JP3511658B2 - Manufacturing method of easy-open packaging material - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an easy-open packaging material in which a free-form line is formed on a plastic film with a conductive ink and an opening or a half-cut line is provided in the conductive ink portion. It is a thing.

[0002]

2. Description of the Related Art In recent years, for example, a bag containing soy sauce or sauce liquid or powdered seasoning attached to bento boxes, instant noodles, etc., or dried condiments as contents is
Generally, the above-mentioned contents are contained in a bag body formed by heat-sealing a thermoplastic film and attached in the form of a pouch.

Removal of the contents from these storage bags is usually done by at least one of the heat-sealed portions of the storage bags.
A V-shaped or linear cutout or slit is provided at a location, and the bag body is torn and opened from this cutout or slit to take out the contents. The method for opening these storage bags is almost the same for packaging bags that store solid foods such as confectionery and the like.

[0004]

However, these notches and slits are generally formed during the enclosing work for containing the contents in the containing bag. Therefore,
When manufacturing the storage bag, the user side of the plastic film must be provided with a special notch means or slit means that operates in synchronization with the heat-sealing machine of the bag-making device. There is a problem that equipment cost and running cost of the device increase.

Therefore, it is not necessary for the user of the plastic film to prepare notch means, slit means, and other auxiliary equipment, and a new plastic film which can easily open the accommodating bag. Is strongly requested.

In view of the above, the present invention forms perforations, half-cut lines, etc., which are free-form lines, by printing conductive ink on a transparent plastic film, and opens or half-cuts by electron beam or electric discharge treatment. It is intended to provide a method for producing an easy-open packaging material that can be provided with lines and the like.

[0007]

In order to achieve the above object, the present invention provides a conductive ink comprising a transparent plastic film and at least one surface thereof, which is prepared by adding a conductive material to a printing ink and mixing the conductive ink. A free-form line characterized by forming a free-form line at a predetermined position, subjecting the plastic film to an electron beam or electric discharge treatment to melt the free-form line portion and providing an opening or a half-cut line. It is a manufacturing method of a packaging material.

The free-form line is characterized by being formed by one or both of a solid line and a dotted line consisting of a straight line or a curved line.

Further, the conductive ink is obtained by adding a single or a plurality of conductive materials such as metal powder or a paste thereof, metal oxide, carbon black, acetylene black, and a surfactant to the printing ink. It is characterized by.

[0010]

The easily-openable packaging material of the present invention is a transparent plastic film printed with a conductive ink obtained by adding a conductive material to a printing ink and printing the same. Free-form lines such as half-cut lines can be formed, and the film is melted by electron beam or electric discharge treatment to the plastic film on which the free-form lines are formed, and the free-form fine holes and half-cuts are automatically formed. , Perforations can be provided.

[0011]

The present invention will be described in detail. The transparent plastic film according to the present invention may be either a thermoplastic plastic film or a thermosetting plastic film. The thickness of these films is 6 μm to 20 μm.
A range of m is suitable.

The free-form lines formed on this film are solid lines and dotted lines printed with conductive ink to form perforation lines and half-cut lines for making the film easy to break. In addition, any of these shapes such as a linear shape and a curved shape can be freely formed by printing.

The conductive ink used for this printing includes any one or a plurality of conductive inks such as a metal powder of aluminum or the like or a paste thereof, a metal oxide, carbon black, acetylene black, an organic electrolyte type surfactant, etc. It is obtained by adding and mixing the conductive material in the range of 5% by weight to 30% by weight. Printing using this conductive ink may be a clavia printing method, a screen printing method, or an offset printing method, and the printing method is selected according to the thickness of the film and the required printing film thickness to be formed on the film. For example, screen printing is suitable when a thick film thickness is required, and gravure printing or offset printing is suitable when a thin film is desired. However, when used for food packaging, it is necessary to use a conductive material that does not conflict with the Food Sanitation Law among these.

When the packaging material on which the free-form line is printed is used for a package of frozen food, retort food, etc.,
It is also possible to cause the conductive ink to generate heat by melting the film by electron beam radiation from a microwave oven to open the film. Also, when used as a general packaging material,
A free-form line such as perforations is melted by resistance heat due to electric discharge (corona discharge, etc.) to form holes or half-cut lines. Therefore, perforations are pre-opened on a wide, long plastic film. Perforations are possible.

It is also possible to print different free-form lines such as a half-cut line and a perforation line on the front surface or the back surface of this transparent plastic film, and simultaneously open the half-cut line and the perforation line. Furthermore, a free-form line is formed on the back surface of the plastic film with conductive ink,
Also in the packaging material in which the plastic film is laminated on the back surface, it is possible to melt and open the film by radiation such as an electron beam.

Example 1 FIG. 1 is a cross-sectional explanatory view of a film in which a straight line is printed on a transparent plastic film with a conductive ink and a half cut is formed by electric discharge in an example of the present invention. . A PET film 10 having a thickness of 10 μm is used as a transparent plastic film, and a width of 80 μm to 100 μm and a thickness of 1 are formed on the upper surface thereof.
A solid line was printed with conductive ink 11 in which 10% by weight of aluminum metal paste was added and mixed to 0 μm. After drying, the film was placed in an electric discharge (corona discharge) treatment machine for 20
Passage was at a rate of ~ 30 / min. As a result, the half-cut line H having a depth of about 5 μm to 7 μm could be provided on the portion where the conductive ink was printed. Similar half-cut lines were obtained when printed on the back surface of the film in the same manner as above (FIG. 1C).

<Embodiment 2> FIG. 2 is a sectional explanatory view showing a state in which perforation lines are printed with a conductive ink on a transparent plastic film in another embodiment of the present invention and the film is opened by electric discharge. is there. A conductive ink was used in the same manner as in Example 1 to form a film having a width of 80 μm to 100 μm on the film.
A film is formed by forming a perforation line with a thickness of 15 μm and a length of 3 mm at one point by gravure printing, and passing the surface through an electric discharge (corona discharge) treatment machine at a speed of 20 to 30 / min. Is perforated by melting and penetrating. Similar perforations were obtained when printed on the back surface of the film in the same manner as above (FIG. 2C).

Example 3 FIG. 3 is a sectional view (A) of a film in which spots are printed on the inner surface of the laminated film with a conductive ink, and a sectional explanatory view of the laminated film melted and opened by electric discharge. (B). 16μm thick PET
A conductive ink 11 similar to that used in Example 1 was used to perform spot printing on the back surface of the film 10 in a substantially square shape having a thickness of 20 μm and a side of about 2 mm, and a polyethylene film 10a having a thickness of 20 μm was formed from the back surface. The laminated film dry-laminated via the adhesive 12 was allowed to pass through the corona discharge treatment device at a speed of 20 to 30 / min, and spot holes G penetrating the laminated film could be automatically provided.

[0019]

EFFECTS OF THE INVENTION The easy-open packaging material of the present invention is a spot for fine pores, which cannot be obtained by printing using a conductive ink obtained by adding a conductive material to a printing ink on a transparent plastic film. Free-form lines such as perforation lines and half-cut lines can be formed, and the film is automatically melted by electron beam or electric discharge treatment to the plastic film on which this free-form line is formed.
Free-form openings, half cuts, and perforations can be provided.

Further, the easy-open packaging material of the present invention can form a free-form line having a shape different from a half-cut line, a perforation line, and a spot for a fine hole on a film, and further, an electron beam or an electric discharge. A half cut or an opening can be automatically provided by the (corona discharge) treatment.

[Brief description of drawings]

FIG. 1 is a perspective view (A) of a film in which a solid line is printed with a conductive ink on a transparent plastic film according to an embodiment of the present invention, a TT cross-sectional view thereof (B), and a conductive ink on the back surface. FIG. 3C is a cross-sectional view of the case of printing (C) and a cross-sectional explanatory view (D) of the film showing a state in which a half cut is provided by electric discharge.

FIG. 2 is a perspective view (A) of a film obtained by printing perforation lines with a conductive ink on a transparent plastic film according to another embodiment of the present invention, a TT cross-sectional view thereof (B), and a conductive surface on the back surface. It is sectional drawing (C) at the time of printing ink, and sectional explanatory drawing (D) of the film opened by electric discharge.

FIG. 3 is a cross-sectional view (A) of a film in which spots are printed with a conductive ink on the inner surface of the laminated film, and a cross-sectional explanatory view (B) of the laminated film melted and opened by electric discharge.

[Explanation of symbols]

10 ... PET film 10a ... polyethylene film 11 ... Conductive ink 12 ... Adhesive H ... Half cut line G ... Through holes such as perforations

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ identification code FI C08J 7/04 C08J 7/04 D (58) Fields investigated (Int.Cl. ⁷ , DB name) B65D 65/26-65 / 36 B65D 33/00 B31B 1/76 321 B32B 15/08 C08J 7/00 305 C08J 7/04

Claims (3)

(57) [Claims] 1. A free-form line is formed at a predetermined position on the plastic film by using a conductive ink prepared by adding a conductive material to a printing ink and mixing it on at least one surface of a transparent plastic film. A method for producing an easily openable packaging material, which comprises subjecting an electrically conductive ink portion to an opening or a half-cut wire by performing an electron beam or electric discharge treatment. 2. The easy-open packaging material according to claim 1, wherein the free-form line formed by the conductive ink is formed by one or both of a solid line consisting of a straight line or a curved line and a dotted line. Manufacturing method. 3. The conductive ink comprises a printing ink, and one or more conductive materials such as metal powder or a paste thereof, metal oxide, carbon black, acetylene black, and a surfactant are added and mixed. The method for producing the easy-open packaging material according to claim 1 or 2, characterized in that.