DD250090A5 - METHOD FOR PRODUCING PREPREGS AND METAL-CIRCULATED PCB BASE MATERIAL AND DEVICE FOR CARRYING OUT THE METHOD - Google Patents

Abstract

The invention relates to an economical, cost-effective and technically easy to handle manufacturing process for prepregs and PCB base material that is widely used in electrical engineering / electronics. The essence of the invention is that a Impraegniermittel is used for Impraegnierung the material webs, which contains a catalyst-accelerated resin system and the impraegnierten material webs are pressed together with the aufzukaschierenden metal foils. To carry out the method, a device with a double belt press is used, the u. a. equipped with appropriate heating and cooling zones as well as supply and Abfuehreinrichtungen. Fig. 1

Description

Method and apparatus for producing prepregs and metal-clad printed circuit board base material

Field of application of the invention;

The invention relates to a method and an apparatus for producing prepregs and metal-clad base material for printed circuit boards, which are used in electrical engineering / electronics.

Characteristic of the known state of the art;

It is known to produce metal-clad base materials for printed circuit boards by crimping cut, thermosetting resin sheet materials and metal foils in platen presses. Such a method provides base materials with varying quality within the single plate and from single plate to single plate. The pressing process takes, for example, eleven presses including heating and cooling for 2 hours.

22.1.87- 402936

From GB-A-2 108 427 a method is known in which an infeeding is carried out in such a way that a introduced into the press, sprinkled with resin powder fabric web and a copper foil each resting during the pressing process and the press product in a press having two hotplates is ejected cyclically. Again, the quality varies within the single plate, which, if the consumer homogeneous quality is desired, leads to large amounts of committee. In addition, an economical operating speed can not be achieved with the known resins.

The use of continuous double belt presses, as e.g. are known from the production of decorative laminates ago, so far has also not been successful, because with the commonly used for circuit board base resins resins economically viable operating speed can not be achieved.

In the known from the literature process for the production of printed circuit board base material a long pressing time of sometimes over 2 hours is required. This long pressing time in the conventional multi-day presses and the usual thermosetting resin is partly due to the fact that rapid heating or rapid cooling under pressure must be avoided in order to minimize the quality differences between the outer and inner floors and within the individual floors , These differences in quality are partly due to the sliding flow, which leads to different thicknesses between the edge parts and the middle parts of the individual panels with too rapid heating or cooling under pressure. Furthermore, it is customary to use higher-quality starting materials in the layer construction for the outer layers of the boards in order to achieve a better surface finish. However, the use of starting materials of different densities leads to a certain

Inhomogeneity of the layer structure .. In addition, a complex storage and a corresponding control during processing is necessary.

Object of the invention:

The aim of the invention is to provide an economical, cost-saving and technically easy-to-use solution, with the simultaneous quality assurance of the time required significantly reduced and a perfect homogeneity of the layer structure can be achieved.

Presentation of the essence of the invention:

The invention has for its object to shorten the pressing times consistently and eliminate the extremely adverse sliding flux through changes in the feedstock and the pressing technology.

According to the invention the object is achieved in that the impregnation of the material webs a catalyst-accelerated resin system containing impregnating agent is used and that the impregnated material webs are pressed together with the or to be laminated metal foils. Particularly favorable results are achieved when a resin system with an accelerated epoxy-hardener-Kätalysatorsystem is used for impregnation, namely, when pyridines and / or imidazole, optionally substituted, is included as an accelerator.

Gate-part results are also achieved if phenolic curing catalyst systems are also included in the resin system used for impregnation.

By the process according to the invention, it is possible that by the use of catalyst-accelerated resin systems

the performance of the impregnation plants is increased by about 20 % compared with the use of conventional resins for the production of printed circuit board base material. In particular, it is advantageous that the invention allows the implementation of the method in a continuous manner. For this purpose, the material webs impregnated with the accelerated resin system according to the invention can be processed continuously or intermittently in double-belt presses. The faster onset of the accelerated resins faster heating and rapid cooling is possible under pressure and at the same time the flow and thus the dreaded sliding flow is restricted. The thickness tolerance between the edge portions and the center portion become significantly smaller, resulting in increased production reliability, lower scrap and narrower tolerance range of the obtained printed circuit board base materials.

The processing in one or more days presses, however, where a significant reduction in the sliding flow can be observed, is however not excluded.

As accelerators in the epoxy-hardener-catalyst system are u.a. the following pyridine compounds are suitable:

2-Benzoylpyridine 3-Benzoylpyridine 4-Benzoylpyridine 2-Benzylpyridine 3-Benzylpyridine 4-Benzylpyridine 2-Benzylaminopyridine 4-Dimethylaminopyridine 2-lCe thoxypyridine 4-tert-Butylpyridine 3-Cyanopyridine 2-Hydroxypyridine

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£ * 3 U

6-amino-2-pyridine 2-aminopyridine 3-ethylpyridine 3-ethyl-4-methylpyridine 2-phenylpyridine 2,6-diaminopyridine 3-methylpyridine 2- (aminomethyl) -pyridine 2-amino-4-methylpyridine 2,4- * dimethylpyridine

A second advantageous group of accelerators for this purpose are the known substituted imidazole compounds, including the imidazoles themselves, and zar:

N-methylimidazole 2-methylimidazole 2-phenylimidazole 4-phenylimidazole 4-methylimidazole 2-methylbenzimidazole 5,6-dimethylbenzimidazole 1-methyl-2-phenylbenzimidazole 1,2-dimethyliraidazole 4 »5-diphenylimidazole 2-ethyl-4-methylimidazole carbonylimidazole imidazole

2-undecylimidazole 1-cyanoethyl-2-phenylimidazole 2-phenylbenzimidazole

Particularly good results are achieved by a combination of the abovementioned pyridine or imidazole accelerators with the dicyandiamine or benzyldimethylamine known as hardeners by conventional resins.

With these accelerated resin-hard catalyst systems according to the invention, the curing time is reduced to about 2 minutes. The practical elimination of the dreaded sliding flow also achieves a product of exceptionally high quality.

The accelerated resin-hardener catalyst system may contain from 0.2 to 0.8 % by weight of the accelerator or accelerator mixture based on the solid resin. The pressing process can take place under vacuum. Often, a heat treatment of the process product has proven to be advantageous.

In most cases, it is proceeded so that individual, impregnated with the accelerated resin system Matesrialbahnen unwound from different roles and merged with at least one of a further roll unwound, aufkaschierenden metal foil web, optionally simultaneously, and in that to form a multilayer printed circuit board base material thus formed tape cyclically in the press, preferably double belt press, introduced and hot pressed. The material webs can be cut to the final length before the pressing process and then enter the pressure-effective zone together with the metal foil web, which may have been cut to final length. It is also often proceeded so that not compressed sections of the base material are formed between the pressed portions of the circuit board base material or at least one metal foil connection is left between the pressed sections.

Before or after cutting in their relative position to each other, the webs of material can be fixed by brackets, Meten, stapling or the like in the edge region and then cyclically introduced into the press. If two or more printed circuit board base materials laminated on one or both sides with metal foil are to be produced, then

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for hot pressing between, the webs "or sections of release films simultaneously introduced into the press and thus pressed and the materials thus obtained after pressing by means of the release films separated again.

Advantageously, the procedure is such that in a first cycle, the material and be laminated metal foil webs are introduced into a Heißpreßzone and then cooled in a second cycle under pressure in a cooling zone and finally trimmed in the third cycle, the PCB base material at the edge and optionally cut to length. It is also possible to introduce the webs in a nip in the first cycle and there to heat by means of high frequency and then cool down there and then cut and cut the circuit board base material in the second stroke.

When merging or cutting the material and metal foil webs, clean room conditions or vacuum should be present. It has also proven itself to preheat the aufzukaschierenden metal foils.

Double belt presses have proven particularly useful for the inventive method. They allow a continuous or at least partially continuous production. In this case, compared to a one-floor press used for heating and cooling, the combination of a conventional one-floor press as a heating zone of a second conventional one-floor press as a cooling zone within a known from the actual double belt press ago ago steel band pair, which is cyclically moved with short-term pressure relief, proved to be particularly suitable.

In such a modified double belt press, the application of a pressure in the required orders of magnitude up to 80 bar and above without any special effort and in addition

exactly controllable Porm regarding pressure equality and temperature possible. In general, presses have been proven with pressures up to 100 bar.

Regardless of whether heating and cooling are carried out in one zone, optionally cooled Einzugsumlenktrommelpaare are arranged in front of the nip in general. Before the double belt press devices for storing, unwinding and guiding the webs of material and the metal foil webs can also be provided in the feed direction. The heating zone is often provided with insulation to avoid excessive heat radiation. For the metal foil webs, it is possible to provide heatable draw-in deflection drums, which can likewise be equipped with heat shields for reducing or controlling the radiant heat acting on the material webs.

In the outlet region of the device, a pull-out deflection drum pair is generally provided. In addition, edge trimming devices and optionally trimming devices can be provided.

On the one hand, circuit boards of 1.5 mm and on the other hand circuit boards of 1.6 mm, whose tolerances according to standard ί 0.13 mm may be used, are currently marketable. With the method according to the invention, the tolerances are within 1.52 mm at the edge and 1.55 mm in the middle of the individual panels, with the result that you can make do with a single product, since the product produced by the process according to the invention within the tolerances for both products is located. The production-related advantages including advantageous storage etc. are obvious.

So far, for example, for a 1.5 mm printed circuit board

2

four layers of glass fabric a 230 g / m and three layers a 200 g / m used and for 1,6 mm thick printed circuit boards six layers

2 2

a 200 g / m and two layers a 230 g / m. In the method according to the invention, it is now possible to use a single quality glass fiber fabric for the unit product, which

• 2

For example, consists of eight layers a 200 g / m. It follows that the more expensive quality of 230 g / m is no longer necessary with the corresponding logistical advantages.

Perner is thereby achieved a perfect homogeneity of Lagenauf construction, since only a single fiberglass type of fabric is used.

Thanks to the tremendous acceleration of the curing process according to the invention compared with the known, conventionally accelerated resin systems, it is now possible to manufacture economically in one-day presses, which, moreover, makes possible a further increase in quality than the unavoidable differences between the products in multi-day presses the outer and inner floors are omitted.

Even with a processing of the material webs impregnated with the accelerated resin system according to the invention into a multi-daylight press, e.g. achieved under vacuum in addition to high freedom from pores, an improvement of the geometric values. This effect is presumably due to the combination effect, i.e. on the one hand the use of the accelerated resin system and thus the elimination of the dreaded slip flow and on the other hand the vacuum. As a result, a narrowing of the tolerances, which is always desirable in electronics, is achieved, which results in production-related interesting aspects.

Embodiment:

With reference to the embodiment of an apparatus suitable for carrying out the method according to the invention shown in the accompanying drawings, the invention will now be explained in more detail. Show it:

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Pig. 1: the gate direction according to the invention using a double belt press,

Fig. 2: the input part of the press after Pig. 1.

The one in the Pig. 1 device has a double belt press 1 with a heating press 1 with a heating press 2 and one of these downstream cooling press 3. The double belt press 1 according to the invention operates with cyclic feed. The heated zone 2 and the cooled zone 3 have the same dimensions. In a preferred embodiment, a heating zone and a cooling zone, each 3 meters long and 1.3 meters wide, are provided. The double belt press has in front of the pressure-effective zone 2 on a feed-Umlenktrommelpaar, which can be cooled, laach the cooling press 3 is a suitably ausgestaltetes extract-Umlenktrommelpaar provided.

Prior to the double belt press, two spindle spindles are used for prepregs, i. glass fiber fabric provided with the resin system and another spindle spinner having two spindles for the metal foils, i. in the present pail for copper foils, arranged. Guide rollers are provided between the spindle winders for the material webs or for the metal foils.

In the direction of production behind the double belt press is a Randbeschnittvorrichtung and then a cutting device.

In the following, the puncture manner of the double belt press according to the invention will be briefly described. Of the Spindelabwicklern four prepreg sheets, which are impregnated with the present invention accelerated resin system, withdrawn, brought together and introduced cyclically in the Heizpreßzone. At the same time, two further spindles of the spindle

k! 50 - 11 -

Developer for the metal foil copper foils delivered. In a first working cycle, the material webs are pressed together with the metal foils. The possible pressure is up to 100 bar.

If only one side laminated base material is prepared, instead of the copper foil, a heat-resistant release film can be wound onto the corresponding spindle and run into the double belt press. As a release film, e.g. a siliconized or polytetraethylene laminated aluminum foil can be used. After release from the double belt press, the release film can be pulled off the finished base material web and reused.

Kach the pressing takes place a short-term, almost complete pressure relief and the cyclic feed of the pressed section into the cooling zone, v / o the bonded base material is cooled under pressure. Hach completion of the cooling process, the base material is transported on and brought in the subsequent edge trimming device and the cutting device to the desired dimensions.

The final product is interconnected by non-compressed, ie unusable, portions which precipitate as waste. The temperature in the heating zone is about 190 C. In the subsequent cooling zone, the base material web is cooled to about 100 ^° C. Between cooling zone and edge trimming device, a Uachtemperierzone for the Pormstabilisierung of the base material may be arranged.

Although the method according to the invention has been illustrated by means of a six-layered base material, it is of course also possible to produce such with a different layer number.

Further, by using release liners, it is possible to make several base material layers simultaneously.

The operating conditions described are primarily dependent on the accelerated resin system used and can be varied accordingly.

The method according to the invention or the device according to the invention can be used not only for laminating with copper but also with other metal foils. In particular, they are suitable for lamination with combination films, e.g. Cu / Al, as used for fine circuit boards (so-called etchible / stripable boards).

The material losses that occur in the above-described method due to the non-pressed sections are of some economic importance. To avoid this waste, the prepreg sheets are already cut to the final final length in a special Ausfülirungsform and thus introduced at an appropriate distance between the metal foil webs in the press. In a further particular embodiment, the metal foils are cut to length before the press. It is very important to make sure that no dust arises bz /. by appropriate means such as vacuum, the resulting dust is kept away from the prepreg and metal foil surfaces. Bs has also been found to be useful to mechanically fix the material sections in their relative position to each other, which is e.g. can be done by stapling, stapling or riveting in the edge area to be cut off later anyway. In this way, a quasi-continuous process is achieved while avoiding material losses.

It has proven to be advantageous in principle to heat the copper foils. Such preheating is sometimes more or less inevitably due to the fact that the externally applied copper foils are in any case more heated than the glass geeks. In a particular embodiment of the double belt press according to the invention, which in Pig. 2

is shown, the catch drums are arranged at a greater distance from each other and heated for the purpose of heating the guided on the catch drums along metal foils. Following the feeder Umlenlcrollenpaar support rollers are provided for the steel bands. In order to prevent heating of the parts of the prepreg webs that are located downstream of the draw-in deflection drum pair, a heat shield pair is provided. This can consist of a cooled sheet metal. As cooling serve cooling coils, which may consist of copper, in which the flow rate of a coolant is controllable, so that an accurate temperature control is achieved. Instead of the cooling coils and coolers can be provided with forced operation. The heat shields are arranged displaceably in the horizontal direction so that the prepreg webs in this particular embodiment can also be protected in terms of their spatial arrangement as required from the temperature effect of the inlet drums heated in this embodiment. ,

In a further particular embodiment, the prepreg web which has already been brought together can in turn be slightly preheated over the entire length of the next cycle feed in order to bring about an even more rapid start of the resin in the heating zone.

The press according to the invention finds another application

for the production of metal-clad base material for printed circuit boards, if instead of the glass fiber tissue paper and instead of the inventively accelerated epoxy-based resin system, a correspondingly accelerated resin system based on phenol is used. The combination of the cheaper starting materials with the quasi-continuous or short-cycle press enables particularly economical production.

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The invention will be further illustrated by the following examples.

example 1

A finished-look glass fabric, as is usually the case with copper-clad glass-fiber epoxy resin laminates

used for printed circuit boards weighing

2,200 g / m was reacted with a resin solution consisting of 100 parts of a polymeric, partially brominated bisphenol A glycidyl ether with an epoxidized ITO content of 1 to 15%, preferably 5 to 12 %, 3 parts 2 dicyandiamide, 0; Soaked 28 parts of 3-methylpyridine and 80 parts of methyl glycol. The soaked and dried at 165 0 prepreg had a resin content of 42 % and a resin flow of 10 %. Seven of these prepregs were at a rising to 195 ⁰ C temperature under a pressure of 55 bar. Pressed on the inventive device with double-sided 35 / thick copper foil support to a 1.5 mm thick laminate. The test of the laminate surprisingly gave above-average positive results in dimensional stability with properties otherwise equivalent to commercial laminates.

The resulting laminate has a thickness tolerance of - 3 / 100mm. Comparatively, the standards for rigid laminates provide a tolerance of ί 13/100 mm, which has been fully exploited by the products.

Example 2

A glass fabric as listed in Example 1 was treated with a resin solution consisting of 100 parts of a polymeric, partially brominated bisphenol A glycidyl ether with an epoxidized hovelloccin content of 1 to 15 %, preferably from 5 to 12 %, 3.4 parts of dicyandiamide , 0.33 parts of 4-dimethylaminopyridine and 80 parts of methyl glycol soaked. The soaked

and at 170 ⁰ g of dried prepreg had a resin content of 44% and a resin flow of 8%, Several of these prepregs were at double-sided 35 / um copper foil pad ~ a 200 ⁰ C temperature rising at a pressure of 50 bar in the inventive apparatus to a 1.5 mm thick laminate pressed. In this version, the test of the laminate also showed values above the standard in the dimensional stability with otherwise comparable laminate properties to commercially available products.

Example 3

With a resin mixture consisting of 100 parts of a polymeric, partially brominated bisphenol A-glycidyl ether with an epoxidized ITovolackes proportion of 1 to 15 %, preferably from 5 to 12% and with an epoxide equivalent weight between 350 and 520, 3.0 parts of dicyandiamide , 0.40 parts of 2-amino-4-methylpyridine and 80 parts of methyl glycol, a 100 g / m heavy glass fabric of the same use as set forth in Example 1, was soaked and dried at 165 ⁰ C. The resin content was 44 % and the resin flow was 10%. Two of these prepregs were pressed with one-sided 35 ^ thick copper foil pad using a release film at a temperature rising to 190 ⁰ C under a pressure of 50 bar on the device according to the invention to a 0.2 mm thick laminate. The test gave equally good results as in Example 2.

Examples 4 to 13

The formulations or operating conditions of Examples 4 to 13 are summarized in the table below.

example 4 VJL 6 • 7 8th "9 10 11 12 13 Resin content Epoxy equivalent weight Proportion of epoxidized novolak in the base resin Dicyandiamide Methylglycol 100 350/510 5 3,3 80 100 350/520 5 3,3 80 100 400/500 5 3,3 80 100 400/500 5 3.0 80 100 360/410 10 3.0 80 100 360/410 10 3.4 80 100 360/410 10 3,1 80 100 360/500 5 3,2 80 100 360/500 10 3, '2. 80 100 360/500 15 3.0 80 Benzyldimethylamine 0.10 0.15 0.10 0.20 0.14 0.18 Carbonyldiimidazole 0.17 0.24 4-methylimidazole 0.27 0.21 2-methylimidazole 0.28 0.15 2-methylbenzimidazole 0.22 0.18 2-phenylimidazole P 30 0.21 2-ethyl-4-methylimidazole 0.21 0.22 0.29 2-amino-4-methylpyridine 0.28 ¹ 0.30 4-dimethylaminopyridine 0.2 0.19

continuation

example 4 ul 6 7 8th 9 ' 10 11 12 13 4-tertiary-butylpyridine 0.16 0.17 3-benzyl pyridine 0.25 0.15 ρ glass mesh g / m 200 200 200 200 200 100 100 48 100 48 Lackiertemp. b. Prepreg distribution 160 160 170 165 165 170 · 160 165 165 160 Härzgehalt 43 43 44 44 43 49 48 50 50 60 resin flow 8th 9 8th 10 9 11 10 8th 9 8th Preßtemp. (Max.) 195 190 190 195 190 190 195 195 190 190 i Pressing pressure in bar 40 45 50 50 50 45 50 45 45 40 Laminate thickness mm 1.6 1.5 1.6 1.2 1.0 0.17 0.54 0.05 0.25 0.15 Cu coverage 35 / U e = one seixig / z = zv / one side e Z e Z Z Z Z Z Z Z release film X - X - - - - - - -

co ι

Example 14

f ₂

A Bjsjmwollpapier with a weight of 110 g / m was mixed with 33 g of a phenolic resin solution consisting of 40 % of an aqueous low molecular phenol Präimprägnierharzes, 5> 2 % tetra-brombisphenol-a, 4 »8 % of a Polyalkylenglykoldigly-

cidylesters and 50 % solvent soaked.

The paper thus impregnated and dried at 120 ^° C. to 170 ^° C. had a resin content of 2 * 3 % and a fraction of volatile constituents below 2 % , measured at 160 ^° C. for 5 minutes.

Subsequently, a further impregnation with 190 g of a resin formulation consisting of 42.6 parts of a modified Diglycidylesters a dimer acid, 13 »5 parts of tetrabromobisphenol-a 2.9 parts of antimony trioxide, 1.8 parts of dicyandiamide, 0.7 parts of 2-phenylmidazole with 38.5 parts of methyl glycol.

The soaked twice and dried at 110 ⁰ C to 180 ⁰ C paper had a resin flow of 7 % g.

Six of these prepregs were pressed into a 1.6 mm thick laminate at a temperature rising to 210 ° C. Under a pressure of 45 bar on a double belt press with double sided 35 micron thick Cu foil overlay.

Examination of the laminate surprisingly gave above-average positive results in punchability with solder bath resistance that was well above the level of conventional fr2 laminates.

Claims (20)

1 to 4j characterized in that additionally dicyandiamine and / or benzyldimethylamine is included. Anspruch [en] A process for producing metal-clad printed circuit board base material by pressing in the heat of webs impregnated with thermosetting resin with the metal foil (s) to be laminated in a pressing device, characterized in that for impregnating the webs, an impregnating agent containing a catalyst-accelerated resin system is used and that the impregnated material webs are pressed together with the or to be laminated metal foils. 2 .. The method of claim 1, characterized in that the impregnating agent contains a resin system accelerated epoxy hardener catalyst system. 3. The method according to claim 1 or 2, characterized in that the impregnating agent contains a phenol hardener catalyst system as an accelerated resin system. 4. The method according to one or more of the claims 1 to 3j characterized in that the resin system contains as accelerator one or more compounds from the following groups: substituted pyridine compounds, imidazole and / or substituted imidazole. 5. The method according to one or more of the claims 6. The method according to one or more of the preceding claims 1 to 5, characterized in that the accelerated resin-hardener catalyst system contains 0.2 to 0.8 wt .- % of the accelerator or the accelerator mixture, based on the plating resin. 7. The method according to one or more of the preceding claims, characterized in that the pressing operation takes place in a vacuum. 8. The method according to one or more of the preceding claims 1 to 7, characterized in that unwound for the formation of a multi-layer circuit board base material impregnated with the accelerated resin system webs of different roles and at least one, unwound from another roll, optionally be brought together at the same time to be laminated metal foil and that the tape thus formed cyclically in the press, preferably double belt press, introduced and hot pressed. 9. The method according to one or more of the preceding claims 1 to 8, characterized in that the material webs are cut to the final length before the pressing and then enter together with the optionally cut to final length metal foil web in the pressure-effective zone. Method according to one or more of the preceding claims 1 to 9, characterized in that non-compressed portions of the base material or a metal foil connection are left between compressed sections of the printed circuit board base material. 11. The method according to one or more of the preceding claims 1 to 10, characterized in that the band-shaped materials before or during cutting in their relative position to each other by stapling, riveting, stapling or the like fixed in the edge region and then cyclically introduced into the press , 12. The method according to one or more of the preceding claims 1 to 11, characterized in that in the first cycle, the materials and aufzukaschierenden metal foil webs are introduced into a heating press zone, that takes place in the second cycle, a cooling under pressure in a cooling zone and that in the third working cycle, the printed circuit board base material is trimmed at the edge and optionally cut to length. 13. The method according to one or more of the preceding claims 1 to 11, characterized in that introduced in the first cycle, the tracks in a nip and heated there by high frequency and then subjected to cooling and that in the second power stroke, the printed circuit board base material trimmed at the edge and optionally cut to length. 14. The method according to one or more of the preceding claims, characterized in .daß that the aufzukaschierende metal foil or metal foils are vorgewännt. 15 Apparatus for carrying out the method according to one or more of the preceding claims 1 to 14s characterized by a double belt press with cyclic advance, the press has a heating zone and a subsequent cooling zone, in front of the heating zone, an optionally cooled feeder-Umlenktrommelpaar and after the cooling zone an extract-UmIenktrommelpaar is arranged. 16. A device for carrying out the method according to one or more of the preceding claims 1 to 14 »characterized by a double belt press with cyclic feed, the press has a first zone, in which a capacitive heating by high frequency and then cooling takes place, and upstream of the nip an optionally cooled intake UmIenktrommelpaar, and then a pull-pulley pair is arranged. 17. Device according to one of the claims 15 or 16, characterized in that before the double belt press in the feed direction means for storing, unrolling and guiding the webs of material and the metal foil webs are provided. 18. Device according to one of the claims 15 or 16, characterized in that before and after the heating zone insulation to prevent or limit the Tfärmeab radiation are provided. 19 · Device according to one of the claims 15 or 16, characterized in that heatable intake deflecting drums for the metal foil webs and heat shields to protect the webs of material from radiant heat are provided. - 19 claims; 20. Device according to one of the claims 15 or 16, characterized in that behind the pullout Umlenktrommelpaar Randbeschnittvorrichtungen and optionally a Ablängevorrichtung are provided. - For this 1 sheet drawing -