JPH046516B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Field of Application> The present invention relates to a method for manufacturing a synthetic resin film bag having a printed surface on the inner surface.

<Prior Art> In conventional synthetic resin film bags, the printed surface is the outer surface.

<Problems to be Solved by the Invention> As described above, when the printed surface of the bag is the outer surface, there is a drawback that the printed surface is abraded or stained.

Furthermore, when printing on the front and back sides of the outer surface of a synthetic resin film bag, two printing steps are required as the front and back sides of the bag are printed separately, and an expensive bag reversing device is also required, resulting in high costs. There was a drawback.

Therefore, the present invention prevents the printed surface from being worn out or soiled, and even when printing on the front and back sides of synthetic resin film bags, printing can be done in one step, eliminating the need for expensive bag reversing equipment and reducing costs. The purpose is to provide a cost-effective bag manufacturing method.

<Means for Solving the Problem> As shown in FIGS. 1 and 2, the means for solving the problem according to the present invention is as shown in FIGS. 1 and 2. Fold into two sheets using a two-sheet folding device (not shown). Next, seal the free end on the opposite side of the fold line to make it cylindrical. At the starting end of the sealing position, insert a cutting blade 2' with an electric heating element 3 whose blade part is formed into an arc-shaped body 2 in a downward direction. While passing through the blade stand 4 provided in the front half of the cutting blade 2', the unnecessary part 5 of the seal end is cut into a tape shape on the outside of the cutting blade 2', and remains inside the cutting blade 2'. The sealing position is slid onto the arc-shaped cylinder 2 and sealed together by the heat of the cutting blade 2'.

Next, the cylindrical film is cut to a required size, and the bottom of the cut film is sealed by a known appropriate method to form a bag.

<Function> In the above problem-solving means, since the flat synthetic resin film is printed and then sealed into a cylindrical shape,
Bags can be made with the printed surface on the inside, the printing will not be worn out or soiled, the design can be continuous on the inner upper surface and the inner lower surface of the bag, and printing can be done in one step.

<Example> Hereinafter, an example of the present invention will be described based on FIGS. 1 and 2. A plain fabric A of a printed film is placed in two parts so that its printed surface (printed pattern not shown) is the inner surface. Fold into two sheets using a sheet folding device (not shown). Next, seal the free end on the opposite side of the fold line to make it cylindrical. At the starting end of the sealing position, insert a cutting blade 2' with an electric heating element 3 whose blade part is formed into an arc-shaped body 2 in a forward downward direction. While passing through the blade stand 4 provided at the front half of the cutting blade 2', the unnecessary part 5 of the seal end is cut into a tape shape on the outside of the cutting blade 2', and remains inside the cutting blade 2'. The sealing position is slid onto the arc-shaped cylinder 2 and sealed together by the heat of the cutting blade 2'.

Next, the cylindrical film is wound onto a winding roll 1,
Next, the cylindrical film is cut to a required size, and the bottom of the cut film is sealed by a known appropriate method to form a bag.

In the above, so that the printed surface is the inside surface,
Using an appropriate two-folding device, the unnecessary portion 5 of the end of the original fabric A of the synthetic resin film folded into two is cut into the cutting blade 2'.
When the cutting blade 2' is cut to the outside, the two ends touching the inside of the cutting blade 2' move forward in the winding direction as a unit, and the cutting blade 2' is provided downward in the front. The integral part gradually rises from the cut end of the cutting blade 2' and reaches the arc-shaped body 2 part of the cutting blade 2', forming a solid and strong sealing part.

Since the degree of filling is proportional to the time the seal portion passes through the arc-shaped body 2, the length of the cutting blade 2' may be adjusted to an appropriate length depending on the size and type of bag. In any case, since the seams are folds in the bag, they are not particularly noticeable, resulting in a beautiful bag.

<Effects of the Invention> As described above, the present invention folds a plain sheet of printed film into two sheets so that the printed surface becomes the inner surface, and seals the free end opposite to the fold line to form a bag. This is a method of forming.

However, conventional synthetic resin film bags are printed and made from tubes, requiring two printing steps on the front and back, but in the present invention, printing is done on a flat synthetic resin film. Since it is sealed in a cylindrical shape, bags can be made with the printed side on the inside, and the printing will not be worn out or smudged, and the design can be continuous on the inside top and bottom sides of the bag, and it can be printed in one step. This has an excellent effect of reducing construction costs.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a synthetic resin film bag manufacturing apparatus according to an embodiment of the present invention, and FIG. 2 is a perspective view of the main parts thereof. 2': Cutting blade, 2: Arc-shaped body, 3: Electric heating element, 4: Blade base, 5: Unused part.

Claims (1)

[Claims] 1. Fold a plain sheet of printed film into two sheets so that the printed surface becomes the inner surface, and seal the free end on the opposite side of the fold line to form a cylinder. A cutting blade with an electric heating element formed into an arc-shaped body is installed downwards in the front, and while passing through the blade stand provided in the front half of the cutting blade, the unnecessary part of the sealed end is cut into a tape shape on the outside of the cutting blade. , the sealing position remaining inside the cutting blade is slid onto the arc-shaped body of the cutting blade and sealed together by the heat of the cutting blade, then the cylindrical film is cut to the required size, and the bottom of the cut film is sealed. A method for manufacturing a synthetic resin film bag, which is characterized by sealing and forming a bag using an appropriate method.