JPH0230946B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a shrink package equipped with an easy-opening means and a packaging device for the same. The present invention relates to a shrink package formed with a series of small holes and a packaging device thereof.

(Prior art and its problems) Conventionally, easy opening means for Shrink packaging include one in which a tear tape is attached to the packaging film, and one in which a series of small holes are formed in the packaging film itself. Common.

However, in the case of using a tear-opening tape, in addition to the cost of the tape itself, an adhesive layer for adhering the tape to the film and an adhesion device for this are required, resulting in a considerable increase in the overall cost. An even bigger drawback is that tear tape requires greater strength than packaging film, so it is thicker than packaging film.
When these are heat-treated for shrink packaging, a difference in shrinkage occurs between the two due to the difference in heat shrinkage rate, and as a result, wrinkles occur in the relevant part of the package.
There was a problem that the finish was poor.

Therefore, it has been considered desirable from economical and finish points of view to form a series of small holes in the packaging film itself as an easy-opening means, as shown in, for example, Japanese Utility Model Application Publication No. 50-25966. . However, when forming a conventional Shrink packaging body having a series of small through holes, perforation-like cuts were formed in the packaging film. After wrapping the packaged item, when the film is heat-shrinked tightly around the packaged item through a heat shrink tunnel, the notch opens and an elliptical shape with the perforation direction as the long axis is formed. As a result, a series of small through holes are formed. When opening the film, the film is pulled from both sides of the small through-hole, but since this oval-shaped small through-hole has no corners, a relatively large pulling force is required to break it, and the point where the break starts is stable. However, there was a problem that the fractured surface became jagged.

The present invention has been made in view of the above-mentioned problems, and its purpose is to provide a shrink package and a shrink package equipped with an easy-to-open means having an extremely simple structure that allows the film to be broken and opened in a straight line with a small amount of force. To provide the packaging equipment.

(Means for Solving the Problems) In the shrink package equipped with an easy-open means according to the first invention of the present application, each of the series of small through holes formed in the film of the shrink package is It has a corner in the vicinity of the through hole, the lines connecting the corners of each through hole are arranged in a substantially straight line, and the small through hole is formed into a polygonal shape larger than a square, such as an approximately diamond shape. It will be done.

Further, in the packaging apparatus for a shrink package according to the second invention of the present application, the cutting blade means for forming a series of small incisions in the shrink film for packaging while feeding the shrink film onto the object to be packaged is provided. The planar shape of each cutting blade shape is formed by a first blade portion aligned substantially in a line in the same direction as the arrangement direction of the series of cutting blade shapes, It consists of a second blade part that intersects with the first blade part.

(Embodiments) Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows the entire shrink packaging apparatus using horizontal pillow packaging according to an embodiment of the present invention, in which a shrink film 1 is pulled out from a roll 2 and passes through guide rollers 3a, 3b, 3c to a bag making device section 4. sent to. A cutting roller 5 faces the intermediate guide roller 3b among these rollers.
This cutting roller 5 is provided with cutting blade means 7 for forming a large number of small holes 6 for easy opening in the shrink film 1, as will be described later. 3b and 5, a large number of notches 7a are formed in a straight line across the lateral direction of the film 1.
Objects 8 to be packaged are sequentially fed into the bag-making device section 4 from behind at predetermined intervals by a conveyor belt 9. When the objects 8 to be packaged enter the bag-making device section 4, the top and sides thereof are covered with a shroud. It is covered with a link film 1 in a cylindrical shape. A pair of vertical sealing rollers 10a and 10b are arranged in front of the bag making device section 4, so that both ends of the shrink film that covers the packaged item 8 in a cylindrical shape are attached to the bottom surface of the packaged item. It is heat sealed vertically in the center. In front of the vertical seal rollers 10a, 10b, a vertical shaft 1 is provided with a pair of upper and lower horizontal seal cutter blades 11a, 11b.
2a and 12b are arranged, and when the shrink film 1 containing the object to be packaged 8 passes between them, the cylindrical shrink film 1 at the front and rear ends of the object to be packaged 8 are sealed in the lateral direction and at the same time are adjacent to each other. The packaged item is cut and separated from the shrink film that covers it. The packaged object 8 completely wrapped and sealed in the Shrink film is then introduced into the Shrink tunnel 13, where the Shrink film 1 is heat-shrinked and the packaged object 8 is sealed. The shrink package 14 can be obtained in close contact with the surface. And this shrink package 1
4, a large number of small holes 6 for easy opening formed as described above are arranged over the entire circumference in the lateral direction.

One of the inventions of the present application relates to an improvement of the cutting blade means 7 for forming a large number of notches 7a for easy opening in the shrink film 1 in the shrink packaging apparatus as described above, an example of which is shown in FIG. It is shown. This cutting blade means 7 is a series of independent cutting blades 15 extending along the axial direction of the cutting roller 5.
In the example shown in FIG. 2, each cutting edge shape 15 has a +-shaped planar shape. Specifically, first blade portions 15a are arranged substantially in a horizontal straight line along the axial direction of the cutting roller 5, and second blade portions are arranged to be substantially orthogonal to each of the first blade portions 15a. 15b.

As explained in FIG. When heat-shrinked in the Shrink tunnel 13, each of the small right-angled triangular film pieces in the + shape shrinks quickly, forming a small hole 6 in the shape of a diamond with the +-shaped notch as a diagonal line. A shrink package 14 according to the present invention as shown in FIG. 3 is obtained. In the shrink package 14 shown in FIG. A line connecting the directions pointed by the ends 6a and 6b is substantially a straight horizontal line.

In the first embodiment of the present invention described above, a large number of notches 7a were formed in the lateral direction of the shrink film 1;
This may be formed in the longitudinal direction so as to extend around the entire circumference of the shrink package 14' in the longitudinal direction, as shown in FIG. In this way, in order to form a series of cuts 7a' in the longitudinal direction of the shrink film 1, a series of cutting blade means are provided along the circumferential direction at the center of the cut roller 5, as shown in FIG. By protruding 7', this cutting blade shape 15' is arranged so that the first blade part 15a' arranged along the circumferential direction of the + character is adjacent to the first blade part 15a of the + character. ' and are arranged in a straight line in the circumferential direction. And in this example, the first
Second blade portions 15b' are provided perpendicularly to the blade portions 15a'.

The packaging apparatus according to the second embodiment differs from the first embodiment only in the arrangement of the cutting blade means 7', and the other configurations are the same as those of the first embodiment. The shrink package 14' formed by the apparatus of the second embodiment has each small hole 6' for easy opening formed in a substantially diamond shape, as shown in FIG. Both side ends 6a' and 6b' form acute corners, and the line connecting the directions pointed by both side ends 6a' and 6b' of the series of small holes 6' is approximately a straight line along the longitudinal direction of the package. It is becoming.

In the above embodiment, the planar shape of the cutting blade shape is a +-shape, but the shape is not limited to this, and for example, the angle formed with the first and second blade portions may be any angle other than orthogonal, or , it may be constructed from three or more blade parts.

(Effects) As described above, in the shrink package equipped with the easy-open means according to the first invention of the present application, the series of small through-holes 6,
Each of the holes 6' has corners at portions 6a, 6b, 6a', and 6b' close to the small through holes on both sides, and the lines connecting the corners of each hole are arranged in a substantially straight line. Moreover, since the shape of the small through hole is formed into a polygonal shape larger than a quadrangle, such as a substantially diamond shape, the direction in which the adjacent corners point is also located in a substantially straight line.
When the film parts on both sides of a series of small holes are pulled open, the film easily begins to tear from the above corner toward the corner of the adjacent small hole, and the film begins to tear apart from the corner of the adjacent small hole. The film is sequentially connected and cut in a straight line to be opened. Therefore,
To open the film, only a slight force is required to push the film open, and the film opens neatly in a straight line.

Further, the packaging apparatus according to the second invention for forming the above-mentioned shrink packaging body is different from the conventional shrink packaging apparatus in that the cutting blade means 7 having a series of independent cutting blade shapes 15 is used to form the shrink film. It is only necessary to provide the cutting blade in the conveyance path, and the planar shape of the cutting blade can be formed from the first blade and the second blade that intersects with the first blade. Although it is extremely easy to perform and has a relatively simple structure, the effects obtained are extremely large.

Furthermore, since the planar shape of the cutting blade is formed by the first blade and the second blade that intersects with the first blade as described above, small polygonal holes are formed in the film of the formed package. Although it is formed,
Since the triangular pieces of film defined by the cut line between the first blade part and the second blade part are contracted and drawn to each piece of the small through hole, the film on each side part is The strength is greater than that of the film between the holes, and the film is easily torn in a straight line.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the entire Shrink packaging device according to the present invention, and FIG. 2 is a perspective view showing a part of the device that forms a series of easy-open incisions in Shrink film, with the cut blade shape being uniform. FIG. 3 is a perspective view showing the shrink package obtained by the apparatus of FIG. 1, with the small hole for easy opening partially enlarged, and FIG. FIG. 5 is a perspective view showing a part of a device for forming an easy-open notch according to another embodiment, showing a partially enlarged cut blade shape, and FIG. FIG. 3 is a perspective view showing the shrink-wrapped packaging body, in which the easy-open small holes are partially enlarged. 1... Shrink film, 4... Bag making device section, 5... Cut roller, 6, 6'... Small hole, 6
a, 6b, 6a', 6b'... side end of small hole, 7,
7'... Cutting blade means, 8... Item to be packaged, 13... Heat shrink tunnel, 14... Shrink packaging body, 1
5, 15'... Cutting blade shape, 15a, 15a'... First blade part, 15b, 15b'... Second blade part.

Claims (1)

[Scope of Claims] 1. Each of the series of small through holes formed in the film of the Shrink packaging body has a corner in a portion close to the small through holes on both adjacent sides, and the corner of each small through hole 1. A shrink packaging body equipped with an easy-open means, characterized in that the lines connecting the two are arranged substantially linearly, and the small through holes are formed in a polygonal shape larger than a square, such as a substantially diamond shape. 2. Cutting blade means for forming a series of small incisions in a shrink film for packaging while supplying the film onto an object to be packaged; means for wrapping the object with the film; and a means for wrapping the object with the film; In the shrink packaging apparatus, the cutting blade means is formed by a series of cutting blade shapes, and the planar shape of each cutting blade shape is the same as that of the series of cutting blade shapes. A Shrink packaging device comprising: a first blade section that is aligned substantially in a line in the same direction as the arrangement direction; and a second blade section that intersects the first blade section.