Toothbrush with bent bristles and preparation method thereof

Abstract

The invention discloses a toothbrush with bent bristles and a preparation method thereof.The toothbrush comprises a brush handle and a brush head, the brush head is connected to one end of the brush handle, and a plurality of bristle bundles are arranged on the brush head; the bristles in the bristle bundle are divided into two sides, and the tops of the bristles on the two sides are bent towards the middle to form a bent structure gathering towards the middle. Therefore, the bristles on the two sides of the bristle bundle are bent towards the middle to form a gathering structure, the fitting degree of tooth slits, gingival sulcus and other parts is enhanced, the cleaning efficiency is improved, dirt and bacterial residues are reduced, the bending angle of 30-60 degrees and soft and elastic materials are matched, the cleaning effect is guaranteed, gingival stimulation damage is reduced, and the toothbrush is particularly suitable for crowds sensitive to gingiva.

Description

Technical Field

[0001] The present application relates to the technical field of daily necessities, and in particular to a toothbrush with bent bristles and a preparation method thereof. Background Art

[0002] Currently, there are many types of toothbrushes on the market, but the bristle structure of most toothbrushes is relatively traditional.

[0003] Ordinary bristles are mostly straight, and even if some toothbrushes use a simple bristle bending design, it is difficult to fully adapt to the complex shape of the tooth surface. In the daily brushing process, the gaps between teeth, gingival sulci and other parts of the teeth are the focus and difficulty of cleaning.

[0004] Straight bristles are difficult to fit closely to these areas, resulting in incomplete cleaning, which easily leaves food residues and bacteria, and may cause oral problems such as caries and gingivitis in the long run. In addition, improper bristle design may cause excessive stimulation to the gums when brushing teeth, damaging gum health. Therefore, there is an urgent need for a toothbrush design that can better fit teeth, improve cleaning efficiency and protect gums. Summary of the invention

[0005] The present application aims to solve one of the technical problems in the related art at least to some extent.

[0006] To this end, the first purpose of the present application is to provide a toothbrush with bent bristles and a method for preparing the same. By bending the two sides of the bristles in the bristle bundle toward the middle to form a gathering structure, the fit to hard-to-clean areas such as the gaps between teeth and gingival sulci can be significantly enhanced, thereby effectively improving the cleaning efficiency, reducing the residue of oral dirt and bacteria, and reducing the risk of oral diseases.

[0007] The second purpose of the present application is to provide a toothbrush with bent bristles and a method for preparing the same. The bristles are made of soft and elastic material and have a reasonable bending angle (30° to 60°). While ensuring the cleaning effect, they can reduce irritation and damage to the gums and achieve effective protection of the gums. The toothbrush is particularly suitable for people with sensitive gums.

[0008] The third object of the present application is to provide a toothbrush with bent bristles and a method for preparing the same, wherein the bent bristles on both sides directly act on the teeth, thereby avoiding tooth root wear caused by improper brushing methods (brushing back and forth).

[0009] To achieve the above-mentioned purpose, the first aspect embodiment of the present application proposes a toothbrush with bent bristles and a preparation method thereof, comprising a brush handle and a brush head, wherein the brush head is connected to one end of the brush handle, and a plurality of bristle bundles are arranged on the brush head; the bristles in the bristle bundles are divided into two sides, and the tops of the bristles on both sides are bent toward the middle respectively, forming a bent structure gathered toward the middle.

[0010] The embodiments of the present application provide a toothbrush with bent bristles and a method for preparing the same, wherein the bristles on both sides of the bristle bundle are bent toward the middle to form a gathering structure, thereby enhancing the fit to the gaps between teeth, gingival sulcus and other parts, improving the cleaning efficiency, and reducing residual dirt and bacteria. With a bending angle of 30°-60° and soft elastic material, it not only ensures the cleaning effect, but also reduces irritation and damage to the gums, and is especially suitable for people with sensitive gums.

[0011] In addition, the toothbrush with bent bristles and the preparation method thereof proposed in the present application may also have the following additional technical features:

[0012] In one embodiment of the present application, the bending angle of the top of the bristle is 30° to 60°.

[0013] In one embodiment of the present application, the bristles are made of a soft and elastic material.

[0014] In one embodiment of the present application, the surface of the brush handle is provided with an anti-slip texture, and the shape of the brush handle conforms to the ergonomic design and is easy to hold.

[0015] In one embodiment of the present application, the method is a pre-bending and post-implantation method, comprising the following steps:

[0016] S1: pre-bend bristle monofilaments with a diameter of 0.08-0.15 mm at a predetermined angle of 30°-60° to form bristle tufts with both sides gathered toward the middle;

[0017] S2: The pre-bent hair tufts are implanted into the hair implantation holes of the brush head by a high-speed hair implantation machine, and each tuft contains 30-50 monofilaments;

[0018] S3: The implanted brush head is fixed with resin and the bristle tip is rounded to make the roundness of the bristle tip reach R0.01mm level.

[0019] In one embodiment of the present application, the method is a normal post-implantation thermal bending method, comprising the following steps:

[0020] S1: Unbent bristle monofilaments are implanted into the implantation holes of the brush head in a concentric circle structure, with a monofilament diameter of 0.15-0.18 mm and 36-48 strands per cluster;

[0021] S2: Place the implanted brush head in a heating device at 135°C-145°C, and heat the 10-15 mm section at the top of the bristles for 30-60 seconds;

[0022] S3: Use a precision mold with a V-groove to apply lateral pressure to the heated bristles, so that the bristles on both sides bend toward the middle to form an angle of 30°-60°;

[0023] S4: Cooling at room temperature for 1-2 minutes to allow the bristles to be shaped and restore the elastic modulus to 500-800 MPa. In one embodiment of the present application, the method is a mold bending molding method, comprising the following steps:

[0024] S1: preparing a forming die with a predetermined bending angle (30°-60°), wherein the die comprises symmetrical double-sided extrusion blocks, and the extrusion surface angle is consistent with the target bending angle;

[0025] S2: placing the unbent bristle monofilament into the mold cavity, and directly forming the bristle tips into a structure gathered toward the middle in the mold through injection molding or hot pressing process;

[0026] S3: implanting the formed bristle bundle into the brush head and fixing the implanted bristle area by ultrasonic welding;

[0027] S4: The brush head is subjected to surface antibacterial treatment to form a silver ion coating with a thickness of 5-10 μm.

[0028] The advantages of this application compared with the existing technology are:

[0029] (1) By bending the two sides of the bristles in the bristle bundle toward the middle to form a gathering structure, the adhesion to hard-to-clean areas such as the gaps between teeth and gingival sulci can be significantly enhanced, the cleaning efficiency can be effectively improved, the residue of oral dirt and bacteria can be reduced, and the risk of oral diseases can be reduced.

[0030] (2) The bristles are made of soft and elastic material, with a reasonable bending angle (30° to 60°). While ensuring the cleaning effect, it can reduce irritation and damage to the gums and achieve effective protection for the gums. It is especially suitable for people with sensitive gums.

[0031] (3) The curved bristles on both sides act directly on the teeth, which can prevent tooth root wear caused by improper brushing methods (brushing back and forth).

[0032] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0034] Figure 1 A three-dimensional diagram of a toothbrush with bent bristles and a method for preparing the same according to an embodiment of the present application;

[0035] Figure 2 is a stereoscopic diagram of a toothbrush with bent bristles and a method for preparing the same according to another embodiment of the present application;

[0036] Figure 3 is a three-dimensional diagram of a toothbrush with bent bristles and a method for preparing the same according to another embodiment of the present application;

[0037] Figure 4 A schematic diagram of a toothbrush with bent bristles and a method for preparing the same according to an embodiment of the present application, wherein the bristles are pre-bent and then implanted;

[0038] Figure 5 A schematic diagram of a normal post-implantation hot bending method of a toothbrush with bent bristles and a preparation method thereof according to an embodiment of the present application;

[0039] Figure 6 It is a schematic diagram of a mold bending forming method of a toothbrush with bent bristles and a preparation method thereof according to an embodiment of the present application.

[0040] As shown in the figure: 1. Brush handle; 2. Brush head; 3. Bristle bundle. DETAILED DESCRIPTION

[0041] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limitations on the present application. On the contrary, the embodiments of the present application include all changes, modifications and equivalents that fall within the spirit and connotation of the appended claims.

[0042] A toothbrush with bent bristles and a method for making the same are described below in conjunction with the accompanying drawings.

[0043] like Figure 1-Figure 6 As shown, a toothbrush with bent bristles and a preparation method thereof according to an embodiment of the present application may include a brush handle 1 and a brush head 2, wherein the brush head 2 is connected to one end of the brush handle 1, and a plurality of bristle bundles 3 are arranged on the brush head 2, and the bristles in the bristle bundles 3 are divided into two sides, and the tops of the bristles on both sides are bent toward the middle respectively, forming a bent structure gathered toward the middle.

[0044] It is understandable that the bent bristle toothbrush of this embodiment is composed of a brush handle 1 and a brush head 2 as a basic component. The brush head 2 is fixedly connected to the front end of the brush handle 1 through an injection molding process, and the two constitute the main frame of the toothbrush. On the bristle implantation surface of the brush head 2, a plurality of independent bristle bundles 3 are implanted in a matrix arrangement, and each bristle bundle 3 contains 30-50 nylon monofilaments with a diameter of 0.15-0.18 mm.

[0045] In a specific implementation, the hair tufts of each bristle bundle 3 are subjected to a directional bending process after hair planting: a single bristle bundle is divided into two symmetrical left and right tufts along its axis plane, with the top of the left tuft tilted to the right, and the top of the right tuft tilted symmetrically to the left, forming a bidirectionally gathered V-shaped bending structure. The intersection of the bending structure is located 2-3 mm from the top of the bristle, so that the hair tips on both sides form a concentrated contact area.

[0046] The working process is as follows: when the user holds the brush handle 1 and applies force to brush their teeth, the brush head 2 drives each bristle bundle 3 to contact the tooth surface. The bristles bent on both sides produce cooperative deformation under the action of pressure, and further converge toward the center line, so that the contact area of ​​the bristle tips is reduced by 40%-50%, forming a wedging effect on the tooth gap. In the horizontal brushing action, the gathered bristle tips can penetrate into the tooth gap to a depth of 1.0-1.5mm, and remove residues through mechanical friction. After the external force is removed, the bristle bundle 3 relies on the material memory characteristics to restore the initial bending state, ensuring that the dynamic cleaning process can be repeated every time the brushing action is performed. This structural feature enables the bristles to significantly enhance the directional cleaning ability of the adjacent surfaces of the teeth while maintaining the conventional cleaning function.

[0047] In one embodiment of the present application, Figure 1-Figure 6 As shown, the bending angle of the top of the bristle is 30° to 60°.

[0048] It is understandable that in this embodiment, the bending angle of the top of the bristle bundle 3 is controlled to be 30° to 60° by a precision hot pressing mold. In specific implementation, after the bristle bundle 3 is implanted, a double-sided heating plate is used to shape the single bristle bundle: the unbent vertical bristle bundle 3 is clamped in a mold with a V-shaped groove, and the heating plates on both sides of the mold heat the 10-15mm section of the top of the bristle at a temperature of 135℃-145℃, and the top of the bristle is extruded by the mold to form a precise bending angle.

[0049] The bending angle of 30° to 60° is defined as the angle formed by the bristles on one side and the original vertical axis. In implementation:

[0050] When the bend is set at 30°, the intersection of the bristle tips on both sides of the bristle bundle 3 is 8-10 mm away from the implant pore plane, forming a relatively gentle V-shaped structure, which is suitable for wide-area cleaning of the crown surface.

[0051] When set to a 60° bend, the intersection point is raised to 4-6mm from the implant pore plane, forming a steep angle specifically for deep cleaning of the gingival sulcus.

[0052] The specific working process is as follows: During the brushing pressure stage, the 30° bending design of the bristle bundle 3 allows the bristle tip to slide into the tooth gap in a tangential direction, while the 60° bending design allows the bristle tip to act vertically on the gingival sulcus. Pressure test data show that when 200g of brushing pressure is applied, the top offset of the 30° bent bristles reaches 1.2-1.5mm, and the offset of the 60° bent bristles is controlled at 0.8-1.0mm. This angle range can ensure the transmission of cleaning force and buffer pressure through elastic deformation. After the external force is removed, the bristle bundle 3, relying on the material rebound characteristics, restores the bending angle to within ±2° of the initial value, ensuring the long-term effectiveness of the angle parameters.

[0053] In one embodiment of the present application, Figure 1-Figure 6 As shown, the bristles are made of soft and elastic material.

[0054] It is understood that in this embodiment, the bristle bundle 3 is made of modified polyester (PBT) monofilament with a diameter of 0.08-0.15mm, and its elastic modulus is controlled in the range of 500-800MPa, and the Shore hardness is A50-A55. In specific implementation, in the bristle bundle 3 implanting process, 36-48 monofilaments are implanted into the implanting holes of the brush head 2 in a concentric circle structure by a high-speed implanting machine, and then the surface is rounded to make the roundness of the bristle tip reach R0.01mm level.

[0055] The elastic properties of the material are achieved through the following process: two heat treatments are performed on the bristle bundle 3 after injection molding - the first preheating is maintained at 120℃±5℃ for 30 seconds to relax the molecular chains, and then the second heating is performed at 135℃±3℃ and rapid cooling during the bending and shaping stage to control the crystallinity of the material in the range of 28%-32%, thereby obtaining a rebound rate of 85%-92% (tested according to GB / T 9341 standard).

[0056] The specific working process is as follows: when the bristle bundle 3 contacts the tooth surface, the monofilament produces an elastic deformation of 0.5-1.2mm under pressure, and its stress-strain curve shows that the deformation reaches a peak value under a pressure of 200gf and then enters the plastic platform area. At this time, the bending stiffness of the bristle bundle 3 is maintained at 3.5-4.2N / mm 2 (Tested according to ISO 22254 standard), it can not only achieve the pressure transmission required for gingival sulcus cleaning, but also trigger the elastic deformation protection mechanism when the pressure exceeds 300gf. After the external force is removed, the bristle bundle 3 returns to its original shape within 0.3-0.8 seconds, and the deformation residual rate is ≤8% (tested according to ASTM D638 standard). This feature ensures that the bristle bundle 3 maintains a stable bending structure during continuous use.

[0057] In one embodiment of the present application, Figure 1-Figure 6As shown, the surface of the brush handle 1 is provided with an anti-slip texture, and the shape of the brush handle 1 conforms to the ergonomic design and is easy to hold.

[0058] It is understandable that in this embodiment, the brush handle 1 is manufactured by a double-material injection molding process, the main substrate is polypropylene (PP), and the surface is coated with a thermoplastic elastomer (TPE) anti-slip layer with a thickness of 1.2-1.8 mm. The anti-slip texture is formed by mold etching, which is specifically implemented as follows:

[0059] A diamond-shaped convex dot array is arranged on the surface of the holding area (length 80-100 mm) of the brush handle 1, with a single convex dot size of 0.8×0.8 mm, a height of 0.3 mm, and a distance between adjacent convex dots of 1.2 mm, forming a surface friction coefficient ≥ 0.65 (tested according to ASTM D1894 standard).

[0060] A wavy transverse groove is provided at 15 mm from the rear end of the brush handle 1, with a groove depth of 0.5 mm, a groove width of 1.0 mm, and a spacing of 2.0 mm to enhance the thumb positioning function.

[0061] In one embodiment of the present application, Figure 1-Figure 6 As shown, the method is a pre-bending and then implanting method, comprising the following steps:

[0062] S1: pre-bend bristle monofilaments with a diameter of 0.08-0.15 mm at a predetermined angle of 30°-60° to form bristle tufts with both sides gathered toward the middle;

[0063] S2: The pre-bent hair tufts are implanted into the hair implantation holes of the brush head 2 by a high-speed hair implantation machine, each tuft containing 30-50 monofilaments;

[0064] S3: The implanted brush head 2 is fixed with resin and the bristle tips are rounded to make the roundness of the bristle tips reach R0.01mm level.

[0065] It is understandable that the pre-bending of the bristle monofilament (step S1)

[0066] Modified polyester (PBT) monofilament with a diameter of 0.08-0.15 mm is selected as the bristle material, with an elastic modulus of 500-800 MPa and a Shore hardness of A50-A55. The initial state of the monofilament is vertical straight line with a length of 15-20 mm (the top 10 mm is the subsequent bending area).

[0067] Use a precision CNC bending mold (not shown), which contains symmetrical double-sided arc-shaped pressure plates with an inner angle of 30°-60°. The specific operation is as follows:

[0068] Arrange 20-30 monofilaments neatly in the V-shaped groove of the mold, with the roots of the monofilaments aligned with the mold reference surface;

[0069] Start the hydraulic device to close the double-sided pressing plates toward the center at a speed of 0.5 mm / s, and apply lateral pressure to the top of the monofilament until the top of the monofilament forms a bending angle consistent with the angle of the mold (that is, the angle between the bristles on one side and the vertical axis is 30°-60°);

[0070] Maintain the pressure for 10 seconds to allow the monofilament to take shape under the material memory effect, forming tufts of hair that gather toward the middle on both sides (the intersection point of the top of the tuft is 8-10mm away from the root, forming a gentle V-shaped structure, which is suitable for cleaning the surface of the crown).

[0071] Implanting the hair clusters into the hair implanting holes of the brush head (step S2)

[0072] The brush head 2 is injection molded of polypropylene (PP), and 50-80 hair planting holes (aperture 0.3-0.5mm, depth 2-3mm) are evenly distributed on the front hair planting surface, arranged in a matrix (row spacing 1.5mm, column spacing 1.2mm).

[0073] Use a high-speed hair transplanting machine model XYZ-800 (conventional equipment in this field), and the specific steps are as follows:

[0074] The pre-bent hair tufts (30-50 monofilaments per tuft, with neat roots) are clamped to the needles of the hair transplanting machine, and the distance between the needles matches the layout of the hair transplanting holes on the brush head;

[0075] The hair transplanting machine implants the hair tufts into the hair transplanting holes of the brush head 2 at a frequency of 2000 times / minute, with an implantation depth of 5-6mm (ensuring that the root of the monofilament is buried in 1 / 3 of the length of the brush head base);

[0076] After every 10 hair tufts are implanted, the hair implantation angle is calibrated through a visual inspection system to ensure that the bending directions of all hair tufts are consistent (all toward the central axis of the brush head).

[0077] Resin fixation and hair tip rounding (step S3)

[0078] After the hair transplantation is completed, inject 0.1-0.2mm into the bottom of each transplantation hole. 3 The epoxy resin adhesive (model: E-44) is cured in a constant temperature curing box (temperature 60°C, time 30 minutes) to form a mechanical locking structure for the roots of the bristles, ensuring that the bristle bundle 3 is not easy to fall off during use (pulling force ≥ 5N, in line with GB 30003-2013 standard).

[0079] Use precision grinding equipment (such as a rotary grinding head with a diameter of 0.2 mm and a speed of 5000 rpm) to chamfer the top of the bristles:

[0080] The grinding head moves along the circumferential direction of the bristle tip to remove sharp edges and corners, so that the bristle tip forms an arc with a radius of R0.01mm (the roundness is tested by an optical microscope);

[0081] After treatment, the diameter of the bristle tip is reduced to 0.06-0.12mm, which not only retains sufficient cleaning power but also avoids scratching the gums (clinical tests show that the pressure of the rounded bristles on the gums is ≤0.3N / mm 2 , significantly lower than the 0.8N / mm of traditional right-angle bristles 2 ).

[0082] In one embodiment of the present application, Figure 1-Figure 6 As shown, the method is a normal post-implantation heat bending method, comprising the following steps:

[0083] S1: implant unbent bristle monofilaments into the implantation holes of the brush head 2 in a concentric circle structure, with a monofilament diameter of 0.15-0.18 mm and 36-48 strands per cluster;

[0084] S2: placing the implanted brush head 2 in a heating device at 135°C-145°C, and heating the 10-15 mm section at the top of the bristles for 30-60 seconds;

[0085] S3: Use a precision mold with a V-groove to apply lateral pressure to the heated bristles, so that the bristles on both sides bend toward the middle to form an angle of 30°-60°;

[0086] S4: Cool at room temperature for 1-2 minutes to allow the bristles to set and restore the elastic modulus to 500-800 MPa.

[0087] It is understandable that implanting the unbent bristle monofilament (step S1)

[0088] Modified nylon 610 monofilament with a diameter of 0.15-0.18 mm and an elastic modulus of 600-750 MPa is selected. The initial state is vertical straight line and the length is 20-25 mm (the top 15 mm is the subsequent bending section).

[0089] The hair planting surface of brush head 2 is provided with hair planting holes with a diameter of 0.6mm, using the "concentric circle hair planting method":

[0090] Taking the center of the implantation hole as the origin, 36-48 monofilaments are divided into three layers of circular arrangement (8 in the inner layer, 16 in the middle layer, and 24 in the outer layer), and the angle between each layer of monofilament and the central axis is 15°-30°, forming a cylindrical hair cluster with dense bottom and scattered top;

[0091] Using a high-speed hair transplanting machine of model HT-500, the monofilament is implanted into the brush head 2 with a positioning accuracy of 0.1mm and an implantation depth of 8-10mm, ensuring that the root is buried more than 50% into the brush head base, and the pull-out force is ≥6N (in compliance with QB / T 1659-2014 standard).

[0092] Heating treatment of the bristle tips (step S2)

[0093] A customized double-sided infrared heating plate is used (the size of the heating area matches the bristle surface of the brush head). The temperature of the heating plate is set to 135°C-145°C (higher than the glass transition temperature of modified nylon 125°C and lower than the melting point 210°C). The specific process is as follows:

[0094] Fix the implanted brush head 2 to the fixture of the heating device so that the 10-15mm section of the top of the bristles is aligned with the gap of the heating plate (gap width 20mm);

[0095] Start the heating program, the double-sided heating plate radiates heating at a power of 200W / ㎡ for 30-60 seconds, and the temperature of the top of the bristles is monitored in real time through the thermocouple sensor (controlled at 140℃±5℃), so that the monofilament molecular chain segments are activated and have plasticity.

[0096] After heating, the elastic modulus of the bristle monofilament temporarily drops to 200-300MPa, and the bending stiffness decreases by 60%, which is convenient for subsequent mold bending; at the same time, it avoids the bristle from melting and sticking due to excessive temperature (the critical melting temperature is ≥180°C, and this process leaves enough safety margin).

[0097] The mold is pressed and bent into shape (step S3)

[0098] The precision mold consists of two symmetrical pressing plates, each with a V-shaped groove (groove depth 12mm, angle 30°-60°) processed inside. The mold is made of high-temperature resistant aluminum alloy (thermal conductivity 180W / (m·K)). Specific operations:

[0099] Place the heated brush head 2 horizontally on the mold base so that the bristle bundle 3 is aligned with the center of the V-shaped groove;

[0100] The servo motor is started to drive the upper pressing plate to press down at a uniform speed (speed 1mm / s). The two side walls of the V-shaped groove exert symmetrical lateral pressure on the top of the bristles, forcing the monofilaments on both sides to bend toward the central axis until the top touches the bottom of the V-shaped groove (forming the target angle);

[0101] The pressure sensor monitors the applied force in real time (controlled at 5-8N / cluster) to ensure that the bending angles of all bristle bundles in the same brush head are consistent (deviation ≤±2°).

[0102] After bending, the top of the single filament is 4-8mm away from the plane of the implant pore, and the bristles on both sides form a "V-shaped gathering structure". The distance between the intersection of the bristle tips is ≤0.5mm, which is suitable for deep cleaning of the gingival sulcus (can penetrate 1.5-2.0mm into the gingival sulcus).

[0103] Cooling, shaping and elastic recovery (step S4)

[0104] Keep the mold pressure and cool it naturally at room temperature of 25℃±2℃ for 1-2 minutes to make the bristle monofilament undergo the following changes:

[0105] The molecular chain segments recrystallize, the crystallinity increases from 20% after heating to 30%, and the elastic modulus gradually recovers to 500-800MPa;

[0106] The bending part is permanently shaped, and the bending angle retention rate is ≥95% (angle attenuation ≤3° after 1000 cycles of pressure testing) as tested by a three-coordinate measuring machine.

[0107] After cooling, the bristle bundle 3 has the characteristic of "elastic bending":

[0108] When brushing teeth, apply 200-300g of pressure, and the tip of the bristles can be elastically deflected 1.0-1.5mm to fit the curved surface of the teeth;

[0109] After the pressure is removed, the initial bending angle is restored by material rebound (rebound rate ≥ 85%) to avoid structural relaxation caused by long-term use.

[0110] In one embodiment of the present application, Figure 1-Figure 6 As shown, the method is a die bending forming method, comprising the following steps:

[0111] S1: preparing a forming die with a predetermined bending angle (30°-60°), the die comprising symmetrical double-sided extrusion blocks, and the extrusion surface angle is consistent with the target bending angle;

[0112] S2: placing the unbent bristle monofilament into the mold cavity, and directly forming the bristle tips into a structure gathered toward the middle in the mold through injection molding or hot pressing process;

[0113] S3: implanting the formed bristle bundle 3 into the brush head 2 and fixing the implanted bristle area by ultrasonic welding;

[0114] S4: performing antibacterial treatment on the surface of the brush head 2 to form a silver ion coating with a thickness of 5-10 μm.

[0115] It is understood that the preparation of the precision molding die (step S1)

[0116] The molding die is made of high-strength die steel (such as SKD11, hardness HRC58-62), and contains the following core components:

[0117] Double-sided extrusion block: symmetrical setting, the inner extrusion surface is an inclined surface, the angle α=30°-60° (consistent with the target bending angle), the extrusion surface roughness Ra≤0.8μm, to ensure the bristle forming accuracy;

[0118] Cavity positioning groove: located at the mold base, used to fix the hair planting surface of the brush head 2. The groove depth matches the thickness of the brush head (3-5mm), and the positioning accuracy is ±0.05mm;

[0119] Heating element: A resistance wire (power 50-100W) embedded in the extrusion block, which can control the extrusion surface temperature at 150℃-180℃ (to meet the requirements of injection molding / hot pressing process).

[0120] Use a three-coordinate measuring machine to test the extrusion surface angle to ensure that the deviation from the design value is ≤±1°;

[0121] During the no-load test run of the mold closing process, the pressure sensor shows that the closing pressure is 10-15N / mm 2 (Evenly act on the bristle monofilament).

[0122] Directly forming bristle bundles in the mold (step S2)

[0123] Brush bristle monofilament: Use modified polyester (PBT) monofilament (elastic modulus 550-700MPa) with a diameter of 0.12-0.16mm, a length of 25-30mm when not bent, and a 5mm bottom end reserved as a fixed section for implanting the brush head;

[0124] Arrangement: Place 40-50 monofilaments in parallel into the mold cavity, with the bottom of the monofilaments aligned with the mold positioning reference plane and the top extending to the angle area between the two-side extrusion blocks.

[0125] Injection molding process (suitable for integrated manufacturing)

[0126] Melt plasticization: Heat the polypropylene (PP) pellets to 230℃-250℃ and pass them through an injection molding machine at a speed of 50cm 3 / s injection speed into the mold cavity, wrapping the fixed section at the bottom end of the bristle;

[0127] Pressure maintenance: Maintain pressure at 100-150 bar for 10 seconds to ensure a firm bond between the plastic and the bristles;

[0128] Cooling and demoulding: The mold is cooled by water to below 50°C, and the semi-finished brush head with the formed bristle bundle 3 is taken out of the mold (at this time, the top of the bristle has been bent into an angle of 30°-60° by the extrusion block).

[0129] Hot pressing process (suitable for preparation of independent bristle bundles)

[0130] Preheating treatment: raise the temperature of the mold heating element to 160℃-170℃, and stabilize the extrusion surface temperature at 165℃±5℃;

[0131] Pressurization molding: Close the mold and apply 20-30N pressure to the 15mm section at the top of the bristle for 30 seconds. Use high temperature plasticity to bend and shape the monofilament (the crystallinity at the bend is increased to 35%, forming permanent deformation);

[0132] Demolding and cooling: Disconnect the heating power supply, cool naturally for 5 minutes, then open the mold and take out the formed clustered bristle bundles.

[0133] Implanting the brush head and ultrasonic welding (step S3)

[0134] The main body of the brush head 2 is made of polypropylene (PP) injection molding, and the hair planting surface is preset with 50-70 mounting holes (hole diameter 0.8-1.0mm, depth 10-12mm), and the hole spacing is 2.0mm×2.5mm (matrix distribution).

[0135] Robotic arm positioning: The brush head mounting hole is positioned through the visual recognition system, and the robotic arm clamps the formed bristle bundle 3 to ensure that the bristle gathering direction is consistent with the central axis of the brush head;

[0136] Implantation depth: insert the fixed section (5mm) at the bottom of the bristle into the mounting hole, with 15-20mm of the bent section exposed. Control the insertion force (5-8N) through the pressure sensor to avoid damaging the brush head.

[0137] Ultrasonic welding fixation: Use an ultrasonic welding machine with a frequency of 20kHz to apply welding pressure (10-15N) to the back of the brush head's bristle-planting surface for 0.3-0.5 seconds to melt and combine the bristle fixing section with the brush head material (pulling force ≥8N, better than the industry standard).

[0138] Antibacterial treatment of brush head surface (step S4)

[0139] A silver ion antibacterial layer with a thickness of 5-10 μm is deposited on the surface of the brush head 2 by magnetron sputtering method, and the specific steps are as follows:

[0140] Pretreatment: Place the brush head in an acetone solution for ultrasonic cleaning for 10 minutes to remove surface oil stains, and then place it into a vacuum sputtering chamber (vacuum degree ≤ 1×10-3Pa) after drying;

[0141] Sputtering deposition: Using a pure silver target (purity 99.99%) as the source, sputtering for 30 minutes at a bias voltage of 300V, so that the silver ions are evenly attached to the surface of the brush head and the gaps between the bristles;

[0142] Post-treatment: Aging treatment for 2 hours in a constant temperature box at 50℃ to enhance the adhesion of the coating (cross-cut test adhesion ≥ level 0).

[0143] The silver ion coating destroys the bacterial cell membrane through a contact sterilization mechanism, and the antibacterial rate against Escherichia coli and Staphylococcus aureus is ≥ 99% (tested according to GB / T 21866-2008 standard), and the coating can be washed ≥ 50 times (the antibacterial rate decays ≤ 5% after each washing).

[0144] Specific use process:

[0145] The user holds the anti-slip texture area of ​​the brush handle 1 and presses the wavy groove at the tail end with the thumb to position it. When the brush head 2 contacts the tooth surface, the V-shaped bending structure of the bristle bundle 3 produces the following synergistic effects:

[0146] 1. Front teeth cleaning stage: The curved part of the front section of the brush handle 1 is against the palm, and the force is applied at a 45° angle to the tooth surface. The tips of the bristle bundle 3 on both sides are further gathered under pressure, and slide into the tooth gap at a 30° bending angle. The elastic deformation of the single filament is 0.8-1.0mm, and the tips of the bristles penetrate 1.2mm into the tooth gap to remove residues.

[0147] 2. Post-molar cleaning stage: The groove at the end of the brush handle 1 forms a mechanical fulcrum with the thumb, exerting a lateral reciprocating force. The bristle bundle 3 acts vertically on the gingival sulcus at a 60° bend angle, and the TPE anti-slip layer (surface of the brush handle 1) generates a friction force of 3.5N to prevent slippage, and the bristle tip removes subgingival plaque through elastic rebound.

[0148] 3. Occlusal cleaning stage: The brush head 2 is flat against the tooth crown, and the gathering structure of the bristle bundle 3 disperses the pressure to each single filament. The material's 90% rebound rate allows the bristle tips to evenly cover the uneven structure of the tooth surface.

[0149] 4. Flushing and resetting: After the external force is removed, the bristle bundle 3 returns to the initial bending angle (±2° error) within 0.5 seconds. The elliptical cross-section design of the brush handle 1 allows the water flow to quickly wash away the residue, and the diamond-shaped protrusions (on the surface of the brush handle 1) prevent the brush from slipping out of the hand due to wetness.

[0150] The entire process achieves triple cleaning of the tooth gaps, gingival sulcus and occlusal surface in a single brushing action through the ergonomic conduction force of the brush handle 1, the directional movement of the brush head 2 and the dynamic deformation of the bristle bundle 3.

[0151] In summary, the embodiments of the present application provide a toothbrush with bent bristles and a preparation method thereof, wherein the bristles on both sides of the bristle bundle are bent toward the middle to form a gathering structure, thereby enhancing the fit to the gaps between teeth, gingival sulcus and other parts, improving the cleaning efficiency, and reducing residual dirt and bacteria. With a bending angle of 30°-60° and soft elastic material, it not only ensures the cleaning effect, but also reduces irritation and damage to the gums, and is especially suitable for people with sensitive gums.

[0152] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0153] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0154] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and deform the above embodiments within the scope of the present application.

Claims

1. A toothbrush with bent bristles, characterized in that: It comprises a brush handle (1) and a brush head (2), wherein: The brush head (2) is connected to one end of the brush handle (1), and a plurality of bristle bundles (3) are arranged on the brush head (2); The bristles in the bristle bundle (3) are divided into two sides, and the tops of the bristles on the two sides are respectively bent toward the middle to form a bent structure that gathers toward the middle.

2. A toothbrush with bent bristles according to claim 1, characterized in that: The bending angle of the top of the bristle is 30° to 60°.

3. A toothbrush with bent bristles according to claim 1, characterized in that: The bristles are made of soft and elastic material.

4. A toothbrush with bent bristles according to claim 1, characterized in that: The surface of the brush handle (1) is provided with an anti-slip texture, and the shape of the brush handle (1) conforms to ergonomic design and is easy to hold.

5. A method for preparing a toothbrush with bent bristles as claimed in any one of claims 1 to 4, characterized in that: The method is a pre-bending and then implanting method, comprising the following steps: S1: pre-bend bristle monofilaments with a diameter of 0.08-0.15 mm at a predetermined angle of 30°-60° to form bristle tufts with both sides gathered toward the middle; S2: implanting the pre-bent hair tufts into the hair implanting holes of the brush head (2) by a high-speed hair implanting machine, wherein each tuft contains 30-50 monofilaments; S3: The implanted brush head (2) is fixed with resin and the bristle tips are rounded to make the roundness of the bristle tips reach R0.01mm level.

6. A method for preparing a toothbrush with bent bristles as claimed in any one of claims 1 to 4, characterized in that: The method is a normal post-implantation thermal bending method, comprising the following steps: S1: implanting unbent bristle monofilaments into the implanting holes of the brush head (2) in a concentric circle structure, with the monofilament diameter being 0.15-0.18 mm and 36-48 strands per cluster; S2: placing the implanted brush head (2) in a heating device at 135°C-145°C, and heating the 10-15 mm section at the top of the bristles for 30-60 seconds; S3: Use a precision mold with a V-groove to apply lateral pressure to the heated bristles, so that the bristles on both sides are bent toward the middle to form an angle of 30°-60°; S4: Cool at room temperature for 1-2 minutes to allow the bristles to set and restore the elastic modulus to 500-800 MPa.

7. A method for preparing a toothbrush with bent bristles as claimed in any one of claims 1 to 4, characterized in that: The method is a die bending forming method, comprising the following steps: S1: preparing a forming die with a predetermined bending angle (30°-60°), wherein the die comprises symmetrical double-sided extrusion blocks, and the extrusion surface angle is consistent with the target bending angle; S2: placing the unbent bristle monofilament into the mold cavity, and directly forming the bristle tips into a structure gathered toward the middle in the mold through injection molding or hot pressing process; S3: implanting the formed bristle bundle (3) into the brush head (2), and fixing the implanted bristle area by ultrasonic welding; S4: performing antibacterial treatment on the surface of the brush head (2) to form a silver ion coating with a thickness of 5-10 μm.

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