JP4533975B2 - Cup container with excellent releasability - Google Patents

Description

  The present invention relates to a cup container for containing a tofu or a semi-solid or pasty container such as coffee jelly or pudding and a method for producing the cup container. More specifically, the present invention relates to a cup container in which the releasability between the inner surface and the contained material is increased by aging the cup container in which an antistatic agent is kneaded, and a method for producing the same.

  As this type of cup container, a pudding container as disclosed in Patent Document 1 is known. This pudding container has a bottom surface and a peripheral wall surface on the bottom side for containing the carmela sauce in an uneven rough surface in a plastic molded container body containing the carmela sauce on the bottom and the pudding on the bottom. A protrusion or protrusion is provided around the upper inner wall surface. In addition, the pudding container is usually formed by injection molding using a mold, and the uneven shape of the rough surface is also formed by the uneven shape provided in the mold.

  The pudding container disclosed in Patent Document 1 contains a caramel sauce on the bottom and a pudding layered on the pudding container. In such a state, the pudding container is vibrated by vibration or the like. Even when the distorted, the separation between the pudding and the inner wall surface of the container main body can be prevented. Further, the caramel sauce is prevented from penetrating and rising along the inner wall surface of the pudding container.

  However, in the pudding container of Patent Document 1, the contact surface area between the inner wall surface and the pudding is slightly increased by forming a rough rough surface on the inner wall surface of the container body. . And by this slight increase in the contact area, only a slight increase effect of physical adhesion force is exerted on the contact surface between the inner wall surface and the pudding. For this reason, when a large vibration or impact is applied during transportation, the pudding and the inner wall surface are easily separated from each other, and there is a high possibility that the caramel sauce penetrates and rises along the inner wall surface of the pudding container. .

  On the other hand, in the pudding container of Patent Document 1, a special mold having an uneven shape is necessary in order to form a rough uneven shape. This mold is formed with minute irregularities to form a rough surface, and it takes a lot of labor to manufacture, so the manufacturing cost of the pudding container has been remarkably increased.

Therefore, the applicant pays attention to the problems existing in the technique of the above-mentioned Patent Document 1 and, as in Patent Document 2, by ionizing the wall surface of the container, the adhesive force on the contact surface of the water-soluble container In addition, the present invention provides a cup container capable of efficiently increasing the antistatic effect and a cup container manufacturing method capable of easily manufacturing the cup container.
Japanese Patent Laid-Open No. 6-32391, abstract, representative diagram Japanese Patent Laid-Open No. 2001-130529, abstract, representative diagram

  According to the invention of Patent Document 2, it is true that “by ionizing the wall surface of the container, it is possible to increase the adhesive force on the contact surface of the water-soluble contents and to effectively exhibit the antistatic effect. In other words, there has been a demand for a cup container which is not good for "increasing the adhesive force on the contact surface of the water-soluble contents".

  For example, when “tofu” is considered as a container, the tofu must be taken out of the container in a state where it is not deformed as much as possible. That is, as a cup container for tofu, it is necessary to make the mold release property with respect to the inner surface of the tofu good. By doing so, the tofu can be easily taken out and does not remain attached to the container, so that the tofu can be prevented from being deformed and the amount of tofu discarded together with the container can be reduced.

  Therefore, the present inventors have made various studies on how to make a cup container that can easily remove a semi-solid container such as tofu and prevent the collapse of the container. As a result, semi-solid inclusions such as tofu are produced using “water”, and the surface of the semi-solid contents is abundant and the present invention has been completed.

  That is, an object of the present invention is to provide a cup container that can easily remove a semi-solid container such as tofu and can prevent the collapse of the container at the time of removal. .

In order to solve the above problems, the means taken by the invention according to claim 1 will be described with reference numerals used in the description of the best mode described below.
"Least be formed of antistatic agent 11 nonionic cup shape by synthetic resin having free 0.2% to 0.3%, Ca-up for accommodating the semi-solid or pasty contained object A container 10,
The cup container 10 having excellent releasability, characterized in that the antistatic agent 11 is bleed out on the surface of the cup container 10 by aging the cup container 10 ".
It is.

That is, the cup container 10 according to the present invention is formed in a cup shape with a synthetic resin as shown in FIG. 1, and as this synthetic resin, a resin containing an antistatic agent 11 is adopted. is doing. This antistatic agent 11 needs to be contained in a synthetic resin in an amount of 0.3% or less. The reason for this is not only that the necessary antistatic effect is not improved even if it is more than that. The antistatic agent 11 that has appeared on the surface fouls the mold and prevents the next molding from being performed satisfactorily, and further causes “whitening” of the cup container 10, which adversely affects the molding of the cup container 10. is there. Among them, the content of the antistatic agent 11 in the synthetic resin needs to be 0.2% to 0.3% .

  As the antistatic agent 11, a nonionic (nonionic) surfactant is used, and this antistatic agent 11 does not ionize as ions even when dissolved in water. That is, the antistatic agent 11 used in the present invention is widely used in foods, cosmetics, spermicides, and the like in addition to detergents, and mainly contains glycerin fatty acid ester and diethanolamine. It is.

  Then, after the cup container 10 is integrally formed with a synthetic resin containing the antistatic agent 11, the cup container 10 is subjected to an aging treatment so that a part of the antistatic agent 11 is, as shown in FIG. Bleed out (deposited) on the surface of the film.

  Next, the operation of the cup container 10 configured as described above will be described. Now, as shown in FIG. 1, the non-ionized antistatic agent 11 is uniformly bleed out on the inner and outer surfaces of the cup container 10. Since the antistatic agent 11 has a good electrochemical affinity with “water” leached on the surface side of the container such as tofu, the antistatic agent 11 is particularly suitable for the cup container 10. By bleeding out on the inner surface, the separation or separation action between the cup container 10 and the contents is improved.

  On the other hand, in the cup container 10, the antistatic agent 11 is kneaded inside, and the non-ionized antistatic agent 11 bleeds out to the surface (outer peripheral surface) of the peripheral wall 13 and the bottom wall 12. Therefore, the generation of static electricity is effectively prevented, and the adhesion to the surface of dust or dust is suppressed. That is, the antistatic agent 11 present on the surface of the peripheral wall 13 contributes to improving the antistatic performance of the peripheral wall 13 to which dust and dust are most likely to adhere, and maintaining a hygienic state at all times. . Furthermore, the antistatic agent 11 is kneaded into the cup container 10 inside the bottom wall 12 and the peripheral wall 13, so that the antistatic agent 11 is not easily peeled and lost, and the antistatic effect is maintained over a long period of time. To demonstrate.

  By the way, in the conventional cup container, since the antistatic agent was only kneaded into the synthetic resin for molding the cup container, the extremely small amount existing on the surface greatly contributes to the antistatic performance. The antistatic agent present in the interior was not very important. In particular, in a disposable cup container that is used only once, most of the antistatic agent kneaded in the interior has been wasted. In contrast, the cup container 10 of the present invention can exhibit a necessary and sufficient antistatic performance and can easily reduce the amount of the antistatic agent 11.

  Conventionally, there is also known a cup container that has been subjected to temporary antistatic treatment by pre-injecting a cup container with a synthetic resin material that does not contain an antistatic agent and then applying an antistatic agent to the surface of the container. It has been. The cup container is configured so that the antistatic performance on the surface of the cup container can be locally enhanced by the antistatic agent applied to the surface of the cup container. However, this cup container is manufactured through an extra process of applying an antistatic agent after injection molding, which increases the manufacturing cost and prevents the antistatic applied to the surface by friction, water washing, etc. There was a drawback that the agent was easily peeled off and lost.

  On the other hand, the cup container 10 of the present invention can be manufactured without the need for the extra steps. Furthermore, since the antistatic agent 11 present on the surface of the peripheral wall 13 is firmly bonded to the surface of the peripheral wall 13 and the antistatic agent 11 that has not been bleeded out remains in the peripheral wall 13, The antistatic agent 11 is not easily lost, and the antistatic performance can be maintained high over a long period of time.

  Therefore, the cup container 10 according to the first aspect can easily take out a semi-solid container such as tofu, and can prevent the container from being deformed at the time of removal.

In order to solve the above problems, the means taken by the invention according to claim 2 is the cup container 10 according to claim 1,
“The aging treatment conditions are a temperature of 55 ° C. to 65 ° C. and a time of 20 hours to 30 hours”.

  That is, in the cup container 10 according to the second aspect, the temperature condition of the aging treatment is 55 ° C. to 65 ° C., and the time condition is 20 hours to 30 hours.

  The reason why the temperature condition of the aging treatment is set to 55 ° C. to 65 ° C. is that when the aging treatment is performed at a temperature higher than this range, the molded cup container 10 is deformed and is lower than this range. This is because sufficient bleed out cannot be obtained even if aging treatment is performed at a temperature.

  Moreover, the time condition of the aging treatment is set to 20 hours to 30 hours. If the time condition is larger than this range, the bleedout amount of the antistatic agent 11 does not increase so much, and the bleedout amount of the antistatic agent 11 is increased. This is because it becomes more than necessary, and if it is smaller than this range, sufficient bleed out of the antistatic agent 11 cannot be expected.

  The cup container 10 according to claim 2 configured as described above has a bleed-out of the antistatic agent 11 for facilitating the removal of a semi-solid container such as tofu on the surface thereof. It is necessary and sufficient.

  Therefore, the cup container 10 according to the second aspect has the minimum necessary bleed-out of the antistatic agent 11 and can easily take out the tofu and prevent the shape of the contents from being lost during the take-out. can do.

In order to solve the above problems, the means taken by the invention according to claim 3 is:
"It is formed at least a nonionic antistatic agent in a cup shape by a synthetic resin containing 0.2% to 0.3%, to produce a Ca-up vessel 10 containing a semi-solid or pasty contained object A method,
After the cup container 10 was integrally formed with a synthetic resin containing at least an antistatic agent 11, the cup container 10 was aged to cause the antistatic agent 11 to bleed out on the surface of the cup container 10. Manufacturing method of cup container characterized by that "
It is.

  That is, the invention according to claim 3 relates to a method of manufacturing the cup container 10 according to claim 1, wherein the cup container 10 is at least antistatic agent 11 (less than 0.3% in the best mode). The cup container 10 is subjected to an aging treatment after being integrally formed with a synthetic resin containing slag.

  Thereby, the cup container 10 of Claim 1 can be easily manufactured using the existing equipment as it is.

Further, the means taken by the invention according to claim 4 relates to the manufacturing method of claim 3 above.
“Aging treatment condition is a temperature of 55 ° C. to 65 ° C. for 20 hours to 30 hours”
It is.

  The reason why the temperature condition of the aging treatment is set to 55 ° C. to 65 ° C. is that when the aging treatment is performed at a temperature higher than this range, the molded cup container 10 is deformed and is lower than this range. This is because sufficient bleed out cannot be obtained even if aging treatment is performed at a temperature.

  Moreover, the time condition of the aging treatment is set to 20 hours to 30 hours. If the time condition is larger than this range, the bleedout amount of the antistatic agent 11 does not increase so much, and the bleedout amount of the antistatic agent 11 is increased. This is because it becomes more than necessary, and if it is smaller than this range, sufficient bleed out of the antistatic agent 11 cannot be expected.

  As a result, the cup container 10 according to claim 2 in which the existing equipment is used as it is and the antistatic agent 11 is bleed out as much as necessary can be reliably manufactured.

As described above, in the present invention,
"Least be formed of antistatic agent 11 nonionic cup shape by synthetic resin having free 0.2% to 0.3%, Ca-up for accommodating the semi-solid or pasty contained object A container 10,
By aging the cup container 10, the antistatic agent 11 was bleed out on the surface of the cup container 10. "
Has a main feature in its structure, which makes it easy to take out a semi-solid container such as tofu, and has excellent releasability that can prevent the collapse of the container at the time of removal. A cup container 10 can be provided.

The present invention also provides:
"It is formed at least a nonionic antistatic agent in a cup shape by a synthetic resin containing 0.2% to 0.3%, to produce a Ca-up vessel 10 containing a semi-solid or pasty contained object A method,
After the cup container 10 was integrally formed with a synthetic resin containing at least an antistatic agent 11, the cup container 10 was aged to cause the antistatic agent 11 to bleed out on the surface of the cup container 10. Manufacturing method of cup container characterized by that "
Therefore, the cup container 10 in which the antistatic agent 11 is bleed-out as much as necessary can be reliably manufactured by using the existing equipment as it is.

  Hereinafter, the best mode of the present invention will be described in detail along with its manufacturing method based on the cup container 10 shown in the drawings. The cup container 10 is made of a synthetic resin that is transparent or translucent as a whole. In addition to a base material made of a thermoplastic resin such as polyethylene, polypropylene, polystyrene, polyamide, etc., the synthetic resin material constituting the cup container 10 is antistatic for preventing the generation of static electricity and preventing the adhesion of dust. The agent 11 and the slip agent for making the surface easy to slip are contained.

  As the antistatic agent 11, for example, polyhydric alcohols (polyols) such as ethylene glycol, glycerin, polyester, and polyether, and surfactants are preferably used. Since it is possible to further improve the releasability, it is more preferable to contain a surfactant. In addition, as said slip agent, fatty acid amide and stearyl alcohol are used suitably, for example.

  The antistatic agent 11 used in this best mode is a nonionic (nonionic) surfactant, and the antistatic agent 11 does not ionize as ions even when dissolved in water. That is, the antistatic agent 11 is widely used in foods, cosmetics, spermicides, etc. in addition to detergents, and the specific ones used in this best mode are glycerin fatty acid esters, It mainly contains diethanolamine.

  As shown in FIG. 1, the cup container 10 includes a bottom wall 12, a peripheral wall 13 rising from now on, a leg portion 14 integrally formed at the lower end of the peripheral wall 13, and a boundary portion between the leg portion 14 and the peripheral wall 13. And the peripheral flange 16 operated at the upper end of the peripheral wall 13. In addition, in order to simplify the structure of the cup container 10, the leg part 14, the cyclic | annular protrusion 15, or the peripheral flange 16 can be abbreviate | omitted as needed.

  That is, as shown in FIG. 1, the cup container 10 has a cup shape (bottomed cylindrical shape) from a bottom wall 12 formed in a disk shape and a peripheral wall 13 erected from the periphery of the bottom wall 12. ). Further, the peripheral wall 13 is formed in a tapered shape that slightly expands upward, and the cup containers 10 are nested in a nesting state, that is, the cup container 10 positioned above in the internal storage space of the cup container 10 positioned below. In a state where the bottom portion is inserted, it is configured so that it can be stacked vertically and stored in a small and compact manner.

  A cylindrical leg 14 is suspended from the lower end of the peripheral wall 13 so that the cup container 10 can be stably supported. Further, an annular protrusion 15 is provided on the inner peripheral surface of the lower end portion of the peripheral wall 13 so as to slightly protrude inward. With this configuration, when a plurality of cup containers 10 are stacked up and down in a nesting state, the upper and lower cup containers are brought into contact with the lower end edge of the leg portion 14 of the cup container 10 positioned above the annular protrusion 15. A slight gap is formed between the ten peripheral walls 13 so that the cup containers 10 can be easily stacked or separated.

  In addition, a peripheral flange 16 that continuously extends outwardly projects from the upper end of the peripheral wall 13. And with this configuration, the strength of the upper end portion of the cup container 10 can be kept high, and the outer peripheral portion of the lid formed in a circular shape with a synthetic resin sheet or an aluminum sheet (not shown) is heat-sealed, The upper opening of the cup container 10 can be sealed.

  The shape of the cup container 10 is not limited to the bottomed round cylindrical shape as shown in FIG. 1, for example, a bottomed polygonal cylinder such as a bottomed square cylindrical shape, a bottomed hexagonal cylindrical shape, or a bottomed octagonal cylindrical shape. Or a cup shape such as a cylindrical shape with a bottom. Even in such a configuration, the object of the present invention can be achieved.

  For example, yogurt, ice cream, jelly, cake, and the like can be accommodated in the cup container 10 as well as tofu such as cotton tofu and sesame tofu. Moreover, the chopped leek, grated ginger, etc. as a seasoning can also be accommodated in the upper end part, lower end part, or peripheral part of such an accommodation.

  Next, the manufacturing method of the cup container 10 will be described. In order to manufacture the cup container 10, first, a synthetic resin material containing a base material, an antistatic agent 11 of 0.3% or less, and a necessary slip agent is formed by ordinary injection molding using a mold (not shown). Molded into a cup shape by the method. It should be noted that the mold may or may not have a concave-convex cavity for forming a rough surface.

  The cup container 10 molded as described above is aged to cause a part of the antistatic agent 11 to bleed out (precipitate) on the surface of the cup container 10 as shown in FIG. It is. That is, after the cup container 10 is integrally formed with a synthetic resin containing the antistatic agent 11 (0.2% to 0.3%), the cup container 10 is subjected to an aging treatment, whereby the cup container 10 The antistatic agent 11 is bleed out on the surface. The aging treatment conditions in the best mode are a temperature of 55 ° C. to 65 ° C. and a time of 20 hours to 30 hours.

  When the cup container 10 formed as described above was analyzed by the following method, the results shown in FIG. 2 were obtained. As a comparative example, the cup container 10 not subjected to the aging treatment was also analyzed, and the result is shown in FIG.

  First, the insides of the cup container 10 according to the present invention and the cup container 10 that has not been subjected to the aging treatment are washed with “acetone”, and these washings are analyzed by a gas chromatographic method. Results were obtained. 2 and 3, a peak is observed at the detection position of the antistatic agent 11.

  In the cup container 10 according to the best mode of FIG. 2, the concentration of the antistatic agent 11 was 1.33 mg / piece. However, in the cup container 10 not subjected to the aging treatment, as shown in FIG. The concentration of the inhibitor 11 was 0.22 mg / piece. This means that in the cup container 10 according to the present invention, the antistatic agent 11 is bleeded out by about 6 times as compared with the case where the aging treatment is not performed.

  In addition, 100 cup containers 10 according to the best mode were prepared, tofu was stored therein, each was subjected to retort sterilization treatment for 1 hour, and then opened for 3 hours. For all of the containers 10, the tofu was removed cleanly. On the other hand, when tofu was stored in 100 cup containers that were not subjected to aging treatment, each was subjected to retort sterilization treatment for 1 hour and then opened for 3 hours. The portion remained and the tofu could not be removed cleanly.

It is a partially broken perspective view of the cup container according to the present invention. It is the graph by the gas chromatograph method which put acetone in the same cup container, wash | cleaned, and analyzed the residual degree of the antistatic agent in this washing | cleaning liquid. It is the graph by the gas chromatograph method which put acetone in the cup container which has not performed the aging process, wash | cleaned, and analyzed the residual degree of the antistatic agent in this washing | cleaning liquid.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Cup container 11 Antistatic agent 12 Bottom wall 13 Perimeter wall 14 Leg part 15 Annular protrusion 16 Peripheral flange

Claims (4)

Least is formed into a cup shape by also nonionic antistatic agent and 0.2% to 0.3% containing a synthetic resin, in mosquito-up container containing a semi-solid or pasty contained object There,
A cup container having excellent releasability, wherein the antistatic agent is bleed out on the surface of the cup container by aging the cup container.   2. The cup container with excellent releasability according to claim 1, wherein the aging treatment condition is a temperature of 55 ° C. to 65 ° C. for 20 hours to 30 hours. In a method of manufacturing at least nonionic antistatic agent is formed into a cup shape by 0.2% to 0.3% containing synthesized resin, mosquito-up container containing a semi-solid or pasty contained object There,
The cup container is integrally molded with a synthetic resin containing at least an antistatic agent, and then the cup container is aged to cause the antistatic agent to bleed out on the surface of the cup container. To manufacture a cup container.   The said aging process conditions are the temperature of 55 to 65 degreeC, and are 20 hours-30 hours, The manufacturing method of the cup container of Claim 3 characterized by the above-mentioned.

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