JPH0230945B2 - - 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.

(Problems with conventional technology) Conventional easy-opening methods for Shrink packaging have generally included a method in which a tear tape is adhered to the packaging film, or a series of small holes formed in the packaging film itself. It is true.

However, when using tear tape, in addition to the cost of the tape itself, it requires an adhesive layer to bond the tape to the film and an adhesive device for this purpose, resulting in a considerable increase in overall cost. Tear tapes are thicker than packaging films because they require greater strength than packaging films, so when they are heat-treated for shrink packaging, the difference in heat shrinkage As a result, a difference in shrinkage occurs between the two, resulting in wrinkles in that part of the package.
There was a problem that the finish was poor.

Therefore, it has been considered desirable from the economical and finish standpoints 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 corners near the through holes, and lines connecting the corners of each through hole are arranged in a substantially straight line. Preferably, this small through hole is formed into a substantially triangular shape.

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 has a bent or curved line portion with both open ends, and the line portion forms an imaginary line connecting the two open ends. Both open ends of the series of cutting blade shapes are arranged in a substantially straight line without intersecting each other.
Preferably, the planar shape of this cutting blade shape is a substantially V-shape or the like with both ends widened.

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

FIG. 1 shows the entire shrink packaging device using horizontal pillow packaging according to an embodiment of the present invention, in which the shrink film is pulled out from the roll 2 and passes through guide rollers 3a, 3b, 3c to the bag making device section 4. Sent. A cutting roller 5 is arranged opposite to the intermediate guide roller 3b among these rollers, and the cutting roller 5 has a large number of small holes 6 for easy opening in the shrink film 1 as described later. Cutting means 7 are provided for forming the shrink film 1 on these rollers 3.
After passing between b and 5, a large number of cuts 7a are formed in a straight line across the lateral direction of the film 1. Items to be packaged 8 are sequentially fed into the bag making device section 4 from behind at predetermined intervals by a conveyor belt 9.
When the article 8 to be packaged enters the bag making device section 4, its upper and side parts are covered with the shrink 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, there is a vertical shaft 12 equipped with a pair of upper and lower horizontal seal cutter blades 11a, 11b.
a, 12b are disposed, 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 formed by a series of independent cutting blade shapes 15, and in the example shown in FIG. 2, the plane shape of each cutting blade shape 15 is approximately V-shaped. Both open ends 15a, 15b of the V-shaped notch blade 15 are arranged horizontally in line with both open ends 15a, 15b of the other V-shaped cutting blade 15. This cutting blade shape 15
The planar shape of is not limited to a V-shape, as long as both ends are widened, the center part may be curved instead of having an acute angle like a V-shape, and various shapes can be considered, but in short, This planar shape must have a bent or curved line portion with both ends forming open ends 15a and 15b, and this line portion must not intersect with an imaginary line connecting both open ends 15a and 15b. be. In this case as well, it is necessary that both open ends of the series of cutting blade shapes are arranged in a straight line.

The shrink film 1 having a large number of V-shaped cuts 7a formed by the V-shaped cutting blade 15 as described above wraps the packaged object 8 as explained in FIG. Sylink tunnel 13
When heat-shrinked inside, the small triangular film pieces between the V-shaped notches 7a shrink quickly and are drawn toward the open end of the V-shape, and as a result, the line connecting the open ends is defined as the base. Approximately triangular small holes 6 are formed, and a shrink package 14 according to the present invention as shown in FIG. 3 is obtained. In the Shrink package 14 shown in FIG. The line connecting 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 edge shape 15' is formed into a V-shape displaced by 90 degrees compared to the case of the first embodiment, and both open ends 15a', 15b' of this V-shape are It is arranged in a straight line in the circumferential direction with both open ends 15a', 15b' of the V-shaped cutting edge 15'. This cutting blade shape 1
Similarly to the first embodiment, the planar shape of 5' can be changed in various ways. 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. As shown in FIG. 5, the shrink package 14' formed by the apparatus of the second embodiment has each small hole 6' for easy opening formed in a substantially triangular shape, and both sides of the small hole 6' are formed in a substantially triangular shape. The ends 6a' and 6b' are acute corners, and the line connecting the opposite ends 6a' and 6b' of the series of small holes 6' is approximately a straight line along the longitudinal direction of the package. .

(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. Therefore, when the film parts on both sides of a series of small holes are pulled open, the film will easily begin to tear from the above corner, and the film will connect with the corners of the adjacent small holes in a straight line. is cut and opened. Therefore, 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 it in the conveying path of
b' has a bent or curved line portion forming an open end, and the line portion does not intersect with an imaginary line connecting both open ends, and both open ends of a series of cutting blade shapes are straight. It is only necessary to arrange them in the same manner, so the effect obtained is extremely large despite the relatively simple structure.

In particular, when the planar shape of the cutting blade is V-shaped, approximately triangular small through holes are formed in the film of the formed package. A small triangular piece of film is contracted and drawn to the bottom of the small hole, so
The film at this bottom portion is stronger than the film between adjacent small 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, 15b, 15
a', 15b'...Open end of cutting edge shape.

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 package with an easy-opening means, characterized in that lines connecting the two are arranged substantially linearly. 2. A shrink package with easy-open means according to claim 1, wherein the small through hole is formed in a substantially triangular shape. 3. Cutting blade means for forming a series of small incisions in the shrink film for packaging while supplying the film onto the 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 such that both ends thereof are open ends. It has a bent or curved line portion, the line portion does not intersect with an imaginary line connecting the two open ends, and the two open ends of the series of cutting blade shapes are arranged in a substantially straight line. Shrink packaging equipment featuring: 4. The Shrink packaging device according to claim 3, wherein the planar shape of the cutting blade shape is a substantially V-shape or the like with both ends widened.