JPH0564853A - Laminate sheet for packaging and its manufacture - Google Patents

Abstract

PURPOSE:To manufacture a laminate sheet for packaging to be formed as a closed bag having the position of easy openability not limited to the given position and without the necessity of conforming the directional properties of strength of a packaging material to the running direction of torn channels formed for the purpose of getting easy openability. CONSTITUTION:A laminate sheet 1 for packaging provided with a a substrate 2 composed of a thermoplastic resin film having a fragile area composed of a number of torn channels 4 and a thermoplastic resin layer 5 press laminated on the substrate 2 is manufactured in the subject method.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging laminated sheet which is formed into a closed bag which is used for enclosing various kinds of internal fillers.

[0002]

2. Description of the Related Art A sealed bag made of a thermoplastic synthetic resin film or a laminated sheet in which the film is laminated with paper, aluminum or the like has various types because of its simplicity because the sealing portion of the sealed bag can be formed by heat welding. It is used to enclose foods, medicines, seasonings, etc. In order to make it easy to open when taking out the inner filler in this sealed bag,
It is commonly used to form an I-notch or V-notch on one part of the heat-sealed portion of a sealed bag and use this as a trigger for opening the sealed bag. Sealing with this I-notch or V-notch The bag has drawbacks such as generation of notch scraps in the manufacturing process, and if the position of the notch is displaced, the hermeticity of the hermetic bag is impaired. Therefore, as a method of eliminating the above-mentioned drawbacks caused by the I-notch and the V-notch, an easily tearable bag is formed by forming an elongated tear groove substantially perpendicular to the edge of the heat-sealed portion forming the edge of the sealed bag. A closed bag having characteristics has been proposed (Japanese Patent Laid-Open No. 61-142159).

[0003]

SUMMARY OF THE INVENTION A hermetically sealed bag having an elongated tear groove formed substantially at a right angle to the edge of the heat-sealed portion forming the edge of the hermetically sealed bag is provided when the hermetically sealed bag is opened. Breaking is limited to a direction substantially perpendicular to the edge of the closed bag. Therefore, when the direction of the packaging material used for the closed bag and the direction of breakage at the time of opening the closed bag can be easily opened, the length direction of the heat-sealed portion of the closed bag, That is,
Since it is impossible to break in the direction along the edge of the sealed bag,
It has the complexity that the direction of the strength of the packaging material and the direction of the elongated tear groove must be aligned. In addition, the wound material of the packaging material before being secondarily processed into the closed bag does not have an organized winding shape due to burrs due to the elongated tear grooves formed on the packaging material, and is likely to collapse. It also has the drawback. On the other hand, the present invention provides a sealed bag in which the easy-open position is not limited to a predetermined specific position, and the strength direction of the packaging material and the running direction of the tear groove are matched. (EN) Provided is a packaging laminated sheet which is unnecessary and has no problem of burrs due to a tear groove, and a manufacturing method thereof.

[0004]

According to a first aspect of the present invention, there is provided a support base material made of a thermoplastic resin film in which a fragile region composed of a large number of tear groove groups is formed, and pressure-laminated to the support base material. A laminated sheet for packaging having a laminated structure including a thermoplastic resin layer. The second aspect of the present invention is to form a fragile region composed of a large number of tear groove groups in a predetermined range of a supporting base material made of a thermoplastic resin film, and then apply a thermoplastic resin layer to the supporting base material, By pressing between the pair of nip rolls, the supporting base material and the thermoplastic resin layer are laminated to obtain a laminated sheet for packaging. A third aspect of the present invention is to form a fragile region composed of a large number of tear groove groups in a predetermined range of a supporting base material made of a thermoplastic resin film, and then to form a thermoplastic resin layer above and below the supporting base material, respectively. And a thermoplastic resin layer are laminated by pressing between a pair of nip rolls to obtain a packaging laminated sheet.

In the packaging laminated sheet and the method for producing the same according to the present invention having the above-mentioned structure, the supporting base material made of a thermoplastic resin film is, for example, a polyolefin resin film, a thermoplastic polyester resin film, a nylon film, or polyvinyl chloride. In addition to a resin film, a thermoplastic resin film having a metal vapor deposition layer is used.

A large number of tear groove groups formed on the support substrate made of the thermoplastic resin film are, for example, U-shaped, + -shaped, -shaped, V-shaped, l-shaped, and the like. These may be inverted or overturned shapes, and the shape of a single laceration groove may not necessarily be the same, and laceration grooves of two or more types may be mixed. .. These numerous tear groove groups are formed so as to penetrate from the front surface to the back surface of the supporting substrate.

A large number of tear groove groups in a supporting substrate made of a thermoplastic resin film can be easily formed by using a tool in which a saw-toothed cutter is combined with the circumferential surface of a metal roll or the flat surface of a metal plate. Formed in. It should be noted that this processing machine may be installed together with a printing machine for makeup processing on a supporting base material made of a thermoplastic resin film, or a large number of tear grooves may be formed at predetermined locations on the supporting base material made of a thermoplastic resin film. After forming a brittle region consisting of a group, an extrusion extrusion coater when laminating an extruded resin layer of a thermoplastic resin on the supporting base material, or when attaching a thermoplastic resin film to the supporting base material It may be attached to the laminator of.

The formation region of a large number of tear groove groups formed on a supporting base material made of a thermoplastic resin film is different depending on the entire material and thickness of the packaging laminated sheet, but generally, When a three-way sealed bag with a rectangular laminated packaging sheet is formed, the folding line of the laminated packaging sheet is formed in a fragile region composed of band-shaped tear grooves. Is preferred. However, the formation region of a large number of laceration groove groups formed on the support base material is not necessarily limited to the band-like region, and may be formed at any position when formed into a closed bag, for example, a circle or a rectangle. , May be formed so as to form a spot-shaped region such as a prism. When a fragile area, which is a formation area of a laceration groove group, is formed so as to form a spot-shaped area such as a circle, a rectangle, or a square, it may be used as a trigger for opening the hermetically sealed bag by the laminated sheet for packaging. The vulnerable area is utilized and the sealing bag is opened by applying a little fingertip force to this fragile area.

The plurality of laceration grooves are preferably formed in a checkerboard pattern rather than the laceration grooves being arranged in parallel. Further, in the case where a large number of laceration grooves formed in the supporting base material are U-shaped, for example, in [FIG. 2], A ... 0.3 to 2 mm,
B ... 0.1-1 mm, C ... 0.6-4 mm, D ...
It is preferable to form it to about 1.2 to 3 mm.

The thermoplastic resin layer press-laminated on a supporting base material made of a thermoplastic resin film in which a fragile region composed of a large number of tear groove groups is formed, and the thermoplastic resin layer is formed in a pair after extrusion coating. It is formed by passing between nip rolls of No. 1 or by passing between a pair of nip rolls after adhering another thermoplastic resin film.

[0011]

The laminated sheet for packaging of the present invention having the above-mentioned constitution is usually cut into a substantially rectangular shape and molded into a hermetically sealed bag. By locating the easily openable region by the fragile region composed of a large number of tear groove groups, the vulnerable region is used as a trigger for opening the sealed bag. Therefore, the sealed bag obtained by using the packaging laminated sheet of the present invention,
By applying a small force to the fingertip, the fragile region of the supporting base material in the packaging laminated sheet is used as a trigger to form an easily openable closed bag.

Further, in the laminated sheet for packaging of the present invention, the deterioration of the barrier property due to the tear groove group relating to the easy-opening property of the closed bag by the laminated sheet is completely compensated by the pressure lamination of the thermoplastic resin layer. Therefore, the storage performance of the internal filler does not deteriorate due to the tear groove group, and
The formation region of the tear groove group is not limited.

Further, the packaging laminated sheet of the present invention has a supporting base material made of a thermoplastic resin film within a predetermined range.
Since the extruded resin layer of the thermoplastic resin is laminated on the supporting base material after forming the fragile region composed of a large number of laceration groove groups, burrs are generated due to the formation of the large number of laceration grooves. To flatten when forming the thermoplastic resin layer that is pressed and laminated on the roll, when winding a long packaging laminated sheet, winding collapse caused by numerous U-shaped or + -shaped tear grooves It is possible to obtain a well-ordered roll with no winding.

[0014]

EXAMPLES The concrete constitutions of the packaging laminated sheet and the method for producing the same of the present invention will be described below based on examples. Example 1 A support base material 2 having a 12 μm-thickness polyethylene terephthalate film on which the back surface is printed and decoratively treated, 5 sets of upper blades having 6 sets of saw blades and rubber having a hardness of 80 After passing through a laceration groove processing device equipped with a lower body made of rollers, a group of U-shaped laceration grooves 4 in the combination shown in [Fig. 2] is displayed in a region 3 indicated by diagonal lines in [Fig. 3]. The support substrate 2 was formed from the back surface (printing and decorative surface) side. The size and spacing of the laceration grooves 4 are as shown in [Fig. 2] A ... 500μ, B ... 300μ, C ... 1mm,
D: Set to 1.5 mm, and the width of area 2 is 5.0
It was set to mm.

Next, as shown in FIG. 1, after the urethane-based anchor coating agent is applied to the back surface of the supporting substrate 2, an extruded resin layer 5 of low-density polyethylene resin having a thickness of 15 μ is formed. A 7 μm thick soft aluminum foil 6 was laminated on the extruded resin layer 5 surface of the density polyethylene resin. Then, after applying a urethane-based anchor coating agent on the soft aluminum foil 6 side, a thickness of 30
By forming a heat sealant layer consisting of an extruded resin layer 7 of μ low density polyethylene resin and pressing them between a pair of nip rolls, a width 70
A 0 mm laminated sheet for packaging was obtained.

Manufacture of airtight bag A laminated sheet 1 for packaging having a width of 700 mm is sequentially cut from an edge 8 to a width of 140 mm and a length of 210 mm.
After cutting into a rectangular laminated sheet of 140 mm × 210, the laminated sheet is pressed and bent along the center line 9 of the region 3 of the U-shaped tear groove group 4 and other than this bending line. By forming the heat-welded portion 10 in the width of the three-sided edge portion of 10 mm, a three-sided sealed bag indicated by reference numeral 11 in FIG. 4 was obtained.

When the obtained hermetically sealed bag 11 was opened along the fold lines other than the three-sided seal portion of the hermetically sealed bag, the breaking step along the fold line was remarkably achieved by applying a slight force to the fingertip. It was easy to do. Also,
In the hermetically sealed bag 11, the deterioration of the barrier property due to the tear groove group 4 relating to the easy-opening property is completely compensated by the presence of the extruded resin layer 5 of the low-density polyethylene resin, and the storage performance of the filling material is the tear groove. It does not decrease with the four groups, and a good action is exhibited in storage performance.

In the above examples, the tear groove group in the supporting base material of the packaging laminated sheet was formed in a band shape, but the formation region of the tear groove group may be rectangular, circular, square, or the like. When the laminated sheet for use is made into a closed bag, the region where the tear groove group is formed may be at any position of the closed bag.

Example 2 A supporting substrate made of a 12 μm-thick polyethylene terephthalate film having a vapor-deposited layer of aluminum formed thereon, and five sets of upper blades each having six sawtooth-shaped cutting blades. Pass through a tear groove processing device to which a lower body made of a rubber roller having a hardness of 80 is attached, and as in Example 1, [FIG. 3]
In the region 3 indicated by diagonal lines, the group of U-shaped tear grooves 4 formed by the combination shown in FIG. 2 was formed from the back surface (non-deposited layer surface) side of the supporting substrate.

Then, a polyethylene terephthalate film having a thickness of 12 μ is laminated on the aluminum vapor-deposited layer surface of the support substrate via an extruded resin layer of a low-density polyethylene resin having a thickness of 15 μ, and the non-vapor deposition of the support substrate is performed. A low-density polyethylene resin having a thickness of 50 μ is brought into contact with the layer surface through an extruded resin layer of a low-density polyethylene resin having a thickness of 15 μ, and further, these are pressed between a pair of nip rolls to obtain a target packaging. A laminated sheet for use was obtained.

[0021]

The laminated sheet for packaging according to the first aspect of the present invention is a laminated sheet for packaging comprising a supporting base material made of a thermoplastic resin film and a thermoplastic resin layer laminated on the supporting base material under pressure. And a fragile region due to a large number of tear groove groups is formed on the supporting base material. In a sealed bag obtained by such a packaging laminated sheet, the region of a large number of tear groove groups formed in the supporting base material of the packaging laminated sheet is a fragile region, and therefore the sealing is triggered by the region. The bag has a good easy opening property.

In the second and third aspects of the present invention, after forming a fragile region composed of a large number of tear groove groups in a predetermined range of a supporting base material made of a thermoplastic resin film, the supporting base material is made of a thermoplastic material. It consists of pressing and laminating resin layers.
The laminated sheet for packaging of the invention can be obtained easily and surely.

[Brief description of drawings]

FIG. 1 is a cross-sectional view schematically showing an example of a laminated sheet for packaging of the present invention.

FIG. 2 is an explanatory view showing a good arrangement state of tear grooves formed on a supporting base material in a packaging laminated sheet.

FIG. 3 is an explanatory diagram illustrating a region where a tear groove is formed in a supporting base material in a packaging laminated sheet.

FIG. 4 is a front view showing an example of a hermetically sealed bag made of a laminated packaging sheet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Laminated sheet for packaging 2 Support base material which consists of a thermoplastic resin film 3 Area | region (fragile area | region) of 4 groups of laceration grooves 4 laceration groove 5 Thermoplastic resin layer press-laminated to the support base material 11 Three-way seal airtight bag

Claims (3)

[Claims] 1. A support base material comprising a thermoplastic resin film in which a fragile region composed of a large number of tear groove groups is formed, and a thermoplastic resin layer press-laminated to the support base material. Characteristic laminated sheet for packaging. 2. A fragile region consisting of a large number of tear groove groups is formed in a predetermined area of a supporting base material composed of a thermoplastic resin film, and then a thermoplastic resin layer is abutted on the supporting base material,
A method for producing a laminated sheet for packaging, comprising laminating a supporting base material and a thermoplastic resin layer by pressing between a pair of nip rolls. 3. A vulnerable region composed of a large number of tear groove groups is formed in a predetermined range of a supporting base material made of a thermoplastic resin film, and then a thermoplastic resin layer is contacted with each of the upper and lower parts of the supporting base material. A method for producing a laminated sheet for packaging, comprising laminating a supporting base material and a thermoplastic resin layer by pressing between a pair of nip rolls.