JP2002326650A - Hinge of synthetic resin container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hinged cap formed by in-mold forming with a film as a hinge, a compact and other moldings including a hinge, while a resin other than polypropylene(PP) can be used as a material resin. SOLUTION: The hinged cap comprising a cap base and an open/close lid coupled with the cap body via a hinge has the hinge formed of a film glued to a predetermined position on a side peripheral wall of the cap body and a side peripheral wall of the open/close lid by in-mold forming.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a hinge for a synthetic resin container.

[0002]

SUMMARY OF THE INVENTION A hinge type cap,
For hinges on compact and other synthetic resin containers, PP
Is frequently used, and therefore, there is a problem that the material resin of the cap and the container is limited to PP. When the material resin is PP, since the PP itself is opaque, a transparent cap or container cannot be obtained, and printing on the dome-shaped curved surface cannot be easily performed, so that decoration is limited. There was a problem.

It is also known to use a flexible sheet as a hinge in a compact container or the like (see, for example, Japanese Utility Model Publication No. 3-19292). According to the above technique, since the entire rectangular container is covered with a flexible sheet and bent at the straight edge of the container, insert molding can be easily performed. Is attached to the arcuate edges facing each other, so that the hinge portion cannot be easily formed, and the above problem cannot be solved.

An object of the present invention is to solve the above problems by using a resin other than PP as a material resin, comprising a hinge type cap formed by in-molding a film as a hinge, a compact cap, and other hinges. The purpose is to provide a molded article.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a hinge-type cap comprising a cap base and an opening / closing lid attached to the cap base via a hinge. Wherein the hinge is formed by a film adhered at predetermined positions on the side peripheral wall of the cap base and the side peripheral wall of the opening / closing lid by in-mold molding.

As another embodiment of the film, a structure characterized in that the film is adhered to a predetermined position of the side peripheral wall of the cap base and the entire surface of the opening / closing lid, or
A configuration is adopted in which the cap body is adhered to a predetermined position of the side peripheral wall, the top wall upper surface, and the entire surface of the opening / closing lid.

As a hinge mechanism of the three-point hinge, the hinge is formed by a predetermined position on the side peripheral wall of the cap base and the side peripheral wall of the opening / closing lid, and a film adhered at predetermined positions on both sides of the three-point hinge by in-mold molding. Is adopted.

[0008] As a compact, in a compact comprising a case main body and an opening / closing lid attached to the case main body via a hinge, the hinge is provided at predetermined positions on a side peripheral wall of the case main body and a side peripheral wall of the opening / closing lid. A structure characterized by being formed by a film adhered by in-mold molding is adopted, and a structure characterized by the film being adhered to the entire surface of the case body and the opening / closing lid is adopted.

In a synthetic resin container having a case main body and an opening / closing lid attached to the case main body via a hinge and having an elliptical cross section or an arcuate side edge, a hinge is used. Is formed by a film adhered to a predetermined position of the side peripheral wall of the case body and the side peripheral wall of the opening / closing lid by in-mold molding, and the film is formed by a side peripheral wall of the case body. And a configuration characterized by being adhered to the predetermined position and the entire surface of the opening / closing lid.

As a decoration of the film, a structure is characterized in that a pattern is printed on a covering portion where the film is adhered to the opening / closing lid, and the coating is such that the film is adhered to both the case body and the opening / closing lid. A configuration is adopted in which a pattern is printed on the section. In addition, a configuration characterized by being a stretched film of PET, PE, AS, or PS is used as a material of the film.

[0011]

Next, a first embodiment of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral A denotes a hinge-type cap, which includes a cap base A1 and an opening / closing lid A2, both of which are continuously provided via a film B having a hinge. As the resin material of the hinge type cap A, PP, PE, or the like is used, and the film B is made of PE.
A stretched or unstretched film of T, PE, AS, PS is used.

As shown in FIG. 2, the cap base A1 is
It has a top wall 1 and a side peripheral wall 2, and a pouring cylinder 4 having a pouring hole 3 formed in the center is erected on the top wall 1, and a peripheral edge is a stepped portion 5. On the lower surface of the top wall 1, a sealing ring 6 which engages with the inner periphery of the container mouth and seals the inside of the container is vertically provided. A screw 7 that engages with a screw threaded on the outer periphery of the container mouth is screwed on the inner periphery of the side peripheral wall 2, and a hinge portion B1 of the film B is adhered to the upper outer peripheral surface on the hinge side. Have been.

The opening / closing lid A2 has a top wall 10 and a side peripheral wall 11, and a plug 12 for closing the pouring hole 3 is vertically provided on the lower surface of the top wall 10. A dome-shaped covering portion B2 of the film B is adhered to the opening / closing lid A2 so as to cover the entire surface of the top wall 10 and the side peripheral wall 11. On the side of the side peripheral wall 11 opposite to the hinge, a knob 13 is provided.

As shown in FIG. 3, the film B comprises the hinge portion B1 and the covering portion B2.
Has a certain width, and cuts 14a, b of a certain length extending from both side edges of the hinge part B1 are formed in the covering part B2.

On the side of the opening / closing lid A2, the hinge portion B1 is provided with a lower end face of the side peripheral wall 11 of the opening / closing lid A2 and cuts 14 at both ends.
The non-adhesive layer 16a is a portion surrounded by the curved lines 15a connecting the front ends of the points a and b and the three points near the lower end face of the central portion. Non-adhesive layer 16b. That is, a portion surrounded by the curved lines 15a and 15b and both side edges is a non-adhesive layer, and the other portions of the hinge portion B1 and the covering portion B2 are an adhesive layer.

The length L of the connecting portion in the cross section perpendicular to the hinge axis of the hinge portion B1 is twice as long as the distance h from the upper and lower end surfaces of each side peripheral wall to the curved line. Has the following effects.

That is, when opening and closing the opening / closing lid A2,
At the time of closing the cover, as shown in FIG. 1, the hinge portion B1 is joined to the lower end surface of the opening / closing cover A2, and a cut 14 is formed between the hinge portion B1 and the covering portion B2.
Even if there are a and b, they are flush. Fig. 3
As shown in (1), the hinge portion B1 is separated from being joined along the curved lines 15a and 15b, and the cross section in the direction perpendicular to the hinge axis has an arch shape.

Next, a molding method will be described. In FIG. 4, reference numeral 20 denotes a fixed die, and 21 denotes a movable die, each having split dies 22a and 22b of the cap base A1, split dies 23a and 23b of the opening / closing lid A2, and hinge forming portions 24a and 24b. I have. 25 is a movable core, 26 is a heater.

First, the upper surface of the cap base A1 of the movable mold 21 is sealed with a jig 27, and the film B is positioned at a predetermined position on the upper surface of the cap base A1 and held by a holding frame.
The film B is heated and softened by the heater 26, and the opening / closing lid A2 portion and the hinge forming portion 24b are vacuum-sucked, and the film B is formed into the mold of the opening / closing lid A2 and the hinge forming portion 24 and mounted on the inner surface of the mold.

Next, the presser frame and the heater 26 are removed, a portion of the film B protruding from the vicinity of the opening / closing lid, and an unnecessary portion of the hinge portion B1 are cut and then clamped, and resin is pressed into the cavity to be molded.

Next, the operation and effect of the hinge type cap of the present embodiment will be described. Cap base A1 and open / close lid A
2 are connected by a film B and the connection acts like a hinge. At this time, the hinge portion B1 of the film B is deformed in cross section as a curved surface, so that a special hinge effect is not required as a material of the cap unlike a conventional hinge. Therefore, the material resin of the cap is not limited to PP, and any resin having a poor hinge effect can be used.

Also, since the hinge portion B1 is a film,
When opening and closing, the opening and closing lid A2 may be shaky,
At the time of closing the lid, the side peripheral wall 11 of the opening / closing lid A2 is positioned by engaging with the step portion 5, and at the time of opening the lid, the hinge B1 of the film B has a small peeling portion. Can be.

When decorating the cap, the film B
By printing on the opening / closing cover covering portion B2, various patterns can be formed. When printing is performed on the surface on the adhesion side of the film B, deep decoration can be obtained.

Next, a second embodiment will be described. In the present embodiment, in the hinge type cap of the previous embodiment,
The film to be adhered is only the hinge portion, and the shape and the method of attachment are changed. Regarding the configuration of the cap base, the opening / closing lid, and the attached film, portions having the same shape are denoted by the same reference numerals with a suffix a to simplify the description, and the following description will focus on the differences. .

In FIG. 5, Aa is a hinge type cap having a cap base A1a and an opening / closing lid A2a, both of which are continuously provided via a film Ba functioning as a hinge. The cap base A1a has a top wall 1a and a side peripheral wall 2a.
A pouring cylinder 4a having a hole a is provided upright, and the periphery is a step 5a.

On the lower surface of the top wall 1a, a sealing ring 6a which engages with the inner periphery of the container mouth and seals the inside of the container is vertically provided. On the inner periphery of the side peripheral wall 2a, a screw 7a that engages with a screw threaded on the outer periphery of the container mouth is screwed.

The opening / closing lid A2a includes a top wall 10a and a side peripheral wall 11a.
a on the lower surface of the top wall 10a.
A plug 13a for closing the space is vertically provided. The film Ba is
A side peripheral wall 2a of the cap base A1a;
A curved line 15A and a non-adhesive layer 16A are provided at the connection portion and adhered to the connection portion, similarly to the first embodiment, to form a hinge.

Next, a molding method will be described. Molding is performed using a mold having a split mold for the cap base A1a, a split mold for the opening / closing lid A2a, and a hinge forming portion, as in the first embodiment. The film Ba is placed between the cap base A1a and the opening / closing lid A across the hinge forming portion of the movable mold.
2a is attached to each side peripheral wall by suction and adsorption. Then the first
As in the embodiment, the movable mold and the fixed mold are clamped, and a resin is press-fitted into the cavity for molding.

Since the film Ba is a hinge, a special hinge effect is not required as a material of the cap, as in the first embodiment. Therefore, the material of the cap is not limited to PP, and the hinge effect is poor. Resins can also be used.

Next, a third embodiment will be described. In the present embodiment, a film is adhered to the upper surface of the top wall of the cap base together with the opening / closing lid in the hinge type cap of the first embodiment. About the structure of a cap base | substrate and an opening / closing lid, the part which is the same as that of 1st Embodiment is attached | subjected to the same code | symbol and added the suffix b, and description is simplified, and the following mainly demonstrates a difference. In FIG. 6, Ab
Is a hinge type cap, and a cap base A1b;
An opening / closing lid A2b is provided, and both are connected to each other via a film Bb having a hinge portion B1b.

The cap base A1b has a top wall 1b and a side peripheral wall 2b, and the top wall 1b has a pouring hole 3b at the center.
Is erected, and the periphery is a stepped portion 5b. On the upper surface of the top wall 1b, a pouring cylinder 4b is provided.
Except for the above, the annular covering portion B3b of the film Bb is adhered. On the lower surface of the top wall 1b, a sealing ring 6b that engages with the inner periphery of the container mouth and seals the inside of the container is vertically provided. On the inner periphery of the side peripheral wall 2b, a screw 7b that engages with a screw threaded on the outer periphery of the container mouth is screwed.

The opening / closing lid A2b includes a top wall 10b and a side peripheral wall 11a.
b on the lower surface of the top wall 10b.
A plug body 12b for closing is provided vertically. A dome-shaped covering portion B2b of the film Bb is adhered so as to cover the entire surface of the top wall 10b and the side peripheral wall 11b. A knob 13b is provided on the opposite side of the side peripheral wall 11b.

The film Bb is composed of the covering portion B3b and the covering portion B2b, and a hinge portion B1b connecting the both. As shown in FIG. 7, the hinge portion B1b has a fixed width, and a fixed length cut 30 extending toward the open / close lid A2b between the cover portion B2b and the cover portion B2b on the open / close lid side.
The portions a and b are engraved, and a portion surrounded by a curved line 31 a connecting the front ends of the cuts 30 a and b and the three points near the lower end surface of the center is a non-adhesive layer 32.

On the side of the cap base A1b, a portion extending from the edge of the annular covering portion B3b to the curved line 31b is:
The bent portion 33 is bonded to the side peripheral wall 2b of the cap base A1b and is bent at the curved line 31b. The bent portion 33 constitutes a hinge connecting portion together with the non-adhesive layer 32.

When the cover A2b is opened and closed, when the cover is closed, as shown in FIGS. 6 and 7, the hinge portion B1b is connected to the cap base A1b by the bent portion 33 and the side peripheral wall 2 as shown in FIGS.
b, but the film itself is thin, and the non-adhesive layer 32 is
b at the lower end surface and a gap 30 with the covering portion B2b.
Even if there are a and b, they are almost flush.

When the lid is opened, the bent portion 3 of the hinge portion B1b
3 is deformed under the influence of the curved line 31b, and the portion of the non-adhesive layer 32 is almost joined to the lower end of the opening / closing lid A2b at its center, but the joining point descends downward as it approaches both sides, At both ends, the junctions up to the ends of the cuts 30a and 30b are separated.

Next, a molding method will be described. The molding is performed by using a mold having a split mold for the cap base A1b, a split mold for the opening / closing lid A2b, and a hinge forming portion as in the first embodiment. In molding, first, the upper surface of the cap base A1b of the movable mold 21 is sealed with a jig 27, the film Bb is positioned at a predetermined position thereon, held by a holding frame, and the film 26 is heated and softened by the heater 26. Then, the opening / closing lid A2b and the hinge forming portion 24b are vacuum-sucked, and the film Bb is formed in accordance with the mold of the opening / closing lid A2b and the hinge forming portion 24b and mounted on the inner surface of the mold.

Next, the presser frame and the heater 26 are removed, and the protruding portion of the film Bb from the vicinity of the opening / closing lid, the protruding portion of the cap base A1b, the perforation of the pouring cylinder portion, and the unnecessary portion of the hinge portion B1b are cut. Tighten,
The resin is pressed into the cavity and molded. At this time, the film covering portion B3b on the upper surface of the cap base A1b is joined to the split mold surface of the fixed mold, molded as the mold surface, and adhered to the resin.

Next, the operation and effect of this embodiment will be described. The hinge type cap of this embodiment can obtain the same effect as that of the first embodiment, but furthermore, the film Bb is formed on the upper surface of the cap base A1b. Has the effect that the cap base A1b can be decorated.

Next, another embodiment of the hinge will be described.
In the second embodiment, the hinge is formed by only one film, but a connecting piece may be provided on both sides of the hinge to form a three-point hinge. In FIG. 8, 35 is a cap base A1.
Hinges 36a and 36b formed by a film connecting the opening and closing lid A2c to the opening / closing lid A2c are connecting pieces disposed outside the hinge. The connecting pieces 36a and 36b are bonded to the opening / closing lid A2c and the cap base A1c above and below the boundary lines 37a and 37b, respectively, and the intermediate portion 38 is a non-adhesive layer. Connecting piece 3
6a and 6b, the opening / closing lid A2c can be opened and closed.
Stability can be increased.

Next, a fourth embodiment relating to a compact will be described. In FIG. 9, C is compact, C1 is a case main body, C2 is an opening / closing lid, and one common film Bc is adhered to the surfaces of the case main body C1 and the opening / closing lid C2. The case body C1 has a bottom wall 40.
And a side peripheral wall 41, and a protruding portion 42 is provided upright on the upper end surface of the side peripheral wall 41 along the inner peripheral edge. A notch 43 is formed on the side of the side peripheral wall 41 opposite to the hinge portion,
A locking piece 44 is provided inside.

The opening / closing lid C2 comprises a top wall 45 and a side peripheral wall 46. On the side of the side peripheral wall 46 opposite to the hinge portion, there is provided a retaining piece 47 which engages with the retaining piece 44 of the case body C1. Pick 4
8 are provided.

As shown in FIGS. 10 and 11, the film Bc
Is a dome-shaped covering portion B2 covering the surface of the case body C1.
c, a dome-shaped covering portion B3c covering the surface of the opening / closing lid C2, and a hinge portion B1c connecting the two covering portions B2c, B3c. The hinge portion B1c has a fixed width, and cuts 50a, b, 51a, and b having a fixed length extending along both sides toward the covering portions B2c and B3c.

On the case body C1 side, the hinge portion B1c has an end face of the side peripheral wall 41 of the case body C1, a tip end of the cuts 50a and 50b on both side ends, and a curved line 52 connecting three points near the end face of the center portion. The portion surrounded by is defined as a non-adhesive layer 53a, and a non-adhesive layer 53b is provided on the side of the open / close lid C2 symmetrically with the case body C1. The length L of the connecting portion in the cross section orthogonal to the hinge axis of the hinge portion B1c is twice as long as the distance h from the upper and lower end surfaces of each side wall to the curved line.

Next, a compact molding method will be described. First, the molding die will be described.
Reference numeral 60 denotes a fixed mold, 61 denotes a movable mold, and the split dies 62a and 62b for the case body C1 and the split dies 6 for the open / close lid C2.
3a and 3b and hinge forming portions 64a and 64b. 65
Is a heater.

The molding is performed first by using a predetermined film B
c is placed at a fixed position of the movable mold 61 and fixed with a holding frame. Next, the film B is heated by the heater 65 and
Then, the film Bc is softened and suctioned, and the film Bc is molded into the case body C1, the open / close lid C2, and the hinge portion B1c according to the mold, and is mounted on the inner surface of the mold.

Next, the holding frame and the heater 65 are removed, the movable mold 61 and the fixed mold 60 are clamped, and the resin is pressed into the cavity to be molded.

Next, the operation and effect of the compact of this embodiment will be described. Film B as in the above embodiments
The connection of c acts like a hinge. At this time, the hinge portion B1c of the film Bc has a cross section deformed as a curved surface in the same manner as described above, so that a special hinge effect is not required as a material of the cap unlike a conventional hinge. Therefore, the material resin of the cap is not limited to PP, and a resin having a poor hinge effect can be used.

Further, since the hinge portion B1c is a film, when opening and closing, the side peripheral wall 46 of the opening and closing cover C2 is positioned by engaging with the projection 42 when the cover is closed, and the hinge of the film Bc is also opened when the cover is opened. Since the non-adhered portion of the portion B1c is slight, a fixed position can be maintained.

In decorating the compact, various patterns can be formed by printing on the entire film Bc. By printing on the bonding side of the film, deep decoration can be obtained.

In the fourth embodiment, the film Bc is adhered to the surfaces of the case body C1 and the opening / closing lid C2. However, as in the second embodiment, the film is attached to the hinge B1c.
Only the hinge B1 of the case body C1 and the opening / closing lid C2
In-mold molding may be performed so as to adhere to a predetermined surface of c. As for the decoration, only the printing may be performed only on the surface of the opening / closing lid C2.

Although the hinge type cap and the compact have been described in the above embodiments, a synthetic resin container having a hinge mechanism can be formed by insert-molding a film in the hinge portion and using the film as a hinge. It is not limited to. In particular, when applied to a synthetic resin container having a case main body and an opening / closing lid attached to the case main body via a hinge and having an elliptical cross section, or a synthetic resin container having a circular side edge, The same effects as the effects of the embodiment can be obtained.

[0053]

Since the present invention is configured as described above, it has the following effects. By in-molding the film on the hinge part of the container, it is bonded to a predetermined position to form a hinge, so that a material other than PP can be used for the molded product, and printing on the in-mold film Thereby, the decoration effect can be enhanced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a hinged cap according to a first embodiment.

FIG. 2 is a diagram showing the hinged cap in an open state,
(A) is a partial cross-sectional front view, and (b) is a top view.

FIG. 3 is a detailed explanatory view of a hinge in an open state, and FIG.
3B is a top view, FIG. 3B is a front view, and FIG. 3C is a cross-sectional view taken along line AA in FIG.

FIG. 4 is an explanatory diagram of molding.

FIG. 5 is an explanatory view of a hinge cap according to a second embodiment;
(A) is a partial cross-sectional front view when the lid is closed, (b) is a partial cross-sectional front view when the lid is opened, and (c) is an explanatory view of a hinge part film.

FIG. 6 is an explanatory view of a hinge type cap according to a third embodiment;
(A) is a partial cross-sectional front view when the lid is closed, (b) is a partial cross-sectional front view when the lid is opened, and (c) is an explanatory view of a hinge part film.

FIG. 7 is a detailed explanatory view of a hinge in an open state, and FIG.
3B is a top view, FIG. 3B is a front view, and FIG. 3C is a cross-sectional view taken along line AA in FIG.

FIG. 8 is an explanatory view of a hinge mechanism of a three-point hinge.

FIG. 9 is a sectional front view of a compact according to a fourth embodiment.

FIGS. 10A and 10B are diagrams showing a state at the time of opening the cover, in which FIG. 10A is a partial cross-sectional front view, and FIG.

FIG. 11 is a detailed explanatory view of a hinge in an open state;
(A) is a top view, (b) is a front view, (c) is A of (b)
It is sectional drawing in the -A line.

FIG. 12 is an explanatory diagram of molding.

[Explanation of symbols]

A, Aa, Ab Hinge-type cap A1, A1a, A1b, A1c Cap base A2, A2a, A2b, A2c Opening / closing lid B, Ba, Bb, Bc Film B1, B1a, B1b, B1c Hinge B2, B2a, B2b, B3b , B2c, B3c Covering part C Compact C1 Case body C2 Opening / closing lid 1, 1a, 1b Top wall 2, 2a, 2b Side peripheral wall 10, 10a, 10b Top wall 11, 11a, 11b Side peripheral wall 14a, b, 30a, b, 50a, b, 51a, b Cut 15a, b, 15A, 31a, b, 52 Curved line 16a, b, 16A, 32, 53a, b Non-adhesive layer 20, 60 Fixed mold 21, 21a, 61 Movable mold 22a , B, 23a, b Split mold 24a, b, 64a, b Hinge forming part 25 Movable core 26, 65 Heater 27 Jig 35 Hinge 36a, Connecting pieces 37a, b boundary 38 intermediate portion 40 bottom wall 41 side wall 45 top wall 62a, b, 63a, b split 66 side wall

Claims (11)

[Claims] 1. A hinge-type cap comprising a cap base and an opening / closing lid attached to the cap base via a hinge, wherein the hinge is provided at a predetermined position on a side peripheral wall of the cap base and a side peripheral wall of the opening / closing lid. A hinge-type cap formed by a film adhered by in-mold molding. 2. The hinge-type cap according to claim 1, wherein the film is adhered to a predetermined position of the side peripheral wall of the cap base and to the entire surface of the opening / closing lid. 3. The hinge-type cap according to claim 1, wherein the film is adhered to a predetermined position of the side peripheral wall of the cap base, the top wall, and the entire surface of the opening / closing lid. 4. The hinge is formed as a three-point hinge by a predetermined position on a side peripheral wall of the cap base and a side peripheral wall of the opening / closing lid, and a film bonded by in-mold molding to predetermined positions on both sides thereof. Claim 1 characterized by the following:
A hinged cap as described. 5. A compact comprising a case main body and an opening / closing lid attached to the case main body via a hinge, wherein the hinge is inserted into predetermined positions of a side peripheral wall of the case main body and a side peripheral wall of the opening / closing lid. Compact, characterized by being formed by a film adhered by molding. 6. The compact according to claim 5, wherein the film is bonded to the entire surface of the case body and the opening / closing lid. 7. A synthetic resin container having a case main body and an opening / closing lid attached to the case main body via a hinge, and having an elliptical cross section, wherein the hinge comprises a side peripheral wall of the case main body, A container formed by a film adhered to a predetermined position of a side peripheral wall of an opening / closing lid by in-mold molding. 8. The container according to claim 7, wherein the film is adhered to a predetermined position of the side peripheral wall of the case main body and to the entire surface of the opening / closing lid. 9. The container according to claim 2, wherein a pattern is printed on a covering portion of the film adhered to the opening / closing lid. 10. The compact according to claim 6, wherein a pattern is printed on a covering portion of the film that is bonded to both the case body and the opening / closing lid. 11. The container according to claim 1, wherein the film is a stretched film of PET, PE, AS, or PS.