WO2019039444A1

WO2019039444A1 - Packaging container

Info

Publication number: WO2019039444A1
Application number: PCT/JP2018/030728
Authority: WO
Inventors: 栄治北原
Original assignee: 日清食品ホールディングス株式会社
Priority date: 2017-08-23
Filing date: 2018-08-21
Publication date: 2019-02-28

Abstract

[Problem] To provide a packaging container such that a lid member when being torn off is prevented from being torn off from the container body beyond an intended tearing range. [Solution] A packaging container 1 comprising a PSP container body 10 having an open part 11 disposed on an upper side of a storage section and a flange part 14 extending outward from the open part 11 and a lid member 20 for sealing the storage section by being thermally bonded over the entire area of the flange part 14, wherein the flange part 14 and the lid member 20 of the packaging container 1 are thermally bonded together under different conditions depending on the region.

Description

Packaging container

The present invention relates to a packaging container made of thermoplastic resin. More particularly, the present invention relates to a packaging container which is thermally bonded under different conditions depending on regions when the lid material and the container body made of a thermoplastic resin are thermally bonded.

Currently, a wide variety of products containing food in packaging containers are distributed in the market. An example is instant food, and further, instant food includes instant noodles in a container. Containerized instant noodles are extremely simple food products that can be eaten simply by pouring a specified amount of hot water into the container and leaving it for several minutes after opening the lid of the sealed container.

By the way, the lid material of the container plays an important role when hot water is returned to the instant noodles. If the lid material of the container is completely peeled off, the hot water tends to cool, and the amount of heat necessary for returning the hot water may be insufficient. Then, a resealing means is proposed as a means for resealing a lid material after opening and securing the amount of heat required for hot-water return (refer to patent documents 1).

The resealing means described in Patent Document 1 has a configuration in which a cut piece formed by a cut line is provided substantially at the center of the grip piece, and the tip of the cut piece is locked to a part of the lower surface of the flange portion It has become.

JP 2001-48220 A

However, the resealing means of Patent Document 1 does not control the opening range of the lid. Therefore, if the lid material is opened beyond the planned opening range, there is a problem that, even if resealing, a gap is formed between the container body and the lid material and heat is easily released. . In addition, in the case of instant noodles with a container that can be drained and eaten after returning to the open water, hot water leaks from a location that would not otherwise leak out when draining if it is opened beyond the planned opening range. There is also a risk of getting it out. As described above, when the lid material is opened, it is required to prevent the lid from being opened beyond the intended opening range, but satisfactory products have not been obtained yet.

The present invention has been made in view of the above problems. That is, an object of the present invention is to provide a packaging container in which the container body is prevented from being opened beyond the planned opening region when the lid member is opened.

The present invention for solving the above problems is a container main body made of thermoplastic resin having an opening on the top surface of the housing and having a flange extending outward from the opening, and the entire area of the flange It is a packaging container which consists of a lid which seals the above-mentioned storage section by being heat-bonded, and is a packaging container in which the flange and the lid are heat-bonded under different conditions by a field.

According to such a configuration, the adhesive strength can be changed depending on the area since the heat bonding is performed under different conditions. As a result, since the planned opening area can be recognized by the difference in adhesive strength, it is possible to prevent the lid material from being opened from the container body beyond the planned opening area.

The present invention for solving the above problems is a container main body made of thermoplastic resin having an opening on the top surface of the housing and having a flange extending outward from the opening, and the entire area of the flange A packaging container comprising a lid material for sealing the containing portion by being thermally bonded, wherein the flange portion and the lid material are thermally bonded under different conditions depending on the region, and peeling force between the regions is It is a packaging container whose difference is 1.8 N or more.

According to such a configuration, since there is a difference in peel force between the regions, the expected opening range can be recognized. Thereby, it is possible to prevent the lid material from being opened from the container body beyond the planned opening range.

According to the present invention, when the lid material is opened, the container body is not opened beyond the planned opening range. Thereby, the amount of heat necessary for the hot water return can be secured. In addition, when the hot water is drained, it is possible to prevent burns and the like due to hot water leakage from unintended locations.

It is sectional drawing of the packaging container concerning this invention. It is an enlarged view of the flange part of the container main body concerning this invention. It is an explanatory view for explaining the heat adhesion state of a flange part of a container main part concerning the present invention, and a lid, and (a) shows a weak adhesion state and (b) is an explanatory view showing a strong adhesion state. is there. It is explanatory drawing for demonstrating the heat-adhesion state of the flange part and lid | cover material of PSP container main bodies concerning 1st embodiment. It is explanatory drawing for demonstrating the heat-adhesion state of the flange part and lid | cover material of PSP container main bodies concerning 2nd embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the same referential mark may be attached | subjected to the element which is the same or it corresponds through the following all the drawings, and the overlapping description may be abbreviate | omitted.

FIG. 1 is a cross-sectional view of the packaging container 1 in the present invention. The packaging container 1 concerning this invention is comprised by the container main body 10 which consists of thermoplastic resins, and the cover material 20. As shown in FIG. Furthermore, the container body 10 according to the present invention has the opening 11 at the upper side, and further has the bottom surface 12 and the side surface 13. Moreover, the container main body 10 concerning this invention has the flange part 14 extended outside from the opening part 11. As shown in FIG.

As a thermoplastic resin used for the container main body 10, polyester resin, polyolefin resin, polystyrene resin, polyamide resin, polycarbonate resin, polyacrylonitrile resin, polyimide resin, polyvinyl chloride resin, polyvinylidene chloride resin, polyvinyl alcohol resin, ethylene vinyl Alcohol resin and polyurethane resin are mentioned. The thermoplastic resin layer may be a single layer or a laminate.

As a method of forming the thermoplastic resin container according to the present invention, a conventional forming method such as vacuum compression foam molding, injection molding, pressure forming, hot plate molding and the like can be used. Among these, vacuum compression foam molding is preferable.

In the present invention, the container body 10 is preferably foam-molded. In the case of foam molding, a foaming agent can be added to the thermoplastic resin. Examples of the foaming agent include known foaming agents, for example, hydrocarbons such as propane, normal butane, isobutane, normal pentane, isopentane, neopentane, cyclopentane, cyclopentadiene, hexane and the like, ketones such as acetone and methyl ethyl ketone, methanol And ethanol, alcohols such as isopropyl alcohol, dimethyl ether, diethyl ether, dipropyl ether, methyl ethyl ether, ether compounds such as petroleum ether, carbon dioxide, nitrogen, ammonia, water and the like. In addition, as the foaming agent, a degradable foaming agent such as a mixture of sodium hydrogencarbonate or an organic acid such as azodicarbonamide, dinitrosopentamethylenetetramine, sodium hydrogencarbonate, citric acid or a salt thereof may be used. .
These foaming agents may be used alone or in combination of two or more.

Next, the shape of the flange portion 14 of the container body 10 will be described with reference to FIG. The flange portion 14 according to the present invention is provided integrally with the container body 10. Moreover, the upper surface and lower surface of the flange part 14 concerning this invention become a respectively different shape. A convex portion 142 is formed on the upper surface of the flange portion 14 so as to draw an arc upward from the flat surface 141 toward the container side surface portion 13 from the outer peripheral edge. On the other hand, the lower surface of the flange portion 14 is provided with a recessed portion 144 which is recessed upward from the flat surface 143 from the outer peripheral edge toward the container side surface portion 13. The recess 144 is preferably provided closer to the side surface portion 13 than the protrusion 142. The shape of the recess 144 is not particularly limited, but is preferably rectangular.

The thickness H of the flange portion 14 is preferably 2 to 5 mm. Here, the thickness H of the flange portion 14 means the length of a vertical line drawn from O to a horizontal line passing the apex P, where O is the apex of the convex portion 142 and P is the apex of the upper surface of the depression 144. . If the thickness H is less than 2 mm, there is no durability, which is not preferable.

The width W of the flange portion 14 is preferably 6 to 10 mm. Here, the width of the flange portion 14 can be determined as follows. A point at which a tangent line A drawn perpendicularly to the horizontal surface so as to contact the outer peripheral edge of the flange portion 14 and a tangent line B drawn parallel to the horizontal direction so as to contact the vertex O of the convex part 142 intersect Let's say Q. Next, the shortest distance between the points Q and R is the width W of the flange portion 14 where R is a point where the extension line C of the side surface portion 13 of the container body 10 intersects the tangent B. If the width W is less than 6 mm, sufficient adhesion with the lid member 20 can not be obtained, which is not preferable.

By providing the recessed portion 144 in the flange portion 14, durability can be provided so as not to be damaged when the container is deformed. Even when the recess portion 144 is provided in the flange portion 14, the container is easily damaged if the thickness H of the flange portion 14 is thin. Therefore, it is important to consider the balance between the recess portion 144 and the thickness H.

The configuration of the lid 20 is not particularly limited, and may be a single layer or a multilayer structure. In the case of a multilayer structure, it may be configured according to the adhesive strength with the thermoplastic resin used for the container body 10. One example is the configuration of the sealant layer / aluminum / polyethylene layer / printed layer from the inside of the container.

The adhesion mechanism between the lid 20 and the container body 10 can be determined based on the peeling mechanism when peeling the lid 20 from the container body 10. Peeling mechanisms can be roughly classified into cohesive peeling, interfacial peeling and delamination. The size of the particles to be blended and the type of blending material may be changed. Among them, the cohesive peeling mechanism is designed by blending a thermoplastic resin with an incompatible or partially compatible thermoplastic resin. As the peeling principle in the cohesive peeling mechanism, the fact that the cohesive force of the incompatible or partially compatible thermoplastic resin blend layer is small is utilized, and at the time of opening, it is not the interface between the innermost sealant of the lid and the flange portion. Use of cohesive failure of a compatible or partially compatible thermoplastic resin blend layer may be mentioned.

As the material of the non-compatible or partially-compatible thermoplastic resin, EVA-based materials in which a wax and a caking agent are blended, and non-compatible polymer alloys such as polyolefin / polystyrene and polyethylene / polypropylene are known. It is characterized by excellent sealing temperature stability of peel strength, foreign matter sealing property, and content resistance.

Next, a method of thermally bonding the container body 10 and the lid member 20 will be described.
When the container body 10 is fitted, the flange portion 14 is placed in a hole-shaped mold so as to be hooked, and the lid 20 is placed on the opening 11. Of the heat bonding (hereinafter sometimes referred to as "seal") conditions, the heat sealer thermally bonds the entire periphery of the flange portion 14 based on the weak adhesion (hereinafter sometimes referred to as "primary seal") conditions. Do. At this time, as a weak bonding condition, the pressure is about 100 to 110 ° C. and 0.1 MPa. Thereby, the lid 20 can be prevented from being displaced from the opening 11, and sealing performance can be provided.

Subsequently, heat bonding is performed by a heat sealer having a shape matched to a position to be bonded under strong bonding (hereinafter sometimes referred to as “secondary seal”) conditions. The strong bonding conditions are 120 to 145 ° C. and a pressure of 0.3 MPa or more. In addition, although the case where two heat sealers were used was demonstrated and demonstrated here, you may carry out only by one heat sealer. For example, the purpose can be achieved by forming the heat sealer into a stepped structure which is notched according to the desired adhesive strength. In addition, if only one heat sealer with strong bonding conditions is used, a member to which heat is not easily applied is placed on the lid 20 at a location corresponding to the weak bonding conditions, and the temperature is adjusted to perform heat bonding. May be In the case of using two heat sealers, it is preferable to perform secondary sealing after placing a separate member for preventing heat from being applied to a portion corresponding to weak bonding conditions after primary sealing.

Describing the bonding method in more detail, the base is provided with a recess for fitting the container body 10 and a positioning member for determining the positions of the container body 10 and the lid member 20. The recess has the same shape as the shape of the container body 10 and is formed slightly larger than the container body 10.

First, the container body 10 is supplied from the container body supply device to the pedestal according to the shape of the recess with the opening 11 facing upward. Here, since the recess is slightly larger than the container body 10, the container body 10 fits into the recess, and the flange portion 14 of the container body 10 abuts the surface around the recess of the pedestal. Thus, the container body 10 is supported by the pedestal. In addition, when the container main body 10 is inserted in a hollow, the position of the container main body 10 is finely adjusted by the positioning member.

Next, food is filled from the food filling apparatus into the container body 10 installed on the pedestal. Next, the lid 20 is supplied from the lid supply device. Positional displacement between the supplied lid member 20 and the container body 10 is adjusted by the positioning member. Thereby, a predetermined space can be formed in the packaging container. Thereafter, the seal head descends from above, and pressure and temperature are applied from above the lid member 20 to perform primary sealing. An example of pressure and heat at this time is 0.1 MPa and 105 ° C. As a result, the lid member 20 and the flange portions 14 of the container main body 10 are bonded to each other to form a weakly bonded portion.

Here, as shown in FIG. 3A, in the weakly bonded portion, only the convex portion 142 of the flange portion 14 is crushed by pressure and bonded to the lid member 20. On the other hand, the flat surface 141 on the upper surface of the flange portion 14 is not bonded. This narrows the seal width and lowers the peel strength. On the other hand, a gap is formed between the lid 20 and the flat surface 141.

Next, a separate member with low thermal conductivity is installed at the place where strong adhesion is not performed. Polyether ether ketone is mentioned as another member. In addition, a member with high thermal conductivity is installed in the portion to be strongly bonded. Aluminum is one example of a member having a high thermal conductivity. Preferably, the member having high thermal conductivity and the member having low thermal conductivity are integrated in advance. Thereby, since the thickness of members can be made the same, application of the pressure to the container main body 10 can be made uniform.

Thereafter, the seal head descends from above, and pressure and temperature are applied from above the lid member 20 to perform secondary sealing. An example of pressure and heat at this time is 0.3 MPa and 120 ° C. Thereby, a strong adhesion part is formed

Here, as shown in FIG. 3B, the strong bonding portion bonds not only the convex portion 142 of the flange portion 14 but also the lid member 20 to the flat surface 141 on the flange portion 14 upper side. As a result, the lid 20 is bonded more firmly than the weak bonding portion. Note that pressure is an important factor in order to bond with the lid member 20 in a wider range.

Finally, the packaging container 1 to which the lid 20 and the flange portion 14 are thermally bonded is taken out of the manufacturing apparatus.

Hereinafter, the present invention will be described in more detail based on examples. Moreover, each characteristic of this invention was evaluated by the following methods.

(On the effect of the flange shape)
In order to prevent the container body from being opened beyond the planned opening range, the difference in peeling force is important. In other words, the difference in adhesion between the bonded parts is important. Here, the difference in adhesion due to the difference in the shape of the flange portion was examined.

Example 1
A commercially available PSP sheet was vacuum molded to produce a container body having a width W of 6 mm at the flange and a height H at 3 mm on the flange. Moreover, the lid material which consists of a sealant layer / aluminum layer / polyethylene layer / printing layer was prepared from the inside.
Next, as described above, the container main body was placed on the pedestal for heat bonding, and the lid was placed according to the end of the flange portion. And primary sealing was performed for 1 second on conditions of 0.1MPa and 105 ° C. Next, using a covering member made of a resin material having low thermal conductivity on the lower half side (side provided with the grip for opening) of the lid, which is an opening, and a metal member having high thermal conductivity on the upper half side. From the top of the covering member, secondary sealing was performed for 1 second under the conditions of 0.3 MPa and 120 ° C., and the packaging container according to Example 1 was obtained.

Comparative Example 1
The container body is the same as the container body of the first embodiment except that the flange portion is flat and extends in the horizontal direction. In addition, the width | variety of the flange part of the comparative example 1 is 6 mm, and the thickness of a flange part is 3 mm.
The same lid as in Example 1 was used and sealing was performed under the same conditions as in Example 1.

<Measurement of peel strength (peel force)>
The peel strength at the time of peeling the lids of Example 1 and Comparative Example 1 from the container body was measured. The measurement of peel strength (peel force) was performed using a tensile tester (product name “RTC-1310A” manufactured by ORIENTEC Co., Ltd.). After primary sealing and secondary sealing of the container body and the lid member, the grip portion was sandwiched with an air jaw, and the air jaw was pulled vertically at a speed of 300 mm / min, and the resistance at that time was taken as the peel strength.

The results are shown in Table 1

As apparent from Table 1, the difference in peel force was larger in Example 1 than in Comparative Example 1. On the other hand, in Comparative Example 1, it was difficult to feel the difference between the peel strength of the primary seal area and the peel strength of the secondary seal area. The reason is considered as follows. Adhesion is an important factor of temperature, pressure and time, and the area of the flange to be adhered further determines the final adhesion. The stronger the adhesion, the stronger the peel strength. In Comparative Example 1, flat flanges are provided around the opening with the same width, and the bonding area between the lid and the flange is always the same regardless of the bonding area. When the lid of Comparative Example 1 is peeled off from the grip portion, the contact unit area at the peeling point between the lid and the flange is wide at first, gradually decreasing until the opening area of the opening reaches half, and thereafter the lid is peeled off It will increase gradually. In such a case, the difference between the weak bonding area and the strong bonding area ultimately depends on the temperature and the pressure because the flanges have the same width.
On the other hand, in Example 1, the contact width between the lid and the flange portion differs depending on the bonding area. Also, the temperature and pressure vary depending on the bonding area. Therefore, the difference between the weak adhesion area and the strong adhesion area is related to the flange width, the temperature and the pressure, and it is considered that the difference in the peeling force is felt larger than in Comparative Example 1. In addition, since the width of the flange portion bonded to the lid member in the weak bonding region is narrower than that in Comparative Example 1, the peeling force may be smaller than that in Comparative Example 1 as a whole. And, after peeling with a small peeling force, when it strikes in the area of strong adhesion, it is thought that it feels more resistively than it actually is.

Next, it verified about the difference in the effect by heat bonding conditions.

[Example 2, Comparative Example 2]
The same as Example 1 and Comparative Example 1 except that the primary heat adhesion was changed to 0.2 MPa.

[Example 3, Comparative Example 3]
The same as Example 1 and Comparative Example 1 except that the primary heat adhesion was changed to 120 ° C.

[Example 4, Comparative Example 4]
The same as Example 1 and Comparative Example 1 except that the secondary heat adhesion was changed to 135 ° C.

[Example 5, Comparative Example 5]
The same as Example 1 and Comparative Example 1 except that the secondary heat bonding was changed to 0.4 MPa and 135 ° C.

The results are shown in Tables 2 and 3.

In Examples 2 and 3, the condition of the primary seal is changed. When Example 1 is compared with Examples 2 and 3, it can be seen that the peel strength of the primary seal and the seal width of the primary seal are increased. On the other hand, when Example 2 and Example 3 are compared, it can be seen that the peel strength and the seal width hardly change even if the temperature or pressure of the primary seal is changed. In addition, it can be seen that the seal width is increased although the pressure is slightly increased. In addition, no change was observed in the peel strength of the secondary seal portion and the seal width of the secondary seal portion.
Examples 4 and 5 change the conditions of the secondary seal. When Example 1 was compared with Examples 4 and 5, no change was observed in the peel strength of the primary seal and the seal width of the primary seal. On the other hand, it can be seen that the peel strength of the secondary seal and the seal width of the secondary seal are increased. Furthermore, when Example 4 and Example 5 are compared, in spite of the stronger seal condition of Example 5, the result was hardly changed. This is considered to be because, since the lid member and the flange portion are sufficiently adhered under the sealing condition of the fourth embodiment, the sealing state does not change even if the sealing condition is further changed.

On the other hand, in Comparative Examples 2 and 3, almost the same results as Comparative Example 1 were obtained. This is considered to be because, since the flange portion is flat, the lid member and the flange portion are sufficiently bonded under the conditions of Comparative Example 1 and no change occurs in the sealing state even if the sealing conditions are changed. That is, it is suggested that there is no difference in the effect of the primary seal on sealing under a further sealing condition.
It can be seen from Comparative Examples 4 and 5 that the peel force of the secondary seal portion is increased more than that of Comparative Example 1. Although the peel strength difference appears in comparison with Comparative Example 1, it was still not sufficient to control the opening range.

(On the effect of the flange width)

Then, it verified about the width of the flange which adheres to a lid material. The width of the flange portion needs to have the same effect as ensuring the sealing property and the easy opening property. Also, it is necessary to make a clear difference in the peel force difference between the primary seal area and the secondary seal area.

[Examples 6 to 10]
This embodiment is the same as Embodiments 1 to 5 except that the width of the flange portion is changed to 8 mm.

The results are shown in 4.

In Examples 6 to 10, it is understood that the seal width of the secondary seal portion is increased by extending the length of the flange portion by 2 mm. In addition, the peel force difference is also increased by the increase of the seal width, and the peel force difference of at least 2N or more is increased as compared with Examples 1 to 5. From this result, it can be understood that changing the length of the flange portion is one means to prevent the opening beyond the opening range.
In addition, even when compared with Comparative Examples 1 to 5, it can be seen that the peel force difference increases by at least 3N or more. Thereby, it is possible to prevent the opening beyond the opening range.

From the above results, in the present invention, the primary seal area is preferably 3 mm or more. If it is less than 1 mm, the peel force may be small, but adhesion failure is likely to occur, and the lid may be easily peeled off when an unexpected external force is applied during transportation or store display. . Therefore, 3 mm or more which is difficult to separate even if unexpected external force is applied is preferable. On the other hand, if the difference from the secondary seal area is less than 1.5 mm, it becomes difficult to obtain the peel force difference.

On the other hand, the secondary seal area is preferably 7 mm or more and 15 mm or less. If the difference from the primary seal area is less than 1.5 mm, it becomes difficult to obtain the difference in peel force from the primary seal adhesion area. On the other hand, when it becomes larger than 15 mm, while it becomes difficult to peel off and it becomes easy to destroy the flange equivalent part of a lid material at the time of peeling, it is unpreferable.

The peel force difference between the primary seal area and the secondary seal area is preferably at least 1.8 N or more, more preferably 2.0 N or more, and even more preferably 4.0 N or more. If it is 1.8 N or more, it is possible to prevent the container body from being opened beyond the scheduled opening range, because a clear peel force difference is felt. On the other hand, if it is less than 1.8 N, it is difficult to feel a difference in peel force at the time of peeling, so there is a possibility that the container body may be accidentally opened from the container body beyond the scheduled opening. In the above embodiment, a combination having a peel force difference of 2.0 N or more may be selected within the range of 3 to 4 mm in the primary seal area and 6 to 8 mm in the secondary seal area.

Although the container which employ | adopted two types of adhesion | attachment area | regions was demonstrated to the example as shown in FIG. 4 in the said Example, as shown in FIG. 5, you may provide three adhesion | attachment area | regions. By providing three bonding areas, for example, the opening can be once stopped when pouring water, and the lid material can be easily peeled off when the lid material is completely peeled off at the time of eating.

As described above, according to the present invention, the flange portion and the lid member are thermally bonded under different conditions depending on the region. And by being heat-bonded under different conditions, since a difference can be provided in exfoliation power, when opening a lid, it can prevent opening from a main part of a container exceeding an opening expected range.

DESCRIPTION OF SYMBOLS 1 Packaging container 10 Container main body 11 Opening part 12 Bottom part 13 Side part 14 Flange part 141 Flat surface 142 flange part upper surface 142 Convex part 143 Flange part lower flat surface 144 Recess 20 Lid material H Flange part height W of flange part width

Claims

A container main body made of thermoplastic resin having an opening on the top surface of the housing and having a flange extending outward from the opening, and the housing being heat-bonded across the entire area of the flange And a lid for sealing the package.
The packaging container in which the said flange part and the said lid material are heat-bonded on different conditions by area | region.
A container main body made of thermoplastic resin having an opening on the top surface of the housing and having a flange extending outward from the opening, and the housing being heat-bonded across the entire area of the flange And a lid for sealing the package.
The flange and the lid are thermally bonded under different conditions depending on the area,
The packaging container whose difference in the peeling force between area | regions is 1.8 N or more.