Method for producing a material hose

Abstract

The invention relates to a method for producing a material hose from at least one material web, in which a first material web is unwound from a first material web roll, a second material web roll having a second material web is provided, fixing the advancing end of the second material web to the first material web in a fixing region by means of a fixing device, assigning a weakening line to the first and / or second material web by means of a perforating or cutting device arranged downstream of the fixing device, the weakening lines occupy the same distance in particular from each other,-wherein the fastening region is arranged in a region of the first material web between two weakening lines to be introduced or introduced next.

Description

Technical Field

[0001] The invention relates to a method for producing a material hose according to claim 1 . Background Art

[0002] To produce bags or sacks, it is necessary to produce a hose from a first material web (the first material web being a flat web) by flanging its side edges in the direction of the web's centerline within the hose's formation, so that the side edges overlap. The side edges are then bonded together along this overlap, creating a continuous hose. However, if the hose is to be divided into hose segments in order to produce individual bags or sacks from them, these segments can be severed using a cutting device. However, if the upper and lower layers of the hose are not to be separated at the point where they overlap, it is necessary to perforate the material web using a perforating device before the hose is formed. After the hose is formed, the hose can then be pulled in opposite directions on either side of this perforation, causing it to tear along the perforation. Within the context of this disclosure, the cut or perforation can be generally referred to as a line of weakness.

[0003] After a certain time, the first material web that is unrolled from the first material web roll will end. This means that the material web roll is almost fully unrolled.

[0004] For the further production of the hose, a second material web reel comprising a second material web is usually provided.

[0005] Subsequently, the forward end of the second material web is fixed to the first material web in the fixing region by a fixing device. The fixing device is usually located upstream of the perforating or cutting device.

[0006] For this purpose, it is usually necessary to slow down the transport speed of the first material web and the second material web, partly to a standstill. Summary of the Invention

[0007] The object of the present invention is therefore to provide a method in which the second material web can be fixed to the first material web at a higher transport speed of the first material web without this causing further problems.

[0008] According to the invention, this object is achieved by all the features of claim 1. Possible embodiments of the invention are described in the dependent claims.

[0009] According to the present invention, it is provided that:

[0010] Unwinding the first material web from the first material web roll,

[0011] providing a second material web roll having a second material web,

[0012] fixing the leading end of the second material web to the first material web in the fixing region by means of a fixing device,

[0013] providing the first and / or second material web with lines of weakness by means of a perforation or cutting device arranged downstream of the fixing device, said lines of weakness in particular each occupying the same distance relative to one another,

[0014] In this case, the fastening region is arranged in a region of the first material web between two subsequently introduced lines of weakness.

[0015] The second web roll is preferably in contact with a drive that sets it into rotational motion. The leading end of the second web is then guided by a guide into the area of the first web. An adhesive element, such as a double-sided adhesive film or a coated adhesive, is applied to the first and / or second webs. The leading end of the second web and the first web are then pressed against each other to maintain their adhesion. The webs adhere to each other at the following surface, which is considered the attachment area.

[0016] For continuous hose production, it is essential that the perforating or cutting device be arranged downstream of the fixing device, as otherwise it would be impossible to feed the second material web to the perforating or cutting device. The perforating or cutting device introduces one or more weakening lines extending in the transverse direction into the first material web. A portion of the weakening line can also extend at least partially in the longitudinal direction. However, it is important that at least one path along the weakening line extends across the entire width of the material web. In particular, the two directly successive paths of the weakening line, which define the subsequent hose section, are spaced at equal distances from one another in the conveying direction to achieve uniform hose section lengths.

[0017] Furthermore, according to the invention, the fixing region is between two successive weakening lines which are introduced only subsequently as already described. This means that the weakening lines do not contain parts of the fixing region or do not overlap with them.

[0018] This ensures that the line of weakness can be introduced without being disrupted by the securing area. The tools of the perforating or cutting device are also unlikely to become contaminated by the adhesive element. Furthermore, when the hose is subsequently divided into hose segments, it is prevented from being torn apart along the securing area rather than along the line of weakness. Typically, the tools act on the hose on both sides of the line of weakness, with the relative movement of the two tools, for example due to different circumferential speeds of the roller pairs, causing the hose segments to be torn off the hose. However, if one tool now acts only on the first material web and the second tool only on the second material web, the torn-off process could occur along the securing area.

[0019] Advantageously, the first material web is cut upstream by a trimming die so that only a short label of the first material web remains after the fastening section. This short label is preferably dimensioned so that it lies completely within the region between two subsequent lines of weakness to be introduced or introduced. However, if the subsequent hose section is short, provision can be made for this label to also extend beyond the subsequent line of weakness (and only within the region of the subsequent line of weakness), with the end of the label again lying between the two lines of weakness.

[0020] In a refinement of the method according to the present invention, the securing region is provided at a predetermined distance from the preceding weakening line in the transport direction of the material web. This means that, in order to position the securing region according to the present invention between two weakening lines, the securing region is arranged at a predetermined distance from the respective preceding weakening line, wherein this distance is determined independently of the distance between two adjacent weakening lines. This ensures that the securing region does not overlap the preceding weakening line of two successive weakening lines. The distance is preferably selected such that it is less than the smallest possible distance between two successive weakening lines. This smallest possible distance is generally determined by the geometric properties of the cutting or perforating device.

[0021] Advantageously, before the second material web is secured to the first material web, the leading end of the second material web or a marking on the second material web is positioned at a predetermined angular position relative to a vertical plane extending through the axis of rotation of the material web roll containing the material web. Two possible approaches are contemplated. On the one hand, a material web may be provided that carries an imprint, such as an advertising imprint or customer information, necessitating the proper registration of the second material web on the first material web. A registered trademark associated with this imprint or a component of the imprint itself may represent the marking. If such a marking is not present, the leading end of the second material web must be positioned, representing a second possible positioning approach. Positioning can be performed manually or using a sensor that has already assumed a fixed position. For manual positioning, a positioning aid, such as a ruler, may be provided. Positioning requires rotating the second material web roll, which can be performed using a roll drive or manually. The roll is rotated by the drive until a sensor or operator stops the drive upon reaching the desired angular position. The arrangement of the fastening region according to the invention is simplified by suitable positioning.

[0022] It is provided that the diameter of the second material web roll is determined before the second material web is fastened to the first material web. This diameter determination can again be performed manually or automatically. Advantageously, given precise knowledge of the diameter of the material web roll, a rotational speed can be set for the material web roll, which results in a web speed for the leading end of the other material web that corresponds to the transport speed of the first material web, thereby enabling a simple arrangement of the fastening region at the desired location.

[0023] In a preferred embodiment for diameter determination, a rolling element with a known circumference is placed on the circumferential surface of the second material web roll. The total rotation angle of the rolling element and the total rotation angle of the shaft supporting the second material web roll are determined between a starting time and an ending time, with the material web roll being rotationally driven. The rolling element with a known circumference thus rolls on the circumferential surface of the material web roll, with the total rotation angle of the rolling element being measured. In particular, it is provided that the rolling element can be driven by a drive motor and used to drive the material web roll. In this case, the rotation angle can also be determined in or on the motor using a rotation angle sensor known per se. The rotation angle of the shaft supporting the second material web roll is also determined. For this purpose, the shaft can be provided with at least one detectable element, such as a magnet, which can be detected by a magnetic sensor. Thus, at any starting time, the material web roll can be set into rotational motion and stopped again at the ending time. The end time is preferably the time at which the shaft supporting the second material web roll has just rotated 360 degrees in order to optionally maintain the previous position of the web start or mark. The diameter of the material web roll is now calculated from the total rotation angle of the rolling element, its diameter and the total rotation angle of the shaft.

[0024] Another advantageous step provides for calculating the length of the web path between the end of the forward run of the second web or the marking on the second web and the securing device based on the specified angular position of the end of the forward run of the second web or the marking on the second web and the circumference of the second web. The securing device preferably includes a pressure roller, via which the first web is moved at least during the period before the second web is secured to the first web. This pressure roller can be used to move the first web close to the second web and bring it into contact, thereby connecting the second web to the first web in the securing section. In this case, the contact point of the pressure roller is calculated and essentially depends on the outer circumference of the second web roll. Therefore, the web path in this case is an arcuate section along the outer circumference of the web roll. However, it is also possible to guide the forward end of the second web to the securing device along the web path using a guide. This guide path also depends on the outer circumference of the second web roll. This calculation can therefore provide an acceleration path for the second material web roll.

[0025] In a further step, it is preferred to calculate the acceleration required to accelerate the second web reel from the web travel and web speed of the first web so that the end of the forward run of the second web or the marking on the second web has essentially the same transport speed as the first web at the location of the fastening device. In particular, provision is made for the forward run of the second web to have already reached the transport speed of the first web, with the rotation angle of the second web reel preferably being less than 360 degrees. This allows for the shortest possible acceleration travel and an improved arrangement of the fastening region on the first web.

[0026] Furthermore, it is preferred to calculate the relative starting time for accelerating the second material web as a function of the web speed of the first material web and the length of the web path of the first material web between the fastening device and the time at which the weakening line is introduced into the first material web. This provides the reciprocating times at which the second material web roll must be set in motion so that the fastening section assumes the desired position on the first material web roll.

[0027] In a final advantageous step, a start signal is provided for starting the second material web roll, wherein acceleration of the second material web roll begins at the next relative start time after the time of the start signal. This start signal can be provided by an operator. However, it is also advantageous to regularly determine the remaining length of the first material web on the first material web roll and / or the diameter of the first material web roll and to provide a start signal when this falls below a threshold value. This can preferably be performed by a computing and control unit.

[0028] The aforementioned object is also achieved by a device for carrying out the method described above, wherein the device according to the invention is designed at least:

[0029] a first unwinding station, in which a first material web can be unwound from a first material web reel,

[0030] a second unwinding station, in which a second material web roll with a second material web can be provided,

[0031] a fixing device, with which the leading end of the second material web can be fixed to the second material web in a fixing region,

[0032] a perforating or cutting device arranged downstream of the fixing device, with which the first and / or second material web can be provided with weakening lines, which in particular each occupy the same distance relative to one another,

[0033] The fixing region can be arranged in this case in a region of the first material web between two subsequently introduced lines of weakness.

[0034] The device according to the invention achieves the same advantages as those already described in conjunction with the method according to the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Further advantages, features, and details of the present invention are apparent from the following description, in which various exemplary embodiments are explained in detail with reference to the accompanying drawings. The features mentioned in the claims and in the description may be essential to the present invention individually or in any combination thereof. Within the scope of the entire disclosure, features and details described in conjunction with the method according to the invention also apply in conjunction with the device according to the invention, and vice versa, so that reference is always made to each other or can be made to each other with respect to the various aspects of the present invention. The individual drawings are shown below:

[0036] Figure 1 shows a side view of the deployment device;

[0037] Figure 2 A side view of the unwinding device during determination of the circumference of the second material web roll is shown;

[0038] Figure 3 A side view of the unwinding device is shown during the fastening of the second material web to the first material web. DETAILED DESCRIPTION

[0039] Figure 1The unwinding device 100 is shown, in which a first material web reel 101 is rotatably mounted in an auxiliary bearing. A first material web 102 is unwound from this first material web reel 101 and guided out of the unwinding device along a transport path or web path, as indicated by the arrow x. The material web is then conveyed to a tube forming station, where it is formed into a material tube as described in detail above. The material web reel 101 has already been transferred from the main bearing to the auxiliary bearing, as the main portion of the first material web 102 has already been unwound, and a second material web is connected to the first material web 102 to ensure a continuous supply of material webs.

[0040] In the unwinding device, the first material web 102 is guided by different deflecting drums 103, 104, wherein the deflecting drum 103 is a component of a fixing device not explained in detail. The fixing station can also be designed in other ways, and the deflecting drum is not a mandatory component.

[0041] Further along the web path, the material web 102 passes through a cutting or perforating station, where at least one incision or at least one perforation is provided at regular intervals. The following description of the cutting or perforating station represents only one embodiment; other embodiments can also be provided at the same location. The material web 102 is guided by a counter roller 110. A perforating and / or cutting roller 111 carries a cutting or perforating blade 112. As the roller 111 rotates, the cutting or perforating blade 112 comes into contact with the material web at regular intervals, thereby providing the material web with incisions and / or perforations at regular intervals. To enable the spacing of the incisions and / or perforations to be varied, the perforating and / or cutting roller can be rotated at varying speeds during the time periods when the blades 112 of the perforating and / or cutting roller are not in contact with the material web, thereby extending or shortening the operating time. Additionally or alternatively, the distance of roller 111 from counter roller 110 can be varied, wherein knife 112 is replaced by a knife whose blade is at a greater or lesser distance from the axis of rotation of roller 111 than the replaced knife. In this case, it is possible to always operate the blade of knife 112 at a circumferential speed corresponding to the transport speed of the material web.

[0042] Based on the operating speed of the knife blade, the length of the web path and the conveying speed of the material web 102, it is possible to calculate with the help of a calculation and control device (not shown) at which point in time the part of the material web that is later provided with at least one incision and / or perforation passes the deflection drum 103.

[0043] exist Figure 1, a second material web roll 121, onto which a second material web 122 is wound, is shown already inserted into the main bearing area. In one method step, second material web roll 121 is positioned so that the leading end of second material web 122, also referred to as web start 123, occupies a known angle α relative to a plane 124, wherein the plane extends through the axis of rotation of material web roll 121 and is preferably oriented vertically, with "vertical" referring to the plane on which the unwinding device is arranged. Instead of web start 123, a marking (not shown) on the second material web can also be positioned relative to plane 124. Such a marking could, for example, be part of an embossing or a registered trademark.

[0044] Now, Figure 2 Shown with Figure 1 In a similar situation, essentially identical elements can be seen, which are again not designated with reference numerals for greater clarity. An additional component is the drive disc 125 of the drive device, which acts on the outer circumference of the second material web roll 121. To determine the diameter or circumference, the second material web roll is set into rotational motion by the drive disc 125 and rotated through a specified rotational angle, preferably 360 degrees, as indicated by the arrow R. The magnitude of this rotational angle is determined via a shaft 126 supporting the second material web roll 121. To this end, the shaft carries a marking element, such as a magnet, an indentation, or a sticker, which is detected by a suitable sensor, such as a magnetic sensor or an optical sensor. The circumference of the second material web roll 121 is calculated from the magnitude of the rotational angle, the total rotational angle of the drive disc during the rotational motion of the second material web roll, and the known circumference of the drive disc.

[0045] From this circumference value, the angular position of the deflecting drum's contact line 130 relative to the plane 124 and thus to the angular position of the web start 123 can also be calculated when the deflecting drum 103 is pivoted along the arrow S onto the second material web roll 121 .

[0046] From the aforementioned angular position difference and the circumference of the second material web roll 121, a calculation is performed to determine the circumferential arc that the web start must traverse in order to come into contact with the first material web. This circumferential arc also represents the acceleration path within which the second material web roll must be accelerated, in particular from a stationary state, so that the web start assumes the transport speed of the first material web when it comes into contact with the first material web. The circumferential arc can be less than 360 degrees, but it can also encompass an angle greater than 360 degrees.

[0047] From the duration of this acceleration, the time at which the points of the first material web are subsequently provided with incisions and / or perforations, and the offsets provided with respect to these incisions and / or perforations, mathematical relationships known to those skilled in the art are used to calculate the starting times at which the second material web roll must be set into rotation so that the web start of the first material web roll touches the first material web at the previously specified distance from the subsequent incisions and / or perforations. To secure the second material web to the first material web, the second material web is already provided with a connecting element 131, such as a double-sided adhesive tag, near the web start.

[0048] Now, the actual fixing process is Figure 3 . In particular, if the first web roll has fallen below a specified minimum diameter and / or the machine operator has set a start signal, the second web roll is set into motion at the nearest possible start time and accelerated according to the previously calculated necessary acceleration. The deflection drum carrying the first web is pivoted onto the second web roll, thereby establishing contact between the first and second web rolls. Subsequently, upstream of the deflection drum 103, the web 102 is severed by a not-shown severing device at a separation point upstream of the securing region where the second web is secured to the first web. After the second web is secured to the first web by the connecting element 131, the web is unwound from the second web roll and subsequently perforated and / or cut by a cutting and / or perforating blade. The previously performed adjustments and the selected start time prevent the cutting and / or perforating blade 112 from hitting the securing region and, in particular, the connecting element 131.

[0049]

Claims

1. A method for producing a material hose from at least one material web, wherein Unwinding the first material web from the first material web roll, providing a second material web roll having a second material web, fixing the leading end of the second material web to the first material web in a fixing region by means of a fixing device, providing the first and / or second material web with lines of weakness by means of a perforation or cutting device arranged downstream of the fixing device, the lines of weakness in particular each occupying the same distance relative to one another, The fixing region is arranged in a region of the first material web between two weakening lines to be introduced subsequently or to be introduced.

2. The method according to claim 1, It is characterized by: The fastening region is at a defined distance from the preceding weakening line in the transport direction of the material web.

3. The method according to any one of the preceding claims, It is characterized by: Before the second material web is fixed to the first material web, the leading end of the second material web or a mark on the second material web is brought into a specified angular position relative to a vertical plane extending through the axis of rotation of the material web roll including the material web.

4. The method according to any one of the preceding claims, It is characterized by: The diameter of the second material web roll is determined before the second material web is fastened to the first material web.

5. The method according to the preceding claim, It is characterized by: In order to determine the diameter, a rolling element with a known circumference is placed on the circumferential surface of the second material web roll, wherein the total rotation angle of the rolling element and the total rotation angle of the shaft supporting the second material web roll are determined between a start time and an end time, wherein the material web roll is driven in rotation.

6. The method according to any one of the preceding claims, It is characterized by: The length of the web path between the end of the preceding run of the second material web or the marking and the fixing device is calculated from the specified angular position of the end of the preceding run of the second material web or the marking on the second material web and the circumference of the second material web.

7. The method according to the preceding claim, It is characterized by: The following acceleration is calculated from the web path and web speed of the first material web, with which the second material web reel must be accelerated so that the forward end of the second material web or the mark on the second material web at the position of the fixing device essentially assumes the same transport speed as the first material web.

8. The method according to any one of the preceding claims, It is characterized by: The relative starting time for accelerating the second material web is calculated as a function of the web speed of the first material web and the length of its web path between the fixing device and the time at which the weakening line is introduced into the first material web.

9. The method according to the preceding claim, It is characterized by: A start signal is given for starting the second material web roll, wherein acceleration of the second material web roll begins at a next relative start time after the time at which the start signal is given.

10. A device for implementing the method according to any one of claims 1 to 9, comprising: a first unwinding station, in which a first material web can be unwound from a first material web reel, a second unwinding station, in which a second material web roll with a second material web can be provided, a fixing device, with which the leading end of the second material web can be fixed to the first material web in a fixing region, a perforating or cutting device arranged downstream of the fixing device, with which the first and / or second material web can be provided with weakening lines, which in particular each occupy the same distance relative to one another, ·in, The fixing region can be arranged in a region of the first material web between two subsequently introduced lines of weakness.

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