JP5114896B2 - Ballpoint pen manufacturing method - Google Patents

Description

  The present invention relates to a method for manufacturing a ballpoint pen body that is inserted directly into an opening of an ink containing tube or a connection member is inserted to connect a ballpoint pen tip.

Conventionally, when the rear end of the pen tip is press-fitted into the opening of the ink storage tube of the ballpoint pen body, the press-fitting of the pen tip into the ink storage tube is made smooth and incomplete press-fitting or press-fitting such as damage to the press-fitting portion is performed. In order to prevent the occurrence of defects, the front end of the ink filled in the ink storage tube is positioned at the front end opening of the ink storage tube, and then the pen tip is press-fitted and fixed to the front end opening of the ink storage tube. A ballpoint pen manufacturing method is disclosed.
JP 2003-341280 A

  However, in the manufacturing method described in the above-mentioned patent document, the press-fitting of the nib into the ink containing tube may be made smooth to prevent the occurrence of press-fitting failure such as incomplete press-fitting or damage to the press-fitting part. However, since the front end of the ink is positioned at the front end opening of the ink storage tube, the ink is interposed between the pen tip and the ink storage tube, and the members of the pen tip and the ink storage tube are directly connected to each other. In some cases, a part that cannot be removed occurs, the adhesion between the two decreases, and the pen tip tends to come off from the ink containing tube. Further, the ink leaks to the outside through a slight gap generated when the nib and the ink storage tube are connected, and the appearance stain of the ink storage tube is generated. With regard to such removal of the nib and stains on the appearance, it is not limited to the nib and the ink storage tube, but the same applies to the connection between the connecting member that connects the nib and the ink storage tube back and forth, and the ink storage tube. Met.

  The present invention provides a ballpoint pen body manufacturing method in which a ballpoint pen tip is inserted directly into an opening of an ink containing tube or a connecting member is inserted to leave a range for insertion of the ballpoint pen tip or connecting member of the ink containing tube. The gist of the present invention is a method for manufacturing a ballpoint pen body in which a ballpoint pen tip or a connecting member is inserted after ink is filled.

  The present invention is a method of manufacturing a ball-point pen body in which a ball-point pen tip or a connection member is inserted after filling with ink while leaving a range for insertion of the ball-point pen tip or connection member of the ink containing tube. When the rear end is inserted into the inner hole of the ink storage tube, the rear end thereof does not come into contact with the end surface of the ink, so that the ink does not move in the ink storage tube at this time, and the ink is a ball-point pen tip or a connecting member. And no gap between the ink storage tube. Therefore, the ball-point pen tip or the connection member and the ink storage tube are directly connected, the adhesion force is not reduced, and the ball-point pen tip or the connection member can be prevented from coming off. In particular, the ink may contain a lubricant for suppressing the wear of the ball seat due to the rotation of the ball. However, due to this lubricating effect, the adhesion between the two is not reduced. Furthermore, the ink does not leak to the outside from the gap between the ball-point pen tip or the connecting member and the ink storage tube generated during the connection, and the appearance of the ink storage tube can be prevented from being stained.

In the method of manufacturing the ballpoint pen body of the present invention, the ballpoint pen tip or the connection member is inserted after filling the ink while leaving the insertion margin range of the ballpoint pen tip or the connection member of the ink containing tube.
An ink filling nozzle is inserted into an inner hole of a tubular body obtained by extrusion molding of a thermoplastic resin such as polypropylene or polyethylene, or plastic deformation of a metal, and ink is filled. There are methods of applying an extrusion pressure to the ink, or inserting a suction nozzle from the opening opposite to the opening where the filling nozzle is inserted and discharging the ink from the filling nozzle by suction force. In any case, it is important that the ink pen is filled with ink while leaving a range for insertion of the ballpoint pen tip or the connecting member of the ink containing tube, and a specific method thereof will be described later.
If necessary, contact the ink interface as necessary to check the viscosity and remaining amount of the ink to be filled, and follow the ink interface with high-viscosity fluids such as polybutene, its gelled products, and silicone oil that are incompatible with the ink. It can also be arranged in layers to move. This high-viscosity fluid can also serve to suppress the backflow of ink.
When the ballpoint pen tip is press-fitted or the connecting member is press-fitted and the connecting member is attached after the ink and the high-viscosity fluid are filled as necessary, the ball-point pen tip is press-fitted into the connecting member. The ballpoint pen tip mainly consists of a ball as a writing member and a ball holder that is rotatably held in a state where it protrudes partially from the opening end of the through hole serving as an ink passage, and the ball is a writing surface such as paper. By rotating in contact with the ink, the ink attached to the surface of the ball is transferred to the writing surface to form handwriting. That is, since the handwriting is not formed unless the ink is in contact with the ball, the ink is brought into contact with the ball by, for example, applying a centrifugal force so that a force is applied to the ball-point pen tip side after the ink is filled and the ball-point pen tip is attached. .

As the ink, any of a pigment and a dye can be used as a colorant. Of course, it can also be used together. Since the pigment is a solid content, the viscosity of the ink may be relatively high, but the viscosity greatly depends on other compounds such as solvents and resins. When the viscosity of the ink is low, the charged ink may flow or may wet the insertion allowance range of the ball-point pen tip or the connecting member due to extended wetting, so that the viscosity is 200 [mPa · s] or more ( A shear rate of 1000 [1 / s] 25 ° C. is preferred.
In addition, when the ink has spinnability, the insertion allowance range of the ballpoint pen tip or the connecting member may be soiled. In such a case, the ink is preheated to about 30 ° C. to about 50 ° C., It is preferable that the ink filling process is performed in a state where the viscosity is relatively low and 10000 [mPa · s] or less and the spinnability is kept small.

Hereinafter, in each Example, a process shall transfer in order of an alphabet.
Example 1 (see FIG. 1)
Step (a)
The ink filling nozzle 3 is inserted into the ink containing tube 2 in a state where the ballpoint pen tip is not attached from an opening opposite to the side where the ballpoint tip 1 is attached.
At this time, the outer peripheral portion of the tip of the ink filling nozzle 3 is tapered, and the outer peripheral portion of the ink filling nozzle 3 is brought into contact with the opening of the ink containing tube 2 opposite to the side where the ball-point pen tip 1 is attached. Seal the opening.
Process (B)
The suction tube 4 that is constantly sucked is moved from the opening on the side where the ball-point pen tip 1 is attached to the inside of the ink storage tube 2, and the tip of the suction tube 4 is located on the side where the ball-point pen tip 1 of the ink storage tube 2 is inserted. Insert from the end face of the opening to a position (L1) that is equal to or greater than the insertion allowance range of the ballpoint pen tip 1.
Process (C)
Ink 5 is discharged from the ink filling nozzle 3. The suction pressure from the suction tube 4 is set lower than the ink discharge pressure of the ink filling nozzle 3, and the position (L1) where the interface of the ink 5 is equal to or greater than the insertion allowance range of the ball-point pen tip 1, that is, the suction tube 4 When the tip is reached, excess ink 5 from the suction tube 4 is removed from the ink storage tube 2. Therefore, the ink interface on the side where the ball-point pen tip 1 is attached stays at a position (L1) that is equal to or larger than the insertion allowance range of the ball-point pen tip 1, and it is possible to reliably prevent ink from being present within the insertion allowance range of the ball-point pen tip 1. .
Ink having high spinnability is heated in advance to keep the spinnability small, and it is easy to suck excess ink.
Process (D)
When the ink discharge from the ink filling nozzle 3 is finished and the ink filling nozzle 3 starts to retreat from the inside of the ink containing tube 2, the ink interface on the ink filling nozzle 3 side is always sucked from the suction tube 4. Shift from L3 to L4. As a result, when the ink filling nozzle 3 moves backward, it is possible to prevent the ink filling nozzle 3 from pulling ink and contaminating the inside of the ink containing tube 2.
Next, the suction tube 4 is retracted from the inside of the ink containing tube 2.
Process (E)
The ballpoint pen tip 1 is inserted into the ink storage tube 2 and installed.

Example 2 (see FIG. 2)
Step (a)
The ink filling nozzle 3 is inserted from the opening on the side where the ball-point pen tip 1 is attached into the ink containing tube 2 where the ball-point pen tip is not attached. The tip position of the ink filling nozzle 3 is set to a position (L1) that is not less than the insertion margin range of the ball-point pen tip 1 from the end face of the opening on the side where the ball-point tip 1 is inserted in the ink storage tube 2.
Process (B)
When a predetermined filling amount of ink 5 is discharged from the ink filling nozzle 3, the ink discharge is finished and the ink filling nozzle 3 is pulled out from the ink containing tube 2. Therefore, it is possible to prevent ink from existing within the insertion allowance range of the ballpoint pen tip 1.
The ink having high spinnability is heated in advance so that the spinnability is kept small, thereby preventing contamination inside the ink containing tube 2 due to ink pulling when the ink filling nozzle 3 is pulled out.
Process (C)
The ballpoint pen tip 1 is inserted and installed in the ink containing tube 2.

Example 3 (see figure 3)
Step (a)
The ink filling nozzle 3 is inserted into the ink containing tube 2 in a state where the ballpoint pen tip is not attached from the opening on the side where the ballpoint pen tip is attached to a position corresponding to the rear end interface of the filled ink.
Process (B)
The ink 5 is discharged while moving in the direction of pulling out the ink filling nozzle 3, and the discharge is terminated when the tip position of the ink filling nozzle 3 reaches a position (L1) that is not less than the insertion range of the ballpoint pen tip. Therefore, it is possible to prevent ink from existing within the insertion allowance range of the ballpoint pen tip 1.
The ink having high spinnability is heated in advance so that the spinnability is kept small, thereby preventing contamination inside the ink containing tube 2 due to ink pulling when the ink filling nozzle 3 is pulled out.
Process (C)
The ballpoint pen tip 1 is inserted and installed in the ink containing tube 2.

  In addition, about these Examples, the ball-point pen tip, the ink storage tube, and the ink used the components currently used for the commercially available ball-point pen (the product code | symbol BKL7-A by Pentel Co., Ltd.). The ballpoint pen tip is obtained by holding a cemented carbide ball with a stainless steel ball holder, and the ink containing tube is an extruded product made of polypropylene.

The ink was an oil-based dye ink having the following composition.
Spiron Black GMH Special (Dye, Hodogaya Chemical Co., Ltd.) 15.0 parts Bali First Violet # 1701 (Dye, Orient Chemical Co., Ltd.)
15.0 parts Ethylene glycol monophenyl ether 40.0 parts Benzyl alcohol 12.5 parts Resin SK (Ketone resin, manufactured by Huls (Germany)) 13.5 parts PVP K-90 (Polyvinylpyrrolidone, manufactured by ISP Japan Co., Ltd.) ) 2.0 parts Nimin L-201 (oxyethylene dodecylamine, manufactured by NOF Corporation) 2.0 parts These materials are mixed to 2500 [mpa · s] (shear rate 5000 [1 / s], 25 ° C. ) Oil-based dye ink was obtained.
The ink was heated to 40 ° C. during filling.

  In addition, the length from the opening to L2, which is an insertion allowance of the ball-point pen tip into the ink storage tube, is set to 2.7 mm, and the length from the opening to L1, which is the tip position of the filled ink, is set to 4 mm. .

The principal part sectional drawing which shows an example. The principal part sectional drawing which shows another example. The principal part sectional view showing still another example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ball-point pen tip 2 Ink storage tube 3 Ink filling nozzle 4 Suction tube 5 Ink L1 The position from the front end of an ink storage tube to the interface of the ink filled inside L2 From the front end of an ink storage tube to the ink storage tube of a ball-point pen tip Insertion position

Claims (1)

In a method for manufacturing a ballpoint pen body that is inserted directly into the opening of the ink storage tube or connected to a ballpoint pen tip by inserting a connection member, the ink is filled without leaving the insertion margin range of the ballpoint pen tip or connection member of the ink storage tube. After that, a method for manufacturing a ballpoint pen body in which a ballpoint pen tip or a connecting member is inserted.