JPH0123369B2 - - Google Patents

Description

[Detailed Description of the Invention] <<Industrial Application Field>> The present invention relates to a vacuum packaging method, and more particularly to a novel vacuum packaging method for obtaining a package that does not leave wrinkles on the outside of the packaged product storage recess. be.

<<Prior art>> Conventionally, in order to vacuum package ham, etc., the product to be packaged, such as ham, is placed in a predetermined position on the lower film while the both edges of a continuous lower film are held and transferred intermittently. A recessed portion is formed, and after storing the packaged product such as ham in the recessed portion, the upper portion thereof is covered with an upper film and vacuum-sealed (for example, JP-A-51-11268).

The recessed portion for storing the packaged product such as ham is slightly larger than the outer diameter of the ham or the like to be stored.

In addition, there is also one in which the entire concave portion is heated and shrunk so as to be brought into close contact with the periphery of the ham, etc. (Japanese Patent Laid-Open No. 112184/1984).

≪Problems to be solved by the invention≫ However, depending on the type of ham and manufacturing method,
There are large variations in the finished dimensions, and the distance between the recess and the ham may be larger than expected. In such a case, if vacuum sealing is applied using the conventional packaging method, the film formed in excess of the ham dimensions will tightly wrinkle and remain on the outer periphery of the ham, impairing its appearance. .

Furthermore, as time passes, the oil contained in the ham separates and oozes out, accumulating in the wrinkles, ruining the aesthetic appearance and lowering the product value (see Figure 7).

On the other hand, when heat-shrinking, conventionally the entire recess is heat-shrinked, so wrinkles occur over the entire recess, that is, the entire bottom, which also serves as the display section, and the above-mentioned problem is exacerbated.

Furthermore, there is a risk that the entire recessed portion will heat-shrink, compressing the entire packaged product such as ham, and causing it to lose its shape (see FIG. 6).

This invention was made in view of the above-mentioned problems, and its purpose is to create a vacuum that can produce a package that does not leave wrinkles on the outer periphery of the packaged product storage recess and that does not lose its shape. We provide packaging methods.

<<Means for Solving the Problems>> In order to achieve the above-mentioned object, in the vacuum packaging method according to the present invention, while the continuous lower film is being transferred intermittently while pinching both side edges of the lower film, the lower film is In the deep drawing type vacuum packaging method, a recess for storing the packaged product is formed at a predetermined position of the package, the packaged product is stored in the recess, and a continuous upper film is coated from above, and then the packaged product is vacuum-sealed. The bottom surface of the product storage recess is formed to be a curved surface, and in the pre-vacuum and sealing process, only the body of the recess is heat-shrinked while the product is stored in the product storage recess. It was brought into close contact with the packaged item, and then vacuum-sealed.

<<Example>> Hereinafter, a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

First, an example of an apparatus for carrying out the packaging method of the present invention will be explained.

Reference numeral 1 denotes a continuous belt-shaped lower film for molding, and 2 a conveyor for intermittently conveying the lower film for molding by holding both longitudinal edges of the lower film for molding 1, such as an endless chain equipped with a large number of gripping claws 3. be. 4 is a continuous band-shaped lid film, and 5 is a concave portion 5' for storing the packaged product in the lower molding film.
6 is a vacuum,
A vacuum sealing device for sealing, 7 a horizontal cutter device, 8 a vertical cutter device, and 9 a product to be packaged, such as a ham. Reference numeral 10 denotes a heat shrinking device which is configured to surround each of the molded film recesses 5', heat the outer peripheral side of the recesses 5', and cool the bottom surface of the recesses 5'. 11 is a heater in the heat shrinking device, 12 is a cooling plate, and 13 is a heating body.

Next, a packaging method using the above-mentioned apparatus will be explained.

The lower film 1 is held at both side edges by the film holding claws 3 and moved intermittently to a predetermined size, and in the film forming device 5, the bottom surface of the film recess 5' is curved as shown in FIG. Then, a packaged product such as ham 9 is filled into the recess 5'.

In this state, only the body of the film concave portion 5' is heated and shrunk in the heat shrinking device 10, and the film is brought into close contact with the side of the packaged item 9, such as ham. In this case, a cooling plate 12 is disposed on the lower side so as not to heat the bottom surface of the recess 5' during the thermal contraction. Then, only the body of the recess 5' heat-shrinks and comes into close contact with the side periphery of the ham etc. 9, but at this time, the curved portion of the film with a margin at the bottom of the recess 5' does not shrink (the bottom (not heated), as the body of the recess 5' contracts, it is stretched and tightly adheres to the bottom surface of the ham etc. 9 in a moderately tensioned state without wrinkles or the like.

Then, vacuum and airtight sealing is performed in the vacuum sealing device 6 in the same manner as in the prior art.

In this example, a case is illustrated in which a total of 6 pieces in 3 rows and 2 stages are packaged at the same time. The cutter device cuts each product in the longitudinal direction to form individual packages.

<<Effects of the Invention>> As described above, according to the present invention, the bottom surface of the container recess is formed into a curved shape in the film forming apparatus, and only the body of the recess is heated while the packaged product is in a contracted state. Since the film is made to shrink, when only the body of the film concave portion shrinks and comes into close contact with the side of the packaged product, the bottom portion of the film, which is formed into a curved shape to provide a margin, will absorb the shrinkage of the body. It is pulled by the ham and is brought into close contact with the bottom of the ham under moderate tension. As a result, it is possible to obtain a beautiful vacuum package that does not intentionally pressurize the packaged product to deform its form, and has no wrinkles and has appropriate tension.

[Brief explanation of drawings]

The figures show one embodiment of the present invention, in which Figure 1 is an explanatory diagram of the process, Figure 2 is a plan view of the main parts of the present invention, and Figure 3 is a plan view of the main part of the present invention.
The figure is a sectional view taken along line A-A in FIG. 2, FIG. 4 is a sectional view showing examples of packaged product storage recesses, FIG. 5 is a sectional view of the finished packaged product, and FIGS. 6 and 7 are conventional packaging. It is a figure showing the packaged finished product manufactured by the method. DESCRIPTION OF SYMBOLS 1... Lower film for molding, 4... Lid side film, 5... Film forming device, 5'... Recessed part, 6
...Vacuum sealing device, 9...Ham (packaged product),
10... Heat shrinkage device.

Claims (1)

[Claims] 1. While the continuous lower film is being transferred intermittently by pinching both side edges thereof, a packaged product storage recess is formed at a predetermined position of the lower film, and the packaged product is stored in the recess and the packaged product is continuously transferred from the upper side. In a deep-drawing vacuum packaging method in which the upper film is coated and then vacuum sealed, the bottom surface of the packaged product storage recess is formed into a curved surface, and in the step before vacuum and sealing, the A vacuum packaging method characterized in that, with the packaged product stored in the packaged product storage recess, only the body of the recess is heat-shrinked to bring it into close contact with the packaged product, and then vacuum-tightly sealed.