injection molding process, the pressure set by the machine is above 30 Bar, and the injection pressure is about 100 Mpa. The strong pressure during injection acts on the plunger 6 and may break or partially break the peripheral protrusion 4. In the present invention, by providing the load-bearing boss 52 to support the plunger 6, it is avoided that the plunger 6 breaks or partially breaks the peripheral protrusion 4 due to the impact of the injection pressure during the injection molding process, which may cause the bristle cluster 3 to detach from or be easily detached from the sleeve 5.

[0051] In this embodiment, the heights of the load-bearing bosses 52 along the axial direction of the sleeve 5 are equal. The circumferential length of the second groove 53 is greater than the circumferential length of the load-bearing boss 52, and the circumferential length of the peripheral protrusion 4 is greater than the circumferential length of the first groove 41. In this way, the bristle cluster 3 is firmly clamped to the sleeve 5, and it is avoided that the peripheral protrusion 4 is easily deformed during use, causing the bristle cluster 3 to detach from the sleeve 5. In this embodiment, the height of the load-bearing boss 52 is equal to or slightly less than the height of the peripheral protrusion 4, so that the plunger 6 and the annular boss 51 form a certain pressing force on the peripheral protrusion 4, further avoiding that the peripheral protrusion 4 is easily deformed during use, causing the bristle cluster 3 to detach from the sleeve 5.

[0052] Specifically, the numbers of the second groove 53, the load-bearing boss 52, the peripheral protrusion 4, and the first groove 41 are 3 or 4 respectively. In this embodiment, 3 or 4 peripheral protrusions 4 are evenly spaced along the circumference of the root 31 of the bristle cluster 3; 3 or 4 load-bearing bosses 52 are evenly spaced along the circumference of the end face of the annular boss 51 facing the brush rod 1. In this way, it is avoided that the peripheral protrusion 4 is too small in size due to too many numbers and is not firm, and the peripheral protrusion 4 is easily deformed during use, causing the bristle cluster 3 to detach from the sleeve 5; it is avoided that the number or size of the load-bearing bosses 52 is too small, resulting in insufficient supporting force during the injection molding process to withstand the impact of the injection pressure on the plunger 6, breaking or partially breaking the peripheral protrusion 4, and causing the bristle cluster 3 to detach from or be easily detached from the sleeve 5.

[0053] In one embodiment, the plunger 6 has a buffer cone 7 at one end facing the brush rod 1. The outer diameter of the bottom 72 of the buffer cone is smaller than the diameter of the plunger 6. The diameter of the plunger 6 is equal to the inner diameter of the sleeve 5 to form a clearance-free fit. It should be noted that the diameter of the plunger 6 can be slightly larger than the inner diameter of the sleeve 5 to form an interference fit. The plunger 6 is connected to the bottom 71 of the buffer cone to form a buffer boss 8. The buffer cone 7 and the inner wall of the sleeve 5 form a buffer cavity 54. When injection molding integrally, the material melts into the buffer cavity 54. One end of the brush rod 1 extends into the buffer cavity 54, and one end of the brush rod 1 forms a socket 10 adapted to the buffer cavity 54, making the connection between the brush rod 1 and the sleeve 5 more firm.

[0054] In this embodiment, the buffer cone 7 extends out of the sleeve 5. Correspondingly, a receiving cavity 9 is provided at one end of the brush handle, and the buffer cone 7 extends into the receiving cavity 9. In another embodiment, the buffer cone 7 does not extend out of the sleeve 5, and correspondingly, the length of the sleeve 5 is increased.

[0055] Specifically, the top 71 of the buffer cone 7 is arched. In this embodiment, the top 71 of the buffer cone 7 is round and arched, and at this time, the buffer cone 7 as a whole is a paraboloid of revolution. In this way, the buffering ability of the buffer cone 7 during the injection molding process is further improved.

[0056] The present invention also provides a manufacturing method for the above glue-free integrally formed makeup brush, including:

[0057] Step 1: Insert the brush tuft 3 into the sleeve 5 from the end far away from the annular boss 51; In this embodiment, the step of manufacturing the brush tuft includes melting the bristles at one end of the brush tuft, which is called the root, to form a plate with a width wider than the root of the brush tuft, thereby forming a peripheral protrusion 4.

[0058] In this embodiment, Step 1 specifically includes: wrapping the brush tuft 3 with a thin sheet 14 having a tip, with the root of the brush tuft 3 facing away from the tip of the thin sheet 14; aligning the tip of the thin sheet 14 with the end of the sleeve 5 far away from the annular boss 51, and inserting the tip of the thin sheet 14 into the sleeve 5 from the end far away from the annular boss 51 to drive the brush tuft 3 to extend out from the annular boss 51; withdrawing the thin sheet 14 and adjusting the brush tuft 3 so that the peripheral protrusion 4 engages with the second groove 53 and the load-bearing boss 52 engages with the first groove 41. By wrapping the brush tuft 3 with the thin sheet 14 having a tip, the bristles of the brush tuft 3 are tightly wrapped and not blocked by the sleeve 5, so that the brush tuft 3 can enter the sleeve 5 from the end far away from the annular boss 51, and the peripheral protrusion 4 is snapped onto the annular boss 51, instead of forcibly snapping the peripheral protrusion 4 into the sleeve 5 from the end close to the annular boss 51, thus causing damage to the peripheral protrusion 4.

[0059] Step 2: Insert the plunger 6 into the sleeve 5, and the plunger 6 snaps the brush tuft 3 in the sleeve 5 to form a brush head assembly 2;

[0060] Step 3: Place the brush head assembly 2 into the first mold.

[0061] Before implementing Step 3, it further includes: placing the brush head assembly 2 into the fixture 11, and placing the fixture 11 into the first mold; as Figures 11 - 13 shown, the fixture 11 has a cylindrical cavity 13 for accommodating the brush head assembly 2, and a retaining ring 12 for supporting the brush head assembly 2 is arranged in the cylindrical cavity 13.

[0062] Placing the brush head assembly 2 into the fixture 11 specifically includes: wrapping the bristle cluster 3 with the thin sheet 14, with the tip of the bristle cluster 3 facing away from the thin sheet 14; aligning the tip of the thin sheet 14 with one end of the cylindrical cavity 13, inserting the tip of the thin sheet 14 into the fixture 11, driving the bristles to extend from one side of the retaining ring 12 to the other side, making the end face of the sleeve 5 abut against the retaining ring 12, with the bristle cluster 3 located inside the cylindrical cavity 13 and the buffer cone 7 facing the second mold. In this embodiment, as Figure 14 shown, the thin sheet 14 has a structure with one end large and the other end small, and the tip of the thin sheet 14 refers to the relatively smaller end; in this embodiment, the thin sheet 14 is a plastic thin sheet 14.

[0063] Step 4: Close the first mold and the second mold, and injection-mold the brush rod 1. The brush head assembly 2 and the brush rod 1 are integrally injection-molded and connected; in this embodiment, the first mold is a male mold, the second mold is a female mold, and the second mold has a cavity for the brush rod 1.

[0064] Step 5: Demold the first mold and the second mold to obtain a glue-free integrally molded makeup brush.

[0065] The above is only the preferred embodiment of the present invention, and it does not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A glue-free one-piece cosmetic brush, comprising: Brush rod; Brush head assembly, Characterized in that the brush head assembly is integrally connected with the brush rod by injection molding; The brush head assembly comprises a bristle cluster, a sleeve and a plunger; the root of the bristle cluster has at least two peripheral protrusions arranged circumferentially and spaced apart, and a first groove is provided between the at least two peripheral protrusions; one end of the sleeve is connected to the brush rod; the inner wall of the other end of the sleeve is provided with an annular boss, The end surface of the annular boss facing the brush rod has at least two load-bearing bosses arranged at intervals along the circumferential direction, a second groove is provided between the at least two load-bearing bosses, the peripheral protrusion is engaged with the second groove, and the load-bearing boss is engaged with the first groove; The plunger is embedded in the sleeve, the plunger and the sleeve are matched without clearance, and the peripheral protrusion is clamped between the plunger and the annular boss.

2. The glue-free one-piece cosmetic brush according to claim 1, characterized in that: The load-bearing bosses have the same height along the axial direction of the sleeve.

3. The glue-free one-piece cosmetic brush according to claim 2, characterized in that: The circumferential length of the second groove is greater than the circumferential length of the load-bearing boss, and the circumferential length of the peripheral protrusion is greater than the circumferential length of the first groove.

4. The glue-free one-piece cosmetic brush according to claim 1, characterized in that: The number of the second groove, the load-bearing boss, the peripheral protrusion and the first groove are respectively four.

5. The glue-free one-piece cosmetic brush according to claim 1, characterized in that: The plunger has a buffer cone at one end facing the brush rod, the outer diameter of the bottom of the buffer cone is smaller than the diameter of the plunger, the buffer cone and the inner wall of the sleeve form a buffer cavity, and one end of the brush rod extends into the buffer cavity.

6. The glue-free one-piece cosmetic brush according to claim 5, characterized in that: The buffer cone extends out of the sleeve.

7. The glue-free one-piece cosmetic brush according to claim 5, characterized in that: The top of the buffer cone is arched.

8. A method for manufacturing a glue-free one-piece cosmetic brush according to any one of claims 1 to 7, comprising: Step 1: Extend the bristle cluster from the end away from the annular boss into the sleeve; Step 2: inserting the plunger into the sleeve, and the plunger clamps the bristle cluster to the sleeve to form the brush head assembly; Step 3: Place the brush head assembly into the first mold; Step 4: closing the first mold and the second mold, injection molding the brush rod, and connecting the brush head assembly and the brush rod by injection molding; Step 5: demoulding the first mold and the second mold to obtain the glue-free one-piece cosmetic brush.

9. The method according to claim 8, characterized in that: Step 1 specifically includes: wrapping the bristle cluster with a thin sheet with a pointed end so that the root of the bristle cluster faces away from the tip of the thin sheet; aligning the tip of the thin sheet with the end of the sleeve away from the annular boss so that the tip of the thin sheet enters the sleeve from the end away from the annular boss, driving the bristle cluster to extend from the annular boss; pulling out the thin sheet and adjusting the bristle cluster so that the peripheral protrusion engages with the second groove and the load-bearing boss engages with the first groove.

10. The manufacturing method according to claim 9, characterized in that: Before implementing step 3, the method further includes: placing the brush head assembly into a fixture; placing the fixture into the first mold; The fixture has a cylindrical cavity for accommodating the brush head assembly, and a retaining ring for supporting the brush head assembly is arranged in the cylindrical cavity; Placing the brush head assembly into the fixture specifically includes: wrapping the thin sheet around the bristle cluster so that the root of the bristle cluster faces away from the tip of the thin sheet; aligning the tip of the thin sheet with one end of the cylindrical cavity so that the tip of the thin sheet enters the fixture, driving the bristles to extend from one side of the retaining ring to the other side, so that the annular boss abuts against the retaining ring.

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