FI69032C - FOERPACKNINGSPAOSE OCH FOERFARANDE FOER DESS FRAMSTAELLNING - Google Patents

Description

1 69032

Packaging bag and method of making it.

The packaging and the fitting of the packaging.

The invention relates to a packaging bag made of cardboard, the height of which is substantially greater than the width and whose narrow side is open and forms an opening of the package, one end of which has a closing flap which can be turned over the opening to the other side of the package to close the mouth.

Such a packaging bag is known from the applicant's FI patent publication 65591. In it, a support board which gives rigidity to the package is enclosed between layers of paper coming on both sides of the board. In this case, a high-quality packaging bag is obtained, which can be produced on an automatic machine at a high production speed. However, the paper used is even more expensive per unit area than cardboard. As a result, the material cost of the packaging becomes relatively high.

The object of the present invention is to provide a packaging bag which serves a similar purpose and whose material costs remain substantially lower.

This object is achieved by a packaging bag according to the appended claim 1, which can be produced by the method according to claim 2 at a high production speed in an automatic machine.

In the following, the invention will be described in more detail with reference to the accompanying drawings, in which Fig. 1 shows a package according to a first embodiment of the invention in a perspective view and Fig. 2 69032 Fig. 2 shows a package according to a second embodiment of the invention in a perspective view.

Figures 3-5 show the different manufacturing steps of the package corresponding to the embodiment of Figure 1. The same manufacturing steps also apply to the embodiment of Fig. 2, the only difference being that in the initial situation of Fig. 3, the longer cardboard sheet 1 is placed on top of the shorter cardboard sheet 2.

The height of the packaging bag is substantially greater than the width and one of its narrow sides is open and forms the mouth of the package. Protruding from the other edge of the mouth opening is a closure flap 4 which can be pivoted over the mouth opening onto the other side of the package to close the mouth opening.

The package consists of two separate cardboard sheets 1 and 2, of which the width of the cardboard sheet 1 corresponds to the width of the package and the length is more than twice the height of the package. The cardboard plate 1 is bent twice by a bending line 5 which forms the bottom of the packaging bag.

The length of the second cardboard sheet 2 corresponds to the height of the package, i.e. the length of the shorter bent half of the cardboard sheet 1. The width of the cardboard sheet 2 is substantially greater than the width of the package, and the side edge areas 3 exceeding the width of the package are bent around the side edges of the shorter bent half of the cardboard sheet 1 and glued to the outer surface of the cardboard sheet 1. The central area of the cardboard plate 2 is glued to the inner or outer surface of the longer bent half of the cardboard plate 1. In the case of Figure 1, the attachment is made to the inner surface and in the case of Figure 2 to the outer surface.

Since the high side edges of the packaging bag are closed by the bent edge areas 3 of the cardboard sheet 2 3 69032 attached to the outer surface of the cardboard sheet 1, only the shear joint is applied would cause intense tension on the side edges of the package. The cardboard material itself is sufficiently tough against tearing at the side edges of the package.

The package shown can be manufactured at a high production rate by a method, the principle of which is clear from Figures 3, 4 and 5. The starting materials are two bad webs on a storage roll, one of which is slightly wider than the other. The narrower web is drawn at more than twice the speed of the wider one. Rectangular cardboard sheets are cut from both webs so that the sheets 1 cut from the narrower web are more than twice as long as the sheets 2 cut from the wider web. 1 extends to both sides of the shorter plate 2, the extension to the other side substantially corresponding to the length of the shorter plate 2. The side edges 3 of the shorter plate extend on both sides of the side edges of the longer plate 1. Thereafter, the longer plate 1 is bent twice at the edge of the shorter plate 2 according to the manufacturing step shown in Fig. 4 along the bending line 5 which forms the bottom of the finished packaging bag. Next, the side edge areas 3 of the shorter plate 2 are bent around the side edges of the bent portion of the longer plate 1 and fixed with glue to the outer surface of the bent portion of the plate 1.

There is no need to cut waste pieces at all, the post-processing of which would cause extra work. Cardboard material 4 69032 is relatively cheap compared to e.g. paper. Although the side wall of the packaging bag 1 is made of double cardboard, this is not a substantially cost-increasing factor given the relatively cheap price of the cardboard. On the other hand, the double wall makes the package rigid and sturdy and provides good protection for the goods to be packed.

On the other hand, a substantially reducing material cost is that the narrower paperboard 1, which is relatively more abrasive, is so narrow that it is available from edge waste cut to certain cardboard widths during the manufacture of paperboard, which has not previously been efficiently utilized in the packaging industry.

Claims (2)

5,69032 A packaging bag made of cardboard, the height of which is substantially greater than the width and one narrow side of which is open and forms an opening of the package, one end of which has a closing flap (4) which can be turned over the opening to the other side of the package to close the mouth. the second side of the package made of cardboard (1, 2) consists of two overlapping cardboard layers, the end area of the second cardboard layer forming said closure flap (4) and the side edge areas (3) of the second cardboard layer bent around the high side edges of the package and attached to the outside. A method of manufacturing a package according to claim 1, characterized in that two rectangular cardboard sheets (1, 2) are cut, one of which is more than twice the length of the other and of which the shorter sheet (2) is substantially wider, an adhesive is applied to the sheets. (1, 2) on opposite surfaces and the plates are stacked so that the longer plate (1) extends on both sides of the shorter plate (2) so that the extension to the other side substantially corresponds to the length of the shorter plate (2) and the side edges (83) of the shorter plate extend on both sides of the side edges of the longer plate (1), then the longer plate (1) is bent twice at the edge of the shorter plate (2) along the bending line (5) forming the bottom of the package, the side edge areas (3) of the shorter plate (2) are bent longer around the side edges of the bent part of the plate (1) and is glued to the outer surface of the bent part of the longer plate (1).