JP3622040B2 - Manufacturing method of application destination for applicator - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a method for manufacturing an application destination for an applicator that applies an application agent such as a correction liquid, paint, paint, ink, glue, liquid cosmetic, powder cosmetic, and medicine.
[0002]
[Prior art]
The present applicant previously arranged a plurality of long and thin application pieces in a row so that a plurality of application rows formed by connecting one end of each application piece as a base so that the application pieces are staggered. A patent has been filed for a gist of an applicator in which a coating portion formed by laminating and connecting at least both ends of the base portion of the coating row is compressed in the laminating direction and fixed to the applicator main body (Japanese Patent Application No. 6). -55121).
[0003]
[Problems to be solved by the invention]
The present invention relates to a good production method in the case where the coating part in the above invention, that is, the coating tool application destination, is formed by using an injection molding method using a thermoplastic polymer.
As in the application destination for the applicator of the present invention, those formed by separating the application pieces made of a large number of thin and thin pieces from the base are unevenly arranged at the tips of the application pieces when formed by an injection molding method. Often becomes. This is because at the time of molding, the cooling state of the molten resin filled in the mold is different for each coating piece. That is, depending on various conditions such as the cooling time of the molded product, the thickness difference between the coated pieces, the cooling structure of the mold, the characteristics of the resin material used, etc., there is a difference in the cooling and solidification of each coated piece, A difference in cooling and solidification occurs between the front surface and the back surface, so that a phenomenon occurs in which the coating piece is deformed in the direction of spreading or the length is shortened.
[0004]
The present inventors investigated the cooling state of the molten resin filled in the mold when the application destination was injection-molded, and determined the position of the injection port (so-called gate) of the molten resin and the tip of each application piece. The present invention has been completed by finding that there is a correlation with the arrangement state.
[0005]
[Means for Solving the Problems]
According to the present invention, a plurality of coating pieces made of long and thin strips are spaced apart and arranged in a row, and a plurality of coating rows in which one end of each coating piece is connected to form a base so that the coating pieces are staggered. In the manufacturing method of the application destination for the applicator, in which the application destination for the thermoplastic polymer applicator formed by laminating and connecting at least both ends of the base portion of the application row to form a flange is formed by injection molding, the thermoplastic The gist of the manufacturing method of the application destination for the applicator is characterized in that the position of the injection port to the application destination of the polymer is the end surface of the collar in the arrangement direction of the application pieces.
[0006]
【Example】
1 to 5 show a first embodiment.
Reference numeral 1 is an applicator main body formed of a shaft cylinder in which an applicator accommodating portion 2 is formed. The applicator main body 1 has an opening at the tip and forms a mouth portion 3. At the front end of the applicator main body 1, an opening 4, which is a connecting portion with the mouth portion 3, is formed at the rear, and a front body 6 having a reduced diameter hole 5 is fixed to the front.
Reference numeral 7 denotes an application destination. The application destination 7 has an application piece 10 protruding from the diameter-reduced hole 5 of the tip body 6, and a flange 9 connected to the base 8 is connected to the mouth 3 and the tip. It is sandwiched between the front inner wall of the body 6 and fixed to the applicator main body 1.
[0007]
2 to 5 show the application destination 7, FIG. 2 is a front view of the application destination 7, FIG. 3 is a cross-sectional view taken along the line AA 'in FIG. 2, and FIG. FIG. 5 and FIG. 5 show side views of FIG.
The application destination 7 includes a plurality of long and thin flat application pieces 10 spaced apart and arranged in a row, and an application row 11 in which one end of each application piece 10 is connected to form a base 8, and the application pieces 10 are staggered. A plurality of layers are laminated so as to form a ridge 9 by connecting at least both ends of the base of the application row, and there are no gaps 12 between the multiple application pieces 10 as discharge parts for the coating agent. ing. This application destination 7 is a thermoplastic polymer such as a polyamide such as nylon, a thermoplastic resin such as polyethylene terephthalate or a polyester such as polybrene terephthalate, or a thermoplastic polymer such as an olefin, urethane, polyester, polyamide or styrene. Form using. The molding method is a so-called injection molding method in which the thermoplastic polymer is melted by heat, the molten resin is filled into a mold by screw compression or the like, and the molten resin is cooled and solidified and taken out from the mold. The material of the coating target 7, and the kind of coating agent used, but may be appropriately selected depending on the intended use of the sprayer, when the lateral cross-sectional area of the coating strips 10 is small, the thermoplastic resin is preferably used is, when the lateral cross-sectional area of the coating strip 10 is large, an elastic material such as a thermoplastic elastomer is preferred.
Further, the application destination 7 has the position of the molten resin injection port 13 at the time of injection molding as an end surface of the flange 9 in the arrangement direction of the application pieces 10.
In manufacturing the coating destination 7 of the present embodiment, the molten follicle is filled from the resin flow path (runner) 14 that is a part of the mold through the injection port 13, and thus is opposed to the injection port 13. The application row 11 is cooled and solidified on both sides equally. Further, at this time, the outer application pieces 10 are cooled and solidified on the inner surface side more slowly than the outer surface side, so that the outer application pieces 10 are deformed so as to be closer to the injection port 13, so that the application pieces are well organized.
In this embodiment, the injection port 13 is an intermediate part of the flange part 9 to prevent a dent (sink) that should not occur on the bottom surface of the flange part 9 that needs to be sealed with other parts. This is because the purpose is to increase the productivity of the application destination 7. That is, since a dent (sink) is likely to occur in the vicinity of the injection port 13, a dent (sink) is generated on the bottom surface of the buttock 9 by making the injection port 13 an intermediate portion of the ridge 9 away from the bottom of the buttock 9. Can be prevented. In addition, since the resin flow passage (runner) can be easily removed from the mold side, productivity is improved.
[0008]
A second embodiment is shown in FIGS.
In the second embodiment, in the first embodiment, the injection port 13 is formed as both end surfaces of the flange portion 9 in the arrangement direction of the coating piece 10, and the shape of the injection port 13 is a thin plate-like wide-range distributed gate. Except for the (film gate), it is the same as the first embodiment. Compared with the first embodiment, this embodiment has an advantage that molding defects (short mold) due to insufficient filling of the molten resin up to the tip of the coating piece 10 are less likely to occur.
In addition, the injection port 13 of the present embodiment may have a small circular shape like the injection port 13 of the first embodiment.
[0009]
A comparative example is shown in FIGS.
This comparative example is the same as the first embodiment except that the injection port 13 is the central portion of the flange 9 in the arrangement direction of the application piece 10 in the first embodiment.
In this comparative example, the molten resin is sequentially filled from the inlet 13 side into a plurality of laminated application rows 11 (in this comparative example, a laminate of five coating rows is illustrated). As a result, the coating row 11 closest to the injection port 13 takes longer to cool and solidify than the farthest coating row 11. As a result, the length of the application row 11 closest to the injection port 13 is shorter than that of the application row 11 farthest away. Further, in the coating row 11 closest to the inlet 13, it takes a longer time until the surface on the inlet 13 side is cooled and solidified than the surface on the opposite side. As a result, the application row 11 closest to the injection port 13 is deformed so as to open outward, so that the application destinations are easily scattered.
In addition, such a phenomenon also causes a problem that a biased stress is applied to the mold and the mold durability is lowered.
[0010]
Incidentally, the application destination obtained by the method for manufacturing an application destination for an applicator according to the present invention has been exemplified in the above embodiment for an applicator with a built-in coating agent. May be.
[0011]
【The invention's effect】
The manufacturing method of the application destination for the applicator of the present invention has the advantages that the tip can be aligned and the application destination can be manufactured with high productivity, and the load applied to the mold is small.
[Brief description of the drawings]
FIG. 1 is a partial sectional view of a first embodiment.
FIG. 2 is a front view of a coating destination of the first embodiment.
3 is a cross-sectional view taken along line AA ′ of FIG .
4 is a partially enlarged view of FIG. 3;
FIG. 5 is a side view of FIG. 2;
FIG. 6 is a front view of a coating destination according to a second embodiment.
7 is a cross-sectional view taken along the line AA ′ of FIG .
8 is a partially enlarged view of FIG. 7;
FIG. 9 is a front view of a coating destination of a comparative example.
10 is a cross-sectional view taken along line AA ′ of FIG .
11 is a partially enlarged view of FIG.
12 is a side view of FIG. 9;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Applicator main body 2 Application agent accommodating part 3 Mouth part 4 Open end 5 Diameter-reduction hole 6 Point body 7 Application destination 8 Base part 9 Nail part 10 Application piece 11 Application row | line | column 12 Crevice 13 Inlet 14

Claims (1)

A plurality of thin strips of application pieces are spaced apart and arranged in a row, and a plurality of application rows connected to one end of each application piece as a base are stacked so that the application pieces are staggered, In the manufacturing method of the applicator application destination, the application destination for the thermoplastic polymer applicator formed by connecting at least both ends of the base portion of the application row into a collar portion by injection molding, the thermoplastic polymer application A method for manufacturing an application destination for an applicator, wherein the position of the inlet to the tip is the end face of the collar portion in the direction of arrangement of the application pieces.

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