JPH072244A - Synthetic resin food container and its manufacture - Google Patents

Abstract

PURPOSE:To obtain a synthetic resin food container and a method for manufacturing it for which a web consisting of a laminate of a sheet of synthetic resin produced from waste materials with a transparent film of newly produced synthetic resin is used form the lid and the holding part. CONSTITUTION:A sheet of synthetic resin 2 produced by utilizing waste materials is used as the base material. To the two surfaces of the sheet 2 a thin, transparent film of newly produced synthetic resin 1, 7 is laid by adhesion to form a composite web 9. Continuously the composite web 9 is passed through as forming machine 10 and shaped to have projections and hollows to form lids A and holding parts B of containers 11 arranged both in the direction of the web and transversely. After the forming, the containers formed in one piece are passed through a cutting machine 12 to be separated into unit containers. A folding container having a lid A and a holding part B in solid continuation is formed in the above-mentioned manner.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is formed of a composite web using a synthetic resin sheet made of waste material as a base material, and a synthetic resin film made of a new material is provided on the surface of the food storage space forming side. The present invention relates to a hygienic synthetic resin food container that is laminated to and a manufacturing method thereof.

[0002]

2. Description of the Related Art In recent years, due to the problem of dumping dust, a so-called recycling movement for collecting synthetic resin food containers for reuse as plastic resources has become popular. Therefore, it is desired to melt the collected collection containers and use them effectively and appropriately in the form of recycled pellets.

Therefore, the applicant of the present invention is, for example, a fair and fair 3-4
Although the proposal as described in Japanese Patent No. 3132 has already been made, in this prior invention, the waste synthetic resin sheet has a low transparency due to the inclusion of foreign matters and printing ink,
Moreover, in view of the slightly colored state, this is utilized as a molding sheet for only the body part of the container. From the viewpoint of food hygiene, a new material synthetic resin film is laminated on the inner surface side of the waste material sheet so that the waste material sheet does not come into direct contact with the food.

[0004]

SUMMARY OF THE INVENTION The first object of the present invention is to make it possible to utilize a larger amount of waste material based on the above-mentioned prior proposal technique. The specific issue is to make maximum use of waste synthetic resin materials,
The container producer can collect the entire amount and reuse it, and by using the lamination process of the new material synthetic resin film, it can be done by a simple and rational means that does not cause food hygiene problems. To do.

The second object of the present invention is to utilize a large amount of waste materials as described above, but the formed container is entirely made of new material like the container made of new material. To get a completely hygienic container covered with.

[0006] A third object of the present invention is to produce, name, sell, trade name, weight and size of the Ministry of Agriculture, Forestry and Fisheries standard, cooking method,
For the required display including advertising texts and designs, the printing part of the laminating film is placed on the relatively flat top plate part in the lid part so that it is not difficult to read the displayed content, and the container is molded. At the same time, it is intended to obtain a container with a print indication on which these required prints are made.

[0007]

A synthetic resin food container and a manufacturing method therefor according to the first and third inventions for achieving the first object will be described with reference to the reference numerals corresponding to the embodiments. The structure of the container of the first invention is such that a lid part (A) and a body part (B)
A container made of a synthetic resin sheet integrally formed so that it can be swung open and closed with the bending part (4d) as a fulcrum, and a two-layer sheet material is used as a forming material, and the entire one side layer is made of waste material. The synthetic resin sheet (2) used is a raw material, and the waste synthetic resin sheet (2) is used as a base material and an extremely thin synthetic resin film (7) made of a new material is laminated on the inner surface side of the waste synthetic resin sheet (2) as a base material. Part (A), (B) and bent part
The entire surface of the food storage space forming side (4d) is covered with the new synthetic resin film (7).

Further, the structure of the third invention as means for obtaining a container having such a structure is formed by using a synthetic resin sheet (2) which is a basic material entirely made of a waste material and a new material. Using the extremely thin synthetic resin film (7)
A first step of adhering this extremely thin synthetic resin film (7) to one side of the waste synthetic resin sheet (2) to form an integrated composite web (9), and the composite web formed in the first step The second step of transferring (9) between the molding dies (10a) and (10b) of the molding machine (10) arranged in the extension direction position of the first step, and the new material synthetic resin film (7) is a container. Of the composite web portion (9a) corresponding to the lid portion (A) of the container after molding and the composite web portion (9b) corresponding to the body portion (B) of the container after being positioned. The third step of forming and imparting the required concavo-convex shape, and the molded composite web (9) molded in this manner are subsequently moved to the position of the cutting machine (12) and cut into separate containers (K). 4 steps,
It is a method of sequentially and sequentially performing in this order.

The structure of the second invention relating to the container is the lid portion.
A container made of a synthetic resin sheet, in which (A) and a body part (B) are integrally formed so as to be able to swing and open and close with a bent portion (4d) as a fulcrum, and a surface layer and an intermediate layer are formed as forming materials. A three-layer sheet material composed of an inner surface layer is used, and the entire intermediate layer is a synthetic resin sheet (2) using a waste material, and the waste material synthetic resin sheet (2) is used as a base material for its surface side and inner surface side. An extremely thin synthetic resin film (1) made of a new material,
(7) is formed by a composite web (9) laminated respectively, the front and back surfaces of both parts (A), (B) and the bent part (4d) are made of a new synthetic resin film (1), The structure is covered by (7). The synthetic resin film (1) on the front surface side of the container may be pre-printed on the front surface side or the inner surface side thereof before the formation of the composite web (9).

The structure of the fourth invention relating to the manufacturing method comprises a synthetic resin sheet (2) which is a basic material formed by using a waste material,
Two extremely thin synthetic resin films (1) and (7) formed by using a new material are used, and these extremely thin both synthetic resin films (1) and (7) are used respectively for the waste material synthetic resin sheet (2 ) Is adhered to both front and back surfaces to form an integrated three-layer composite web (9), and the composite web (9) formed in the first step is arranged at a position in the extension direction of the first step. Molding machine (10)
The second step of transferring between the molding dies (10a) and (10b), and the new material synthetic resin film (7) is positioned on the inner surface side of the container, and the lid portion (A) of the container after molding And the composite web part (9a) corresponding to the third step (9a) and the composite web part (9b) corresponding to the body part (B) of the container. 4) is subsequently moved to the position of the cutting machine (12), and the fourth step of cutting and separating into single container (K) is sequentially and sequentially performed in this order. New synthetic resin film on the front side (1)
Alternatively, the desired character pattern or the like (C) may be printed in advance on the front surface side or the inner surface side thereof before the formation of the composite web (9).

The materials for forming the composite web (9) according to the present invention are the synthetic resin sheet (2) made of waste material and the synthetic resin film (1), (7) made of new material, respectively. Only the synthetic resin sheet (2) using the waste material and the means for extruding from the die are extruded from the synthetic resin extruder, and the synthetic resin film (1) and (7) using the new material are ready-made or separately manufactured. There are means for using the materials, and means for using both the synthetic resin sheet (2) using the waste material and the synthetic resin films (1) and (7) using the new material that are already manufactured or separately manufactured. Further, the sheet-shaped material extruded from the extruder, before forming the composite web (9), or after the formation until it is transferred to the molding machine (10), or during the stretching step. By adding and stretching, it is possible to obtain a material that is strong for its thickness. In this case, it is necessary that the thickness extruded from the die be thicker than the final thickness in consideration of the fact that the original sheet is thinned by the stretching process.

[0012]

In the container according to the first aspect of the invention, the entire surface for storing food, and in the container according to the second aspect of the invention, the entire inner and outer surfaces of the container are coated with a new material. Despite being the container used as, it is possible to obtain an extremely clean container and use it in the same manner as a container formed by using a new material. In addition, if necessary printing such as letters and designs is previously applied to the sheet side surface of the film to be laminated on the surface side of the waste material sheet forming the base layer, the letters and the like are put on the outside of the lid portion through the highly transparent film. In addition to being able to see through, it is possible to use hygienically without the risk that the printing ink that may contain harmful components will come into contact with the food to be packaged or the hand.

[0013]

Embodiments will be described below with reference to the drawings. For convenience of description, a method of manufacturing the container of the second invention will be described. In the embodiment shown in FIG. 1, an extruder (not shown)
From a horizontally long die (D) having a slit-shaped opening at the tip, a semi-transparent polystyrene resin in which waste material pellets have been melted is extruded, and unstretched strip-shaped waste material synthetic resin while being drawn by take-up rollers (6a) and (6b). Form the sheet (2). In this embodiment, the melt extrusion conditions are set so that the sheet (2) has a thickness of 0.5 mm. On the other hand, the synthetic resin film (1) made of polypropylene, which is an extremely thin and transparent new material with a thickness of 0.03 mm, is fed through the supply rollers (3a) and (3b) arranged on the upstream side to the take-up roller. To the rollers (6a), (6b),
Merge with the sheet (2). At this point, since the resin of the sheet (2) is in a semi-molten state, the abutting surfaces are fused and integrated with each other while being pressed by the rollers (6a) and (6b) to form an unstretched composite. A web (5) is formed in the first step.

In the film (1) to be laminated on the lower surface of the sheet (2) in the first step, a desired character pattern (C) is previously printed on the back surface (upper surface in the drawing) by mirror image printing. I am doing it. Therefore, the printing ink is enclosed between the film (1) and the sheet (2). Further, the take-up rollers (6a), (6b) and the stretching rollers (8a), (8b) described later,
In order to avoid adhesion to the resin in a semi-molten or plastic state, for example, a release material such as silicone rubber is lined on the surface of the steel pipe.

Next, the composite web (5) is passed between the stretching rollers (8a) and (8b) whose diameter is larger than that of the above-mentioned take-up rollers (6a) and (6b) and the number of rotations is also adjusted to a predetermined value. Is stretched. In this example, the stretching ratio was adjusted to 2.0, and the thickness of the composite web (5) after stretching was about 0.26 mm. This stretching operation is not necessarily a necessary operation, a separate take-up roller is arranged in front of the take-up rollers (6a), (6b), and the sheet (and the take-up rollers (6a), (6b) between the take-up rollers (6a), (6b). Only 2) may be stretched. In this stretching step, from the upper side of the web (5) to between the stretching rollers (8a) and (8b), the film is made of polypropylene like the film (1) and has a thickness of 0.0.
3mm thin and transparent non-printing new synthetic resin film (7)
Are supplied to the upper surface side of the sheet (2). Therefore, the film (7) pressed by the stretching rollers (8a), (8b) is fused to the sticky sheet (2) exposed on the upper surface of the web (5). In this way, both sides of both films
A composite web (9) laminated with (1) and (7) is formed.

Subsequently, in the second step, the composite web (9) is transferred to the molding machine (10) arranged in the extension direction thereof. In the third step, a pair of molding dies facing each other of the molding machine (10)
By (10a), (10b), the required uneven shape is given to the web part (9a) corresponding to the lid part (A) of the container and the web part (9b) corresponding to the body part (B), respectively. Web (9)
4 rows of uncut containers connected in the horizontal and horizontal directions (11)
To form. In the embodiment, the molding machine (10) is composed of a pair of upper and lower molds (10a) and (10b) for vacuum forming, and both molds have arrows (T).
The vertical approach and separation shown by and the forward and backward movement shown by the arrow (Y) are performed. That is, the mold is matched at the molding initial position on the upstream side, and a predetermined distance from the initial position is moved toward the downstream side according to the molding speed of the composite web (9), and molding is performed during the movement toward the downstream side. After that, the mold is opened on the downstream side, and the operation of quickly returning to the molding initial position is repeated. In this way, molding is performed while synchronously moving with respect to the composite web (9) flowing continuously.

In the final fourth step, the uncut container group after molding
The (11) is passed through a cutting machine (12), and the uncut container group is cut between the transverse direction and the individual containers connected in the traveling direction to obtain a plurality of single container (K). The cutting machine (12) comprises a blade die and a receiving die, but may be a high frequency fusing type or other means. Cut-away single container (K)
Are boxed and packaged by a predetermined number via a chute (not shown).

In this embodiment, as shown on the downstream side of the cutting machine (12) in FIG. 1, the adjacent lid portions (A) are back to back, and the adjacent body portions (B) are back to back. Each of the three-dimensional shapes of concavities and convexities is imparted by the molding machine so that However, the containers in each row have the same posture,
You may shape so that (A) and a body part (B) may have the same posture. In the embodiment, the single container group is shown to be formed in four rows, but it is not necessary to form a plurality of rows at the same time, one row may be formed depending on the width of the composite web (9), and a width of four rows or more. You may shape with.

As shown in FIGS. 2 to 5, the structure of the synthetic resin container manufactured by the above method is shown as an egg container for storing 5 eggs × 2 rows = 10 in this embodiment.
The container of this example has a lid portion, as seen in FIG.
Character patterns etc. (C) are arranged on the flat top plate part (4a) of (A), and adjacent semi-elliptic spherical parts for inserting the lower half of the egg are seen in the body part (B) as shown in FIG. The structure is such that the pyramidal trapezoidal pillars (4c) are projectingly provided at the portions where the corner angles of the recesses (4b) are gathered. Further, a cutting / unsealing thread (4d) for facilitating the unsealing is provided in the connecting portion between the lid part (A) and the body part (B), and the reference numeral in the figure
(4e) is a score line provided to form the knob portion of the unsealing thread (4d) at the time of unsealing.

As described above, the lid part (A) and the body part (B) both having the required three-dimensional shape of concavo-convex are the same composite web (9) based on the waste synthetic resin sheet (2) having low transparency. , A new material synthetic resin sheet (1), which is transparent on both inside and outside
(7) (Refer to the reference numerals in FIGS. 1 and 5). That is, in the container, the container forming the lid portion (A) and the body portion (B) is formed on the entire surface of the synthetic resin sheet (2) using the waste material on the food storage space forming side and on the side exposed to the outside. The entire surface is the above-mentioned transparent new synthetic resin film
It is polymer-coated with (1) and (7). Further, as shown in FIG. 5, characters, figures, etc. are formed on the surface of the new synthetic resin film (1) on the front surface side facing the synthetic resin sheet (2) corresponding to the lid portion (A) ( The required printing of C) is mirror-image printed, and printing ink is enclosed inside the composite web portion (9a) forming the lid portion (A). Therefore, there is no risk that the printing ink such as the characters will come into contact with the food, and the ink can be clearly seen through from the outside of the lid. Furthermore, at the time of storing food such as eggs in the container and thereafter,
The food to be contained does not come into contact with the background of the waste material synthetic resin sheet (2), so that there is no possibility that harmful substances that may be contained in the waste material sheet contaminate the food.

FIG. 6 shows an embodiment of a manufacturing method for manufacturing the container of the first invention. The synthetic resin film made of a new material on the surface side (lower side in FIG. 1) in the embodiment of FIG.
The use of (1) is omitted, and in the first step, only the synthetic resin sheet (2) using the waste material as the base material is taken up by the take-up rollers (6a), (6b) and the stretching rollers (8a), (8b). ), While drawing the synthetic resin film (7) made of a new material from the upstream side of the drawing rollers (8a), (8b) at the same time while being drawn between the drawing roller and the upper surface side of the waste material synthetic resin sheet (2). New synthetic resin film
(7) is bonded and integrated to form a two-layer composite web (9) consisting of a waste material synthetic resin sheet (2) and a new material synthetic resin film (7). The molding means is for manufacturing the container by the same means as shown in the embodiment of FIG.

The shape of the container formed is the same as that of the container shown in FIG. 1, and is shown as the same as the container shown in FIGS. However, in terms of structure, the outer surface of the container is
The waste synthetic resin sheet (2) is not covered. However, the inner surface of the container is entirely covered with the above-mentioned new material synthetic resin film (7). In each of the above embodiments, the container type is a container for packaging eggs, and the shape is shown for 5 pieces × 2 rows = 10 pieces. However, for example, a container for 6 pieces × 2 rows = 12 pieces may be used. The container for 5 pieces × 3 rows = 15 pieces may be used for other pieces, and the container referred to in the present invention is not limited to the egg packaging container, and other foods may be used. It goes without saying that it may be a container having an uneven shape suitable for housing.

The synthetic resin sheet (2) made of waste material forming the composite web (9) is used as an unstretched sheet by stretching it at an appropriate ratio as described in the examples. The mechanical strength of the molded container can be improved as compared with the conventional one.

Although the above is a typical embodiment of the present invention, it can be modified as appropriate within the range in which the above-mentioned constitutional requirements are met and the above-mentioned object is achieved and the following effects are exhibited. For example, the sheet (2) may be formed by blending a waste synthetic resin pellet with a new synthetic resin pellet in an appropriate ratio. In addition, additional drawing rollers are used for the die (D) and take-up rollers (6a), (6b).
By interposing between the sheet and the sheet, the outer film (1) may be laminated after the stretching of the sheet (2).
It is also possible to print the film (7) on the inner surface side so that the design or the like can be seen on the inner surface when the container is opened.

[0025]

As is clear from the above description, in the method of the present invention, the production efficiency is very high, and in particular, although the waste synthetic resin is used as the base material, the sheet material of only the new material is used. It is possible to manufacture a container at exactly the same speed as when manufacturing a container using, and since one side or both sides are covered with the film of the new material, the sheet thickness is also compared to the sheet material of the new material only. It is possible to give sufficient strength without making it excessively thick. In addition, since the inner or both sides of the sheet material are covered with a new laminated film in this way, waste material is used as a basic material, but it is extremely hygienic, and the use of new material is minimized. There are great advantages that can be stopped.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a manufacturing method.

FIG. 2 is a perspective view showing an embodiment of a container in an open posture.

FIG. 3 is a perspective view of the container in a closed posture.

FIG. 4 is a central sectional view of FIG.

5 is an enlarged cross-sectional view of an imaginary circle F in FIG.

FIG. 6 is a perspective view showing another embodiment of the manufacturing method.

[Explanation of symbols]

 (1) Synthetic resin film (2) Synthetic resin sheet (3a) (3b) Supply roller (5) Polymerization web (6a) (6b) Take-up roller (7) Synthetic resin film (8a) (8b) Stretching roller (9) Composite web (10) Molding machine (11) Uncut container group (12) Cutting machine (K) Single container (A) Container lid part (B) Container body part (C) Character display (D) Die

Claims (6)

[Claims] 1. A lid portion (A) having a space for accommodating a desired food product and a body portion (B) having a space for accommodating a food product are swingably opened and closed with a bent portion (4d) as a fulcrum. A container made of synthetic resin sheet that is formed in an integrated manner, in which a two-layer sheet material is used as a forming material, and the entire layer on one side is a synthetic resin sheet (2) material using waste material, The waste material synthetic resin sheet (2) is used as a base material, and the inner surface side is formed of a composite web (9) laminated with an extremely thin synthetic resin film (7) formed of a new material, and both parts (A) of the container. , (B) and the whole of the bent portion (4d) on the food storage space forming side are covered with the new synthetic resin film (7). 2. A lid portion (A) having a space for accommodating a desired food product and a body portion (B) having a space for accommodating a food product are swingably opened and closed with a bent portion (4d) as a fulcrum. A synthetic resin sheet that is formed in a specific manner, in which a three-layer sheet material including a surface layer, an intermediate layer, and an inner surface layer is used as a forming material, and the intermediate layer is entirely made of waste material. (2) The waste synthetic resin sheet (2) is used as a base material, and an extremely thin synthetic resin film (1), (7) formed of a new material is laminated on the surface side and the inner surface side, respectively. Formed from a composite web (9), both parts (A),
A synthetic resin food container in which the entire front and back surfaces of (B) and the bent portion (4d) are covered with the synthetic resin films (1) and (7) using the new material. 3. A new synthetic resin film (1) on the front side,
The synthetic resin container according to claim 2, wherein a predetermined character symbol or the like (C) is printed in advance on the front surface side or the inner surface side of the composite web before forming the composite web. 4. An extremely thin synthetic resin film using a synthetic resin sheet (2) which is a basic material formed by using waste materials and an extremely thin synthetic resin film (7) formed by using a new material. A first step of forming a two-layer composite web (9) by adhering (7) to one surface side of the waste material synthetic resin sheet (2), and a composite web (9) formed in the first step
The second step of moving the mold between the molding dies (10a), (10b) of the molding machine (10) arranged at the position of the extension direction of the first step, and the new material synthetic resin film (7) on the inner surface side of the container. The composite web portion (9a) corresponding to the lid portion (A) of the container after molding and the composite web portion (9b) corresponding to the body portion (B) of the container, respectively. A third step of forming and imparting a concavo-convex shape, and a fourth step of successively moving the molded composite web (9) thus molded to the position of the cutting machine (12) and cutting and separating it into a single container (K). A method for producing a synthetic resin food container in which the above steps are successively performed in this order. 5. A synthetic resin sheet (2), which is a basic material formed by using a waste material, and two extremely thin synthetic resin films (1), (7) formed by using a new material. A first step of adhering these extremely thin synthetic resin films (1) and (7) to both front and back surfaces of the waste synthetic resin sheet (2) to form an integrated three-layer composite web (9), The first
The second step of transferring the composite web (9) formed in the step between the forming dies (10a), (10b) of the forming machine (10) arranged in the extension direction position of the first step, and the new material synthetic resin With the film (7) located on the inner surface side of the container, the composite web part (9a) corresponding to the lid part (A) of the container after molding and the composite web part corresponding to the body part (B) of the container ( 9b) and the third step of forming the required concavo-convex shape respectively, and the molded composite web (9) is subsequently moved to the position of the cutting machine (12) and cut into individual containers (K). A method for producing a synthetic resin food container in which the four steps are successively performed in this order. 6. The new synthetic resin film (1) on the surface side,
The method for producing a synthetic resin container according to claim 5, wherein a desired character pattern or the like (C) is printed in advance on the front surface side or the inner surface side of the composite web (9) before it is formed.