DE3821025C2 - - Google Patents

Description

The invention relates to a device for manufacturing running plastic webs, in particular from catalyzed ten epoxy resins, comprising an application unit for application the resin onto a film or paper-like carrier web, wherein the applicator comprises two rollers, and at least a counter roller with which the carrier web against the Application unit can be pressed and means for transporting the Carrier web for application and transport of the finished one Plastic sheet away from the applicator.

A device of a similar type is known (DE 24 21 622 A1), where a back pressure roller is not against a roller a commissioned work including those to be coated Web is pressed, but continuously a nip is available.

In many areas of technology is increasing regarding the materials used, the requirement ge represents that this is less with the same strength  Should have weight. This is especially true in Field of aircraft construction and aerospace one always more prominent demand. An essential one Criterion for such materials made of plastics, which have the same strength and a lower weight than, for example, have to have metallic materials is that down to the minimum millimeter range going thickness tolerances, as with metallic Materials relatively simple by appropriate Rolls are possible, even with materials made of plastic.

So far, thin plastic sheets have basically been made a mixture of plastic and a suitable Lö produced means, the plastic and the Solvent to achieve an acceptable tolerance with respect to the thickness of the plastic sheet in a predetermined Relationship stands. The disadvantage of the previous one Manufacturing process consists essentially in that a very high evaporation work is necessary in order to 75% or more solvent content in Ge to allow the mixture to evaporate, i.e. it is a high ener water supply necessary. Another disadvantage of the previous way of producing such plastic orbits is that due to the high solvent often a bubble-free production in the mixture the plastic sheet is not possible. Often but are plastic sheets, the production-related Contain bubbles, cannot be used for a variety of purposes, especially when it comes to extremely high strength requirements arrives. After all, it is according to the known way of producing plastic sheets disadvantageous, that because of certain plastics tolerance is very high not set with the required accuracy  can be as required for certain purposes would.

It is an object of the present invention, a Vorrich device for the production of running plastic sheets in shape to create a preliminary product that is so dimensionally accurate in terms of its thickness is producible that one after following processing of the plastic sheets with respect to the final adjustment of their thickness without difficulty ten can take place, the device simple is under construction and the disadvantages of previous devices and procedures of this type are avoided.

The object is achieved according to the invention in that the applicator can be moved in two end positions is that to keep it in sync with the Carrier web the counter pressure roller with one roller of the Commissioned work or to create a counterflow with the other roller of the applicator is engaged.

The advantage of the device according to the invention lies in essential in that a preliminary product in the form of a running plastic web can be provided by it, in which, for example, by means of a calender only still low loads on the provided plastic sheet need to be exercised in order to do this on the final dimensional accuracy in compliance with specified Bring tolerances. The main advantage of the invention is also the fact that plastics are used can, for example catalyzed epoxy resins, the extreme when certain temperature limits are exceeded show rapid exothermic reactions, whereby basically these reactions also as a result of exceeding certain temperature limits due to a Pressure increase on the plastic web in calendering plants  can expire. With the device according to the invention can with great certainty and with high accuracy Plastic layers in wide limits of any thickness be manufactured, i.e. Intermediate products provided whose final thickness is safe and high Precision can be brought to its final thickness can. There will also be bubbles in the plastic material completely avoided as well as the supply of energy to the Compensate for the evaporation of the solvent deprived of heat, as was previously the case in the production of Plastic sheets from a solution was needed.

In the device, the counter-pressure roller can advantageously trained immovably relative to the carrier web be, i.e. the counter-pressure roller itself is in the Device or in the specific part of the device, in which also trained the cooperating commissioned work is fixed. To set the synchronization or the The rollers of the Applicator advantageously together relative to Back pressure roller by moving either into a first or adjustable in a second direction. According to another advantageous embodiment of the invention the counter-pressure roller can be moved relative to the carrier web trained, whereby for setting a synchronism or a counter-rotation relative to the rollers of the applicator to the device or part of the device the applicator carries, remain firm while the back pressure roller at a predetermined direction and in the corresponding opposite direction can be moved back and forth.

In a further advantageous embodiment of the front The rollers of the applicator are in one direction Guides slide back and forth in a rack attached, preferably the movement of the  Carriage takes place in a horizontal plane. The Sled and also the one that holds the sled leading The frames can be designed as required.

Because of the desired high accuracy as a preliminary product already relatively precise plastic web to be formed it is due to the high viscosity of the used Plastic necessary that means are provided with which the commissioned work in the desired working position (Co-rotation, counter-rotation) can be locked, the locking strength in the desired working position the application must meet extremely high requirements.

For locking or anchoring the application in the desired working position are therefore arresting tel provided which comprise movable wedge means, the with wedge means of the applicator into a detachable one handle, d. H. the state setting the work can be brought are.

The application or the wedge means, as a rule formed by inclined planes running against each other will be advantageously with hydraulic Actuators fixed, in principle the lockability of the application also with electrical Actuators or with combinations from hydraulic and electrical actuators can be locked.

Certain for the production of current art plastics used plastics, for example kata lysed epoxy resins, it may result from an operation malfunction of the device in the area of the applicator an exothermic reaction of the catalyzed epoxy resin come, which, as already mentioned, are explosive  can, so that measures are required, which he Known occurrence of the reaction at high speed interrupt the application process of the epoxy resin. To the rollers of the applicator are essentially for this purpose axially parallel movable relative to each other det, d. H. away from each other so that the gap between the two rollers of the applicator, for example, doubled can be.

According to a further advantageous embodiment of the Invention is the movement of the rollers by pneumatic and / or hydraulic and / or electrical movement devices causes, i.e. the movement of the rollers towards or away from each other, for example if the gap between the rollers to increase the passage of the plastic should be enlarged.

To at a recognized moment of danger with an exothermic Reaction of the plastic used Removing rollers is advantageously essentially axially parallel to the rollers of the applicator Scraper devices are provided, which can be tilted away from them are. The movement of the rollers relative to each other away as well as the tilting movement of the scraper device according to a further advantageous embodiment the device can be designed to be controllable.

The risk of an exothermic reaction when a predetermined temperature of the used plastic the resulting considerable Risk of destruction of the device and the Preventing the environment becomes advantageous according to another Embodiment of the invention the transport speed the carrier web together with the  Tilting movement of the scraper device and the movement the rollers raised away from each other, for example twice the speed of the speed, those for the formation of the plastic sheet in the commissioning plant is provided. Basically, the transport speed the film-like carrier web on which the Plastic is applied, freely adjustable, cf. above, so that depending on the preselected basic speed the carrier web the increase relative to this is adjustable in any way.

To apply the with the scraper devices in one Plastic removed in an emergency is the area below the application at least partially with a tub provided, into which the plastic can get. To the chemical reaction of the plastic collected in the tub break off, the tub is provided with coolant, the coolants are chosen arbitrarily can.

In general, a generally explosive one exothermic reaction when using catalyzed Epoxy resins as plastic for the production of art webs of fabric with the device according to the invention being able to bind is according to a very advantageous way design of the device the working temperature little at least the commissioned work on control and heating and / or refrigerant constantly stable, also Embodiments are conceivable in which the entire Device with the means described above can be kept at a constant temperature.

It is a device for application from DE-AS 11 66 667 and smoothing filler or the like known, such a device for example  to apply a leveling compound or a varnish on a The workpiece is used in a spatula and painting line. The rollers described there only have a transport function. Finally, information from the magazine WIFAG, POLYTYPE No. August 4, 1969, Bern / CH a A variety of different order schemes, as described in Coating or laminating machines are used, known.

The invention will now be described with reference to the following the schematic drawings based on an Ausfüh Example described in detail. It shows

Fig. 1 shows a typical construction of a device for the representation of the overall manufacturing process of a finished plastic web,

Fig. 2 in an enlarged scale in side view an applicator for applying plastic to an applied film- or paper-like backing sheet,

Darge presented commissioned rotated 90 ° FIG. 3 is a plan view of the FIG. 2,

Fig. 4a the interaction of the applicator with the supplied film or paper-like carrier web and the counter-pressure roller in the opposite direction and

Fig. 4b the interaction of the applicator with the supplied film or paper-like carrier web and the counter-pressure roller in synchronism.

For a better understanding of the device 10 , the overall process of producing a plastic web 11 is briefly described with the aid of the illustration in FIG. 1.

A film or paper-like carrier web in the form of paper, which is regularly silicone paper, is rolled up on a supply 100 . This paper has a repellent adhesive layer on one side, on which no glue holds. Via a cutting device 101 , the film-like or paper-like carrier web is guided via a roller guide (not described further) to a side-web control 102 and from there via a thickness measuring device, which continuously checks the thickness of the film-like carrier web 14 , to a feed mechanism 104 . The film-like carrier web 14 is fed from the infeed unit 104 to the applicator unit 13 , initially via a web tension measuring roller 134 . In the applicator 13 , against which the film-like carrier web 14 is pressed by means of a counter-pressure roller 15 arranged under the applicator, plastic is applied in a known manner, for example in the form of catalyzed epoxy resins. This process is described in more detail below with reference to FIGS. 4a, b.

The finished plastic web 11 , which is formed in the applicator 13 after the coating of the film-like or paper-like carrier web 14 , is passed over a web tension measuring roller 135 to a cooling roller 136 and passed there over a further thickness measuring device 105 , which basically has the same structure as the thickness measuring device 103 Has. From there, the finished plastic web 11 is passed to a cooling roller 106 and from there to a laminating unit 107 . Web-shaped reinforcing material 110 is fed from a supply 108 (roll-up) stored in a unwinding station 109 to a laminating unit 107 , web-like reinforcing material 110 being rolled into the plastic web 11 in the laminating unit 107 .

The web-shaped reinforcement material 110 is generally a woven fabric made of carbon fiber, glass fiber or textile material, any suitable combinations of these materials also being possible, ie being able to form the reinforcement material 110 to be rolled into the laminating unit 107 .

The web-shaped plastic material 11 , which is finished as a preliminary product and comes from the laminating unit 107 , is rolled up in the reeling station 111 and is available in this form for transport or further processing.

The applicator 13 , which forms an essential part of the device 10, essentially consists of two rollers 130 , 131 which rotate according to the arrows 139 about the respective roller axes 137 , 138 . The plastic 12 is in liquid form between the two rollers 130 , 131 , the application of the plastic 12 in such an applicator 13 being essentially known, so that the formation of a layer for application to the supplied film-like carrier web 14 is not described in more detail here needs to be. The applicator 13 is fastened on a movable frame in the form of a slide 17 in a known manner, with guides 170 , 171 of the slide 17 interacting with a frame 16 which is, for example, an integral part of the overall device 10 , cf. Fig. 1.

The applicator 13 is essentially horizontally movable in one direction in the frame 16 over the slide or the guides 170 , 171 , so that the applicator 13 can assume two end positions, cf. FIGS. 4a and 4b, in order to take a Gegenlaufpositon (a) and a synchronizing position (b) to the film-like or paper-like carrier web 14. Via movement devices 21 , which act or are arranged essentially axially parallel to the roller axes 137 , 138 , the rollers 130 , 131 can be displaced axially parallel to one another, ie towards one another or away from each other, this being described in more detail below . Scraper devices 132 , 133 are arranged on both sides of a roller 130 , 131 , which can be tilted about scraper axes 140 , 141 , the scraper axes being arranged essentially axially parallel to the roller axes 137 , 138 . The scraper devices 132 , 133 are also provided with cooling devices, which can be of any type and are not shown here in detail.

The scraper devices 132 , 133 can be tilted to the rollers 130 , 131 for contact according to the position of FIG. 2.

The applicator 13 includes wedge means 19 , ie the wedge means 19 are substantially fixed to the carriage 17 on which the applicator 13 is horizontally movable relative to the frame 16 . Wedge means 18 , which are fastened relative to the frame 16 , act on the wedge means 19 of the applicator 13 . In Fig. 3 a position of the two wedge means 16 , 17 to each other is shown, in which the applicator 13 is fixed relative to the frame, ie firmly anchored.

The wedge means 18 , which are arranged relative to the frame 16 , can be released via actuating devices 20 , which can be actuated hy draulically, electrically, pneumatically or in any other way, so that the two wedge means 18 , 19 out of engagement as he is shown in Fig. 3 come. If the two wedge means 18 , 19 come out of engagement with each other, the applicator 13 , ie the carriage 17 of the applicator 13 can be moved relative to the frame 16 , so that both positions shown in Fig. 4a, Fig. 4b can be taken who can . Once the predetermined position has been assumed, the actuating devices 20 are again put into operation, so that the carriage 17 can again be fixed relative to the frame 16 in the desired position. The provision of wedge means 18 , 19 to create a fixation of the carriage 17 to the frame 16 has the advantage that a highly resilient anchorage is created in this way, so that even highly viscous plastics 12 , for example catalyzed epoxy resins, can be used without shifting the Wal zen 130 , 131 or the carriage 17 to cause frame 16 .

Depending on the desired thickness of the plastic web 11 to be produced , the applicator 13 is brought into a counter-rotating position or a synchronized position, as shown in Fig. 4a, b. A counter-rotation, in which the immediate applicator roller, in Fig. 4a roller 130 , comes into contact with the counter-pressure roller 15 is chosen if, for example, plastic web thicknesses of 150 g / m ² are to be achieved, a synchronism according to Fig. 4b, at which the roller 131 is in contact with the counter-pressure roller 15 is selected if plastic web thicknesses of 10 to 150 g / m ² are to be achieved. With the device 10 according to the invention, plastic web thicknesses of a maximum of 850 g / m ^{2 are} possible.

As already mentioned at the beginning, 10 plastic webs 11 of predetermined thickness can be produced as a preliminary product with the device according to the invention, which are already so precise that the final thickness to be set by carrying out the plastic web 11 produced by a calendering machine only requires small forces, so that the temperature when performing the plastic web 11 through the calendering increases only unessentially. It should be possible to use plastics in the device according to the invention which, like catalyzed epoxy resin, exhibit explosive exothermic reactions when a predetermined temperature is exceeded. For this reason, a predetermined temperature must be maintained during the entire manufacturing process of the plastic sheet 11 . For this purpose, the working temperature we at least the applicator is kept constant via control and heating and / or refrigeration means, the heating, cooling and control means are not shown in detail here, since they can be of any suitable type.

It is under certain working conditions and in the event of malfunctions of the device 10 cannot be excluded in all cases that the temperature of the plastic used, at which the highly exothermic reactions begin, is reached or exceeded. In order to ensure in any case that the device is not destroyed, the gap for the passage of the plastic 12 between the rollers 130 , 131 is enlarged, while at the same time the scraper devices 132 , 133 on the rollers 130 , 131 by rotation about their axes 140 , 141 can be folded. The resin 12 located on the rollers 130 , 131 is scraped off and falls into troughs 22 arranged below the rollers, in which the plastic 12 is collected. In order to abort the chemical reaction of the plastic or to prevent further reaction, the tubs 22 are cooled by any suitable coolant. The movement of the rollers 130 , 131 away from one another in the event of the occurrence of an exothermic reaction while the scraper devices 132 , 133 are folded in at the same time can be carried out completely automatically. The movement of the rollers 130 , 131 away from one another can be caused by the movement devices 21 , which in turn can be actuated by hydraulic, pneumatic or electrical action. Simultaneously with the enlargement of the gap of the rollers 130 , 131 and the folding of the scraper devices 132 , 133 , the transport speed of the film-like carrier web 14 or the plastic web 11 formed after passage through the applicator 13 can be increased, the enlargement, for example, up to one Doubling the speed of the plastic web 11 or the carrier web 14 can lead. All of these processes can be initiated automatically when the exothermic reaction is detected when the temperature is exceeded.

It should also be pointed out that in principle plastics 12 can also be used which, when a certain ambient temperature is reached, do not, as described above, show exothermic reactions, but endothermic reactions. The same applies analogously to the preceding illustrations of the consequences of exothermic reactions for endothermic reactions, but then he must follow a heat supply instead of an intended cooling. Accordingly, all of the described parts of the device, which comprise coolants, are also to be understood in such a way that when endothermic reactions occur, heat means are used to increase the temperature.

Reference symbol list

10 device
100 stock
101 cutter
102 Side edge control
103 thickness gauge
104 feed mechanism
105 thickness gauge
106 chill roll
107 laminating unit
108 reeling
109 Unwind station for reinforcement material
110 web-shaped reinforcement material
111 reeling station
11 plastic sheet
12 plastic
13 commissioned work
130 roller
131 roller
132 scraper device
133 doctor device
134 web tension measuring roller
135 web tension measuring roller
136 cooling roll
137 roller axis
138 roller axis
139 arrow
140 doctor axis
141 scraper axis
14 film-like carrier web
15 counter pressure roller
16 frame
17 sledges
170 leadership
171 leadership
18 wedge means
19 wedge means (application)
20 actuating device
21 movement device
22 tub

Claims (16)

1. Device for the production of running plastic webs, in particular from catalyzed epoxy resins, comprising an applicator for applying the resin to a film or paper-like carrier web, the applicator comprising two rollers, and at least one counter-roller with which the carrier web can be pressed against the applicator , and means for transporting the carrier web to the application unit and for transporting the finished plastic web away from the application unit, characterized in that the application unit can be moved in two end positions in such a way that the counter-pressure roller ( 15 ) is used to create synchronization with the carrier web ( 14 ). with one roller ( 131 ) of the applicator or to create a counter-rotation with the other roller ( 130 ) of the applicator in engagement. 2. Device according to claim 1, characterized in that the counter-pressure roller ( 15 ) is immovably formed relative to the carrier web ( 14 ). 3. Apparatus according to claim 1, characterized in that the counter-pressure roller ( 15 ) is designed to be displaceable relative to the carrier web ( 14 ). 4. The device according to one or more of claims 1 to 3, characterized in that the rollers ( 130 , 131 ) of the applicator ( 13 ) are adjustable relative to the counter-pressure roller ( 15 ). 5. The device according to claim 4, characterized in that the rollers ( 130 , 131 ) of the applicator ( 13 ) on a in guides ( 170 , 171 ) in a frame ( 16 ) at least horizontally movable carriage ( 17 ) is attached. 6. Device according to one or both of claims 4 or 5, characterized in that means are provided with which the applicator ( 13 ) can be locked in the desired working position (synchronization, counter-rotation). 7. The device according to claim 6, characterized in that the locking means comprise movable wedge means ( 18 ) which can be brought with wedge means ( 19 ) of the applicator ( 13 ) in a releasable, the applicator ( 13 ) locking engagement. 8. The device according to one or more of claims 4 to 7, characterized in that the applicator ( 13 ) with hydraulic and / or electrical actuating devices ( 20 ) can be fixed. 9. The device according to one or more of claims 1 to 8, characterized in that the rollers ( 130, 131 ) of the applicator ( 13 ) are substantially parallel to one another movable. 10. The device according to claim 9, characterized in that the movement of the rollers ( 130 , 131 ) is effected by pneumatic and / or hydraulic and / or electrical movement devices ( 21 ). 11. The device according to one or more of claims 1 to 10, characterized in that substantially axially parallel to the rollers ( 130 , 131 ) of the applicator ( 13 ) and scraper devices ( 132 , 133 ) which can be tilted from the outside are provided. 12. The device according to one or more of claims 1 to 9, characterized in that the movement of the rollers ( 130 , 131 ) relatively away from each other and the tilting movement of the scraper devices ( 132 , 133 ) can be controlled together. 13. The apparatus according to claim 12, characterized in that the transport speed of the carrier web ( 14 ) together with the tilting movement of the scraper devices ( 132 , 133 ) and the movement of the rollers ( 130 , 131 ) can be increased away from each other. 14. The device according to one or more of claims 1 to 13, characterized in that the area under the applicator ( 13 ) is at least partially provided with a trough ( 22 ). 15. The apparatus according to claim 14, characterized in that the trough ( 22 ) is provided with coolants. 16. The device according to one or more of claims 1 to 15, characterized in that the working temperature of at least the applicator ( 13 ) via control and heating and / or cooling means can be kept constant.