JP2007283686A - Method of manufacturing bag and bag obtained thereby - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an method of efficiently manufacturing a resin-made three-way-sealed bag in which a roundess is formed in each corner of the both sides of the bottom with two sheets of rolled film, and also to provide the bag obtained by the method. <P>SOLUTION: The manufacturing method has a rolled film welding process of feeding two sheets of rolled film made of a thermoplastic resin continuously in superimposed form and welding one edge of the superimposed sheets, the first fusion cutting process of fusion-cutting the welded edge at a specified pitch so as to form a chevron structure in which both sides are bent concavely in the form of a quarter circle while feeding the rolled film intermittently and the second fusion cutting process of fusion-cutting the rolled film transversely from the top of the chevron-shaped fusion-cut portion 9 while feeding the rolled film intermittently. The bag 11 obtained by the method is a three-way-sealed bag with a good appearance in which both sides and the bottom are sealed by fusion cutting and a roundness is formed in each corner of the both sides of the bottom. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for producing a synthetic resin bag and a bag obtained by the method.

  Conventionally, a bag body for storing stationery, haberdashery, and other commodities is a method of folding a single raw film made of a transparent thermoplastic synthetic resin into two, and fusing the raw film in a transverse direction at a predetermined pitch. (So-called side seal method).

  However, with the conventional manufacturing method, it is impossible to obtain bags with different colors and materials on the front and rear surfaces, and it is also difficult to obtain bags with rounded corners on both sides of the bottom. .

  Therefore, the present applicant examined whether there was a prior art or a commercially available product for efficiently manufacturing a bag body in which the corners on both sides of the bottom were formed using two original fabric films. Within the scope, such prior art and commercial products could not be found.

  The present invention was made under the above circumstances, and efficiently produced a three-sided seal type synthetic resin bag body with rounded corners formed on both sides of the bottom using two original fabric films. It aims at providing the manufacturing method which can be performed, and the bag body made from a synthetic resin obtained by this manufacturing method.

  In order to achieve the above-mentioned object, the bag manufacturing method according to the present invention is a method for welding one side end of a raw film made of two thermoplastic synthetic resins while continuously feeding them in an overlapping manner. Anti-film welding process and the first fusing that intermittently feeds the original fabric film, fusing the welded side edge into a chevron with a predetermined pitch and both sides of the hypotenuse bend in a semicircular arc And a second fusing step of fusing the original film in the transverse direction from the top of the chevron-shaped fusing portion while intermittently feeding the original film.

  In the production method of the present invention, before the raw film welding step, either one of the raw film is continuously fed along the side edge of the two raw films while being continuously fed. It is preferable to provide a chuck tape welding step of welding a male chuck tape having protrusions on the opposite surface and welding a female chuck tape having a concave groove on the opposite surface of the other raw film. Then, between the chuck tape welding process and the original film welding process, the protrusions of the male chuck tape are fitted into the concave grooves of the female chuck tape, and the two original films are stacked one above the other continuously. It is also preferable to provide a trim step for cutting and aligning the side end of the welded side while feeding.

  In addition, the bag according to the present invention welds one side end of the raw film made of two thermoplastic synthetic resins while continuously feeding the upper and lower layers, and intermittently feeding the original film. The side edge of the welded side is cut at a predetermined pitch into a chevron whose both sides are concave in a semicircular arc shape, and the raw film is melted in the transverse direction from the top of the chevron. It is characterized by this.

  In the bag of the present invention, a male chuck tape having protrusions on the opposite surface of one of the original film is welded along the side end of the two original films that are not welded, and the other It is preferable to weld a female chuck tape having a concave groove on the opposite surface of the original film.

  According to the manufacturing method of the present invention, one side end of the two raw film overlapped up and down in the raw film welding step is welded, and the side on which the original film is welded in the first fusing step Since the end is melted into a chevron shape (a chevron whose both sides are concave in a semicircular arc shape) at a predetermined pitch, and the original film is melted in the transverse direction from the top of the melted portion of the chevron in the second fusing process. A synthetic resin bag body made of two original film films having rounded corners on both sides of the bottom of the bag body can be efficiently manufactured. If two original films having different colors and materials (types of resin) are used, synthetic resin bags having different colors and materials on the front and rear surfaces can be obtained.

  In particular, in the manufacturing method in which the chuck tape welding step is provided before the raw film welding step, a bag body including a simple chuck means including a male chuck tape and a female chuck tape on the inner surface of the upper end opening is manufactured. can do. In the manufacturing method in which the trim step is provided between the chuck tape welding step and the raw film welding step, the ends of the upper and lower two original fabric films to be welded are cut and aligned neatly. In the next raw film welding process, the side edges of the raw film become easy to be welded, and there is no fear of causing poor welding or the like.

  In addition, the bag of the present invention manufactured by the above manufacturing method has rounded corners on both sides of the bottom, so that the appearance is good and the corners are not caught. And just by changing the color and material of the two original films, it becomes a synthetic resin bag with different colors and materials on the front and rear surfaces. The bag body to which the female chuck tape is welded can close the opening of the bag body simply and simply by fitting the protrusions of the male chuck tape into the concave groove of the female chuck tape.

  Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view showing two upper and lower raw film films on which male and female chuck tapes are welded in a chuck welding process, and FIG. 2A is an enlarged partial sectional view taken along line AA in FIG. 2B is an enlarged partial cross-sectional view taken along line BB in FIG. 1, FIG. 3 is a perspective view illustrating a trim process and a raw film welding process, and FIG. 4 is a first fusing process and a second fusing process. FIG. 5 is a perspective view of a bag body obtained by the manufacturing method of the present invention, and FIG. 6 is a cross-sectional view taken along the line CC of FIG.

  According to a preferred embodiment of the manufacturing method according to the present invention, first, in the chuck tape welding step, as shown in FIG. 1, along the side edges of the upper and lower two original fabric films 1 and 2 that are not welded, The male chuck tape 3 is welded to the opposite surface (lower surface) of one of the upper and lower original films (the upper original film 1 in FIG. 1), and the other original film (the lower side in FIG. 1). The female chuck tape 4 is welded to the opposite surface (upper surface) of the original film 2).

  The raw films 1 and 2 can be any of a transparent transparent film, a colored transparent film, a colored opaque film, or a printed film as long as it is a film made of a thermoplastic synthetic resin that can be thermally welded. A nonwoven fabric made of thermoplastic synthetic resin fibers can also be used. The upper and lower two original fabric films 1 and 2 may use the same film, but considering the application of the bag to be manufactured, the color and material (type of resin, presence / absence of printing, presence / absence of transparency) , Film or nonwoven fabric) are preferably used in appropriate combination.

  As shown in FIG. 2, the male chuck tape 3 is a thermoplastic resin tape in which the ridges 3a are formed over the entire length of the tape, and the female chuck tape 4 is fitted with the ridges 3a. It is a tape made of a thermoplastic resin in which the concave groove 4a is formed over the entire length of the tape. These chuck tapes 3 and 4 are automatically heat-welded to the opposing surfaces while continuously feeding the original films 1 and 2 using a chuck tape welding device (not shown).

  When the chuck tape welding process is completed, as shown in FIG. 3, the upper and lower original films 1 and 2 are displaced from each other by fitting the protrusions of the male chuck tape into the grooves of the female chuck tape. The sheets are stacked so as not to occur, and are continuously sent to the next trimming process, and the side edges of the original films 1 and 2 to be welded are cut by the cutter 5 and are neatly aligned. And it is continuously sent to the next original fabric film welding process, and as shown in FIG. 3, the cut | disconnected edge of the upper and lower original fabric films 1 and 2 is heat-welded by the welding apparatus 6. As shown in FIG.

  As shown in FIG. 4, the upper and lower raw films 1 and 2 whose side edges are heat-welded as described above are intermittently sent to the first fusing process via the adjustment / relaxation region 7 and are heat-welded. One side end portion is blown into a chevron at a predetermined pitch by the first fusing device 8 that moves up and down. Since this chevron-shaped fusing part 9 is formed in order to bend both sides of the bottom of the bag body to be produced, as shown in FIG. Is done.

  As shown in FIG. 4, the upper and lower raw films 1 and 2 formed with the chevron-shaped fusing part 9 are intermittently sent to the second fusing process and moved up and down by the second fusing device 10 that moves up and down. The melted portion 9 is melted in the transverse direction of the original film, and the target bag 11 is obtained by the second melting. In that case, the male and female chuck tapes of the bag 11 are obtained by intermittently crimping the male and female chuck tapes by the chuck tape crimping device 12 that moves up and down in front of the second fusing device 10. It is desirable to prevent both ends of the tape from causing poor welding.

  The bag body 11 of the present invention obtained by the above-described manufacturing method has two upper and lower original films 1 and 2 in which male and female chuck tapes 3 and 4 are heat-sealed on opposite surfaces and are continuously stacked. One end of the film is trimmed and welded while being fed, and the side edges of the welded side film 1 and 2 are intermittently fed at a predetermined pitch and the oblique sides on both sides are formed in a semicircular arc shape. Since the original films 1 and 2 are melted and cut in a transverse direction from the top of the chevron-shaped melted portion 9, as shown in FIGS. 5 and 6, The bag body 11 is a three-side seal type bag body whose both sides and bottom are sealed by fusing, and has a good appearance with rounded corners 11a, 11a on both sides of the bottom. And by changing the color and material of the upper and lower original fabric films 1 and 2, it is possible to obtain a bag 11 having different colors and materials on the front surface and the rear surface. It is possible to obtain an optimal bag body in consideration of the type of product. Further, when the simple chuck means including the male and female chuck tapes 3 and 4 is formed on the inner surface of the opening as in the case of the bag body 11, the protrusion 3 a of the male chuck tape 3 is formed into the female mold. The opening of the bag body 11 can be closed very simply by fitting it into the concave groove 4 a of the chuck tape 4.

  As described above, the manufacturing method of the present invention incorporates the chuck tape welding process, the trimming process, the raw film welding process, the first fusing process, and the second fusing process into one line, so that the corners on both sides of the bottom portion are integrated. This is an excellent method capable of efficiently producing a three-sided seal type bag body (having a simple chuck means on the inner surface of the opening) made of two raw film having rounded corners.

  Needless to say, when a three-side seal type bag body having no simple chuck means on the inner surface of the opening is obtained, the above-described chuck tape welding step may be omitted.

It is a perspective view which shows the upper and lower two original fabric films to which the male type | mold and the female type | mold chuck tape were welded at the chuck | zipper welding process in the manufacturing method of this invention. (A) is the AA line expanded partial sectional view of FIG. 1, (b) is the BB line expanded partial sectional view of FIG. It is a perspective view explaining the trim process and original film film welding process in the manufacturing method of this invention. It is a perspective view explaining the 1st fusing process and the 2nd fusing process in the manufacturing method of the present invention. It is a perspective view which shows one Embodiment of the bag body manufactured by the manufacturing method of this invention. It is CC sectional view taken on the line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 2 Original fabric film 3 Male-type chuck tape 3a Convex strip 4 Female-type chuck tape 4a Concave groove 9 Mountain-shaped melted part 11 Bag body

Claims (5)

A raw film welding step of welding one side end of the raw film made of two thermoplastic synthetic resins while continuously superposing and feeding the original film,
A first fusing step of fusing a side edge of the welded side into a chevron that is bent into a semicircular arc shape at both sides with a predetermined pitch while intermittently feeding the raw film;
A second fusing step of fusing the raw film in the transverse direction from the top of the cut portion of the chevron while intermittently feeding the original film,
A method for producing a bag, comprising:   Before the raw film welding step, a male having a ridge on the opposite surface of one of the original film along the side edge of the original film while continuously feeding the two original films. The bag body according to claim 1, further comprising a chuck tape welding step for welding a female chuck tape having a concave groove on an opposite surface of the other raw film while welding the mold chuck tape. Manufacturing method.   Between the chuck tape welding process and the raw film welding process, the ridges of the male chuck tape are fitted into the concave grooves of the female chuck tape, and the two original films are stacked and fed continuously. The method of manufacturing a bag body according to claim 2, further comprising a trim step of cutting and aligning the side end of the welded side.   Two sides of the original film made of thermoplastic synthetic resin are welded at one side end while being continuously fed in layers, and the side end of the welded side is fed while intermittently feeding the original film. A bag having a predetermined pitch and melted into a chevron whose both sides are bent in a semicircular arc shape, and further melted in the transverse direction from the top of the melted part of the chevron.   Along with the side edge of the two original films not welded, a male chuck tape having protrusions is welded to the facing surface of one of the original film, and the facing surface of the other original film The bag according to claim 4, wherein a female chuck tape having a concave groove is welded to the bag body.

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