JPH0742324Y2 - Molded plastic products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a plastic molded product in which a tape end is embedded and molded.

[Prior Art] Conventionally, as a molded product of this type of plastic, the molded product has two tapes facing each other in the thickness direction, facing the front and back surfaces of the tape, extending in the length direction of the tape, and extending substantially parallel to a lattice shape. A plurality of windows arranged side by side are formed on the front and back surfaces of the tape so as to face each other, and the tape is sandwiched from the front and back surfaces during molding through these windows (for example, the actual opening 57
-45315 gazette, Japanese Utility Model Laid-Open No. 62-24721, Japanese Utility Model Laid-Open No. 63-99
No. 507).

[Problems to be solved by the invention] However, in the conventional molded product, the formation area of the window is set to be slightly smaller than the tape, and the pressure of the molten resin filled in the mold at the time of molding is As a result, the periphery of the tape may flap or curl up in the mold, resulting in defective molding.

Therefore, the present invention has been made in view of the above problems of the conventional technique, and an object of the present invention is to improve the formation area of the window portion so that the circumference of the tape generated at the time of molding can be improved. It is intended to prevent flapping in the mold.

[Means for Solving the Problems] The present invention is for achieving the above object, and the contents thereof will be described below with reference to the embodiments shown in the drawings.

The molded article according to claim 1, wherein the tip of the tape (1) is
The two outermost window portions (3a, 3g) located on both sides in the width direction of the tape while being positioned within the length (l) of the window portions (3a to 3g) It is characterized in that it is located within the width (w).

The molded product according to claim 2 is characterized in that the molded product is an insertion piece (2) having a tip inclined obliquely.

The molded product according to claim 3 is characterized in that the molded product is a buckle (12).

[Operation] According to the molded article of claim 1, the window (3a to
Through the 3g), the front end of the tape (1) and both ends in the width direction can be clamped.

According to the molded article of the second aspect, since the tip is inclined, it is easy to insert the belt into a belt loop (not shown).

According to the molded article of claim 3, it can be used as a buckle (12).

[Embodiment] The present invention will be described below based on an embodiment shown in the drawings.

1 to 5 show a first embodiment of the present invention, in which 1 is a tape, 2 is a plug-in piece as a molded plastic product formed by burying the end of the tape 1 inside. Show.

As shown in FIGS. 1 and 2, the tape 1 is made by weaving or knitting fibers into a strip shape. It is manufactured for a long time to some extent and cut into short according to the length of use. ,
Here, the end face is cut off at an angle of about 30 degrees.

The insertion piece 2 is thicker than the tape 1 and has a substantially parallelogram shape that is slightly larger than the tape 1 and includes the end of the tape 1 that is obliquely cut off. On both surfaces of the insertion piece 2 that face each other in the thickness direction of the tape 1, a plurality of tapes facing the front and back surfaces of the tape 1 and elongated in the length direction of the tape 1 are arranged in a grid pattern at substantially equal intervals.
The individual window portions 3a to 3g are formed on the front and back surfaces of the tape 1 so as to face each other. And the leading edge of each window 3a-3g,
Align with the slanted end face A of the tape 1 that is cut off diagonally,
Two outermost windows 3a, 3 located on both sides of the tape 1 in the width direction
Align the outer surface of g with the widthwise ends B and C of the tape 1.

Next, a mold for molding the insert piece 2 having the above-described structure will be described. As shown in FIGS. 3 to 5, a two-sided injection mold is used for this mold. Both molds 4,5
On each of the divided surfaces 4'and 5 ', concave cavities 6 and 7 corresponding to the shape of two pieces obtained by dividing the insertion piece 2 into two are engraved.
Here, a cross section that crosses the middle of the length of the insertion piece 2 in the thickness direction is set as a partition line.

Inside the cavities 6 and 7, the windows 3a to 3 of the insertion piece 2 are
Corresponding to the position of g, a plurality of raised portions 8a to 8g and 9a to 9g that are raised in a substantially rectangular shape from the bottoms of the cavities 6 and 7 are formed.

On one side of the split surface 5'of the mold 5, one end is formed on the rear surface of the cavity 7 and the other end is formed on the outer surface of the mold 5 with a shallow wide insertion groove 10 for inserting a tape. A long and narrow gate 11 is formed by engraving one end on the side surface of the cavity 7 and the other end on the outer surface of the mold 5. In this way, since the tape 1 is inserted into the insertion groove 10 of one mold 5, the cavity 7
Is set to be deeper than the cavity 6 of the other mold 4 by the thickness of the tape 1. Protrusions 9a-9g of one mold 5
Since the depth of the cavity 7 is deeper by the thickness of the tape 1, it is set lower than the dividing surface 5 ′ by the thickness of the tape 1, and the ridges 8 a to 8 g of the other die 4 are divided by the dividing surface 4 ′. Set the height approximately equal to ′.

Next, in order to mold the insertion piece 2 on the diagonally cut end of the tape 1 using the above-mentioned molds 4 and 5, the following procedure is performed.

First, after mounting the molds 4 on a molding machine (not shown), with both molds 4 and 5 open, the tape 1 is inserted into the insertion groove 10 of one mold 5 and inserted. The end of the tape 1 is inserted into the cavity 7 from the insertion groove 10. The slanted end face A of the tape 1 cut off diagonally is the ridges 9a to 9g that bulge in the cavity 7.
Aligned with the front end surface of the tape 1, the widthwise ends B and C of the tape 1 are located at the two outermost ridges 9a and 9 located on both sides of the tape 1 in the width direction.
Align and insert on the outer surface of g.

Then, after the molds 4 and 5 are clamped with the tape 1 kept in the position, the molten resin is filled from the open end of the gate 11.

When the molds 4 and 5 are clamped, the raised portions 8a to 8g facing each other,
Tape 1 is clamped from the front and back by 9a to 9g.
Are held approximately in the center of the height of the cavity 7. The tip of the tape 1 is held by the tips of the raised portions 8a to 8g, 9a to 9g, and both ends of the tape 1 in the width direction are the outermost portions located on both sides of the tape 1 in the width direction. It is held by two ridges 8a and 9a, 8g and 9g. Therefore, even if the molten resin is filled at a high pressure, the tape 1 is not biased to one side in both the cavities 7 and the tip end of the tape 1 and both ends in the width direction are not rolled up, and the tape 1 is melted around the tape 1. Resin wraps properly.

After cooling, the mold is opened and the molded product is
By sticking out from 7, the insertion piece 2 is integrally formed at the end of the tape 1.

In the dies 4 and 5 shown in the drawings, only one set of cavities 6 and 7 was engraved.However, a plurality of sets of cavities 6 and 7 were engraved and a plurality of differences were obtained by molding once. It is advisable to enable the insert 2. In addition, the pigment is mixed with the molten resin, and the tape 1
By molding the insert piece 2 of a color that matches the color of
It is possible to provide a product with a high decorative effect.

6 and 7 show another embodiment of the molded product according to the present invention. In this embodiment, a tape is attached to one end portion of a buckle 12 capable of connecting two tapes 1 and 1a with adjustable lengths. The terminal No. 1 is integrally molded with the terminal embedded inside.

The structure of the windows 3a to 3g of the buckle 12 and the molding position of the end of the tape 1 are as shown in FIG. 6, and the difference from the above-described embodiment is that the width direction of the tape 1 is different. Both side edges B, C of the tape 1 are located almost at the center of the width w of the two outermost windows 3a, 3g located on both sides in the width direction of the tape 1. Further, as shown by the arrow in FIG. 7, the other tape 1a can be passed through the buckle 12, and the other tape 1a can be connected to the tape 1 on which the buckle 12 is molded so that the length of the other tape 1a can be adjusted.

The structure of the mold and the molding procedure are similar to those of the previous embodiment, and the description thereof is omitted.

As described above, the purpose of the present invention is to prevent the front end surface A of the tape 1 and both side edges B and C in the width direction from fluttering during molding. Need only be positioned within the length 1 of the window 3a to 3g of the molded product, and the both side edges B and C of the tape 1 in the width direction are the outermost two located on both sides of the tape 1 in the width direction. It may be located within the width w of the window parts 3a, 3g.

[Advantages of the Invention] Since the present invention is configured as described above, it has the following effects.

According to the molded product of claim 1, it is possible to prevent fluttering of the tip end portion of the tape or both end portions in the width direction of the tape in the mold during molding, so that a molding defect is remarkable. It can be reduced.

According to the molded article of the second aspect, it is possible to provide an insert piece that is easily inserted.

According to the molded article of the third aspect, it can be used as a buckle.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a plan view of an insertion piece, FIG. 2 is a perspective view of the same, and FIG. 3 is a cross-sectional view of a mold.
4 is a sectional view taken along the line VI-VI of the above, FIG. 5 is a sectional view taken along the line VV of the above, FIG. 6 is a plan view of a buckle according to another embodiment of the present invention, and FIG. [Fig. 3] is a perspective view showing a usage state of the above. 1 ... tape, 2 ... insertion piece, 3a-3g ... the window, 12 ... buckle.

Claims (3)

[Scope of utility model registration request] 1. A plastic molded product in which the ends of the tape are embedded and molded, wherein the molded product faces the front and back surfaces of the tape on opposite sides in the thickness direction of the tape. A plurality of windows that are elongated in parallel with each other and are arranged substantially parallel to each other in a grid pattern are formed on the front and back surfaces of the tape so that they face each other, and the tape is sandwiched from the front and back surfaces during molding through these windows. In the molded product, the front end of the tape is located within the length of the window, and both end portions in the width direction of the tape are located at the two outermost window parts located on both sides in the width direction of the tape. A plastic molded product characterized by being positioned within the width. 2. The molded plastic product according to claim 1, wherein the molded product is an insert piece having a tip inclined obliquely. 3. The plastic molded article according to claim 1, wherein the molded article is a buckle.