JPH06211229A - Synthetic resin container for packing food and manufacture thereof - Google Patents

Abstract

PURPOSE:To obtain a food container made of synthetic resin wherein required print is embedded inside thickness of the container so that it can be seen through from outside and a method for fabricating it. CONSTITUTION:A body of a container is made of a synthetic resin sheet material 2 utilizing wasted materials, while a lid is made of an integrated sheet as a basic material with a synthetic resin sheet material 1 utilizing new materials. A composite web 9 with a thin transparent new material synthetic resin film 7 which has required print on an inner face in advance is used to form a foldable container comprising a lid part A and a body part B connected, so that the print can be seen from outside through the lid A of the container.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a lid portion formed of a composite web portion based on a synthetic resin sheet having a high transparency formed of a new material, and a low transparency formed of a waste material. In general, a container formed by a series of foldable and lid parts formed of a composite web part based on a synthetic resin sheet, which is generally seen to be slightly colored, on both sides of the food storage space forming side. An extremely thin synthetic resin film formed of a new material on the surface is laminated on the entire surface of the sheet, and a synthetic resin container for food packaging in which a letter pattern etc. that can be seen through from the outside is printed on the lid part and its It relates to a manufacturing method.

[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 that the collection containers collected there be melted and appropriately reused 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 synthetic resin sheet using the waste material has a low transparency due to the inclusion of foreign matters and printing ink, and 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 synthetic resin film formed of a new material is laminated on the inner surface 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 improve the conventional technique based on the conventional technique as described above, and a synthetic resin sheet formed by using a waste material. While using as a base layer material,
By using the synthetic resin sheet part formed using a new material extremely effectively, the printing of character patterns etc. can be easily seen from the inside and outside of the container, and the printing ink etc. which may be harmful to food is used. To obtain a container that is protected from human touch.

A second object of the present invention is such a container, but in the manufacture thereof, it is as efficient as in the case of manufacturing the container by using a material sheet formed of only a new material for the entire container. It is to provide a manufacturing method capable of manufacturing.

A third object of the present invention is to use a waste material as a basic material, but to provide a container in which all the inner and outer surfaces are hygienic, as in the case of a container in which the entire container is made of only a new material. And to provide a method of manufacturing such a hygienic container.

[0007]

The structure of a synthetic resin container for food packaging according to the first invention for achieving the above first object will be described with reference to the reference numerals in the drawings corresponding to the embodiments. The lid part (A) is formed from a composite web part (9a) based on a highly transparent synthetic resin sheet material (1) formed from a new material, and the body part (B) is formed from waste material It is made of a composite web part (9b) based on the synthetic resin sheet material (2) with low transparency, and both parts (A) and (B) can swing freely with their joint (4d) as a fulcrum. An integrally continuous container, both composite web parts (9a), (9b) for forming the lid part (A) and the body part (B) are the both synthetic resin sheet materials (1), (2). ) Is bonded to the base layer sheet (5) as a base material, and an extremely thin transparent synthetic resin film (7) formed using a series of new materials forms a food storage space. Of the new material synthetic resin film (7) on the side facing the base layer sheet (5) of the new material synthetic resin film (7) and corresponding to the new material synthetic resin sheet material (1). (C) is printed and the composite web portion forming the lid portion (A)
The printing ink is enclosed in the inside of (9a), and the character pattern (C) can be seen through from the outside of the lid portion (A).

The structure of the manufacturing method for achieving the second object is as follows: a synthetic resin sheet material (1) having a high transparency formed by using a new material and a synthetic resin sheet having a low transparency formed by using a waste material. A step of forming a base layer sheet (5) in which the material (2) is aligned in a state where their side edges are in contact with each other or partially polymerized, and the both side edges are adhered to each other to be connected in series in the width direction. , A very thin transparent synthetic resin film (7) formed using a new material that has the required character pattern etc. (C) arranged and printed on only one side in advance with the required spacing.
The printed surface is opposed to the surface of the base layer sheet (5), and the character pattern etc. (C) is positioned so as to face the highly transparent new synthetic resin sheet material (1). While contacting the base layer sheet (5), it is passed between a pair of pressure rollers (8a), (8b) arranged opposite to each other to form a composite web (9) integrally integrated with the base layer sheet (5). Step, and subsequently, the composite web (9) is formed by a pair of molding dies of a molding machine (10).
Between (10a) and (10b), a step of transferring so that the surface of the film (7) is located on the inner surface side of the container after molding, and the new material synthetic resin sheet by the molding machine (10) The composite web portion (9a) corresponding to the material (1) portion has an uneven shape forming the lid portion (A) of the container, and the composite web portion (9b) corresponding to the waste material synthetic resin sheet material (2) portion. ) In which the concave-convex shape for forming the body portion (B) of the container is provided to sequentially form the uncut container (11), and subsequently, the uncut container (11) is placed at the position of the cutting machine (12). The cutting machine (1
Separate the uncut container (11) by 2)
The step of separating into (K) is sequentially performed in this order.

Further, the structure of the container for achieving the third object is such that a new material in a series is used on the entire outer surface of the lid portion (A) and the body portion (B) of the container. Another transparent synthetic resin film (7A), which is extremely thin, is laminated and covered.The manufacturing method for the synthetic resin film (7) is the base layer sheet (5).
Adhere an extremely thin transparent synthetic resin film (7A) formed by using another new material on the surface opposite to the adhesive surface, and manufacture a container with the composite web (9) as a three-layered one. It was done.

The synthetic resin sheet material (1) using a new material and the synthetic resin sheet material (2) using a waste material for forming the base layer sheet (5) according to the present invention are separately separated before forming the base layer sheet (5). Or formed by extruding from a single synthetic resin extruder, or may be formed in advance.
Further, the sheet-shaped material extruded from the extruder, before forming the base layer sheet (5), or before forming the composite web (9), or after, or between these steps, by adding a stretching step. If it is stretched, it can be made into a material that is strong for its thickness. In this case, it is necessary to make the extrusion thickness from the die in the extruder thicker in consideration of the fact that the original sheet becomes thinner by the stretching process.

[0011]

In the container of the first aspect of the invention, the entire inner surface of the container is coated with a new material, and the printing of the character pattern (C) is enclosed between the coating material and the base material. , Since it can be used in a state in which the base layer material and the printing ink formed by using the waste material do not come into direct contact with the stored food, like the container formed by using only the new material,
Can be used as a clean container. In addition, since the required printing is done in advance, it is not necessary to attach a printing label etc. after molding the container, the labor and materials can be omitted, and the printing part can be seen from the outside of the lid part of the container Moreover, it can be used in a state where the printing surface is not contaminated or damaged by an external force.

[0012]

Embodiments will be described below with reference to the drawings. For convenience of description, the description will be given from the description of the manufacturing method of the second invention. Figure 1
Shows a first embodiment of the manufacturing method, in which a horizontal die (D1) having a slit-shaped opening in a synthetic resin extruder not shown
From this, a molten colorless transparent new material polystyrene resin is extruded, and a transparent unstretched new material synthetic resin sheet material (1) is formed in a band shape. From the other die (D2), the molten gray opaque waste material polystyrene resin is extruded, and the opaque unstretched waste material synthetic resin sheet material (2) is formed in a band shape.
Next, these original sheet materials (1) and (2) are aligned and the adjacent side edges are abutted or partially polymerized to form a joining roller.
Pass between (3a) and (3b). At this point in time, since both of these resin sheet materials are in a semi-molten state, they are fused and integrated with each other while being pressed by the rollers. This fusion-bonded portion serves as a folding joint (4d) between the lid portion (A) and the body portion (B) in the single container described later. In this way, the base layer sheet (5) is formed.

In this embodiment, the synthetic resin sheet material (1) using the new material has a width of approximately one container width from the center of the die (D1), and from both end sides of the die (D1). Push out the container with a width of about half the width of each container and put the synthetic resin sheet material (2) using the waste material at both sides of the die (D2) at the center of the container with an interval of about 1 width. One in a container
By extruding a sheet having a width corresponding to the width, a base layer sheet (5) having an overall width corresponding to 4 widths of the container is formed. The melt extrusion conditions are set so that the extruded thickness of both sheet materials (1) and (2) is about 0.5 mm.

In order to avoid sticking to the resin in the semi-molten or plastic state, not only the joining rollers (3a) and (3b), but also the stretching rollers (6a) and (6b) and the pressing roller (8) described later.
Also in a) and (8b), for example, a release material such as silicon rubber is lined on the surface of a stainless steel pipe.

Next, the base layer sheet (5) is passed between the stretching rollers (6a) and (6b) which have substantially the same diameter as the joining rollers (3a) and (3b) and a large number of rotations, and a predetermined magnification. Is stretched. In this example, the draw ratio is 2.0 times. Therefore, the thickness of both sheet materials (1) and (2) of the base layer sheet (5) is about 0.25m.
m thickness.

Base layer sheet (5) stretched in this way
Of the pressure rollers (8a), (8a)
Transfer during b). In this step, a desired character pattern or the like (C) is printed on one side in advance at a predetermined interval, and a transparent material formed of a new material extremely thinner than the predetermined thickness of the base layer sheet (5). At the same time, the synthetic resin film (7) is guided and transferred between the pressing rollers (8a) and (8b) to be laminated on the surface of the base layer sheet (5). At this time, the printed surface of the film (7) faces the base layer sheet (5), and the printed portion faces the position of the new material sheet material (1) forming the base layer sheet (5). In this way, it is fed between the pressure rollers (8a) and (8b). In this embodiment, the film (7) is a polypropylene film having a thickness of about 0.03 mm, and the stretched base layer sheet (5) and the pressing roller are still in the state of having plasticity and tackiness.
(8a) and (8b) are pressed and bonded to each other to form a two-layer composite web (9) which is a series of one body.

Subsequently, the composite web (9) is transferred to a molding machine (10) arranged in its extension direction, and is moved by a pair of molding dies (10a), (10b) facing each other of the molding machine (10). , The web part (9) corresponding to the synthetic resin sheet material (1) using the new material
The uneven shape that forms the lid part (A) of the container in (a) is changed to the web part (9) corresponding to the synthetic resin sheet material (2) using the waste material.
Uneven container groups (11) for four rows of containers are formed by forming the uneven shapes for forming the body part (B) of the container in b) respectively, and connecting the traveling direction and the cross direction of the composite web (9). Form. As an example, the molding machine (10) is a pair of upper and lower molds for vacuum forming.
(10a) and (10b), both molds perform approach and separation in the vertical direction indicated by arrow (T) and forward and backward movement indicated by arrow (Y). That is, the mold is closed at the original position on the upstream side, and a predetermined distance from this original position proceeds to the downstream side at the same speed as the traveling speed of the web (9), molding is performed during this progress, and the mold is opened on the downstream side. Then, the operation of quickly returning to the original position is repeated.
In this way, the forming operation is performed synchronously with respect to the continuously flowing web (9).

Finally, the uncut container group (11) thus formed is transferred to the cutting machine (12) on the downstream side, and individual containers of the container group (11) connected in the transverse direction and the advancing direction. Cut between them to separate into a single container (K). The cutting machine (12) is composed of a blade die and a receiving die, but may be a high frequency fusing type,
Other types may be used. The separated individual containers (K) are sent to a packing device via a chute, a transfer conveyor, and the like (not shown), and are packed in a predetermined number of boxes.

In this embodiment, as shown near the dies (D1) and (D2) in FIG. 1, the lid portion (A) 1
New synthetic resin sheet material with individual width (1), body part (B)
2 widths of waste synthetic resin sheet material (2), lid part (A) 2 widths of new synthetic resin sheet material (1), body part (B) 2 widths of waste synthetic resin sheet material ( 2), Lid part (A) Melt extrusion molding is performed with an array of one width of new material synthetic resin sheet material (1), four rows of containers are molded at the same time, and lid or body part 2
The intermediate position of the sheet having the width of each piece is cut (s) in the traveling direction. However, the width of the number of molded containers does not have to be four rows, but at least one row,
Molding may be performed in four or more rows, for example, six rows or ten rows, which corresponds to the width of the machine.

An example of the synthetic resin container according to the first invention obtained by the method of the above embodiment is shown in FIGS. The container of the embodiment shown here is shaped to accommodate 5 eggs × 2 rows = 10 eggs. The shape of this container is such that the lid part (A) and the body part (B) are made into an uneven shape suitable for accommodating other foods by making the uneven shape of the molding die (10) different. Of course

In this container, the lid portion (A) having a desired three-dimensional shape of projections and depressions is made of a synthetic resin sheet material (1) having high transparency (a reference numeral in FIG. 1, the same applies hereinafter) using a new material as a base layer. A composite web portion formed of a composite web portion (9a), and a body portion (B) having a required uneven three-dimensional shape in the same manner and having a relatively low transparency synthetic resin sheet material (2) using waste material as a base layer ( 9b) so that both parts (A) and (B) can be swingably opened and closed with their joint (4d) as a fulcrum.

Thus, this container comprises both said composite web parts (9) for forming said lid part (A) and body part (B).
a), (9b) is a transparent new material that is connected in series to the entire surface of the food storage space forming side of both synthetic resin sheet materials (1) and (2), that is, the entire inner surface of the container. Synthetic Resin Film (7)
The above-mentioned synthetic resin sheet material using the new material (1) in which the required character pattern etc. (C) is pre-printed on the film (7) and the printed surface corresponds to the lid part (A). Since it is aligned with the side facing the), the printing ink is enclosed inside the composite web portion (9a) forming the lid portion (A), the character pattern (C) There is no risk of the printing ink coming into contact with the hands or food, which is hygienic, and the printed characters can be clearly seen from the outside of the lid.

As shown in FIG. 2, the container of this embodiment is
Character patterns etc. (C) are arranged on the flat top plate part (4a) of the lid part (A), and the corner parts of the concave part (4b) for inserting the lower half of the egg are gathered on the body part (B). It has a structure in which a pyramidal trapezoidal pillar (4c) is projected at the position. In addition, at the connecting portion (4d) between the lid portion (A) and the body portion (B), a cutting and unsealing thread for facilitating the unsealing.
(4f) is provided, and the reference numeral (4e) in the figure is a score line for facilitating the gripping of the opening thread (4f) when opening the container.

FIG. 4 shows another embodiment for manufacturing the composite web (9), which uses a new material having a width necessary to form one lid part (A) of the container from the die (D1). Extrude the three bands of synthetic resin sheet material (1) at a predetermined interval and press
Three bands of waste synthetic resin sheet material (2) having a width required to form one body portion (B) of the container from (D2) are alternately arranged in the width direction with the sheet material (1). The strips are arranged and extruded in this manner, and the respective strips are integrally fused in the width direction to form a base layer sheet (5) for the width of the container 3, and the required printing shown in the manufacturing method of FIG. The synthetic resin film (7) is adhered, and an extremely thin transparent synthetic resin film (7A) with a thickness of 0.02 mm made of a new material is also adhered to the lower surface side to simultaneously form containers in three rows. A three-layer width composite web (9) is produced. The other points are similar to those of the embodiment shown in FIG. In addition, on the right downstream side of the figure, the container 1
Composite webs (9) sized to form individual pieces are shown separately for reference.

The base layer sheet (5) referred to in the present invention, as described in the embodiment of FIG. 1, is stretched at an appropriate ratio to form a machine for a container which is molded as compared with an unstretched sheet. There is an advantage that the physical strength can be improved.

The above is a typical embodiment of the present invention, but it can be implemented by appropriately modifying it within a range that has the above-mentioned constitutional requirements and achieves the above object and has the following effects. For example, in the embodiment of FIGS. 1 and 4, each die (D
Instead of 1) and (D2), the material sheet may be extruded as an integral type by one extruder, or a preformed base layer sheet (5) may be used.

[0027]

As is apparent from the above description, in the container of the present invention, a synthetic resin film using a series of transparent new materials is polymer-bonded to the entire inner surface of the container, and the film is adhered to the film. Required characters and patterns are printed in advance, and the printing surface is aligned with the side facing the lid, so the printing ink is sealed inside the wall thickness of the lid of the container. As a result, there is no risk that the printing ink such as a character pattern will come into contact with the hand or food, which is hygienic, and the printed character can be clearly seen through from the outside of the lid. Moreover, there is no fear that the printed portion will be damaged or soiled by external force and become difficult to read. In addition, the contents of the container can be easily confirmed from the lid portion, even though the waste synthetic resin material is used in combination.

Further, in the manufacturing method, the container on which the above-mentioned required printing is applied is manufactured with high production efficiency as in the case where the conventional synthetic resin material made of only new material is used. In addition, there is an advantage that it is possible to omit the need for attaching a label or the like on which a desired print is applied after the manufacturing of the container and the number of steps or steps. Moreover, there is an advantage that such a sticking label is not required.

[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 the container in an open posture.

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

FIG. 4 is a perspective view showing another embodiment of the manufacturing method.

[Explanation of symbols]

 (1) Synthetic resin sheet material (2) Synthetic resin sheet material (4d) Joining part (5) Base layer sheet (7) Synthetic resin film (8a) (8b) Pressing roller (9) Composite web (9a) (9b) Composite Web part (11) Uncut container (12) Cutting machine (K) Single container (A) Container lid part (B) Container body part (C) Character display (D1) (D2) Die

Claims (4)

[Claims] 1. A lid portion (A) having a required three-dimensional shape of unevenness.
Highly transparent synthetic resin sheet material formed using a new material
(1) is formed of a composite web portion (9a) as a base layer, the body portion (B) similarly having a desired uneven three-dimensional shape is formed of a waste material with a low transparency synthetic resin sheet material (2) It is composed of a composite web part (9b) as a base layer, and both parts
(A) and (B) are containers in which a lid portion (A) and a body portion (B) that are swingably continuous about the joint portion (4d) as a fulcrum are integrally formed, and the lid is The composite web portion (9a), (9b) for forming the portion (A) and the body portion (B) is a base layer sheet (5) in which the both synthetic resin sheet materials (1), (2) are joined. An extremely thin transparent synthetic resin film (7) formed by using a series of new materials as a base material is polymer-bonded to the entire surface of the food storage space forming side, and the base layer of the new material synthetic resin film (7) A required character pattern etc. (C) is printed on a portion of the surface facing the sheet (5) side corresponding to the new synthetic resin sheet material (1) to form the lid portion (A). Composite web part
A synthetic resin container for food packaging, in which printing ink is enclosed inside (9a), and the character pattern (C) can be seen through from the outside of the lid portion (A). 2. The outer surface of the lid (A) and the body (B) of the container is also covered with another extremely thin transparent synthetic resin film (7A) formed by using a series of new materials. The synthetic resin container for food packaging according to claim 1. 3. The synthetic resin sheet material (1) having a high transparency formed by using a new material and the synthetic resin sheet material (2) having a low transparency formed by using a waste material are in contact with each other at their side edges. Or a step of forming a base layer sheet (5) connected in series in the width direction by aligning both side edges so that they are partially polymerized and adhering to each other, and a predetermined character pattern etc. (C)
An extremely thin transparent synthetic resin film formed by using a new material that has been printed with the required spacing on only one side
(7), so that the printing surface is opposed to the surface of the base layer sheet (5), and the character pattern etc. (C) is positioned to face the highly transparent new synthetic resin sheet material (1) portion. In this way, while abutting on the base layer sheet (5), it is passed between a pair of pressure rollers (8a), (8b) arranged to face each other, and the base layer sheet (5) and a series of integrated composite web (9). ) Is formed, and subsequently the composite web (9) is formed into a pair of molding dies of a molding machine (10).
Between (10a) and (10b), a step of transferring so that the surface of the film (7) is located on the inner surface side of the container after molding, and the new material synthetic resin sheet by the molding machine (10) The composite web portion (9a) corresponding to the material (1) portion has an uneven shape forming the lid portion (A) of the container, and the composite web portion (9b) corresponding to the waste material synthetic resin sheet material (2) portion. ) In which the concave-convex shape for forming the body portion (B) of the container is provided to sequentially form the uncut container (11), and subsequently, the uncut container (11) is placed at the position of the cutting machine (12). The cutting machine (1
Separate the uncut container (11) by 2)
A method for producing a synthetic resin container for food packaging, which comprises sequentially performing the step of separating into (K). 4. An extremely thin transparent synthetic resin film in which a composite web (9) is formed by using another new material on the surface of the base layer sheet (5) opposite to the surface where the synthetic resin film (7) is bonded. (7
The method for producing a synthetic resin container for food packaging according to claim 3, wherein A) is adhered to form a three-layered product.