JPH0939467A - Shaft element having elastic embossed patterns - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the anti-slip effect of the grip part of a shaft element by forming embossed patterns having specific rubber hardness and specific thickness to at least the grip part of the shaft element by screen printing. SOLUTION: Embossed patterns 2 with rubber hardness of 60-90 and a thickness of 30-200μm are formed to at least the grip part of the shaft element 1 of a writing utensil, a cosmetic utensile or an electronic input pen by screen printing. The surface roughness of the embossed patterns 2 is set to 0.1-3μm and a urethane resin is used as the material quality of the embossed patterns 2. As the material quality of the shaft element 1, a thermoplastic resin such as ABS, PET, POM, nylon or polycarbonate is used and a metal such as aluminum, stainless steel or brass can be also used. Hydrophilic treatment is preliminarily applied to the surface of the shaft element 1 formed of the thermoplastic resin by flame treatment, plasma treatment or corona discharge treatment in order to stably and closely bond the anti-slip patterns 2.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a writing instrument, a cosmetic instrument,
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft body having an elastic concave / convex pattern for the purpose of preventing slippage in at least a grip portion of a shaft body such as an electronic input pen.

[0002]

2. Description of the Related Art Conventionally, in order to impart a non-slip function to a grip portion of a shaft, a method of mechanically forming a groove such as a knurl, a method of coating a resin such as silicon which is hard to slip, or A method has been proposed in which a separate member is made of silicone rubber or various elastomers and mounted on the shaft grip portion. The knurling method and the method of mounting another member have already been put to practical use, but the knurling method merely forms a groove on the surface of the shaft body and has no characteristic such as elasticity. There was also a problem that the degree of freedom in design was low. Furthermore, as for the method of attaching another member, the cost is high with a low-priced writing instrument, and there has been a demand for a method that can be accommodated at a low price.

Recently, elastic resin materials and paints have been developed. For example, soft vinyl chloride is extruded and used for a shaft body, or an elastic paint is applied to the whole shaft body or a grip portion to slip. Although methods of giving a stop have been proposed, these methods have a room for improvement because they tend to become slippery due to abrasion of the surface in actual use because the surface is smooth.

Further, as a method of imparting a non-slip function to the grip portion of the shaft body, pattern formation by a screen printing method has been proposed. This method has advantages over the coating method, the transfer method, etc. in that the processing is simple, the pattern shape, and the printing thickness can be arbitrarily selected. That is, in the coating method, it is impossible to form a pattern unless masking is used,
There is a problem that the number of coatings increases when thickening the film to obtain a soft feeling, and the transfer method has a structure of the transfer foil and the resin material for forming the pattern. The thickness tends to be thin, and there is a problem in terms of wear resistance.

By the way, a coating film formed for the purpose of preventing slippage is required to have elasticity and high surface friction resistance. Further, since the anti-slip function is added, if the pattern is peeled off or damaged in actual use, the anti-slip function will be deteriorated. Further, in order to add a non-slip feeling, it is difficult only by elasticity and frictional resistance, and an appropriate feeling of unevenness is required. Therefore, the non-slip pattern
It is essential that the resin has elasticity and unevenness, and is formed of a material having good adhesion to the base material. The screen ink for forming this also needs to have a material and composition capable of obtaining a coating film having high elasticity and adhesiveness. However, when an anti-slip pattern is to be formed on a resin base material, an ink and a treatment method satisfying both of the problems that elasticity is lost when importance is attached to adhesion and that adhesion is not obtained when importance is attached to elasticity are available The current situation is that there are none. Further, when forming a non-slip pattern on a resin substrate, the selection of the screen ink is an important factor because the upper limit of the heating temperature in the process is limited and the pretreatment method and conditions are limited. Become.

[0006]

However, since the conventional screen ink is intended for decoration or name insertion, the coating film is hard or the coating film thickness is small (2 to 2).
(10 μm) There was a problem that a non-slip feeling could not be obtained or the friction coefficient was small and slipping occurred.

[0007]

In view of these problems, the present invention has completed the present invention as a result of earnest research on a pattern having a slipping function, and has completed the present invention. , A rubber body having a rubber hardness of 60 to 90 and a thickness of 30 to 200 μm, the shaft body having an elastic concavo-convex pattern formed by screen printing is defined as the first gist, and the first gist is the first gist. In the second aspect, a shaft body having an elastic concavo-convex pattern in which the surface roughness of the concavo-convex pattern is 0.1 µm to 3 µm and the concavo-convex pattern material is made of urethane resin is a second gist.

The present invention will be described in detail below with reference to the drawings. FIG. 1 is a cross-sectional view of a non-slip printing having elasticity formed on a substrate. Reference numeral 1 is a shaft, and 2 is a concavo-convex pattern. Furthermore, it is shown that the surface of the uneven pattern is rough. The shaft material of 1 is ABS, AS,
Thermoplastic resins such as PET, POM, PP, PE, nylon and polycarbonate are used, and aluminum,
Metals such as stainless steel and brass can also be used. In the case of a thermoplastic resin, it may be colored with a pigment or dye, or may be transparent. In the case of a shaft made of metal, it may be colored in advance by painting, plating, transfer printing, or the like, or a pattern may be formed.

Further, the surface of the shaft body made of a thermoplastic resin is previously subjected to hydrophilic treatment by frame treatment, plasma treatment or corona discharge treatment in order to bring the non-slip pattern into close contact with the surface. It may be.

The concavo-convex pattern 2 is a non-slip printing portion, and has a rubber hardness of 60 to 90 and a printing thickness of 30 to 20.
0 μm. When the rubber hardness is less than 60, the anti-slip pattern is easily peeled off due to the deformation of the film, and when it exceeds 90, the uneven portion becomes hard and slippery occurs. Further, when the printing thickness is less than 30 μm, the grip of the palm of the finger is reduced and a non-slip feeling is not obtained, and when it exceeds 200 μm, it becomes difficult to maintain the pattern shape and there is a problem in appearance such as foaming. Productivity deteriorates because dots are more likely to occur, skill required for printing is required, and it takes a long time to cure the coating film.

The concavo-convex pattern formed on the grip portion of the shaft according to the present invention is formed by the screen printing method.
The screen plate to be used may be one prepared by a conventional sales process using commercially available sales materials. The emulsion is formed by the intuition method or the emulsion method. The printing thickness can be controlled by appropriately selecting the emulsion thickness and the screen mesh. In particular, the screen mesh is preferably 70 to 150 mesh. If it is less than 70 mesh, the ink tends to drip from the plate, and external problems such as bleeding are likely to occur, and if it exceeds 150 mesh, the ink ejection amount is reduced and it may be difficult to obtain a predetermined print thickness. However, in order to solve this problem, it is necessary to thicken the emulsion, which causes problems such as a problem of plate durability and an increase in plate making cost.

A commercially available squeegee may be used. The material of the squeegee can be selected from various materials, but is made of urethane, and the rubber hardness is preferably 60 to 90. If it is less than 60, the printing pattern may become unclear, and if it exceeds 90, the pattern may be easily crushed and the desired printing thickness may not be obtained.

Next, the material of the uneven pattern will be described. As the resin having elasticity, there are silicone resin, various elastomers, urethane resins and the like. However, the silicone resin has a low tear strength, and even if it is made into a screen ink, it cannot be used due to its poor adhesion to the substrate. Further, various elastomers have a problem that it is difficult to make a screen ink and stable printing cannot be performed even if made into ink. Therefore, in the present invention, a urethane resin that is in close contact with the substrate, is easy to form a screen ink, and has excellent printability is particularly preferable. This urethane resin has a rubber hardness of 60 to
90 is good. The urethane resin is a mixture of polyester polyol and polyisocyanate. Particularly, as the urethane resin from which a rubber elastic body is obtained, hexamethylene diisocyanate (HMDI) as polyester polyol and polyisocyanate is used. It is preferable that the organic polyisocyanate used as a raw material is blended. However, since this resin alone has low adhesion to the substrate, it is preferable to add and mix polyester polyol, acrylic polyol, and polyurethane polyol. The amount of addition
10 to 90% by weight is preferred. The reason is 10% by weight
If it is less than 90% by weight, sufficient adhesion cannot be obtained, and if it exceeds 90% by weight, the coating film becomes hard and rubber elasticity may not be obtained.

Next, the surface roughness of the uneven surface will be described. The surface roughness is preferably 0.1 μm to 3 μm, and is 0.1
If it is less than μm, it becomes slippery, and if it exceeds 3 μm, the surface is too rough and the appearance design is deteriorated. As a method of forming this roughness, nylon, polyethylene, polypropylene, polystyrene, acryl, resin powder such as urethane in a screen ink formed of a urethane resin or fine particles obtained by crushing cowhide or silica, alumina, titanium oxide, It may be filled with an inorganic powder such as zirconia oxide, and the concentration thereof may be 2 to 50% by weight based on the solid content of the screen ink resin. The particle size may be about 1 to 50 μm, and the particle shape is amorphous, flaky, spherical, hollow,
It may be fibrous. In particular, the amorphous silica powder has little effect on the color tone of the uneven pattern and can effectively form fine unevenness on the surface of the uneven pattern, but the mechanical strength of the silica powder itself is low. In actual use, since fine irregularities on the surface of the irregular pattern are worn and become slippery, it is preferable to use silica powder having high mechanical strength. As a measure of mechanical strength, it is particularly preferable that the silica powder has a pore size of less than 12 nm and a pore volume of less than 1.6 ml / g. Further, one kind or a mixture of two or more kinds of these powders may be filled in the ink.

[0015]

The rubber hardness is 60 to 60 at least in the grip portion of the shaft body.
According to the present invention, which is composed of a shaft body having an elastic concavo-convex pattern formed by screen printing, a concavo-convex pattern having a thickness of 90 to 90 μm and a thickness of 30 to 200 μm is used. Furthermore, since the surface of the uneven pattern has minute unevenness, it has a moderate elasticity and is not slippery when gripped, and can be used for shafts such as writing instruments, makeup tools, and electronic input pens. , It is possible to further enhance the value of the product.

[0016]

EXAMPLES Next, the shaft body of the present invention will be described based on examples. Example 1 Transparent AS shaft body (outer diameter 8 mm, inner diameter 7.
(4 mm, length 80 mm) was flamed with a gas burner for 1 to 2 seconds. Screen printing is screen 80
Using a plate prepared under the conditions of mesh and emulsion thickness of 40 μm, the pattern has a width of 1 mm and a length of 6 mm, and the pattern interval with respect to the axial direction is 1.5 mm.
The distance between the screens was set to 2.3 mm, and they were arranged on the screen plate so that a pattern could be formed in 30 mm in the axial longitudinal direction of the grip portion of the shaft body. The printing was performed with a rotary screen printing machine (SK350, manufactured by Shinei Kogyo Co., Ltd.).
In addition, the screen ink is made of an elastic urethane resin (Rafel # 200 manufactured by Fujikura Kasei Co., Ltd.) and acrylic polyol (Takeda Pharmaceutical Co., Ltd. UA-90) for enhancing the adhesiveness.
2) 10 parts, carbon black (pigment) 8% by weight relative to the resin solid content, 3 μm of amorphous silica powder (Silicia 256 manufactured by Fuji Silysia Chemical Ltd.) relative to the resin solid content 15 It was prepared by filling it in a weight percentage and dispersing it with three rolls. The prepared screen ink is mixed with a curing agent for elastic urethane resin and a curing agent for acrylic polyol (D-170N manufactured by Takeda Yakuhin Kogyo Co., Ltd.), printed on the grip portion of the AS shaft, and dried at 80 ° C. for 30 minutes. By doing so, a pattern having black elasticity was formed.

Example 2 A transparent ABS shaft body (outer diameter 8)
mm, inner diameter 7.4 mm, length 80 mm) was processed for 5 seconds by the plasma processing apparatus. For the screen printing, a plate made under the conditions of screen mesh 150 mesh and emulsion thickness 80 μm was used. The pattern had a width of 1 mm and a length of 6 mm, and the pattern interval in the axial direction was 1.5 mm. The distance between the patterns in the lateral direction of the shaft was set to 2.3 mm, and the pattern was arranged on the screen plate so that the pattern could be formed in a length of 30 mm in the longitudinal direction of the grip portion of the shaft body. The printing was performed with a rotary screen printing machine (SK350, manufactured by Shinei Kogyo Co., Ltd.). Also, the screen ink is 6 μm in the elastic urethane resin paint black (V-7X-6242 manufactured by Nagashima Paint Co., Ltd.).
It was prepared by filling amorphous silica powder of m (Sylysia 770 manufactured by Fuji Silysia Chemical Ltd.) in an amount of 10% by weight with respect to the resin solid content, and dispersing with 3 rolls. The prepared screen ink was mixed with a curing agent for elastic urethane resin, printed on the grip portion of the ABS shaft body, and dried at 80 ° C. for 30 minutes to form a pattern having black elasticity.

Example 3 A brass press shaft body (outer diameter 8 m)
m, length 80 mm) commercial acrylic paint (MG100
0 black, manufactured by Kansai Paint Co., Ltd. was applied and dried at 130 ° C. for 5 minutes. For the screen printing, a plate made under the conditions of screen mesh 100 mesh and emulsion thickness 50 μm was used. The pattern had a width of 1 mm and a length of 6 mm, and the interval between the patterns in the axial direction was 1.5 mm. The distance between the patterns in the lateral direction of the shaft was set to 2.3 mm, and the pattern was arranged on the screen plate so that the pattern could be formed in a length of 30 mm in the longitudinal direction of the grip portion of the shaft body. The printing was performed with a rotary screen printing machine (SK350, manufactured by Shinei Kogyo Co., Ltd.). Screen ink is 9μm in elastic urethane resin paint black (Dainichi Seika Kogyo Co., Ltd. die plastic coat software).
15% by weight of the amorphous leather powder (CX260-1 of Showa Denko KK) with respect to the resin solid content was filled and dispersed by three rolls. The prepared screen ink was mixed with a curing agent for elastic urethane resin, printed on the grip of the brass shaft, and dried at 150 ° C. for 30 minutes to form a pattern having black elasticity.

<Embodiment 4> A brass press shaft body (outer diameter: 8 m)
m, length 80 mm) commercial acrylic paint (MG100
0 black, manufactured by Kansai Paint Co., Ltd. was applied and dried at 130 ° C. for 5 minutes. For the screen printing, a plate made under the conditions of screen mesh 100 mesh and emulsion thickness 50 μm was used. The pattern had a width of 1 mm and a length of 6 mm, and the interval between the patterns in the axial direction was 1.5 mm. The distance between the patterns in the lateral direction of the shaft was set to 2.3 mm, and the pattern was arranged on the screen plate so that the pattern could be formed in a length of 30 mm in the longitudinal direction of the grip portion of the shaft body. The printing was performed with a rotary screen printing machine (SK350, manufactured by Shinei Kogyo Co., Ltd.). Screen ink is elastic urethane resin paint black (GM-808C manufactured by Honey Chemical Co., Ltd.) and 10 μm acrylic beads (MR1-10HG manufactured by Soken Chemical Industry Co., Ltd.).
Was prepared by filling 30% by weight with respect to the resin solid content and dispersing with 3 rolls. The prepared screen ink was mixed with a curing agent for elastic urethane resin, printed on the grip of the brass shaft, and dried at 150 ° C. for 30 minutes to form a pattern having black elasticity.

Comparative Example 1 AS injection-molded into a cylindrical shape
Printed using axes. Printing is SK manufactured by Shinei Kogyo Co., Ltd.
This was done using 350. As the screen plate, a screen plate made under the conditions of a screen mesh of 300 mesh and an emulsion thickness of 5 μm was used. The pattern was the same as the pattern used in the examples. As the ink, a commercially available NAP color gray color (two-component urethane ink manufactured by Nagase Screen Printing Laboratory Co., Ltd.) was used. Drying was performed at 80 ° C. for 30 minutes. The formed pattern had a print thickness of 8 μm.

Comparative Example 2 AS injection-molded into a cylindrical shape
Printed using axes. Printing is SK manufactured by Shinei Kogyo Co., Ltd.
This was done using 350. As the screen plate, a screen plate made under the conditions of a screen mesh of 200 mesh and an emulsion thickness of 10 μm was used. The pattern was the same as the pattern used in the examples. The ink is a commercially available ink (cericol PP
G, manufactured by Teikoku Ink Co., Ltd. was used. Drying at 80 ℃,
It was carried out under the condition of 30 minutes. The formed pattern had a print thickness of 20 μm.

Comparative Example 3 AS injection-molded into a cylindrical shape
Painted using a shaft. The coating was performed using a spray gun (W70 manufactured by Iwata Coating Machine Industry Co., Ltd.). As the paint, Matiro black (rubber hardness 80, manufactured by Idemitsu Petrochemical Co., Ltd.) was used. The masking was performed several times in the radial direction of the shaft using a thin masking tape. Drying was performed at 90 ° C. for 20 minutes. The formed pattern was in a state where knurls were formed in the radial direction of the shaft and the coating film thickness was 20 μm.
Met.

With respect to the shaft bodies obtained in Examples and Comparative Examples,
A soft feeling, a non-slip feeling, a cross-cut test, an artificial oil test, and a skin abrasion test were performed. The test method is as shown in Table 1,
The results are shown in Table 2.

[0024]

[Table 1]

[0025]

[Table 2]

[0026]

As is apparent from Table 2, according to the present invention, a suitable elasticity is obtained, a good non-slip feeling is obtained when grasped, and further, peeling, oil resistance and abrasion resistance are obtained. It is also possible to obtain an excellent coating film.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a shaft body of the present invention.

FIG. 2 is an enlarged schematic view of a concavo-convex portion of the shaft body of the present invention.

[Explanation of symbols]

 1 Shaft 2 Concavo-convex pattern

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G06F 3/03 310 G06F 3/03 310E

Claims (2)

[Claims] 1. An elastic uneven pattern formed by screen printing an uneven pattern having a rubber hardness of 60 to 90 and a thickness of 30 to 200 μm on at least a grip portion of a shaft body.
A shaft with a shaft. 2. The surface roughness of the uneven pattern is from 0.1 μm to
The shaft body having an elastic uneven pattern according to claim 1, wherein the material of the uneven pattern is 3 μm and the material of the uneven pattern is urethane resin.