Toothbrush handle injection mold and toothbrush
By setting a flow divider and a sliding block in the toothbrush handle injection mold, the flow of the rubber material is controlled, solving the flow pattern problem during pearlescent masterbatch injection and achieving a high-quality appearance and feel for the toothbrush handle.
Patent Information
- Application Number
- CN202422968239.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-03
- Publication Date
- 2025-11-04
- Estimated Expiration
- 2034-12-03
AI Technical Summary
Existing toothbrush handles are prone to flow lines during injection molding with added pearlescent masterbatch, affecting their appearance quality.
A toothbrush handle injection mold is used, with a flow divider and sliding block to control the flow direction of the mixed material, ensuring uniform filling, avoiding turbulence and backflow, and reducing flow marks.
It improves the appearance and feel of the toothbrush handle, reduces flow marks, and enhances its aesthetic appeal.
Smart Images
Figure CN223507578U_ABST
Abstract
Description
[Technical Field]
[0002] This utility model relates to the field of oral hygiene products technology, and in particular to a toothbrush handle injection mold and a toothbrush. [Background Technology]
[0004] In recent years, people have paid increasing attention to the importance of oral health, and toothbrushes, as an essential tool for cleaning teeth in daily life, can clean teeth and the oral cavity. Its main function is to remove food debris, bacteria, and plaque from the surface of teeth. Through brushing, the bristles of the toothbrush can effectively clean all surfaces of the teeth.
[0005] In the prior art, in order to improve the aesthetics of toothbrush handles, various colors of pearlescent masterbatch are added to the plastic. However, due to the limitations of the injection molding process, toothbrush handles with added pearlescent masterbatch often produce various flow lines during injection molding, thus affecting the overall aesthetics of the toothbrush. [Utility Model Content]
[0007] To address the technical problem of flow marks easily occurring when adding pearlescent masterbatch during injection molding of plastic toothbrush handles, this utility model proposes a toothbrush handle injection mold and a toothbrush.
[0008] This utility model is achieved by the following technical solution:
[0009] A toothbrush handle injection mold includes an upper mold and a lower mold, with a cavity between the upper mold and the lower mold for forming the toothbrush handle. The lower mold has an injection port for injecting a pearlescent masterbatch into the cavity. The upper mold has a flow divider device that is inserted into the cavity during injection and withdrawn from the cavity after injection to reduce flow marks on the surface of the toothbrush handle.
[0010] As described above, in a toothbrush handle injection mold, the flow distribution device includes a flow distribution component and a sliding block that drives the flow distribution component to move up and down.
[0011] As described above, in a toothbrush handle injection mold, the sliding block is provided with a mounting hole for installing a flow divider assembly, and the flow divider assembly is provided with a first protrusion and a second protrusion, the first protrusion and the second protrusion forming a locking part that engages and is fixed with the mounting hole.
[0012] As described above, in a toothbrush handle injection mold, the flow-dividing component is a flow-dividing needle, the shape of the flow-dividing component is cylindrical, and the diameter of the flow-dividing component is 2-6 mm.
[0013] In the toothbrush handle injection mold described above, the distance L1 between the center of the injection port and the farthest point of the bottom of the cavity is 10-16 mm, and the distance L2 between the center of the flow distribution component and the farthest point of the bottom of the cavity is 6-14 mm.
[0014] As described above, in a toothbrush handle injection mold, after the toothbrush handle is injection molded, the lower mold is further injection molded with a soft overmolding material to cover the injection port.
[0015] The toothbrush handle injection mold described above, wherein the soft overmolding is made of TPE material.
[0016] In another aspect, this utility model also proposes a toothbrush, including a toothbrush head and a toothbrush handle injection molded from the above-mentioned toothbrush handle injection mold, wherein the toothbrush handle has a diversion mark left after injection molding.
[0017] As described above, the toothbrush handle is provided with a raised component for anti-slip purposes, the raised component being composed of a plurality of small protrusions.
[0018] As described above, the toothbrush head is provided with a bristle assembly for cleaning oral hygiene, the bristle assembly including a plurality of first bristles for antibacterial purposes and a plurality of second bristles;
[0019] The first bristle has a dual-core structure. The outer core of the first bristle is made of a mixture of graphene and polyester materials, and the inner core of the first bristle is made of polyester materials.
[0020] The second bristles are made of polyester material.
[0021] Compared with the prior art, the toothbrush handle injection mold and toothbrush proposed in this utility model have the following beneficial effects:
[0022] 1. The toothbrush handle injection mold proposed in this utility model is equipped with a flow diversion device. The flow diversion device can control the flow direction of the mixed material in the cavity, ensuring that the mixed material can be filled evenly, avoiding turbulence and backflow caused by uneven flow, reducing flow marks on the surface of the toothbrush handle, and improving the appearance quality of the toothbrush.
[0023] 2. The flow-diverting component proposed in this invention enables precise control of the flow direction of the mixed rubber compound during injection molding and ensures a smoother flow, avoiding turbulence and backflow caused by cavity obstruction or irregularities during injection molding, which would otherwise result in flow lines on the toothbrush handle surface.
[0024] 3. The relative arrangement of the glue injection port and the flow distribution device in this utility model can better control the flow path of the mixed glue in the cavity, thereby avoiding turbulence and backflow, reducing flow marks on the toothbrush handle surface, and improving the appearance quality and feel of the toothbrush. [Attached Image Description]
[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.
[0027] Figure 1 This is a three-dimensional structural diagram of the present invention;
[0028] Figure 2 This is another schematic diagram of the three-dimensional structure of the present invention;
[0029] Figure 3 This is an exploded view of the present invention;
[0030] Figure 4 This is an exploded view of the diversion device of this utility model;
[0031] Figure 5 This is a schematic diagram of the toothbrush structure of this utility model;
[0032] Figure 6 This is a schematic diagram of the back of the toothbrush of this utility model;
[0033] Figure 7 This is a schematic diagram of the soft coating structure of this utility model.
Detailed Implementation Methods
[0035] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.
[0036] Specific embodiments, combined with Figures 1 to 7 As shown, the technical solution of this utility model is further illustrated. A toothbrush handle injection mold includes an upper mold 10 and a lower mold 11. A cavity 12 for forming the toothbrush handle is provided between the upper mold 10 and the lower mold 11. The lower mold 11 has an injection port 13 for injecting a mixture of pearlescent masterbatch into the cavity 12. The upper mold 10 has a flow divider 20. The flow divider 20 is inserted into the cavity 12 during injection and withdraws from the cavity 12 after injection to reduce flow marks on the surface of the toothbrush handle. This injection mold, through the flow divider 20, can control the flow direction of the mixed material in the cavity 12, ensuring that the mixed material is evenly filled, avoiding turbulence and backflow caused by uneven flow, reducing flow marks on the surface of the toothbrush handle, and improving the appearance quality of the toothbrush.
[0037] Furthermore, as a preferred embodiment of this solution and not a limitation thereof, the diversion device 20 includes a diversion component 21 and a sliding block 22 that drives the diversion component 21 to move up and down.
[0038] The sliding block 22 is provided with a mounting hole 221 for installing the diversion component 21. The diversion component 21 is provided with a first protrusion 211 and a second protrusion 212. The first protrusion 211 and the second protrusion 212 form a locking part 23 that is engaged and fixed with the mounting hole 221.
[0039] In this embodiment, the flow diversion component enables precise control of the flow direction of the mixed material during injection molding and ensures a smoother flow of the mixed material. This avoids turbulence and backflow caused by cavity obstruction or irregularity during injection molding, which would otherwise result in flow lines on the toothbrush handle surface. The locking design allows the flow diversion component and the sliding block to form a stable structure, which helps to enhance the stability and durability of the mold.
[0040] Furthermore, as a preferred embodiment of this solution and not a limitation thereof, the diversion component 21 is a diversion needle, the shape of the diversion component 21 is cylindrical, and the diameter of the diversion component 21 is 2-6 mm.
[0041] In this embodiment, the diameter of the diversion component 21 is 4mm. In the specific implementation process, the diameter of the diversion component 21 can be adjusted according to the width of the product.
[0042] Furthermore, as a preferred embodiment of this solution and not a limitation, the distance L1 between the center of the injection port 13 and the farthest end of the bottom of the cavity 12 is 10-16 mm, and the distance L2 between the center of the diversion component 21 and the farthest end of the bottom of the cavity 12 is 6-14 mm.
[0043] In this embodiment, the distance L1 between the center of the injection port 13 and the farthest point of the bottom of the cavity 12 is 13mm, and the distance L2 between the center of the flow divider 21 and the farthest point of the bottom of the cavity 12 is 10mm. In specific implementation, the distances between the centers of the injection port 13 and the farthest point of the bottom of the cavity 12 can be adjusted according to the actual product specifications. By designing the positional relationship between the injection port and the flow divider, it can be ensured that the mixed material being injected starts filling from the top of the cavity and gradually fills towards the bottom, avoiding accumulation of the mixed material at the injection port and reducing flow marks near the injection port.
[0044] Furthermore, as a preferred embodiment of this solution and not a limitation thereof, the injection port 13 is located below the lower mold 11, so that the injection port 13 is on the back of the toothbrush handle, and the diversion device 20 is located in the upper mold 10, so that the diversion mark caused by the diversion device 20 is on the front of the toothbrush handle.
[0045] The upper mold 10 and the lower mold 11 are adjustable so that the glue injection port 13 is on the front of the toothbrush handle, and the flow diversion mark caused by the flow diversion device 20 is on the back of the toothbrush handle 40. In short, it is only necessary to ensure that the glue injection port 13 and the flow diversion device 20 can be set relative to each other.
[0046] In this embodiment, the relative arrangement of the injection port and the flow divider allows for better control of the flow path of the mixed material in the toothbrush handle cavity, thereby avoiding turbulence and backflow, reducing flow marks on the toothbrush handle surface, and improving the appearance and feel of the toothbrush. At the same time, it also ensures that the mixed material can flow evenly in the cavity, avoiding problems such as material accumulation or poor flow, thus improving the quality and consistency of injection molding.
[0047] Furthermore, as a preferred embodiment of this solution and not a limitation, the residence time of the diverting component 21 in the cavity 12 is set during the injection molding of the toothbrush handle. The residence time is greater than or equal to the time required for the pearlescent masterbatch to fill the bottom of the cavity 12 and the area around the diverting component 21.
[0048] The time required for the pearlescent masterbatch to fill the bottom of the mold cavity 12 and around the distribution component 21 can be determined by the actual injection port 13 of the injection material or by setting the injection time of the first stage, based on the injection time displayed when the injection is completed by the injection machine (not shown in the figure).
[0049] In addition, it should be noted that the diversion component 21 should not stay in the cavity 12 for too long, otherwise the pearlescent masterbatch will cool down, affecting the injection molding and causing appearance defects on the surface of the toothbrush handle.
[0050] In this embodiment, the time T1 required for the pearlescent masterbatch to fill the bottom of the cavity 12 and around the flow divider 21 is 4-7 seconds, and the residence time T2 of the flow divider 21 in the cavity 12 is 5-8 seconds, that is, time T2 is 1 second longer than T1. The longer residence time T2 of the flow divider in the toothbrush handle cavity than the filling time T1 ensures that the injection-molded mixed material can completely fill the cavity, ensuring consistent density in all parts of the cavity, reducing defects such as surface flow lines and bubbles, and improving the appearance quality and feel of the toothbrush.
[0051] Furthermore, as a preferred embodiment of this solution and not a limitation, when the flow diversion component 21 exits the cavity 12, the injection pressure and injection time of the injection molding machine need to be set to 0, so that the flow of the pearlescent masterbatch material stops in the cavity 12, and the state in which the injection pressure and injection time of the injection molding machine are both 0 is maintained for 0.3-2 seconds.
[0052] In this embodiment, the flow of the pearlescent masterbatch material is immediately stopped when the flow divider component exits the cavity. This prevents the pearlescent masterbatch material from flowing back during the exit process of the flow divider component, which would otherwise cause a large number of flow marks on the surface of the toothbrush handle.
[0053] Furthermore, as a preferred embodiment of this solution and not a limitation, the injection temperature T during injection molding is 180-210°C.
[0054] Furthermore, as a preferred embodiment of this solution and not a limitation, the pearlescent masterbatch is a mixture of pearlescent masterbatch and plastic material.
[0055] The plastic compound is made of PP, PS, or TPE materials.
[0056] Furthermore, as a preferred embodiment of this solution and not a limitation, after the toothbrush handle is injection molded, the lower mold 11 is also injection molded with a soft overmolding 14 for wrapping the injection port 13.
[0057] The soft overlay 14 is made of TPE material.
[0058] In this embodiment, the soft overlay can effectively cover the glue injection port, preventing external dust and dirt from entering and improving the toothbrush's sealing performance. At the same time, the soft overlay can also provide a smoother and more aesthetically pleasing appearance, improving the toothbrush's appearance quality and feel.
[0059] This embodiment also provides a toothbrush, which includes a toothbrush head 30 and a toothbrush handle 40 injection molded from the toothbrush handle injection mold as described above. The toothbrush handle 40 is provided with a diversion mark 41 left after injection molding.
[0060] Furthermore, as a preferred embodiment of this solution and not a limitation thereof, the toothbrush handle 40 is also provided with a protrusion component 42 for anti-slip purposes, the protrusion component 42 being composed of a plurality of small protrusions, the plurality of small protrusions being hexagonal protrusions.
[0061] In this embodiment, the raised component is composed of multiple hexagonal protrusions, which can provide more contact points, greatly increasing the friction between the fingers and the brush handle, thereby significantly improving the anti-slip ability. At the same time, the hexagonal protrusions can fit the shape of the fingers more closely, reducing the discomfort of holding the brush handle and improving the user experience.
[0062] Furthermore, as a preferred embodiment of this solution and not a limitation thereof, the toothbrush head 30 is provided with a bristle assembly 31 for cleaning oral hygiene, the bristle assembly 31 including a plurality of first bristles 311 for antibacterial purposes and a plurality of second bristles 312.
[0063] In this embodiment, the bristles with antibacterial function can not only effectively clean oral hygiene, but also effectively inhibit the growth and reproduction of bacteria in the mouth, reduce the number of bacteria in the mouth, protect the user's oral health, and at the same time reduce the accumulation of bacteria on the bristles, improve the toothbrush's antibacterial and bactericidal ability, so that the user can more effectively remove dirt and bacteria from the mouth.
[0064] Furthermore, as a preferred embodiment of this solution and not a limitation thereof, the first bristle 311 has a dual-core structure, the outer core of the first bristle 311 is made of a mixture of graphene and polyester materials, the inner core of the first bristle 311 is made of polyester materials, and the second bristle 312 is made of nylon materials.
[0065] In this embodiment, graphene is a two-dimensional carbon nanomaterial with excellent bactericidal and bacteriostatic effects. Using it to make the first bristles can ensure that the growth and reproduction of bacteria can be effectively inhibited when cleaning oral hygiene. At the same time, graphene is composed of carbon elements and is non-toxic, so it can achieve long-term antibacterial and antimicrobial effects.
[0066] In addition, the first bristle has a double-core structure, which gives it excellent antibacterial effect, as well as a certain degree of mechanical strength and wear resistance. This makes the first bristle less prone to falling out while still having antibacterial ability, thus extending its service life and giving the toothbrush long-term antibacterial ability.
[0067] The working principle of this embodiment is as follows:
[0068] The toothbrush proposed in this utility model can greatly reduce the generation of flow lines on the surface of the toothbrush handle 40 through the flow diversion device 20, thereby improving the appearance quality and aesthetics of the toothbrush. The specific principle is as follows:
[0069] During injection molding, the sliding block 22 drives the flow distribution component 21 to be inserted into the cavity 12, which can ensure that the rubber mixed with pearlescent masterbatch can be filled from the top of the cavity 12 and then gradually filled to the bottom of the cavity 12. This avoids the accumulation of the rubber mixed with pearlescent masterbatch at the injection port 13, reduces the generation of flow marks near the injection port 13, and at the same time, by precisely controlling the flow direction of the rubber mixed with pearlescent masterbatch, it avoids turbulence and backflow caused by uneven flow, and reduces the flow marks generated on the surface of the toothbrush handle 40.
[0070] When the toothbrush handle 40 is injection molded, the sliding block 22 drives the flow distribution component 21 to exit the cavity 12. A layer of soft rubber 23 will also be injection molded on the back of the toothbrush handle 40 to cover the injection port 13, which can cover the flow lines near the injection port and also provide a smoother and more beautiful appearance for the toothbrush handle 40.
[0071] Those skilled in the art should understand that the above description is one embodiment provided in conjunction with specific content, and does not imply that the specific implementation of this utility model is limited to these descriptions. Furthermore, due to differences in industry naming conventions, it is not limited to the above names or English names. Any methods or structures similar to or identical to those of this utility model, or any technical deductions or substitutions made based on the concept of this utility model, should be considered within the scope of protection of this utility model.
Claims
1. A toothbrush handle injection mold, characterized in that, The device includes an upper mold (10) and a lower mold (11). A cavity (12) for forming a toothbrush handle is provided between the upper mold (10) and the lower mold (11). The lower mold (11) is provided with an injection port (13) for injecting a pearlescent masterbatch into the cavity (12). The upper mold (10) is provided with a flow divider (20). The flow divider (20) is inserted into the cavity (12) during injection and withdraws from the cavity (12) after injection to reduce flow marks on the surface of the toothbrush handle.
2. The toothbrush handle injection mold according to claim 1, characterized in that, The diversion device (20) includes a diversion component (21) and a sliding block (22) that drives the diversion component (21) to move up and down.
3. The toothbrush handle injection mold according to claim 2, characterized in that, The sliding block (22) is provided with a mounting hole (221) for installing the diversion component (21). The diversion component (21) is provided with a first protrusion (211) and a second protrusion (212). The first protrusion (211) and the second protrusion (212) form a locking part (23) that is engaged and fixed with the mounting hole (221).
4. The toothbrush handle injection mold according to claim 2, characterized in that, The diversion component (21) is a diversion needle, the shape of the diversion component (21) is cylindrical, and the diameter of the diversion component (21) is 2-6mm.
5. The toothbrush handle injection mold according to claim 2, characterized in that, The distance L1 between the center of the injection port (13) and the farthest point at the bottom of the cavity (12) is 10-16 mm, and the distance L2 between the center of the diversion assembly (21) and the farthest point at the bottom of the cavity (12) is 6-14 mm.
6. The toothbrush handle injection mold according to claim 1, characterized in that, After the toothbrush handle is injection molded, the lower mold (11) is also injection molded with a soft overmolding (14) to wrap the injection port (13).
7. A toothbrush handle injection mold according to claim 6, characterized in that, The soft overlay (14) is made of TPE material.
8. A toothbrush, characterized in that, Includes a toothbrush head (30) and a toothbrush handle (40) injection molded from the toothbrush handle injection mold of any one of claims 1-7, wherein the toothbrush handle (40) has a flow mark (41) left after injection molding.
9. A toothbrush according to claim 8, characterized in that, The toothbrush handle (40) is provided with a raised component (42) for anti-slip purposes, the raised component (42) being composed of a plurality of small protrusions.
10. A toothbrush according to claim 8, characterized in that, The toothbrush head (30) is provided with a bristle assembly (31) for cleaning oral hygiene, the bristle assembly (31) including a plurality of first bristles (311) for antibacterial purposes and a plurality of second bristles (312). The first bristle (311) has a dual-core structure. The outer core of the first bristle (311) is made of a mixture of graphene and polyester materials, and the inner core of the first bristle (311) is made of polyester materials. The second bristle (312) is made of polyester material.