CN114145560A

CN114145560A - Preparation method of brush head component

Info

Publication number: CN114145560A
Application number: CN202111496459.1A
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: 2022-03-08
Anticipated expiration: 2041-12-08
Also published as: CN114145560B

Abstract

The invention discloses a preparation method of a brush head component, which comprises the following steps: inserting a plurality of bristle tufts into each corresponding jig ring on the jig, creating proximal and free ends of the bristle tufts; applying heat to the proximal end of each bristle tuft to effect heat staking to produce a proximal head; placing a jig with a near-end head generated by hot melting into a mold, so that the free end of the bristle tuft is positioned in the mold, and the whole jig is ensured to be stably fixed on the mold; the brush handle is formed by injection molding of a cavity channel for the injection molded brush handle, the brush handle is provided with an insertion part, and the insertion part is molded above the head of the near end or coats the head of the near end; adjusting the position of the mold to combine the pore channel capable of injecting the soft rubber with the jig, so as to realize injection molding of the soft rubber to form a soft rubber main body, and coating the insertion part and the near-end head of the brush handle with the soft rubber main body, thereby completing preparation of the brush head assembly; and taking the prepared brush head assembly out of the mold and the jig.

Description

Preparation method of brush head component

Technical Field

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

Background

From the first metal bristle technology to the increasing adoption of metal-free bristle technology by businesses today, as the manufacturing process of the brush head develops, the brush heads of both manual and electric toothbrushes include bristles for cleaning teeth, tongue and cheek. In some toothbrushes, the bristles are organized into tufts of bristles contained within retaining rings. The retaining ring is used to secure the bristle tufts within the head and typically has a hollow circular shape with an inner and outer circumference. During manufacture, the bristle tufts 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 head. Thus, the rings and bristle tufts may loosen or become loose within the brush head, and the bristles may not always be positioned at an optimal angle for brushing. As such, for example, under dynamic conditions of motion caused by operation of the power toothbrush, the bristle tuft structure may be subjected to higher stresses under dynamic motion, which may result in separation. In addition, the process of organizing the 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 response to the above-mentioned deficiencies, some prior art techniques provide for the formation of 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 end to produce 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, an elastomer matrix surrounding the brush neck, the plurality of retaining rings, the proximal head portion, wherein the elastomer matrix fills the first and second spaces.

Although the above-mentioned drawbacks mentioned in the first paragraph are solved, the production process is complicated, because in the prior art, the brush head and the brush neck must be separately manufactured, a machine specially used for manufacturing the brush neck and a machine specially used for manufacturing the brush head are required, in the prior art, after the brush neck is manufactured on one machine in the process of manufacturing the brush head assembly, the manufacture of the brush head can be performed on the other machine, because before the manufacture of the brush head is started, the manufactured brush neck needs to be put into a mold for manufacturing the brush head in advance, the manufacture of the brush head and the manufacture of the brush head assembly can be performed, and therefore, the process is complicated.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, it is an object of the present invention to provide a method of making a brushhead assembly which is simple and quick, and which does not result in deformation of the bristles.

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

s1: inserting a plurality of bristle tufts into each corresponding tuft ring on a tuft creating a proximal end of the bristle tufts that is proximal to the tuft ring and a free end that is distal from the tuft ring;

s2: applying heat to the proximal end of each of the bristle tufts at a temperature and distance sufficient to at least partially melt the proximal end of the bristle tufts to effect heat staking to produce a proximal head;

s3: placing the jig with the near-end head produced by hot melting into a mold, so that the free end of the bristle tuft is positioned in the mold, and the whole jig is ensured to be stably fixed on the mold;

s4: forming a brush handle by injection molding through a cavity for the injection molded brush handle, wherein the brush handle is provided with an insertion part which is molded above the near-end head or coats the near-end head;

s5, adjusting the position of the mold to enable a hole channel capable of injecting soft rubber to be combined with the jig, so that injection molding of the soft rubber is realized to form a soft rubber main body, and the soft rubber main body wraps the near-end head and the insertion part of the brush handle, so that the preparation of the brush head assembly is completed;

s6: and taking the prepared brush head assembly out of the mold and the jig.

Further, in the step S2, any two adjacent proximal heads, and each proximal head and the corresponding jig ring are tightly attached to each other.

Further, in step S2, the proximal heads are flush with or higher than the side walls of the jig.

Further, in step S3, a gap is formed between the proximal head and the inner sidewall of the mold.

Further, in the step S3, the proximal head is higher than the mold.

Further, in step S4, the cavity for injection molding of the brush handle is disposed in the mold or the jig.

The improvement of this patent brings the following advantage:

(1) in the prior art, the head and handle must be manufactured separately, using a machine that is dedicated to the manufacture of the handle and a machine that is dedicated to the manufacture of the head. The prior art has to manufacture the brush handle on one machine before the brush head assembly can be manufactured on another machine. The manufacture of the brush head on the handle can be carried out before the manufacture of the brush head is started, because the manufactured handle is required to be put into a mold for manufacturing the brush head in advance. The process is complicated, and the used mechanical equipment and dies are more. The brush head and the brush handle are integrated on a machine to be manufactured, so that the quick integral molding of the brush neck and the brush head is realized. Specifically, the brush hair (bristle cluster) is inserted into a jig, the near-end head is formed by hot melting, then the brush handle is formed by injection molding hard glue, and finally, only the position of a mold needs to be adjusted, and the soft glue 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, and the manufacture of the brush handle is skillfully integrated in the manufacture of the brush head, thereby saving the process flow and time for manufacturing the brush head assembly, optimizing the manufacturing process and greatly improving the manufacturing efficiency.

(2) In the prior art, when the brush handle is injection-molded, overlarge injection-molding pressure acts on the near-end head of the bristle cluster, so that the bristles deform and bend, and the product quality is seriously influenced. And this application supports fixedly to the bristle tuft on the whole through using the tool, when having overcome the brush holder 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.

Drawings

FIG. 1 is a schematic illustration of steps in a method of making a brush head assembly according to an embodiment;

FIG. 2 is a schematic structural diagram of a brush head assembly according to an embodiment;

FIG. 3 is a schematic view of the embodiment showing the bristle tufts being placed in the jig during preparation of the brush head;

FIG. 4 is a schematic view of a state in which a bristle tuft creates a proximal head when preparing a brush head according to an embodiment;

FIG. 5 is a schematic view showing the brush head prepared according to the embodiment after soft glue is injected;

the brush handle 1, the inserting part 11, the brush head 2, the bristle tufts 22, the free end 23, the proximal end 24, the proximal end head 25, the soft rubber main body 26 and the jig 4.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.

As shown in fig. 1 to 5, as one example, a method for preparing a brush head assembly includes steps S100 to S600. The brushhead assembly described herein can be mounted for use on a manual toothbrush or a power toothbrush.

S100: as shown in fig. 3, a plurality of bristle tufts 22 are inserted into each corresponding tool ring on the tool 4, creating free ends 23 and proximal ends 24 of the bristle tufts 22, the proximal ends 24 being proximal to the tool ring and the free ends 23 being distal from the tool ring. The bristle tufts 22 are formed by a plurality of bristle filaments bunched together. The bristle tufts 22 can be of various sizes and shapes with the proximal end 24 embedded within the interior of the brush head assembly to securely hold the bristle tufts 22. The free end 23 of the cleaning brush extends outwards to perform a cleaning function, and the free end 23 can be flush, inclined towards one side or convex in the middle. The jig 4 is provided with a jig ring for inserting the corresponding bristle tufts 22. The fixture 4 is made of a harder material, and the bristle tufts 22 can be fixed before the proximal head 25 is formed by hot melting so as not to be scattered; after heat staking to form the proximal head 25, the fixture may integrally support and secure the proximal head 25 of the bristle tuft 22. In particular the bristle tufts 22, are injection molded with the handle 1, the proximal head 25 of which provides a supporting fixation when subjected to a large injection molding pressure, without causing a forced deformation of the bristle tufts 22.

S200: as shown in fig. 4, heat is applied to the proximal end 24 of each bristle tuft 22 at a temperature and distance sufficient to at least partially melt the proximal end 24 of the bristle tuft, effecting heat staking to produce a proximal head 25. The heat staking may be by direct contact with the proximal ends 24 of the bristle tufts 22 using a heat source or the heat source may be by indirect heating of the air to melt the proximal ends 24. The bristle tufts 22 are more securely retained on the brush head assembly due to the larger diameter of the proximal head portions 25 of the melted bristle tufts, which are formed by the proximal ends 24 of the bristle tufts, relative to the bristle tufts 22. As a more preferable scheme, in order to fix the bristles on the bristle component more firmly, any two adjacent proximal end heads 25 are tightly attached or integrated without generating a first space; and the lower end of each proximal head 25 is tightly attached to the corresponding jig ring, without creating a second space. All proximal heads 25 are flush with or higher than the side walls of the jig 4.

S300: the jig 4, which is hot-melted to produce the proximal head 25, is placed into the mold so that the free ends 23 of the bristle tufts 22 are positioned in the mold, ensuring that the entire jig 4 is stably fixed in the mold. The mould is mainly used for injection moulding of the brush handle 1 and is provided with an inner cavity capable of accommodating the jig 4. When the tool 4, which is hot-melted to produce the proximal head 25, is placed in the mold, the free ends 23 of the bristle tufts 22 are placed with the tool 4 into the interior of the mold. The proximal head 25 of the bristle tuft 22 is exposed and raised above the mold so that the proximal head 25 can be more fully covered by the soft gel during injection molding of the soft gel; in addition, in the horizontal direction, a gap is formed between the near-end head 25 and the inner cavity side wall of the mold, so that when soft rubber is injected, the soft rubber can completely cover the near-end head 25, and the fixing effect of the bristle tufts 22 is enhanced.

S400: the handle 1 is injection molded through a cavity for injection molding the handle 1. referring to fig. 5, the handle 1 has an insert 11, the insert 11 is molded over or covers the proximal head 25. The cavity channel for injection molding of the brush handle 1 can be arranged on a mold or a jig 4; when the injection mold is arranged on the jig 4, the mold is also provided with a corresponding runner for the injection molding brush holder 1. The handle 1 is formed by injecting a hard glue into a mould through a cavity for injection moulding the handle 1 using an injection moulding machine. The inserting part 11 of the brush holder 1 is formed by extending at least one part of one end surface of the brush holder 1 and is inserted into the soft rubber main body 26 of the brush head 2, so that the stress structure at one end of the brush head is improved, and the use experience is improved. Optionally, a certain gap is provided between the insertion portion 11 and the proximal head portion 25 for injecting soft glue, and of course, the insertion portion 11 may also directly cover or wrap the proximal head portion 25 to obtain better hand feeling.

S500: the position of the mould is adjusted, so that the hole channel capable of injecting the soft gum is combined with the jig 4, the injection molding of the soft gum is realized to form a soft gum main body, as shown in fig. 5, the soft gum main body 26 coats the insertion part 11 of the brush handle 1 and the near-end head 25, and the preparation of the brush head assembly is completed. Specifically, the upper half of the mold is taken out and the mold is horizontally rotated by 180 degrees, and the hole channel of the injection molding soft rubber on the injection molding machine is combined with the jig 4 (refer to the manufacturing process of the double-color mold), so that the elastic silica gel is injected to form the soft rubber main body 26 covering the insertion part 11 and the near-end head 25.

S600: and taking the prepared brush head assembly out of the mold and the jig 4. After natural cooling, desorption tool 4 and mould can obtain the brush head subassembly of this application.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A preparation method of a brush head component is characterized by comprising the following steps:

s5: adjusting the position of the mold to enable a pore channel capable of injecting soft rubber to be combined with the jig, so as to realize injection molding of the soft rubber to form a soft rubber main body, and the soft rubber main body coats the near-end head and the insertion part of the brush handle, so that the preparation of the brush head assembly is completed;

s6: and taking the prepared brush head assembly out of the mold and the jig.

2. The method of claim 1, wherein in step S2, any two adjacent proximal heads and each proximal head is tightly attached to the corresponding jig ring.

3. The method as claimed in claim 2, wherein in step S2, the plurality of proximal heads are flush with or higher than the side walls of the jig.

4. The method of claim 1, wherein in step S3, the proximal head portion has a gap with an inner sidewall of the mold.

5. The method of claim 4, wherein in step S3, the proximal head portion is raised above the mold.

6. The method of claim 1, wherein in step S4, the cavity for injection molding the brush handle is disposed in the mold or the fixture.