DE202022100165U1 - Device for the subsequent foaming of foils - Google Patents

Abstract

Device for subsequent foaming of films, a first pinch roller and a second pinch roller, the first pinch roller being above the second pinch roller, a heating box provided between the first pinch roller and the second pinch roller being provided with a heating element, the first pinch roller a first fuser roller and a first floating roller, the first fuser roller and the first floating roller being parallel to one another and their vertical positions aligned, the position of the first fuser roller being stationary, the first fuser roller having a first motor for driving its rotation and further comprising a first horizontal cylinder that drives the first idler roller in the horizontal direction, the first horizontal cylinder driving the first idler roller away from or near the first fuser roller;
wherein the second tension pinch roll comprises a second fuser roll and a second idler roll, the second fuser roll and the second idler roll being parallel to one another and their vertical positions aligned, the position of the second fuser roll being stationary, the second fuser roll having a second motor for driving its rotation and further provided with a second horizontal cylinder driving the second idler roller in the horizontal direction, the second horizontal cylinder driving the second idler roller away from or near the second fuser roller;
characterized in that the second horizontal cylinder is a double stroke cylinder, the double stroke cylinder comprising two strokes to space the second floating roller two different distances apart, the second floating roller being far away from the second fixer roller when the double stroke cylinder is in a fully retracted state is located, wherein the second loose roller is closer to the second fuser roller with a gap therebetween when the first stroke is realized by the double stroke cylinder, wherein the second loose roller abuts the second fuser roller when the second stroke is realized by the double stroke cylinder;
an auxiliary pressure roller being arranged below the second fuser roller, and further provided with a pressure roller driving cylinder which drives the movement of the auxiliary pressure roller, the pressure roller driving the cylinder and the auxiliary pressure roller to move away from or to approach the second;
wherein the auxiliary pressure roller has a roller core and several over the circumference of the comprises circular rolling bodies placed on the roll core, the diameters of the circular rolling bodies being the same and the diameters of the circular rolling bodies being larger than the diameter of the roll core, the circular rolling bodies being distributed in the axial direction of the roll core, but between every two adjacent ones in the axial direction of the roll core circular rolling bodies remain a gap;
further provided between the lower end of the heating box and the second nip roller is an ultrasonic diameter gauge for measuring the film bubble diameter and also a central controller, wherein the ultrasonic diameter gauge is connected to the central controller which is connected to the double stroke cylinder and the pressure roller drive cylinder.

Description

TECHNICAL AREA

The present invention relates to the technical field of film production, in particular to a device for the subsequent foaming of films.

STATE OF THE ART

Plastic films can be manufactured using a blow molding process. In the manufacturing process, the plastic melt is extruded upwards from an annular extrusion orifice of a die head 91 and forms film bubbles 81. As shown in Figure 1, a vertical air inlet pipe 92 is located in the center of the die head. At this time of manufacture, air can be blown through a vertical air inlet pipe 92 at the center of the die head in the film bubbles 81 to blow the film bubble 81, and thereafter the film bubbles are squeezed by the nip roller 93 above the die head to close the film 80 form, and then the film 80 is wound up. In the manufacturing process described above, only a single film bubble is formed, which is why one also speaks of a single film bubble process. Most of the common films generally use a single film bubble process.

However, some other films (e.g. heat-shrink films) cannot be fully formed by one-shot blowing. In other words, the properties thereof are poor when the heat-shrink films involve only one-time blow molding, so that these films generally require multiple blow molding. However, each time blow molding must form a one-time film bubble, that is, a multi-double film-blowing process, such as a double-film blowing process or a triple-blowing process, etc. must be employed.

In the multi-film bubble process, the first process to form the film bubble (first bubble for short) at a time is identical to that wound up. In the initial formation of the film bubble 81 (first bubble for short), the film bubble is pressed to form the film (referred to in the industry as defoaming). After defoaming, the film must be refoamed to form a second bubble 82, as in 2 shown to continue inflation and further stretching. A second foaming is called two-bubbles, sometimes even a third foaming is necessary, corresponding to a third foaming three-bubbles. Each froth is called a subsequent froth next to the first bubble.

The process of the subsequent foaming is different from the foaming process of the first bubble. This is because, as shown in Fig. 2, the first bubble 81 is extruded from the annular extrusion opening of the die head 1, i.e. one end of the film bubble 81 (first bubble) is placed in the die head 1, and compressed air is introduced into the film bubble 81 through the vertical air inlet pipe 92 can be blown in the middle of the nozzle head. While the film 80 is subsequently foamed, the upper and lower ends of the film bubble 82 (second bubble) are pinched by means of the nip roller (nip roller 1 and nip roller 2), without the participation of the die head 1, there is no vertical air inlet pipe 92 through which compressed air directly can be blown into the bubbles.

The structure of the existing device for the subsequent foaming of films includes, as in 2 shown, a first pinch roller 1 and a second pinch roller 2, the first pinch roller 1 lying above the second pinch roller 2, a heating box 4 being provided between the first pinch roller 1 and the second pinch roller 2, which is provided with a heating element 41, wherein the first tension pinch roller 1 comprises a first fixer roller 11 and a first loose roller 12, the first fixer roller 11 and the first loose roller 12 being parallel to one another and their vertical positions aligned, the position 11 of the first fixer roller 11 being stationary, the first fixer roller 11 a first motor for driving its rotation and further provided with a first horizontal cylinder which drives the first idler roller 12 in the horizontal direction, the first horizontal cylinder driving the first idler roller 12 away from or in the vicinity of the first fuser roller 11; wherein the second tension pinch roller 2 comprises a second fixer roller 21 and a second loose roller 22 , the second fuser roll 21 and the second floating roll 22 being parallel to each other and their vertical positions aligned, the position 11 of the second fuser roll 21 being stationary, the second fuser roll 21 having a second motor for driving its rotation and further with a second horizontal one Cylinder 3 driving the second floating roller 22 in the horizontal direction, the second horizontal cylinder 2 driving the second floating roller 22 away from the second fuser roller 21 or in the vicinity thereof.

The existing process for subsequent foaming of films is as follows:

The first loose roller 12 and the first fixer roller 11 are open. The film 80 is conveyed from an upstream station in a production line to a first pull nip roll. This slide 80 was already from another station in the Production line defoamed after foaming and folded into a two-layer film. As in 3 shown (the two-ply film is formed into a ring shape before being folded into the double layer), a worker pulls the film 80 between the first fixer roller 11 and the first loose roller 12, and then the first horizontal cylinder drives the first loose roller 12 like this assume that it is moving horizontally towards the first fuser roll 11, the first loose roll 12 being clamped with the first fuser roll 11 and the first tension pinch roll 1 starting to move down under gripping of the film. The worker continues pulling down the end of the film 80, the film passes through the heating box 4, and then moves down between the second fixer roller 22 and the second loose roller 21 of the second pulling pinch roller 2, whereupon the worker pulls the end of the film 80 and inflates an airgun through the contracted opening at the end of the foil toward the center of the foil to inflate the foil and form a second bladder 82. During this process, the heating box heats up and the film bubble is heated. When the temperature of the film bubbles reaches the melting limit, the second bubble 82 starts blowing and gradually increases in diameter. When the diameter of the second bubble 82 reaches the target value, the second horizontal cylinder 3 drives the second idler roller 22 to move toward the second fixer roller 21 horizontally. The second floating roller 22 is clamped between a second fixing roller 21 and a second fixing roller 21, and the bubble interior is completely sealed with the air in the bubble interior being retained therein, and the subsequent foaming process is completed.

1. 1. Während des Heizens und Aufblasens der Folienblase muss die zweite Zugklemmwalze den aufgespreizten Zustand aufrechterhalten, da das Aufblasen in den Folienblaseninnenraum fortgesetzt werden muss, so dass das untere Ende der Folienblase nicht durch Klemmen fixiert wird. Auch ist die Folienblase in vertikaler Richtung nicht gestrafft, so dass die Folienblasenform nicht stabil ist. Die Folienblase neigt dazu, durch die Einwirkung der Druckluft nach links und rechts zu schwingen und nach links und rechts zu weichen, so dass der Folienblasensdurchmesser und die Volumensteuerung ungenau sind. Noch schwerwiegender ist, dass die schaukelnde Folienblase dazu neigt, zu nahe an das Heizelement des Heizkastens heranzukommen oder sogar an diesem zu gelangen, und dazu neigt, lokal zu zerbrechen, was eine fehlgeschlagene Aufschäumung bedeutet, der wieder aufgenommen werden muss, sobald sie lokal zerbrochen ist;
2. 2. Die vorgeschaltete Folie wird durch Aufschäumen immer noch aus der Quelle ausgepresst und gefördert. Wenn der Aufschäumungsprozess zu lange dauert, kann die kontinuierlich von der stromaufwärts gelegenen Quelle zugeführte Folie daher in der Vorrichtung zum nachfolgenden Schäumen rückströmen und sich nicht rechtzeitig ableiten, wodurch die Folie verschränkt und das Schäumen fehlschlägt. Je kürzer also der nachfolgende Aufschäumungsprozess dauert, desto besser. Da jedoch in der herkömmlichen Vorrichtung zum nachfolgenden Schäumen die Folie zwischen der zweiten Loswalze und der zweiten Fixerwalze so schnell wie möglich passieren muss, um die im Fall einer abgerissenen und gebrochenen Folienblase während der Herstellung zum Passieren zwischen der zweiten Loswalze und der zweiten Fixerwalze und zum Entweichen zu bringen (um zu verhindern, dass die Folie für eine lange Zeit in dem Heizkasten verbleibt und einen Unfall, wie einen Feuer verursacht), muss die Öffnungsweite sowohl der zweiten Loswalze als auch der zweiten Fixerwalze ausreichend groß sein, was bedeutet, dass die Öffnungsweite der Folie während des gesamten Aufblasvorgangs groß ist und der Hub des die zweite Loswalze antreibenden Zylinders groß sein muss; Die große Öffnungsbreite des unteren Endes der Folienblase ist jedoch vorteilhaft für einen schnellen Eintritt von Gas in den Folienblaseninnenraum in der Anfangsphase von Aufblasen, da jedoch die Öffnungsbreite des unteren Endes der Folienblase groß ist, was nachteilig ist für das Halten der Luft in dem Folienblaseninnenraum, wenn der Druck in dem Folienblaseninnenraum ansteigt, so dass der gesamte Aufblasvorgang länger dauert und die Aufschäumzeit nicht verkürzt wird;
3. 3. Während des vorstehend beschriebenen Prozesses begann die zweite Zugklemmwalze zu schließen, wenn das Aufblasen vollendet ist und eine Zunahme der Folienblase auf den eingestellten Durchmesser detektiert wurde. Wie zuvor erwähnt, sind jedoch die zweite Loswalze und die zweite Fixerwalze in großen Abständen voneinander beabstandet, der Zylinderhub der zweiten Loswalze ist groß, der Schließ- und Einklemmsvorgang der zweiten Zugklemmwalze wird größer verformt, und die zweite Loswalze muss sich während des Schließvorgangs weit bewegen, die Bewegungszeit ist lang, d.h. der Zeitpunkt, zu dem erfasst wird, dass der Folienblasensdurchmesser einen Sollwert aufweist, ist in großem Abstand von dem Zeitpunkt, zu dem das endgültige tatsächliche Schließen erfolgt, so dass sich die Folienblasenform nach dem Schließen relativ zu der Folienblasenform vor dem Schließen (d.h. der Folienblasenform, wenn erfasst wird, dass der Folienblasensdurchmesser einen Sollwert aufweist) stark ändert. Daher kann ein kleiner Unterschied in der Folienblasensdurchmesser, wenn der Durchmesser als ein Sollwert detektiert wird, gegenüber der Folienblasensdurchmesser nach dem endgültigen Schließen bestehen, was bedeutet, dass die Genauigkeit der Steuerung des Folienblasensdurchmessers beim Aufschäumungsprozess verbessert wird (beim Aufschäumungsprozess bestimmt der Folienblasensdurchmesser die Größe des Volumens des Folienblaseninnenraums und somit die Größe der Folienblase).

However, the foaming process described above has the following problems:

1. 1. During the heating and inflation of the bubble film, the second tension pinch roller needs to maintain the spread state because the inflation needs to be continued into the bubble interior space so that the lower end of the bubble film is not fixed by pinching. Also, the bubble is not tightened in the vertical direction, so the bubble shape is not stable. The film bubble tends to oscillate left and right and deviate left and right by the action of the compressed air, so the film bubble diameter and volume control are inaccurate. More seriously, the rocking film bubble tends to get too close or even get to the heating element of the heating box and tends to break locally, which means failed foaming, which needs to be resumed once broken locally is;
2. 2. The upstream foil is still pressed and conveyed from the source by foaming. Therefore, if the foaming process takes too long, the film continuously fed from the upstream source may backflow in the subsequent foaming device and not drain out in time, causing the film to entangle and foaming to fail. So the shorter the subsequent foaming process lasts, the better. However, since in the conventional device for subsequent foaming the film must pass between the second loose roller and the second fixer roller as quickly as possible in order to avoid the film bubble torn off and broken during production for passing between the second loose roller and the second fixer roller and to the To escape (to prevent the film from staying in the heating box for a long time and causing an accident such as a fire), the opening width of both the second loose roller and the second fixer roller must be sufficiently large, which means that the opening width of the film is large throughout the inflation process and the stroke of the cylinder driving the second floating roller must be large; However, the large opening width of the lower end of the bubble is advantageous for rapid entry of gas into the bubble interior at the initial stage of inflation, however, since the opening width of the lower end of the bubble is large, which is disadvantageous for keeping the air in the bubble interior, when the pressure in the film bubble interior increases, so that the whole inflation process takes longer and the foaming time is not shortened;
3. 3. During the process described above, when inflation is completed and an increase in the film bubble to the set diameter was detected, the second pull pinch roll began to close. However, as mentioned above, the second loose roller and the second fixer roller are spaced at large distances from each other, the cylinder stroke of the second loose roller is large, the closing and pinching operation of the second tension pinch roller is deformed larger, and the second loose roller has to move far during the closing operation , the moving time is long, that is, the time when it is detected that the bubble diameter has a target value is far from the time when the final actual closing occurs, so that the bubble shape after upon closing relative to the bubble shape before closing (ie, the bubble shape when the bubble diameter is detected to be at a target value). Therefore, there can be a small difference in the bubble diameter when the diameter is detected as a target value versus the bubble diameter after final closing, which means that the accuracy of controlling the bubble diameter in the foaming process is improved (in the foaming process, the bubble diameter determines the size of the bubble volume of the film bubble interior and thus the size of the film bubble).

For the above reasons, the accuracy of controlling the diameter after the subsequent foaming of prior art films is low, and the foaming failure rate is high. Successful formation of film bubbles often requires multiple foamings.

CONTENT OF THE PRESENT INVENTION

It is an object of the present invention to overcome the above disadvantages and to provide a subsequent foaming apparatus which improves the foaming success rate and improves the accuracy of the diameters of the film bubbles obtained by the foaming.

The object is achieved by the following solutions: a device for the subsequent foaming of films, a first tensioning roller and a second tensioning roller, the first tensioning roller lying above the second tensioning roller, a heating box being provided between the first tensioning roller and the second tensioning roller, the is equipped with a heating element,
wherein the first tension pinch roller comprises a first fuser roller and a first idler roller, the first fuser roller and the first idler roller being parallel to one another and their vertical positions aligned, the position of the first fuser roller being stationary, the first fuser roller having a first motor for driving its rotation and is further provided with a first horizontal cylinder which drives the first floating roller in the horizontal direction, the first horizontal cylinder driving the first floating roller away from or in the vicinity of the first fuser roller,
wherein the second tension pinch roll comprises a second fuser roll and a second idler roll, the second fuser roll and the second idler roll being parallel to one another and their vertical positions aligned, the position of the second fuser roll being stationary, the second fuser roll having a second motor for driving its rotation and further provided with a second horizontal cylinder driving the second idler roller in the horizontal direction, the second horizontal cylinder driving the second idler roller away from or near the second fuser roller;
characterized in that the second horizontal cylinder is a double stroke cylinder, the double stroke cylinder comprising two strokes to space the second floating roller two different distances apart, the second floating roller being far away from the second fixer roller when the double stroke cylinder is in a fully retracted state is located, wherein the second loose roller is closer to the second fixer roller with a gap in between when the first stroke is realized by the double stroke cylinder, wherein the second loose roller bears against the second fixer roller when the second stroke is realized by the double stroke cylinder,
an auxiliary pressure roller being arranged below the second fuser roller, and further provided with a pressure roller driving cylinder which drives the movement of the auxiliary pressure roller, the pressure roller driving the cylinder and the auxiliary pressure roller to move away from or to approach the second fuser roller;
wherein the auxiliary pressure roller comprises a roller core and a plurality of circular rollers fitted over the circumference of the roller core, the diameters of the circular rollers being equal and the diameters of the circular rollers being larger than the diameter of the roller core, the circular rollers being distributed in the axial direction of the roller core , but a gap remains in the axial direction of the roll core between every two adjacent circular rolling bodies;
further provided between the lower end of the heating box and the second nip roller is an ultrasonic diameter gauge for measuring the film bubble diameter and also a central controller, wherein the ultrasonic diameter gauge is connected to the central controller which is connected to the double stroke cylinder and the pressure roller drive cylinder.

The double-stroke cylinder comprises two cylinder units, each cylinder unit having a cylinder block and a piston rod, the piston rods of the two cylinder units being opposed to the direction in which the respective cylinder blocks are pushed, the piston rods of the two cylinder units being on a common line and the cylinder blocks of the two cylinder units are connected to each other, the piston rod of the first cylinder unit being stationary and the piston rod of the second cylinder unit to the second The floating roller is connected, with the double-stroke cylinder being in a fully retracted state when the piston rod of the first cylinder unit is fully retracted with respect to the cylinder block of the first cylinder unit, while the piston rod of the second cylinder unit is fully retracted with respect to the cylinder block of the second cylinder unit ; wherein the first stroke is realized by the double-stroke cylinder when the piston rod of the first cylinder unit is fully pushed with respect to the cylinder block of the first cylinder unit while the piston rod of the second cylinder unit is fully retracted with respect to the cylinder block of the second cylinder unit; wherein the second stroke is realized by the double-stroke cylinder when the piston rods of the two cylinder units are fully abutted against the respective cylinder blocks.

1. 1. In der vorliegenden Erfindung wurden die oberen und unteren Enden der Folienblase geklemmt und fixiert, bevor sie erhitzt werden, und die Folienblase kann durch eine zweite Fixierwalze und eine Hilfsdruckwalze festgeklemmt und dann nach unten gedrückt werden, wodurch die Folienblase von der vertikalen Aufwärtsbewegung her gestrafft (gezogen) wird, die Position der Mittelachse der Folienblase stabilisiert wird und die Folienblase nicht durch Einwirkung von Druckluft nach links und rechts verwirbelt werden, so dass die Kontrolle des Durchmessers und Volumens der Folienblase genau ist. Noch wichtiger ist es, zu vermeiden, dass die schaukelnde Folienblase zu nahe an das Heizelement des Heizkastens heranzukommen oder sogar an diesem zu gelangen, was zu einem lokalen Bersten der Folienblase führt und den Erfolg der Aufschäumung erhöht.
2. 2. In der vorliegenden Erfindung wird die Öffnungsbreite an einem unteren Ende der Folienblase gemäß dem Fortschreiten des Aufblasens während des Aufblasens der Folienblase allmählich verringert. Die Öffnung am unteren Ende der Folienblase nimmt sogar auf nur lokale Lücken ab. In der frühen Aufblasstufe ist die Öffnung aufgrund des niedrigen Innendrucks der Folienblase zur Beschleunigung der Aufblasgeschwindigkeit stärker vorteilhaft. In der späten Aufblasstufe wird das schrittweise Verringern der Öffnung vorteilhaft, um ein Entweichen der Luft in dem Kolben nach außen zu verringern, da der innere Luftdruck des Kolbens erhöht wird. Insgesamt kann so die Aufblasszeit verkürzt werden, was zur Beschleunigung des Aufblassvorgangs und zur Verkürzung der Aufschäumzeit beträgt;
3. 3. Die zweite Zugklemmwalze begann zu schließen, wenn das Aufblasen der Folienblase abgeschlossen war und detektiert wurde, dass die Folienblase dem eingestellten Durchmesser entsprach. Da das untere Ende der Folienblase vor dem Schließen durch die zweite Fixerwalze und die Hilfsdruckwalze festgeklemmt ist, ist die Form der Folienblase vor und nach dem Schließen durch die zweite Zugklemmwalze im Wesentlichen unverändert. Ferner ist die zweite Loswalze vor dem Schließen nahe an die zweite Fixerwalze gebracht, und daher ist die Amplitude der Bewegung der zweiten Loswalze während dem Schließen gering, und die Bewegungszeit ist kurz, d.h. der Zeitpunkt, zu dem erfasst wird, dass der Folienblasensdurchmesser einen Sollwert erreicht, ist kurz von dem Zeitpunkt, zu dem das tatsächliche Schließen abgeschlossen ist. Beide oben genannten Ursachen führen zu einem genaueren Folienblasensdurchmesser bei der nachfolgenden Aufschäumung.
4. 4. In der vorliegenden Erfindung wird der Doppelhubzylinder vollständig zusammengezogen, wenn die Folie zwischen der zweiten Loswalze und der zweiten Fixerwalze durchlaufen wird, und die Breite der Öffnung zwischen der zweiten Loswalze und der zweiten Fixerwalze kann ausreichend groß sein. Wenn andererseits die Folienblasen während der Produktion reißen, dann kann der Doppelhubzylinder vollständig zusammengezogen, um zu ermöglichen, dass die zerbrochenen (zerbrochenen) Folienblasen zwischen der zweiten Loswalze und der zweiten Fixerwalze so schnell wie möglich durchgehen und entweichen, ohne dass die Filme für eine lange Zeit in dem Heizkasten verbleiben und einen Unfall, wie ein Feuer oder dergleichen, verursachen.

The present invention has the advantages and effects:

1. 1. In the present invention, the upper and lower ends of the bubble film were pinched and fixed before being heated, and the bubble film can be pinched by a second fixing roller and an auxiliary pressure roller, and then pushed down, thereby preventing the bubble film from vertical upward movement is tightened (pulled), the position of the central axis of the bubble is stabilized, and the bubble is not swirled left and right by the action of compressed air, so that the control of the diameter and volume of the bubble is accurate. More importantly, avoid the rocking bubble getting too close to or even getting on the heating element of the heating box, leading to local rupture of the bubble and increasing the success of the foaming.
2. 2. In the present invention, the opening width at a lower end of the bubble film is gradually reduced according to the progress of inflation during inflation of the bubble film. The opening at the bottom of the film bubble decreases even to only local gaps. In the early stage of inflation, the opening is more advantageous for accelerating the inflation speed due to the low internal pressure of the film bubble. In the late inflation stage, gradually reducing the opening becomes advantageous to reduce outward leakage of the air in the piston as the internal air pressure of the piston is increased. Overall, the inflation time can be shortened, which contributes to accelerating the inflation process and shortening the foaming time;
3. 3. The second pull pinch roll started to close when the film bubble inflation was completed and it was detected that the film bubble met the set diameter. Since the lower end of the bubble film is pinched before being closed by the second fixing roller and the auxiliary pressure roller, the shape of the bubble film is substantially unchanged before and after being closed by the second tension pinch roller. Further, the second loose roller is brought close to the second fixer roller before closing, and therefore the amplitude of the movement of the second loose roller during closing is small, and the moving time is short, that is, the time when it is detected that the film bubble diameter reaches a target value reached is short of the time when the actual closing is complete. Both of the above causes result in a more accurate film bubble diameter during subsequent foaming.
4. 4. In the present invention, the double stroke cylinder is fully contracted when the film is passed between the second loose roller and the second fixer roller, and the width of the opening between the second loose roller and the second fixer roller can be sufficiently large. On the other hand, if the film bubbles rupture during production, then the double stroke cylinder can be fully contracted to allow the broken (broken) film bubbles to pass between the second loose roller and the second fixer roller and escape as quickly as possible without damaging the films for a long time stay in the heater box for a long time and cause an accident such as a fire or the like.

character list

• 1 shows a schematic representation of the production device and the production process for the single bubble method.
• 2 shows a schematic representation of the production device and the production process for the conventional double bubble method.
• 3 shows a schematic representation of the cut before the film is folded into the double layer.
• 4 Fig. 12 shows a schematic structural view of the first embodiment of the present invention.
• 5 FIG. 12 shows a schematic structural view of the double-stroke cylinder and the second loose roller 4 .
• 6 Fig. 12 shows a schematic structural view of the auxiliary pressure roller and the second fixer roller.
• 7 Fig. 12 shows a schematic representation of an intermediate state of step (2) of the second embodiment of the present invention.
• 8th Fig. 12 shows a schematic representation of a result state of step (2) of the second embodiment of the present invention.
• 9 Fig. 12 shows a schematic representation of a result state of step (3) of the second embodiment of the present invention.
• 10 Fig. 12 shows a schematic representation of a result state of step (4) of the second embodiment of the present invention.
• 11 Fig. 12 shows a partially enlarged schematic view 10 .
• 12 Fig. 12 shows a schematic representation of a result state of step (5) of the second embodiment of the present invention.
• 13 Fig. 12 shows a partially enlarged schematic view 12 .
• 14 Fig. 12 shows a schematic representation of step (6) of the second embodiment of the present invention.
• 15 Fig. 12 shows a partially enlarged schematic view 14 .
• 16 Fig. 12 shows a schematic representation of an intermediate state of step (8) of the second embodiment of the present invention.
• 17 Fig. 12 shows a partially enlarged schematic view 16 .

DETAILED DESCRIPTION

First embodiment:

one inside 4 The device shown for the subsequent foaming of films comprises a first pinch roller 1 and a second pinch roller 2, with the first pinch roller 1 being located above the second pinch roller 2, with a heating box 4 being provided between the first pinch roller 1 and the second pinch roller 2, which is equipped with a heating element is provided; wherein the first tension pinch roll 1 comprises a first fixer roll 11 and a first loose roll 12, the first fixer roll 11 and the first loose roll 12 being parallel to each other and their vertical positions aligned (i.e. in the same vertical position), the position of the first fixer roll 11 stationary is, wherein the first fixer roller 12 has a first motor for driving its rotation and is further provided with a first horizontal cylinder 13 which drives the first floating roller 12 in the horizontal direction, the first horizontal cylinder 13 separating the first floating roller 12 from the first drives fuser roller 11 away or near it; wherein the first tension pinch roller 2 comprises a first fixer roller 21 and a first loose roller 22, wherein the first fixer roller 21 and the first loose roller 22 are parallel to one another and their vertical positions are aligned, the position of the first fixer roller 21 being stationary, the first fixer roller 21 a first motor for driving its rotation and further provided with a first horizontal cylinder 3 which horizontally drives the first loose roller 22, the first horizontal cylinder 3 displacing the first loose roller 22 away from or near the first fuser roller 11 drives;wherein the second horizontal cylinder 3 is a double-stroke cylinder; as in 5 and 13 shown, wherein the double-stroke cylinder comprises two strokes in order to push the second floating roller apart by two different distances, wherein the double-stroke cylinder comprises two cylinder units, each cylinder unit having a cylinder block and a piston rod, the cylinder block 32 of the first cylinder unit having the cylinder block 34 of the second cylinder unit, the piston rod 31 of the first cylinder unit being stationary (fixed to the frame 90 of the apparatus) and the piston rod 33 of the second cylinder unit being connected to the second floating roller 22; the piston rod 21 of the first cylinder unit and the piston rod 33 of the second cylinder unit are arranged on a line such that the piston rods of the two cylinder units are opposed to the direction in which the respective cylinder blocks are pushed; in 1 the direction of thrust of the piston rod 31 of the first cylinder unit with respect to the cylinder block 32 of the first cylinder unit is toward the right side in the plane of the drawing, and the direction of thrust of the piston rod 33 of the second cylinder unit with respect to the cylinder block 34 of the second cylinder unit is toward the right side in the image plane directed; the double-stroke cylinder 3 is in a fully retracted state when the piston rod 31 of the first cylinder unit is fully retracted with respect to the cylinder block 32 of the first cylinder unit, while the piston rod 33 of the second cylinder unit is fully retracted with respect to the cylinder block 34 of the second cylinder unit is; wherein the first stroke is realized by the double-stroke cylinder 3 when the piston rod 31 of the first cylinder unit is fully pushed with respect to the cylinder block 32 of the first cylinder unit, while the piston rod 33 of the two th cylinder unit is fully retracted with respect to the cylinder block 34 of the second cylinder unit; the second stroke being realized by the double-stroke cylinder 3 when the piston rods of the two cylinder units are fully abutted with respect to the respective cylinder blocks (i.e. that the piston rod 31 of the first cylinder unit is fully abutted with respect to the cylinder block 32 of the first cylinder unit, while the piston rod 33 the second cylinder unit is also fully abutted with respect to the cylinder block 34 of the second cylinder unit); wherein the second loose roller 22 is far away from the second fixer roller 21 when the double stroke cylinder 3 is in a fully retracted state as in FIG 9 , 10 and 11 shown; the second loose roller 22 being closer to the second fixer roller 21 with a gap in between when the first stroke is realized by the double stroke cylinder 3 as in FIG 12 and 13 shown; the second loose roller 22 rests against the second fixer roller 21 when the second stroke is implemented by the double-stroke cylinder 3, as in FIG 16 and 17 shown;
as in 4 , 6 , 15 and 16 as shown, an auxiliary pressure roller 5 is arranged below the second fuser roller 21, and further with a pressure roller drive cylinder 3 which drives the movement of the auxiliary pressure roller 5, the pressure roller drive cylinder 53 driving the auxiliary pressure roller 5 to move away from or to approach the second fuser roller; as in 4 shown, the auxiliary pressure roller 5 comprises a roller core 51 and a plurality of circular roller bodies 52 placed over the circumference of the roller core, the diameters of the circular roller bodies 52 being the same and the diameters of the circular roller bodies 52 being larger than the diameter of the roller core 51, the circular roller bodies 52 are distributed in the axial direction of the roll core 51, but a gap remains in the axial direction of the roll core 51 between every two adjacent circular rolling bodies 52;
as in 4 shown, between the lower end of the heating box 4 and the second pinch roller 2 there is also an ultrasonic diameter measuring device 6 for measuring the film bubble diameter and also a central controller, the ultrasonic diameter measuring device being connected to the central controller which is connected to the double-stroke cylinder 3 and the pressure roller drive cylinder 53 is.

Second embodiment:

1. (1) Vorbereiten auf Aufschäumen, wobei die erste Fixerwalze 11 und die zweite Fixerwalze 21 in Drehung gehalten werden und die erste Loswalze 12 und die erste Fixerwalze 11 der ersten Zugklemmwalze 1 auseinandergezogen werden (d.h. die erste Loswalze 12 liegt von der ersten Fixerwalze 11, wobei sie nicht zwischen sich einschließen), der Doppelhubzylinder 3 sich in einem vollständig zusammengezogenen Zustand befindet und die Hilfsdruckwalze 5 sich von der zweiten Fixerwalze 21 entfernt; Die Folie 80 wird von einer vorgelagerten Station in einer Fertigungsstraße zu einer ersten Zugklemmwalze befördert. Diese Folie 80 wurde bereits von einer weiteren Station in der Fertigungsstraße nach dem Schäumen entschäumt und zu einer zweilagigen Folie gefaltet, wie in 3 gezeigt (die zweilagige Folie wird, bevor sie in die doppelte Schicht gefaltet wird, in Ringform gebracht). Die Folie 80 läuft zuerst bis zu einem Ende (A-Ende wie in 7, 8, 9, und 10) der ersten Zugklemmwalze, das stromaufwärtige Ende der Folie genannt.
2. (2) Der Arbeiter zieht das stromaufwärtige Ende der Folie 80 nach unten zwischen der ersten Fixerwalze 11 und der ersten Loswalze 12, wie in 7 gezeigt, und dann treibt der erste horizontale Zylinder 13 die erste Loswalze 12 derart an, dass sie sich horizontal in Richtung der ersten Fixerwalze 11 bewegt, wobei die erste Loswalze 12 mit der ersten Fixerwalze 11 eingespannt, wie in 8 gezeigt, und die erste Zugklemmwalze 1 beginnt, sich unter dem Greifen der Folie 80 nach unten zu bewegen. Der Wert der Breite der Folie 80, wenn sie die erste Zugklemmwalze 1 passiert, beträgt b (da der Film 80 doppellagig ist, ist der gesamte Umfang desselben 2b, wenn er in einem nachfolgenden Schritt zu einer kreisrunden Form geweitet wird, wie in 3 gezeigt);
3. (3) Der Arbeiter zieht das stromaufwärtige Ende der Folie 80 weiter nach unten, läuft an dem Heizkasten 4 vorbei, läuft an dem Ultraschalldurchmessermessgerät 6 vorbei, läuft dann nach unten zwischen der zweiten Fixerwalze 21 und der zweiten Loswalze 22 der zweiten Zugklemmwalze 2 und läuft dann zwischen der zweiten Fixerwalze 21 und der Hilfsdruckwalze 5, wie in 9 gezeigt;
4. (4) Nachdem die Folie 80 zwischen der zweiten Fixerwalze 21 und der Hilfsdruckwalze 5 hindurchgegangen ist, zieht der Arbeiter das stromaufwärtige Ende der Folie 80 zusammen und ein Luftgewehr 7 durch die zusammengezogene Öffnung am stromaufwärtigen Ende der Folie zur Mitte der Folie 80 aufbläst, um die Folie zwischen der ersten Zugklemmwalze 1 und der zweite Zugklemmwalze 2 aufzublasen und eine Blase 82 zu bilden. Der Durchmesser der Blase 82 wird allmählich größer und ihr oberes Ende wird von der ersten Zugklemmwalze 1 eingeklemmt, so dass die Position ihres oberen Endes fixiert ist, wie in 10 und 11 gezeigt;
5. (5) Der Arbeiter bewegt sich mit dem handgehaltenen Luftgewehr 7 und zieht weiterhin das stromaufwärtige Ende des Films 80 zur stromabwärtigen Seite. Wenn der von dem Ultraschalldurchmessermessgerät 6 gemessene Durchmesser der Folienblasen 82 2b/π × a1 erreicht (wobei a1 der erste Umrechungsfaktor des Blasengrades der Folienblasen ist, a1 bei diesem Ausführungsbeispiel 0, 7 beträgt und b der Breitenwert ist, bei dem die Folie 80 die erste Zugklemmwalze 1 passiert), befiehlt die zentrale Steuerung, dass der erste Hub durch den Doppelhubzylinder 3 realisiert wird, wenn die Kolbenstange 31 der ersten Zylindereinheit vollständig in Bezug auf den Zylinderblock 32 der ersten Zylindereinheit gestoßen ist, während die Kolbenstange 33 der zweiten Zylindereinheit vollständig in Bezug auf den Zylinderblock 34 der zweiten Zylindereinheit eingefahrenen ist, sodass sich die zweite Loswalze 22 an die zweite Fixerwalze 21 annähert, wobei jedoch ein Spalt dazwischen bleibt, wie in 12 und 13 gezeigt;
6. (6) Der Arbeiter bewegt sich mit dem handgehaltenen Luftgewehr 7 und zieht weiterhin das stromaufwärtige Ende des Films 80 zur stromabwärtigen Seite der Fertigungsstraße. Während dieses Vorgangs bläst das Luftgewehr 7 weiter die Folie zur Mitte auf und die eingefüllte Luft diffundiert ebenfalls in die Folienblasen 82, wobei der Durchmesser der Folienblasen 82 weiter vergrößert wird. Wenn der von dem Ultraschalldurchmessermessgerät 6 gemessene Durchmesser der Folienblasen 2b/π × a2 erreicht (wobei a2 der zweite Umrechungsfaktor des Blasengrades der Folienblasen ist, a2 bei diesem Ausführungsbeispiel 0, 85 beträgt), treibt der Druckwalzenantriebszylinder 53 die Hilfsdruckwalze 5 nahe an die zweite Fixerwalze 21 an, sodass der kreisförmige Walzkörper 52 der Hilfsdruckwalze an der zweiten Fixerwalze 21 anliegt, wie in 14 und 15 gezeigt; Nachdem der kreisförmige Walzkörper 52 der Hilfsdruckwalze an der zweiten Fixerwalze 21 anliegt, wird das untere Ende der Folienblase 82 von der zweiten Fixerwalze 21 und dem kreisförmigen Walzkörper 52 der Hilfsdruckwalze eingeklemmt und der kreisförmige Walzkörper 52 der zweiten Fixerwalze 21 und der Hilfsdruckwalze beginnen auch, die Abwärtsbewegung der dazwischen eingefügten Folie zu unterstützen, wodurch die Folienblase 82 gerade gezogen wird und die Lage der Mittelachse der Folienblase 82 stabilisiert wird. Das Gasdruck, der durch das Luftgewehr 7 geblasene Luft ezeugt wird, wird durch einen Spaltbereich zwischen dem Walzenkern 51 der Hilfsdruckwalze und der zweiten Fixerwalze in den Innenraum der Folienblase 82 übertragen;
7. (7) Der Arbeiter bewegt sich mit dem handgehaltenen Luftgewehr 7 und zieht weiterhin das stromaufwärtige Ende des Films zur stromabwärtigen Seite der Fertigungsstraße. Der Heizkasten 4 erwärmt die Folienblasen, so dass die Temperatur der Folienblasen 82 erhöht. Die Folienblasen 82 beginnen zu blasen, wenn ihre Temperatur den kritischen Wert des Schmelzens erreicht. Nach dem Aufblasen der Folienblasen 82 erhöht sich das Volumen des Innenraums der Folienblasen 82. Die durch das Luftgewehr geblasene Luft wird durch den Spalt zwischen dem Walzenkern 51 der Hilfsdruckwalze und der zweiten Fixerwalze 21 weiter in den Innenraum der Folienblasen 82 aufgeblasen, so dass die Folienblasen 82 nicht dem entsprechend verringerten Luftdruck aufgrund des erhöhten Volumens nach dem Aufblasen ausgesetzt sind;
8. (8) Wenn der durch das Ultraschalldurchmessermessgerät gemessene Folienblasensdurchmesser gleich dem eingestellten Folienblasensdurchmesser ist, befiehlt die zentrale Steuerung, dass der zweite Hub durch den Doppelhubzylinder 3 realisiert wird, wenn die Kolbenstange 31 der ersten Zylindereinheit vollständig in Bezug auf den Zylinderblock 32 der ersten Zylindereinheit gestoßen ist, während die Kolbenstange 33 der zweiten Zylindereinheit vollständig in Bezug auf den Zylinderblock 34 der zweiten Zylindereinheit gestoßen ist, so dass der Innenraum der Folienblasen 82 vollständig abgedichtet ist und Luft in dem Innenhohlraum der Folienblasen bleibt, wie in 16 und 17 gezeigt; die zentrale Steuerung befiehlt dann dem Druckwalzenantriebszylinder 53, die Hilfsdruckwalze 5 von der zweiten Fixerwalze 21 weg zu treiben; das Luftgewehr 7 stoppt das Blasen und der nachfolgende Aufschäumungsprozess ist abgeschlossen.

Subsequent foaming of films using the device for subsequent foaming of films in the first exemplary embodiment comprises the following steps:

1. (1) Preparing for foaming, with the first fuser roll 11 and the second fuser roll 21 kept rotating and the first loose roll 12 and the first fixer roll 11 of the first tension pinch roll 1 being pulled apart (ie the first loose roll 12 lies away from the first fixer roll 11, not sandwiching between them), the double-stroke cylinder 3 is in a fully contracted state and the auxiliary pressure roller 5 moves away from the second fixer roller 21; The film 80 is conveyed from an upstream station in a production line to a first pull nip roll. This film 80 has already been defoamed by a further station in the production line after foaming and folded into a two-layer film, as in 3 shown (the two-ply film is formed into a ring shape before being folded into the double layer). Foil 80 first runs to one end (A end as in 7 , 8th , 9 , and 10 ) of the first nip roll, called the upstream end of the film.
2. (2) The worker pulls down the upstream end of the film 80 between the first fixer roller 11 and the first loose roller 12 as shown in FIG 7 1, and then the first horizontal cylinder 13 drives the first loose roller 12 to move horizontally toward the first fixer roller 11 with the first loose roller 12 clamped with the first fixer roller 11 as shown in FIG 8th 1, and the first pull pinch roller 1 starts to move down under the gripping of the film 80. The value of the width of the film 80 when it passes the first nip roller 1 is b (since the film 80 is double-layered, the entire circumference thereof is 2b when it is expanded into a circular shape in a subsequent step, as in Fig 3 shown);
3. (3) The worker further pulls down the upstream end of the film 80, passes the heating box 4, passes the ultrasonic diameter gauge 6, then passes down between the second fixer roller 21 and the second loose roller 22 of the second tension pinch roller 2 and runs then between the second fixer roller 21 and the auxiliary pressure roller 5, as in 9 shown;
4. (4) After the film 80 has passed between the second fuser roller 21 and the auxiliary pressure roller 5, the worker contracts the upstream end of the film 80, and inflates an air gun 7 through the contracted opening at the upstream end of the film toward the center of the film 80, in order to to inflate the film between the first nip roller 1 and the second nip roller 2 and form a bubble 82 . The bubble 82 gradually increases in diameter and its upper end is caught by the first tension pinch roller 1 clamps so that the position of its upper end is fixed, as in 10 and 11 shown;
5. (5) The worker moves with the hand-held air gun 7 and keeps pulling the upstream end of the film 80 to the downstream side. When the diameter of the film bubbles 82 measured by the ultrasonic diameter measuring device 6 reaches 2b/π × a1 (where a1 is the first conversion factor of the degree of blistering of the film bubbles, a1 is 0.7 in this embodiment, and b is the width value at which the film 80 is the first passed pull pinch roller 1), the central controller orders the first stroke to be realized by the double stroke cylinder 3 when the piston rod 31 of the first cylinder unit is fully pushed in relation to the cylinder block 32 of the first cylinder unit, while the piston rod 33 of the second cylinder unit is fully pushed in is contracted with respect to the cylinder block 34 of the second cylinder unit so that the second loose roller 22 approaches the second fixer roller 21 with a gap left therebetween, as in FIG 12 and 13 shown;
6. (6) The worker moves with the hand-held airgun 7 and keeps pulling the upstream end of the film 80 to the downstream side of the production line. During this process, the air gun 7 continues to inflate the film to the center and the filled air also diffuses into the film bubbles 82, the diameter of the film bubbles 82 being further enlarged. When the diameter of the film bubbles measured by the ultrasonic diameter measuring device 6 reaches 2b/π × a2 (where a2 is the second conversion factor of the degree of blistering of the film bubbles, a2 is 0.85 in this embodiment), the pressure roller drive cylinder 53 drives the auxiliary pressure roller 5 close to the second fixer roller 21 so that the circular roller body 52 of the auxiliary pressure roller rests against the second fixer roller 21, as in FIG 14 and 15 shown; After the circular rolling body 52 of the auxiliary pressure roller abuts against the second fuser roller 21, the lower end of the film bubble 82 is pinched by the second fuser roller 21 and the circular rolling body 52 of the auxiliary pressure roller, and the circular rolling body 52 of the second fixer roller 21 and the auxiliary pressure roller also start the To support downward movement of the film interposed therebetween, whereby the film bubble 82 is straightened and the position of the central axis of the film bubble 82 is stabilized. The gas pressure generated by the air blown by the air gun 7 is transmitted to the inner space of the film bubble 82 through a gap portion between the roller core 51 of the auxiliary pressure roller and the second fixing roller;
7. (7) The worker moves with the hand-held airgun 7 and keeps pulling the upstream end of the film to the downstream side of the production line. The heating box 4 heats the film bubbles so that the temperature of the film bubbles 82 increases. The film bubbles 82 begin to blow when their temperature reaches the critical point of melting. After the film bubbles 82 have been inflated, the volume of the interior of the film bubbles 82 increases. The air blown by the air gun is further inflated through the gap between the roller core 51 of the auxiliary pressure roller and the second fixer roller 21 into the interior of the film bubbles 82, so that the film bubbles 82 are not subjected to the corresponding reduced air pressure due to the increased volume after inflation;
8. (8) When the bubble diameter measured by the ultrasonic diameter gauge is equal to the set bubble diameter, the central controller commands the second stroke to be realized by the double stroke cylinder 3 when the piston rod 31 of the first cylinder unit is fully pushed with respect to the cylinder block 32 of the first cylinder unit while the piston rod 33 of the second cylinder unit is fully pushed with respect to the cylinder block 34 of the second cylinder unit, so that the inner space of the film bubbles 82 is completely sealed and air remains in the inner cavity of the film bubbles, as in FIG 16 and 17 shown; the central controller then commands the pressure roller drive cylinder 53 to drive the auxiliary pressure roller 5 away from the second fuser roller 21; the air gun 7 stops blowing and the subsequent foaming process is complete.

In the second embodiment, the value of the first conversion factor of the bubble degree of the film bubbles a1 may be changed to 0.60 or 0.75;

In the second embodiment, the value of the second conversion factor of the bubble degree of the film bubbles a2 can be changed to 0.80 or 0.90.

The contents mentioned above are only the preferred specific embodiments of the present invention, but the scope of the present invention is not limited thereto. Therefore, all equivalent changes should Arrangements made under the principle of the present invention may be included within the scope of the present invention.

Claims (2)

Device for subsequent foaming of films, a first pinch roller and a second pinch roller, the first pinch roller being above the second pinch roller, a heating box provided between the first pinch roller and the second pinch roller being provided with a heating element, the first pinch roller a first fuser roller and a first floating roller, the first fuser roller and the first floating roller being parallel to one another and their vertical positions aligned, the position of the first fuser roller being stationary, the first fuser roller having a first motor for driving its rotation and further comprising a first horizontal cylinder that drives the first idler roller in the horizontal direction, the first horizontal cylinder driving the first idler roller away from or near the first fuser roller; wherein the second tension pinch roll comprises a second fuser roll and a second idler roll, the second fuser roll and the second idler roll being parallel to one another and their vertical positions aligned, the position of the second fuser roll being stationary, the second fuser roll having a second motor for driving its rotation and further provided with a second horizontal cylinder driving the second idler roller in the horizontal direction, the second horizontal cylinder driving the second idler roller away from or near the second fuser roller; characterized in that the second horizontal cylinder is a double stroke cylinder, the double stroke cylinder comprising two strokes to push the second floating roller apart by two different distances, the second floating roller being far away from the second fixer roller when the double stroke cylinder is in a fully retracted state is located, wherein the second loose roller is closer to the second fuser roller with a gap therebetween when the first stroke is realized by the double stroke cylinder, wherein the second loose roller abuts the second fuser roller when the second stroke is realized by the double stroke cylinder; an auxiliary pressure roller being arranged below the second fuser roller, and further provided with a pressure roller driving cylinder which drives the movement of the auxiliary pressure roller, the pressure roller driving the cylinder and the auxiliary pressure roller to move away from or to approach the second; wherein the auxiliary pressure roller comprises a roller core and a plurality of circular rollers fitted over the circumference of the roller core, the diameters of the circular rollers being equal and the diameters of the circular rollers being larger than the diameter of the roller core, the circular rollers being distributed in the axial direction of the roller core , but a gap remains in the axial direction of the roll core between every two adjacent circular rolling bodies; further provided between the lower end of the heating box and the second nip roller is an ultrasonic diameter gauge for measuring the film bubble diameter and also a central controller, wherein the ultrasonic diameter gauge is connected to the central controller which is connected to the double stroke cylinder and the pressure roller drive cylinder. Device for subsequent foaming of films claim 1 , characterized in that the double-stroke cylinder comprises two cylinder units, each cylinder unit having a cylinder block and a piston rod, the piston rods of the two cylinder units being opposite to the direction in which the respective cylinder blocks are pushed, the piston rods of the two cylinder units on lie on a common line and the cylinder blocks of the two cylinder units are connected to each other, with the piston rod of the first cylinder unit being stationary and the piston rod of the second cylinder unit being connected to the second floating roller, the double-stroke cylinder being in a fully retracted state when the piston rod of the first cylinder unit is fully retracted with respect to the cylinder block of the first cylinder unit, while the piston rod of the second cylinder unit is fully retracted with respect to the cylinder block of the second cylinder unit one is; wherein the first stroke is realized by the double-stroke cylinder when the piston rod of the first cylinder unit is fully pushed with respect to the cylinder block of the first cylinder unit while the piston rod of the second cylinder unit is fully retracted with respect to the cylinder block of the second cylinder unit; wherein the second stroke is realized by the double-stroke cylinder when the piston rods of the two cylinder units are fully abutted against the respective cylinder blocks.

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