JPS59221244A - Method of sealing one side section in order to form bag withbottom - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a method of sealing one side cut for forming a garden bag.

The present inventor is Patent Application No. 200868, filed in 1982, and Patent Application No. 57
No. 16265, etc., a cylindrical packaging material is supplied in a flat shape with the middle part held in between, and a cut on one side of the cylindrical packaging material is expanded in a direction perpendicular to the flat shape to form a joint seal. A side seal is applied between the hypotenuses of the hexagonal sides on both sides, which are perpendicular lines, passing through the joint seal, and the 6 sides outside of this side seal are
We have proposed a so-called bag with an eave, in which the corner sides are cut off to form a standing-shaped bottom, or after the hexagonal sides are joined and sealed, the hexagonal sides on both sides are folded back and glued to the center to form a brown bag-shaped bottom. However, conventionally, after blowing air to one side cut of the supplied cylindrical packaging material to open the cut, an expansion bar is advanced and the expansion action flattens the cut. The bar is separated from the cut at the point where it is expanded in the direction perpendicular to the shape, and then the bar is joined and sealed along the entire length of the cut. This may cause problems such as slippage and wrinkles, and there may also be problems such as creases and creases that may be left inside the packaging material due to the middle part that holds the cylindrical packaging material in place to seal the entire length of the expanded cut. This will block the escape area for the accumulated air, making it difficult to adhere the side seals and hexagonal sides back together, resulting in poor sealing in some areas and bulges, creating an ugly bottom surface that lacks aesthetic appeal. There was a period of construction.

The present invention aims to solve these problems, and its main features are that the cylindrical packaging material to be supplied is made into a flat shape, pinched at the middle part, and opened at one side of the supplied cylindrical packaging material. Insert the expanding bar into the opened cut, and expand the cut in the direction perpendicular to the flat shape by the expanding action of the bar.
, the area of the widening cut between the bars is bonded and sealed.

In this way, the incisions are joined together under tension due to the entry of the expansion bar and its expansion action, which spreads the incisions together, so the incisions do not shift and the risk of wrinkles is eliminated. As a result, it is possible to accurately and reliably seal a predetermined shape. In addition, the unsealed portions at both ends of the joint seal act as suitable vent holes for the internal air after the bar is removed, so that the side seals and triangular side parts can be easily bonded by folding back and forth after the joint seal. As a result, it is possible to solve problems such as poor sealing caused by air pockets tb and poor cosmetic appearance caused by folding back in a bulging state.

The attached embodiment drawings will be described in more detail below.

In advance, attach the back sticker 11 and the fold line 12゜12 on both sides.
The middle part of the cylindrical packaging material A prepared in a flat shape is held down by a pinching tool in a crosswise manner. is sprayed to open the cut 13, and the expanding bar 14 is inserted into the opened cut 13.
, 14', and the opening operation of the bar opens the cut 1.
3 in a direction perpendicular to the flat shape of packaging material A.

This widening cut 13 protrudes from the cylindrical packaging material A in the shape of a narrow strip in the same way as before folding the back sticker 9, and remains in the closed state. The cut 13 in the area between the two is joined and sealed 15 between the hot plates 19 and 19'. When the joining seal 15 is completed, the bars 14, 14' move back and separate from the non-sealed parts 16, 16' at both ends of the cut 13, and then in a bending process, the joining seal 15 is attached to one side of the bottom surface. After bending, the pentagonal sides 17 at both ends with the joining seal 15 as a perpendicular line are
"i cut off to form a hexagonal scunding (able to stand on its own) bottom surface 20, or side seal 1
8, 18' to 17 or not, triangular side L7 +
17' is folded back and glued to the bottom center side to form the bottom 21 in the shape of a tea bag bottom.

As described above, bottomed bags with excellent airtightness and watertightness can be manufactured in an orderly manner, and furthermore, by arranging each of the above steps into a line, it is possible to automate and continuously manufacture the bags. .

In short, according to the present invention, the expansion bar enters the side cut 1 and operates to expand, and the area between the bars is joined and sealed, so the cut does not wrinkle or shift due to tension. They are joined and sealed in an orderly manner at a predetermined position.

Furthermore, after the joining seal J5, the non-sealed parts 16, 16' from which the bars 14, 14' are removed act as air vent holes 7, so that the side seals 18, 1a' or the pentagonal sides 17
, 17' has the effect of making it easier to fold back and improve cosmetic appearance.

[Brief explanation of drawings]

Figure 2+11 is a front view showing the process of holding the bag in a pinched state with a clamping tool, cutting off the side seals and hexagonal sides, and folding the bag in order, and Figure 3 is a perspective view of the manufactured bag with a bottom. ,1
1 is the back sticker % 12, 12'r fold, 13 is one side cut, H4, 14' is the expansion bar, 15 is the joint seal, 16, j6' is the non-sealed part, 17, 17' is Triangular sides, 13, 18' are side surfaces, seals, 19, 1
9' is a hot plate, 20 and 21 are bottom ml, and 22 is a clamping device.

Claims (1)

[Claims] A cut on one side of the cylindrical packaging material, which is supplied in a flat shape and pinched at the middle part, is opened, an expanding bar is inserted into the opened cut, and the widening operation of the bar causes the cut to be opened. A method for sealing one side cut for forming a garden bag, characterized by expanding the bars in a direction perpendicular to the flat shape and joining and sealing a range of the expanded cut between the bars.