JPH07165227A - Synthetic resin vessel for packing food and production thereof - Google Patents

Abstract

PURPOSE:To provide a new synthetic resin vessel and its production method by which the inside thereof can be watched transparently from the outside although much of waste materials are used and the joint between the lid and the body is taken into consideration. CONSTITUTION:A lid having a specified uneven cubical shape and a body having a specified uneven cubical shape are connected to each other as a unit at the joint to form a container. The lid is made of a transparent synthetic resin sheet 1 formed by use of a fresh material and the body is made of a translucent synthetic resin sheet 2 formed by use of waste materials. Respective flat side edges of the synthetic resin sheets 1, 2 forming the lid and body are positioned adjacently in the joint and a flexible belt-form synthetic resin tape 10 having an appropriate width is overlapped and stuck so as to join these flat side edges end to end.

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. However, with this means, the fusion head must be pressed until the connecting portion becomes thin so that it can be bent, so that there is the disadvantage that the fusion time is required and the smooth flow of the production line is hindered.

[0003]

SUMMARY OF THE INVENTION The first object of the present invention is, therefore, based on the above-mentioned conventional technique, only the lid portion is formed of a new synthetic resin sheet material having high transparency, and the body portion is discarded. By using a synthetic resin sheet with low transparency due to the above, it is possible to make effective use of waste materials, but it is possible to easily see through from the outside the state of the food stored in the container, and the lid and body An object of the present invention is to provide a container in which the manufacturing time can be shortened and the flow of the production line can be smoothly progressed by adding consideration to the connecting portion with the parts.

A second object of the present invention is to manufacture such a container as quickly as in the case of manufacturing the container using a raw material sheet formed only of a new material for the entire container. Another object of the present invention is to provide a novel manufacturing method that can be manufactured efficiently.

[0005]

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 formed of a low transparency synthetic resin sheet material (2) formed using waste material, the connecting portion (C)
Are adjacent to one flat side edge portion of each of the synthetic resin materials (1) and (2) forming the lid portion (A) and the body portion (B), and a suitable one is spread over these flat side edge portions. It has a structure formed by polymerizing and adhering a band-shaped synthetic resin tape (10) that can be bent with a width.

The manufacturing method of the present invention for achieving the second object is a belt-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 step of arranging the strip-shaped synthetic resin sheet material (2) in parallel and pulling it out, and forming the required concavo-convex shape on these synthetic resin sheet materials (1) and (2) and flattening them along side edges adjacent to each other. Adhesion allowances (5a), (5b), and the step of forming the synthetic resin sheet material (1), the side edges of the (2) are aligned in a state of being adjacent to each other both adhesion allowances (5a), (5b) A step of adhering a strip-shaped synthetic resin tape (10) having an appropriate width across the strip, and the uncut container-forming strip (8) continuously molded in this manner
Is cut into a single container (K).

The synthetic resin sheet material (1) using a new material and the synthetic resin sheet material (2) using a waste material according to 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.

[0008]

[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)
Adjacent one flat side edge part of each of the synthetic resin materials (1) and (2) forming the lid part (A) and the body part (B), and straddling these flat side edge parts with an appropriate width. Since it is formed by polymerizing and adhering a strip-shaped synthetic resin tape (10) that can be folded with, the joining of the synthetic resin tape (10) can be performed smoothly along the flow of the container production line, and By setting the interval between the adjacent edge portions of the synthetic resin tapes (1) and (2) at the time of joining to a desired dimension, the connecting portion (C)
The width of the can be adjusted according to the form of the container and the stored items.

[0009]

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 uneven shapes corresponding to the lid (A) and body (B) of the container, respectively. At the same time as this molding, the sheet material
A connecting part at the opposite edges of (1) and the sheet material (2)
Flat side edge portions (5a) and (5b) for forming (C) 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 placed at desired intervals between the adjacent flat side edge portions (5a) and (5b). Align them so that they face each other, and strip the synthetic resin tape (10) of appropriate width across both sides (5a) and (5b) on both sides.
Upper and lower splicing rollers (7a) heated in a stacked state
It is passed between (7b), and these are fusion-bonded to each other to form a connecting portion (C). In this embodiment, the upper joining roller (7a) is formed of two thin flat gears so that fusion bonding is carried out by the arrangement of two rows of aligned point joining as shown in FIGS. However, by changing the shape of the upper bonding roller (7a), it is possible to perform fusion bonding in an array of continuous horizontal lines as shown in FIG. 5, or in a continuous two-row linear array (not shown). 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 a 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 to be 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. 7 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. 3, 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). The connecting portion (C) is a flat side edge portion (5a) of each of the synthetic resin materials (1) and (2) forming the lid portion (A) and the body portion (B).
(5b) are formed adjacent to each other so as to face each other with a desired spacing, and a foldable strip-shaped synthetic resin tape (10) having an appropriate width is polymer-bonded across these flat side edge portions. .

The synthetic resin tape (10) is joined by a peelable adhesive force so that one end of the synthetic resin tape (10) is in a non-adhesive state, or as shown in FIG. If the incision (11) is formed at the edge of (C) so that the knob (12) is formed, the synthetic resin tape (10) is peeled off by pinching the knob (12) when opening. By the lid (A)
Can be easily opened.

In the container shown in FIG. 8, when the lid (A) is closed, the surfaces of the lid (A) and the body (B) which face each other are in contact with each other as shown in FIG. 14) is formed so as to abut and close in a parallel posture, but in a state in which the tip of the lid portion (A) is tilted so as to be in a lower slope like the container shown in FIGS. 12 and 13. You may form so that it may be closed.

When forming the above-mentioned connecting portion (C), the interval between the adjacent edge portions of the synthetic resin tapes (1) and (2) is set to a desired dimension so that the lid portion (A) and 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 distance 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 if the distance is narrowed, on the contrary. As shown in FIGS. 9 to 11, the width of the connecting portion (C) can be reduced to close the lid portion (A) and the body portion (B) in a close contact state.

Although the representative embodiments of the present invention have been described above, 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.

[0019]

As is apparent from the above description, according to the present invention, 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 waste material so as to be transparent. By forming it with a low synthetic resin sheet, it is possible to obtain a container similar to a new material that enables effective utilization of waste materials, but allows the state of food stored inside the container to be easily seen from the outside. it can. Further, the 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). Since the side edge portions are adjacent to each other and the strip-shaped synthetic resin tape (10) that can be bent with an appropriate width is polymerized and adhered to these flat side edge portions, the synthetic resin tape (1
The time required for joining (0) can be shortened so that it can be smoothly produced along the flow of the container production line, and at the time of joining, the interval between the adjacent edge portions of the synthetic resin tapes (1) and (2) can be set to a desired value. By setting the dimensions, it is possible to easily change the width of the connecting portion (C) according to the form of the container and the stored items, and it is possible to cope with various containers.

[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 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.

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

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

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

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] October 29, 1993

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be amended] Detailed explanation of the invention

[Correction method] Change

[Correction content]

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. However, with this means, the fusion head must be pressed until the connecting portion becomes thin so that it can be bent, so that there is the disadvantage that the fusion time is required and the smooth flow of the production line is hindered.

[0003]

SUMMARY OF THE INVENTION The first object of the present invention is, therefore, based on the above-mentioned conventional technique, only the lid portion is formed of a new synthetic resin sheet material having high transparency, and the body portion is discarded. By using a synthetic resin sheet with low transparency due to the above, it is possible to make effective use of waste materials, but it is possible to easily see through from the outside the state of the food stored in the container, and the lid and body An object of the present invention is to provide a container in which the manufacturing time can be shortened and the flow of the production line can be smoothly progressed by adding consideration to the connecting portion with the parts.

A second object of the present invention is to manufacture such a container as quickly as in the case of manufacturing the container using a raw material sheet formed only of a new material for the entire container. Another object of the present invention is to provide a novel manufacturing method that can be manufactured efficiently.

[0005]

In order to achieve the above-mentioned first object, the synthetic resin container for food packaging according to the present invention has a lid portion (A) having a required three-dimensional concavo-convex shape and a required one. 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 is a highly transparent synthetic resin sheet material. (1) and the body (B) is formed of a synthetic resin sheet material (2) having a low transparency formed by using a waste material, and the connecting portion (C) is the lid (A) and the body. A strip-shaped synthetic resin tape in which one flat side edge portion of each of the synthetic resin materials (1) and (2) forming (B) is adjacent to each other and can be bent with an appropriate width over the flat side edge portion. (10)
Is formed by polymerizing and adhering.

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 step of arranging the strip-shaped synthetic resin sheet material (2) in parallel and pulling it out, and forming the required concavo-convex 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 aligning the side edges of the synthetic resin sheet materials (1) and (2) so that they are adjacent to each other, and arranging them to have a suitable width across both bonding margins (5a) and (5b). A step of adhering a strip-shaped synthetic resin tape (10), and an uncut container-formed strip (8) continuously molded in this manner
Is cut into a single container (K).

The synthetic resin sheet material (1) using new material and the synthetic resin sheet material (2) using waste material according to the present invention are
Those formed by extruding from separate or 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.

[0008]

In the container constructed as described above, only the lid (A) is made of a new synthetic resin sheet material having high transparency,
By forming the body (B) from a synthetic resin sheet made of waste material and having low transparency, the waste material can be effectively utilized, but the state of the food stored in the container can be easily seen from the outside. It is possible to obtain a container similar to the new material. The 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). The synthetic resin tape (10) is formed by polymerizing and adhering the strip-shaped synthetic resin tape (10), which is bendable with an appropriate width, over the flat side edge portions so that the side edge portions are adjacent to each other. ) Can be smoothly joined along the flow of the container production line, and the interval between the adjacent edge portions of the synthetic resin tapes (1) and (2) is set to a desired dimension 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]

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. Melted colorless and transparent new polystyrene resin is extruded from two horizontal die (D1) (D1) of a synthetic resin extruder, and two unstretched new synthetic resin sheet materials with small width and high transparency (1) (1) is extruded into a strip shape. Another wide die (D) disposed between these dies (D1) (D1)
From 2), a molten opaque waste material polystyrene resin is extruded, and a wide and opaque unstretched waste material synthetic resin sheet material (2) is extruded into a band shape. In the present embodiment, the width of the new synthetic resin sheet material (1) (1) is set to a dimension such that the lids (A) of the containers to be molded can be sequentially molded in a state in which they are aligned in a row in the length direction. The width of the waste synthetic resin sheet material (2) is set to such a size that the body parts (B) of the container to be molded can be sequentially molded in a state where the body parts (B) are 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, about 0.25 mm thick, and sent to the molding machine (4).

Sheet material (1) sent to the molding machine (4)
In (1) and (2), uneven shapes corresponding to the lid (A) and the body (B) of the container are formed. Simultaneously with this molding, flat side edge portions (5a) (5b) for forming the connecting portion (C) are formed at the opposite edges of the sheet material (1) and the sheet material (2). The molding machine (4) has a pair of upper and lower molding dies (4
a) and (4b), both molding dies perform the molding operation by repeating the operation of opening and closing and returning to the original position while moving synchronously along the sheet material advancing direction.

Next, the sheet materials (1), (1) and (2) on which the required concavo-convex shape is formed are arranged at desired intervals between the adjacent flat side edge portions (5a) and (5b). Align them so that they face each other, and
a) and (5b) on the lower surface of the belt-shaped synthetic resin tape (10) having an appropriate width astride both of them and passed through the heated upper and lower joining rollers (7a) and (7b), and these are passed. The joining portion (C) is formed by fusion bonding. In the present embodiment, the upper joining roller (7a) is formed by two thin flat gears so that fusion bonding is performed by the two-row aligned spot joining arrangement as shown in FIGS. However, by changing the shape of the upper joining roller (7a), for example, it is possible to perform fusion bonding in an array of continuous horizontal lines as shown in FIG. 5 or a continuous two-row linear array (not shown). Further, by forming the upper and lower joining rollers on flat surfaces, it is possible to adhere them over the entire surface.

Finally, the uncut container strip (8) thus formed 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 of a high-frequency fusing type or of any other type. The separated individual containers (K) are sent to a packing device via a chute (not shown), a transfer conveyor, etc., and are packed in a predetermined number of boxes.

In the present embodiment, two rows of containers are shown to be 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. 7 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, and FIG. 12 and FIG.
As shown in FIG. 3, it may be formed in such a shape as to store 3 eggs × 2 rows = 6 eggs. The container is made of a synthetic resin sheet material (1) made of a new material and having a high transparency, and a lid portion (A) made of a waste material and a synthetic resin sheet material (2) of a low transparency. The body part (B) thus formed is connected by a connecting part (C). The connecting portion (C) is a synthetic resin material (1) that forms the lid portion (A) and the body portion (B).
Each of the flat side edge portions (5a) and (5b) of (2) are adjacent to each other at a desired distance so as to face each other, and a foldable strip-shaped composite having an appropriate width is provided across these flat side edge portions. It is formed by polymerizing and adhering a resin tape (10).

The synthetic resin tape (10) is joined with a peelable adhesive force to leave one end of the synthetic resin tape (10) in a non-adhesive state, or as shown in FIG. If the cutout portion (11) is formed at the edge portion of C) so that the knob portion (12) is formed, the synthetic resin tape (10) is peeled by pinching the knob portion (12) when opening. As a result, the lid part (A) can be easily opened.

In the container shown in FIG. 8, when the lid (A) is closed, the surfaces of the lid (A) and the body (B) which face each other are in contact with each other as shown in FIG. 14) is formed so as to abut and close in a parallel posture in FIG.
Like the container shown by 3, the lid (A) may be formed so as to be closed in a tilted state so that the tip of the lid (A) is lower than the tilt.

When forming the above-mentioned connecting portion (C), the interval between the adjacent edge portions of the synthetic resin tapes (1) and (2) is set to a desired dimension, so that the lid portion (A) and The width of 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 distance 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 if the distance is narrowed, on the contrary. As shown in FIGS. 9 to 11, the width of the connecting portion (C) can be reduced to close the lid portion (A) and the body portion (B) in a close contact state.

Although the representative embodiments of the present invention have been described above, the present invention is not necessarily limited to the structures of the above embodiments. For example, by changing the uneven shape of the molding machine (4), 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 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.

[0019]

As is apparent from the above description, according to the present invention, 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 waste material. By using a low synthetic resin sheet, it is possible to obtain a container similar to a new material that enables effective utilization of waste materials, but allows the state of food stored inside the container to be easily seen from the outside. it can. The 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). The synthetic resin tape (10) is formed by polymerizing and adhering the strip-shaped synthetic resin tape (10), which is bendable with an appropriate width, over the flat side edge portions so that the side edge portions are adjacent to each other. ), The time required for joining can be shortened, and it can be smoothly produced along the flow of the container production line, and at the time of joining, the interval between the adjacent edge portions of the synthetic resin tapes (1) and (2) can be set to a desired dimension. The width of the connecting portion (C) can be easily changed according to the form of the container and the contents to be accommodated, so that it can be applied to various containers. ─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] September 7, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 2

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be amended] Detailed explanation of the invention

[Correction method] Change

[Correction content]

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. However, with this means, the fusion head must be pressed until the connecting portion becomes thin so that it can be bent, so that there is the disadvantage that the fusion time is required and the smooth flow of the production line is hindered.

[0003]

SUMMARY OF THE INVENTION The first object of the present invention is, therefore, based on the above-mentioned conventional technique, only the lid portion is formed of a new synthetic resin sheet material having high transparency, and the body portion is discarded. By using a synthetic resin sheet with low transparency due to the above, it is possible to make effective use of waste materials, but it is possible to easily see through from the outside the state of the food stored in the container, and the lid and body An object of the present invention is to provide a container in which the manufacturing time can be shortened and the flow of the production line can be smoothly progressed by adding consideration to the connecting portion with the parts.

A second object of the present invention is to manufacture such a container as quickly as in the case of manufacturing the container using a raw material sheet formed only of a new material for the entire container. Another object of the present invention is to provide a novel manufacturing method that can be manufactured efficiently.

[0005]

In order to achieve the above-mentioned first object, the synthetic resin container for food packaging according to the present invention has a lid portion (A) having a required three-dimensional concavo-convex shape and a required one. 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 is a highly transparent synthetic resin sheet material. (1) and the body (B) is formed of a synthetic resin sheet material (2) having a low transparency formed by using a waste material, and the connecting portion (C) is the lid (A) and the body. A strip-shaped synthetic resin tape in which one flat side edge portion of each of the synthetic resin materials (1) and (2) forming (B) is adjacent to each other and can be bent with an appropriate width over the flat side edge portion. (10)
Is formed by polymerizing and adhering.

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 step of arranging the strip-shaped synthetic resin sheet material (2) in parallel and pulling it out, and forming the required concavo-convex 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 aligning the side edges of the synthetic resin sheet materials (1) and (2) so that they are adjacent to each other, and arranging them to have a suitable width across both bonding margins (5a) and (5b). A step of adhering a strip-shaped synthetic resin tape (10), and an uncut container-formed strip (8) continuously molded in this manner
Is cut into a single container (K).

The synthetic resin sheet material (1) using new material and the synthetic resin sheet material (2) using waste material according to the present invention are
Those formed by extruding from separate or 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.

[0008]

In the container constructed as described above, only the lid (A) is made of a new synthetic resin sheet material having high transparency,
By forming the body (B) from a synthetic resin sheet made of waste material and having low transparency, the waste material can be effectively utilized, but the state of the food stored in the container can be easily seen from the outside. It is possible to obtain a container similar to the new material. The 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). The synthetic resin tape (10) is formed by polymerizing and adhering the strip-shaped synthetic resin tape (10), which is bendable with an appropriate width, over the flat side edge portions so that the side edge portions are adjacent to each other. ) Can be smoothly joined along the flow of the container production line, and the interval between the adjacent edge portions of the synthetic resin tapes (1) and (2) is set to a desired dimension 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]

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. Melted colorless and transparent new polystyrene resin is extruded from two horizontal die (D1) (D1) of a synthetic resin extruder, and two unstretched new synthetic resin sheet materials with small width and high transparency (1) (1) is extruded into a strip shape. Another wide die (D) disposed between these dies (D1) (D1)
From 2), a molten opaque waste material polystyrene resin is extruded, and a wide and opaque unstretched waste material synthetic resin sheet material (2) is extruded into a band shape. In the present embodiment, the width of the new synthetic resin sheet material (1) (1) is set to a dimension such that the lids (A) of the containers to be molded can be sequentially molded in a state in which they are aligned in a row in the length direction. The width of the waste synthetic resin sheet material (2) is set to such a size that the body parts (B) of the container to be molded can be sequentially molded in a state where the body parts (B) are 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, about 0.25 mm thick, and sent to the molding machine (4).

Sheet material (1) sent to the molding machine (4)
In (1) and (2), uneven shapes corresponding to the lid portion (A) and the body portion (B) of the container are formed. Simultaneously with this molding, flat side edge portions (5a) (5b) for forming the connecting portion (C) are formed at the opposite edges of the sheet material (1) and the sheet material (2). The molding machine (4) has a pair of upper and lower molding dies (4
a) and (4b), both molding dies perform the molding operation by repeating the operation of opening and closing and returning to the original position while moving synchronously along the sheet material advancing direction.

Next, the sheet materials (1), (1) and (2) on which the required concavo-convex shape is formed are arranged at desired intervals between the adjacent flat side edge portions (5a) and (5b). Align them so that they face each other, and
a) and (5b) on the lower surface of the belt-shaped synthetic resin tape (10) having an appropriate width astride both of them and passed through the heated upper and lower joining rollers (7a) and (7b), and these are passed. The joining portion (C) is formed by fusion bonding. In the present embodiment, the upper joining roller (7a) is formed by two thin flat gears so that fusion bonding is performed by the two-row aligned spot joining arrangement as shown in FIGS. However, by changing the shape of the upper joining roller (7a), for example, it is possible to perform fusion bonding in an array of continuous horizontal lines as shown in FIG. 5 or a continuous two-row linear array (not shown). Further, by forming the upper and lower joining rollers on flat surfaces, it is possible to adhere them over the entire surface.

Finally, the uncut container strip (8) thus formed 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 of a high-frequency fusing type or of any other type. The separated individual containers (K) are sent to a packing device via a chute (not shown), a transfer conveyor, etc., and are packed in a predetermined number of boxes.

In the present embodiment, two rows of containers are shown to be 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. 7 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. 3, it may be formed in such a shape as to store 3 eggs × 2 rows = 6 eggs. The container is made of a synthetic resin sheet material (1) made of a new material and having a high transparency, and a lid portion (A) made of a waste material and a synthetic resin sheet material (2) of a low transparency. The body part (B) thus formed is connected by a connecting part (C). The connecting portion (C) is a synthetic resin material (1) that forms the lid portion (A) and the body portion (B).
Each of the flat side edge portions (5a) and (5b) of (2) are adjacent to each other so as to face each other at a desired distance, and a foldable strip-shaped composite having an appropriate width is formed across these flat side edge portions. It is formed by polymerizing and adhering a resin tape (10).

The synthetic resin tape (10) is joined with a peelable adhesive force to leave one end of the synthetic resin tape (10) in a non-adhesive state, or as shown in FIG. If the cutout portion (11) is formed at the edge portion of C) so that the knob portion (12) is formed, the synthetic resin tape (10) is peeled by pinching the knob portion (12) when opening. As a result, the lid part (A) can be easily opened.

In the container shown in FIG. 8, when the lid (A) is closed, the surfaces of the lid (A) and the body (B) which face each other are in contact with each other as shown in FIG. 14) is formed so as to abut and close in a parallel posture in FIG.
Like the container shown by 3, the lid (A) may be formed so as to be closed in a tilted state so that the tip of the lid (A) is lower than the tilt.

When forming the above-mentioned connecting portion (C), the interval between the adjacent edge portions of the synthetic resin tapes (1) and (2) is set to a desired dimension, so that the lid portion (A) and The width of 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 distance 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 if the distance is narrowed, on the contrary. As shown in FIGS. 9 to 11, the width of the connecting portion (C) can be reduced to close the lid portion (A) and the body portion (B) in a close contact state.

Although the representative embodiments of the present invention have been described above, the present invention is not necessarily limited to the structures of the above embodiments. For example, by changing the uneven shape of the molding machine (4), 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 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.

[0019]

As is apparent from the above description, according to the present invention, 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 waste material. By using a low synthetic resin sheet, it is possible to obtain a container similar to a new material that enables effective utilization of waste materials, but allows the state of food stored inside the container to be easily seen from the outside. it can. The 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). The synthetic resin tape (10) is formed by polymerizing and adhering the strip-shaped synthetic resin tape (10), which is bendable with an appropriate width, over the flat side edge portions so that the side edge portions are adjacent to each other. ), The time required for joining can be shortened, and it can be smoothly produced along the flow of the container production line, and at the time of joining, the interval between the adjacent edge portions of the synthetic resin tapes (1) and (2) can be set to a desired dimension. The width of the connecting portion (C) can be easily changed according to the form of the container and the contents to be accommodated, so that it can be applied to various containers.

Claims (2)

[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 formed of a low-transparency synthetic resin sheet material (2) formed by using a waste material, and the connecting part (C) is the lid part (A) and the body part (B). Resin material that forms the
By arranging the flat side edge portions of (1) and (2) adjacent to each other and polymerizing and adhering a strip-shaped synthetic resin tape (10) which is bendable with an appropriate width across these flat side edge portions. Formed synthetic resin container for food packaging. 2. A highly transparent belt-shaped synthetic resin sheet material (1) made of a new material and a highly transparent belt-shaped synthetic resin sheet material (2) made of a waste material are arranged side by side and drawn out. Process and these synthetic resin sheet materials (1), (2)
And a step of forming a flat bonding margin (5a), (5b) along side edges that are adjacent to each other while forming the required uneven shape on
Align the side edges of the synthetic resin sheet materials (1) and (2) so that they are adjacent to each other, and attach a strip-shaped synthetic resin tape (10) having an appropriate width across both adhesive margins (5a) and (5b). The step of bonding,
Uncut container-forming strips continuously molded in this way
A method for producing a synthetic resin container for food packaging, which comprises the step of cutting (8) into a single container (K).