JPH07106744B2 - Synthetic resin container for food packaging and manufacturing method thereof - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a container in which a lid portion and a body portion of the container are foldably connected in series, and only a part of the lid portion is made of a new material. A synthetic resin sheet having a high transparency is used as a base layer, and the other parts of the lid portion and the whole body are formed using a synthetic resin sheet having a low transparency formed by using a waste material as a base layer. An extremely thin synthetic resin film formed of a new material is laminated on the entire surface of the storage space forming side, and a synthetic resin container for food packaging that allows the inside of the container to be seen through from the synthetic resin sheet part using the new material in the lid part. And its 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. It is desired to melt the collection containers collected there and appropriately reuse them 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 its slightly colored and opaque nature, it is used as a molding sheet for only the body 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 utilize even more waste materials based on the above conventional techniques, and to use new materials. The width of the synthetic resin sheet formed by making it as narrow as possible, and effectively using the synthetic resin sheet part formed by using the waste material as wide as possible, yet it is a container You can easily check the condition of the food stored inside the container from the outside of the
Moreover, it is intended to obtain a hygienic container in which impurities contained in a waste material which may be harmful to food are protected from being directly contacted with food.

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 make extensive use of waste material as a basic material, but as in the case of a container in which the entire container is made of only new material, all inner and outer surfaces are sanitary. Another object of the present invention is to provide such a container and a method for producing such a completely 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. A composite web portion based on a highly transparent synthetic resin sheet material (1) formed by using a new material for a portion including at least a central portion in the width direction of the portion (A) over a whole length in the longitudinal direction by a predetermined width. (9a), the remaining part of the lid part (A) and the entire body part (B) are formed of waste material with low transparency synthetic resin sheet material (2) as a base layer It is formed of a composite web portion (9b), these both portions (A), (B), the base layer sheet (5), which is a combination of the both synthetic resin sheet materials (1), (2), as a base material, An extremely thin transparent synthetic resin film (7) made of new material is polymer-bonded to the entire surface of the food storage space forming side. It is formed of a compound web (9), and has a structure in which the inside of the container can be seen through from the portion of the synthetic resin sheet (1) using the new material in the lid portion.

The construction of the manufacturing method for achieving the above second object is that the synthetic resin sheet material (1) made of a new material and having a high transparency and a narrow width, and the low transparency formed by a waste material. A wide width synthetic resin sheet 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 form a base layer sheet (5 connected in series in the width direction. ), And an extremely thin transparent synthetic resin film separately formed using a new material
While contacting (7) to the base layer sheet (5), the base layer sheet (5)
Together with a pair of pressure rollers (8a), (8
A step of forming a two-layer composite web (9) by passing between b), and subsequently, the composite web (9) between a pair of molds (10a), (10b) of a molding machine (10), A step of transferring so that the surface of the film (7) is positioned on the inner surface side of the container after molding, and a composite web corresponding to the new material synthetic resin sheet material (1) part by the molding machine (10). In the portion (9a), the portion including at least the central portion in the width direction of the lid portion (A) of the container is unevenly formed over the entire length in the longitudinal direction, and corresponds to the waste synthetic resin sheet material (2) portion. In the composite web part (9b), a step of forming the uncut container (11) successively by forming unevenness on the entire remaining part of the lid part (A) and the whole body part (B) of the container, and subsequently, A cutting machine (12) for the uncut container (11)
The step of moving to the position of, and the step of cutting between the uncut containers (11) by the cutting machine (12) to separate into a single container (K) are 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 narrow-width synthetic resin sheet material (1) using a new material and the wide-width synthetic resin sheet material (2) used for forming the base layer sheet (5) according to the present invention are the same as the base layer sheet (5). Before forming, they may be formed by extrusion from separate or one synthetic resin extruders, or may be formed in advance. The sheet material extruded from the extruder is stretched by adding a stretching step before forming the base layer sheet (5) or before or after forming the composite web (9), or between these steps. If it is kept, it can be 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 in the stretching step.

[0011]

In the container of the first aspect of the present invention, since the entire inner surface of the container is covered with the film-like material made of a new material, the sheet material made of the waste material is directly attached to the stored food. Since it can be used without contact, it can be used as a clean container as well as a container formed using only a new material. In addition, when the required printing is applied to the inner surface coating material in advance, it is not necessary to attach a printing label or the like after molding the container,
There is an advantage that the labor and materials can be omitted, and the printed portion can be seen through from the outside of the lid portion of the container.
The printing surface can be protected so that it is not soiled or damaged by 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 molten colorless transparent new material polystyrene resin is extruded from a narrow horizontal die (D1) having a slit-shaped opening in a synthetic resin extruder (not shown). An unstretched new synthetic resin sheet material (1) having a small width and high transparency is extruded into a band shape. The molten opaque waste polystyrene resin is extruded from another wide die (D2), and the wide and opaque unstretched waste synthetic resin sheet material (2) is extruded into a band shape. Then
These original sheet materials (1), (2) are aligned and the adjacent side edges are abutted or partially polymerized to form the joining rollers (3a), (3
Pass between b). At this time point, since both of these resin sheet materials are in a semi-molten state, they are fused and integrated with each other while being pressed and pressed by the roller. The fusion-bonded portions are positioned on both sides in the center of the lid portion (A) in the width direction in the single container described later. In this way, the base layer sheet (5) is formed.

In the present embodiment, the synthetic resin sheet material (1) using the new material is formed into a container from both side portions near the center of the die (D1) and both portions near both ends of the die (D1). Approximately one quarter of the width, that is, about half the width of the lid portion of the container is extruded, and the synthetic resin sheet material (2) using the waste material is pushed from the center part of the die (D2) to about 4 One-third
The width of the container, about 1/4 width of the container on both sides of the container and about 1/4 width of the container on both sides, and about 1/8 width of the container on both ends. The base layer sheet (5) having an overall width corresponding to four widths of the container is formed by extruding the base layer sheet having a width. The extruded thickness of both sheet materials (1) and (2) is about 0.5.
The melt extrusion conditions are set to be mm.

In order to avoid sticking to the resin in a semi-molten or plastic state, the joining rollers (3a) and (3b), and the stretching rollers (6a) and (6b) and the pressing rollers (8a) and (8b) described later. ) Is
For example, the surface of a stainless steel pipe is lined with a release material such as silicon rubber.

Next, the base layer sheet (5) is passed between the stretching rollers (6a) and (6b) that have substantially the same diameter as the joining rollers (3a) and (3b) and the number of revolutions is increased, and a predetermined magnification is applied. Is performed. In this example, the draw ratio is 2.0 times. Therefore, the thickness of the base layer sheet (5) is about 0.25 mm.

Base layer sheet (5) stretched in this way
Of the pressure rollers (8a), (8a)
b) Transfer during (shown in phantom because the figure is complicated). Although omitted in the embodiment diagram, as shown in FIG. 4 which will be described later, a predetermined character pattern (C) is printed on one side in advance with a predetermined gap, and the predetermined pattern of the base layer sheet (5). A transparent synthetic resin film (7) made of a new material that is extremely thinner than the thickness is simultaneously guided and transferred between the pressing rollers (8a) and (8b), and is superposed on the surface of the base layer sheet (5). And laminate. At this time, the printed surface of the film (7) faces the base layer sheet (5), and the printed portion corresponds to the position of the sheet material (1) using the new material, which forms the base layer sheet (5). It is aligned so as to be positioned and fed between the pressing 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 (8a) are still in the state of having plasticity and tackiness. , (8b) are pressed and bonded to each other to form a two-layer composite web (9) integrally formed.

Next, the composite web (9) is transferred to a molding machine (10) arranged in its extension direction, and a web portion (9a) corresponding to the new synthetic resin sheet material (1) is formed. By positioning the lid portion (A) of the container so as to form a central portion in the width direction, the web portion (9b) corresponding to the waste material synthetic resin sheet material (2) is the body portion (B) of the container. And the lid part (A) are aligned so as to form both side parts except the central part, and a desired uneven shape is formed by the molding machine (10). An uncut container group (11) for four rows of containers connected to each other is formed. The molding machine (10) consists of a pair of upper and lower molds (10a), (10b) for vacuum forming or blow molding, and both molds have vertical arrows (T).
The approach and separation in the vertical direction indicated by and the forward / backward movement indicated by the horizontal arrow (Y) are performed. That is, the mold (10a), (10b),
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 mold opening is performed on the downstream side. The operation of promptly returning to the original position is repeated. In this way, the molding operation is performed intermittently while synchronously moving with respect to the continuously flowing web (9).

Finally, the uncut container group (11) thus formed is transferred to the cutting machine (12) arranged on the downstream side, and the individual container groups (11) connected in the transverse direction and the advancing direction. The space between the containers is cut (s) to separate a single container (K). Cutting machine (1
Although 2) consists of a blade die and a receiving die, it may be a high frequency fusing type or other type. 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, four rows of containers are shown to be molded at the same time, but the number of molding rows of containers is four.
It does not have to be a row at all, it may be at least one row, 4
Molding may be performed in an appropriate number of rows or more, for example, 6 rows or 10 rows corresponding to the size of the manufacturing apparatus.

2 to 3 show an example of the synthetic resin container according to the first invention obtained by the method of the above embodiment. The container of the example shown here is 5 eggs × 2 rows = 1
It has a shape to accommodate 0 pieces. 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

This container is a synthetic resin sheet having a high transparency, in which only a central portion of a half width of the lid portion (A) having the required three-dimensional shape (4a) of unevenness is made of a new material. A body formed of a composite web portion (9a) based on a material (1) (reference numeral in FIG. 1, the same applies hereinafter), and a body having a required uneven three-dimensional shape (4b) with other portions of the lid portion (A). The whole part (B) is formed of a composite web part (9b) based on a relatively low transparency synthetic resin sheet material (2) using waste material, and both parts (A), (B) Can be swingably opened and closed with a bent portion (4d) formed at an intermediate position where they are connected as a fulcrum.

Thus, in this container, the composite web (9) for forming the lid portion (A) and the body portion (B) has the above-mentioned both synthetic resin sheet materials (1), (2). Since the entire surface of the food storage space forming side, that is, the entire inner surface of the container, is made by polymerizing and adhering a series of transparent synthetic resin film (7) using a new transparent material, a synthetic resin using a waste material is used. The sheet material (2) does not come into direct contact with the stored food.

Further, the container of the embodiment is shown as a non-printed design etc. (C), but a container in which the required character design etc. (C) is pre-printed on the film (7) When used, the printed surface is aligned with the side facing the new synthetic resin sheet material (1) corresponding to the central portion in the width direction of the lid portion (A) (1), Since the printing ink is enclosed in the inside of the composite web portion (9a) forming the lid portion (A), there is no risk that the printing ink such as printing characters (C) will come into contact with food, and It is possible to see through clearly from the outside of the lid. Furthermore, since the base layer sheet (5) forming the composite web (9) is stretched before laminating the new material synthetic resin film (7) on the surface of the sheet, an unstretched sheet is used. Compared with the mechanical strength, it is strong relative to the thickness.

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. Further, a cut / unsealing thread (4f) for facilitating unsealing is provided in the bent portion (4d) between the lid portion (A) and the body portion (B). 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), in which the width of the lid portion is about 2 times from the die (D1) to the central portion in the width direction of the lid portion (A) of the container. Synthetic resin sheet material using a new material having the width required to form a one-half width (1)
Extrude the three strips at predetermined intervals and have the respective widths necessary to form the remaining portion of the lid portion (A) of the container and the body portion (B) from the die (D2). The four strips of waste synthetic resin sheet material (2) are arranged and extruded so that they are alternately positioned in the width direction with the sheet material (1), and each strip is formed in the width direction by a pair of joining rollers (3). The base layer sheet (5) for three widths of the container is formed by fusion bonding,
The transparent synthetic resin film (7) with a thickness of 0.02 mm, which was transferred between a pair of pressure rollers (8) and was subjected to the required printing at the same time, was supplied to the upper surface side and adhered, and a new material was also formed on the lower surface side. An extremely thin transparent synthetic resin film (7A) having a thickness of 0.02 mm formed in the above is supplied and adhered to produce a three-layer composite web (9) having a width capable of simultaneously forming three rows of containers. Is. Other points are similar to those of the embodiment shown in FIG. Incidentally, a composite web (9) having a size for forming one container is separated and shown on the right downstream side of the drawing for reference.

The container according to the present invention is shown as a container made of a synthetic resin sheet (1) made of a new material in the above-mentioned embodiment only by about half the width of the central portion of the lid portion (A). The width is about 3 depending on the shape of the container used and the type of food stored.
It may be about one third, or in some cases, about two thirds to three quarters. Further, the portion utilizing the synthetic resin sheet (1) made of a new material is not limited to only the central portion of the lid portion (A), the free end side of the lid including the central portion, that is, the bent portion (4d) When formed on the entire opposite side, the connection with the waste material utilization sheet (2) can be made to be one location per container, so that the production of the base layer sheet (5) is further facilitated. Base layer sheet (5)
As described in the example of FIG. 1, by stretching at an appropriate ratio, the mechanical strength of the molded container can be improved as compared with an unstretched sheet having the same thickness. is there.

The above is a typical embodiment of the present invention.
The present invention can be carried out by appropriately modifying it within the scope of achieving the above-mentioned object and having the following effects by providing the above-mentioned constituent requirements. For example, in the embodiment of FIGS. 1 and 4, each die (D
Instead of 1) and (D2), the entire material sheet may be extruded as an integral type by one extruder, or a preformed base layer sheet (5) may be used.

[0028]

As is apparent from the above description, in the container of the present invention, the entire other part of the container except a part of the lid part is formed by using the waste material. However, there is a great advantage that waste materials can be used to a large extent. And yet, because the synthetic resin film using a series of transparent new materials is polymer-bonded to the entire inner surface of the container, it is hygienic without the risk of waste materials coming into direct contact with food and stored in the container. The state of the food, for example, in the case of egg containers, the confirmation of the date of the small label indicating the production date attached to each egg in the container can be clearly seen from the outside of the lid. It does not spoil the benefits.

Further, the manufacturing method has an advantage that the container as described above can be manufactured with high production efficiency as in the case of using the conventional synthetic resin material made only of a new material. Also, by using the ultra-thin laminate film on the inner surface side of the container, which has been subjected to the required printing in advance, the printed surface does not come into contact with hands or food without affecting productivity. There is an advantage that the container can be manufactured, the number of steps for attaching the label after the container is manufactured, and the container that does not require such a sticking label can be manufactured.

[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 perspective view showing another embodiment of the manufacturing method.

[Explanation of symbols]

 (1) Synthetic resin sheet material (2) Synthetic resin sheet material (4d) Folding 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 (6)

[Claims] 1. 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 continuous, and their bent portions (4d) are fulcrums. A container that can be opened and closed in a swingable manner, and a synthetic resin sheet material with high transparency in which a portion including at least a central portion in the width direction of the lid portion (A) is formed by using a new material over the entire length in the longitudinal direction. A composite web part (9a) which can see through the inside of (1) as a base layer, and the rest of the lid part (A) and the whole body part (B) are waste materials. Synthetic resin sheet material with low transparency formed by using (2)
Is formed of a composite web portion (9b) having a base layer, and both of these portions (A) and (B) form a base layer sheet (5) in which the both synthetic resin sheet materials (1) and (2) are joined. A synthetic material for food packaging, which is made of a composite web (9) in which an extremely thin transparent synthetic resin film (7) made of a new material is polymer-bonded on the entire surface of the food storage space forming side as a base material. Resin container. 2. The extremely thin synthetic resin film (7)
The required character pattern etc. (C) is printed on the portion of the surface facing the base layer sheet (5) side corresponding to the new synthetic resin sheet material (1) to form the lid portion (A). internal to the printing ink in the inside and may perspective composite web portions (9a) is sealed, and claim 1 in which the character images, etc. (C) has a structure that can be projected from the outer lid portion (a) The synthetic resin container for food packaging according to. 3. An extremely thin transparent synthetic resin film (7A) made of a new material is polymer-bonded to the entire outer surfaces of the lid (A) and the body (B) of the container. , 3
The synthetic resin container for food packaging according to claim 1, wherein a layered web (9) is formed . 4. A synthetic resin sheet material (1) made of a new material and having a high transparency and a narrow width, and a synthetic resin sheet material (2) made of a waste material and having a low transparency and a wide width.
And the side edges thereof are brought into contact with each other or partially overlapped with each other so that the side edges are adhered to each other to form a base layer sheet (5) connected in series in the width direction. While contacting an extremely thin transparent synthetic resin film (7) separately formed using the base layer sheet (5),
A step of passing together with the base layer sheet (5) between a pair of pressure rollers (8a) and (8b) arranged to face each other to form a two-layer composite web (9), and subsequently, the composite web (9). ) A pair of molding dies (10
a) and (10b), the 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 material by the molding machine (10) In the transparent composite web portion (9a) corresponding to the portion (1), a portion including at least the central portion in the width direction of the lid portion (A) of the container is formed unevenly over the entire length in the longitudinal direction, and the waste material described above The composite web part (9b) corresponding to the synthetic resin sheet material (2) part is used to form concavo-convex parts on the remaining part of the lid part (A) and the whole body part (B) of the container, and the uncut container ( 11), followed by the step of moving the uncut container (11) to the position of the cutting machine (12), and cutting between the uncut containers (11) by the cutting machine (12). And the process of separating it into a single container (K) in this order. Producing the following methods performed for food packaging plastic containers. 5. The synthetic resin film (7) has a desired character pattern or the like (C) printed in advance on only one side of the synthetic resin film at a required interval, so that the inside can be seen through. In the step of forming the composite web (9), the printed surface faces the surface of the base layer sheet (5), and the character pattern (C) is the new synthetic resin sheet material (1) portion. The method for producing a synthetic resin container for food packaging according to claim 4 or 5, wherein the synthetic resin container for food packaging is placed at a position corresponding to and is integrally bonded to the base layer sheet (5). 6. A composite web (9) having a see-through inside ,
An extremely thin transparent synthetic resin film (7A) formed by using another new material is adhered to the surface of the base layer sheet (5) opposite to the surface to which the synthetic resin film (7) is adhered to form a three-layered one. A method for producing a synthetic resin container for food packaging.