TWI685313B - Teeth cleaning device with spiral soft rubber bristles and soft rubber appearing on the grip part and its mold device - Google Patents

Abstract

The invention is a tooth cleaning device with a spiral soft rubber bristle part and soft rubber showing on the handle part and a mold device thereof. The tooth cleaning device can be composed of a handle part, a floss fixing section and a bristle part , Wherein both ends of the handle portion can be connected to the floss fixing section and the bristle portion, and the bristle portion includes a rod body and a plurality of bristles, and one end of the rod body can be connected to the grip portion , Each of the bristles is arranged in a spiral manner on the outer edge surface of the rod body to form a spiral soft rubber bristle part, and the starting point of the injection of the plasticized material that can form the bristles is located in the handle The position of the part is to form an external totem or mark. In this way, the bristles can clean the dirt attached to the tooth surface or the tooth gap at many different angles, and the external totem or mark can also achieve the effect of advertising. .

Description

Teeth cleaning device with spiral soft rubber bristles and soft rubber appearing on the grip part and its mold device

The invention relates to a tooth cleaning device and a mold device, in particular to a tooth cleaning device having a spiral soft rubber bristle portion, and a mold device capable of forming the spiral soft rubber bristle portion.

According to the American Academy of Periodontal Diseases, patients with periodontal disease are twice as likely to suffer from coronary artery disease as compared with people without periodontal disease. The main reason is that the bacteria of periodontal disease can flow along the blood, while in The formation of fatty plaques on the coronary artery lumen that provides heart nutrition causes the arterial wall to thicken and cause thrombosis. Therefore, chronic inflammation caused by gum disease has been associated with cardiovascular diseases such as heart disease, blood vessel blockage and stroke. Relevance; in addition, adults with gingivitis (gingival swelling, bleeding) perform poorly on memory and other cognitive tests compared to adults with healthy gums and teeth. Health is closely related.

In addition to the aforementioned health factors, maintaining good oral hygiene is also one of the essential requirements for maintaining the quality of life. After all, healthy teeth can make people maintain full self-confidence when social chatting, which in turn increases the charm and style of speaking. At present, most people keep their mouths clean by brushing their teeth and gargle. Although the "toothbrush" has a good effect of removing plaque on the cheeks, lips, tongue and occlusal surfaces of the human body, but Tooth tartar between adjacent teeth, toothbrushes cannot achieve a complete cleaning effect. Therefore, people usually use dental cleaning tools that can pass through the gaps between teeth (or interdental, interdental) to effectively clean adjacent teeth Interdental teeth Tartar.

The flossing tools that are commonly used today (especially the aforementioned interdental tartar cleaning of adjacent teeth) are mostly floss sticks and interdental brushes. Generally speaking, the conventional floss stick includes a floss fixing part and a A grip portion, wherein the floss fixing portion is U-shaped, and two corresponding ends are fixedly connected to both ends of a floss, and the grip portion is fixedly connected to the floss fixing portion for a user Hold, so that the user can take the grasping part of the conventional dental floss stick after the meal and put the dental floss fixing part into the entrance, so that the dental floss on the dental floss fixing part can be used Scrape off the tooth surface and tartar between teeth. However, because the dental floss is tight and straight on the conventional dental floss rods, the user must completely penetrate the dental floss between the teeth to remove the debris and tartar between the teeth. The dental floss is too small and the dental floss is not easy to enter In the case of teeth, the residue and tartar near the gums are not easy to be removed, and the user is also prone to excessive force, which causes the tight floss or hard floss fixation to hit the gums, causing bleeding of the gums.

In view of the above, in view of the aforementioned lack of use, people will also choose to use the interdental brush to clean the teeth. In addition, the existing interdental brush is a small brush head with a volume similar to a toothpick, but with bristles. The bristles of the intermediary brush penetrate into the tooth gap to easily remove the residue and tartar near the gums from the tooth gap with the bristles on the tooth. At the same time, the elastic bristles can be used to massage the gum back and forth. It can not only remove the residue and tartar of the teeth near the gums, but also promote the blood circulation of the gums by massage, avoid the bleeding and bleeding of the gums, and achieve the purpose of oral health care. Since neither the dental floss stick nor the interdental brush can simultaneously achieve the effect of completely removing the residue between the teeth and massaging the gums, for users who pay attention to oral health, they must still use the dental floss stick and the interdental brush in order to achieve Completely remove dental residues and massage the gums for oral health effects. Since dental floss sticks or interdental brushes are small products, when users go out, they need to carry and store separate dental floss sticks and interdental spaces, respectively. Brushing is bound to cause user's sleepiness Disturbance and inconvenience.

Although some manufacturers have designed to add bristles to the end of the dental floss bar, the actual production and use still have the following defects: (1) Most existing interdental brushes are made of the same material, so Provide a certain strength, easy for the user to hold, and can be smoothly inserted between the teeth, especially when the teeth are small, so that the material of the interdental brush is hard, and it is easy to cause gum injuries; if it is made of a material with lower hardness The interdental brush is easy to be bent and deformed by the user's grip, which is unfavorable; (2) The bristles of the existing interdental brush are generally set in two rows, and the interval angle of each row of bristles is 180 degrees (that is, Symmetrical arrangement), therefore, when one row of bristles cleans the gap between one tooth root and gums, the other row of bristles does not work, reducing the convenience of cleaning; (3) for the problem of point (1) Although some manufacturers use the second injection molding method, the body of the interdental brush is first made of one plasticized material, and then the bristles are made of another plasticized material, but the structure of the foregoing interdental brush is to use another plastic After the one end of the interdental brush is completely covered by the chemical material, the bristles are protruded on it. Therefore, the manufacturer needs to fix the other end of the interdental brush with a mold to be able to shoot out the other mold to form the bristles. Not only will the complexity of the mold increase, but also the amount of another plasticized material will increase, making the production cost of the industry high.

Therefore, how to improve the aforementioned problems in order to provide users with a better experience and at the same time can reduce the production costs of the industry has become an important issue in the industry's urgent research and development improvement, and it is also an important issue for the present invention to discuss here. Subject.

In view of the fact that there are still imperfections in the use of conventional dental floss sticks and interdental brushes, the inventor finally developed and designed a tool of the present invention after long-term hard research and experiment The tooth cleaning device and the mold device of the spiral soft rubber bristle portion and the soft rubber appearing on the handle portion are expected to solve the aforementioned conventional problems effectively by the advent of the present invention and can be favored by users.

An object of the present invention is to provide a tooth cleaning device with a spiral soft rubber bristle portion and soft rubber exposed on the grip portion, including a grip portion, a floss fixing section and a bristle portion, wherein the grip The end can be held by the user's fingers, one end can be connected to the side edge of the floss fixing section, the other end can be connected to the bristle section, and the floss fixing section will be U-shaped, and its phase A floss is provided between the corresponding two supporting arms. Furthermore, the bristle portion can be composed of at least one rod body and a plurality of bristles, and one end of the rod body is connected to the other end of the grip portion, and the The rod body and the handle part are made of a first plasticized material in a first injection molding process; each of the bristles is made of a second plasticized material in a second injection molding process , And the bristles are arranged in a spiral arrangement on the outer surface of the rod body at intervals to form a spiral soft rubber bristle part, and two adjacent bristles on the same side in the axial direction are separated by a distance from each other To form a dirt-retaining space; the material hardness of the second plasticized material will be lower than that of the first plasticized material, and the starting point of injection of the second plasticized material is located on the handle Position to use the second plasticized material to form a totem or a mark on the corresponding position of the grip portion; thus, with the tooth cleaning device of the present invention, when the user uses the bristle portion to clean the tooth gap, that is The bristles can be used to remove dirt and food debris embedded in the tooth surface or tooth gap along a variety of different angles, greatly improving the convenience and efficiency of cleaning, and the appearance of totems or marks can also reach advertising or eye-catching. Of effect.

Another object of the present invention is to provide a mold device for producing a tooth cleaning device with a spiral soft rubber bristle portion, which includes a lower mold and an upper mold, wherein the lower mold is provided with a lower accommodating groove, the lower accommodating The inner wall of the groove is provided with a plurality of lower protrusions and a plurality of lower openings, and each of the lower protrusions is spaced apart from each other to form a filling space therebetween, and each of the lower openings is arranged adjacent to each other In the lower injection space between the two lower protrusions, the upper mold is provided with an upper accommodating groove. The inner wall of the upper accommodating groove is provided with a plurality of upper protrusions and a plurality of upper openings, each of the upper protrusions Spaced apart from each other to form an upper injection space therebetween, and each of the upper openings is arranged in the upper injection space between the adjacent two upper bumps, when the lower mold is combined with the upper mold, the The lower injection space will be connected with the corresponding upper injection spaces to form a continuous spiral thread injection space, and when the rod body of the dental cleaning device extends into the lower receiving groove and the upper receiving groove, The partial outer edge surface of the rod body will be clamped by each of the lower projections and each of the upper projections, and after the plastic injection material is poured into the threaded injection space, a spiral will be formed on the outer edge surface of the rod body Soft rubber bristles.

In order for your reviewing committee to have a better understanding and understanding of the purpose, technical features and efficacy of the present invention, the following examples are used in conjunction with the drawings, which are described in detail as follows:

〔Knowledge〕

no

〔this invention〕

1‧‧‧Teeth cleaning device

11‧‧‧ Grip

111‧‧‧ Anti-slip part

112‧‧‧Bump

113‧‧‧Gap

13‧‧‧Fixed dental floss

131‧‧‧support arm

133‧‧‧Dental floss

15‧‧‧Bristles

151‧‧‧rod

153‧‧‧Bristles

154‧‧‧fouling space

155‧‧‧Spiral soft rubber bristles

2‧‧‧Mould device

20‧‧‧Injection port

21‧‧‧ Lower mold

210‧‧‧lower holding slot

211‧‧‧Lower bump

212‧‧‧lower opening

214‧‧‧Lower injection space

22‧‧‧Upper mould

220‧‧‧Upper storage slot

F1, F2‧‧‧Diameter

H1‧‧‧Axial width

H2‧‧‧Region length

Figure 1 is a schematic perspective view of the tooth cleaning device of the present invention; Figure 2 is a schematic view of the bristle portion of the present invention; Figure 3 is a schematic view of the tooth cleaning device and mold device of the present invention; Figure 4 is a mold of the present invention Partial schematic diagram of the device; Figure 5 is a schematic diagram of the tooth cleaning device and injection port of the present invention; and Figure 6 is a partially enlarged schematic diagram of the bristle portion of the present invention.

The present invention is a tooth cleaning device with a spiral soft rubber bristle portion and the soft rubber is exposed on the handle portion and its mold device. In an embodiment, please refer to FIGS. 1 is at least composed of a handle portion 11, a floss fixing section 13 and a bristle portion 15, wherein the handle portion 11 can be held by a user with a finger, and one end of the handle portion can be connected to the floss fixing section 13, the floss fixing section 13 is U-shaped, and a floss 133 is provided between the corresponding two supporting arms 131. In this embodiment, the floss 133 can be wound by multiple strands of nylon fibers (But not limited to this), so that the user can push the dental floss 133 into the tooth gap to perform cleaning work on food residue, tartar and plaque in the tooth gap. In this embodiment, both the floss fixing section 13 and the grip portion 11 can be made with a first plasticizing material (such as PP (polypropylene), ABS (Acrylonitrile Butadiene Styrene Copolymer) in a first injection molding process ), HIPS (High Impact Polystyrene)... etc.) to improve production convenience.

Please refer to FIGS. 1 to 2 again. In this embodiment, at least one side of the grip portion 11 is provided with a slip prevention portion 111 (as shown in FIG. 2 ). The slip prevention portion includes a plurality of protrusions 112. The bumps are separated from each other to form a gap 113. When the user holds the grip portion 11, part of the skin of the user's finger will sink into the corresponding gap 113 of the adjacent bump 112, and then It can increase the frictional force of the finger holding the grip portion 11, so that the user can stably hold the grip portion 11 when cleaning the teeth with the tooth cleaning device, avoiding the user's "hand slip" and causing the use Inconvenience. However, in other embodiments of the present invention, the manufacturer can adjust the appearance of the anti-slip portion 111 according to product requirements or not provide the anti-slip portion 111. In particular, the anti-slip portion 111 on the handle portion 11 can be made of a first plasticized material in the first injection molding process, in addition to integral injection molding, it can also use different materials and processes , Set on the handle part 11, first Chen Ming.

Please refer to FIGS. 1 to 3, in this embodiment, the bristle portion 15 includes a rod body 151 and a plurality of bristles 153, wherein one end of the rod body 151 is opposite to the other end of the handle portion 11 Connected, and both the rod body 151 and the grip portion 11 will be in the first injection molding process, with the Made of the first plasticized material, and the bristles 153 are made of a second plasticized material (such as TPE (thermoplastic elastomeric) or other medical grade elastomer) in a second injection molding process, And each of the bristles 153 will be arranged on the outer edge surface of the rod body 151 in a spiral arrangement manner to form a spiral soft rubber bristle portion 155, as shown in FIG. 3, each of the bristles 153 is formed by Adjacent to one end of the rod body 151, spirally arranged along the circumferential direction of the rod body 151 to the other end adjacent to the rod body 151, and the spiral soft rubber bristle portions 155 are on the same side in the axially adjacent circle They are spaced apart from each other to form a spiral-shaped dirt-retaining space 154. In this embodiment, the axial width of the dirt-retaining space 154 is preferably 0.2 mm to 0.45 mm.

In this embodiment, the dentifrice device 1 of the present invention can be made at least through the subsequent basic mold device 2. To avoid overly complicated drawings, the applicant simplified the mold structure and only drawn the necessary features. As shown in FIGS. 4 and 5, the mold device 2 includes a lower mold 21 and an upper mold 22, wherein the lower mold 21 is provided with a lower containing groove 210, and the inner wall of the lower containing groove 210 is protruded with a plurality of lower protrusions 211 and a plurality of lower openings 212 are provided, each of the lower bumps 211 is spaced apart from each other to form a lower injection space 214 therebetween, and each of the lower openings 214 is disposed between two adjacent lower bumps 211的下注料空间214. Moreover, the upper mold 22 is provided with an upper accommodating groove 220, and the upper accommodating groove 220 also has a plurality of upper bumps, upper openings and upper injection spaces, and the aforementioned components (ie, upper bumps, upper openings and upper injections) The connection relationship of the material space) is the same as the structure of the lower mold 21, so it will not be described in detail, and the above-mentioned accommodating groove 220 in FIG. 5 also omits the aforementioned elements (ie, the upper bump, the upper opening, and the upper injection space). It is specifically stated here that the lower and upper mold 21 and upper mold 22 of the present invention are based on the positional relationship of FIG. 4 for illustrative purposes only. For practical use, the manufacturer can adjust the left mold to the left mold according to production needs. The right mold, even disassembled into more than three molds, as long as these molds are assembled into one body, have the aforementioned structure and subsequent process, which is called the present invention 之模装置2。 The mold device 2.

Please refer to Figures 4 and 5 as shown, the manufacturer can first use the first plasticized material (such as PP, ABS, HIPS... etc.) in the first injection molding process, the injection body is formed by integral injection molding 151 and the grip portion 11, after that, the rod body 151 can extend into the lower receiving groove 210 or the upper receiving groove 220, and when the lower mold 21 and the upper mold 22 are combined, the lower protrusions 211 and the upper The protrusions will clamp the partial outer edge surface of the rod body 151, so that the dental cleaning device 1 can be firmly positioned at the current position, and at the same time, the lower injection spaces 214 will be connected with the corresponding upper injection spaces, In order to form a continuous spiral thread injection space, the manufacturer can inject a second plasticized material (eg, TPE or TPE) into the thread injection space (ie, the lower injection space 214 and the upper injection space) Other medical grade elastomers) to form a spiral soft rubber bristle portion 155 as shown in FIG. 3 on the outer surface of the rod body 151, so that the hardness of the plasticized material of the bristles 153 will be lower than that of the rod The hardness of the plasticized material of the body 151 can effectively protect the teeth, gums and gum nipples of the user by the soft materials of the bristles 153 to avoid being scratched, punctured or abraded by the hard structure.

In addition, when a person uses the bristle portion 15, the bristle portion 15 is usually inserted back and forth reciprocatingly, but the distance between the front and back of the tooth gap will not be too long, so please refer to Figures 3 and 6, as shown in this embodiment In the meantime, the total length of the spiral soft rubber bristle portion 155 will be less than 22 mm, and the number of windings is about 10 to 19 turns, and the axial width H1 of each turn is 0.65 mm to 1.15 mm to meet the cleaning needs And the purpose of saving materials. Furthermore, in order to make the bristle portion 15 easier to extend into the tooth gap, in this embodiment, the thickness of the rod body 151 can be gradually reduced from one end to the other end, and the thickness of the thinnest part of the rod body 151 0.3 mm to 0.45 mm, the thickness of the thickest part of the rod body 151 is 0.55 mm to 0.65 mm, so that the other end of the rod body 151 can be easily inserted into the tooth gap, and by increasing the thickness, these The bristles 153 can lean against the periphery of the teeth to remove tartar and plaque on the surface of the teeth, In addition, the length H2 of the area without the bristles 153 at the other end of the rod 151 can be 0.5 mm to 2 mm, so that the other end of the rod 151 can be easily inserted into the tooth gap, but in other embodiments of the invention In this case, the manufacturer can adjust the thickness of each position of the bristle portion 15 according to production requirements.

As mentioned above, please refer to Figures 3 and 6 again. In this embodiment, the length of the bristles 153 can also be gradually reduced from one end of the rod body 151 to the other end (as shown in Figure 3 from bottom to top To show the residue and tartar between the teeth through multiple rows of bristles 153 and their length changes, and allows the user to control the length of the rod 151 inserted into the teeth according to the size of his teeth , To avoid the excessively long bristles 153, which hinders the degree of insertion of the rod body 151 into the tooth gap; in this embodiment, the length of the longest bristles 153 is preferably 0.4 mm to 0.7 mm, and the length of the shortest bristles 153 is preferably 0.15 mm To 0.4 mm; and the diameter F1 of the top (or end) of the bristles 153 is preferably 0.15 mm to 0.35 mm, and the diameter F2 of the bottom of the bristles 153 is preferably 0.35 mm to 0.7 mm, so that the bristles 153 can form a cone.

Finally, please refer to Figures 1 to 4 again. In this embodiment, the mold device 2 is also provided with a filling port 20. For ease of illustration, Figure 1 only draws the filling port 20 in dotted lines, but this Those skilled in the art should set up the injection port 20 in the mold device 2 according to the actual needs, which will be described in advance. In addition, the injection port 20 corresponds to the area of the handle portion 11 of the dentifrice device 1 to use the plasticized material to form the bristles 153, which can be coated from the handle portion 11 toward the rod body 151, Until it is poured into the threaded injection space (ie, the lower injection space 214 and the upper injection space), which means that the starting point of injection of the second plasticized material of the present invention is located in the grip The position of the portion 11 to form a totem or a mark, or even a slip-proof structure, at the corresponding position of the handle portion 11 using the second plasticized material; for example, the totem or the mark may be a decoration Or trademark logo or text, and the color of the second plasticized material can be different from the color of the first plasticized material, so that the Totems or marks are prominently displayed on the grip portion 11 and become the focus of the user's attention. In addition, the soft rubber material can also be a force point that the user cannot easily loose and drop when holding.

To sum up, it can be seen that referring to Figures 1~5, with the overall structure and manufacturing process of the dentifrice device 1 of the present invention, the following effects can be achieved: (1) When the user extends the bristle portion 15 into By the time of the tooth gap, the structure of the spiral soft rubber bristle part 155 enables the bristles 153 to be thoroughly cleaned and removed along a variety of different angles and tightly attached and stuck in the surface of the teeth or the dirt and teeth Food debris to effectively ensure the health of gums and teeth; (2) When the manufacturer uses different injection molding processes and uses different plasticized materials to make the rod body 151 and the bristles 153 separately, due to the bristles of the present invention The dirt-retaining space 154 of the portion 15 (as shown in FIG. 3) is not covered with plasticized material and is in a threaded state. Therefore, compared with the conventional interdental brush (ie, the conventional interdental brush One end will be completely covered with plasticized material) For tooth cleaning device 1 of the present invention obviously consumes less material, which can reduce the production cost of the manufacturer; (3) When the user extends the bristle portion 15 to When the tooth cleaning device is rotated and the tooth cleaning device 1 is rotated, in addition to strengthening the bristles 153 at various angles, it can repeatedly scrape and clean the tartar and debris in the tooth surface or tooth gap. At the same time, during the aforementioned rotation process, The aforementioned tartar and residues will also be concentrated in the space 154 between adjacent bristles 153 spaced apart from each other, to avoid that the scraped tartars and residues hinder the cleaning effect of these bristles 153; (4) The soft plastic formed by the second plasticized material can be directly displayed on the handle portion 11 for advertising or aesthetic purposes, and the soft plastic material can be easily released by the user when holding it Dropped force point.

According to the above, it is only a preferred embodiment of the present invention, but The scope of Zhang’s rights is not limited to this. According to those skilled in the art, the equivalent changes that can be easily thought of based on the technical content disclosed by the present invention shall fall within the protection scope of the present invention.

1‧‧‧Teeth cleaning device

11‧‧‧ Grip

13‧‧‧Fixed dental floss

131‧‧‧support arm

133‧‧‧Dental floss

15‧‧‧Bristles

151‧‧‧rod

153‧‧‧Bristles

20‧‧‧Injection port

Claims (17)

A tooth cleaning device with a spiral soft rubber bristle portion and soft rubber can be exposed on the grip portion, including: a grip portion for fingers to hold; a dental floss fixing section, which is U-shaped and corresponding The second supporting arm is provided with a floss, the side edge of the floss fixing section will be connected to one end of the grip portion; and a bristle portion, including a rod body and a plurality of bristles, wherein, one end of the rod body It is connected to the other end of the handle part, and the rod body and the handle part are made of a first plasticized material in a first injection molding process; the bristles are in a second In the injection molding process, it is made of a second plasticized material, and the bristles are arranged in a spiral arrangement at intervals on the outer edge surface of the rod body to form a spiral soft rubber bristle portion, Moreover, the adjacent spiral circles of the soft rubber bristle part on the same side will be separated from each other by a distance to form a spiral-shaped dirt-retaining space; the material hardness of the second plasticized material is lower than that of the first plastic The material hardness of the plasticized material, and the starting point of the injection of the second plasticized material is located at the position of the handle portion, so as to use the second plasticized material to form a totem of the appearance at the corresponding position of the handle portion or One mark. The tooth cleaning device according to claim 1, wherein the length of the bristles gradually decreases from the end of the rod body toward the other end of the rod body. According to the tooth cleaning device of claim 2, the totem or the mark may be a pattern or text of decoration or trademark. As described in claim 3, the color of the second plasticizing material is different from the color of the first plasticizing material. The tooth cleaning device according to any one of claims 3 to 4, wherein the thickness of the rod body is gradually reduced from the end of the rod body toward the other end of the rod body, and the thickness of the thinnest part of the rod body It is 0.3 mm to 0.45 mm, and the thickness of the thickest part of the rod is 0.55 mm to 0.65 mm. The tooth cleaning device according to claim 5, wherein the longest bristle length is 0.4 mm to 0.7 mm, The shortest bristle length is 0.15 mm to 0.4 mm. The tooth cleaning device according to claim 6, wherein each of the bristles has a cone shape, and the diameter of the tip thereof is 0.15 mm to 0.35 mm. The tooth cleaning device according to claim 7, wherein the diameter of the bottom end of each of the bristles is 0.35 mm to 0.7 mm. The tooth cleaning device according to claim 8, wherein the total length of the spiral soft rubber bristle portion is less than 22 mm. The tooth cleaning device according to claim 9, wherein the number of turns of the spiral soft rubber bristle portion is 10 to 19 turns. The tooth cleaning device according to claim 10, wherein the axial width of each turn of the spiral soft rubber bristle portion is 0.65 mm to 1.15 mm. The tooth cleaning device according to claim 11, wherein the axial width of each of the dirt-retaining spaces is preferably 0.2 mm to 0.45 mm. The tooth cleaning device as claimed in claim 12, wherein the length of the area where the other end of the rod body is not provided with the bristles can be 0.5 mm to 2 mm. The tooth cleaning device according to claim 13, wherein at least one side of the grip portion is provided with a slip prevention portion, so as to increase the frictional force of a finger gripping the grip portion. The tooth cleaning device according to claim 14, wherein the anti-slip portion includes a plurality of protrusions, the protrusions are separated from each other by a distance to form a gap, and when the finger holds the handle portion, the Part of the skin can sink into the corresponding gap of each of the adjacent bumps to increase the friction of the finger holding the grip portion. A mold device for producing a tooth cleaning device with a spiral soft rubber bristle portion and soft rubber that can be exposed on the grip portion includes: a lower mold, which is provided with a lower receiving groove, and the inner wall of the lower receiving groove is convex There are multiple A plurality of lower openings are provided on the projections and each of the lower projections is spaced apart from each other to form a lower injection space therebetween, and each of the lower openings is disposed between the two adjacent lower projections Space; and an upper mold, on which an upper receiving slot is opened, and the inner wall of the upper receiving slot is provided with a plurality of upper protrusions and a plurality of upper openings, each of the upper protrusions is separated from each other by a distance An upper injection space is formed therebetween, and each upper opening is arranged in an upper injection space between two adjacent upper bumps; in a state where the lower mold is combined with the upper mold, the lower injection materials The space will be connected with the corresponding upper injection spaces to form a continuous spiral thread injection space. In a state where a rod of a dental cleaning device extends into the lower receiving groove and the upper receiving groove, the Part of the outer edge surface of the rod body will be clamped by each of the lower protrusions and each of the upper protrusions, and after the threaded injection space is filled with plasticized material, a spiral will be formed on the outer edge surface of the rod body The soft rubber bristle-shaped portion, and after the lower mold and the upper mold are separated from the rod body, a spiral-shaped dirt-retaining space is formed on the outer edge surface of the rod body. The mold device according to claim 16, wherein a filling port corresponds to an area of a grip portion of the dentifrice device so that the plasticized material can be coated from the grip portion toward the rod body, Until the thread filling space.

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