JPH0331342B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a bag making method for manufacturing bags in two rows from one long sheet.

<Prior Art> A method of manufacturing a bag by rolling up a long sheet and sealing both ends together and at right angles to the direction of travel is well known. in this case,
The bags are manufactured in a row.

There is also a method of manufacturing bags in two rows by stacking and sealing the side edges of two sheets and also sealing the center, and a method of manufacturing bags in two rows by sealing tube-shaped sheets in the center. Methods of manufacturing are also well known. In this case, two rows of bags are cut at the center using a single cutter to form one row of bags.

<Problems to be Solved by the Invention> By the way, when manufacturing bags by sealing, it is common to preheat the sealing part during continuous heat sealing before sealing. Since wrinkles occur, if the cutter is cut with a single cutter as in the past, the wrinkles will remain and the sealing part will not get dirty.

<Means for Solving the Problems> The present invention has been made to solve the above-mentioned problems, and consists of two rows formed by folding both ends of a single long sheet and sealing the seal portion at the center of the sheet. A method of manufacturing a bag by making two rows of V-shaped cuts facing toward the storage section of the bag in the center of the bag, and then cutting the center seal. This bag-making method is characterized in that the bag is cut using two cutters, including a portion of the V-shaped cut.

Next, the present invention will be explained in detail using the drawings.

The drawings show embodiments of the invention, FIGS. 1a and b
2 is an explanatory plan view and an explanatory side view of the bag making machine, and FIGS. 2A to 2F are explanatory diagrams illustrating each corresponding process.

Note that in all drawings, arrows indicate the direction in which the sheet travels.

In Figures 1a and b, 1 indicates a long sheet,
Specifically, it is a plastic film such as polypropylene or polyamide. First, in step A, this film is pulled out from the winder, and along with it,
A paper filter tape 2 coated with a sealant on one side is also drawn off from the two windings.

Thereafter, as shown in FIG. 2B, the film 1 is inserted between the carriage and the surface plate 3, and both ends of the film are folded inward by the guide plate. (Step B) That is, both ends of the film 1 are folded inward so as to surround the two surface plates 3, and a paper filter 2 is placed at a position slightly away from both ends of the folded film 1. exists. At this time, the paper filter 2 is inserted between the films 1.

After this, the preheating heater 4 and the sealing roller 5
Center-sealed and further cooled by a cooling roll 6.

This obtained seal part is attached to the center seal part 12.
It is called. (Step C) Perforations 11 are also made using a perforation roller 7 formed with a perforation blade. (Step C') The perforation 11 may be made by the perforation roller 7' before the film 1 is inserted between the surface plate 3 and the traveling table, but in any case, as shown in FIG. After steps C and C', the state is as shown in FIG. 2C. The part marked with many dots in FIG. 2C shows this center seal portion 12.

Thereafter, in step X, the process proceeds to the next step via the dancer roll 9. The process before this dancer roll 9 moves continuously, and the process after that moves intermittently, but both the continuous drive mechanism and the intermittent drive mechanism are omitted from illustration.

Any known drive mechanism may be used.

In this specification, "continuous" is used only when the film 1 moves at a substantially constant speed without interruption (without stopping), and therefore does not include intermittent movement in which movement and stopping are repeated. . In step D, a crease heater 21 creases the film 1 with both ends folded inward. In step D', sealing is performed substantially perpendicularly to the direction in which the film 1 travels. This seal will be referred to as a bottom seal hereinafter, and numeral 22 indicates this bottom seal device, and the portion marked with many dots in FIG. 2D indicates the bottom seal portion 13.

In step E, the cutting blade device 23 makes a V-shaped cut 14 facing toward the storage section of the bag. This cut 14 is used to tighten the bag when opening it after storing and sealing the bag.
It is inserted into the center seal portion 12 at both ends in Figure E, but do not cut it all the way to the paper filter 2.

In step F, the center portion of the film 1 is cut in the middle using a cutter 24 consisting of two cutters. The center cut is made so as to cover the V-shaped cut 14, and at the same time as the center cut, the tape-shaped film 15 cut from the center is removed using a blower (not shown). Further, the fragments of the V-shaped cut 14 are simultaneously removed to form a V-notch.

The final step Y is a step of cutting the formed bags into individual bags using the cutter 25 and stacking them.

Here, in step F, in order to make two rows of bags into a single row, the reason why two cutters are used to cut the bags in the middle instead of one cutter is explained below. .

In the bag manufactured according to the present invention, after the both ends of the film 1 are folded inward in the step B, when the center part is preheated in the step C, wrinkles will occur at both ends of the film 1, so the center part is sealed. There are wrinkles behind. Therefore, the wrinkles are trimmed by cutting the center part with two cutters.

Furthermore, at the same time as the middle drop, the pieces of the V-shaped cut are also removed without fail.

<Effects of the Invention> Since the bag making method of the present invention cuts the middle part of the two-row bag with two cutters, it is possible to trim wrinkles generated in the center seal part. Therefore, a bag with a clean seal can be manufactured.

Moreover, there is an effect that the fragments of the V-shaped cut made before cutting can be removed at the same time as the cut-out part.

[Brief explanation of the drawing]

The drawings all show embodiments of the present invention, and FIGS. 1a and 1b are a top view and a side view of the bag making machine, and
Figures A to F are explanatory diagrams explaining each process. 1...Film, 2...Paper filter tape, 3
... surface plate, 4 ... preheating heater, 5 ... seal roller, 6 ... cooling roll, 7, 7' ... perforation roller, 8 ... tension roller, 9 ... dancer roll, 11 ... perforation, 12 ... center seal part,
13...Bottom seal portion, 14...Slit, 15...Film, 21...Folding heater, 22...Bottom seal device, 23...Cutting blade device, 24...Middle cutter, 25...Cutter.

Claims (1)

[Claims] 1. Two rows of V-shaped cuts facing toward the storage section of the bag are placed in the center seal of the two-row bag made by folding both ends of one long sheet inward and sealing the center of the sheet. A method of manufacturing a bag by cutting the center seal part after placing the bag in a bag, the center seal part being cut by two cutters including a part of the V-shaped cut. A bag making method characterized by: