JP2560537Y2 - Laminating film for packaging bag - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging bag laminate film used for making a packaging bag that can be easily opened. [0002] A generally used composite film obtained by laminating a polyethylene film on cellophane, paper or the like can easily open the heat-sealing surface of the formed packaging bag by hand without using a cutter. Although its use is wide-ranging, this type of composite film for packaging bags has a low breaking strength and, in particular, lacks moisture-proof properties, so that the contents to be enclosed are limited. [0003] Therefore, a laminate film for packaging bags has been developed which uses a plastic film as a raw material and has an improved breaking strength and improved moisture proofness. However, since the plastic laminate film has a high tear strength, it is difficult to open the sealing portion of the formed packaging bag by hand, and a jig such as a cutter is required at the time of opening, so that the plastic bag can be easily opened by hand. A packaging bag has been demanded by users, and a packaging bag has been manufactured in which a V-shaped notch or an I-shaped notch is provided on the heat sealing surface so that the heat sealing surface can be easily opened. [0005] As described above, in a packaging bag made of a plastic laminate film, if a V-shaped notch or the like is provided on the sealing surface, the sealing surface can be easily opened. The notch processing can be easily performed when the packaging bag processing product is delivered by the packaging material processing manufacturer, but when the packaging material manufacturer delivers the rolled packaging material, Since it is packed by a filling machine, it is difficult to perform notch processing on the heat seal surface. In view of the above, there has been proposed a packaging bag laminate film in which a narrow opening rough surface is provided at a position corresponding to a bent portion of a packaging bag on which a plastic laminate film is to be formed, so that the packaging bag can be easily opened. However, in this case, since the width of the opening rough surface is narrow, it is difficult to accurately position the opening rough surface on the bent portion of the formed packaging bag. [0007] If the width of the opening rough surface is widened to solve this problem, many parts having weak strength are formed in the packaging bag and the barrier property is lacking, which is not preferable. The present invention has been made in view of the above-mentioned point, and has a small-diameter rough surface portion row spaced apart in the folding line direction at the bent portion of the packaging bag to be formed and the folding line is inclined. It is an object of the present invention to provide a packaging bag laminate film which is provided in a direction crossing the packaging bag and which can easily open the formed packaging bag at a bending position different from the heat sealing surface. [0009] The laminated film for packaging bags of the present invention is located on one side of the plastic laminated film in the plastic laminated film for packaging bags formed by laminating a plurality of plastic films. A rough opening surface having a predetermined width is provided at a position corresponding to the bent portion located at the side end of the packaging bag where the plastic film is to be formed, and the rough opening surface is spaced apart in the direction in which the folding line extends. And formed by a plurality of rows of small-diameter rough surface rows provided in a direction crossing the bending line at an angle,
Each small-diameter rough surface portion is formed of a flaw formed in the plastic film and a plastic material filled in the flaw. In the packaging bag laminate film of the present invention, the opening rough surface provided at the position corresponding to the bent portion of the packaging bag to be formed has a narrow width and a slanted bending line. As a result, the opening rough surface area becomes wide as a whole, and the opening rough surface area does not deviate from the bent portion of the packaging bag. And can easily be opened at the bent portion by hand. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an example in which the laminated film for a packaging bag according to the present invention is applied to a so-called pillow bag 1 having an end 1a protruding outward at the center on one surface. In this case, a cutting direction for opening is used. A rough surface 4 for opening is formed on the front side plastic film located at the bent portion 2 which is mountain-folded with respect to the arrow (arrow), and the surface located at the bent portion 3 which is mountain-folded with respect to the cutting direction of the end protruding outward. Opening rough surfaces 5 are formed on the side plastic films, respectively. That is, as shown in FIG. 2, the packaging bag material 6 cut to make the pillow bag 1 shown in FIG. 1 is one of the folding lines 7 and 8 forming the overlapping ends 1a and 1a. The rough surface 5 for opening is formed on one bending line 8 of
The rough opening surface 4 is formed on the bending line 9 on the side away from the bending line 8 on which the rough opening surface 5 is formed, of the bending lines 9 forming the both sides. The packaging bag laminate film 10 comprises:
As shown in FIG. 3, a 12 μm thick polyester film 12 having a rough opening portion 11 on one side and a printed surface formed on the other side, a polyethylene film 13 having a thickness of 15 μm, and an aluminum foil 14 having a thickness of 7 μm. And a 30 .mu.m thick polyethylene film 15 is extruded and laminated. The opening rough surface is formed by, for example, laser or ultrasonic waves. On the other hand, the rough opening portion 11 formed on the polyester film 12 has a shape as shown in FIG.
The small-diameter rough surface portion row 16 (narrow width h) is provided at a distance in the direction of the bending line L and in a direction crossing the bending line L in an inclined manner. A wide width H is formed around L as a whole. That is, the rough opening portion 11 formed on the polyester film 12 is
When a laminated film including No. 2 is formed, the position does not deviate from the position corresponding to the bending line L of the laminated film as a whole. The scratches on the opening rough surface portion 11 of the polyester film 12 are filled with a polyethylene material during extrusion lamination and present a smooth surface so that the appearance is not unsightly. In order to produce the pillow bag 1 using the packaging bag material 6 shown in FIG. 2, the joining end is heat-sealed so that the end 1a protrudes outward, and cut for opening. The opening rough surfaces 4 and 5 are formed on the bent portion 2 that is mountain-folded in the direction (arrow) and the bent portion 3 that is mountain-folded in the cutting direction (arrow) of the end protruding outward. . Thus, the cutting direction of the packaging bag material 6 (arrow)
By forming a rough surface for opening in the folded part that is mountain-folded, it is easy to open the joint end protruding outward which is difficult to open with a pillow bag, and it is continuous from one side to the other side Can be opened. The open end in the vertical direction is closed by heat sealing in a usual manner. FIG. 5 shows an example in which the present invention is applied to a gusset bag having gusset portions 30a and 30b which are folded inward on both sides. In this case, one of the gusset portions 30a is opened for opening. The rough surface 31 for opening is formed on the bent portion 31 which is folded inward in the mountain-folded direction with respect to the cutting direction (arrow).
a and a bent portion 32 folded inside the gusset portion 30a
The opening rough surface 32a is formed on the other gusset portion 30.
In b, a rough opening surface 33a is formed in a bent portion 33 which is folded inward in a mountain-folded direction with respect to a cutting direction (arrow) for opening, and a joint end protruding outward has A rough opening surface 34a is formed in each of the bent portions 34 that are mountain-folded with respect to the cutting direction (arrow) for opening. Thereby, in the gusset bag, it is possible to easily open the joint end protruding outward which is difficult to open,
It can be opened continuously from one side to the other side. As described above, according to the present invention, a small-diameter rough plastic film is provided on the front side plastic film at a portion corresponding to the bent portion which is mountain-folded in the cutting direction of the packaging bag to be formed. Since the surface row is provided at intervals in the direction in which the bending line extends and in a direction crossing the bending line at an angle, it is possible to accurately position the rough opening surface in the bending portion of the formed packaging bag. The packaging bag thus made can be easily opened from the bent portion.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a part of a pillow-shaped packaging bag made of a laminated film for a packaging bag according to the present invention. FIG. 2 is an expanded view of a pillow-shaped packaging bag of a packaging bag material before molding. FIG. 3 is a sectional view of a part of the packaging bag material provided with a rough surface for opening. FIG. 4 is an enlarged view showing a rough surface shape of the opening rough surface portion. FIG. 5 is a view showing a gusset-type packaging bag made by using the packaging film laminate film according to the present invention. [Description of Signs] 1 Pillow bag 1a Overlapping end 2 Folding part 3 Folding part 4 Unsealing rough surface 5 Unsealing rough surface 6 Folding part 7 Folding part 8 Folding part 16 Small diameter rough surface part row

Claims (1)

(57) [Rules for requesting registration of utility model] In a plastic laminated film for a packaging bag formed by laminating a plurality of plastic films, a position corresponding to a bent portion located on one side of the plastic laminated film and located at a side end of the packaging bag on which the plastic film is to be formed. The opening rough surface of a predetermined width is provided, and the opening rough surface is formed by a plurality of rows of small-diameter rough surface portion rows provided in a direction crossing the bending line at an interval in a direction in which the bending line extends and in a direction crossing the bending line. A plastic laminated film for a packaging bag, wherein each of the small-diameter rough surfaces is formed from a flaw formed in the plastic film and a plastic material filled in the flaw.