JP6352410B2 - Valve bag - Google Patents

Description

  The present invention has a standing bottom, preferably a cross bottom or a block bottom, and a valve bottom disposed opposite the standing bottom and into which a valve hose is inserted to fill the valve bag, the valve hose comprising a thermal material and The present invention relates to a valve bag for a bulk material such as cement, gypsum, powder, animal feed, etc., which is formed from a carrier material that encloses the thermal material.

  Such valve bags are typically made from paper and are widely known and widely used commercially for fine bulk materials such as cement, gypsum, powder, animal feed etc. Has been. Standard sizes in this regard are 5 kg, 10 kg and 25 kg.

  The valve bottom has a heat valve such as a hose whose inner surface is coated with a hot-melt material and can be melted by a thermal action to close the valve hose. The thermal material, however, does not provide any sufficient rigidity and strength to allow the valve hose to be plugged into the filling nozzle of the filling plant. A piece of paper is additionally placed around the thermal material for this purpose of reinforcement.

  A corresponding valve bottom is depicted in FIG. The figure shows the valve bottom 2 of the valve bag 1 folded to the front side of the valve bag 1. The valve bottom 2 is open to show the valve structure. The overall valve bag 1 has a cross-bottom fold.

  The valve 5 has a thermal material 6 which substantially forms the inner surface of the valve hose and is bonded to the carrier material 7. It can be confirmed that the thermal material 6 has a larger area ratio than the carrier material 7. In particular, the thermal material region projects beyond the inner end of the carrier material 7 in the axial valve direction, i.e. in the direction of the valve end located on the inside. Therefore, the thermal material 6 forms a main component of the valve hose 5, and the relatively high unit price of the thermal material 6 leads to a high manufacturing cost of the valve hose 5 and the valve bag 1.

  The object of the present invention is to optimize the cost ratio of the materials used and to reduce the overall cost for the manufacture of a valve bag with a thermal valve.

  This object is achieved by a valve bag with the features of claim 1. Advantageous embodiments of the valve bag are the subject of the dependent claims.

  A reduction in manufacturing costs will be realized by a reduction in the required thermal material. According to the invention, the area ratio of the thermal material is thus selected to be small compared to the area ratio of the carrier material.

  The part of the thermal material is ideally shorter than the part of the carrier material in the axial valve direction. The larger material ratio of the resulting valve hose is thereby largely determined by the natural carrier material, in particular paper. Chemically processed and typically high cost thermal materials thus only take a smaller material ratio. Manufacturing costs can thereby be reduced, which is particularly noticeable in high volume products. The desired valve characteristics, in particular its tightness and handling, can be ensured regardless of the change in the material ratio of the individual valve components.

  Particularly preferably, the thermal material is shortened relative to the prior art embodiments, while the support material is expanded accordingly. The resulting total valve length is maintained by offsetting the shortening / expansion of the valve material. This is particularly desirable with respect to backward compatibility with existing filling plants.

  The portion of thermal material is preferably shortened near the inner end of the valve hose. Because the portion of thermal material and the portion of carrier material are typically rectangular shapes whose length defines the edge of the valve hose and whose width determines the valve length, shortening of the thermal material is a portion of the thermal material. This is done by reducing the width in the axial valve direction. The area ratio is reduced particularly in the region of the end of the valve hose arranged inside the valve bag body.

  It is particularly advantageous that the resulting valve hose has a substantially constant strength or stiffness in the axial direction. A constant strength is desirable and necessary to prevent breakage after plugging the valve hose into the filling nozzle of the filling plant and subsequent pulling with an inflatable cuff.

  A certain strength has heretofore been ensured by using a thermal material as the main component of the valve hose. In the variant according to the invention, it is appropriate to design the protruding region of the carrier material as reinforced so that it can nevertheless guarantee a certain strength in the axial valve direction.

  It is possible to apply additional reinforcements to the protruding areas. However, it is more preferred to fold the carrier material in the protruding region, in particular over the entire width, ie over the entire valve edge of the inner valve end. The strength in this region is improved by the folding of the carrier material, in particular doubled. A generally constant strength is thereby realized in a particularly simple manner over the entire length of the valve. In addition, improved backward compatibility with existing filling plants can be realized in a simple manner.

FIG. 1 is a schematic view of a valve bag according to the prior art. FIG. 2 is a schematic view of a valve bag according to the present invention. FIG. 3a shows a first example of folding of the carrier material of the valve bag according to the invention. FIG. 3b shows a first example of folding of the carrier material of the valve bag according to the present invention. FIG. 4a shows a second example of folding of the carrier material of the valve bag according to the invention. FIG. 4b shows a second example of folding of the carrier material of the valve bag according to the present invention.

  Hereinafter, further advantages and characteristics of the present invention will be described with reference to embodiments shown in the drawings.

  FIG. 2 shows a valve bag 10 according to the invention with a shortening according to the invention of the thermal material used. Compared with the modified valve hose, the valve bag design substantially corresponds to the solutions known from the prior art.

  The figure shows a valve bag 10 according to the present invention having a standing bottom 20 folded forward and a valve bottom 30 at the upper end. Both bottoms 20 and 30 are connected to each other via a front surface 40 and a rear surface (not shown), and are folded in a cross bottom manner. The valve bottom 20 is not folded and closed, but is open to show the valve structure.

  In the same manner as in the prior art, the valve hose 50 protrudes beyond the upper and lower ends of the valve bottom 20 on the left valve bottom side. The valve hose 50 is also composed of a thermal material 60, for example a weldable plastic material, and a carrier material 70, for example paper, which forms the inner surface of the valve hose 50, the carrier material 70 being heat Wrapping material 60. With this valve hose 50, the valve bag 10 can be inserted into a filling nozzle of a filling machine for filling. After the filling process, the thermal valve 50 is melted, for example by the effect of ultrasonic energy, thereby ensuring that the valve hose 50 is closed.

  The ratio of the valve material 60, 70 used has been changed relative to the known embodiment of FIG. 1 to reduce the unit price per valve bag 10 that is manufactured. According to the invention, the main components of the valve hose are formed by the natural carrier material 70. The large material ratio of the chemically treated thermal material 60, which is generally a weldable plastic material, has been reduced.

  Both the carrier material 70 and the thermal material 60 have a rectangular shape extending so that the long sides intersect the axial direction of the valve hose 50. FIG. 2 shows the valve bottom 20 in an open state. The valve hose 50 is formed by a rectangular material 60, 70 that is folded over the length by folding the valve bottom 20.

  In order to save product costs, the width of the thermal material 60 is shortened and the carrier material is also expanded. The total valve length Y has not changed due to equal shortening / expansion of the valve material 60,70. Nevertheless, a considerable part of the thermal material 60 is saved, which not only provides economic advantages, but also reduces the energy required for the production of the thermal material and its waste, for example, It also makes sense in terms.

  In order to ensure that the strength of the valve hose 50 is as constant as possible over the entire valve length Y, the protruding region X of the carrier material 70 is free of thermal material 60 that contributes to reinforcement, so It is advantageously reinforced. In the particular embodiment of FIG. 2, the protruding region X of the carrier material 70 is folded to provide sufficient strength in this region for this purpose. A double-layer carrier material 70 having approximately the same strength as the laminated region of the thermal material 60 and the carrier material 70 is obtained by folding an area not covered with the thermal material. Of course, the carrier layer 70 may also be folded several times.

  Figures 3a, 3b, 4a and 4b show by way of example the possibility of carrying out the folding of the carrier material 70 described above. FIG. 3b shows a cross section of the carrier material 70 and the thermal material 60 along the line AA in FIG. 3a. As shown in FIG. 3 b, the carrier material 70 is folded down in the carrier material protruding region X, ie, away from the thermal material 60. The carrier material is stacked in two layers, so that it is reinforced by folding in the protruding region X.

  4a and 4b show different embodiments of folding, and FIG. 4b again shows a cross-section along the line AA of FIG. 4a. As can be seen in FIG. 4 b, the carrier material 70 is folded up in the protruding region X, ie on the side facing the thermal material 60. At the same time, the fold is depicted in a manner that slightly overlaps the thermal material 60. Alternatively, it is also possible to fold the carrier material and the thermal material 60 in such a manner that they abut or in a manner that slightly overlaps the thermal material 60.

Claims (5)

A valve bag (10) for bulk material such as cement, plaster, powder, animal feed, etc.,
Standing bottom (30 ) ,
A valve bottom (20) disposed opposite the standing bottom (30) and into which the valve hose (50) is inserted to fill the valve bag (10);
The valve hose (50) is formed from Nde packaging and thermal material (60) forming the inner cylindrical body to heat the material (60) with a carrier material to form the outer tubular body (70),
Area ratio of the heat material (60) is rather smaller than the area ratio of the carrier material (70),
The valve hose (50) has a substantially constant strength in the axial direction because the carrier material (70) is folded and reinforced in a region protruding from the thermal material (60). and it has <br/> that valve bag according to claim. In claim 1,
The valve bag, wherein the portion of the thermal material in the axial valve direction is shorter than the portion of the carrier material. In claim 2,
A valve bag, characterized in that the portion of the thermal material in the region of the end of the valve hose facing the interior of the bag is shortened compared to the carrier material (70). In any one of Claims 1-3,
The carrier material (70) is a valve bag, characterized by being Nde contains natural materials. In any one of Claims 1-4 ,
A valve bag, characterized in that the carrier material (70) is folded at all valve edges at the valve end facing the interior of the bag.