JP2011006152A - Food film case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a food film case capable of eliminating the need for blocking prevention treatment or limiting the treatment to only one surface, in addition to much goodness in improving environmental protection or food safety at low cost relating to the food film case, for example used for storing supplementary food in a lunch box.SOLUTION: Aqueous ink printing 4 is applied to a case body 3. In addition, a film body may be provided which is bonded to the case body 3 so as to cover the printing 4. Further, nonsolvent-based adhesive may be used for bonding the case body 3 and the film body.

Description

  The present invention relates to a food film case that is used, for example, for containing a secondary food in a lunch box.

  In recent years, lunch boxes sold at convenience stores often contain food such as side meals contained in a film case, and this film case has the necessary display and good appearance. Some of them are printed for the purpose.

JP-A-6-328552

  By the way, as the ink used for the printing, oil-based inks containing petroleum-based organic solvents (volatile solvents) such as toluene, ethyl acetate, and MEK (methyl ethyl ketone) are widely used, and printing is performed on the film case. There is concern that organic solvents volatilized in the process and the like may cause environmental pollution. In order to prevent environmental pollution caused by this organic solvent, the film case factory has a highly airtight structure to prevent the organic solvent from leaking to the outside, and the organic leaked into the work environment of the factory, etc. Measures must be taken to ensure that the solvent is recovered, but implementing them is costly and time consuming and quite difficult to implement.

  In addition, the printing is performed on the outer surface of the film case so that the food stored inside the film case does not come into contact with the food. For example, the lunch box is inclined during its transportation and the food comes into contact with the printing. As a result, the organic solvent remaining in the food may affect the quality of the food. In view of the above, at present, the movement to regulate the use of the organic solvent itself has been activated at the national and local government levels.

  On the other hand, there is a film case in which the printed surface is covered with a film body. By using this film case, the food body in the lunch box is prevented from coming into direct contact with the printing, and the problem of residual solvent is solved. Has been thought to be done. However, as a result of being able to measure to a level (unit of IPPM) that could not be measured by the latest detector, a considerable amount of organic from printing that should be sealed between the film case and the film body The reality is that it is impossible to deny the possibility that the solvent has flowed out and mixed into the food.

  The organic solvent flows out as described above, which is considered to be caused not only by the organic solvent passing through the film body but also directly flowing out through a number of pinholes that are generated when the film case is molded, It has also been pointed out that there is a danger that the oil content of the food adhering to the film body further accelerates the spill. In addition, the film case may be warmed together with the lunch box in a microwave oven, and when such heating is performed, the organic solvent that forms the printing applied to the film case volatilizes, and a larger amount of organic The solvent will remain in the food. As is clear from the above, even if a film case provided with a film body is used, there is a possibility that the safety of food may be impaired by the organic solvent.

  Further, in the film case provided with the film body, the organic solvent is not only contained in the ink, but may also be contained in an adhesive for bonding the film body to the film case. In addition, the amount of the organic solvent that volatilizes increases during various processes such as a film case printing process, a laminating process, and a thermoforming process, and when heating a lunch box. Therefore, it has been inconvenient for improving environmental protection and food safety.

  Furthermore, since a plurality of film cases are heat-molded at a time and the plurality of film cases are in a laminated state at this time, so-called blocking (overlapping film cases are not peeled off from each other) when the releasability is low. Defect). Therefore, as shown in Patent Document 1, it is conceivable to improve the releasability by subjecting each film case to corona discharge treatment. In this case, corona discharge for blocking prevention on each of the front and back surfaces of the film case. Processing must be done.

  The present invention has been made in consideration of the above-mentioned matters. The purpose of the present invention is very useful in reducing environmental protection and improving food safety at a low cost, and in addition, a processing for preventing blocking is performed. It is an object to provide a food film case that can be unnecessary or can be provided only on one side.

  In order to achieve the above object, the film case for food of the present invention is characterized in that the case main body is printed with water-based ink (claim 1).

  Moreover, the film body adhere | attached on a case main body in the state which covers the said printing may be provided (Claim 2).

  Furthermore, a non-solvent adhesive may be used for bonding the case body and the film body (claim 3).

  In the invention according to claim 1, since printing is performed with water-based ink and oil-based ink containing organic solvent is not used, problems of environmental pollution due to organic solvent and residual solvent of food are solved, and environmental protection and safety of food are improved. A film case for food that is very useful for improving the cost at a low cost can be obtained. Further, in the present invention, the release property is improved by applying the water-based ink, so that the treatment for preventing blocking becomes unnecessary.

  In the invention according to claim 2, since the printing is covered with the film body, there is no possibility that the food comes in direct contact with the printing, and a food film case capable of greatly improving the quality and safety of the food is obtained.

  In the invention according to claim 3, since the adhesive for adhering the case main body and the film body is non-solvent, it is not necessary to use an adhesive containing an organic solvent. It is possible to obtain a film case for food that is extremely useful for improving safety at low cost.

It is explanatory drawing which shows roughly the structure of the film case for foodstuffs concerning 1st Embodiment of this invention. It is explanatory drawing which shows roughly the structure of the film case for foodstuffs concerning the 2nd Embodiment of this invention.

  FIG. 1 is an explanatory view schematically showing a configuration of a food film case (hereinafter referred to as a film case) according to a first embodiment of the present invention. The film case is formed by using a film made of a material as described later, and is used for storing food such as a side meal, and has strength (flexibility), size according to the properties of the food to be stored, It has water repellency and the like as appropriate. The film case includes a case main body 3 including a bottom portion 1 that is substantially circular in plan view and extends horizontally, and a corrugated side wall portion 2 that rises from the periphery of the bottom portion 1.

  Here, the material constituting the case main body 3 does not affect the quality of food such as a side meal accommodated inside the case main body 3, and is excellent in terms of economy, heat resistance, shape retention and the like. Preferably it is. Examples of such a material include synthetic resins such as PET (polyethylene terephthalate), OPP (biaxially stretched polypropylene), and OPS (biaxially stretched polystyrene). Although some can be used, those derived from plants such as polylactic acid are particularly desirable.

  Further, as shown in FIG. 1, water-based printing (water-based gravure printing) 4 using water-based ink is applied to the outer surface (lower surface) of the case body 3. Specifically, the water-based printing 4 is performed using an ink resin mainly composed of water-soluble acrylic and water-soluble urethane resin, and a solvent containing water and some alcohol. Therefore, the aqueous printing 4 contains almost no petroleum-based organic solvent such as toluene, ethyl acetate, or MEK.

  Note that a curing agent may be mixed with the water-based ink. In this case, the water-based printing 4 is more difficult to be peeled off, and the heat resistance is improved to help prevent blocking. This anti-blocking effect is particularly suitably exhibited when the case body 3 is formed of OPP which has a lower heat resistance than PET and is likely to cause blocking.

  Here, the water-based printing 4 may be appropriately covered. Hereinafter, a film case according to the second embodiment configured as described above will be described.

  FIG. 2 is an explanatory view schematically showing a configuration of a film case according to the second embodiment of the present invention. In addition, the same code | symbol is attached | subjected about the member same or equivalent to what was shown in FIG. 1, and the description is abbreviate | omitted. As shown in FIG. 2, the film case of the second embodiment includes a film body 5 that is bonded to the case body 3 in a state of covering the water-based printing 4. A non-solvent adhesive 6 is used.

  More specifically, the film body 5 is made of, for example, PET, OPP, or OPS, and the combination thereof is appropriately selected depending on the application and the like, and is configured to cover the entire outer surface of the case body 3.

  In addition, as a method of laminating the case body 3 and the film body 5 using the adhesive 6, a thermal laminate is adopted in addition to a normal dry laminate, a non-solvent laminate or an aqueous laminate. Is preferred.

  Further, as a process for preventing blocking, the lower surface of the film body 5 is matted. This mat processing is processing with silica (silicon), and since it is a well-known processing, the detailed description is abbreviate | omitted.

  In addition, this invention is not restricted to said embodiment, It can implement in various deformation | transformation. Specifically, the case body 3 can have various shapes. For example, the plan view of the bottom portion 1 is not limited to a substantially circular shape, and may be a rectangular shape, an elliptical shape, or the like. Moreover, the side wall part 2 may be partly corrugated instead of all.

  The case main body 3 is not limited to one made of a synthetic resin, and may be made of paper (Japanese paper or the like), aluminum foil, and a composite thereof.

1 bottom 2 side wall 3 case body 4 printing

Claims (3)

  A film case for food, wherein the case body is printed with water-based ink.   The film case for foodstuffs of Claim 1 with which the film body adhere | attached on a case main body in the state which covers the said printing is provided.   The film case for food according to claim 2, wherein a non-solvent adhesive is used for bonding the case body and the film body.

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