JP6170235B2 - Molding shoulder for tubular bag forming machine - Google Patents

Description

  The present invention relates to a forming shoulder for tubular bag forming, filling and sealing machines.

  Such types of forming shoulders are known from the prior art. This forming shoulder is manufactured from plastic or a microstructured steel sheet. The surface characteristics of the forming shoulder and the surface characteristics of the plastic material (packaging material) to be deformed by the forming shoulder are determined by the packaging material. In order to be able to slide on a shoulder and then form a film tube from a flat web, they must be fitted together. Based on the friction generated between the packaging material and the forming shoulder, it is impossible to process a finely structured or adherent delicate packaging material without taking special measures. It has been found to be particularly inconvenient that the molded shoulder is prone to wear, particularly in the region of the deformed edge.

  According to Patent Document 1, a molding shoulder in which a plurality of holes are provided in an approach section is known. As the gas, preferably air, is supplied through the holes, an air cushion is generated between the molding shoulder surface and the packaging material (film).

  Patent Document 2 shows a molded shoulder for manufacturing a very small tubular bag. In this case, a plurality of holes are formed in the molding shoulder, and negative pressure is supplied to these holes. Here, a film of packaging material is applied to the geometric shape of the forming shoulder.

  Patent Document 3 discloses a tubular bag forming, filling and sealing machine, in which a tube with perforations for generating an air cushion is arranged at the edge of the forming shoulder. .

European Patent Publication No. 1186535 International Publication No. 2009/04998 Pamphlet Former East German Economic Patent No. 111346

  According to the invention, the entire molding shoulder and in particular the surface of the molding shoulder is made of a porous material and is divided into individual segments. Gas, preferably air, is supplied to prevent direct contact between the packaging material and the molding shoulder, in particular by the porous configuration of the molding shoulder surface and by dividing it into individual segments. Thus, the air cushion can be appropriately generated locally. Thereby, a good friction ratio can be obtained. By dividing the molding shoulder or the molding shoulder surface into individual segments, the segments are individually controlled, thus giving the possibility to properly control the packaging material web through the molding shoulder during the processing and molding of the packaging material web. It is done. In this case, web travel can be optimized and controlled, and the web load of the generated packaging material can be measured. Thus, unlike the prior art, where binary control (switch-off or switch-on) is performed, according to the present invention, it is possible to control the movement of the packaging material web in individual segments, In order to properly guide the packaging material web through the shaping shoulder, the friction ratio can be appropriately controlled.

  The dependent claims show preferred embodiments of the invention.

  According to a particularly preferred embodiment of the invention, the molding shoulder is produced by a sintering method or by a productive method such as rapid prototyping.

  The core of the present invention is therefore a molded shoulder with control and measuring functions, in particular sintered or generatively manufactured. This provides the advantage that porosity is effectively obtained in the sintered molded shoulder and can be used, for example, to generate an air cushion between the molded shoulder surface and the film. When the porous surface is distributed on the molding shoulder surface, the shape and form of the porous surface is free. Furthermore, the entire material being porous creates a direct supply path that is also gas permeable. Such a variation can also be used for generatively manufactured molding shoulders. This is because such a molding shoulder can be produced, for example, by rapid prototyping. Even in this variation, various passages for gas conveyance can be realized. Another advantage resides in that the measurement function can be realized by such a porous surface. In this case, according to the present invention, dynamic pressure measurement is possible, and the dynamic pressure measurement enables a determination regarding web force distribution and thus web load. Control of the web properties and thus the positioning of the packaging material web on the forming shoulder is likewise regarded as an advantage. In this case, the friction ratio of the molding shoulder and thus the position of the film in the molding shoulder can be controlled by the porous surface and by the air flow through this porous surface. Particularly preferably, the present invention can be used for a processing machine working intermittently. This is because an intermittently working machine cannot form a stationary action between the forming shoulder and the film. This is based on the start-up operation of such a machine.

  In accordance with a preferred embodiment of the present invention, the individual segments can also be loaded with gas via a gas supply to selectively create an action or negative pressure that acts on the surface of these segments. Or can inhale gas. Thus, in addition to selectively generating air cushions within individual segments as described above, it is also possible to hold the packaging material on the forming shoulder by negative pressure or vacuum. This is particularly suitable in the approach zone when the machine is stopped or intermittently driven.

  When using an air cushion in the area of the forming shoulder, the friction is reduced and thus the required tensile force is also reduced. Thus, for example, a packaging material that has a high coefficient of friction relative to the molded shoulder material and is difficult to process can be used. Both the packaging material and the molding shoulder have a small mechanical load. Therefore, according to the present invention, it is possible to process a packaging material having a delicate surface or structure. In addition, the service life of the forming shoulder is increased by reducing the mechanical load. Since the packaging material web can be held directly on the forming shoulder, slipping back or lateral displacement is prevented. This stabilizes the machining process and shortens the time required for start-up.

  It is particularly preferred if each individual segment is provided with at least one pressure sensor for measuring dynamic pressure or for measuring flow resistance in order to be able to carry out the control effectively and reliably. is there.

  According to the present invention, the entire surface layer can be made porous, or the entire material of the forming shoulder can be provided as a porous material. Preferably, the individual segments may be variously configured, particularly in relation to their porosity and morphology. These segments may be configured linearly or circularly in any suitable manner according to the present invention.

1 is a simplified schematic diagram of a first embodiment of a forming shoulder according to the present invention divided into segments; FIG. FIG. 2 is a view similar to FIG. 1 of another embodiment of a forming shoulder as a measuring forming shoulder according to the present invention. FIG. 5 shows an example with a partially microporous surface in the approach zone. FIG. 6 shows an embodiment having a partially microporous surface at the deformed edge. FIG. 4 is a view similar to FIG. 3 of another embodiment having a fully microporous surface in the approach zone. FIG. 5 is a view similar to FIG. 4 of another embodiment having an entirely microporous surface at the deformed edge. It is the schematic which shows the detail of the cross section of the material structure for showing an air cushion function. FIG. 8 is a view similar to FIG. 7 of an embodiment for showing a suction function.

  Embodiments of the present invention will be specifically described below with reference to the accompanying drawings.

  1 and 2 each show a schematic view of a forming shoulder according to the present invention. The forming shoulder 2 shown in FIG. 1 is divided into segments and has a total of six segments I to VI on its surface 1, and these segments are generally formed in a strip shape. Yes.

  In the embodiment shown in FIG. 2, each segment 3 is configured as a measurement segment. This means that these segments are rectangular, not strip-like, or appropriately divided to carry out the measurements used for control or adjustment via the running movement of the packaging material web. It means that

  Therefore, as described above, the present invention relates to a molded shoulder 2 manufactured by two methods. It is produced on the one hand by sintering and on the other hand by a production process, for example Rapid Prototyping.

  By such a manufacturing method, the molding shoulder 2 obtains a porous structure. The porous structure allows the forming shoulder to take on the measurement and positioning functions. The basic function of the porous structure is to reduce the friction of the forming shoulder 2 by a cushion made of air or other gas. For this purpose, the molded shoulder body consists entirely of a porous material. As described above, the core of the present invention is the measurement and positioning function assumed by the forming shoulder 2. The positioning function can be realized by dividing the molded shoulder body into segments as shown in FIG. The functional form of segment 3 can be explained by a decrease or increase in friction. In order to move the film in a direction perpendicular to the conveyance direction of the packaging material web, the plurality of segments 3 are loaded in the movement direction with a small amount of air, so the friction is increased and a lateral force that changes the web position is generated. Occur. For example, when moving in the direction of segment I, segment I and segment II are loaded with less air than the remaining plurality of segments 3. This generates a higher frictional force in segments I and II that moves the web in the direction of segment I. For this function, it is assumed that the segments 3 are separated by a gas-impermeable layer. This feature represents the control action of the forming shoulder 2 according to the invention indicated by the positioning function.

  The measurement function is possible in the configuration of the forming shoulder shown in FIG. In this case, the configuration of the molded shoulder segment has not been determined. FIG. 2 shows how segments I-VI can be divided. Depending on the required resolution, the size of these segments can be adapted. In this case, the measurement principle is measurement of dynamic pressure. In this case, two possibilities are obtained. On the one hand, the flow resistance is measured without a film (test 1), and the dynamic pressure is measured by comparing the flow resistance with a film on the segment 3 (test 2). This provides a pressure difference between Test 1 and Test 2 that is related to the web force. Another possibility is the separation of measurement and compressed air load. In this case, the segment 3 causes the film to be loaded with air, and the web force is measured by surrounding members, which are sometimes made smaller. The web force distribution in the forming shoulder 2 is obtained from the web force for each segment 3. Subsequently, a web stress distribution is derived from the web force distribution. Optionally, a predetermined segment structure that reduces the load on a predetermined region of the packaging material web in the forming shoulder 2 may be provided. According to the invention, linear or circular segments are preferred.

  3 to 8 each show various configurations and arrangements of the segments 3 on the surface 1 of the forming shoulder 2. In this case, a microporous surface is provided, which is only loaded by compressed air to form an air cushion, or that appropriately controls the movement of the packaging material film. Compressed air or negative pressure can be selectively applied to regulate.

  The surface 1 of the molding shoulder is therefore provided with a microporous coating. The microporous coating is loaded with compressed air from below through a plurality of grooves 4 under the coating. As a result, an air cushion is generated on the surface 1 and the packaging material is guided along the molding shoulder 2 in a non-contact manner. Similarly, since this surface 1 is also provided in the region of the deformation edge, the mechanical load is minimized.

  FIG. 7 shows a cross section of the molded shoulder material when generating the air cushion. Compressed air is brought underneath the microporous material through the grooves 4 and is evenly distributed by the structure of the microporous material. A thin air film is generated on the exit side of the surface 1. FIG. 8 shows a cross section in the opposite function. In this case, a vacuum is drawn through the microporous surface 1.

  The configuration of the microporous surface may be formed entirely or partially. Similarly, the areas of air cushion generation or vacuum suction function, respectively, may be provided partially or fully, or omitted.

  3 and 4 show, for example, a partial coating with a microporous material, in which case FIGS. 3 and 5 show views similar to FIGS. 1 and 2, whereas FIGS. FIG. 6 shows views of FIGS. 3 and 5 as seen from below. Additional vacuum suction is possible in the region outside the approach zone. Thereby, the packaging material is fixed to the molding shoulder.

  In the examples of FIGS. 5 and 6, a full coating with a microporous material is shown. Again, the vacuum zone is shown only in the outer edge region.

  The molded shoulder according to the invention can be used both in vertical tubular bag machines as well as in horizontal tubular bag machines, in which case it is particularly suitable for packaging materials that are difficult to process or microstructure. I found out. When used in tube bag packaging machines, vertical molding, filling and sealing machines are also included.

1 Surface 2 Molded shoulder 3 Measurement segment 4 Groove I to VI segment

Claims (7)

In forming shoulder adult form machinery tubular bag,
Said forming shoulder (2) comprises a plurality of segments (3) separated from each other by a gas-impermeable layer ;
Each of the plurality of segments (3) is provided with a gas permeable gas supply part, and an air cushion or negative pressure acting on the surface of the molding shoulder (2) by gas load or suction through the gas supply part. A forming shoulder for a tubular bag forming machine, characterized in that at least one sensor for individually controlling each segment (3) is provided . The forming shoulder according to claim 1, characterized in that the forming shoulder (2) is manufactured by a sintering method. 3. Molding shoulder according to claim 1 or 2, characterized in that the molding shoulder (2) is manufactured by a generative method. The sensor is characterized in that a pressure sensor for measuring or flow resistance for measuring the dynamic pressure, forming shoulder according to any one of claims 1 to 3. Characterized in that the shaping shoulder (2) has a surface layer of the porous molded shoulder as claimed in any one of claims 1 to 4. Whole is characterized by being composed of a porous material, molding the shoulder according to any one of claims 1 to 4 of the forming shoulder (2). The forming shoulder according to any one of claims 1 to 6 , characterized in that at least one of the segments (3) is configured linearly or circularly.

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