JPH11129668A - Porous pen body for writing or coating tool and its preparation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a porous pen body which satisfy soft writing touch rich in elastic feeling and durability and is suitable for a writing or coating tool which makes various inks, coating liq., cosmetic liq., etc., flow out and a method for preparing it. SOLUTION: The titled porous pen body is constituted of an outer shell part 2 molded with a void vol. in a range of approximately 40-85% by fusing mutual contact points of a powder 4 with a mean particle diameter of 50-300 μm made of an ultrahigh mol.wt. polyethylene with an average mol.wt. of approximately 2,500,000-5,000,000 and an induction core 3 arranged at the center of the outer shell part 2. It is obtd. by filling the above described powder in a mold with a space for a specified shape and molding it by heating.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a porous pen for a writing or applicator and a method for producing the same. More specifically, mutual contact points of powders of ultra-high molecular weight polyethylene having an average molecular weight of about 2.5 to 5 million and an average particle diameter of 50 to 300 μm are fused to form a porosity of about 40 to 85%. A porous pen body having an outer shell part, satisfying soft writing feeling and endurance rich in elasticity, suitable for writing or applicator for flowing out ink, various coating liquids, cosmetic liquids and the like, and production thereof About the method.

[0002]

2. Description of the Related Art Conventionally, a powder mixture is prepared by blending a predetermined amount of a powder of a water-soluble salt or the like with a fine powder of a polyolefin resin, a polyurethane resin or the like as a porous pen body formed by using a thermoplastic fine powder. Is filled in a mold having a predetermined shape space, and the thermoplastic fine powder is melted by heating to obtain a molded body.Then, the salt is eluted to form a porous body, a polyamide resin powder, etc. It is known to fill a metal mold having a shape space and heat-bond the contacts of the powders by heat treatment.

[0003]

SUMMARY OF THE INVENTION The present invention relates to a new pen body having both a soft writing feeling rich in elasticity, resistance to various liquids, and endurance. An object of the present invention is to provide a porous pen body suitable for a writing or applicator to be made, and a method for producing the same.

[0004]

The present invention will be described with reference to the drawings (see FIGS. 1 to 3). According to the present invention, the powder 4 having an average particle diameter of 50 to 300 μm and ultra-high molecular weight polyethylene having an average molecular weight of about 2.5 to 5,000,000 are fused to each other to form a contact point, and the porosity is formed in a range of about 40 to 85%. The written or applied porous pen body 1 for an applicator is required. Further, the powder 4 having an average particle diameter of 50 to 300 μm and a powder 4 of ultra high molecular weight polyethylene having an average molecular weight of about 2.5 to 5,000,000 are fused together to form a porosity of about 40 to 85%. And a guide core 3 disposed at the center of the outer shell portion 2, wherein the guide core 3 has one end exposed from one end of the outer shell portion 2 for a writing or applicator porosity. The quality pen body 1 is required. Further, the powder 4 is fluffy, the guiding core 3 is a rod-like body having a large number of capillary gaps exposed at least in the outer surface axial direction, and a space corresponding to the outer shape of the outer shell 2 is provided. The guide core 3 is arranged at the center of the provided molding die 5 in the axial direction, and the average particle size of the ultra-high molecular weight polyethylene is 50 to 50 around the guide core 3.
The powder 4 selected from 300 μm is filled and heated to fuse the contact points between the powders, and the porosity is about 40 to 85.
% Of the outer shell portion 2 and the guide core 3 are integrated at the center position.

[0005] In the above, the average particle diameter of the powder 4 is 50
In a system smaller than μm, the gap formed between the particles is too small, the porosity is too small, and the outflow of the liquid is insufficient. On the other hand, in a system having an average particle diameter of more than 300 μm, the void volume becomes excessive even if the liquid outflow property is satisfied, and the durability is not satisfied. A suitable average particle size range is 60 to 200 μm, more preferably 80 to 180 μm.
It is in the range of μm, and satisfies the liquid outflow property, endurance and writing feeling. When the porosity is less than 40%, the outflow property of the liquid is insufficient, and when the porosity is more than 85%, the durability is insufficient,
The range of about 50 to 75% satisfies both of the above-mentioned properties, and is a practically preferable range. Although the form of the powder 4 is not specified, a fluff-like form is most effective for fusing between powders and rich in porous retention, and is optimal. May be used. Outer shell 2
And a guide core 3 disposed at the center of the outer shell 2, wherein the guide core 3 has a function of discharging liquid and the outer shell 2.
It fulfills the function of reinforcing strength. To explain this point, in a porous body formed by fusing powders together, a gap volume for absorbing and holding a liquid is large and has a property of being rich in liquid retention, but the gap is, Due to the complex entanglement and the formation of a three-dimensional network structure, the capillaries are entangled in a wide variety and are elongated, thereby slowing the speed at which the liquid is led out to the writing tip by capillary action. As a main matter of the pen body, it is necessary to satisfactorily extract the liquid and satisfy the durability even in shorthand. In the present invention, the guide core 3 having a capillary gap in the longitudinal direction and having the capillary gap exposed on the outer surface and the central position of the porous body are arranged at the center of the porous body, so that the liquid can be quickly discharged by the capillary force of the guide core 3 itself. The liquid is supplied to the outer shell portion 2 which is introduced and comes into contact with the guide core 3, is combined with the liquid introduced from the outer shell portion 2 itself, and according to the writing speed,
A pen body that allows the liquid to flow out from the writing tip abundantly and satisfies the above requirements. Further, since the outer shell 2 is a porous body in which the powders are fused together, the outer shell 2 has a poor rigidity against writing pressure and is insufficient in bending strength with an increase in porosity. The outer shell 2 is reinforced by insertion. As the guide core 3, a resin-processed rod of a fiber bundle, in which a number of longitudinal capillary gaps are integrally formed inside and outside, a plastic rod having a number of slits in the outer surface axial direction, and the like are effective.

Next, a manufacturing method will be described. The porous body of the present invention is filled with a powder in a mold having a space of a predetermined shape and size, and heated to a temperature of at least the melting point of the powder by a conventional general-purpose electric heating means or the like to fuse the contact points of the powders. A fine capillary gap is formed between the fused powders. In the system in which the guide core 3 is provided, one end of the guide core 3 is fixed and arranged at the center of the space in the mold 51,
After the powder 4 is tightly packed around the periphery thereof, fusion is performed by the same heating means as described above to obtain the pen body 1 in which the induction core 3 and the porous outer shell 2 are integrated.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The pen body of the present invention can be obtained by preparing a predetermined powder, filling it into a mold provided with a space of a predetermined shape, and performing heat molding. In the above step, after the powder is filled, a minute vibration is applied to the mold from the outside to uniform the closeness between the powders. Here, depending on the shape and size of the space of the mold, a cylindrical shape, a flat shape,
In addition, various pen bodies can be manufactured according to the purpose. or,
The writing feel and the porosity can be adjusted by the particle size distribution of the powder and the magnitude of the pressure applied to the powder after the powder is filled, so that various pens can be obtained according to the purpose. Examples are described below, but the present invention is not limited to these examples. The powder 4 may be an ultra-high molecular weight polyethylene powder manufactured by Hoechst [GUR of Hostalen (registered trademark)].
2122 (average molecular weight about 4.4 million, average particle size 120 ±
A fluffy material having a particle size of 30 μm and a particle diameter of 63 μm or less occupies 25%) was applied. Example 1 (not shown) First mold 5 provided with a space of φ3 mm × L40 mm
A second mold 52 having a shell-shaped recess formed at one end opening of the first mold 1 is attached, and after the powder 4 is filled by natural fall, a minute vibration is applied from the outer surface of the mold to uniformly disperse the powder 4. After heating at 230 ° C. for about 30 minutes and cooling the mold by natural standing, the molded body was taken out, and the porosity was about 6
A pen body 1 having a shell-shaped end at 3% was obtained. Example 2 (see FIGS. 1 and 3) First mold 5 provided with a space of φ3 mm × L40 mm
1, one end opening portion is provided with a resin-processed fiber bundle (porosity of about 60).
% Of a rod having an outer diameter of about 1.5 mmφ) and a third mold 53 to which the resin processing body is positioned at the axis of the space. The powder 4 is filled from the opening at the end, a second mold 52 having a shell-shaped concave portion is attached, and fine vibration is applied to the entire mold with the mold 53 facing upward to uniformly disperse the powder 4. Distributed.
Next, the pen body 1 was molded under the same heating conditions as in the first embodiment, and the outer shell portion 2 had a void of about 60%, and the guide core 3 was integrally fixed to the axial center, and the tip shape was a bullet-shaped pen body 1. I got Example 3 (see FIG. 2) An induction core 3 made of the same resin processed body as in Example 2 except that the enlarged portion 31 was formed at one end was heated and molded in the same manner as in Example 2, and The pen body 1 in which the void of the shell portion 2 was about 60% and the guide core 3 was integrally fixed was obtained.

[0008]

The pen body of the present invention has both a soft writing feeling rich in elasticity, resistance to various liquids and durability, and a writing material for writing ink for writing instruments, various coating liquids, and cosmetic liquids. Or, it is applied for an applicator.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part of an embodiment of the pen body of the present invention.

FIG. 2 is a longitudinal sectional view of a main part of another embodiment of the pen body of the present invention.

FIG. 3 is an explanatory longitudinal sectional view of a method for manufacturing a pen body of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pen body 2 Outer shell part 3 Induction core 31 Enlarged part 4 Powder 5 Molding mold 51 First mold 52 Second mold 53 Third mold

Claims (5)

[Claims] An ultra high molecular weight polyethylene having an average molecular weight of about 2.5 to 5,000,000 has an average particle size of 50 to 300 μm.
Are fused together to form a porosity of about 40-85.
% Of the porous pen for writing or applicator molded in the range of%. 2. The ultra-high molecular weight polyethylene having an average molecular weight of about 2.5 to 5,000,000 has an average particle diameter of 50 to 300 μm.
Are fused together to form a porosity of about 40-85.
% Of the outer shell part, and a guide core arranged at the center of the outer shell part, the guide core having one end exposed from one end of the outer shell part for a writing or applicator. Porous pen body. 3. The porous pen for a writing or applicator according to claim 1, wherein the powder is fluffy. 4. The guide core is a rod-shaped body having a large number of capillary gaps exposed at least in the axial direction of the outer surface.
A pen for a writing or applicator according to any one of the above. 5. An induction core is arranged at a central position in the axial direction of a molding die provided with a space corresponding to the outer shape of the outer shell, and an average particle diameter of the ultra-high molecular weight polyethylene of 50 mm around the induction core. A powder selected from a powder having a porosity of about 4 to about 300 μm is filled and heated to fuse the contact points between the powders.
A method for producing a porous pen for a writing or applicator, comprising forming an outer shell of 0 to 85% and integrating the guide core at a center position.