Insert molded article

Abstract

To provide an insert molded article that suppresses distorted deformation in which an original shape of the insert molded article in a top view collapses.SOLUTION: The insert molded article 4 has an insert member 6 having a coated 6a and a molded article body 7, the insert member 6 has an upper surface 6b, a side peripheral 6b hanging down from an outer peripheral edge of the upper surface 6c, and a plurality of sets of a gate hole 6b1 and a recess 6d, and the recess 6d is partitioned from another recess 6e by an exposed 6d of the insert member 6 not covered with the molded article body 7. The film 6b extends over the upper surface of the upper surface 6c and the outer peripheral surface of the side peripheral 6a, the film 6e is provided along the exposed portion 6e at the exposed portion 6b1 and a peripheral portion thereof, the gate hole portion 6b1 penetrates upward through the upper surface 6d to the recessed portion 6b corresponding to the gate hole portion, the side peripheral has, in one or more recessed portions, a window hole portion that is an opening portion penetrating through the side peripheral, and the molded product body 7 is filled in the gate hole portion, the recessed portion, and the window hole portion. 6d 6c 6c1 6b1 6d 6c1 6c.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an insert molded product. [Background technology]

[0002] BACKGROUND ART Insert molded articles having an insert member and a molded article main body are known (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 7278925 Summary of the Invention [Problem to be solved by the invention]

[0004] In an insert-molded product such as the one described above, the insert member has a top wall, side peripheral walls depending from the outer periphery of the top wall, and multiple sets of gate holes and recesses, the recesses are separated from the other recesses by exposed portions of the insert member that are not covered by the main body of the molded product, and extend across the upper surface of the top wall and the outer periphery of the side peripheral walls, and the main body of the molded product is filled into the gate holes and recesses, and it is sometimes required to provide a coating such as a vapor-deposited film along the exposed portions of the insert member and their surrounding areas for design effects, etc. However, in this case, when the main body of the molded product thermally shrinks after the insert-molded product is removed from the mold after insert molding, the coating covering the portion adjacent to the exposed portion of the insert member, particularly on the side peripheral walls, inhibits welding of that portion to the main body of the molded product, resulting in uneven shrinkage of the outer periphery of the insert-molded product and the risk of distortion that destroys the original shape of the insert-molded product when viewed from above. For example, in the case where the original shape is circular when viewed from above and three sets of gate holes and recesses are provided, a distortion that approaches a triangle will occur.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an insert-molded product that is prevented from being distorted and deformed to lose its original shape as viewed from above. [Means for solving the problem]

[0006] One aspect of the present invention is as follows.

[0007] [1] The molded article has an insert member having a coating and a molded article body, the insert member has a top wall, a side peripheral wall depending from the outer periphery of the top wall, and a plurality of sets of gate holes and recesses; The recess is separated from the other recesses by an exposed portion of the insert member that is not covered by the molded article main body, and extends across an upper surface of the top wall and an outer peripheral surface of the side peripheral wall, the coating is provided along the exposed portion and its surrounding area, the gate hole portion penetrates the top wall upward to the recess portion corresponding to the gate hole portion, the peripheral side wall has a window hole portion, which is an opening penetrating the peripheral side wall, in one or more of the recesses, The molded product body is an insert molded product that is filled into the gate hole portion, the recess portion, and the window hole portion.

[0008] [2] the number of pairs of the gate hole portion and the recess portion provided in the insert member is three or more; the exposed portions are top surfaces of protrusions provided on the upper surface of the top wall and the outer peripheral surface of the side peripheral wall, the protrusions are composed of three or more linear protrusions, the number of which is the same as the number of pairs of the gate holes and the recesses provided in the insert member, and have a connecting portion where the three or more linear protrusions are connected on the upper surface of the upper wall, the linear protrusion extends across the connecting portion and a lower end of the outer circumferential surface of the side peripheral wall, The insert-molded product according to [1], wherein the gate hole is provided in the vicinity of the connecting portion of the protrusion.

[0009] [3] A container body having a mouth and a lid for opening and closing the mouth, The lid includes an outer cap made of the insert molding product according to [1] or [2] and having a top wall portion and an outer peripheral wall portion, and an inner cap having a top wall and an outer peripheral wall, an outer peripheral surface of the outer peripheral wall of the inner cap is fitted to an inner peripheral surface of the outer peripheral wall of the outer cap so as to be rotatable together; A container, wherein the inner peripheral surface of the outer peripheral wall of the inner cap is screwed onto the outer peripheral surface of the mouth portion. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide an insert-molded product that is prevented from undergoing distortion that would destroy the original shape of the insert-molded product when viewed from above. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a side view showing a container having an insert molding according to an embodiment of the present invention. [Figure 2] FIG. 2 is a top view of the container shown in FIG. [Figure 3] 3 is a cross-sectional view taken along the line AA in FIG. 2. [Figure 4] FIG. 2 is a bottom view of the insert molding product shown in FIG. [Figure 5] 2 is a partial cross-sectional side view of an insert member of the insert-molded product shown in FIG. 1. [Figure 6] FIG. 6 is a top view of the insert member shown in FIG. 5. [Figure 7] FIG. 6 is a bottom view of the insert member shown in FIG. 5. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0013] As shown in FIGS. 1 to 4 , in one embodiment of the present invention, a container 1 includes a container body 2 having a mouth 2a, a body 2b, and a bottom 2c arranged in this order, and a lid 3 for opening and closing the mouth 2a. The lid 3 includes an outer cap formed of an insert-molded product 4 having a top wall 4a and an outer peripheral wall 4b, and an inner cap 5 having a top wall 5a and an outer peripheral wall 5b. The outer peripheral surface of the outer peripheral wall 5b of the inner cap 5 is rotatably fitted to the inner peripheral surface of the outer peripheral wall 4b of the outer cap, and the inner peripheral surface of the outer peripheral wall 5b of the inner cap 5 is threadedly fitted to the outer peripheral surface of the mouth 2a. The outer peripheral wall 4b of the insert-molded product 4 is cylindrical, with the center at the central axis O. Note that the outer peripheral wall 4b is not limited to a cylindrical shape and may be configured in a cylindrical shape other than a cylindrical shape, such as an elliptical cylindrical shape. While the container 1 is jar-shaped in this embodiment, it is not limited to this and may be configured in a bottle-shaped or tube-shaped shape, for example.

[0014] In this embodiment, the direction along the central axis O is referred to as the vertical direction, the direction from the bottom 2c toward the mouth 2a along the vertical direction is referred to as the upward direction, the opposite direction is referred to as the downward direction, the direction perpendicular to the central axis O is referred to as the radial direction, and the direction circumferentially around the central axis O is referred to as the circumferential direction.

[0015] 5 to 7, the insert molded product 4 has an insert member 6 having a coating 6a, and a molded product main body 7. The insert member 6 has an upper wall 6b, a peripheral side wall 6c hanging down from the outer periphery of the upper wall 6b, and multiple sets (three sets in this embodiment) of gate holes 6b1 and recesses 6d. In this embodiment, the number of sets of gate holes 6b1 and recesses 6d provided in the insert member 6 is three, but is not limited to this, and may be two or more.

[0016] The recesses 6d are separated from the other recesses 6d by exposed portions 6e (see FIGS. 1 and 2) of the insert member 6 that are not covered by the molded article main body 7, and extend across the upper surface of the top wall 6b and the lower end of the outer peripheral surface of the side peripheral wall 6c. The exposed portions 6e are the top surfaces of protrusions 6f provided on the upper surface of the top wall 6b and the outer peripheral surface of the side peripheral wall 6c (see FIGS. 5 and 6). In this embodiment, the protrusions 6f consist of three linear protrusions 6f1, the same number as the number of pairs of gate holes 6b1 and recesses 6d provided in the insert member 6. The upper surface of the top wall 6b has a connecting portion 6f2 where the three linear protrusions 6f1 are connected. The linear protrusions 6f1 extend across the connecting portion 6f2 and the lower end of the outer peripheral surface of the side peripheral wall 6c. In this embodiment, the linear protrusions 6f1 are linear, but this is not limiting and they may be curved.

[0017] The coating 6a is provided on the exposed portion 6e and its surrounding area along the exposed portion 6e (see FIGS. 5 and 6). In this embodiment, the coating 6a is formed by vapor deposition, but this is not limiting and the coating may be formed by spraying, dipping, brushing, or other coating methods other than vapor deposition. The coating is performed by masking the areas where the coating 6a is not to be provided. The material for forming the coating 6a is not particularly limited, and is, for example, a metal such as aluminum. The material for forming the insert member 6 is not particularly limited, and is, for example, a resin.

[0018] The gate holes 6b1 extend upward through the upper wall 6b near the connecting portions 6f2 of the protrusions 6f to the recesses 6d corresponding to the gate holes 6b1 (see FIG. 3). The lower surface of the upper wall 6b has communicating recesses 6b2 that communicate with all of the gate holes 6b1.

[0019] The peripheral side wall 6c has window holes 6c1, which are openings that penetrate the peripheral side wall 6c, in each recess 6d (see FIGS. 5 and 6). That is, the peripheral side wall 6c has three window holes 6c1, the same number as the number of pairs of gate holes 6b1 and recesses 6d provided in the insert member 6. Each window hole 6c1 consists of a single opening. While it is preferable that the window hole 6c1 consists of a single opening, it may also consist of multiple openings.

[0020] The molded product main body 7 is filled into the communicating recess 6b2, the gate hole 6b1, the recess 6d, and the window hole 6c1 (see FIG. 3). Therefore, the upper surface of the top wall 4a of the insert-molded product 4 is composed of the top surface of the portion of the convex portion 6f that is located on the top wall 4a and the upper surface of the portion of the molded product main body 7 that is filled into each recess 6d and that is located on the top wall 4a. The outer peripheral surface of the outer peripheral wall 4b of the insert-molded product 4 is composed of the top surface of the portion of the convex portion 6f that is located on the outer peripheral wall 4b and the outer peripheral surface of the portion of the molded product main body 7 that is filled into each recess 6d and that is located on the outer peripheral wall 4b. The lower surface of the top wall 4a of the insert-molded product 4 is composed of the portion of the lower surface of the upper wall 6b of the insert member 6 that is located outside the communicating recess 6b2 and the lower surface of the portion of the molded product main body 7 that is filled into the communicating recess 6b2. The inner surface of the outer wall portion 4b of the insert molded product 4 is composed of the inner surface of the side wall 6c of the insert member 6 other than the window hole portion 6c1, and the inner surface of the portion of the molded product main body 7 that fills the window hole portion 6c1.

[0021] The molded article main body 7 is formed as heated molten resin injected from the gate of the mold into the communicating recesses 6b2 of the insert member 6, which is inserted into the cavity of the mold that has been clamped. The molten resin injected into the communicating recesses 6b2 passes from the communicating recesses 6b2 through the gate holes 6b1, filling the recesses 6d corresponding to the gate holes 6b1, and then fills the window holes 6c1. At this time, the molten resin also comes into contact with the mold at the portion filling the window holes 6c1, allowing heat to be quickly dissipated from the molded article main body 7 to the mold at the outer peripheral wall 4b of the formed insert-molded article 4. This prevents distortion that would cause the original top-view shape of the insert-molded article 4 to be lost due to thermal contraction after the mold is opened.

[0022] In this embodiment, the three recesses 6d have the same circumferential width, and therefore a window hole 6c1 is provided in each recess 6d. However, if the three recesses 6d have different circumferential widths, or if four or more recesses 6d are provided with different circumferential widths, it is not necessary to provide a window hole 6c1 in a recess 6d having a circumferential width such that the amount of thermal contraction is negligible.

[0023] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and the above-described embodiments can be modified in various ways without departing from the gist of the present invention. [Example]

[0024] An insert-molded product having the same configuration as the above-described embodiment was produced, except that the circumferential widths of the three recesses were not the same. The first radial width (a), which is the width of the insert-molded product in the first radial direction, and the second radial width (b), which is the width in the second radial direction perpendicular to the first radial direction, were measured, and the difference between them was calculated. For comparison, an insert-molded product without window holes was also produced, and similar measurements and calculations were performed. The results are shown in Table 1.

[0025] [Table 1]

[0026] The difference (ab) indicates the degree of distortion from the original circular shape when viewed from above. As can be seen from Table 1, the difference was 1.56 mm for the comparative example without window holes, while it was 0.36 mm for the example with window holes, confirming that the present invention can significantly suppress distortion. [Explanation of symbols]

[0027] 1 container 2 Container body 2a Mouth 2b Torso 2c bottom 3 Lid 4 Insert molding (outer cap) 4a Ceiling wall 4b Outer wall 5 Inner cap 5a Ceiling wall 5b Peripheral wall 6 Insert material 6a Coating 6b Top wall 6b1 Gate hole 6b2 Connecting recess 6c Side wall 6c1 Window hole 6d recess 6e Exposed part 6f convex part 6f1 Linear convex part 6f2 connection part 7 Molded product body O center axis

Claims

1. The molded article has an insert member having a coating and a molded article body, the insert member has a top wall, a side peripheral wall depending from the outer periphery of the top wall, and a plurality of sets of gate holes and recesses; The recess is separated from the other recesses by an exposed portion of the insert member that is not covered by the molded article main body, and extends across an upper surface of the top wall and an outer peripheral surface of the side peripheral wall, the coating is provided along the exposed portion and its surrounding area, the gate hole portion penetrates the top wall upward to the recess portion corresponding to the gate hole portion, the peripheral side wall has a window hole portion, which is an opening penetrating the peripheral side wall, in one or more of the recesses; The molded product body is an insert molded product that is filled into the gate hole portion, the recess portion, and the window hole portion.

2. the number of pairs of the gate hole portion and the recess portion provided in the insert member is three or more; the exposed portions are top surfaces of protrusions provided on the upper surface of the top wall and the outer peripheral surface of the side peripheral wall, the protrusions are composed of three or more linear protrusions, the number of which is the same as the number of pairs of the gate holes and the recesses provided in the insert member, and have a connecting portion where the three or more linear protrusions are connected on the upper surface of the upper wall, the linear protrusion extends across the connecting portion and a lower end of the outer circumferential surface of the side peripheral wall, The insert-molded product according to claim 1 , wherein the gate hole is provided in the vicinity of the connecting portion of the protrusion.

3. A container body having a mouth and a lid for opening and closing the mouth, The lid includes an outer cap made of the insert-molded product according to claim 1 and having a top wall portion and an outer peripheral wall portion, and an inner cap having a top wall and an outer peripheral wall, an outer peripheral surface of the outer peripheral wall of the inner cap is fitted to an inner peripheral surface of the outer peripheral wall of the outer cap so as to be rotatable together; A container, wherein the inner peripheral surface of the outer peripheral wall of the inner cap is screwed onto the outer peripheral surface of the mouth portion.

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