JP2012218755A - Packaging double container including non-foam layer and foam layer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging double container for food which can be manufactured without changing a conventional manufacturing device and without using an adhesive while securing the integration and separation of two sheets.SOLUTION: The packaging double container 10 is molded by mutually laminating an inner layer 10a being a non-foam layer and an outer layer 10b being a foam layer followed by double vacuuming, and includes a bottom wall 11 and a side wall 12 raised from the periphery thereof. The side wall 12 includes an inclined surface 13 having a lower portion inclined from the inside of the container to the outside, the inclination θ of the inclined surface 13 is 15-80° relative to a perpendicular line 11a relative to the bottom wall 11, and the height H of the side wall 12 is 5-75 mm.

Description

  The present invention relates to a double container for packaging, and more particularly to a double container for packaging formed by using a non-foamed layer and a foamed layer having different functions or physical properties as materials.

  Double packaging containers that are molded from non-foamed layers and foamed layers with different functions or physical properties can be effective because they can have contradictory functions or physical properties. . For example, when storing hot “fried chicken” with freshly fried, ensure heat resistance by making the inside non-foamed layer, and ensure “heat retention” by making the outside foamed layer Can do.

  In addition, packaging double containers molded with materials with different functions or physical properties should keep the packaging form with a hard foam layer while keeping the contents away from oxygen with a soft non-foam layer. You can also. A “composite container” made under such a concept is proposed in Patent Document 1.

Japanese Unexamined Patent Publication No. 64-45258

In Patent Document 1, for the purpose of “preventing the contents from being deteriorated by oxidation, discoloration or drying by the air in the head space”
"Composite container made of plastic having a storage recess, characterized in that a rigid outer layer and a flexible inner layer are peelably bonded over the entire storage recess"
Has been proposed. And it is thought that this composite container can prevent the contents from being altered.

  However, since the composite container of Patent Document 1 is formed by “adhering a rigid outer layer and a flexible inner layer in a peelable manner”, in manufacturing the composite container, the “adhesion” An apparatus or a process for supplying an adhesive is required, and the design of the molding die needs to be changed significantly. A general molding machine that forms a sheet from a synthetic resin sheet cannot be used.

  In addition, if this composite container is used for packaging food, the choice of adhesives and solvents to be used is very limited in consideration of food safety, which increases the cost of the composite container. It must be considered.

  In general, food packaging containers are inexpensive and disposable, and are safe and sanitary, and if possible, they should not be deformed even when placed in a microwave oven. It is manufactured by sheet molding, that is, molding using a synthetic resin sheet as a material. In other words, food packaging containers are provided at low cost by avoiding the introduction of foreign substances by forming a sheet of a small number of materials to ensure the safety of stored food.

  In the sheet molding, the synthetic resin sheet, which is a material, is softened by heat so that the synthetic resin sheet is easily deformed into a shape corresponding to the molding die. Then, the synthetic resin sheets cannot be bonded to each other.

  And, in order to make the packaging containers for this kind of foods have mutually contradicting functions or physical properties, two synthetic resin sheets having different functions or physical properties are molded as materials. However, the problem is the integration of both synthetic resin sheets. This is because if both synthetic resin sheets are not integrated, they do not function as an independent container for storing food.

  On the other hand, disposable food packaging containers may be recycled as resources. For this purpose, it is advantageous that the materials constituting the containers are the same or the same. However, in a container made of two synthetic resin sheets having different functions or physical properties, the synthetic resin sheet is made of different materials. Therefore, when recycling, the two types of synthetic resin sheets are used. Contrary to time, it is convenient if it can be easily separated.

  Furthermore, if the volume of the disposable packaging container can be reduced, it can be put in a large number of trash cans and trash bags, which is useful for organizing trash. In that respect, the packaging container made up of two types of synthetic resin sheets can be divided into two types of synthetic resin sheets for the rigidity required at the time of use. It is important.

That is, when two types of synthetic resin sheets of different types are used as a container for packaging food, it is advantageous that the following points can be satisfied.
(1) Different functions or physical properties of the two synthetic resin sheets (2) No adhesive is used to integrate the two synthetic resin sheets (3) Two synthetic resins A conventional molding machine can be used to mold the sheet. (4) At least one of the two synthetic resin sheets has heat resistance. (5) The two synthetic resin sheets are made of a container. Make it easy to separate after use

  Therefore, the present inventors are suitable for packaging food, and can be produced as it is even with a conventional molding apparatus, and can be integrated with two synthetic resin sheets at the time of use. As a result of various studies on how to make a double container for packaging that can easily separate two synthetic resins, the present invention has been completed.

  That is, the object of the present invention is that the conventional manufacturing apparatus can be manufactured without any change and without using any adhesive, and the two sheets can be integrated and separated reliably. It is to provide a double container for packaging for food.

In order to solve the above problems, first, the means taken by the invention according to claim 1 will be described with reference numerals used in the description of the embodiments described later.
“A double-packaging container 10 having a bottom wall 11 and a side wall 12 that rises from the periphery of the inner layer 10a, which is a non-foamed layer, and an outer layer 10b, which is a foamed layer. ,
The side wall 12 is provided with an inclined surface 13 whose lower portion is inclined from the inside to the outside of the container, and the inclination angle θ of the inclined surface 13 is set to 15 to 80 degrees with respect to the perpendicular 11a to the bottom wall 11. To be
And the height H of the side wall 12 is 5 mm to 75 mm, and the packaging double container 10 ”
It is.

That is, as shown in FIGS. 1 and 4 to 6, the double container 10 for packaging according to the first aspect of the present invention is a double vacuum in which an inner layer 10 a that is a non-foamed layer and an outer layer 10 b that is a foamed layer are stacked. As shown in FIG.1 and FIG.2, it has the bottom wall 11 and the side wall 12 which stands | starts up from the periphery. As shown by the phantom lines in FIG. 6, the lid 20 is “internally fitted” to the packaging double container 10, and the packaging double container 10 and the entire lid 20 are completely packaged. A heavy container 10 may be used.

  This double container 10 for packaging, for example, when storing hot “fried chicken” with freshly fried food, can ensure “heat resistance” by making the inner layer 10a, which is a non-foamed layer, on the inside, so that the whole is heated. The outer layer 10b, which is a foamed layer, can ensure "heat retention" and take home the "fried chicken" that remains hot. .

  In particular, as for the physical properties of the inner layer 10a that is a non-foamed layer and the outer layer 10b that is a foamed layer constituting the packaging double container 10, if at least one of them has heat resistance, This is advantageous when used as a container. This double packaging container 10 may be used to store hot "fried chicken" or hang it in a microwave oven with the contents stored, and then heat the contents. In addition, when at least one of the inner layer 10a and the outer layer 10b has heat resistance, deformation of the packaging double container 10 accompanying heating can be prevented, and peeling or separation from the other of the inner layer 10a or the outer layer 10b can be prevented. Because.

  Moreover, in the double container 10 for packaging which concerns on this Claim 1, as shown to (b) of FIG.1 and FIG.2 in the side wall 12, the inclined surface 13 is formed. As shown in FIG. 2B, the inclined surface 13 has a lower portion inclined from the inner side to the outer side of the container. The inclined angle θ of the inclined surface 13 is, for example, as shown in FIG. As described above, the angle is 15 to 80 degrees with respect to the perpendicular 11a to the bottom wall 11. In other words, the inclined surface 13 is a so-called “undercut portion”.

  In this double container 10 for packaging, since the inclined surface 13 which is an undercut part exists, the inner layer 10a which is a non-foamed layer is the planar view of the left part of FIG. Alternatively, even when viewed from the bottom wall on the right side, it is in a state of being bitten into the outer layer 10b which is a foam layer. For example, the inner layer 10a and the outer layer 10b are locked to each other by setting the inclination angle θ of the inclined surface 13 to 15 degrees to 80 degrees even if the thermal shrinkage rates of the constituent materials are different. ing. As a result, the inner layer 10a is firmly integrated with the outer layer 10b at least on the inclined surface 13.

  The inclined surface 13 is formed by stacking an inner layer 10a and an outer layer 10b for constituting the packaging double container 10, and forming an “undercut portion” by forming a vacuum from both the upper and lower sides of the overlapping inner layer 10a and outer layer 10b. However, the inner layer 10a and the outer layer 10b can be integrated with each other because the inner layer 10a is a kind of “resistive portion” in the peeling direction from the outer layer 10b. Further, since the outer layer 10b, which is a foam layer, is not molded with compressed air, the bubbles are not crushed and become thin, so that "heat retention" can be ensured.

  In addition, since the inclined surface 13 is formed as an “undercut portion”, the double container 10 for packaging can be formed without changing the conventional sheet forming machine, and the inner layer 10a and the outer layer 10b can be formed. This eliminates the need to use an adhesive.

Further, as shown in FIG. 1, the inclined surface 13 may be formed over the entire circumference of the side wall 12. However, the inclined surface 13 is a portion that integrates the inner layer 10a and the outer layer 10b. Therefore, even if it is partially formed, for example, as long as it has a quadrangular shape as shown in FIG.

  The inclination angle θ of the inclined surface 13 with respect to the perpendicular 11a to the bottom wall 11 must be set to 15 to 80 degrees because the inclined surface 13 may cause damage during die cutting. This is because it does not have to be a “resisting portion”, and the inclined surface 13 must be a “resisting portion” against the peeling force of the inner layer 10a. That is, if the inclination angle θ of the inclined surface 13 is smaller than 15 degrees, the inclined surface 13 cannot be a sufficient “resisting portion” against the peeling force of the inner layer 10a, and the inclination angle θ is more than 80 degrees. If it is large, the inclined surface 13 becomes a large resistance part when the double packaging container 10 is die-cut, and its surroundings are damaged or die-cutting is difficult.

  And this double container 10 for packaging must make the height H of the side wall 12 shown to (a) of FIG. 2 into 5 mm-75 mm. The reason is that if the height H of the side wall 12 is lower than 5 mm, there is no storage space for storing food and the like, and a substantially inclined surface 13 cannot be formed. When the height H is greater than 75 mm, not only is it difficult to form such a deep double packaging container 10 by sheet molding, but the thickness of the inner layer 10a and the outer layer 10b around the inclined surface 13 is insufficient. This is because cracks are likely to occur.

  Of course, in the packaging double container 10 in which the inner layer 10a and the outer layer 10b are integrated on the inclined surface 13, the inner layer 10a can be relatively easily peeled off from the outer layer 10b after use. In addition to enabling each recycling, the inner layer 10a and the outer layer 10b are easily crushed to reduce the volume of the garbage.

  In addition, in the double container 10 for packaging of this embodiment, as shown to (a) of FIG.1 and FIG.3, the several bottom wall rib 14 is formed in the bottom wall 11. As shown in FIG. Each bottom wall rib 14 has its central ridge line bulged, for example, upward in the figure (inside the container), and is formed by an inner layer 10a and an outer layer 10b. In other words, each bottom wall rib 14 not only reinforces the rigidity of the entire packaging double container 10, but also prevents mutual displacement at the time of thermal contraction of the inner layer 10 a and the outer layer 10 b. Even a small amount plays.

  Therefore, the double packaging container 10 according to claim 1 can be manufactured without changing the conventional manufacturing apparatus and without using any adhesive, and the inner layer 10a and the outer layer 10b are integrated. In addition, the separation can be surely performed.

Moreover, in order to solve the said subject, the means which invention based on Claim 2 took about the double container 10 for packaging of the said Claim 1,
“The thickness of the inner layer 10a, which is a non-foamed layer, is 0.25 mm to 0.30 mm”
It is.

  In the double packaging container 10 according to claim 2, if the thickness of the inner layer 10a which is a non-foamed layer is set to 0.25 mm to 0.30 mm, the "sheet of the synthetic resin sheet constituting the inner layer 10a" It is possible not only to have sufficient rigidity necessary to store the contents, because the shape can be sufficiently maintained and higher rigidity different from the so-called “film” can be secured. Since the rigidity necessary for peeling off the outer layer 10b after use of the packaging double container 10 can be secured, peeling can be performed relatively easily.

  For this reason, the thickness of the inner layer 10a needs to be 0.25 mm to 0.30 mm. The reason is that if the thickness of the inner layer 10a is thinner than 0.25 mm, it is close to the above-mentioned “film”. This is because it is difficult to peel off from the outer layer 10b. On the other hand, when the thickness of the inner layer 10a is greater than 0.30 mm, not only is sheet formation difficult, but also the amount of dust is reduced after separation. This is because it becomes difficult to make a small group. That is, it becomes easy to recycle and reduce the garbage capacity after using the inner layer 10a.

  Accordingly, the double packaging container 10 according to the second aspect of the present invention exhibits the same function as that of the first aspect of the present invention, and in particular, the inner layer 10a is peeled off, and recycling or dust reduction is further facilitated. It is.

Furthermore, in order to solve the said subject, the means which the invention which concerns on Claim 3 took is about the double container 10 for packaging of the said Claim 1 or Claim 2,
“Having the lid 20 provided with the engaging portion 12a provided on the inner side of the upper portion of the side wall 12 and engaging with the engaging portion 12a”
It is.

  As shown in FIG. 6, the packaging double container 10 according to claim 3 is also provided with a lid 20, and the lid 20 is formed by the engaging portion 20a. By being engaged with the engaging portion 12a formed on the upper inner side of the side wall 12 on the 10 side, it is “internally fitted” to the double container 10 for packaging.

  Since the lid 20 covers the entire storage portion on the bottom wall 11 of the packaging double container 10 by being fitted inside the packaging double container 10, the inside of the packaging double container 10 The sealing property can be secured.

  Therefore, the packaging double container 10 according to the third aspect exhibits the same function as that of the first or second aspect, and can improve the hermeticity in the packaging double container 10 by the lid 20. It can be done.

As described above, in the present invention,
“A double-packaging container 10 having a bottom wall 11 and a side wall 12 that rises from the periphery of the inner layer 10a, which is a non-foamed layer, and an outer layer 10b, which is a foamed layer. ,
The side wall 12 is provided with an inclined surface 13 whose lower portion is inclined from the inside to the outside of the container. To be
And the height H of the side wall 12 is 5 mm to 75 mm ”
The main features of this structure are that it can be manufactured without changing the conventional manufacturing equipment and without using any adhesive, and the integration and separation of the two sheets are ensured. It is possible to provide a double packaging container 10 for food that can be used in a simple manner.

It is the top view which made the right half of the double container 10 for packaging which concerns on this invention the bottom wall figure. The double container 10 for packaging is shown, (a) is a front view, (b) is a longitudinal cross-sectional view in the 1-1 line | wire in FIG. The double container 10 for packaging is shown, (a) is a partially enlarged longitudinal sectional view taken along line 2-2 in FIG. 1, and (b) is a case where a plurality of the double containers 10 for packaging are stacked. It is a fragmentary sectional view. The double container 10 for the packaging is shown, and is a partially enlarged longitudinal sectional view taken along line 3-3 in FIG. The double container for packaging 10 is shown, and is a partially enlarged longitudinal sectional view when an inclined surface 13 is formed at a position different from that in FIG. 4. The double container 10 for packaging is shown, It is a partial expanded longitudinal cross-sectional view when the cover body 20 is fitted inside this.

  Next, the invention according to each claim configured as described above will be described together with the manufacturing method of the packaging double container 10 which is the embodiment shown in the drawings. A plan view of the double packaging container 10 according to the present invention is shown with the right half as a bottom wall view.

This double packaging container 10 is formed by stacking an inner layer 10a and an outer layer 10b heated to a temperature suitable for molding (softening temperature) by both vacuums, and inserting them into a molding machine using both vacuums conventionally used. Both the mold and the lower mold are formed by vacuum molding. The reason why the upper die and the lower die are both molded by vacuum is to prevent the outer layer 10b, which is a foamed layer, from being compressed by “pressure air” and crushed the internal minute space. The heater temperature on the inner layer 10a side was 440 ° C., and the heater temperature on the outer layer 10b side was 165 ° C. to 190 ° C.

The constituent material of the inner layer 10a is a sheet of polypropylene with filler (hereinafter simply referred to as PPF), which is a long original fabric having a thickness of 0.3 mm and a width of 1040 mm. The heater temperature for the inner layer 10a is 440 ° C., which is higher than 100 ° C. generated when the food inside is put together with the completed packaging double container 10 in a microwave oven. In addition, the heat shrinkage rate at the softening temperature at the time of molding by both vacuums of PPF was 11/1000.

On the other hand, the constituent material of the outer layer 10b is a sheet of polystyrene paper (hereinafter simply referred to as PSP) having a foaming ratio of 5 times, and is a long original fabric having a thickness of 1.2 mm and a width of 1040 mm. The heater temperature for the outer layer 10b is 165 ° C., which is higher than 100 ° C. generated when the food inside is put together with the completed packaging double container 10 in a microwave oven. In addition, the heat shrinkage rate at the softening temperature at the time of molding by both vacuums of this PSP was 5/1000.

  As shown in FIGS. 1 to 6, the packaging double container 10 molded with the above materials and molding conditions includes a bottom wall 11 and a side wall 12 rising from the periphery thereof. The side wall 12 is provided with an inclined surface 13 whose lower portion is inclined from the inside to the outside of the container.

In the case of the quadrangular packaging double container 10 shown in FIG. 1, the inclined surface 13 is continuously located on all four sides as shown by the dotted line in FIG. 1. The inner layer 10a and the outer layer 10b are integrated. Therefore, if the inner surface 10a and the outer layer 10b can be integrated, the inclined surface 13 does not need to be provided on the entire circumference of the packaging double container 10, for example, the packaging double container shown in FIG. 10 may be provided only on a pair of sides facing each other (only two sides facing each other), and in that case, may be provided so as to be provided on a part of each side.

  Further, the vertical position of the side wall 12 of the inclined surface 13 may be a location close to the upper edge flange of the packaging double container 10 as shown in FIG. Similarly, the location close to the bottom wall 11 of the packaging double container 10 may be used. That is, the formation position of the inclined surface 13 with respect to the side wall 12 is a portion that can be a resistance to the peeling direction of the inner layer 10a and the outer layer 10b (in FIG. 4 to FIG. It can be anywhere.

The inclined angle θ of the inclined surface 13 shown in, for example, FIG. 4 or 5 is 15 degrees with respect to the perpendicular 11a to the bottom wall 11. That is, the inclined surface 13 is inclined at an inclination angle θ of 15 degrees from the inside to the outside of the container, as shown in each of FIGS. The so-called “undercut portion” is constituted by the inclined surface 13 portion.

The fact that the inclined surface 13 that is the undercut portion is formed by the molding die by both upper and lower vacuums must allow the passage of the mold (die removal) at the inclined surface 13 portion when the mold is opened. Since the inclination angle θ is 15 degrees, the inner layer 10a and the outer layer 10b are not damaged at the time of die cutting, and the packaging double container 10 that has returned to the room temperature state is not deformed or wrinkled. Means that. For this reason, the inclination angle θ is allowed up to 80 degrees.

  Moreover, in the double container 10 for packaging of this Example, when it is a square whose one side is 220 mm, the height H of the side wall 12 was about 30 mm. And the width | variety of the up-down direction of the inclined surface 13 was 3.5 mm. By forming the inclined surface 13 as described above, when the plural packaging double containers 10 are stacked, as shown in FIG. 3B, the inclined surface 13 itself also serves as an anti-blocking portion. It is.

  Further, as shown in FIG. 6, the packaging double container 10 is provided with an engaging portion 12a inside the upper portion of the side wall 12, and the engaging portion 12a is provided with an engaging portion 20a of the lid 20. Can be engaged, that is, internally fitted, and also provided with the lid 20.

  Of course, the lid 20 covers the entire storage portion on the bottom wall 11 of the packaging double container 10 by being fitted inside the packaging double container 10, so that the packaging double container 10 can be secured.

DESCRIPTION OF SYMBOLS 10 Double packaging container 10a Inner layer 10b Outer layer 11 Bottom wall 11a Vertical line 12 Side wall 12a Engagement part 13 Inclined surface 14 Bottom wall rib 20 Lid 20a Engagement part H Height (theta) Inclination angle

Claims (3)

A double container for packaging having a bottom wall and a side wall rising from its peripheral edge, which is formed by both vacuums by overlapping an inner layer that is a non-foamed layer and an outer layer that is a foamed layer,
The side wall is provided with an inclined surface in which the lower portion is inclined from the inside to the outside of the container, and the inclination angle θ of the inclined surface is set to 15 to 80 degrees with respect to the perpendicular to the bottom wall. ,
And the double container for packaging characterized by the height H of the said side wall having been 5 mm-75 mm.   The double container for packaging according to claim 1, wherein the inner layer which is the non-foamed layer has a thickness of 0.25 mm to 0.30 mm.   3. The double packaging according to claim 1, further comprising: a lid provided with an engagement portion provided on an upper inner side of the side wall, the engagement portion engaging with the engagement portion. container.

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