CN114145561B

CN114145561B - Preparation method of brush head with retainer

Info

Publication number: CN114145561B
Application number: CN202111496616.9A
Authority: CN
Inventors: 邓涛
Original assignee: Shenzhen Yiwuweilai Technology Co ltd
Current assignee: Shenzhen Yiwuweilai Technology Co ltd
Priority date: 2021-12-08
Filing date: 2021-12-08
Publication date: 2023-05-12
Anticipated expiration: 2041-12-08
Also published as: CN114145561A

Abstract

The invention discloses a preparation method of a brush head with a retainer, which comprises the steps of inserting a plurality of bristle tufts into corresponding retaining rings on the retainer; applying heat to the proximal ends of a plurality of said bristle tufts at a temperature and distance sufficient to at least partially melt the proximal ends of said bristle tufts to effect heat melting to produce a proximal head; placing the retainer, which is thermally fused to generate the proximal head, into an inner cavity of a jig; placing a jig placed in the retainer into an inner cavity of a mold; injection molding the brush handle through a cavity for injection molding the brush handle; the position of the die is adjusted, so that a pore canal capable of injecting the soft rubber is combined with the jig, and injection molding of the soft rubber is realized to form a soft rubber main body; and taking the prepared brush head out of the die and the jig. The invention aims to provide the preparation method of the brush head, which has the advantages of simple technical process, firm brush hair of the prepared brush head and good use experience.

Description

Preparation method of brush head with retainer

Technical Field

The invention belongs to the field of toothbrush production and manufacturing, and particularly relates to a preparation method of a brush head with a retainer.

Background

From the very beginning of metal tufting technology to the increasing adoption of metal-free tufting technology by businesses today, with the development of the brush head manufacturing process, both manual toothbrushes and electric toothbrushes have brush heads that include bristles for cleaning teeth, tongue and cheeks. In some toothbrushes, the bristles are organized into bristle tufts contained within a retaining ring. The retaining ring is used to secure the bristle tufts within the brush head and generally has a hollow circular shape with an inner and outer circumference. During manufacture, tufts of bristles are inserted into the hollow interior of the retaining ring, and then heat is used to fuse the bristles together to form a head that cannot be pulled through the retaining ring. However, the retaining ring is typically not securely fixed within the brush head. Thus, the ring and tufts of bristles may be loose or become loose within the brush head and the bristles may not always be positioned at the optimal angle for brushing. As such, in dynamic conditions such as movement caused by operation of an electric toothbrush, the bristle tuft structure may be subjected to high stresses under dynamic movement, which may result in separation. In addition, the process of organizing bristles into tufts within a retaining ring, and then cooling or allowing the brush head material to cool in order to secure the tufts in place can be time consuming and expensive.

In view of the above-mentioned drawbacks, some prior art techniques provide for a plurality of retaining rings and a plurality of bristle tufts, and then inserting the plurality of bristle tufts into the plurality of retaining rings; then melting the bristle tuft proximal ends to create a proximal head portion; creating a first space between each of the proximal head portions and the respective retaining ring; positioning a brush neck relative to the proximal head portion, wherein the positioning of the brush neck defines a second space relative to the proximal head portion; finally, a thermoplastic elastomer is injected, surrounding the brush neck, the plurality of retaining rings, and an elastomer matrix of the proximal head portion, wherein the elastomer matrix fills the first space and the second space.

Although the above method solves the drawbacks mentioned in the first paragraph, the manufacturing process is complicated, because in the prior art, the brush head and the brush neck must be manufactured separately, and a machine dedicated to manufacturing the brush neck and a machine dedicated to manufacturing the brush head are required, and in the prior art, the manufacturing of the brush head on one machine must be performed after the brush neck is manufactured on the other machine in the process of manufacturing the brush head, because before the manufacturing of the brush head begins, the manufactured brush neck must be put into the mold for manufacturing the brush head in advance, so that the manufacturing of the brush head and the forming of the brush head can be performed, thereby making the process thereof complicated.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, the present invention aims to provide a method for manufacturing a brush head, which has the advantages of simple process, firm bristle fixation and good brush head use experience.

The patent scheme provides a preparation method of a brush head with a retainer, which comprises the following steps:

s2: inserting a plurality of bristle tufts into respective corresponding retention rings on a retainer, creating proximal ends of the bristle tufts, said proximal ends being proximal to said retention rings, and free ends, said free ends being distal from said retention rings;

s3: applying heat to the proximal ends of a plurality of said bristle tufts at a temperature and distance sufficient to at least partially melt the proximal ends of said bristle tufts to effect heat melting to produce a proximal head;

s4: placing the retainer, which is thermally fused to generate the proximal head, into an inner cavity of a jig, wherein the proximal head is higher than the jig;

s5: placing a jig placed in the retainer into an inner cavity of a mold, so that the free ends of the bristle tufts are positioned in the mold, and ensuring that the whole jig is stably fixed in the mold;

s6: the brush holder is formed by injection molding through a cavity for injection molding the brush holder, the brush holder is provided with an insertion part, and the insertion part is molded above the retainer or covers the retainer;

s7: the position of the die is adjusted so that a pore canal capable of injecting soft rubber is combined with the jig, injection molding of the soft rubber is realized to form a soft rubber main body, and the soft rubber main body respectively covers the inserting part of the brush handle, the retainer and the proximal head, so that the preparation of the brush head is completed;

s8: and taking the prepared brush head out of the die and the jig.

Further, the method further comprises the following steps:

s1: preparing a retainer, wherein a plurality of retainer rings are arranged on the retainer.

Further, in the step S3: and any two adjacent proximal head parts are closely attached to each other and each proximal head part is closely attached to the retaining ring.

Further, in the step S3: the proximal head adjacent the cage side wall is flush with the cage side wall.

Further, all of the proximal head portions are flush with the side walls of the cage, or the proximal head portions form a concave surface of less curvature within the cage.

Further, in the step S4: the free ends of the bristle tufts are placed into the inner cavity of the jig, and the side walls of the retainer are higher than the jig.

Further, in the step S5: a gap is arranged between the inner side wall of the cavity of the die and the outer side wall of the retainer, and the gap is communicated with the cavity channel for injection molding the brush handle.

Further, in the step S6: the cavity channel for injection molding the brush handle is arranged on the die or the jig.

The improvement of this patent brings the following advantage:

(1) In the prior art, the brush head and the brush handle must be manufactured separately, and a machine specially used for manufacturing the brush handle and a machine specially used for manufacturing the brush head are needed. The prior art has required that the brush handle be manufactured on one machine before the brush head can be manufactured on another machine. Because the manufactured brush handle is placed in a mold for manufacturing the brush head before the manufacture of the brush head is started, the manufacture of the brush head can be performed on the brush handle. The process is complicated, and the used machine equipment and dies are more. The brush head and the brush handle are assembled on the same machine for manufacturing, so that the brush neck and the brush head are manufactured in a rapid integrated manner. Specifically, bristles (bristle clusters) are inserted into a retainer, a proximal end head is formed through hot melting, then the retainer is placed into a jig, the jig is placed into a mold, a brush handle is formed through injection molding of hard rubber, and finally, the position of the mold is adjusted, so that soft rubber injection molding is realized to form the brush head. The method can directly start the manufacture of the brush head without manufacturing the brush handle in advance, the manufacture of the brush handle is skillfully integrated in the manufacture of the brush head, the process flow for manufacturing the brush head is simplified, the time is saved, the manufacturing process is optimized, and the manufacturing efficiency is greatly improved.

(2) In the prior art, when the brush handle is injection molded, excessive injection molding pressure acts on the proximal end head of the bristle cluster, so that the bristles are deformed and bent, and the product quality is seriously affected. And this application supports the fixing through using holder and tool to the brush hair cluster on the whole, when having overcome the brush handle of moulding plastics, the too big problem that leads to the brush hair to warp of pressure of moulding plastics improves the yields, practices thrift the cost.

(3) In addition, the brush head of the application also uses an integrated retainer, compared with a plurality of scattered retainer rings used in the prior art, the integrated retainer used in the application can be used for quickly inserting bristle clusters during the preparation of the brush head, so that the manufacturing process is simplified, and the efficiency is improved; on the other hand, the integrated holder can more effectively fix the bristle tufts.

Drawings

FIG. 1 is a schematic illustration showing steps of a method for manufacturing a brush head with a holder according to an embodiment;

FIG. 2 is a schematic view of a brush head according to an embodiment;

FIG. 3 is a schematic view showing a state in which a bristle tuft is inserted into a holder when a brush head is manufactured according to an embodiment;

FIG. 4 is a schematic view of an embodiment of a bristle tuft producing a proximal head when the brush head is prepared;

FIG. 5 is a schematic view showing a state in which the holder is placed in the jig when the brush head is manufactured;

FIG. 6 is a schematic diagram showing a state after soft rubber is injected in the process of preparing the brush head according to the embodiment;

wherein, brush handle 1, insert 11, brush head 2, bristle cluster 22, proximal end 23, free end 24, proximal end head 25, soft rubber body 26, holder 27, tool 4.

Detailed Description

Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention.

As shown in fig. 1 to 6, as an embodiment, a method for manufacturing a brush head with a holder includes steps S100 to S800. The brush head or brush head component manufactured by the application comprises a brush handle 1 and a brush head part 2, and can be installed and used on a manual toothbrush or an electric toothbrush.

S100: a holder 27 is prepared, and a plurality of holding rings are provided on the holder 27. The retainer 27 is produced by injection molding, and the retainer 27 has a flat grid shape, and each hole of the grid shape is a retainer ring. Or other structures that can be placed inside the elastomeric body 26 to restrain the fixed bristle tufts 22. The retainer can be used for better fixing the bristle tufts and improving the stress structure of the bristle tufts, so that a user can obtain better use experience.

S200: as shown in fig. 3, a plurality of bristle tufts 22 are inserted into respective corresponding retention rings on a retainer 27, creating proximal ends 23 and free ends 24 of the bristle tufts 22, the proximal ends 23 being proximal to the retention rings, and the free ends 24 being distal from the retention rings. The bristle tufts 22 are formed from a plurality of bristle filaments gathered together in a bundle. The bristle tufts 22 can have a variety of sizes and shapes with the proximal ends 23 thereof being embedded within the interior of the brush head to firmly secure the bristle tufts 22. The free end 24 extends outwardly to perform a cleaning function, and the free end 24 may be flush, inclined to one side, or convex in the middle.

S300: heat is applied to the proximal ends 23 of the plurality of bristle tufts 22 at a temperature and distance sufficient to at least partially melt the proximal ends 23 of the bristle tufts to effect heat melting to produce the proximal head 25, as shown in fig. 4. The heat fusing may be by direct contact with the proximal end 23 of the bristle tuft 22 using a heat source, or may be by indirect fusing of the proximal end 23 by heated air. The proximal head 25, which is formed by melting the proximal ends 23 of the tufts, is relatively large in diameter relative to the retaining ring, and by securing the retainer 27, the tufts 22 can be more firmly held to the head. As a more preferred aspect, any two adjacent proximal head portions 25 are closely attached or integrated together without creating a first space; all the proximal heads 25 are tightly connected or fused into a whole, so that the coating area of the soft rubber main body is increased, the bristle tufts are more firmly fixed, and the stress condition of the bristle tufts is improved. Each proximal head 25 is in close proximity to the corresponding retaining ring, creating no secondary space. All proximal heads 25 adjacent the side walls of the holder 27 are flush with the side walls of the holder 27. If the height of the upper part of the proximal head 25 is kept at the same level as the height of the side wall of the retainer 27, the maximum heat welding contact area between the proximal head 25 of the bristle cluster and the side wall of the retainer 27 can be ensured, and the connection between the proximal head 25 of the bristle cluster 22 and the retainer 27 can be more firm. Meanwhile, in the process of forming the head 2 of the brush head, the insertion portion 11 of the brush handle 1 corresponds to a cover, and needs to be covered on the proximal head 25, if the proximal head 25 is not flush, the insertion portion 11 and the proximal head 25 cannot be completely covered and matched.

S400: as shown in fig. 5, the holder 27, which is thermally fused to generate the proximal head 25, is placed in the inner cavity of the jig 4, and the proximal head 25 is raised above the jig 4. The jig 4 is made of a harder material and after the retainer 27 is placed into the cavity of the jig 4, the jig 4 may further integrally support and secure the proximal head 25 of the bristle tuft 22 on the basis of the retainer 27. In particular, the bristle tufts 22 are injection molded into the handle 1, and the proximal head 25 thereof provides support and retention when subjected to substantial injection molding pressures without causing forced deformation of the bristle tufts 22. Alternatively, one end of the jig 4 is concave towards the inside of the jig 4 to form a concave structure, and is provided with a cavity for accommodating the bristle tufts 22; the concave structure is used for accommodating the retainer 27, and positioning of the retainer 27 is achieved. Specifically, the bristle cluster 22 is inserted into the jig 4 facing the jig 4, and the side wall of the holder 27 is higher than the jig 4, i.e., the connection part of the bristle cluster 22 and the holder 27 is flush with the height of the jig 4, so that the bristle cluster 22 is just inserted into the jig 4. The proximal head 25 is higher than the jig 4 so as to be better embedded into the soft rubber body 26, so that the soft rubber can be better fully coated, and the fixing effect is enhanced.

S500: the jig 4 placed in the retainer 27 is placed in the cavity of the mold so that the free ends 24 of the bristle tufts 22 are positioned in the mold, ensuring that the entire jig 4 is stably secured to the mold. A gap is arranged between the inner side wall of the cavity of the mould and the outer side wall of the retainer 27, and the gap is used for communicating the cavity of the injection molding brush holder 1 and forming the brush holder 1 when hard glue is injected, so that the insertion part 11 of the brush holder 1 can be coated on the outer side wall of the retainer 27 or formed above the retainer 27. The mould is mainly used for injection moulding of the handle 1 and has an inner cavity which can accommodate the jig 4. When the jig 4 is placed in the mold, the free ends 24 of the bristle tufts 22 are placed into the cavity of the mold with the jig 4. In the horizontal direction, a gap is formed between the proximal head portion 25 and the side wall of the cavity of the mold, so that when the soft rubber is injected, the soft rubber can fully cover the proximal head portion 25, the fixing effect of the bristle tufts 22 is enhanced, and better use feeling is obtained.

S600: handle 1 is injection molded by a cavity for injection molding handle 1. Handle 1 has an insert 11. Insert 11 is molded over holder 27 or around holder 27. The cavity for injection molding the brush handle 1 can be arranged on a die or on the jig 4; when being arranged on the jig 4, the mold is also provided with a corresponding runner for injection molding the brush handle 1. A hard gel is injected into the mold through a cavity for injection molding the handle 1 using an injection molding machine to form the handle 1. The insertion part 11 of the brush handle 1 is formed by extending at least one part of one end surface of the brush handle 1, and is inserted into the soft rubber main body 26 of the brush head 2, so that the stress structure of one end of the brush head 2 is improved, and the use experience is improved. There is a certain gap between the insertion portion 11 and the proximal head portion 25 for soft gel injection, however, the insertion portion 11 may also be directly covered or coated on the proximal head portion 25 to obtain a better feel in use.

S700: the position of the mold is adjusted so that the hole channel capable of injecting the soft rubber is combined with the jig 4, and injection molding of the soft rubber is realized to form a soft rubber main body 26, and as shown in fig. 6, the soft rubber main body 26 respectively covers the insertion part 11, the retainer 27 and the proximal head part 25 of the brush handle 1, thereby completing preparation of the brush head. Specifically, the upper half of the mold is taken out and the mold is rotated horizontally by 180 °, so that the hole channel of the injection molding soft rubber on the injection molding machine is combined with the jig 4 (i.e., a two-color molding process), and then the elastic silica gel is injected to form the soft rubber body 26 covering the insert 11, the retainer 27 and the proximal head portion 25.

S800: and taking the prepared brush head out of the die and the jig 4. After natural cooling, the jig 4 and the die are removed, and the brush head can be obtained.

The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A method for preparing a brush head with a retainer, comprising the steps of:

s2: inserting a plurality of bristle tufts into respective corresponding retention rings on a retainer, creating proximal ends of the bristle tufts, said proximal ends being proximal to said retention rings, and free ends, said free ends being distal from said retention rings; all the proximal head parts are tightly connected or fused into a whole;

s3: applying heat to the proximal ends of a plurality of said bristle tufts at a temperature and distance sufficient to at least partially melt the proximal ends of said bristle tufts to effect heat melting to produce a proximal head; the proximal head adjacent the cage side wall is flush with the cage side wall;

s4: placing the retainer, which is thermally fused to generate the proximal head, into an inner cavity of a jig, wherein the proximal head is higher than the jig; the free ends of the bristle tufts are placed into the inner cavity of the jig, and the side wall of the retainer is higher than the jig;

s8: and taking the prepared brush head out of the die and the jig.

2. The method of manufacturing a brush head with a holder according to claim 1, further comprising:

3. The method of claim 1, wherein a plurality of said proximal heads are flush with a sidewall of said holder.

4. The method for manufacturing a brush head with a holder according to claim 1, wherein in the step S5: a gap is arranged between the inner side wall of the cavity of the die and the outer side wall of the retainer, and the gap is communicated with the cavity channel for injection molding the brush handle.

5. The method for manufacturing a brush head with a holder according to claim 1, wherein in the step S6: the cavity channel for injection molding the brush handle is arranged on the die or the jig.