Preparation method of electric toothbrush head, electric toothbrush head and electric toothbrush

Abstract

The invention relates to the technical field of electric toothbrushes, in particular to a preparation method of an electric toothbrush head, the electric toothbrush head and an electric toothbrush. The preparation method comprises the steps that the hard rubber brush handle and the multiple bristle planting pieces are subjected to injection molding, the multiple bristle planting parts integrally formed with the hard rubber brush handle are formed at one end of the hard rubber brush handle, and the bristle planting pieces are formed independent of the hard rubber brush handle; positioning and fixing the hard rubber brush handle and the bristle planting pieces in a bristle planting clamp of bristle planting equipment, wherein the plurality of bristle planting pieces are arranged around all bristle planting parts by one circle; respectively implanting the bristle bundles into the pores of the bristle implanting piece and the bristle implanting part through bristle implanting equipment, carrying out non-contact welding, heating and melting on the bottom ends of the bristle bundles to form a mushroom-head-shaped molten mass at the bottom end of each bristle bundle, and then pressing the mushroom-head-shaped molten mass into the corresponding pores; and placing the hard rubber brush handle implanted with the bristle bundle and the bristle planting piece in a rubber coating mold together with the bristle planting insert for injection molding of soft rubber, so that the soft rubber coats the surface of one end of the hard rubber brush handle and coats the bristle planting part and the bristle planting piece.

Description

Technical Field

[0001] This invention relates to the field of electric toothbrush technology, and in particular to a method for preparing an electric toothbrush head, an electric toothbrush head, and an electric toothbrush. Background Technology

[0002] An electric toothbrush is an oral care device that uses an electric motor as a driving source, which drives the brush head to generate high-frequency mechanical vibrations through a transmission mechanism. The periodic vibrations of the bristles then break down toothpaste foam and deeply clean between teeth. Compared to traditional manual toothbrushes, which rely on the user's wrist for cleaning, electric toothbrushes, through the stable high-frequency kinetic energy provided by their electromechanical system, significantly improve the efficiency of plaque removal and the controllability of the cleaning process. Consequently, their market acceptance and consumer preference are showing a continuous upward trend.

[0003] The brush head is a key component of an electric toothbrush. Currently, during the brush head manufacturing process, the bristle bundles are directly fixed to the bristle implantation holes on the hard plastic handle using ultrasonic welding. While this arrangement allows the bristles to fully receive the high-frequency vibrations generated by the motor through direct transmission from the hard plastic handle, ensuring effective tooth cleaning, the excessive vibration intensity can easily damage the oral cavity and gums, resulting in poor user comfort. Furthermore, ultrasonic welding makes the plastic material of the brush head brittle, making it prone to breakage and injury, leading to a high defect rate and increased costs. Summary of the Invention

[0004] This invention provides a method for preparing an electric toothbrush head, an electric toothbrush head, and an electric toothbrush, to solve the problems of bristles being directly fixed to the bristle implantation holes on a hard plastic handle, resulting in excessive vibration intensity, easy damage to the oral cavity and gums, poor comfort during use, brittle plastic material in the brush head, easy breakage and injury, high defect rate, and increased cost.

[0005] This invention discloses a method for preparing an electric toothbrush head, comprising the following steps:

[0006] Injection-molded hard plastic brush handle and multiple bristle implants, wherein multiple bristle implants are integrally formed on one end of the hard plastic brush handle, and the bristle implants are formed independently of the hard plastic brush handle. The hard rubber brush handle and the hair implantation component are positioned and fixed in the hair implantation clamp of the hair implantation equipment, wherein a plurality of the hair implantation components are arranged around all the hair implantation parts. The bristle insert is shaped according to the bristle bundle shape, and the bottom of the bristle bundle is non-contactly fused and heated to form a mushroom head-shaped molten body at the bottom of each bristle bundle; then the mushroom head-shaped molten body is implanted into the corresponding pores of the bristle insert and the bristle part respectively. The hard plastic brush handle with implanted bristle bundles and the bristle implanting component are placed together with the bristle implanting insert in a plastic encapsulation mold and soft plastic is injected. The soft plastic covers one end surface of the hard plastic brush handle and wraps the bristle implanting part and the bristle implanting component to form a soft plastic encapsulation layer. The soft plastic encapsulation layer covers one end of the hard plastic brush handle so that the outer surface of the user end of the brush head forms a central bristle implanting area and an edge bristle implanting area. The bristle implanting part is located in the central bristle implanting area, and the bristle implanting component is located in the edge bristle implanting area. The hard rubber brush handle, wrapped with a soft rubber coating, is sequentially removed from the coating mold and the bristle insert to obtain the electric toothbrush head.

[0007] Optionally, after the step of implanting the bristle bundles and before the step of injecting the soft glue, the following step is further included: The opening of the pore is subjected to heat compression treatment, which causes the hard rubber material of the hard rubber brush handle to shrink and cover the neck of the mushroom-shaped molten body, forming a mechanical locking structure after cooling.

[0008] Optionally, after the heat compression port treatment step and before the injection molding of the soft rubber step, the following step is further included: The connecting adhesive threads between adjacent flocking components are removed by punching.

[0009] Optionally, in the injection molding of the soft rubber step, the top of the tufted part and the tufted portion protrudes beyond the soft rubber overlay layer.

[0010] Optionally, in the step of injection molding the hard rubber brush handle, a protrusion is formed on one end of the hard rubber brush handle facing away from the bristle-forming part; in the step of injection molding the soft rubber, the soft rubber overlay layer covers the protrusion.

[0011] Optionally, in the step of injection molding the hard rubber brush handle and the multiple bristle implants, the pores of the bristle implants and the bristle implants are all blind holes.

[0012] Optionally, in the step of injection molding soft rubber, there is a gap between the bristle implant and one end of the hard rubber brush handle, so that the bristle implant does not contact the hard rubber brush handle, and the soft rubber overlay layer fills the gap.

[0013] Optionally, in the step of implanting the bristle bundle, the non-contact welding process is infrared welding, laser welding, induction welding, or microwave welding.

[0014] The present invention also discloses an electric toothbrush head, which is prepared by the above-described preparation method.

[0015] The present invention also discloses an electric toothbrush, including the electric toothbrush head described above.

[0016] The beneficial effects of the preparation method provided in this invention are as follows: In the electric toothbrush head prepared by the method of this invention, the bristle implantation part integrally formed on one end of the hard rubber handle is located in the middle bristle implantation area of ​​the brush head's use end, which can directly transmit the high-frequency vibration of the motor to ensure the brushing force of the core cleaning area and ensure the cleaning force of the teeth; while the bristle implantation parts set independently of the hard rubber handle are distributed in the edge bristle implantation area of ​​the brush head's use end, which are completely wrapped by the soft rubber coating layer to form a flexible buffer structure. Moreover, since they are set independently and not integrally formed with the hard rubber handle, the vibration transmitted from the hard rubber handle to the bristle implantation parts will be weakened. This reduces the vibration intensity of the edge bristles to avoid discomfort and damage to the gums and oral cavity, and increases the bristle swing amplitude through the elastic deformation of the soft rubber, thereby improving the fluid cleaning force. This achieves a functional balance between efficient cleaning in the middle bristle implantation area and comfortable gum protection in the edge bristle implantation area, making it less likely to damage the oral cavity and gums when using the brush head and improving the comfort of use. Attached Figure Description

[0017] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. In the accompanying drawings: Figure 1 This is a schematic diagram of the brush head according to an embodiment of the present invention; Figure 2 This is another schematic diagram of the brush head according to an embodiment of the present invention; Figure 3 This is an exploded view of the brush head according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the interstitial hair-planting area and the edge hair-planting area in an embodiment of the present invention; Figure 5 This is a schematic diagram of the hair-planting part and hair-planting component according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the tufted part according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the sunken platform according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the protrusion in an embodiment of the present invention.

[0018] The labels for the attached figures are as follows: 1. Hard rubber brush handle; 111. Bristle implantation area; 112. Protrusion; 113. Recessed platform; 2. Bristle implantation component; 3. Bristle bundle; 4. Soft rubber coating layer; 5. Middle bristle implantation area; 6. Edge bristle implantation area; 7. Pore; 8. Usage end. Detailed Implementation

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0020] This invention provides a method for preparing an electric toothbrush head. The preparation method includes the following steps: S1: Injection-molded hard plastic brush handle and multiple bristle implants, wherein multiple bristle implants are integrally formed on one end of the hard plastic brush handle, and the bristle implants are formed independently of the hard plastic brush handle. S2: Position and fix the hard rubber brush handle and the hair implantation component in the hair implantation fixture of the hair implantation equipment, wherein a plurality of the hair implantation components are arranged around all the hair implantation parts; S3: The bristle insert is used to shape the bristle bundle according to its shape. The bottom of the bristle bundle is heated and melted in a non-contact manner to form a mushroom-shaped molten body at the bottom of each bristle bundle. Then, the mushroom-shaped molten body is inserted into the corresponding pores of the bristle insert and the bristle part respectively. The bristle insert shapes the bristle bundle into the required bristle shape, such as a cylinder.

[0021] S4: The hard plastic brush handle with implanted bristle bundles and the bristle implanting component are placed together with the bristle implanting insert in the overmolding mold and soft plastic is injected. The soft plastic covers one end surface of the hard plastic brush handle and wraps the bristle implanting part and the bristle implanting component to form a soft plastic overmolding layer. The soft plastic overmolding layer covers one end of the hard plastic brush handle so that the outer surface of the use end of the brush head forms a middle bristle implanting area and an edge bristle implanting area. The bristle implanting part is located in the middle bristle implanting area, and the bristle implanting component is located in the edge bristle implanting area. S5: The hard rubber brush handle wrapped with a soft rubber coating is sequentially removed from the coating mold and the bristle insert to obtain the electric toothbrush head.

[0022] The electric toothbrush head prepared by the method of this invention has an integrally formed bristle implantation part on one end of the hard rubber handle, located in the middle bristle implantation area of ​​the brush head's use end. This part can directly transmit the high-frequency vibration of the motor to ensure the brushing force of the core cleaning area and guarantee the cleaning power of the teeth. The bristle implantation parts, which are set independently of the hard rubber handle, are distributed in the edge bristle implantation area of ​​the brush head's use end. They are completely wrapped by a soft rubber coating layer to form a flexible buffer structure. Since they are set independently and are not integrally formed with the hard rubber handle, the vibration transmitted from the hard rubber handle to the bristle implantation parts is greatly reduced. This reduces the vibration intensity of the edge bristles to avoid discomfort and damage to the gums and oral cavity. At the same time, the elastic deformation of the soft rubber increases the bristle swing amplitude, thereby improving the fluid cleaning force. This achieves a functional balance between efficient cleaning in the middle bristle implantation area and comfortable gum care in the edge bristle implantation area, making the brush head less likely to damage the oral cavity and gums during use and improving the comfort of use.

[0023] Furthermore, traditional ultrasonic welding processes for fixing brush bundles can cause the plastic material of the brush head to become brittle, making the brush head prone to breakage and injury. Ultrasonic welding also has a high defect rate, increases costs, and generates welding fumes, polluting the environment. The preparation method of this invention uses a non-contact welding process to fix the brush bundles within the pores during brush head preparation, thus avoiding the problems of ultrasonic welding. In the step of implanting the brush bundles, the non-contact welding process can be infrared welding, laser welding, induction welding, or microwave welding, etc.

[0024] Specifically, in the preparation method of the present invention, step S1 uses thermoplastic hard plastic material to form a hard plastic brush handle and multiple bristle implants through injection molding. One end of the hard plastic brush handle is integrally formed with multiple bristle implants, which are rigidly connected to the hard plastic brush handle to form the basic support structure of the middle bristle implant area. Each bristle implant is formed as a discrete functional unit independently of the hard plastic brush handle. Through this split molding method, the pre-set functional partition architecture of the brush head is completed in the hard plastic stage, laying the structural foundation for the subsequent realization of differentiated mechanical properties.

[0025] In step S2, the hard rubber brush handle and its integrally formed bristle-planting part, along with multiple independently formed bristle-planting parts, are placed together in the bristle-planting insert of the bristle-planting equipment for positioning and fixation. The bristle-planting parts are arranged in a ring array around all the bristle-planting parts to ensure the positional accuracy of the middle bristle-planting area and the edge bristle-planting area. At the same time, the bristle-planting insert becomes a process carrier connecting the subsequent bristle-planting process and the overmolding process.

[0026] In step S3, the bristle bundles are implanted into the pores of the bristle implantation part and the bristle implantation component using a bristle implantation device. Then, the bottom of the bristle bundles is heated non-contactly by radiation to melt them into a mushroom-shaped melt. The mushroom-shaped melt is then pressed into the corresponding pore. The inverted structure formed by the mushroom head diameter being larger than the pore diameter and the shrinkage of the cooled material are used to achieve anchorless mechanical locking of the bristle bundles. This allows for the simultaneous implantation and fixing of the middle and edge areas in the same process, eliminating the risk of rusting caused by metal anchors in the prior art and ensuring the consistency of the bristle shape.

[0027] In step S4, the hard plastic brush handle with implanted bristle bundles and the bristle implant are placed together with the bristle implant insert in the overmolding mold. The soft plastic overmolding layer is formed by injection molding thermoplastic elastomer material to cover one end surface of the hard plastic brush handle and completely encapsulate the bristle implant and the bristle implant. This overmolding layer forms a functional partitioned middle bristle implant area and an edge bristle implant area on the outer surface of the hard plastic brush handle of the brush head. The bristle implant is located in the middle bristle implant area to provide rigid support, and the bristle implant is located in the edge bristle implant area and is wrapped in soft plastic to provide gingival protection and cushioning, thereby achieving the integration of the hard plastic skeleton and the soft plastic gingival protection function.

[0028] Specifically, the bristle implantation equipment can be a PTT bristle implantation device, which is an anchorless toothbrush manufacturing device. Its core lies in using three parameters—pressure, temperature, and time—to achieve copper-wire-free fixation of the bristle bundles. The overmolding mold is a TPE overmolding mold, which can achieve composite molding of soft and hard plastics. In the manufacturing of electric toothbrush heads, an insert molding process is used to inject TPE soft plastic into the hard plastic skeleton that has already undergone PTT bristle implantation as an insert to form an integrated brush head structure.

[0029] In step S5, the hard rubber handle, wrapped with a soft rubber coating, is sequentially removed from the coating mold and the bristle insert to obtain a finished electric toothbrush head with a central hard support area and a soft gum-protecting edge area. Radiant heating can be used to melt the bottom of the bristle bundles, and the mold and bristles do not have direct contact, avoiding contamination and inconsistent shapes.

[0030] Specifically, after the step of implanting the bristle bundles and before the step of injection molding the soft rubber, the process includes a step of heat-compression treatment on the opening of the pores, causing the hard rubber material of the hard rubber brush handle to shrink and cover the neck of the mushroom-shaped molten body, forming a mechanical locking structure after cooling. This step, performed after the bristle bundles are implanted into the pores and before injection molding the soft rubber, softens the hard rubber material under heat and causes it to radially shrink and cover the neck of the mushroom-shaped molten body under pressure, forming a mechanical locking structure after cooling. This treatment strengthens the bristle bundle retention force through a dual fixing mechanism of mushroom head interference fit and neck locking, resisting the thermomechanical impact of subsequent overmolding processes in a pre-locked state. Simultaneously, it transforms the pore openings into inverted anchor points to enhance the three-dimensional mechanical interlocking of the hard and soft rubber interfaces, and improves the process redundancy to material fluctuations and working condition strains. Ultimately, it realizes the transformation of the hard rubber skeleton from a passive carrier to an active functional component, ensuring the structural reliability of the brush head under high-frequency vibration conditions.

[0031] Specifically, the hot compression process employs a hot-press shrinking technique, which involves using a continuously heated metal pressure head (hot melt head) to directly contact the pore opening. Through heat conduction, the hard plastic material is softened, while axial pressure is applied to make the material flow towards the center and cover the mushroom head neck. Subsequently, the pressure is maintained for cooling and shaping. Alternatively, a pulse hot-press shrinking technique can be used, which employs an integrated pressure head that combines pulsed current heating and compressed air cooling. Precise temperature control is achieved through a cycle of "heating-holding pressure-cooling-reheating demolding".

[0032] Furthermore, after the heat-compression treatment step and before the injection molding step, a step is included: punching away the connecting filaments between adjacent bristle implants. In the injection molding step, the tops of the bristle implants and the bristle portions protrude beyond the soft rubber coating layer. By ensuring the tops of the bristle implants and the bristle portions protrude beyond the soft rubber coating layer, the exposure of the bristle bundles is ensured, avoiding insufficient effective bristle height and reduced cleaning power caused by an excessively thick soft rubber coating layer. This allows the high-frequency vibrations in the central bristle area to be transmitted to the teeth without loss, achieving deep cleaning.

[0033] In the step of injection molding the hard rubber brush handle, a protrusion is formed on one end of the hard rubber brush handle facing away from the bristle-forming part; in the step of injection molding the soft rubber, the soft rubber overlay layer covers the protrusion. The protrusion increases the engagement and connection area between the hard rubber brush handle and the soft rubber overlay layer, allowing the soft rubber overlay layer to more firmly wrap around the hard rubber brush handle.

[0034] In the injection molding process of the hard rubber brush handle and multiple bristle implants, the pores of both the bristle implants and the bristle-implanted parts are blind holes. By designing the pores of both the bristle implants and the bristle-implanted parts as blind holes, the sealing optimization and hygienic performance of the bristle bundle fixing structure are significantly improved. The closed bottom structure of the blind holes allows the mushroom-shaped melt at the bottom of the bristle bundle to be completely embedded in the bottom of the hole during processing. Combined with the mechanical locking formed by the hot compression port, the bristle bundle and the pore are sealed and fixed in an integrated manner, avoiding the problems of dirt accumulation and bacterial growth caused by exposed bristle roots or through gaps in traditional through-hole structures. At the same time, the blind hole design eliminates the need to consider sealing the bottom of the holes when the soft rubber overlay layer wraps the bristle implants and the bristle-implanted parts, simplifying the structure and process control of the overlay mold.

[0035] In the injection molding of the soft rubber, a gap exists between the bristle implant and one end of the hard rubber brush handle, ensuring that the bristle implant does not contact the hard rubber brush handle. The soft rubber overlay fills this gap. By creating a gap between the bristle implant and the hard rubber brush handle and filling it with the soft rubber overlay, the flexible cushioning effect of the soft rubber overlay on the bristle implant is further enhanced. The gap also completely isolates the bristle implant from the hard rubber brush handle, preventing direct transmission of vibration caused by rigid contact. After filling, the soft rubber overlay forms a continuous elastic support structure, ensuring that the bristle implant can still generate moderate oscillation under motor drive to maintain its cleaning function, while significantly reducing the vibration intensity of the edge bristles. This better protects the gums and teeth from high-frequency impact damage. Simultaneously, the elastic deformation of the soft rubber increases the bristle oscillation amplitude to enhance fluid cleaning power, ultimately achieving a better balance between powerful cleaning in the central area and comfortable gum care in the edge area.

[0036] The present invention also discloses an electric toothbrush head, which is prepared by the above-described preparation method.

[0037] Specifically, such as Figures 1 to 8 As shown, the electric toothbrush head includes a hard plastic handle 1, a bristle implant 2, bristle bundles 3, and a soft plastic coating layer 4. The soft plastic coating layer 4 covers one end of the hard plastic handle 1 to form a central bristle implantation area 5 and an edge bristle implantation area 6 on the outer surface of the user end 8 of the brush head. A bristle implantation part 111 is integrally formed with the hard plastic handle 1 at one end. The bristle implantation part 111 is located in the central bristle implantation area 5, and the bristle implant 2 is located in the edge bristle implantation area 6 and is set independently of the hard plastic handle 1. The soft plastic coating layer 4 wraps around the bristle implantation part 111 and the bristle implant 2. The bristle bundles 3 are fixed in the pores 7 of both the bristle implantation part 111 and the bristle implant 2.

[0038] The bristle implantation part 111, integrally formed on one end of the hard rubber brush handle 1 of this invention, is located in the central bristle implantation area 5. It can directly transmit the high-frequency vibration of the motor to ensure the brushing force of the core cleaning area and guarantee the cleaning power of the teeth. The bristle implantation component 2, which is set independently of the hard rubber brush handle 1, is distributed in the edge bristle implantation area 6. It is completely wrapped by the soft rubber coating layer 4 to form a flexible buffer structure. Since it is set independently and not integrally formed with the hard rubber brush handle 1, the vibration transmitted from the hard rubber brush handle 1 to the bristle implantation component 2 is greatly reduced. This reduces the vibration intensity of the edge bristles to avoid discomfort and damage to the gums and oral cavity. At the same time, the elastic deformation of the soft rubber increases the bristle swing amplitude, thereby improving the fluid cleaning force. This achieves a functional balance between the efficient cleaning of the central bristle implantation area 5 and the comfortable gum protection of the edge bristle implantation area 6. This makes it less likely to damage the oral cavity and gums when using the brush head, thus improving the comfort of use.

[0039] Specifically, during use, the middle bristle area 5 of the brush head's use end 8 usually rests against the teeth, and the middle bristle area 5 is less likely to touch the gums or mouth, while the edge bristle area 6 is more likely to touch the gums or mouth. Therefore, the lower vibration intensity of the bristles on the edge bristle area 6 can improve the comfort of using the brush head, while the bristle bundles 3 in the middle bristle area 5 can ensure the cleaning effect on the teeth.

[0040] Specifically, a gap exists between the bristle implant 2 and the user end 8, ensuring that the bristle implant 2 does not contact the user end 8, and the soft rubber coating layer 4 fills the gap. By creating a gap between the bristle implant 2 and the user end 8 of the hard rubber brush handle 1, and filling it with the soft rubber coating layer 4, the flexible buffering effect of the soft rubber coating layer 4 on the bristle implant 2 is further enhanced. The gap also completely isolates the bristle implant 2 from the hard rubber brush handle 1, avoiding direct transmission of vibration caused by rigid contact. After filling, the soft rubber coating layer 4 forms a continuous elastic support structure, ensuring that the bristle implant 2 can still generate moderate oscillation under motor drive to maintain its cleaning function, while significantly reducing the vibration intensity of the edge bristles. This better protects the gums and teeth from high-frequency impact damage. Simultaneously, the elastic deformation of the soft rubber can increase the bristle oscillation amplitude to enhance fluid cleaning power, ultimately achieving a better balance between powerful cleaning in the central area and comfortable gum care in the edge area.

[0041] Furthermore, there are multiple bristle implants 2, which are arranged around the central bristle implantation area 5. By arranging multiple bristle implants 2 around the central bristle implantation area 5, the bristle implants 2 form a 360-degree circumferential coverage. The central bristle implantation area 5 maintains a rigid connection with the hard rubber handle 1 to ensure the core cleaning power of the brush head. The independently distributed bristle implants 2, through gaps and cooperation with the soft rubber coating layer 4, form a continuous flexible protective band around the entire outer circumference of the brush head. Regardless of the user's brushing angle, the bristles in the edge bristle implantation area 6 can conform to the tooth contour and gum curve with low-intensity vibration. This avoids discomfort and damage caused by strong vibrations of the bristle bundles 3 directly impacting oral tissues, and the circumferential soft rubber elastic support increases the overall swing amplitude to improve the fluid cleaning effect, achieving a comprehensive balance between cleaning power and comfort.

[0042] The tops of the bristle implant 2 and the bristle implant 111 protrude from the soft rubber coating layer 4. By making the tops of the bristle implant 2 and the bristle implant 111 protrude from the soft rubber coating layer 4, the exposure of the bristle bundles 3 is ensured, avoiding the problems of insufficient effective bristle height and reduced cleaning power caused by an excessively thick soft rubber coating layer 4. This allows the high-frequency vibration of the middle bristle implant area 5 to be transmitted to the teeth without loss, achieving deep cleaning.

[0043] The cross-sectional shape of the pores 7 of the hair implantation component 2 and the hair implantation part 111 is circular, elliptical, rhomboid, or triangular. The cross-sectional shape of the bristle bundle 3 is adapted to the shape of the pores 7 of the hair implantation component 2 and the hair implantation part 111. The bristle bundle 3 is composed of multiple bristles forming a bundle. During hair implantation, the ends of the bristle bundle 3 are fused into the pores 7, and the bristles fill the pores 7, so that the shape of the bristle bundle 3 is consistent with the shape of the pores 7.

[0044] The hard rubber brush handle 1 has a protrusion 112 on the side opposite to the bristle-forming part 111, and the soft rubber coating layer 4 covers the protrusion 112. The protrusion 112 increases the engagement and connection area between the hard rubber brush handle 1 and the soft rubber coating layer 4, allowing the soft rubber coating layer 4 to be more firmly wrapped around the hard rubber brush handle 1.

[0045] Both the bristle implant 2 and the bristle implantation section 111 have blind holes 7. By designing the bristle implant 2 and the bristle implantation section 111 to have blind holes, the sealing optimization and hygienic performance of the bristle bundle 3 fixing structure are significantly improved. The closed bottom structure of the blind hole allows the mushroom head melt at the bottom of the bristle bundle 3 to be completely embedded in the bottom of the hole during processing. Combined with the mechanical locking formed by the heat compression port, the bristle bundle 3 and the bristle hole 7 are sealed and fixed in an integrated manner, avoiding the problems of dirt and bacteria accumulation caused by the exposed or through gaps at the root of the bristle bundle 3 in the traditional through-hole structure. At the same time, the blind hole design means that the soft rubber coating layer 4 does not need to consider the sealing of the bottom of the hole when wrapping the bristle implant 2 and the bristle implantation section 111, simplifying the structure and process control of the coating mold.

[0046] The surface of the bristle-embedded part 111 on the hard rubber brush handle 1 is recessed to form a recessed platform 113. The recessed platform 113 on the surface of the bristle-embedded part 111 on the hard rubber brush handle 1 reduces the overall thickness of the brush head, which is beneficial for the miniaturization of the brush head and improves the comfort of use.

[0047] The hard rubber brush handle 1 is made of ABS or PP material, the bristle attachment 2 is made of plastic material, the bristle bundle 3 is made of PA612 or PBT material, and the soft rubber overlay layer 4 is made of TPE or TPU material. Specifically, the hard rubber brush handle 1 is made of ABS or PP material, where ABS has good mechanical strength, dimensional stability, and surface gloss, while PP has excellent chemical corrosion resistance. Both can provide sufficient rigid support for the brush head to transmit high-frequency vibrations from the motor. The bristle attachment 2 is made of plastic material, similar to or compatible with the material of the hard rubber brush handle 1, ensuring a stable interface between the hard and soft rubber under the soft rubber overlay layer 4. The bristle bundle 3 is made of PA612 or PBT material. PA612 has excellent abrasion resistance, resilience and low water absorption, making it suitable for long-term high-frequency vibration use. PBT is lower in cost and has good rigidity. Both can be melted to form a reliable mushroom head fixing structure. The soft rubber coating layer 4 is made of TPE or TPU material. TPE has excellent elastic recovery and processing fluidity, making it easy to fill gaps and wrap complex structures. TPU has higher abrasion resistance and mechanical strength. Together, they provide flexible buffer and shock absorption protection for the edge area. The entire material system, through the synergistic cooperation of rigid substrate, elastic coating and functional bristles, significantly improves the comfort and safety of use while ensuring cleaning effect.

[0048] PA612 is a high-performance polyamide material, formed by the condensation polymerization of hexamethylenediamine and dodecanoic acid, and is a common nylon material. PBT is short for polybutylene terephthalate, a thermoplastic polyester material formed by the condensation polymerization of terephthalic acid and 1,4-butanediol. As a brush bristle material, PBT has high rigidity and strength, and can provide good upright support at a relatively low cost.

[0049] During processing, the soft rubber coating layer 4 wraps the hard rubber brush handle 1, the bristle implantation part 111, and the bristle implantation component 2 through injection molding. The bristle bundles 3 are fixed to the bristle implantation part 111 and the bristle implantation component 2 by conventional hot-melt welding and pressing into the corresponding bristle holes 7 at the bottom, such as non-contact welding processes known to those skilled in the art: infrared welding, laser welding, induction welding, microwave welding, etc., which will not be described in detail here.

[0050] The present invention also discloses an electric toothbrush, including the aforementioned electric toothbrush head and main body. A motor is disposed inside the main body, and the output shaft of the motor extends out from one end of the main body. The end of the brush head away from the user end 8 is inserted into the output shaft, thereby enabling the vibration of the motor to be transmitted to the brush head, which will not be described in detail here.

[0051] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Those skilled in the art can modify the technical solutions described in the above embodiments, or make equivalent substitutions for some of the technical features; and all such modifications and substitutions should fall within the protection scope of the appended claims of the present invention.

Claims

1. A method for preparing an electric toothbrush head, characterized in that, Including the following steps: Injection-molded hard plastic brush handle and multiple bristle implants, wherein multiple bristle implants are integrally formed on one end of the hard plastic brush handle, and the bristle implants are formed independently of the hard plastic brush handle. The hard rubber brush handle and the hair implantation component are positioned and fixed in the hair implantation clamp of the hair implantation equipment, wherein a plurality of the hair implantation components are arranged around all the hair implantation parts. The bristle insert is shaped according to the bristle bundle shape, and the bottom of the bristle bundle is non-contactly fused and heated to form a mushroom head-shaped molten body at the bottom of each bristle bundle; then the mushroom head-shaped molten body is implanted into the corresponding pores of the bristle insert and the bristle part respectively. The hard plastic brush handle with implanted bristle bundles and the bristle implanting component are placed together with the bristle implanting insert in a plastic encapsulation mold and soft plastic is injected. The soft plastic covers one end surface of the hard plastic brush handle and wraps the bristle implanting part and the bristle implanting component to form a soft plastic encapsulation layer. The soft plastic encapsulation layer covers one end of the hard plastic brush handle so that the outer surface of the user end of the brush head forms a central bristle implanting area and an edge bristle implanting area. The bristle implanting part is located in the central bristle implanting area, and the bristle implanting component is located in the edge bristle implanting area. The hard rubber brush handle, wrapped with a soft rubber coating, is sequentially removed from the coating mold and the bristle insert to obtain the electric toothbrush head.

2. The preparation method according to claim 1, characterized in that, The step following the implantation of the bristle bundles and before the injection molding of the soft gel includes the following step: The opening of the pore is subjected to heat compression treatment, which causes the hard rubber material of the hard rubber brush handle to shrink and cover the neck of the mushroom-shaped molten body, forming a mechanical locking structure after cooling.

3. The preparation method according to claim 2, characterized in that, After the heat compression port treatment step and before the injection molding of soft rubber step, the following step is also included: The connecting adhesive threads between adjacent flocking components are removed by punching.

4. The preparation method according to any one of claims 1 to 3, characterized in that, In the injection molding of the soft rubber, the top of the tufted part and the tufted portion protrudes from the soft rubber overlay layer.

5. The preparation method according to any one of claims 1 to 3, characterized in that, In the step of injection molding the hard rubber brush handle, a protrusion is formed on one end of the hard rubber brush handle facing away from the bristle-forming part; in the step of injection molding the soft rubber, the soft rubber overlay layer covers the protrusion.

6. The preparation method according to any one of claims 1 to 3, characterized in that, In the step of injection molding the hard rubber brush handle and multiple bristle implants, the pores of the bristle implants and the bristle implants are all blind holes.

7. The preparation method according to any one of claims 1 to 3, characterized in that, In the injection molding of the soft rubber, there is a gap between the bristle implant and one end of the hard rubber brush handle, so that the bristle implant does not contact the hard rubber brush handle, and the soft rubber overlay layer fills the gap.

8. The preparation method according to any one of claims 1 to 3, characterized in that, In the step of implanting the bristle bundle, the non-contact welding process is infrared welding, laser welding, induction welding, or microwave welding.

9. An electric toothbrush head, characterized in that, Prepared by the preparation method according to any one of claims 1 to 8.

10. An electric toothbrush, characterized in that, Includes the electric toothbrush head as described in claim 9.

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