JPS60163603A - Brush and its production - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to improvements in the handles of various types of handles such as toothbrushes and hairbrushes, and more specifically, to improvements in the handles of various types of handles such as toothbrushes and hairbrushes, and more specifically, to improve the handles of various types of handles such as toothbrushes and hairbrushes, and more specifically, to improve the handles of various types of handles such as toothbrushes and hairbrushes. This invention relates to a nondol with increased crystallinity and a method for producing the same.

[Prior art]

Traditionally, the materials used for nondles for brushes used on a daily basis, such as toothbrushes and hairbrushes, include 1-ethylene, polypropylene, polyamide, acrylonide-1-nor styrene resin (AS), and acrylonide-1-nor butadiene resin. Styrene resin (ABS) and cellulose propionate.

By the way, for example, toothbrushes are sometimes immersed in boiling water to clean and sterilize them, and hair brushes are exposed to high-temperature hot air when using a hair dryer, but conventional non-dryers However, due to its poor heat resistance, it not only tends to be deformed or deteriorated during use, but also has various problems such as hair loss on the brush.

For example, polyethylene terephthalate (PETP) as a raw material synthetic resin has conventionally been made into an amorphous state and molded into bottle containers etc. to take advantage of its transparency, but it is known to have poor heat resistance. Although acrylonitrile styrene resin (AS) and acrylonitrile butadiene styrene resin (ABS) have no problem with toothbrushing resistance, they may become deformed or deteriorated when disinfected with boiling water or boiling, and the strength of flocking in particular decreases. Resin (PP) and cellulose propionate resin (CP) have good toothbrushing resistance and elasticity, but they have drawbacks such as deformation when sterilized with boiling water or boiling, and polycarbonate resin has no problem with heat resistance, but flocking Currently, they are not used alone because they tend to crack when they come into contact with toothpaste or toothpaste (all of these materials have some problems, such as the need to mix ABS resin with them).

In addition, the brushes that are used on a daily basis, such as those mentioned above, have conventionally been printed with labels, transfer printing, hot stamping, etc. to enhance their aesthetic appeal, as well as with multicolor molding and insert molding. Special molding processes such as There are problems involved.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks of the conventional products and provide a synthetic resin noodle with excellent heat resistance and a method for manufacturing the same.

It is also an object of the present invention to provide a handle with a novel appearance and a method of manufacturing the same using a very simple process.

[Structure of the invention]

The present invention provides a brush consisting of a brush portion and a nondle made of a synthetic resin made of a crystalline polymer, by increasing the crystallinity of at least a portion of the nondle, thereby improving thermal and mechanical properties. This brush is characterized by a change in its color appearance.

The present invention also provides a method for manufacturing a nondle for a brush by injection molding using a synthetic resin made of a crystalline polymer, in which at least a portion of the nondle is subjected to a heat treatment in the injection molding step or a subsequent step. This is a method for manufacturing a nondle for brushes, which is characterized by:

In the present invention, as the molding material for the nondol, any synthetic resin made of conventionally known crystalline polymers such as those described above can be used, but polyethylene terephthalate resin is particularly preferred, and polyethylene terephthalate resin and other crystalline polymers are particularly preferred. It is also effective to use a polymer blend with a synthetic resin made of a crystalline polymer, but if desired, it is also possible to use a polymer blend of these crystalline synthetic resins with known amorphous synthetic resins.

If the main purpose is to increase heat resistance, the area to increase the degree of crystallinity may be increased to cover the entire handle, but in order to bring out novelty or novelty in terms of color, it may be necessary to increase the degree of crystallinity only partially. It is necessary to increase the degree of

In addition, when using polyethylene terephthalate resin, which improves heat resistance as the degree of crystallinity increases, it also causes a decrease in mechanical properties, which may lead to problems such as breakage of the gripping part of the nondle. It is also effective to crystallize only the flocked portion by leaving the resin in an amorphous state without crystallizing it and taking advantage of the properties (elasticity, etc.) of the amorphous portion of the resin.

In the present invention, the meaning of the phrase "increases crystallinity" is as follows. In other words, when injection molding a toothbrush handle using LD' polyethylene terephthalate resin as a molding material, the mold temperature is usually kept at about 1
Molding is performed at a temperature of 0 to 30°C to obtain a molded product that is almost completely transparent, but in the present invention, the mold is actively heated to, for example, around 170°C, so that the increased crystallization area is removed. To the extent that it changes to a milky white color (however, when no coloring agent such as a pigment is added), in other words, the crystallinity of the conventional method is less than about 50 cm and the density is less than about 1.40 cm.
This means increasing the crystallinity of the crystallization-increasing portion to about 55-100% and the density to about 1.40-1.44. In short, the above phrase means actively increasing the crystallinity of the crystalline polymer material, and specific examples thereof include the method of heating and maintaining the mold of an injection molding machine as described above; After molding, it is immersed in a heating medium such as water, liquid paraffin, or quenching oil heated to a predetermined temperature for a predetermined time, or
Alternatively, a method of annealing (preferably about 170° C. in the case of PETP) by leaving it in an atmosphere of air, nitrogen gas, etc. in a constant temperature apparatus is possible.

The degree of increase in crystallinity, that is, the degree of crystallinity of the handle portion, varies depending on the purpose of increasing crystallinity, but it has been determined in advance by experiments that the density, heat resistance, deformation/alteration resistance, hair loss resistance, etc. of the heat-treated material are determined. It is important to examine and determine the relationship between the two, and if the crystallinity is increased unnecessarily, it will become brittle, which can lead to conspicuous damage.

In addition, when changing the color appearance, it is generally preferable to increase the degree of crystallinity, which has the effect of making the contrast with the transparent part (amorphous part) more noticeable. However, consideration must be given to the above-mentioned problems.

In the case of a change in appearance in terms of color, the degree of crystallinity is partially increased, but specifically, for example, by integral injection molding, the surface side of the nondle is made transparent and the inside is crystallized to give it a milky white color. , one side of the surface is cooled by thermal control,
It is possible to make only one side milky white by heating the other side, and it is also possible to make various patterns such as a striped pattern or a striped pattern in which the crystallized portion is shifted to one side.

In addition, pigments and other conventionally known additives may be added in a molding process such as injection molding. Moreover, the various heat treatments described above can also be applied to tube-shaped molded products, sheet-shaped molded products, and the like.

〔Example〕

Next, the present invention will be explained in more detail based on examples.

Example 1; Toothbrushes made of nondles of the same shape and size made of various synthetic resin materials obtained through conventional manufacturing processes, and two types of flat wires of different lengths were successively replaced and flocked under the same conditions. It was prepared and used as a sample. Among these, polyethylene terephthalate resin was prepared using a non-crystallized nondol molded under normal conditions and a nondol crystallized for the entire nondol using the method of the present invention. was immersed in boiling water at 100° C. for 3 minutes, then returned to room temperature, and the amount of thermal deformation and flocking strength were measured to compare heat resistance.

The results are shown in Table 1. Note that a Tensilon tensile tester was used to measure the flocking strength.

Next, for each toothbrush sample prepared separately from the above test, the side opposite to the flocked part was fixed, and 110
A load of 400 g was applied to a position tm apart, and the amount of deformation strain, that is, the elasticity of the handle was measured.

The results are shown in Table 2.

Table 1 Heat resistance data Table 2 Elasticity data Example 2: Teeth sides made of various synthetic resin molding materials obtained through manufacturing processes using conventional methods, and two types of polyethylene with and without crystallization obtained using the method of the present invention. A terephthalate drawing brush was prepared and used as a sample.

Note that all samples were molded into the same shape and dimensions.

Using a Tensilon compression tester, the gripping part of the toothbrush nondle was fixed and the flocked part was pushed, and the load when it deformed or broke was measured, and the neck breakage safety was compared. The results are shown in Table 3.

Table 3: Neck breakage safety data Example 3 (Toothed side handle with an unusual appearance); Toothed side handle made using a regular injection molding machine using polyethylene terephthalate resin for molding transparent bottle containers. Two types of tooth side products were created by molding.

These are shown in FIGS. 1 and 2. In the case shown in Figure 1, the mold is heated to 50℃ using a mold temperature controller, and the injection molding cycle is repeated for one cycle.
In the case of FIG. 2, the mold was similarly heated to 70° C. and the cycle was set for 1 minute and 20 seconds to further increase the degree of crystallinity compared to the case of FIG. 1. In these drawings, 1 is a handle, 2 is a grasping part, 3 is a flocked part, 4 is a brush, the outside 5 of the handle 1 is in an amorphous state (transparent), and the inside 6 is
crystallized (milky white, but in the drawing it is in a dotted pattern)
This is what I did. As seen in the drawing, the contrast between the transparent and opaque parts gives it an unusual appearance, and the heat resistance and elasticity can be adjusted in a well-balanced manner by increasing or decreasing the crystallized part in the grasping part 2. It has become possible.

Example 4: Using the same polyethylene terephthalate resin as that used in Example 3, an amorphous (transparent) handle was molded using a conventional injection molding machine using a conventional method.
This was treated with flocking to create a toothbrush. Only the flocked portion of this toothbrush was brought into contact with heated air in a thermostat to crystallize it. The resultant product is shown in FIG. 3, in which the entire flocked portion 6 is crystallized and becomes milky white.

In addition, separately heat the part of the mold that corresponds to the flocked part,
When the portion corresponding to the grasping portion of the handle was cooled and molded in the conventional manner, a handle having an appearance similar to that shown in FIG. 3 was obtained.

〔Effect of the invention〕

As described above, according to the handle for toothbrushes, etc. of the present invention, there is no fear that the handle will deform or the brush will come off even if exposed to hot water, hot air, etc., and it has excellent heat resistance such as heat deformation and flocking strength. It is possible to obtain brushes with significantly improved thermal and mechanical properties, such as improved thermal properties and significantly reduced troubles such as deformation and breakage during use. Also,
According to the method of the present invention, it is possible to economically produce the above-mentioned high-quality handles using a simple device and a simple process, and production management can be significantly streamlined, and by specifying molding conditions, the appearance can be improved. It is possible to create unique designs, and it is possible to obtain brushes with excellent design, as well as to have both heat resistance and elasticity, or to add heat resistance to only the parts that are particularly required. It brings great benefits.

[Brief explanation of the drawing]

FIG. 1 is a plan view of one embodiment of the present invention, FIG. 2 is a plan view of another embodiment, and FIG. 3 is a plan view of still another embodiment. 1... Handle, 2... Grasping part, 3... Flocking part, 4... Brush, 5... Outside, 6... Inside, 7...
·hole. Patent Applicant Lion Co., Ltd. Representative Patent Attorney Masashi Takagi 1) Twisting Takashi Maruyama Procedural Amendment TL! April 5, 1985, Mr. Kazuo Wakasugi, Director-General of the Agency■, Minor Incident Indication Special Request No. 18187 2 of 1982,
Title of the invention Brush and its manufacturing method 3, Relationship with the person making the amendment Jl, f'l I Patent applicant A1' Co., Ltd. 4 Shirogawa 6 Number of inventions increased by sleeve correction Amended specification 1 Name of the invention Brush and method for manufacturing the same 2 Claim 1 Synthesis consisting of a brush part and a crystalline polymer 2. A brush according to claim 1, characterized in that the synthetic resin is on polyethylene terephthalate. 3. Crystallinity. In a method of manufacturing a handle for a brush brush by injection molding using a synthetic resin made of a polymer,
A method for manufacturing a brush handle, characterized in that the flocked portion of the handle is subjected to heat treatment in the injection molding step or a subsequent step. 4. The manufacturing method according to claim 3, characterized in that polyethylene terephthalate resin is used as the synthetic resin. 5. The manufacturing method according to item 5, wherein the heat treatment is performed in the injection molding step by heating a part of a mold of an injection molding machine. 6. A method of poetry, characterized in that the heat treatment is performed after the injection molding step, and is performed by heat treating a molded product. 3. Detailed Description of the Invention [Field of Industrial Application] The present invention aims to improve the handles of various brushes such as toothbrushes and hairbrushes, and more specifically, by using a synthetic resin made of a crystalline polymer, at least the flocked portions are made of crystals. The present invention relates to a brush with a handle that has an increased degree of oxidation and improved thermal and mechanical properties, and a method for manufacturing the same. [Prior Art] Conventionally, the handles of toothbrushes, hairbrushes, and other brushes used on a daily basis have been made of polyethylene, polypropylene, polyamide, acrylonitrile/styrene resin (A
S), acrylonitrile fist butadiene styrene resin (
ABS), cellulose propionate resin (CP
, ) and other synthetic resins are used. By the way, for example, toothbrushes must be immersed in boiling water to clean and sterilize them, and hair brushes are exposed to high-temperature hot air when using a hair dryer, but conventional methods Because the brush has poor heat resistance, it not only tends to deform or change in quality during use, but also has various problems such as hair loss on the brush. For example, polyethylene terephthalate (PETP), which is used as a raw material synthetic resin, has traditionally been made into an amorphous state and molded into bottle containers that take advantage of its transparency, but it is known to have poor heat resistance. - Although styrene resin (AS) and acrylonitrile butadiene styrene resin (ABS) have no problem with toothbrushing resistance, they may deform or change in quality when disinfected with boiling water or boiling.
In particular, the flocking strength decreases, and polypropylene resin (pp.
) and cellulose propionate resin (cp) have good toothbrushing resistance and elasticity, but have drawbacks such as deformation when disinfected with boiling water or boiling, while polycarbonate resin has no problem with heat resistance but is difficult to use during hair transplantation or toothbrushing. All of these raw materials have more or less problems, such as the fact that they tend to crack when brought into contact, so they are not used alone at present, and they must be mixed with ABS resin. [Object of the invention] The present invention solves the above-mentioned drawbacks of the conventional ones, and improves heat resistance and
The object of the present invention is to provide a brush with a synthetic resin needle having excellent mechanical properties and a method for manufacturing the same. [Structure of the Invention] The present invention provides a brush comprising a brush portion and a handle made of paulownia made of a synthetic resin made of a crystalline polymer, by increasing the degree of crystallinity of the flocked portion of the brush. This is a brush characterized by improved thermal and mechanical properties. Still, the present invention provides a method for manufacturing a brush handle by injection molding using a synthetic resin made of a crystalline polymer, which includes heating the flocked portion of the handle in the injection molding step or a subsequent step. A method for manufacturing a brush handle, characterized by: In the present invention, as the molding material for the handle, any of the conventionally known synthetic resins made of crystalline polymers as described above may be employed, but polyethylene terephthalate resin is particularly preferred, and polyethylene terephthalate resin and other crystalline polymers are particularly preferred. It is also effective to use a polymer blend with a synthetic resin made of a crystalline polymer, but if desired, it is also possible to use a polymer blend of these crystalline synthetic resins with known amorphous synthetic resins. In the present invention, the meaning of the phrase "increase crystallinity" is as follows. For example, when injection molding a toothbrush handle using polyethylene terephthalate resin as a molding material, the mold is actively heated to about 130°C, and the area with increased crystallinity becomes milky white (however, colorants such as pigments In other words, it means actively increasing the crystallinity of the crystalline polymer material. The conventional one has a crystallinity of 1 and a density of about 1.34 r/m.
In contrast, in the present invention, the density of the increased crystallinity portion is approximately 1.355 to 1.44 μd, that is, the crystallinity of this portion is approximately 15 μd or more, preferably 15 to 60 μd, and 15 μd or more. -40% is most preferred. In the present invention, specific methods for increasing the degree of crystallinity include a method of heating and maintaining the mold of an injection molding machine as described above, a method of heating the mold of an injection molding machine as described above, a method of heating the mold of an injection molding machine after molding, and a heating medium such as liquid paraffin or quenching oil heated to a predetermined temperature. Heat treatment (P
In the case of ETP, the temperature is preferably about 170°C). In the case of PETP, the heating conditions for achieving a crystallinity of 20% and a density of 1.36 μd are, for example, 130°C x
About 8 minutes, 150°C x about 6 minutes, 170°C x about 4 minutes. It is important to determine the degree of increase in crystallinity, that is, the crystallinity of the flocked part, by examining the relationship between the density of the heat-treated material and the strength of the flocked hair in advance through experiments.If the crystallinity is increased unnecessarily, it will become brittle. On the contrary, there are problems that are more harmful. It is also a good idea to increase the crystallinity only in the flocked part and leave the grasping part amorphous to take advantage of the properties (elasticity, etc.) of the amorphous part of the resin, but this will be explained in the example below. As shown, it is also effective to crystallize along the entire axial direction of the bundle. In addition, pigments and other conventionally known additives may be added in a molding process such as injection molding. Further, the above-mentioned various heat treatments can also be applied to a cheap molded product, a sheet-like molded product, or the like. [Examples] Next, the present invention will be explained in more detail based on Examples. Example 1: Toothbrushes were made using handles of the same shape and size made of various synthetic resin materials obtained through conventional manufacturing processes, and two types of flat wires of different lengths were successively replaced and flocked under the same conditions. It was prepared and used as a sample. Among these, polyethylene terephthalate resin was prepared using an uncrystallized handle molded under normal conditions and a handle that was entirely crystallized by the method of the present invention. The flocked portion of the sample was immersed in boiling water at 100° C. for 3 minutes, then returned to room temperature, and the amount of thermal deformation and flocking strength were measured and the heat resistance was compared. The toothbrush according to the present invention is as shown in Fig. 1, and 1 is a handle, 2 is a grasping part, 3 is a flocked part, 4 is a brush, and 5 is a neck part. It has a scattered dot pattern). Note that 6 is a hole. The measurement results are shown in Table 1, and a Tensilon tensile tester was used to measure the flocking strength. Next, for each sample of the toothbrush prepared separately from the above test, the side opposite to the flocked part was fixed, and 110 m from the fixed part was fixed.
A load of 400 t was applied to a position separated by m, and the amount of deformation strain, that is, the elasticity of the handle was measured. The results are shown in Table 2. Table 2 Elasticity Data Example 2: Toothbrushes made of various synthetic resin molding materials obtained through conventional manufacturing processes and two types of polyethylene terephthalate brushes with and without crystallization manufactured by the method of the present invention. It was prepared and used as a sample. Note that all samples were molded into the same shape and dimensions. Using a Tensilon compression tester, the gripping part of the toothbrush handle was fixed and the flocked part was pushed, the load when it deformed or broke was measured, and the neck breakage safety was compared. The appearance of the toothbrush produced by the method of the present invention (the entire flocked part 3 and part of the neck part 5 were crystallized) is shown in FIG. 2, and the measurement results are shown in Table 3. [Effects of the Invention] As stated above, with the handle for toothbrushes, etc. of the present invention, there is no fear that the brush will come off even when exposed to hot water, hot air, etc., and it has good heat resistance such as flocking strength. However, it can be made into brushes whose thermal and mechanical properties are significantly similar to that of china clay. Furthermore, according to the method of the present invention, it is possible to economically produce the above-mentioned high-quality nondol using simple equipment and a simple process, and production management can be significantly streamlined, resulting in great practical benefits. It brings about. 4. Brief Description of the Drawings FIG. 1 is a plan view of one embodiment of the present invention, and FIG. 2 is a plan view of another embodiment. 1... Handle, 2... Grasping part, 3... Flocking part,
4...Brush, 5...Neck, 6...Hole. Patent applicant Masayuki Takagi, patent attorney representing Lion Co., Ltd.

Claims (1)

[Scope of Claims] 1. In a brush consisting of a brush part and a handle made of a synthetic resin made of a crystalline polymer, heat is generated by increasing the crystallinity of at least a portion of the brush. A brush characterized by having changed physical/mechanical properties and/or color appearance. 2. The brush according to claim 1, wherein the synthetic resin is a polyethylene terephthalate resin, and the crystallinity of the increased crystallinity portion is 55% or more. 3. The brush according to claim 1 or 2, wherein the nondle comprises a transparent part and a part made opaque by increasing the degree of crystallinity. 4. The brush according to claim 3, wherein the grasping portion of the handle is transparent, and the flocked portion is made opaque by increasing its crystallinity. 5. A method for manufacturing a brush handle by injection molding using a synthetic resin made of a crystalline polymer,
A method for manufacturing a brush handle, characterized in that at least a portion of the handle is subjected to a heat treatment in the injection molding step or a subsequent step. 6. The manufacturing method according to claim 5, characterized in that polyethylene terephthalate resin is used as the synthetic resin. 7. The heat treatment is carried out in the injection molding step, and is carried out by heating at least a part of the mold of the injection molding machine, or The manufacturing method according to item 6. 8. The heat treatment is performed after the injection molding step, and is performed by annealing the molded product. Production method. 9. The manufacturing method according to claim 5, 6, 7, or 8, wherein the heat treatment is performed only on the flocking stand of the nondle.