JP3548581B2 - Packaging material for perishable foods and method for producing the same - Google Patents

Description

[0001]
[Industrial applications]
The present invention is directed to a packaging material for fresh food having appropriate air permeability and water absorbency and a method for producing the same, and in particular, surplus water is discharged while evaporating and evaporating moisture blown out from fish or meat through a vent hole. The present invention relates to a packaging material for perishable foodstuffs capable of suppressing corrosion of packaged fish, meat, etc. by absorbing water of the present invention and a method for producing the same.
[0002]
[Prior art]
BACKGROUND ART Conventionally, various food packaging films have been provided to maintain the freshness of fish, meat, and the like. As a raw material of such a packaging film, for example, there is a material using polyvinylidene chloride, and a softener such as a fatty acid derivative and a stabilizer such as an epoxidized vegetable oil are added to the film to form a film.
[0003]
[Problems to be solved by the invention]
However, such a conventional food packaging film has a simple structure made of a mixture of polyvinylidene chloride and the like, and has a structure that hardly allows not only water but also air to pass through. If moisture is blown out from fish or meat packed in a package, the moisture remains in the film, and microorganisms adhere to the moisture to propagate, and there is a problem that corrosion of fish and meat progresses at an early stage. Was.
[0004]
The present invention has been made in view of such conventional problems, and makes it possible to evaporate moisture blown out from packaged fish, meat, and the like to the outside from an air hole, and to absorb excess moisture remaining in a film. By doing so, it is an object of the present invention to prevent microorganisms from adhering to and proliferating the spouted water, suppress the corrosion of fish and meat, and enable long-term storage.
[0005]
[Hand stage for Solving the Problems]
To achieve the above object, the packaging material of perishable goods in the present invention is a packaging material which is integrally formed by superimposing the cellophane cover film is a base film, the base film is water-to absorb moisture The covering film is formed of a thermoplastic resin such as a polyethylene film or a vinyl acetate resin film, which is more easily melted than the base film, and a large number of air holes are formed on the entire surface of the covering film. It is characterized by having been established.
[0007]
The manufacturing method of the packaging material of the invention, after forming integrally by superposing coating film of a polyethylene film or a vinyl acetate resin film arm in cellophane as a base material film is a breathable member to absorb moisture, the outer periphery While the projecting roll provided with a large number of perforating needles on its surface and a smooth roll having a smooth outer peripheral surface are in rotational contact, the coating film is disposed on the protruding roll side and passed therethrough, and the coating film is pierced by the perforating needles. It is characterized in that a ventilation hole is formed only in the hole.
[0008]
Then, as compared with the cellophane film is a base film formed of a thermoplastic resin in a molten easily polyethylene film or a vinyl acetate resin film arm, after forming integrally by superimposing this coating film, a large number on the peripheral surface Providing the coating film on the side of the projection roll while the projection roll and the smooth roll having a smooth outer peripheral surface heated to a temperature at which only the thermoplastic resin can be melted are provided. It is also possible to allow the gas to pass through and melt the coating film by the heat of the needle-like projections to form a vent hole only in the coating film.
[0009]
Further, a laser beam can be emitted-before the laser device, the coating film formed of a thermoplastic resin is disposed on the laser device side and passed therethrough, and the coating film is melted by the heat of the laser beam to melt the coating film. The ventilation hole may be formed only in the ventilation hole.
[0010]
[Action]
When water is blown out from fish, meat, etc. wrapped with the packaging material for fresh food , much of the water is blown out through ventilation holes and evaporates into the atmosphere, while excess water remaining in the film is used as a base. Is absorbed by the material film. Therefore, the blown water does not remain on the surface of fish, meat, etc., and the microorganisms do not adhere to the water to propagate, so that the corrosion of fish, meat, etc. by the microorganisms can be suppressed.
[0011]
Further, by arranging the covering film on the side of the projecting roll and passing the film between the projecting roll and the smoothing roll, a perforating needle is pierced from the side of the covering film and comes into contact with the surface of the smoothing roll. At this time, the tip of the perforating needle penetrates the coating film, but because the base film cannot penetrate by contacting the surface of the smooth roll, the vent hole is formed only in the coating film without making a hole in the base film. Can be perforated.
[0012]
Furthermore, by disposing a coating film made of a thermoplastic resin on the side of the protrusion roll or the laser device and passing the film between the protrusion roll and the smooth roll or through the laser device, heat of the needle-shaped protrusions of the protrusion roll or laser Due to the heat of the laser beam of the device, it is possible to perforate only the covering film without perforating the base film.
[0013]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0014]
1 and 2 are a cross-sectional view and a plan view showing one embodiment of a packaging material according to the present invention. In the figure, 1 is a base film made of a cellophane film , 2 is a covering film, and this base film 1 is formed of a water-absorbing / breathable member having both water-absorbing and gas-permeable properties for absorbing moisture. . The covering film 2 is formed of a member made of a material different from that of the base film 1. The substrate film having a water-absorbing breathable Ru can be applied cellophane. Also, as the coating film 2, for example, although a thermoplastic resin such as polyethylene film or a vinyl acetate resin film is preferable, as long as it vents 3 such that at least later be formed relatively easily.
[0015]
A large number of air holes 3 are formed on the entire surface of the coating film 2, and moisture can enter and exit between the front and back surfaces through these air holes 3. Since these air holes 3 are closed by the base film 1, the size of the air holes 3 can be arbitrarily set, but usually the diameter is 0.1 mm to 2.0 mm. Omm is preferred. The covering film 2 and the base film 1 are overlaid and integrally formed by various fixing means such as heat fusion or bonding with an adhesive. The vent hole 3 is perforated by the perforating device described later in the integrally formed bonding film 4. FIG. 3 is a cross-sectional view showing an example in which the base film 1 and the covering film 2 are fixed to each other using an adhesive 5 to form a three-layer structure.
[0016]
FIG. 4 is a schematic explanatory view showing an embodiment of a perforation device for perforating the ventilation holes 3 in the coating film 2. The piercing device 6 includes a protruding roll 8 provided with a large number of piercing needles 7 on the outer peripheral surface, and a smooth roll 9 with a smooth outer peripheral surface. At the same time, the tip of the perforating needle 7 is arranged so as to be in contact with the outer peripheral surface of the smoothing roll 9 on a plane including the axis. The projecting roll 8 and the smoothing roll 9 are configured to rotate in opposite directions. The covering film 2 is disposed on the projecting roll 8 side, and the joining film 4 is rotated in the rotation direction of the two rolls 8 and 9. The sheet is fed into the punching device 6 from the near side.
[0017]
When the bonding film 4 is fed between the projecting roll 8 and the smoothing roll 9 rotating in the opposite directions of the punching device 6, as shown in an enlarged view in FIG. It is stabbed from the covering film 2 side, penetrates the covering film 2 and is stabbed into the base film 1. When the piercing needle 7 reaches a plane including the axis of the two rolls 8 and 9, the surface of the thin film 1 is aligned with the surface of the smooth roll 9, and the piercing needle has a conical shape. Since the tip of 7 comes into contact with the outer peripheral surface of the smoothing roll 9 almost at a point, the perforating needle 7 does not penetrate the base film 1. Therefore, the ventilation holes 3 are perforated in the covering film 2 due to the insertion of the perforation needles 7, but the ventilation holes are not perforated in the base film 1. Incidentally, according to the drilling device 6, Ru can drilled vent holes 3 only stab inclusive perforation needles 7.
[0018]
FIG. 6 shows a state in which the ventilation holes 3 are drilled by another type of drilling device. In the perforation apparatus 10, a ventilation hole 3 is formed by providing a heat source on the side of the projection roll 11 and locally melting the coating film 2. Therefore, it is necessary to make the material of the covering film 2 a thermoplastic resin such as a polyethylene film or a vinyl acetate resin film, and to make the material of the base film 1 more difficult to melt than the material of the covering film 2. In addition, since the perforating device 10 is configured to locally melt the coating film 2 by the heat of the perforating needle 12 pierced into the covering film 2 and perforate the ventilation hole 3, the tip of the perforating needle 12 Are slightly separated from each other so as not to contact the outer peripheral surface of the smoothing roll 9.
[0019]
Further, FIG. 7 shows an example in which a laser device is applied as another type of perforation device. The laser device 14 emits a laser beam toward the bonding film 4, and heats the laser beam to locally melt only the surface-side coating film 2, thereby perforating the ventilation hole 3. Therefore, the output of the laser beam needs to be set to such an intensity that the coating film 2 can be melted but the base film 1 on the back side cannot be melted.
[0020]
As an application of the packaging material in which the ventilation holes 3 are pierced by the above-described piercing device, for example, it can be applied as a packaging material for packaging fresh food products such as fish and meat. In this case, the present packaging material wraps fish, meat, and the like with the base film 1 inside. Accordingly, when water is blown out from fish, meat, or the like packaged with the present packaging material , the water is absorbed by the base film 1, and most of the water is blown out to the outside through the ventilation holes 3 and evaporates to the atmosphere. On the other hand, excess water remaining in the base film 1 is retained in the base film 1, so that the blown water does not remain on the surface of fish, meat, etc., and therefore, the water blown from fish, meat, etc. Microorganisms do not adhere to and proliferate, so that corrosion of fish and meat by microorganisms and the like can be suppressed. And since the ventilation hole 3 is relaxed by the base film 1, there is no possibility that insects or the like may enter through the ventilation hole, and therefore, fresh food can be held in a hygienic manner for a long period of time.
[0021]
【The invention's effect】
As described above, the present invention is configured as described above, and has the following effects.
[0022]
According to the water-absorbing and breathable packaging material of claims 1 and 2, when water is blown out from fish, meat, or the like wrapped with the present packaging material , the moisture is absorbed by the base film, and most of the moisture is vented. The air is blown out of the covering film through the air hole, and is evaporated into the atmosphere from the front side of the ventilation hole, and excess moisture remaining in the base film is retained by the base film. Therefore, since the water that has been blown out does not remain on the surface of fish or meat, microorganisms do not adhere to the water that has been blown out of the fish or meat, and do not propagate. A packaging material that can be suppressed can be provided. Since the air holes are closed by the base film, there is no possibility that insects or the like enter the inside from the air holes, and therefore, an effect that fresh food can be held in a hygienic manner for a long time can be obtained.
[0023]
Further, according to the method for producing a packaging material for fresh food having water-absorbing property and breathability according to claims 3 to 5, ventilation holes can be formed only in the covering film without forming holes in the base film, The drilling operation can be performed easily and reliably.
[Brief description of the drawings]
FIG. 1 is a sectional view showing one embodiment of a packaging material according to the present invention.
FIG. 2 is a plan view of FIG.
FIG. 3 is a sectional view showing another embodiment of the packaging material according to the present invention.
FIG. 4 is a schematic explanatory view showing one embodiment of the perforation mounting according to the present invention.
FIG. 5 is an enlarged view of a main part for explaining a perforation state by the perforation device of FIG.
FIG. 6 is a schematic explanatory view showing a second embodiment of the punching device according to the present invention.
FIG. 7 is a schematic explanatory view showing a third embodiment of the punching device according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Base film 2 Coating film 3 Vent 6,10 Punching device 7,12 Punching needle 8,11 Projection roll 9 Smooth roll 14 Laser device (Punching device)

Claims (4)

In a packaging material integrally formed by laminating a coating film on a cellophane that is a base film, the base film is formed of a water-absorbing and breathable member that absorbs moisture, and the coating film is compared with the base film. A packaging material for fresh food, wherein the packaging film is formed of a thermoplastic resin such as a polyethylene film or a vinyl acetate resin film which is easy to melt and has a large number of air holes perforated on the entire surface of the coating film. After integrally formed by superposing a coating film comprising a polyethylene film or a vinyl acetate resin film cellophane film is a water-permeable member to absorb moisture, projection roll and the outer peripheral surface provided with a plurality of perforation needles on the outer peripheral surface Wherein the coating film is disposed on the projection roll side and passed therethrough while the roller is in rolling contact with the smooth smooth roll, and a vent hole is formed only in the coating film by piercing the perforating needle. Manufacturing method of food packaging material. The cellophane film is a water-permeable member to absorb moisture, formed integrally compared with superimposed coating film formed of a thermoplastic resin such as polyethylene film or a vinyl acetate resin film arm easily melted the cellophane film After that, a large number of needle-shaped projections are provided on the outer peripheral surface, and the coated film is formed while the projection roll heated to a temperature at which only the thermoplastic resin can be melted and the outer peripheral surface is rotated with a smooth smooth roll. A method for producing a packaging material for fresh food, characterized in that the coating film is melted by the heat of the needle-like projections, and the ventilation holes are formed only in the coating film. The cellophane film is a water-permeable member to absorb moisture, formed integrally compared with superimposed coating film formed of a thermoplastic resin such as polyethylene film or a vinyl acetate resin film arm easily melted the cellophane film After that, before the laser device capable of irradiating a laser beam, the coating film is disposed on the laser device side and passed therethrough, and the heat of the laser beam melts the coating film to form a ventilation hole only in the coating film. A method for producing a packaging material for a fresh food product.

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