JPH072243A - Synthetic resin container for food packaging and its manufacture - Google Patents

Abstract

PURPOSE:To provide a novel synthetic resin container and a method for manufac turing it for which waste materials are considerably utilized and yet the inside of the container is visible from outside and a special consideration is given to the joining part between the lid and the holding part. CONSTITUTION:A container consists of a lid A having projections and hollows three-dimensionally as required and a holding part B having projections and hollows three-dimensionally as required with a joining part C integrally joining the lid A and the holding part B. The lid A is formed of a sheet of synthetic resin (1) which is formed of a new material and has a high transparency. The holding part B is formed of a sheet of synthetic resin (2) which is formed from waste materials and whose transparency is low. The joining part C is formed by bringing together flat marginal parts each of one side of the synthetic resin (1) or the synthetic resin (2) forming the lid A and the holding part B respectively and making a strip of tape of synthetic resin 10 with a suitable breadth adhered to both the flat marginal parts by polymerization. Consequently to the two side parts along the joining part C bending ribs 6, 6 are formed in the lid A and the holding part B respectively to make there bendable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is for packaging foods such as eggs, tofu, meats and seafood for transportation and distribution such as exhibition and sale. Is a container in which a lid and a body of the container are formed so as to be openable and closable, and the lid is formed of a highly transparent synthetic resin sheet formed of a new material, and the body is a waste material. TECHNICAL FIELD The present invention relates to a synthetic resin container for food packaging, which is formed of a synthetic resin sheet having low transparency formed by using, and allows the inside of the container to be seen through from a lid portion, and a manufacturing method thereof.

[0002]

2. Description of the Related Art From the viewpoint of waste disposal and effective use of resources,
It has been demanded to collect and recycle the synthetic resin food container, and the applicant of the present invention responded to this by first taking into account
The invention disclosed in Japanese Patent No. 43132 is proposed.
However, in this prior invention, the synthetic resin sheet made of waste material has a low transparency due to the inclusion of foreign matters and printing ink, and also has a slightly colored opaque property, so that the content see-through effect is Has the drawback of being bad. Therefore, in consideration of this point, the applicant has formed the lid part of the container with an opaque sheet material, the body part with a transparent sheet material, and both of them are polymer-welded so that they can be folded at the flange part. A proposed container was proposed in Japanese Examined Patent Publication No. 39745. In this container, the joint portion of the lid portion and the body portion, which are welded together by polymerization, is formed thin and curved so as to be bendable.

[0003]

However, in such a prior invention, the fusion head must be pressed until the connecting portion becomes thin enough to be bendable, so that it takes time and the flow of the production line is increased. Since the lid part is opened and closed with this thinned connecting part as it is slowed down, it is peeled off to the unfused edge part of the flange piece polymerized by the pulling or bending action that occurs during opening and closing. There is a problem that a phenomenon occurs and the appearance becomes ugly.

In view of the above-mentioned conventional technique, a first object of the present invention is to form a synthetic resin sheet material of a new material having a high transparency only on the lid, and to make the body a synthetic resin having a low transparency due to a waste material. By forming it with a sheet, it is possible to easily check the state of the food stored inside the container from the outside while aiming to effectively use the waste material, and at the connecting part between the lid part and the body part. It is an object of the present invention to provide a container in which the manufacturing time can be shortened, the flow of the production line can be smoothly advanced, and the appearance of the container is not damaged by adding consideration.

Further, a second object of the present invention is such a container, but in the production thereof, the efficiency is the same as in the case of producing the container by using a raw material sheet made of only a new material for the entire container. An object of the present invention is to provide a novel manufacturing method that can be manufactured well.

[0006]

In order to achieve the above-mentioned first object, a synthetic resin container for food packaging according to the present invention has a lid (A) having a required uneven three-dimensional shape and a required three-dimensional shape. A container in which a body (B) having an uneven three-dimensional shape is integrally connected by a connecting part (C), and the lid part (A) is made of a new material and has a high transparency. (1), the body (B) is made of a low transparency synthetic resin sheet material (2) formed by using waste material, and the connecting portion (C) is a lid portion.
The synthetic resin materials (1) and (2) that form (A) and the body (B) are butt-joined with the flat side edge portions of the synthetic resin material (1) and (2), respectively, and a strip-shaped composite having an appropriate width is spread over these flat side edge portions. It is formed by polymerizing and adhering a resin tape (10) and is adjacent to both side portions along the width direction of the connecting portion (C), the lid portion (A) and the body portion.
The structure is such that the foldable ribs (6) and (6) are formed in (B).

Furthermore, in the present invention, the synthetic resin tape (10) at the connecting portion (C) is joined by a peelable adhesive force, and one end portion of the synthetic resin tape (10) is slightly separated from the edge of the connecting portion of the container. (EN) Provided is a synthetic resin container having a structure in which a knob portion (11) is formed in an extended or non-adhered state.

The manufacturing method of the present invention for achieving the second object is a strip-shaped synthetic resin sheet material (1) having a high transparency formed by using a new material and a low transparency formed by using a waste material. A process of arranging the strip-shaped synthetic resin sheet material (2) side by side in parallel, and forming the required concavo-convex shape on these synthetic resin sheet materials (1) and (2) and along the side edges adjacent to each other A step of forming bent ribs (6) and (6) while leaving flat adhesion margins (5a) and (5b) between the edges and the side of the synthetic resin sheet materials (1) and (2). Aligning the edges with each other aligned and adhering a strip-shaped synthetic resin tape (10) with an appropriate width across both adhesive margins (5a) and (5b), and an uncut container continuously molded in this way The forming band-shaped body (8) is cut into a single container (K).

The synthetic resin sheet material (1) using the new material and the synthetic resin sheet material (2) using the waste material referred to in the present invention are formed separately or by extrusion from one synthetic resin extruder. Are continuously transferred to the processing step, or those formed in advance are supplied to the processing step. The sheet-shaped material extruded from the extruder can be made into a material having high strength for its thickness by adding a stretching step and stretching. In this case, it is preferable to make the extrusion thickness from the die in the extruder thicker in consideration of the fact that the original sheet becomes thinner in the stretching step.

[0010]

[Function] In the container constructed as described above, only the lid portion (A) is made of a new synthetic resin sheet material having a high transparency, and the body portion (B) is made of a low transparency synthetic resin sheet made of a waste material. As a result, it is possible to obtain a container similar to the new material, which enables effective utilization of the waste material and allows the state of the stored food inside the container to be easily seen through from the outside. Also, the connecting part (C) between the lid part (A) and the body part (B)
Bending ribs (6) and (6) are formed on the lid part (A) and the body part (B) adjacent to both side parts along the width direction of
The lid (A) is opened and closed via the bending ribs (6) and (6), and the pulling force and bending repulsive force generated during rotation are less likely to be directly applied to the connecting portion (C). It is possible to prevent the strip-shaped synthetic resin tape (10) in the portion (C) from peeling off or the non-adhesive portion being turned up and impairing the appearance of the container. In addition, synthetic resin tape (10)
The adhesive strength of the synthetic resin tape (10) is weakened so that it can be peeled off, and one end of the synthetic resin tape (10) is slightly extended from the edge of the connecting portion of the container or is not adhered to form the knob portion (11). If so, the lid portion (A) can be easily opened by pinching the knob portion (11) and peeling the synthetic resin tape (10).

[0011]

EXAMPLES A method for manufacturing a container according to the present invention will be described below based on the examples shown in FIGS. 1 to 9. From the two horizontal die (D1) (D1) of the synthetic resin extruder, molten colorless transparent new material polystyrene resin is extruded, and two unstretched new synthetic resin sheet materials with a small width and high transparency (1) (1) is extruded into a strip shape. From another wide die (D2) arranged between these dies (D1) (D1), molten opaque waste material polystyrene resin is extruded, and wide and opaque unstretched waste material synthetic resin sheet material (2 ) Is extruded into a strip shape. In this example, the new synthetic resin sheet material (1)
The width of (1) is 1 in the length direction when the lid (A) of the molded container is
The width of the waste synthetic resin sheet material (2) is set so that it can be molded sequentially in a line, and the width of the container body (B) to be molded
Are set to a dimension that allows them to be sequentially molded in a state of being arranged in two rows in the length direction. The sheet materials (1) and (2) extruded from these dies are drawn by the drawing rollers (3a) and (3b) to a predetermined thickness, for example, a thickness of about 0.25 mm, and sent to the molding machine (4).

The sheet materials (1), (1) and (2) sent to the molding machine (4) are formed with irregular shapes corresponding to the lid (A) and body (B) of the container, respectively. At the same time as this molding, the sheet material
(1) and the sheet material (2) at the side edge portions opposite to each other, a flat bonding margin portion (5a) (5b) for forming a connecting portion (C),
At the base ends of the flat adhesive margin portions (5a) (5b), foldable bending ribs (6) (6) along the adhesive margin are formed.
The molding machine (4) consists of a pair of upper and lower molds (4a) (4b) for vacuum forming or blow molding, and both molds open and close while moving synchronously along the sheet material advancing direction. The molding operation is performed by repeating the operation of returning to the original position.

Next, the sheet materials (1), (1) and (2) on which the required concavo-convex shape is formed are aligned so that the adjacent flat bonding margin portions (5a) and (5b) are butted against each other. ,
To the space between the upper and lower bonding rollers (7a) and (7b), where the belt-shaped synthetic resin tapes (10) of appropriate width are overlapped on the lower surfaces of the adhesive margins (5a) and (5b). Then, these are fusion-bonded to each other to form a connecting portion (C). In this embodiment, the upper joining roller (7a) is formed by two thin flat gears so that the two rows of aligned spot joining arrangements as shown in FIG. By changing the shape of the joining roller (7a), it is possible to perform fusion bonding in a staggered arrangement as shown in FIG. 4, a continuous horizontal line arrangement as shown in FIG. 5, or a two-row linear arrangement. It is also possible, and further, by forming the upper and lower joining rollers on flat surfaces, it is possible to adhere them over the entire surface.

Finally, the thus-formed uncut container strip (8) is transferred to the cutting machine (9) to cut between the individual containers of the container group connected in the transverse direction and the traveling direction. And separate it into a single container (K). The cutting machine (9) is composed of a blade die and a receiving die, but may be a high-frequency fusing type or other type. Separated individual container (K)
Are sent to a packing device through a chute, a transfer conveyor, and the like (not shown), and are packed in a predetermined number of boxes.

In the present embodiment, two rows of containers are shown as being molded at the same time, but the number of molding rows of containers is two.
It does not have to be a row at all, it may be at least one row, 2
Needless to say, the molding can be performed in an appropriate number of rows or more, for example, three rows or five rows, which corresponds to the size of the manufacturing apparatus.

FIG. 8 shows an example of a container manufactured by the above method. The container of the embodiment shown here is shaped to accommodate 5 eggs × 2 rows = 10, but of course the number is not specified.
As shown in FIG. 1, it may be formed in such a shape as to store 3 eggs × 2 rows = 6 eggs. The container is a lid part (A) made of a highly transparent synthetic resin sheet material (1) formed by using a new material.
And a body (B) formed of a synthetic resin sheet material (2) having low transparency formed by using a waste material are connected by a connecting portion (C). This connecting portion (C) is a flat side edge portion of each of the synthetic resin materials (1) and (2) forming the lid portion (A) and the body portion (B),
That is, the adhesive margin portions (5a) and (5b) are butted against each other, and the strip-shaped synthetic resin tape having an appropriate width is spread over these flat adhesive margin portions.
It is formed by polymerizing and adhering (10). Further, a bending rib which can be bent to the lid portion (A) and the body portion (B) adjacent to both side portions along the width direction of the connecting portion (C)
(6) and (6) are formed.

The synthetic resin tape (10) is joined by a peelable adhesive force, and one end portion of the synthetic resin tape (10) is connected to the container (C) as shown in FIGS. 4 and 5. It is preferable to form the knob portion (11) by extending a little from the end edge of the, or by forming the non-adhesive portion (12) as shown in FIG. As a result, as shown in FIG. 9, by gripping the knob portion (11) and peeling off the synthetic resin tape (10), the lid portion (A)
Can be easily opened. Incidentally, as shown in FIG. 5, it is preferable that the edge portion of the connecting portion (C) is slightly cut and the knob portion (11) is arranged in this cut portion (13).

In the container shown in FIG. 8, when the lid (A) is closed, the contacting step portions (14) (14) formed on the opposite surfaces of the lid (A) and the body (B) are provided. Although it is formed so as to abut and close in a parallel posture, as shown in FIGS.
The tip of (A) may be formed so as to be closed in a tilted state so that the tip end thereof is in a lower tilted position.

The representative embodiments of the present invention have been described above, but the present invention is not necessarily limited to the structures of the above embodiments. For example, by making the uneven shape of the molding machine (4) different, the lid portion (A) and the body portion (B) can be made into an uneven shape suitable for accommodating other foods. . Further, the joining of the connecting portion (C) is not limited to the method of heat fusion using the joining roller described above, and may be a joining means using high frequency, ultrasonic waves or laser. In addition, it is needless to say that the present invention can be appropriately modified and implemented within a range that has the constituent features and has an effect.

[0020]

As is apparent from the above description, in the container of the present invention, only the lid (A) is made of a highly transparent new synthetic resin sheet material, and the body (B) is made of waste material. By forming a synthetic resin sheet with low transparency, it is possible to effectively utilize the waste material, but to obtain a container similar to the new material that allows the state of food stored inside the container to be easily seen from the outside. be able to. Also, the lid
Bending ribs (6) on the lid (A) and the body (B) adjacent to both sides along the width direction of the joint (C) between the body (A) and the body (B)
Since (6) is formed, the lid (A) is bent rib (6) (6)
The pulling force and bending repulsive force generated during rotation by opening and closing via are rarely directly applied to the connecting part (C),
Therefore, the band-shaped synthetic resin tape (10) at the connecting portion (C)
It is possible to prevent the occurrence of peeling or peeling of the non-adhesive portion and impairing the appearance of the container. In addition, the adhesive force of the synthetic resin tape (10) is weakened so that the synthetic resin tape (10) can be peeled off, and one end portion of the synthetic resin tape (10) is slightly extended from the edge of the connecting portion of the container or is in a non-adhesive state. If the knob part (11) is formed in this way, this knob part (1
The lid portion (A) can be easily opened by pinching 1) and peeling the synthetic resin tape (10). Further, according to the present invention, the manufacturing process described above has an excellent effect such that the manufacturing time can be shortened and the flow of the production line can be smoothly advanced.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a manufacturing method according to the present invention.

FIG. 2 is an enlarged perspective view showing one step of the manufacturing method.

FIG. 3 is a front view showing a joining roller portion in the above manufacturing method.

FIG. 4 is a partial perspective view showing an example of a connecting portion of the container according to the present invention.

FIG. 5 is a partial perspective view showing another example of the connecting portion.

FIG. 6 is a partial perspective view showing still another example of the connecting portion.

FIG. 7 is a partial side view of a container obtained by the manufacturing method of the present invention.

FIG. 8 is an overall perspective view showing a closed state of the container.

FIG. 9 is a perspective view showing a state in which the synthetic resin tape is peeled off in the container.

FIG. 10 is an overall perspective view showing another example of the container obtained by the manufacturing method of the present invention.

11 is a perspective view showing a closed posture of the container shown in FIG.

[Explanation of symbols] (A) Container lid (B) Container body (C) Container joint (K) Single container (D1) (D2) Die (1) Synthetic resin sheet material (2) Synthetic resin Sheet material (4) Molding machine (5a) (5b) Bonding allowance (6) Bending rib (9) Cutting machine (10) Synthetic resin tape (11) Knob part

Claims (3)

[Claims] 1. A container in which a lid portion (A) having a required uneven three-dimensional shape and a body portion (B) having a required uneven three-dimensional shape are integrally connected by a connecting portion (C), Highly transparent synthetic resin sheet material (1) formed using a new material for the lid part (A)
The body part (B) is made of a low transparency synthetic resin sheet material (2) formed by using waste material, and the connecting part (C) is formed.
Abutting the flat side edges of the synthetic resin materials (1) and (2) that form the lid (A) and the body (B), and straddling these flat side edges with an appropriate width. Band-shaped synthetic resin tape (1
0) is formed by polymerizing and adhering, and the connecting portion (C)
A synthetic resin container for food packaging in which foldable ribs (6), (6) are formed adjacent to both sides along the width direction of the lid (A) and the body (B). 2. A synthetic resin tape (1) in the connecting portion (C).
(0) is bonded with a peelable adhesive force, and the synthetic resin tape (1
The synthetic resin container for food packaging according to claim 1, wherein one end portion of (0) is slightly extended from the edge of the connecting portion of the container or is in a non-adhesive state and is formed on the knob portion (11). 3. A highly transparent belt-shaped synthetic resin sheet material (1) formed of a new material and a low-transparency belt-shaped synthetic resin sheet material (2) formed of a waste material are arranged side by side and drawn out. Process and these synthetic resin sheet materials (1), (2)
Bending ribs (6), (6) that form a desired uneven shape on the side edges and leave flat bonding margins (5a) and (5b) along the side edges adjacent to each other. And the synthetic resin sheet materials (1) and (2) are aligned in a state where the side edges of the synthetic resin sheet materials are abutted against each other, and the belt-shaped synthetic resin tape having an appropriate width across both the bonding margins (5a) and (5b). 1. A method for producing a synthetic resin container for food packaging, which comprises a step of adhering (10) and a step of cutting the uncut container-forming strip (8) thus continuously molded into a single container (K).