JPH05201440A - Lid body for container - Google Patents

Abstract

PURPOSE: To mold a closure unit by a multi-material injection molding method, and to make only one out of the materials contact a fluid. CONSTITUTION: A closure unit consists of a pouring part 11 and a closure part 13 for opening and closing a pouring mouth, and has a region comprising two materials A and B of different properties. The pouring part 11 and the closure part 13 are pivotably connected by a hinge 14, and the hinge 14 has at least one bearing 21 formed in one of the pouring part 11 and the closure part 13, and in each bearing 21 a pivotal part 22 formed in the other of the pouring part 11 and the closure part 13 is pivotably provided. And, the bearing 21 is formed with one material A, and the pivotal part 22 is formed with the other material B. The pivotal part 22 is covered by material A of the bearing 21 in the contacting region with the fluid. Therefore, the fluid contained in the container has no chance of contacting the other material B composing the pivotal part 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lid of a container.

[0002]

2. Description of the Related Art Conventionally, in a container formed of, for example, a metal can or a cardboard whose inside is coated with a fluid such as a liquid, a lid is provided so that the spout can be repeatedly opened and closed. The lid includes a spout portion having a spout and a lid portion that opens and closes the spout. The lid is used by being fitted into an opening formed in the container, and a thermoplastic material is used as the material (Swiss patent application No. 2739 / 91-2).
No. and Swiss Patent Application No. 2740 / 91-9 (filed Sep. 17, 1991).

The lid body is formed by a multi-material injection molding method using two or more materials having at least one characteristic different from each other. The Swiss patent application No. 2740 / 91-
In the lid described in No. 9, the lid is not completely separated from the spout even when the spout is opened in order to facilitate handling when the lid is normally used. It is like this. Therefore, one or two or more webs are formed in the lid part, and the web is made flexible to connect the lid part and the spout part, or
The lid and the container are connected.

[0004]

However, in the conventional lid of the container, since the spout or the part between the container and the lid is connected by the web, the position of the lid when the spout is opened is changed. I can't stabilize. Therefore, before the operation of closing the spout with the lid portion, the operation of aligning the position of the lid portion with the spout portion is necessary. As a result, the swing of the lid portion deforms the web, and this deformation causes the web to be rapidly fatigued and damaged. Therefore, in order to prevent the fatigue and breakage of the web, it is conceivable to form the web with a highly flexible material or to thin the web.

However, the web needs to be formed of the same material as that of the lid portion, particularly, the outside of the lid portion, and it is not preferable to limit the material to increase flexibility.
Further, if the web is made too thin, it tends to be damaged when a tensile force is applied, resulting in a decrease in durability. Further, the conventional lid body made of one material also has a web connecting the spout portion and the lid portion. The lid is manufactured with the spout open, and the spout is closed before or after being attached to the container. Therefore, the number of manufacturing steps increases accordingly.

Furthermore, in some countries, especially in the field of food chemistry, the packaging materials which can be brought into contact with the products to be contained, for example fluids, are limited to certain thermoplastic materials.
For example, milk is only allowed to come into contact with polyethylene. When the lid is manufactured by the multi-material injection molding method, the fluid must be brought into contact with only one of the plurality of materials.

The present invention solves the above-mentioned problems of the lid of the conventional container, and a container which is molded by a multi-material injection molding method and in which only one of the materials can be brought into contact with the fluid. The purpose is to provide a lid.

[0008]

Therefore, in the lid of the present invention, the lid is used for a container for containing a fluid and is made of a thermoplastic material. Further, it has a substantially cylindrical spout portion and a lid portion that opens and closes the spout of the spout portion, and has an area made of at least two materials having at least one characteristic different from each other.

The spout portion and the lid portion are swingably connected by a hinge, and the hinge has at least one bearing portion formed on one of the spout portion and the lid portion. Then, in each of the bearing portions, a swinging portion formed on the other of the spout portion and the lid portion is swingably arranged. Further, the bearing portion is formed of one material, the oscillating portion is formed of another material, and the oscillating portion is covered with the material of the bearing portion in a contact area with the fluid.

Further, at least one of the preset break point and expansion point can be provided in at least one of the hinge area and the separation area. In addition, two materials of the bearing portion and the swing portion,
A connection can be made in the lid part, the connection between the two materials in the lid part being made by gluing or mold locking means.

[0011]

According to the present invention, as described above, the lid is used for the container for containing the fluid and is made of a thermoplastic material. Further, it has a substantially cylindrical spout portion and a lid portion that opens and closes the spout of the spout portion, and has an area made of at least two materials having at least one characteristic different from each other.

The outlet portion and the lid portion are swingably connected by a hinge, and the hinge has at least one bearing portion formed on one of the outlet portion and the lid portion. Then, in each of the bearing portions, a swinging portion formed on the other of the spout portion and the lid portion is swingably arranged. Further, the bearing portion is formed of one material, the oscillating portion is formed of another material, and the oscillating portion is covered with the material of the bearing portion in a contact area with the fluid. Therefore, the fluid contained in the container does not come into contact with another material forming the oscillating portion.

At least one of the preset break point and expansion point can be provided in at least one of the hinge area and the separation area. When at least one of the breaking point and the expanding point is broken (or expanded), the rocking portion can rock. Then, when the pouring port is closed, the fractured part is closed again, so that the fluid does not come into contact with another material forming the oscillating portion.

Further, the two materials of the bearing portion and the swinging portion can be connected to each other in the lid portion, and the connection between the two materials in the lid portion is performed by adhesion or die locking means. .. Therefore, also in the lid portion, the fluid contained in the container does not come into contact with another material forming the swinging portion.

[0015]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 is a sealed state view of a lid of a container showing an embodiment of the present invention, and FIG. 2 is a plan view of a lid of a container showing an embodiment of the present invention. In the figure, 10 is a lid formed of a thermoplastic material, 11 is a spout portion having a cylindrical or polygonal tubular shape, that is, a substantially tubular shape,
In the case of this embodiment, it has a pentagonal tubular shape. Also, 12
Is a forming edge or knife edge, 13 is a lid portion for opening and closing the spout of the spout portion 11, 14 is a hinge, A
Is a first material, B is a second material, 21 is a bearing portion, and 22 is a rocking portion. It is shown that the bearing portion 21 and the swing portion 22 are made of different materials. Swing unit 2 shown in FIG.
No material distribution is shown on the surface of 2.

FIG. 3 is a sectional view of a bearing portion in the lid of the container showing the embodiment of the present invention. In the figure, the bearing portion 21 made of the first material A extends along the swinging portion 22 made of the second material B to form the lid portion 13.
Then, a breaking point (or an expanding point) 18 is provided in order to form a hinge structure by the bearing portion 21 and the swinging portion 22 so as to have a function of a fulcrum. When the breaking point (or expansion point) 18 is broken (or expanded), the rocking portion 2
2 becomes swingable. In the case of expansion, polyethylene is used as the first material A, for example. The degree of expansion of the polyethylene is about 8 times the thickness of the material.

The above two Swiss patent applications No. 2739/9
1-2 and Swiss Patent Application No. 2740 / 91-
As shown in the specification No. 9, the lid 10 is manufactured in a hermetically sealed state, and mounted in a container in that state. The pair of sealing surfaces required between the spout portion 11 and the lid portion 13 is formed by the contact surfaces made of two different materials. In this case, the two different materials are chosen such that they can be separated from each other without being strongly welded to each other.

The breaking point (or expansion point) 18 is broken (or expanded) when the spout is first opened, that is, when the lid 10 is opened, and is not broken (or expanded) during the storage period of the fluid. Lid 1 having the breaking point 18
When opening 0 (FIG. 1), a small gap is formed in the region of the first material A towards the second material B, which is located above the position of the fluid and thus the second gap. Material B does not contact the fluid. When closing the spout, the breaking edges of the breaking point 18 are pressed against each other,
The fluid is separated from the material B in (1) to prevent the fluid from contacting the second material B.

A break groove is formed by injection molding to facilitate breakage. For example, the two materials A and B which do not move relative to each other like the zone F are connected by an adhesive or a mold locking means. In the zone G, the two materials A and B are relatively moved by rocking the lid portion 13. The amount of the second material B melted or mixed with the first material A already molded during the injection molding changes depending on the type of thermoplastic material used and the characteristics of energy. Therefore, by changing the combination of the two materials A and B or controlling the energy applied in the molding process, it is possible to form a contact surface having different characteristics between the two materials A and B.

For example, the two materials A and B can be melted and strongly fused to each other, easily adhered to each other, or easily brought into contact with each other without adhering. By slightly modifying this injection molding process, the swinging part 22
An integral coating can be formed on the. By the way, the lid body 10 is manufactured by a multi-material injection molding method, and in the first molding step, a preform is molded with the first material A,
In the next second molding step, the mold is at least partially moved, and the second material B is molded into the final molded product. In the second molding step, at least a portion of the preform constitutes a mold.

FIG. 4 is a view showing a film hinge of a lid of a container according to another embodiment of the present invention. In the multi-material injection molding method, pressure can be applied to the preform by advancing the mold in the second molding step, and the preform is slightly deformed by the mold in the second molding step. It will be possible. By deforming in this way, the hot first
The structure of the material A can be changed to orient the molecules, for example. When a predetermined thermoplastic material is used, the flexibility can be increased, and the film hinge 1
It is possible to suppress the occurrence of cracks in 4a.

That is, since the hinge zone obtained in the first molding step has a relatively large thickness, it is not suitable for the hinge zone of the final molded product. Then, when the preform is sufficiently cooled, the mold is replaced with a new mold.
In the next second molding step, the final molded product is molded from the second material B. The hinge zone is then formed by a fixed mold on the inside and a new mold on the outside. Since the new outer mold has a shape that does not correspond to the hinge zone of the preform, it pressurizes the hinge zone. In the second molding step, at least a part of the preform forms a molding die.

In this embodiment, the layer of the first material A, which is tapered towards the film hinge 14a, is again thickened to form the lid portion 13. In this embodiment, there is no need to provide break points 18 (FIG. 3) because a thin hinge zone is provided along the swing axis. Then, the two materials A and B in the lid portion 13 are connected by an adhesive or die locking means 17.

FIG. 5 is a sectional view of the lid of the container showing still another embodiment of the present invention. As shown, in the vicinity of the hinge 14, the layer of the first material A is reinforced. The same applies to the opposite side of the hinge 14, and the layer of the first material A is formed on the first material A of the bearing portion 21 via the swing portion 22 (FIG. 3).
Is connected with. At this connecting portion, a separation area, that is, a zone H where the bearing portion and the swinging portion are separated is formed.

In this way, the breakage points (or expansion points) 18 are formed on both sides, break (or expand) when opened for the first time, and the breakage points 18 occur as the lid portion 13 is closed.
Is closed again, so that the second material B of the rocking portion and the fluid are separated. FIG. 6 is an enlarged view of the fractured part shown in FIG. As shown in the figure, when opened, the breaking point 18 is broken by the film hinge as much as necessary.
Thickness is automatically obtained. Set break point 18
Is also broken along the knife edge 12 (FIG. 2) so that when reclosed it will be tightly pressed and resealed.

The present invention is not limited to the above-mentioned embodiments, but can be variously modified within the scope of the present invention, and they are not excluded from the scope of the present invention.

[0027]

As described in detail above, according to the present invention, the lid of the container comprises a substantially cylindrical spout and a lid for opening and closing the spout of the spout. At least one region has at least two materials having different properties. The spout portion and the lid portion are swingably connected by a hinge, and the hinge has at least one bearing portion formed on one of the spout portion and the lid portion. Then, in each of the bearing portions, a swinging portion formed on the other of the spout portion and the lid portion is swingably arranged.

The bearing portion is made of one material, the oscillating portion is made of another material, and the oscillating portion is covered with the material of the bearing portion in the contact area with the fluid. Therefore, the fluid contained in the container does not come into contact with the other material forming the oscillating portion, and the range of selection of the other material forming the oscillating portion is widened, and the cost can be reduced. it can.

Then, at least one of the preset break point and expansion point can be provided in at least one of the hinge region and the separation region. When at least one of the breaking point and the expanding point is broken (or expanded), the rocking portion can rock. In addition, two materials of the bearing portion and the swing portion,
It is possible to connect at the lid part and between the two materials in the lid part is done by gluing or mold locking means. Therefore, also in the lid portion, the fluid contained in the container does not come into contact with another material forming the swinging portion.

[Brief description of drawings]

FIG. 1 is a view showing a sealed state of a lid of a container according to an embodiment of the present invention.

FIG. 2 is a plan view of the lid of the container showing the embodiment of the present invention.

FIG. 3 is a cross-sectional view of a bearing portion in the lid of the container showing the embodiment of the present invention.

FIG. 4 is a view showing a film hinge of a lid of a container showing another embodiment of the present invention.

FIG. 5 is a sectional view of a lid of a container showing still another embodiment of the present invention.

FIG. 6 is an enlarged view of a broken portion shown in FIG.

[Explanation of Codes] 10 Lid 11 Pouring Out Port 13 Lid 14 Hinge 14a Film Hinge 18 Breakage (Expansion) 21 Bearing 22 Swing A, B Material G, H Zone

Claims (5)

[Claims] 1. A container lid used for a container for containing a fluid and formed of a thermoplastic material, comprising:
(A) a substantially cylindrical spout portion, (b) a lid portion that opens and closes the spout of the spout portion, and (c) an area made of at least two materials having different characteristics. (D) the spout and the lid are swingably connected by a hinge, and (e) the hinge has at least one bearing formed on one of the spout and the lid. (F) In each of the bearing portions, a swinging portion formed on the other of the spout portion and the lid portion is swingably disposed, and (g) the bearing portion is formed of one material, The lid of a container, wherein the oscillating portion is formed of another material, and (h) the oscillating portion is covered with the material of the bearing portion in a contact area with the fluid. 2. The container lid according to claim 1, wherein at least one of the preset break point and expansion point is provided in at least one of the hinge region and the separation region. 3. The container lid according to claim 1, wherein the two materials of the bearing portion and the swinging portion are connected at the lid portion. 4. The lid of a container according to claim 3, wherein the connection between the two materials in the lid portion is by adhesion. 5. The lid of a container according to claim 3, wherein the connection between the two materials in the lid portion is by means of mold locking means.