JPH11255211A - Method for lap welding paired triangular tops formed by folding end of resin film bag packaging plural paper rolls - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for lap welding a pair of triangular tops of a bag capable of withstanding gravity at the time of taking up the bag to transport it even in the case of using a welded portion as a carrying handle by forming a tight welded portion which permits no bubbles to be embraced therein. SOLUTION: A heatable roller 5 having a plurality of grooves or protruding stripes 6, which extend along the circumference of the roller, and a receiving plate 10 for the roller 5 are prepared. The receiving plate 10 is inserted into a space directly under a pair of triangular tops 1c, 1d, which are in a state that they are overlapped each other and, by rotatively moving the roller 5 from one side of an upper face of both the tops in the overlapping state to the other side thereof, a stripe-like welded portion, in which welded zones and non-welded zones are alternately arranged, is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of wrapping a plurality of roll papers and welding a pair of triangular apical portions formed at the time of folding an end portion of a resin film bag.

[0002]

2. Description of the Related Art The overlapping portion of a pair of triangular peaks has been conventionally heat-sealed in a final finishing step in a packaging operation of a resin film bag in which a plurality of roll papers are packaged.

[0003] Japanese Patent Publication No. 5-67506 filed by the present applicant
Discloses a concept in which a tape made of a resin film is attached to the heat-welded polymerized portion to enable a handbag.

[0004]

As described above, the overlapping portion of the pair of triangular apexes is used as a handbag, and therefore, when the user puts his / her finger, lifts, and transports the package, the entire package is used. Since the main part is loaded with its own weight, a welding strength that can withstand the weight is required.

[0005] However, the overlapping portion is conventionally so-called solid attachment, in which the entire overlapping portion of the pair of triangular peaks is uniformly heat-welded, so that air bubbles are trapped in the inner layer of the bonding portion, Since there was no escape place, the adhesion state became a spot (madara) shape, and it was partial welding containing the non-adhesion part, so when you lift it with your fingers,
It was not possible to support its weight, and a pair of triangular peaks often separated.

[0006] In order to reinforce such a welded portion in a bubble-enclosed state, even if an attempt is made to attach a tape made of a resin film to the welded portion, a spot-like air bubble is formed on the welded portion serving as a substrate to be attached. Is dispersed and included, a step due to unevenness is generated between the bubble inclusion portion and the welded portion, the adhesive becomes unstable, and it becomes difficult to uniformly adhere the resin film tape, and the result of reinforcement Could not be played.

[0007] A first object of the present invention is to solve the above-mentioned problems and form a tight welded portion in which air bubbles cannot be included.
It is an object of the present invention to provide a method of overlapping a pair of triangular vertices that can withstand gravity during lifting and transportation even when the welded portion is used as a handhold.

A second object of the present invention is to solve the above-mentioned problems and to provide a method of overlapping and welding a pair of triangular tops which can be used as a substrate on which a resin film tape for carrying can be firmly adhered. That is.

[0009]

SUMMARY OF THE INVENTION According to the present invention, a plurality of triangular apexes are welded along a circumferential direction when a pair of triangular apexes are formed at the end of a resin film bag in which a plurality of roll papers are wrapped. Prepare a heatable roller having a concave groove or a ridge and a receiving plate of the roller, and insert the receiving plate directly under a state where the pair of triangular apexes overlap each other, and on the receiving plate Rolling the roller from one side to the other side of the upper surface of the pair of triangular apexes in an overlapping state, the welding zone and the non-welding zone for the overlapping pair of the triangular apex. Are alternately arranged to produce striped welding.

The roller rolls in a direction parallel to a line connecting the two triangular peaks or in a direction intersecting a line connecting the two triangular peaks.

[0011]

In FIG. 1, a resin film bag 1 has a total of 12 roll papers, for example, four roll papers, for example, four stacked in three stages, and the end of the bag is first placed on one of the opposite ends. When folded from 1a and 1b, the other opposing ends 1c and 1d are folded into a pair of triangles,
It is well known that the bag mouth is closed when the pair of triangular vertices overlap one another. It is also known that the overlapping portions 2 of the pair of triangular vertices are uniformly welded and closed.

By the way, according to the present invention, in the well-known uniform thermal welding, spots (madara) are formed on various parts of the inner layer at the welding site.
Since the bubbles were trapped and welded, the strength in the shear direction under a gravitational load was insufficient, and there was a strong tendency for the polymerized weld to come off. Therefore, in the present invention, the heat welding of the overlapping portion 2 is performed by using a welding zone,
This is a striped welding in which non-welding zones are alternately arranged, and a specific example thereof is shown in FIGS. 2 and 3.

In FIG. 2, the overlapping portion 2 of a pair of triangular peaks is formed by alternately arranging welding zones 3 and non-welding zones 4 along a direction parallel to a line connecting both tops. As a whole, a welded portion having an alternate linear stripe pattern is formed.

FIG. 3 shows an embodiment for forming the welded state of the striped pattern. Reference numeral 5 denotes a heatable roller having a plurality of ridges 6, 6, 6,... And
Both ends of the shaft 7 are rotatably supported by free ends of arms 8 and 9, respectively. Reference numeral 10 denotes a receiving plate, which is inserted just below the overlapping portion 2 of the pair of triangular vertices when the roller 5 is operated.

In FIG. 3, the receiving plate 10 is
After pressing the heated roller 5 against the upper surface of the overlapping portion 2 at the same time as rolling the roller 5 from the solid line position to the broken line position and then separating the roller 5 from the upper surface of the overlapping portion 2 Only the ridge 6 of the roller 5 contacts the overlapping portion 2 to form the welding zone 3, and the concave groove between the ridges 6 of the roller 5 rolls while floating from the overlapping portion 2. Therefore, the non-welded zone 4 is formed, and the striped weld shown in FIG. 2 is formed as a whole.

The rolling of the special heating roller 5 causes the overlapping portion 2 to press, so that the air bubbles on the welding zone 3 generated by the ridge 6 cause the non-welding zone 4 or the non-welding zone to be adjacent to both of the ridges 6. The welding zone 3 does not remain in the welding zone 3, so that the welding zone 3 is thin, but a pure intrinsic welding that does not trap air bubbles is uniformly secured therein, and several such welding zones 3 are provided. Thereby, the welding strength is significantly improved.

The roller 5 shown in FIG.
Although the embodiment having... Has been shown, the same effect can be obtained by arranging a plurality of concave grooves instead of ridges.

FIG. 4 shows an embodiment in which the arrangement of the welding zone 3 and the non-welding zone 4 is provided in a direction intersecting a line connecting the two triangular tops 1c and 1d.

[0019]

As described in detail above, the present invention uses a heatable roller having a plurality of circumferentially extending concave grooves or ridges to form a pair of triangular apex overlapping portions. On the other hand, since a band-like welding in which the welding zone and the non-welding zone were alternately arranged was caused, bubbles in the welding zone escaped to the non-welding zone adjacent on both sides thereof and did not remain in the welding zone. By arranging several such welding zones, thin and genuine pure and genuine welding was uniformly secured, and thus a welded part with significantly improved overall welding strength was successfully produced. Therefore, even if the welded portion is used as a handbag, it is possible to sufficiently withstand the gravitational force applied during lifting and carrying.

Further, according to the present invention, when it is desired to attach a resin film tape for carrying to the welded portion, several non-welded zones adjacent to each other between the several welded zones are one with respect to the welded zone. Since they protrude likewise and evenly, a tight welding relationship is created between the non-welded zone and the tape, and a remarkable effect is also exerted on the adhesion of the resin film tape for carrying.

[Brief description of the drawings]

FIG. 1 is welded by a welding method according to the invention;
FIG. 9 is a perspective view of a specific example showing a striped welding state of an overlapping portion of a pair of triangular apexes generated at the time of folding an end portion of a resin film bag wrapped with a plurality of roll papers,

FIG. 2 is an enlarged detailed plan view of FIG. 1;

FIG. 3 is a plan view illustrating a process of forming a striped welded portion shown in FIG. 2;

FIG. 4 is a plan view showing another embodiment of a striped welding state.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Resin film bag 1a and 1b One opposing end side 1c and 1d The other opposing end side forming a pair of triangular peaks 2 Overlapping part of a pair of triangular peaks 3 Welding zone 4 Non-welding zone 5 Heating Possible rollers 6,6,6 ···· A plurality of ridges arranged in a line in the circumferential direction 7 Arms that support both ends of shafts 8 and 9 freely to rotate 10 Receiving plate

Claims (3)

[Claims] 1. A plurality of concave grooves or ridges extending in a circumferential direction at the time of overlapping welding of a pair of triangular apexes generated when folding an end portion of a resin film bag wrapped with a plurality of roll papers. Prepare a heatable roller and a receiving plate of the roller, insert the receiving plate immediately below the pair of triangular tops overlapping each other, and, on the receiving plate, the pair of triangular tops The roller is rolled from one side to the other side of the upper surface of the triangular apex to form a striped pattern in which welding zones and non-welding zones are alternately arranged on the pair of overlapping triangular apices. A method for superposing and welding a pair of triangular apexes, which is generated when an end portion of a resin film bag packed with a plurality of roll papers is folded, causing welding. 2. The welding method according to claim 1, wherein the roller is rolled in a direction parallel to a line connecting the two triangular apexes. 3. The welding method according to claim 1, wherein the roller is rolled in a direction intersecting a line connecting the two triangular peaks.