JPH07195528A - Superposed structure of resin film and sheet like member and formation of small hole in resin film - Google Patents

Abstract

PURPOSE:To facilitate the peeling of a sheet like member when the sheet like member is superposed on the resin film. CONSTITUTION:A large number of small holes 11 are formed to the superposed part of the resin film 3 and a sheet like member 4 by thrusting heated needle like members in the resin film to melt the resin film by the heat radiated from the needle like members.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a superposing structure for facilitating peeling of sheet-like members superposed on a resin film, and a method for forming small holes in the resin film in such a structure.

[0002]

2. Description of the Related Art Generally, a peelable sheet-like member is often overlaid on a resin film. For example, a pack film that covers the opening of a container when selling fruits or the like over the counter is disclosed in Japanese Utility Model Publication No. 1-36775, and in this pack film, a covering piece that is a resin film has a sheet-like member. The fold-back pieces are stacked.

[0003]

By the way, when it is desired to peel the sheet-shaped member from the resin film, if these are closely attached, it may not be easily peeled. Therefore, it is an object of the present invention to facilitate peeling of a sheet-shaped member that is laminated on a resin film.

[0004]

In order to achieve the above object, the present invention takes the following technical means. That is,
The overlapping structure of the resin film and the sheet-like member of the present invention is characterized in that a small hole is formed in the overlapping portion of the resin film with the sheet-like member.

The small holes of the resin film are preferably formed by approaching or sticking a heated needle-shaped member on the surface of the resin film and melting a part of the resin film by the heat radiated from the needle-shaped member. . In the present specification, the sheet-shaped member includes a piece of paper, a resin or metal film, a resin or metal sheet, or the like.

[0006]

The air easily flows between the resin film and the sheet-shaped member through the small hole formed in the portion where the resin film and the sheet-shaped member are overlapped with each other, and therefore, the peeling easily occurs. If the resin film is melted by the heated needle-shaped member to form a small hole, the inner peripheral edge of this small hole becomes thicker than the resin film and unevenness is formed on the surface of the resin film. The adhesiveness with the strip-shaped member is deteriorated, so that the peeling is further facilitated.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. The pack film 1 shown in FIGS. 1 to 3 is a transparent resin film for covering the opening of a container when selling fruits and vegetables such as strawberries and grapes over the counter.
A cover piece 3 made of polystyrene or polypropylene formed into a film by uniaxial stretching or biaxial stretching, covering the opening of the container 2, and a short folding piece 4 provided at one end 3a of the coating piece 3, Both sides of the folded piece 4 are heat-welded to the covering piece 3 to form a bag portion 5. The length of the folding piece 4 is long enough to extend to the bottom of the container 2 when mounted on the container 2 in the present embodiment, but long enough to be locked to the opening edge 2a of the container 2. If there is a gap The width H of the folded portion 6 of the folded piece 4 is equal to that of the container 2
Is substantially equal to the width of the opening edge portion 2a. And
The covering piece 3 and the folded piece 4 are gradually widened from the folded portion 6 side of the folded piece 4 toward the free end portion 7 side, and the covering piece 3 is widened from the free end portion 7 side of the folded piece 4. The width is gradually narrowed toward the other end 3b of the covering piece 3, and the other end 3b of the covering piece 3 is made substantially equal in width to the opening edge portion 2a of the container 2.

Therefore, when the bag portion 5 is covered on one end side of the container 2 as shown in FIG. 3 and the covering piece 3 is covered on the opening portion of the container 2, the widened portion of the covering piece 3 (in FIG. 2). (The part surrounded by the one-dot chain line) is folded downward, and even the side of the container 2 is covered, and the side of the opening of the container 2 is opened even when the covering piece 3 is in a raised state. Prevent. In particular, it is effective when the container 2 is tilted up and displayed in a store, and it is possible to prevent fruits such as strawberries and grapes in the container 2 from overflowing. In addition, the corner portions 6a on both the left and right sides of the folded portion 6
Is chamfered corresponding to the corner portion of the opening edge portion 2 a of the container 2.

The covering piece 3 has a large number of small holes 11 in an appropriate range.
Are formed, the air permeability can be secured, and the freshness of the fruits and the like in the container 2 can be maintained. A product name, a place of origin, a trademark, a bar code, or the like is printed on a portion where the small hole 11 is not formed. The small hole 11 is formed by piercing the covering piece 3 with a needle-shaped member heated to a temperature at which the resin film melts, and melting the resin film by heat. Therefore, the inner peripheral edge portion 12 of the small hole 11 is formed as shown in FIG. As shown in, the film is heat-shrinked and is thicker than the resin film. Alternatively, the small hole 11 may be formed by heating the needle-shaped member in a state where the needle-shaped member is close to the surface of the covering piece 3 and melting the resin film by the heat radiated. In addition, the needle-shaped member may be solid or injection needle-shaped (hollow).
Can be used.

A large number of small holes 11 are also formed in the overlapping portion L of the covering piece 3 and the folded piece 4. The covering piece 3 and the folded piece 4 are often in close contact with each other before use and may be difficult to peel off during use. However, if the small hole 11 is formed in the overlapping portion in this way, the covering piece 3 Air easily flows in between the folded-back piece 3 and the folded piece 4, and therefore peeling-off is also facilitated. Furthermore, if the small holes 11 are formed as described above, the inner peripheral edge portion 12 of the small holes 11 will form irregularities on the surface of the resin film, so that the covering piece 3 and the folded piece 4 adhere to each other. The property deteriorates and the peeling becomes easier.

The other end 3b of the covering piece 3 is provided with an extension piece 8 extending to the peripheral surface of the container 2. The edge of the single-sided adhesive tape 9 is attached to the free end edge of the extension piece 8 from the upper surface side, and the release paper 10 is attached to the adhesive surface of the adhesive tape 9 from the lower surface side.
Is peelably attached. The release paper 10 has substantially the same size and width as the adhesive tape 9, and one edge has an extension piece 8
When the release paper 10 is peeled off, it is easy to peel it off from this overlapping portion. Further, if the plurality of small holes 11 as described above are formed in the overlapping portion of the extension piece 8 with the release paper 10, the release paper 10 can be further easily peeled.

In this embodiment, the covering piece 3 which is a resin film is used.
It is easy to peel off the folded piece 4 which is a sheet-shaped member, and the extension piece 8 which is a resin film and the release paper 10 which is a sheet-shaped member. In the production of the pack film 1, for example, as shown in FIG. 5, first, the folded piece 4 of the pack film 1 is conveyed while the strip film 20 is conveyed in the strip longitudinal direction.
In order to form the strip-shaped film 20, one end edge portion in the width direction of the strip-shaped film 20 is folded back to the back surface side, and the folded-back piece forming portion 21 is overlapped with the covering piece forming portion 22.
The pressure-sensitive adhesive tape 9 is adhered to the other edge portion in the width direction from the front surface side, and the release paper 10 is attached to the adhesive tape 9 from the rear surface side.

After printing the product name and the like in the printing step 14, a large number of small holes 11 are formed in an appropriate range in the small hole forming step 15. Then, the strip film 2
0 is cut by the cutting blade 23 together with the adhesive tape 9 and the release paper 10. The cutting blade 23 cuts the pack film 1
Cutters bent in a substantially V shape in accordance with the side edge shape are arranged in a back-to-back shape, and are heated to a temperature at which the resin film melts by an appropriate heating means, and are cut out from the band-shaped film 20. One side edge of each of the two pack films 1 adjacent in the longitudinal direction is cut at the same time.

Therefore, if the strip-shaped film 20 is once cut by the cutting blade 23 at the longitudinal end portion of the strip-shaped film 20, the strip-shaped film 20 is conveyed by a predetermined amount in the strip longitudinal direction, and then cut again by the cutting blade 23, a predetermined width is obtained. Pack film 1
Is obtained, and by repeating this, the strip film 20 is obtained.
It is possible to manufacture a plurality of pack films 1. The pack films 1 having different widths can be easily manufactured by adjusting the transport amount of the strip film 20.

Further, when cut, the edge portion of the resin film is in a state of contracting due to heat, so that it can be made strong against breakage. Further, simultaneously with cutting, the edges of the covering piece forming portion 22 and the folded piece forming portion 21 are welded by the heat of the cutting blade. Therefore, it is not necessary to separately provide the cutting process and the welding process, and the process can be simplified.

The present invention is not limited to the above-mentioned embodiments, but can be adopted in various types of resin film and sheet-shaped member superposed structures. For example, it can be used in vinyl envelopes and various packaging films.

[0017]

As described above, according to the present invention,
The sheet-shaped member laminated on the resin film can be easily peeled off.

[Brief description of drawings]

FIG. 1 is a plan view of a pack film.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a side view showing a usage state of the pack film.

FIG. 4 is an enlarged sectional view of a small hole.

FIG. 5 is a schematic explanatory diagram of a method for manufacturing a pack film.

FIG. 6 is a cross-sectional view showing a cutting blade and a cutting blade mount.

[Explanation of symbols]

 3 Cover Piece (Resin Film) 4 Folding Piece (Sheet Member) 8 Extension Piece (Resin Film) 10 Release Paper (Sheet Member) 11 Small Hole

Claims (2)

[Claims] 1. A superposed structure of a resin film and a sheet-shaped member, wherein a large number of small holes are formed in a superposed portion of the resin film and the sheet-shaped member. 2. A resin film characterized by forming a small hole by approaching or piercing a heated needle-shaped member on the surface of the resin film and melting the resin film by the heat radiated from the needle-shaped member. Method for forming small holes in.