JP4881087B2 - Manufacturing method of continuous plastic bag - Google Patents

Description

  The present invention relates to a method for producing a continuous plastic bag in which a plurality of plastic bags each having a “hand bag” are connected in a strip shape.

A continuous plastic bag in which a plurality of plastic bags are arranged in a strip shape is continuously manufactured by performing various processes on a cylindrical plastic sheet, and is usually wound into a roll and shipped. At the time of use, a necessary number of plastic bags are drawn out from the continuous plastic bag wound up in a roll shape, and this plastic bag is cut off from the continuous plastic bag at the cut broken line and used as a garbage bag or a shopping bag. (See Patent Document 1).
JP 2004-175399 A

  In the conventional continuous plastic bag manufacturing method, various processing is sequentially performed on the cylindrical plastic sheet. However, it is difficult to perform complicated processing on the cylindrical plastic sheet flowing at a high speed on the production line. For example, it is not easy to manufacture a continuous plastic bag in which a plurality of plastic bags each having a “hand bag” are connected in a band shape because the processing of the “hand bag” is difficult. Even if such a continuous plastic bag can be manufactured, a special device is required for processing the “hand bag”, which may increase the manufacturing cost.

  Therefore, the main problem to be solved by the present invention is to provide a continuous plastic bag manufacturing method capable of easily and inexpensively manufacturing a continuous plastic bag in which a plurality of plastic bags each having a “handbag” are connected in a strip shape. It is.

The invention described in claim 1 is a process for producing a continuous plastic bag 10 in which a plurality of plastic bags 12 each having a gusset 18, a handbag 22, a bag bottom 20 and a knot 24 are connected in a strip shape. ) Preparing a continuous cylindrical plastic sheet 30; (b) forming the gusset 18 by folding both sides of the cylindrical plastic sheet 30 in the width direction inwardly; and (c) the cylindrical plastic sheet. 30 is formed in the longitudinal direction of the cylindrical plastic sheet 30 while forming the welded portion 22b constituting the upper end portion of the hand-held portion 22 by thermally welding the portion in which the gusset 18 is formed linearly in the width direction. The bag bottom 20 of the adjacent plastic bag 12 is formed by thermally welding the position adjacent to the welded portion 22b over the entire length in the width direction, and (d) the cylindrical shape By folding the portion of the plastic sheet 30 where the gusset 18 is formed on the surface of the cylindrical plastic sheet 30, the valley bottom portions 18 a of the gusset 18 are arranged at both ends in the width direction of the cylindrical plastic sheet 30 ( e) forming the annular hand- carrying portion 22 and the knot portion 24 by partially punching both ends in the width direction of the cylindrical plastic sheet 30 to form a window 22c in the valley bottom portion 18a of the gusset 18. It is a process for producing a continuous plastic bag.

According to the present invention, by performing simple processing such as “folding”, “thermal welding”, “folding”, and “punching” in order , a plurality of polys having “hand-carrying portion 22” and “knotting portion 24”. The continuous plastic bag 10 in which the bags 12 are continuous in a band shape can be easily manufactured.

  The invention described in claim 2 is the “method for manufacturing a continuous plastic bag” described in claim 1, wherein “f) in the cylindrical plastic sheet 30 after any of the steps (a) to (e). A cutting broken line 14 is formed at the boundary between the two adjacent plastic bags 12 ".

  In the present invention, a cut broken line 14 for cutting is formed in a cylindrical plastic sheet 30.

According to the first and second aspects of the present invention, by simply performing simple processing on the cylindrical plastic sheet 30, the plurality of plastic bags 12 having the “handbag portion 22” and the “tie portion 24” are obtained. The continuous plastic bag 10 connected in a strip shape can be easily manufactured. Therefore, it is not necessary to use a special device for processing the “hand-held portion 22”, and it can be manufactured at low cost using a general-purpose device.

  FIG. 1 is a perspective view showing a continuous plastic bag 10 manufactured by the “continuous plastic bag manufacturing method” according to the present invention. The continuous plastic bag 10 (FIG. 1) is a continuous sheet bag in which a plurality of plastic bags 12 are connected in a strip shape through a cut broken line 14 and is continuously continuous by a heat-weldable plastic material such as polyethylene. Is formed.

  The plastic bag 12 which comprises the continuous plastic bag 10 is used as a shopping bag or a garbage bag etc., and as shown in FIG. 2, the gusset 18, the bag bottom 20, the handbag part 22, the knot part 24, have.

  That is, the plastic bag 12 (FIG. 2) includes a cylindrical bag main body 16 that constitutes a storage portion 16a for storing purchased goods and garbage as a main component, A gusset 18 for securing the capacity of the accommodating portion 16a is formed by folding the bag body 16 in a valley shape inward. Moreover, the bag bottom 20 which seals the bottom part of the accommodating part 16a is formed in the bottom part of the bag main body 16 by heat-welding the film which comprises the front and back of the bag main body 16. As shown in FIG. A pair of left and right handbags 22 and a pair of front and back knots 24 are formed on the upper portion of the bag body 16, and the left and right handbags 22 and the knots 24 are vertically cut by a cut portion 26 extending in the vertical direction. It is separated. The hand-held portion 22 is formed in an annular shape by connecting the upper end portions of the front and back belt-like films 22a at the welding portion 22b and separating the front and back belt-like films 22a at the windows 22c. Further, on the surface of at least one knot portion 24, a display 28 such as a usage method is printed as necessary. In addition, the display 28 such as the usage method may be printed on the bag body 16 or may be printed on both the knot portion 24 and the bag body 16. Moreover, it may be printed on both the front and back sides of the knot portion 24 and / or the bag body 16, or may be printed on either the front or back side.

  When the continuous plastic bag 10 is manufactured, first, as shown in FIG. 3A, a continuous cylindrical plastic sheet 30 is prepared, and a display 28 such as a usage method is displayed at a predetermined position of the cylindrical plastic sheet 30. Print.

  The cylindrical plastic sheet 30 is formed of a heat-weldable plastic material such as polyethylene, and in this embodiment, the cylindrical plastic sheet 30 continuously extruded from the inflation molding device is a transport roller. The display 28 is given to the printing device through the like. Note that the inflation molding process for molding the cylindrical plastic sheet 30 and the printing process for printing the display 28 may be performed separately, or the printing process is omitted when the display 28 is unnecessary. May be. The method for forming the cylindrical plastic sheet 30 is not particularly limited. For example, the cylindrical plastic sheet 30 may be formed by winding the flat sheet into a cylindrical shape and then joining both side ends of the flat sheet.

  Subsequently, as shown in FIG. 3B, the gusset 18 is formed by folding the both sides in the width direction of the cylindrical plastic sheet 30 inwardly in a valley shape. And as shown in FIG.4 (C), the welding part 22b which comprises the upper end part of the hand-carrying part 22 by thermally welding the part in which the gusset 18 of the cylindrical plastic sheet 30 was formed linearly in the width direction was formed. While forming, the bag bottom 20 is formed by heat-welding the cylindrical plastic sheet 30 linearly over the full width direction. In addition, a cutting broken line 14 is formed at the boundary between two adjacent plastic bags 12 in the cylindrical plastic sheet 30. That is, the cutting broken line 14 is formed between the welded portion 22 b and the bag bottom 20 in the cylindrical plastic sheet 30.

  When the processing of the gusset 18, the welded portion 22b, the bag bottom 20 and the broken line 14 is completed, the portion of the cylindrical plastic sheet 30 where the gusset 18 is formed is replaced with the cylindrical plastic sheet 30 as shown in FIG. The valley bottom portions 18a of the gussets 18 are arranged on both side ends in the width direction of the cylindrical plastic sheet 30 by folding on the surface of the cylindrical plastic sheet 30.

  In this embodiment, the portion where the gusset 18 is formed is folded on the upper surface of the cylindrical plastic sheet 30, but this is a display 28 printed on the lower surface of the cylindrical plastic sheet 30. This is to prevent hiding. Therefore, when the display 28 is printed on the upper surface of the cylindrical plastic sheet 30 or when there is no fear that the display 28 printed on the lower surface is hidden, the portion where the gusset 18 is formed is replaced with the cylinder. The plastic sheet 30 may be folded on the lower surface.

  When the “folding” is completed, as shown in FIG. 5 (E), the both ends in the width direction of the cylindrical plastic sheet 30 are partially punched to form a window 22 c in the valley bottom 18 a of the gusset 18. The hand-held portion 22 is formed.

  When the both ends in the width direction of the cylindrical plastic sheet 30 are partially punched at a predetermined length corresponding to the length of the hand-held portion 22, the hand-held portion 22 and the knot portion 24 are formed by the cut portions 26 formed in the punched portion. A window 22c is formed in the valley bottom portion 18a of the gusset 18 that is completely separated and left on the hand-held portion 22 side. Therefore, the entire hand-held portion 22 has an annular structure in which the front and back strip films 22a separated by the window 22c are connected at the welded portion 22b.

  When the “punching” is completed, the continuous plastic bag 10 is completed at that time, but the continuous plastic bag 10 is simply continuous in a belt shape and cannot be shipped as it is. Therefore, in the next step, as shown in FIG. 5F, the continuous plastic bag 10 is wound into a roll shape, and the end of the continuous plastic bag 10 is fixed to the surface of the roll by a seal 32 or welding.

  In a state where the continuous plastic bag 10 is wound up in a roll shape, a display 28 such as a usage method appears on the surface of the roll. Therefore, there is no need to separately prepare a packaging bag or the like with the display 28, and the cost required for packaging can be greatly reduced.

  The devices used for the above-described processes of “folding”, “thermal welding”, “cut dashed line”, “folding” and “punching” are general-purpose devices that have existed in the past, and are not special ones. Absent.

  When the plastic bag 12 is used, the plastic bag 12 is pulled out from the continuous plastic bag 10 wound up in a roll shape, and the plastic bag 12 is cut off at a cut broken line 14 as shown in FIG. When the plastic bag 12 is cut off, the portion where the gusset 18 is formed (including the hand bag portion 22) is folded over the surface of the bag body 16 and the knot portion 24. Therefore, as shown in FIG. 6 (H), the portion where the gusset 18 is formed (including the handbag portion 22) is opened to make the plastic bag 12 into its original shape, and then the plastic bag 12 is accommodated in the accommodating portion 16a. Houses purchases and garbage. At this time, when it is necessary to prevent the contents from falling off, as shown by a two-dot chain line in FIG. 2, a pair of front and back knots 24 are connected to seal the opening of the accommodating part 16a.

  When carrying the plastic bag 12, the hand can be passed through the window 22c of the handbag 22 and the hand can be hooked on the welded portion 22b constituting the upper end of the handbag 22, so Can be used in the same way.

  In the above-described continuous plastic bag 10 manufacturing method, the cut broken line 14 is processed at the same stage as the welded portion 22b and the bag bottom 20, but the step of processing the cut broken line 14 is particularly limited. It may be any stage after the cylindrical plastic sheet 30 is prepared. This is because the cut broken line 14 functions only when the plastic bag 12 is cut off, so that it does not affect the configuration or function of the plastic bag 12 even if it is processed at any stage.

Perspective view showing a continuous plastic bag Front view showing a plastic bag constituting a continuous plastic bag The perspective view which shows the manufacturing process (A) and (B) of a continuous plastic bag The perspective view which shows the manufacturing process (C) and (D) of a continuous plastic bag The perspective view which shows the manufacturing process (E) and (F) of a continuous plastic bag The perspective view which shows the use preparation process (G) and (H) of a plastic bag

Explanation of symbols

10 ... Continuous plastic bag 12 ... Poly bag 14 ... Broken line 16 ... Bag body 16a ... Storage part 18 ... Gusset 18a ... Valley bottom part 20 ... Bag bottom 22 ... Hand-carrying part 22a ... Band-like film 22b ... Welding part 22c ... Window 24 ... Knotted portion 26 ... Cut portion 28 ... Display 30 ... Cylindrical plastic sheet 32 ... Seal

Claims (2)

A method for producing a continuous plastic bag in which a plurality of plastic bags having a gusset, a handbag, a bag bottom and a knot are connected in a strip shape,
(A) preparing a continuous cylindrical plastic sheet;
(B) forming the gusset by folding the both sides of the cylindrical plastic sheet in the width direction inwardly;
(C) forming a welded portion constituting the upper end portion of the hand-carrying portion by thermally welding the portion of the cylindrical plastic sheet in which the gusset is formed in the width direction ; Forming the bag bottom of the adjacent plastic bag by thermally welding the position adjacent to the welded portion in the longitudinal direction over the entire length in the width direction;
(D) Folding the portion of the cylindrical plastic sheet where the gusset is formed on the surface of the cylindrical plastic sheet to arrange the valley bottom portions of the gusset at both ends in the width direction of the cylindrical plastic sheet;
(E) Manufacture of a continuous plastic bag in which the annular handbag and knot are formed by partially punching both ends in the width direction of the cylindrical plastic sheet to form a window at the bottom of the gusset. Method. After any of the steps (a) to (e),
(F) The manufacturing method of the continuous plastic bag of Claim 1 which forms the cutting broken line for a cutting | disconnection in the boundary part of the two said adjacent plastic bags in the said cylindrical plastic sheet.

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