JP2649456B2 - Synthetic resin container for food packaging and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for storing and packing foods such as eggs, tofu, meat, fish and shellfish for distribution such as transportation, display and sale. A container in which a lid and a body of a container to be opened are formed so as to be openable and closable, wherein the lid is formed of a highly transparent synthetic resin sheet formed using a new material, and the body is a waste material. 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 the same and allows the inside of the container to be seen through a lid, and a method of manufacturing the same.

[0002]

2. Description of the Related Art In terms of garbage disposal and effective use of resources,
There has been a demand for collecting and recycling synthetic resin food containers.
A device as disclosed in Japanese Patent No. -43132 was proposed.
However, in this prior invention, the transparency of the synthetic resin sheet using waste materials is low due to the inclusion of contaminants and printing ink, etc., and the opaque property is slightly colored. Has the disadvantage of being bad. In consideration of this point, the applicant of the present invention has formed a lid portion of the container with an opaque sheet material, formed a body portion with a transparent sheet material, and polymerized and welded the two portions so that they can be folded at the flange portion. a container that was proposed in the No. Tokuoyake flat 3-49745. In this container, the joint portion of the lid portion and the body portion, which are welded by polymerization, is formed to be thin and curved so as to be bendable. However, this method has a drawback in that the fusion head must be pressed until the connecting portion becomes thin so as to be bendable, so that the fusion time is required and the smooth flow of the production line is hindered.

[0003]

SUMMARY OF THE INVENTION Accordingly, a first object of the present invention is to form a high-transparency synthetic resin sheet material only on the lid portion and dispose of the body portion based on such a conventional technique. By using a synthetic resin sheet with low transparency, it is possible to easily see the state of the food stored in the container from the outside, while at the same time aiming at effective use of waste materials, and at the same time, the lid and the body. Another object of the present invention is to provide a container capable of shortening the manufacturing time and allowing the flow of the production line to proceed smoothly by taking into account the connection between the parts.

Further, a second object of the present invention is to provide a method for manufacturing such a container, in which the entire container is manufactured as quickly as a case where the container is manufactured using a material sheet formed only of a new material. Another object of the present invention is to provide a novel manufacturing method capable of efficiently manufacturing.

[0005]

In order to achieve the first object, in a synthetic resin container for food packaging according to the present invention, a lid (A) having a required three-dimensional shape is provided. A highly transparent synthetic resin sheet material in which a body (B) having an uneven three-dimensional shape is integrally connected at a connecting portion (C), wherein the lid portion (A) is formed using a new material. (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 composed of a lid (A) and a body. One flat edge portion of each of the synthetic resin materials (1) and (2) forming (B) is disposed in parallel at a required interval, and an appropriate width is provided over these flat side edge portions. Formed by polymerizing and bonding a belt-shaped synthetic resin tape (10) that can be bent at One in which the.

The production method of the present invention for achieving the second object is a method of producing a strip-shaped synthetic resin sheet material (1) having high transparency formed by using a new material and a low transparency having a low transparency formed by using a waste material. A step of arranging and pulling out the belt-shaped synthetic resin sheet material (2) in parallel, forming a required uneven shape on these synthetic resin sheet materials (1) and (2), and flattening them along side edges adjacent to each other. Adhesion allowance (5a), (5
b), and arranging the side edges of the synthetic resin sheet materials (1) and (2) in parallel at a required interval.
In the state where they were installed, both adhesion allowances (5a), (5b)
A step of adhering a band-shaped synthetic resin tape (10) having an appropriate width over the step (b), and a step of cutting the uncut container forming band (8) thus continuously molded into a single container (K). This is a configuration in which

The synthetic resin sheet material (1) utilizing new materials and the synthetic resin sheet material (2) utilizing waste materials referred to in the present invention are:
Products extruded from separate or one synthetic resin extruders are continuously transferred to the processing step, or those formed in advance are supplied to the processing step.
The sheet-like material extruded from the extruder can be made to be a material having a strength for its thickness by being stretched by adding a stretching step. In this case, it is preferable to increase the thickness of the extruder extruded from the die in consideration of the fact that the original sheet is thinned by the stretching step.

[0008]

In the container constructed as described above, only the lid (A) is formed of a new synthetic resin sheet material having high transparency.
By forming the body part (B) with a synthetic resin sheet of low transparency made of waste material, the waste material can be effectively used, but the state of the food stored in the container can be easily seen through from the outside. A container similar to a new material that can be obtained can be obtained. Further, a connecting portion (C) between the lid portion (A) and the body portion (B) is a flat one of the synthetic resin materials (1) and (2) forming the lid portion (A) and the body portion (B). It is formed by polymerizing and bonding a band-shaped synthetic resin tape (10) that can be bent with an appropriate width across these flat side edge portions with the side edge portions adjacent to each other. Can be smoothly carried out along the flow of the container production line, and by setting the interval between adjacent edges of the synthetic resin tapes (1) and (2) to a desired size at the time of joining. The width of the connecting portion (C) can be adjusted according to the form of the container and the stored items.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for manufacturing a container according to the present invention will be described below with reference to the embodiment shown in FIGS. From the two horizontal dies (D1) and (D1) of the synthetic resin extruder, a molten and colorless and transparent new polystyrene resin is extruded, and two narrow and highly transparent unstretched new synthetic resin sheet materials (1) are extruded. ) (1) is extruded in a belt shape. Another wide die (D) disposed between these dies (D1) and (D1)
From 2), the molten opaque waste polystyrene resin is extruded, and a wide and opaque unstretched waste synthetic resin sheet material (2) is extruded in a belt shape. In the present embodiment, the width of the new synthetic resin sheet material (1) (1) is set to a size that can be sequentially molded in a state where the lids (A) of the molded containers are lined up in a line in the length direction. The width of the waste synthetic resin sheet material (2) is set to such a size that the body portions (B) of the container to be molded can be sequentially molded in a state of being arranged in two rows in the length direction. Each of the sheet materials (1) and (2) extruded from these dies is stretched by a stretching roller (3a) (3b) to a predetermined thickness, for example, about 0.25 mm, and is sent to a molding machine (4).

[0010] Sheet material (1) sent to the molding machine (4)
In (1) and (2), irregularities corresponding to the lid (A) and body (B) of the container are formed, respectively. At the same time as this molding, flat side edge portions (5a) and (5b) for forming a joint portion (C) are formed at opposing edges of the sheet material (1) and the sheet material (2). The molding machine (4) is a pair of upper and lower molding dies (4) for vacuum molding or blow molding.
a) and (4b), in which both molds repeat the operation of opening and closing while returning synchronously along the sheet material advancing direction and returning to the original position.

Next, the sheet materials (1), (1) and (2) on which the required irregularities are formed are separated from each other by flattening adjacent flat side edge portions (5a) and (5b) at a desired interval. Align them face-to-face, and on both sides (5
a) and (5b) are passed over between them by passing a band-shaped synthetic resin tape (10) having an appropriate width on the lower surface thereof between the upper and lower joining rollers (7a) and (7b). The joining portion (C) is formed by fusion bonding. In this embodiment, the upper joining roller (7a) is formed by two thin flat gears so that the two members are fused and joined in an array of two rows of point joints as shown in FIGS. However, by changing the shape of the upper joining roller (7a), it is possible to perform the fusion joining in an arrangement of continuous horizontal lines as shown in FIG. 5 or a continuous two-line arrangement (not shown). Alternatively, the upper and lower joining rollers can be formed on a flat surface so that the entire surface can be adhered.

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

In this embodiment, two rows of containers are shown as being molded simultaneously, however, the number of rows of containers is two.
It need not be a row at all, and may be at least one row.
Needless to say, the molding can be performed in an appropriate number of rows or more, for example, three rows or five rows according to the size of the manufacturing apparatus.

FIG. 7 shows an example of a container manufactured by the above method. The container of the embodiment shown here has a shape for accommodating 5 eggs × 2 rows = 10, but of course the number is not specified, and FIG. 12 and FIG.
As shown in FIG. 3, the shape may be such that three eggs × 2 rows = six eggs are stored. The container is formed of a lid portion (A) formed of a highly transparent synthetic resin sheet material (1) formed using a new material and a low transparent synthetic resin sheet material (2) formed of a waste material. The body part (B) is connected by a connecting part (C). The connecting portion (C) is made of a synthetic resin material (1) forming the lid portion (A) and the body portion (B).
Each of the flat side edge portions (5a) and (5b) of (2) is adjacent to each other so as to face each other at a desired interval, and a bendable band-like composite having an appropriate width is stretched over these flat side edge portions. It is formed by polymerizing and bonding a resin tape (10).

The synthetic resin tape (10) is joined with a peelable adhesive force so that one end of the synthetic resin tape (10) is in a non-adhered state, or as shown in FIG. If the knob (12) is formed by forming an incision (11) at the edge portion of C), the knob (12) is pinched and the synthetic resin tape (10) is peeled off at the time of opening. Thereby, the lid (A) can be easily opened.

In the container shown in FIG. 8, when the lid (A) is closed, the opposing surfaces of the lid (A) and the body (B) as shown in FIG. 14), it is formed so as to contact and close in a parallel posture.
Like the container shown in 3, the lid (A) may be formed so as to close in an inclined state such that the tip end of the lid (A) is at a lower level.

At the time of forming the connecting portion (C), the interval between the adjacent edge portions of the synthetic resin tapes (1) and (2) is set to a desired size, so that the synthetic resin tape (1) and the synthetic resin tape (2) have a desired size. The width at the connecting portion (C) with the body portion (B) can be adjusted according to the form of the container and the stored items. For example, by setting a relatively large interval as shown in FIGS. 4 to 8, the width at the connecting portion (C) between the lid portion (A) and the body portion (B) can be increased, and conversely, when the interval is reduced. As shown in FIGS. 9 to 11, the width of the connecting portion (C) can be reduced so that the lid portion (A) and the body portion (B) can be closed in close contact with each other.

Although the representative embodiment of the present invention has been described above, the present invention is not necessarily limited to the above embodiment. For example, by making the shape of the molding machine (4) different, the shape of the lid (A) and the shape of the body (B) can be changed to a shape suitable for accommodating other foods. . In addition, the joining of the connecting portion (C) is not limited to the above-mentioned method of heat fusion using the joining roller, but may be a joining means using a high frequency, an ultrasonic wave, or a laser. In addition, in the present invention, it is needless to say that the present invention can be carried out by appropriately changing the configuration within the scope of providing the components and having the effect.

[0019]

As is clear from the above description, according to the present invention, only the cover (A) is formed of a new synthetic resin sheet material having a high transparency, and the body (B) is formed of a waste material having a transparency. By forming it from a low synthetic resin sheet, it is possible to obtain a container similar to a new material, which allows effective use of waste materials, but also allows the state of food stored in the container to be easily seen through the outside from the outside. it can. Further, a connecting portion (C) between the lid portion (A) and the body portion (B) is a flat one of the synthetic resin materials (1) and (2) forming the lid portion (A) and the body portion (B). It is formed by arranging side edge portions in parallel at a required interval, and polymerizing and bonding a band-shaped synthetic resin tape (10) that can be bent with an appropriate width over these flat side edge portions. Therefore, the time required for joining the synthetic resin tapes (10) is reduced, so that it can be manufactured smoothly along the flow of the container production line, and the adjacent ends of the synthetic resin tapes (1) and (2) are joined at the time of joining. By setting the interval between the edge portions to a desired size, the width of the connecting portion (C) can be easily changed in accordance with the shape of the container and the storage items, and can be adapted to various containers. Has an excellent effect.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one 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 part in the 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 the closed state of the container.

FIG. 9 is a perspective view showing another embodiment of the container obtained by the manufacturing method of the present invention.

FIG. 10 is a side view of the connecting portion of the container shown in FIG. 9;

FIG. 11 is a side view showing a state where the connecting portion of the container is bent.

FIG. 12 is a perspective view showing still another embodiment of the container obtained by the production method of the present invention.

FIG. 13 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) Flat side edge (9) Cutting machine (10) Synthetic resin tape

Claims (2)

(57) [Claims] 1. A lid (A) having a required three-dimensional shape.
And a body (B) having a required three-dimensional shape are integrally connected by a connecting part (C), wherein the lid part (A) is formed of a new material and has high transparency. The body part (B) is made of a synthetic resin sheet material (2) having low transparency formed by using waste material, and the connecting part (C) is made of a lid part (A). And one flat edge portion of each of the synthetic resin materials (1) and (2) forming the body portion (B) are arranged in parallel at a required interval, and straddle these flat side edge portions. A synthetic resin container for food packaging formed by polymerizing and bonding a band-like synthetic resin tape (10) that can be bent with an appropriate width. 2. A strip-shaped synthetic resin sheet material having high transparency formed using a new material (1) and a strip-shaped synthetic resin sheet material having low transparency formed using a waste material (2) are juxtaposed and drawn out in parallel. Steps: forming a desired uneven shape on the synthetic resin sheet materials (1) and (2), and flattening allowances (5a) and (5) along side edges adjacent to each other.
b), and arranging the side edges of the synthetic resin sheet materials (1) and (2) in parallel at a required interval.
In the state where they were installed, both adhesion allowances (5a), (5b)
A step of adhering a band-shaped synthetic resin tape (10) having an appropriate width over the step (b), and a step of cutting the uncut container forming band (8) thus continuously molded into a single container (K). A method for producing a synthetic resin container for food packaging comprising: