DE3000574A1 - Composite foil esp. toilet seat cover - has impermeable facing of extruded thermoplastics foil and water-soluble backing - Google Patents

Abstract

Composite sheet of foil, intended esp. as a toilet seat cover, comprises at least two layers, one being a thin, water-insoluble sealing layer produced by extrusion of a foil from thermoplastics to produce absolute freedom from pores. The other layer is a water-soluble, thicker support layer. The other side of the support layer may have a textile facing of individual fibres. The sealing layer and support layer are pref. seal-bonded together. By using an extruded foil for the impermeable facing layer, absolute freedom from pores is achieved; by contrast, earlier methods using a solvent with subsequent evaporation led to minute bubbles which form the seats of pores. The support layer is pref. of an alkaline-soluble, low-viscosity block polymer of vinyl acetate with a small content of crotonic acid, esp. containing deposits of soda. The sealing layer is pref. of alkaline-soluble esteric resin of phthalic acid and pentaerythrite.

Description

Composite film, especially toilet

seat cover, as well as method and device for their production.

The invention relates to a composite film, in particular a toilet seat cover, of at least two layers, with at least one thin outer, usually in water insoluble sealing layer with a water-soluble, less thin carrier layer is optionally connected via one or more intermediate layers, as well as a Method and apparatus for producing this composite film.

A toilet seat cover made of such a composite film is made of the German Offenleguflgsschrift 27 03 005 known by the applicant. In the preparation of The individual layers of the composite film are penetrated by this toilet pad Application of solutions of the film materials to suitable substrates and evaporation the solvent produced. However, this procedure is relatively complex, since the appropriate evaporation equipment is required and also the handling with organic solvents requires special precautions. aside from that Has it has been shown that the sealing layer does not have the desired freedom from pores, which is due to the fact that when the solvent evaporates from the The film of the sealing layer forms bubbles which, when dry, result in pores.

The invention is therefore based on the object of providing a composite film to create the type described above, their freedom from pores in comparison to the known film is improved and which can be produced more easily and cost-effectively leaves.

This object is achieved in that at least the sealing layer the film by extruding one in water only with the help of a solubilizer detachable thermoplastic plastic is formed pore-free. Preferably the other layers of the film are also produced by extrusion.

The fact that individual or all layers of the composite film by extrusion are formed is a complete tightness from the side of the sealing layer ensures that the individual foils can be extruded pore-free. aside from that With the help of an extruder, the layer thickness of the individual foils can be made much easier be varied than in the production of the individual layers from solutions of the Case is, whereby the structure of the composite film and the ratio of the material thicknesses Easily adapt the individual layers to one another for the respective purpose let. during the solving process according to the German Offenlegungsschrift 27 03 005 pay attention to this when choosing the material for the individual layers had to be that different solubilities in the preparation of the layers Solvents used were present in order to dissolve an already prepared To avoid the next layer when applying the next one, this problem exists with the "dry process" according to the invention not. The materials for the individual layers can rather are selected according to the properties they should have in the finished product.

In particular when the composite film is a toilet seat cover represents, the side of the film facing away from the sealing layer has a textile Coating made of individual fibers that are anchored in the top of the film or with these are glued. The length of the fibers can be limited to one another are matted, are in the range of about 0.01 to 2 mm or higher. Bring the fibers -a mechanical reinforcement of the film and prevent it from shrinking and gluing. Nevertheless, the film can be completely dissolved after use, because the fibers tangled with each other in a certain way but not permanently with each other are connected. The fibers used are preferably those made from cellulose, in particular Cotton used. But other fibers are also suitable.

The sealing layer and the next and possibly further layers are preferably connected to one another over a large area, in particular welded. You can but also by loosening one and / or the other surface or with help be glued with an adhesive. The sealing layer and the carrier layer exist preferably from the same, in water usually insoluble, Plastic, with the carrier layer additionally containing solubilizing additives and contains the sealing layer. These additives can be used in the carrier layer evenly distributed or in the border area to the sealing layer in a higher concentration are present. This usually depends on how thick the sealing layer is and how easily the insolubility in water can be achieved with the help of the solubilizer can be converted into a solubility. The carrier layer, if it consists of an in Water-soluble material, such as polyvinyl alcohol, is also free of solubilizing agents Be additives, in which case an additional intermediate layer can be provided, which contains the solubilizing additives and between the sealing layer and Carrier layer is arranged.

Since the sealing layer does not need to be self-supporting, can they are usually kept very thin, since it has been shown that a layer thickness from 1 to 5 to, in particular, 2 to 3 .mu.m is already completely sufficient to achieve the desired To achieve tightness. As a rule, the layer thickness of the sealing layer is therefore The thickness of the carrier layer depends on how many additional layers the composite film still contains and what mechanical loads they can withstand target. In particular if there is no further plastic layer apart from the sealing layer is provided, but the carrier layer is provided with a textile covering, lies their layer thickness as a rule between approx. 5 to 50, in particular 10 to 12 μm.

Such plastics are suitable as material for the sealing layer, those in water and the normally occurring neutral aqueous solutions are not are soluble, through suitable solubilizers, in particular acids or bases but can be made soluble. The carrier film, on the other hand, can consist of a water-soluble one or delayed soluble plastics such as polyvinyl alcohol. It is also possible with advantage for the sealing layer and also for the carrier layer the same plastic that is not soluble in water or

to use the same plastic mixture and that for the carrier layer to make the plastic used soluble by incorporating the solubilizer. The plastics must of course be those that can be extruded are. Suitable extrudable plastics are solid copolymers of vinyl acetate and a small part of crotonic acid, which are present as a low-viscosity block polymer and are alkali-soluble. Such a block polymer is, for example, under under the name Vinnapas C 305 sold by Wacker-Chemie GmbH, Munich. Another suitable product is an ester of phthalic acid and pentaerythritol in the form of an ethanol- and alkali-soluble hard resin, such as that from BASF under the name Phthalopal PP as a hard resin for the production of paper varnishes and wood varnishes is sold. These plastics can be in the form of mixtures with each other and with soft resins, common plasticizers, fillers and other additives are present. It has been found to be especially useful for the sealing layer is advantageous if they are still elastic Contains additives, which is particularly useful for toilet seat covers to achieve slip resistance has a beneficial effect. The rubber-elastic or rubber-like elastomer additives do not need to be solvable by the solubilizer, but what in particular then it is advantageous if they are contained in larger quantities in one layer. Since such additives increase the elasticity of the film and prevent it from sticking together Can prevent composite films from sticking together, they are also advantageously in the carrier layer contain. A proportion of block copolymers with a Polystyrene-polybutadiene-polystyrene structure proved to be particularly preferred.

The individual layers of the composite film can also consist of mixtures consist of plastics.

The sealing layer can, however, also be made entirely of an elastomer thin exist, which is modified in such a way that it is with the help of a solubilizer is soluble in water. The carrier layer can also be made from such an elastomer exist and then contain this solubilizer at the same time. Such an elastomer is advantageously one in which carboxyl groups are incorporated and its Molecular size is so limited that it can still be found in water with the help of alkaline substances can be resolved. Such an elastomer can be one based on butadiene and an unsaturated carboxylic acid copolymerizable with butadiene, in particular Be crotonic acid.

The invention also relates to a process for continuous Manufacture of a layer consisting of at least two interconnected layers Composite film, especially one that is essentially from one side is waterproof and water-soluble from the other side. This procedure is characterized in that the individual preferably all Layers of the film made of thermoplastic materials with the appropriate properties formed by extrusion and bonded together. The individual Layers are extruded as separate films and then connected to one another. The connection is preferably made while the foils are still hot and sticky by simply lying on top of one another. However, as already mentioned, the surfaces can can also be made sticky afterwards.

In one embodiment of the invention, the two layers extruded through a coextrusion nozzle and thereby connected to one another. Through this a particularly intimate connection is obtained. However, it should be in this embodiment care must be taken that the components of the two layers are so on top of one another are coordinated that any waste that may arise in one or the other extruder are reusable without the material composition of the layers being disadvantageous to influence. Waste containing solubilizers is used for production a backing layer or intermediate layer containing the solubilizer is reused.

As a rule, the individual films come out of the extruder thicker than corresponds to the desired thickness in the composite film. In this case it will be the films stretched to the desired thickness, which can be done individually or in combination can.

In one embodiment of the invention, the method is used for production of composite films with cutouts and / or edges deviating from the straight line. In this embodiment, the edges and / or cutouts are continuous Way trimmed thermally, in particular by cut-off welding. It is possible to carry out the trimming in a composite of at least two layers.

However, the layers of the composite film are in the form of individual films produced, which are connected to one another, then these individual films are preferred trimmed in time with tools that deal with the trimmed Move the foils along with them and then place them on the foils that have already been trimmed Cut the foils to fit these precisely. This creates the so-called registration problem bypassed in a simple manner. Should the composite film, as it is with an endless belt from toilet seat covers is the case, periodically recurring edge shapes and / or Have cutouts, then it is preferred for the formation of these endless belts an endlessly revolving conveyor used on which the trimming devices arranged in an integral multiple of the period of the recurring edge shapes are. By trimming the individual foils at spatially separate locations it is possible to separate the waste formed by trimming the individual foils to be collected and returned to the associated extruder for reuse. For a similar reason, it is also preferred to coat the surface to make the composite film with textile fibers only when the composite film, if so, is trimmed, thereby avoiding the film waste are undesirably mixed with fibers.

The invention also relates to a device for implementation of the method according to the invention and for producing the composite film. The device is characterized in that it has at least two extruders with associated wide slot or ring nozzles and at least one device for continuous removal and Has merging of the films formed. It is preferably at least a separating device that can be moved along with the foils to detach provided by edge strips and / or cutouts, at least one of the aforementioned Devices is arranged on an endless conveyor or from this is formed. The extruders and nozzles are preferably to form coextrusion devices summarized.

Should the composite film in the form of strips or blanks with periodic recurring edge shapes and / or cutouts are produced, then has the surface of the conveyor device, preferably the shape of the composite film to be produced, wherein the edges of the surface are fringed by separators. As separators separation welding wires or separation welding tapes are preferably provided, which the Edges of the surface of the conveyor limit and slightly above the surface survive to achieve the separation. The conveyor is advantageous than a roller, in particular a hollow roller, is formed. Under the surface of the conveyor, in particular under the roller surface in the area of the places where the cutting of the foils takes place, suction devices for collecting and returning of the separated film residues A flocking device is an advantage provided at a point in the direction of movement of the conveyor, the behind the trimming points, whereby it is achieved that only the surface parts the composite film can be provided with the textile covering, which is attached to the desired endless belt remain.

The diameter of the roller can range in size from about 25-00 to 3000 mm, so that there is a circumference of over 9 m. From this it can be seen that a circumferential length already has a large number of individual period lengths, e.g.

of toilet seat covers, which results in a high withdrawal speed, combined with sufficient cooling of the film results. If desired, can however, the diameter of the roll can also be kept much smaller, e.g. 1 m or less, especially if there are still cooling rollers between the extruder and the roller and if necessary, stretching rollers are provided for the film. The upstream of Cooling and forging rolls is particularly advantageous when the individual layers the composite film are connected to one another in a coextrusion nozzle.

There are numerous possible uses for the film according to the invention, which are mainly in the packaging sector. Eliminating no more Usable packaging materials is a significant problem today. This can be eliminated by the film according to the invention, since after use it in Water or aqueous solutions can be dissolved and in their material properties can be composed in such a way that the substances which go into solution are harmless or are even biodegradable. Since the composite film of the invention made of thermoplastic Materials, the packaging can be made of the film by welding or Sealing to be tightly closed. Lockable ones are particularly advantageous or closed bags made of the composite film according to the invention in the form of so-called Function packs, which will be discussed later. Included own All forms of packaging have the property that they can be thrown away after use Dissolve in an aqueous medium or if moisture enters, e.g. outdoors, rot within a short time.

In a preferred embodiment of the invention, the film has the shape of a sack, bag, pouch, carrier bag or the like, wherein the wall, .jeweils is designed so that they both on their inner as also has a sealing layer on its outside. This can be achieved thereby that two carrier foils are placed on top of one another to form a wall that their water-soluble sides are facing each other and the sealing layers pointing outwards. In this way, the bags and the like are insensitive to moisture. If, on the other hand, the bags are torn open mechanically after use, water can be released get between the water-soluble layers of the film, so that the films and so that the bags and the like can dissolve. But it is also possible that the Form the composite film in such a way> that a water-soluble carrier layer on both sides is provided with a sealing layer. After mechanical destruction This film is also completely dissolvable because the water is between the sealing layers penetrate into the film and the carrier layer and then the sealing layers can solve. In this embodiment it is also possible to use the carrier layer to be made porous on the inside or to be provided with an absorbent insert, as a result of which the penetration of water into the carrier layer and thus the dissolving process is accelerated.

As mentioned above, depends on the thickness and the composition the carrier layer essentially depends on the desired properties, in particular on the mechanical strength of the composite film. The thickness of the backing layer respectively.

the carrier layers can be up to 0.5 mm or even up to 1 mm, there are no limits here. Also can be in the views or between the layers still have reinforcements inserted, preferably taking care of this is that the reinforcements in turn easily disintegrate during the dissolving process, such as this is the case, for example, with individual fibers. Has the composite film the soluble side and / or a textile covering on the sealing layer, then they are also suitable as single-use bed linen, and removing them is no problem represents.

It is also possible, e.g. for tubular packaging, that to produce composite film according to the invention in the form of tubular goods or blown film, For which it is equally necessary to provide corresponding annular extruder nozzles.

The physical and also the chemical properties of each Layers of the composite film can be varied in that for these layers Plastic formulations are used, their composition in appropriate Way is varied. So can the dissolution rate for the composite film be reduced by the fact that less readily soluble or not readily soluble substances in disperse phase or in dissolved form in the materials of the individual layers be stored. Conversely, Can also be used with a carrier layer made of an ester of phthalic acid and pentaerythritol, the amount of alkali required for solubilization can be reduced in that a water solubility of the ester by appropriate Modification is generated.

If desired, one and / or the other layer can also contain the Stickiness-increasing additives are incorporated.

This is the case with a carrier layer made from an ester of phthalic acid with pentaerythritol proved to be advantageous to mix in a non-drying pressure sensitive adhesive (e.g. Lutonal M 40), whereby the relatively hard ester is plasticized and at the same time a desired tack for flocking with textile fibers is generated. Naturally additional adhesives can be used to coat the textile fibers, such as polyvinylpyrrolidone, which is applied to the surface layer to be covered with the fibers be applied.

Esters of pentaerythritol and a polybasic organic acid, such as phthalic acid are usually produced by a melt reaction, whereby work can also be carried out in the presence of a solvent, with the help of which the water of reaction can be removed azeotropically. It can be used for the esterification even monocarboxylic acids and other additives can be used to make a suitable Modification to aim. It has now been found that it is possible from the at the melt obtained after the esterification after removal of the water of reaction Manufacture moldings without the melt solidifying in the meantime. On the one hand, this eliminates the difficult melting process, as is the case with esters Let pentaerythritol and phthalic acid be avoided, on the other hand In this way, additives mix in easily, what before and / or after Formation of the ester can take place. The esterification becomes useful in a particular Reaction vessel carried out with the extruder via a pipeline for the Melt is connected, but can also in the extruder, which is equipped with a degassing device is equipped to be carried out by yourself.

This procedure in particular allows the sealing layer and / or produce the carrier layer of the composite film described at the outset. Included it is again possible to work with extruders with coextrusion nozzles, whereby an ester melt is fed to the nozzle gap intended for the formation of the carrier layer that already contains the solubilizer.

Suitable plasticizers can also be added to the melt, i.a. also plasticizers in the form of acetals of pentaerythritol or esters of pentaerythritol with in particular branched fatty acids with 5 to 9 carbon atoms.

Further features of the invention emerge from the following description of preferred embodiments in connection with the drawing and the claims.

In the drawing, FIG. 1 shows a cross section through a composite film according to the invention, FIG. 2 shows a section of an endless band of the composite film according to Fig. 1 in the form of lined up toilet seat covers, Fig. 3 a schematic representation of a device for producing the endless belt according to Fig. 2, Fig. 4 is a side view of the roller according to Fig. 3 in the direction of the arrow A and FIG. 5 a schematic representation of another embodiment of the invention Device for producing the composite film.

The composite film 1 shown in Fig. 1 is composed of three layers. A carrier layer 2 with a thickness of approx. 10 to 12 μm consists of an alkali-soluble one Esters of phthalic acid and pentaerythritol, as it is called by the company BASF Phthalopal PP is sold and has a softening point of 90 to 10'ob and an acid number of 190 to 205.

In addition, the carrier layer can also contain plasticizers, soft resins and / or contain other additives. The carrier layer is due to a content of alkali, water-soluble like soda and / or sodium stearate, because when exposed to water the The milieu becomes alkaline as a result of the dissolution of soda and thereby the carrier layer able to dissolve. The underside of the carrier layer is only about 2 to 3 # around a strong, completely pore-free sealing layer 3 made of the same material as provided for the carrier layer 2, but this does not contain any embedded alkali contains, which is why the sealing layer is insoluble in neutral aqueous solutions is. The two layers are fully welded or glued to one another.

On its side facing away from the sealing layer 3, the carrier layer has 2 has a covering 4 made of textile fibers which are anchored in the carrier layer 2 and are exposed to the surface for most of their length. With the fibers it is cellulose fibers with a length of approx. 0.1 to 1 mm. The topping from the textile fibers has different tasks. So he prevents that proportionately thin composite film shrinks during handling and the surfaces together stick, as is often the case with thin foils.

Furthermore, the covering has heat-insulating properties and is capable of also absorb a certain amount of moisture without affecting the composite film is dissolved. The composite film is completely water-soluble, with a dissolution but can only take place if water attacks the side of the composite film, on which it is provided with the textile covering. That is where the copolymer is from vinyl acetate and crotonic acid because of the incorporated sodium carbonate, as above mentioned, water soluble. As in the dissolution of the carrier layer 2 and the sodium carbonate an alkaline medium is formed, the thin sealing layer of this becomes Medium with resolved. If, on the other hand, water only comes to the surface of the sealing layer 3, then this water does not like to attack the sealing layer, so that the entire composite film remains unaffected The composite film is particularly suitable for the production of toilet seat covers, but it can be used with particular advantage can be used wherever protection against moisture and wetness is required is, especially in the case of packaging, and on the other hand an environmentally friendly disposal of the consumed material is sought. The foil can also be of great advantage be shaped into a functional bag. Such a bag has the sealing layer on the outside, then it is suitable for storing fabrics that are dry or the water-soluble backing layer is unable to dissolve. If you open the Bag and bring it together with water, then it dissolves and gives his Content free. If the sealing layer is on the inside, the pouch can contain aqueous not alkaline active substances are stored, e.g. bath additives and the same. Becomes the still closed bag with its water-soluble outside given in water, it dissolves and releases its contents.

The endless belt 5 shown in FIG. 2 is made up of a large number of lined up toilet seat covers 6 together, which along common perforated lines 7 related. Own the toilet seat pads 6 themselves a shape which is adapted to the usual shape of the toilet seats. They are also different Variations possible, as they are already known for such editions.

The apparatus shown in Figs. 3 and 4 for the production of the Endless belt 5 of toilet seat pads 6 is essentially composed of two extruders 8 and 9 and one provided with a drive, not shown rotatable roller 10, the outer circumference of which is an even multiple of the length of the Toilet seat covers and their maximum width the maximum width of a toilet seat cover or a multiple thereof. In the illustration shown in FIG the roller can be driven counterclockwise. The surface 11 of the roller 10 represents a two-dimensional impression of the development of the endless belt of one another lined up toilet seat covers 6. It has the shape of the endless belt 5, wherein the points corresponding to the surface parts of the endless belt are also flat are formed and the cut-out points or cut-off edge points of the endless belt is also formed as recesses in the surface 11 of the roller 10 are. The surface 11 can depending on the desired properties the end made of plastic or metal. The edges of the roller surface 11 are in the form of the edge lines and the recess edges of the endless belt 5 with separating welding bands 12 occupied, which are connected to suitable power sources for heating. With help The endless belt 5 from the toilet seat covers 6 can produce these separating welding bands be cut out of one or more sheets of film.

The two extruders 8 and 9 are offset along the circumference of the roller arranged and for extruding thin sheets of thermoplastic material set up, the width and the thickness of the slot die 13 of each extruder is set up so that the width of the films, if necessary after a stretching process, slightly wider than the width of the roller surface or

of the endless belt and a film with the desired material thickness is formed. The first extruder, seen in the direction of movement of the roller, is used for the production of an approximately 2 to 3 µm thick film to form the essentially Neutral aqueous solutions are insoluble but soluble in alkaline solutions Sealing layer of the composite material. Between the slot nozzle 13 of the Extruder 8 and the roller 10 can also deflecting, not shown in the drawing and stretching rollers can be provided for supporting and dimensioning the for themselves serve alone not load-bearing foil. This film is when placed on the roller 10 trimmed by the Trennschwe.3bands 12. To the appropriate cut is now one of the second extruder 9 formed in a corresponding manner but thicker Foil applied or laminated. This film has a thickness of approx. 10 to 12 um and serves to form the carrier layer of the composite film. It contains sodium carbonate or stearate, which together with the preferably Esters of phthalic acid and pentaerythritol containing soft resins and / or plasticizers is extruded. When it hits the roller 10, the second film is in a corresponding manner Cut like the first film with the help of the separating sealing strips 12. The connection the two foils are made flat by welding, which can be done, as long as the two foils are still hot and soft or with the help of a suitable one Heat source are made sticky on the surface.

Stationary sauna tricks 14, 15 are located inside the roller and 16 are provided, the first suction funnel 14 being in the area of the support point the first film and the second suction funnel 5 in the area of the support point of the second Slide is located. Waste pieces of the two foils are separated by these suction funnels discharged so that they can be returned to the respective extruders for reuse without contamination can be fed back.

The third suction funnel 16, which is immediately following the Second suction funnel is located, there is a flocking device on the outside of the roller 17 assigned. This device has one directed towards the roll surface Box 19 in which in the middle a nozzle 18 for supplying a fiber air mixture is arranged on the free surface of the carrier film. The fibers are preferred inflated onto this layer while its surface is still sticky. It is but also possible the surface becomes sticky due to suitable heating to make or smear them with a solvent or glue. Of the The outer annular space 20 of the box 19, like the suction funnel 16, is used for suction of excess fibers, but they can also be used to suck in additional cooling air be provided.

To remove the now finished composite film from the roller, there are two further rollers 21 and 22 are provided, which can also be designed as cooling rollers and with them, if desired, also a compression or a stretching the composite film can be exercised. The endless belt 5 can then be removed from the toilet seat covers 6 can be folded in a packaging machine and packed in output boxes.

The invention is not limited to the embodiment described here limited. Rather, numerous modifications are possible without affecting the frame the invention is abandoned. A composite film can also be produced in this way, which has much thicker layers for its use as packaging material. It is also possible to produce the composite film from several views, with individual Layers are not fully connected to the next, but bulges with # have air cushion inserts, as is the case with deep-drawn cushioning materials the case is.

In the embodiment shown in FIG. 5, the device a coextrusion device with two extruders for the production of the composite film 23 and 24, the outputs of which are combined in a coextrusion nozzle 25.

The extruder 23 serves to supply the material for the sealing layer and the extruder 24 for feeding the material for the water-soluble carrier layer. For picking up and pulling off the composite film leaving the extrusion nozzle 25 two cooling rollers 27 and 28 serve the two layers with the aid of which the composite film 26 is simultaneously stretched to the desired extent. An air knife 29, which is above the The landing point of the film 26 on the first cooling roller 27 is used for additional purposes Cooling and for pressing the film against the cooling roller.

After leaving the cooling roller 28, the composite film itself is ready and can be supplied to a wide range of # further ~ direct line facilities.

For the purpose of producing endless lengths of toilet seat covers in this embodiment is again one which is provided with cut-off welding devices Roller 30 is provided, the diameter of which is approximately 50 cm and the surface of which is a Represents development of the endless belt of toilet seat covers, with three full Supports are formed on the roller surface and bounded by welding tapes are. This device is used to suck off the cut-off film waste a suction funnel 31, since the film when it hits the roller is already as Composite film is present. The waste is sent to the extruder 24 for the production of the Carrier layer fed back.

A heating device 32 in the form of an infrared heater is on the Roller surface just before a flocking device 33 is provided to the surface the composite film, which has already cooled, becomes sticky again when heated make so that the applied by the flocking device 33 to the film surface Flakes of Fibers also stick. Otherwise corresponds to Embodiment of FIG. 3.

L e r s e i t e

Claims (36)

Composite film, in particular toilet seat cover, and method and apparatus for their manufacture. Ansprtiche il composite film, in particular toilet seat cover 9 at least two layers, with at least one thin outer, usually in water insoluble sealing layer with a water-soluble thicker at least single-layer carrier layer is connected, characterized in that at least the sealing layer (3) by extruding a film made of a thermoplastic Plastic is formed pore-free. 2. Composite film according to claim 1, characterized in that the the side of the film facing away from the sealing layer (3) a textile covering (4) comprises single fibers. 3. Composite film according to claim 1 or 2, characterized in that the sealing layer (3) and the carrier layer (2) connected to one another over a large area, in particular welded are. 4. Composite film according to one of claims 1 to 3, characterized in that that the sealing layer (3) and the carrier layer (2) are made of the same thermoplastic There are plastic and the carrier layer solubilizing additives for themselves and for the sealing layer. 5. Composite film according to one of Claims 1 to 4, characterized in that that the carrier layer consists of an alkali-soluble, low-viscosity block polymer consists of vinyl acetate and a small amount of crotonic acid, in which as alkali preferably soda is stored. 6. Composite film according to one of claims 1 to 5, characterized in that that at least the sealing layer is made of an alkali-soluble ester resin Consists of phthalic acid and pentaerythritol. 7. Composite film according to one of the preceding claims, characterized in that that the carrier layer has a thickness of 5 to 500 vum, in the case of a toilet seat cover with a textile surface layer in particular a thickness of 10 to 15 μm and the Sealing layer have a thickness of 1 to 10 μm, in particular 2 to 3 μm. 8. Composite film according to one of the preceding claims, characterized characterized in that it has at least three layers and two of these layers consist of water-soluble material, which are like a bubble composite film are formed with welded air cushions. 9. Composite film according to one of the preceding claims, characterized characterized in that the sealing layer and / or the carrier layer contain a content on a rubber-like elastomer, in particular alkali-soluble elastomers owns. 10. Composite film according to one of the preceding claims, characterized characterized in that the sealing layer and / or the carrier layer of a acid- or alkali-soluble elastomers, in particular based on rubber, formed will. 11. Composite film according to claim 9 or 10, characterized in that that the elastomer is a copolymer based on butadiene and a copolymerizable with butadiene unsaturated carboxylic acid, especially crotonic acid. 12. Composite film according to one of the preceding claims, characterized characterized in that it is in the form of a sheet suitable for packaging, a Hose or bag is present. 13. Composite film according to one of the preceding claims, characterized characterized in that it is in the form of two individual films, the water-soluble ones Sides are facing each other and their sealing layers are the outsides form. 14. The composite film according to claim 13, characterized in that the The water-soluble pages lie loosely together. 15. The composite film according to claim 13, characterized in that the water-soluble sides have a porous intermediate layer that can be removed even by water are connected to each other. 16. Process for the continuous production of one of at least composite film consisting of two interconnected layers, in particular one one which is essentially waterproof from one side and from the other Side is water-soluble, characterized in that the individual layers The sheet of thermoplastics is extruded and molded together get connected. 17. The method according to claim 16, characterized in that the individual Layers extruded as separate films and then connected to one another, in particular be welded. 18. The method according to claim 16, characterized in that at least two layers extruded together through a coextrusion nozzle and thereby with each other get connected. 19. The method according to claim 16 or 17, characterized in that at least one of the separately extruded films is extruded thicker than desired and stretched to the desired material thickness before joining with the other film or is stretched. 20. The method according to claim 16 or 17, characterized in that at least two layers are stretched as a composite. 21. The method according to any one of claims 16 to 20 for the production of Blanks made of composite films, in particular with cutouts and / or straight lines different edges, characterized in that the blanks thermally, in particular cut continuously by cutting. 22. The method according to claim 21, characterized in that for production Individual films serving the composite film are trimmed one after the other with tools that move with the trimmed foils and that follow on cut the already trimmed foils to fit them exactly. 23. The method according to claim 21 or 22, characterized in that the film for the formation of periodically recurring cutting patterns on an endless one Conveyor device, in particular a roller, are placed on the separating welding devices are in an integral multiple of the period, and that the foils when applied are clipped to the conveyor. 24. The method according to any one of claims 21 to 23, characterized in that that the waste formed by the trimming of the individual foils, depending on the foil collected separately and returned to the associated extruder. 25. The method according to any one of claims 16 to 23, in which at least a backing layer and at least one sealing layer prior to trimming are connected to one another, characterized in that incurred during trimming Waste pieces with a solubilizer content are sent to the extruder for production are fed to the carrier film. 26. The method according to any one of claims 16 to 25, characterized in that that a free top of a film, preferably after trimming with textile Fibers is coated. 27. Process for the production of moldings, in particular films, from esters of pentaerythritol with polyvalent organic acids, in particular Phthalic acid, and possibly Monocarboxylic acids, - characterized in that the pentaerythritol and the acid or its anhydride in a manner known per se, possibly with admixture of additives esterified by fusing and the ester formed without prior Solidification is extruded directly to the moldings. 28. The method according to claim 27, characterized in that the esterification in one separate from the extruder but with it via a line for the melt connected reaction vessel and / or in the extruder itself. 29. The method according to claim 27 or 28, characterized in that the film as a sealing layer and / or carrier layer for a composite film according to any one of claims 1 to 15 is extruded. 30. Apparatus for the production of blanks from composite foils, in particular those with non-parallel edges and / or recesses, characterized in that that they have at least two extruders (8, 9) with associated slot extrusion nozzles (13), at least one device (10) for continuous pulling off and merging of the sequences formed and at least one separating device that can be moved along with the foils (12) for trimming the blanks, in particular cutting off edge strips and / or Cutouts, having at least one of these facilities on an endless Conveying device (10) is arranged or is formed by this. 31. The device according to claim 30, characterized in that the Surface (11) of the conveyor device (10) the shape of the composite film to be produced (1) and fringed the edges of the surface of the separating device (12) will. 32. Apparatus according to claim 30 or 31, characterized in that that the separating device of Trennschweißbä.ndern (12) is formed, the dte in corresponding to the edge shapes and / or cutouts of the composite film to be produced Lines on the surface (11) of the conveying device (10) are arranged in an electrically insulated manner and are connected to appropriate power sources. 33. Device according to one of claims 30 to 32, characterized in that that the conveyor is a roller (10). 34. Device according to one of claims 30 to 33, characterized in that that under the surface (11) of the conveyor (10) at the points where the separation of the foil panels from the web takes place, in each case devices (14 15) are arranged to catch and return the separated film residues. 35. Device according to one of claims 30 to 34, characterized in that that it has a flocking device (17) which is attached to the surface (11) of the conveyor device (10) faces and is located at a point along the conveyor, those seen in conveying movement behind the bodies for the circumcision of the on the Conveyor guided foils lies. 36. Device according to one of claims 30 to 35, characterized in that that at least two 'slot dies combined to form a coextrusion die are.