EP2886011B1 - Method for manufacturing a panel with edge protection and frame assembly suitable for said method - Google Patents

Description

• eine Kernplatte mit einer Oberseite, einer Unterseite und seitlichen Schnittflächen,
• ein einen Außenrahmen des Kantenschutzes bildendes äußeres Profilteil aus plastifizierbarem Kunststoffmaterial, wobei das äußere Profilteil ein L-Profil mit einem die Oberseite der Kernplatte übergreifenden ersten Schenkel und mit einem sich im Wesentlichen parallel zu der Schnittfläche der Kernplatte erstreckenden zweiten Schenkel aufweist, und
• ein einen Innenrahmen des Kantenschutzes bildendes inneres Profilteil aus plastifizierbarem Kunststoffmaterial, wobei das innere Profilteil einen sich im Wesentlichen parallel zu der Schnittfläche der Kernplatte bzw. zu dem zweiten Schenkel des äußeren Profilteils erstreckenden und zwischen dem zweiten Schenkel des äußeren Profilteils und der Schnittfläche der Kernplatte angeordneten zentralen Abschnitt, einen sich von dem zentralen Abschnitt fort erstreckenden, die Kernplatte an ihrer Unterseite übergreifenden ersten Schenkel und einen sich von dem zentralen Abschnitt fort in die entgegengesetzte Richtung erstreckenden zweiten Schenkel aufweist,
• wobei der erste Schenkel des äußeren Profilteils und der erste Schenkel des inneren Profilteils den Randbereich der Kernplatte zwischen sich aufnehmen und einerseits das freie Ende des zentralen Abschnittes des inneren Profilteils mit dem ersten Schenkel des äußeren Profilteils, andererseits das freie Ende des zweiten Schenkels des inneren Profilteils mit dem zweiten Schenkel des äußeren Profilteils verschweißt ist,

indem die Kernplatte in das äußere Profilteil eingelegt, das innere Profilteil auf die Kernplatte und das äußere Profilteil aufgelegt und in das innere Profilteil Ultraschall eingeleitet wird, um das freie Ende des zentralen Abschnittes des inneren Profilteils mit dem ersten Schenkel des äußeren Profilteils und das freie Ende des zweiten Schenkels des inneren Profilteils mit dem zweiten Schenkel des äußeren Profilteils zu verschweißen.The invention relates to a method for producing a plate provided with an edge protection, in particular in the form of a table or cover plate comprising

• a core plate having a top, a bottom and side cut surfaces,
• an outer profile part of plastifiable plastic material forming an outer frame of the edge protector, the outer profile part having an L-profile with a first leg engaging over the upper side of the core plate and with a second leg extending substantially parallel to the cut surface of the core plate, and
• an inner profile part of plastifiable plastic material forming an inner frame of the edge protector, wherein the inner profile part extends substantially parallel to the cut surface of the core plate or to the second leg of the outer profile part and between the second leg of the outer profile part and the cut surface of the core plate arranged central portion, a extending away from the central portion, the core plate on its underside cross-over first leg and a fort away from the central portion in the opposite direction extending second leg,
• wherein the first leg of the outer profile part and the first leg of the inner profile part receive the edge region of the core plate between them and on the one hand the free end of the central portion of the inner profile part with the first leg of the outer profile part, on the other hand, the free end of the second leg of the inner profile part is welded to the second leg of the outer profile part,

by inserting the core plate in the outer profile part, the inner profile part is placed on the core plate and the outer profile part and ultrasound is introduced into the inner profile part to the free end of the central portion of the inner profile part with the first leg of the outer profile part and the free end to weld the second leg of the inner profile part with the second leg of the outer profile part.

• ein einen Außenrahmen des Kantenschutzes bildendes äußeres Profilteil aus plastifizierbarem Kunststoffmaterial, wobei das äußere Profilteil ein L-Profil aufweist, dessen erster Schenkel zum Übergreifen der Oberseite der Kernplatte ausgebildet ist und dessen zweiter Schenkel zur im Wesentlichen zu der Schnittfläche der Kernplatte parallelen Anordnung ausgebildet ist, und
• ein einen Innenrahmen des Kantenschutzes bildendes inneres Profilteil aus plastifizierbarem Kunststoffmaterial, wobei das innere Profilteil einen zentralen Abschnitt aufweist, welcher zur im Wesentlichen zu der Schnittfläche der Kernplatte bzw. zu dem zweiten Schenkel des äußeren Profilteils parallelen Anordnung zwischen dem zweiten Schenkel des äußeren Profilteils und der Schnittfläche der Kernplatte ausgebildet ist, und wobei das innere Profilteil ferner einen sich von dem zentralen Abschnitt fort erstreckenden ersten Schenkel, welcher zum Übergreifen der Unterseite der Kernplatte ausgebildet ist, und einen sich von dem zentralen Abschnitt fort in die entgegengesetzte Richtung erstreckenden zweiten Schenkel aufweist,
• wobei der erste Schenkel des äußeren Profilteils und der erste Schenkel des inneren Profilteils zur Aufnahme des Randbereiches der Kernplatte zwischen sich ausgebildet sind und einerseits das freie Ende des zentralen Abschnittes des inneren Profilteils mit dem ersten Schenkel des äußeren Profilteils, andererseits das freie Ende des zweiten Schenkels des inneren Profilteils mit dem zweiten Schenkel des äußeren Profilteils verschweißbar ist, wenn die Kernplatte in das äußere Profilteil eingelegt und das innere Profilteil auf die Kernplatte und das äußere Profilteil aufgelegt worden ist, und
• wobei der zweite Schenkel des äußeren Profilteils an seiner Innenseite einen Vorsprung aufweist, welcher wenigstens eine Stirnseite mit senkrecht zu dem zweiten Schenkel des äußeren Profilteils angeordneter Erstreckungsrichtungskomponente aufweist

The invention further relates to a frame arrangement suitable for carrying out such a method for producing an edge protection of a core plate

• an outer profile part of plastifiable plastic material forming an outer frame of the edge protector, the outer profile part having an L-profile, the first leg of which is designed to overlap the upper side of the core plate and the second leg of which is formed to be substantially parallel to the sectional area of the core plate; and
• a inner profile part of plastifiable plastic material forming an inner frame of the edge protector, wherein the inner profile part has a central portion, which is arranged parallel to the cut surface of the core plate or to the second leg of the outer profile part between the second leg of the outer profile part and the Sectional surface of the core plate is formed, and wherein the inner profile part further comprises a first leg extending from the central portion, which is formed to engage over the underside of the core plate, and a second leg extending in the opposite direction away from the central portion,
• wherein the first leg of the outer profile part and the first leg of the inner profile part for receiving the edge region of the core plate are formed between it and on the one hand, the free end of the central portion of the inner profile part with the first leg of the outer profile part, on the other hand, the free end of the second leg the inner profile part with the second leg of the outer profile part is welded, when the core plate has been inserted into the outer profile part and the inner profile part has been placed on the core plate and the outer profile part, and
• wherein the second leg of the outer profile part has on its inner side a projection which has at least one end face with an extension direction component arranged perpendicular to the second leg of the outer profile part

With an edge protection of plastifiable, ie thermoplastic and / or thermoelastic, plastic materials provided plates find primarily as table tops as well as for cover plates, in particular for household appliances, such as washing machines, clothes dryers, dishwashers, refrigerators and the like, widespread use. On the one hand, it is intended to protect the edge-side cut surfaces of the core plate from mechanical damage and, on the other hand, to protect the user against injuries to the cut surfaces of the plate. If the core plate, as is often the case, formed from a wood material, such as a pressboard, so the open-pore cut surfaces of such a core plate should also be protected against ingress of contaminants and moisture in particular, resulting in a swelling and consequent Deformation of the core plate can lead. Finally, the edge protection should also facilitate the grip of the plate and consequently the manageability and transportability of a household appliance provided with such a cover plate. In the latter case, the cover plate is usually also used as a storage and working surface, here with a drawn down edge protection often the other goal is pursued to cover the gap between the cover and the actual device housing and seal. In addition, in the latter case often functional parts, such as supports, locking and / or retaining hooks, screw or fastening straps, clips or the like, formed on the underside of the core plate and / or on one of the two profile parts of the edge protector, by means of which the cover plate can be fixed to the housing of the household appliance and which can also be covered by the edge protection for aesthetic reasons.

The profile parts of the outer and inner frame of the edge protection itself can in particular as injection molded parts be made of plasticizable under heat and / or pressure, thermoplastic or thermoelastic plastic materials, which should have both a sufficient mechanical stability as well as a resistance to moisture and high resistance and durability.

To produce plates provided with an edge protection made of plasticizable plastic materials, it is known, for example, to inject the plastic provided for the edge protection into an injection mold, into which the prefabricated and cut to the desired extent core plate has been inserted, so that the open-pored cut edges of the core plate are encapsulated and the plasticized plastic penetrates into the pores to interlock the edge protector with the core plate. For the reasons mentioned above, the mold space of the injection mold can in particular be designed such that the molded edge protector overlaps at least the upper side of the core plate. In this way results in a solid and at the same time tight connection of edge protection and core plate. Instead, it is also known to manufacture the edge protection in a separate operation, such as by injection molding or extrusion of a strip-like profile, and to connect in a further operation by gluing the core plate. Although both methods provide effective edge protection, but a major drawback in both cases in particular is that the edge protection can not be solved later. This problem arises for reasons of environmental protection, when the table or cover plate has become damaged or otherwise worthless or unusable and waste recycling is to be supplied or even a return obligation of the manufacturer exists (such is For example, in many household appliances including cooling furniture provided), which then has to ensure disposal and, if necessary, recycling. It is then necessary in particular a sorted separation according to materials, the recyclable edge protection with its relatively high proportion of plastic from the core plate, however, can not or only very difficult to separate.

With regard to an environmentally friendly and on the occasion of the disposal of the table or cover plate of the core plate easily separable edge protection, therefore, a generic method has proven in which a two-part edge protection with an outer frame in the form of an outer profile part and an inner frame in the form of an inner profile part for Use passes, which respectively the core plate over or under and which are welded together along at least two circumferential connecting lines ( DE 42 04 161 A1 . DE 44 06 118 A1 ).

The outer frame of such an edge protector comprises an outer profile part of plastifiable plastic material, wherein the outer profile part has an L-profile with a first leg engaging over the upper side of the core plate and with a second leg extending substantially parallel to the cut surface of the core plate. The angle between the two legs does not necessarily have to be exactly 90 °, but may also deviate therefrom, for example by up to about 30 °, if an extension of the edge protection from the upper side of the core plate is desired obliquely outwards and downwards. The second, substantially edge-parallel leg of the outer profile part may also preferably be longer than the first, substantially parallel to the plate, the plate top cross and this particular fitting Leg to project beyond the underside of the plate down.

The inner frame of such an edge protector comprises an inner profile part of plastifiable plastic material which has a central section extending substantially parallel to the cut surface of the core plate or to the second leg of the outer profile part and between the second leg of the outer profile part and the cut surface of the core plate having. It should also be noted in this connection that the central portion of the inner profile part does not necessarily have to extend exactly parallel to the edge-side sectional area of the core plate, but on the other hand also at an angle of e.g. can be arranged inclined up to about 30 °, if there is enough space between the edge of the core plate and the second leg of the outer profile part. From the central portion of the inner profile part extends on the one hand a core plate on its underside cross-over first leg, e.g. substantially perpendicular to the central portion, on the other hand extends from the central portion of the inner profile member, a second leg in the opposite direction - ie outwardly in the direction of the second leg of the outer profile part -, for. again substantially perpendicular to the central portion.

If the plate is fully assembled, the first leg of the outer profile part and the first leg of the inner profile part take up the edge region of the core plate between them, wherein at least the terminal region of the second leg of the inner profile part covers the edge of the core plate. The inner and outer profile part of the inner or outer frame of the edge protector are also connected to each other at their mutually facing legs, that on the one hand the free end of the central portion of the inner profile part with the first leg of the outer profile part, on the other hand, the free end of the second leg of the inner profile part is welded to the second leg of the outer profile part.

In procedural terms, the latter is done in a simple manner in that the core plate inserted into the outer profile part of the outer frame, the inner profile part of the inner frame placed on the core plate and the outer profile part and the two profile parts of the outer and inner frame at the aforementioned locations are welded together , For this purpose, in particular the ultrasonic welding has proven effective, wherein in the inner profile part ultrasound is introduced to weld both the free end of its central portion with the first leg of the outer profile part and the free end of its second leg with the second leg of the outer profile part. The introduction of ultrasound is carried out in particular by means of sonotrodes, which are applied with a certain, sufficient to transmit the ultrasound pressure against the outside of the freely accessible second leg of the inner profile part. In this way, an edge protection is produced in the form of a frame closed on all sides from the welded together outer and inner profile parts, which has a very high strength and dimensional stability. The core plate accommodated between the first legs of the outer and inner profile part and the central portion of the inner profile part connected to the first leg of the outer profile part is surrounded by a closed frame structure, so that their lateral cut surfaces are effectively protected from any external influences. Furthermore, the core plate can be used for disposal Relieve relatively easily from the edge protection, since it is hereby only frictionally, but not positively connected.

However, the introduction of ultrasound into the inner profile part has proven to be problematic because the ultrasonic energy can not be transmitted exactly evenly to the intended connection points between the two profile parts of the outer and inner frame, namely on the one hand to the free end of the central portion and on the other hand to the free end of the second leg of the inner profile part. Occasionally, therefore, there is a non-optimal welding of the two profile parts of the outer and inner frame, wherein in particular the distal end of the central portion of the inner profile part of the introduction region of the ultrasound is not stimulated sufficiently and / or not long enough to plasticize the same a perfect and continuous (circulating) to enter into fusion or welding connection with the first leg of the outer profile part. Thus, on the one hand, at least a local gap formation between the core plate and the cross-over legs of the profile parts of the outer or inner frame may occur, which is to be avoided for aesthetic reasons and in particular for preventing the penetration of moisture. On the other hand, at least locally bulge-like deformations of the legs of the profiled parts which overlap the core plate can occur, which likewise represents a particularly optical defect which has to be counteracted. As a result, there is a great deal of research into quality assurance and there is a committee that needs to be avoided for both economic and environmental reasons.

The aforementioned problems also arise in one of the DE 196 01 124 A1 known cover plate, which has a core plate with an edge protection, which comprises a frame assembly according to the preamble of claim 10. The frame assembly comprises an outer frame and an inner frame, which are each manufactured as injection-molded parts and are welded together at their contact points in the region of the end faces of the legs of the inner frame in a conventional manner. Structurally, the outer, the end face of the core plate cross leg of the outer profile part of the outer frame at its free end on an inside projection, which obviously serves for easier insertion of the inner frame in the outer frame, when the latter are to be welded together with interposition of the core plate. The distance between the free end of the central portion and the free end of the central portion facing inside of the free end of the second leg of the inner profile part of the known inner frame is smaller than the distance between the projection and the projection facing the inside of the upper, the core plate cross-leg of the outer profile part of the outer frame to allow a weld connection of the outer frame with the inner frame within the projection and adjacent thereto.

The invention is therefore the object of a method for producing a provided with an edge protection plate of the type mentioned in a simple and cost-effective way to the effect that a perfect, permanent and in particular vollumfängliche connection of the two profile parts of the outer and inner frame both between second legs of the outer and inner profile part and between the first leg the outer profile part and the free end of the central portion of the inner profile part is ensured. It is further directed to a suitable frame arrangement for carrying out such a method.

• Bereitstellen eines äußeren Profilteils, dessen zweiter Schenkel an seiner Innenseite einen Vorsprung aufweist, welcher wenigstens eine Stirnseite mit senkrecht zu dem zweiten Schenkel des äußeren Profilteils angeordneter Erstreckungsrichtungskomponente aufweist;
• Bereitstellen eines inneren Profilteils, bei welchem der Abstand zwischen dem freien Ende seines zentralen Abschnittes und der dem freien Ende seines zentralen Abschnittes zugewandten Innenseite des freien Endes seines zweiten Schenkels größer ist als der Abstand zwischen dem Vorsprung und der dem Vorsprung zugewandten Innenseite des ersten Schenkels des äußeren Profilteils;
• Einlegen der Kernplatte in das äußere Profilteil und Auflegen des inneren Profilteils auf die Kernplatte und das äußere Profilteil, bis das freie Ende des zentralen Abschnittes des inneren Profilteils mit dem ersten Schenkel des äußeren Profilteils in Kontakt tritt und zwischen dem freien Ende des zweiten Schenkels des inneren Profilteils und dem am zweiten Schenkel des äußeren Profilteils angeordneten Vorsprung ein Spalt verbleibt;
• Einleiten von Ultraschall in das innere Profilteil an dessen dem freien Ende seines zentralen Abschnittes abgewandten Seite und Anpressen des inneren Profilteils gegen das äußere Profilteil im Wesentlichen senkrecht zur Erstreckungsrichtung der Kernplatte, wobei zunächst das freie Ende des zentralen Abschnittes des inneren Profilteils mit dem ersten Schenkel des äußeren Profilteils verschweißt wird und sodann mit zunehmender Plastifizierung des freien Endes des zentralen Abschnittes des inneren Profilteils das freie Ende des zweiten Schenkels des inneren Profilteils mit dem Vorsprung des zweiten Schenkels des äußeren Profilteils in Kontakt tritt und ebenfalls mit diesem verschweißt wird.

In terms of process engineering, this object is achieved by a method for producing a plate provided with an edge protection of the aforementioned type, which comprises the following steps:

• Providing an outer profile part, the second leg having on its inside a projection, which has at least one end face with arranged perpendicular to the second leg of the outer profile part extending direction component;
• Providing an inner profile part, wherein the distance between the free end of its central portion and the free end of its central portion facing inside of the free end of its second leg is greater than the distance between the projection and the projection facing the inside of the first leg of the outer profile part;
• Inserting the core plate into the outer profile part and placing the inner profile part on the core plate and the outer profile part until the free end of the central portion of the inner profile part with the first leg of the outer profile part comes into contact and between the free end of the second leg of the inner Profile part and the projection arranged on the second leg of the outer profile part a gap remains;
• Introducing ultrasound into the inner profile part at its side facing away from the free end of its central section and pressing the inner profile part against the outer profile part substantially perpendicular to the extension direction of the core plate, wherein first the free end of the central portion of the inner profile part is welded to the first leg of the outer profile part and then with increasing plastication of the free end of the central portion of the inner profile part, the free end of the second leg of the inner profile part with the projection of the second leg of the outer profile part in Contact occurs and is also welded to this.

In terms of product technology, the invention provides for solving the underlying problem in a suitable for carrying out such a method frame arrangement of the type mentioned above, that the distance between the free end of the central portion and the free end of the central portion facing the inside of the free End of the second leg of the inner profile part is greater than the distance between the projection and the projection facing the inside of the first leg of the outer profile part.

The embodiment of the invention enables effective welding of the two frame parts of the outer and inner profile part of the edge protection at both locations provided by due to the excess of the distance between the free end of the central portion and the free end of the central portion facing the inside of the free end of the second leg of the inner Profile part opposite to the distance between the projection and the inner side facing the projection of the first leg of the outer profile part is ensured that in the ultrasonic excitation of the inner profile part in the region of the freely accessible, the free end of the central portion opposite side or of the second leg of the ensures that initially only the free end of the central portion of the inner profile part is in contact with the inside of the first leg of the outer profile part, while the free end of the second leg of the inner profile part (still) at a distance from the second Leg of the outer profile part or of its inner projection is arranged, whose end face is provided for welding to the second leg of the inner profile part. Consequently, the weld joint between the central section of the inner profile part and the first leg of the outer profile part, which is relatively far from the point of introduction of the ultrasound or from a sonotrode used for this purpose, is initially generated ("far field"). Only when the generation of this weld has progressed so far that the excess due to melting of the plastic material from the free end of the inner profile part or fusing this free end is used up with the inside of the first of the outer profile part, the free end of the second leg of inner profile part with the arranged on the inside of the second leg of the outer profile part projection in contact, so that these, relatively close to the point of introduction of the ultrasound or a sonotrode used for this purpose welding between the respective second legs of the two profile parts of the outer and inner frame is generated ("near field"). consequently Both welding and fusion connections between the inner and the outer profile part can be produced permanently and reliably with a certain time offset.

The distance between the free end of the central portion and the free end of the central portion facing the inside of the free end of the second leg of the inner profile part in this case, for example, by about 0.5 mm to about 3 mm, in particular by about 0.5 mm about 2 mm, to be greater than the distance between the projection and the inner side facing the projection of the first leg of the outer profile part when the two profile parts have been placed on each other in the (still) unwelded state.

The free end of the central portion of the inner profile part, which is welded to the inside of the first leg of the outer profile part, may preferably be substantially pointed. In this way, a rapid melting of the "thin" free end of the central portion of the inner profile part is achieved when introducing the ultrasonic energy into the inner profile part to provide a proper and continuous weld.

Moreover, it may be advantageous if the contact region of the inner side of the first leg of the outer profile part is limited to the free end of the central portion of the inner profile part at least in the direction of the free end of the first leg of the outer profile part of an inwardly projecting nose. In this way, it is prevented during the pressing of the inner profile part against the outer profile part, that shifts the free end of the central portion of the inner profile part along the first leg of the outer profile part, so that an exact positioning of Welded connection at the intended location results. This is especially true in the event that the inside of the first leg of the outer profile part does not extend exactly perpendicular to the central portion of the inner profile part, such as in the case that the first leg of the outer profile part under a more or less large radius or with the interposition of a chamfer or bevel merges into its second leg and the connection with the central portion of the inner profile part (still) in the region or at the edge of this radius' should take place.

In order to further ensure proper positioning of the two profile parts of the outer and inner frame of the edge protection relative to each other at least during the ultrasonic welding, can be provided in an advantageous embodiment of the method according to the invention that the outer profile part and the inner profile part at least during the introduction of ultrasound in the inner profile part are pressed against each other substantially in the extension direction of the core plate. Consequently, the two profile parts are pressed against each other not only substantially perpendicular to the extension direction of the plate to each other to press the sections to be welded together and provide the desired contact pressure, but also substantially parallel to the extension direction of the core plate to compensate for any tolerances and optical defects to avoid.

In a preferred embodiment of the method according to the invention may be further provided in particular that the thickness of the core plate is selected such that it is smaller than the distance between the facing inner sides of the first leg of the outer and inner profile part, when the inner profile part under contact of his central portion has been placed on the first leg of the outer profile part on the outer profile part. Consequently, at least at the beginning of the welding operation, when the free end of its central portion has not undergone any loss of material due to melting, the first leg of the inner profile part engaging over the underside of the core plate has (still) a certain distance from the underside of the core plate, so that at the ultrasound excitation of the inner profile part uncontrolled vibrations are introduced into the core plate and virtually all the ultrasonic energy for generating the - temporally first - welded joint between the central portion of the inner profile part and the first leg of the outer profile part is available.

The thickness of the core plate should in this case by an amount smaller than the distance between the facing inner sides of the first leg of the outer and inner profile part, when these have been placed on each other, be selected, this measure at least the difference of the distances on the one hand between the free end the central portion and the free end of the central portion facing the inside of the free end of the second leg of the inner profile part, on the other hand, between the projection and the projection facing the inside of the first leg of the outer profile part corresponds. In this way, it is ensured that the first leg of the inner profile part which engages over the underside of the core plate at the earliest then comes into contact with the lower side of the core plate during the production of the welded connections, if an already between the central section of the inner profile part and the first leg of the outer profile part Welding or fusion has come about. This measure can be smaller in particular its difference between the distances between the free end of the central portion and the inside of the free end of the second leg of the inner profile part facing the free end of the central portion, on the other hand between the projection and the inner side of the first leg of the outer facing the projection Profile part, so that the first leg of the inner profile part only then comes into contact with the underside of the core plate and is able to initiate this ultrasonic energy, although the welded joint between the free end of the second leg of the inner profile part and the inside projection on the second leg of the outer Profile part has been generated at least partially. The Lesser measures of the thickness of the core plate with respect to the distance between the facing inner sides of the first leg of the outer and inner profile part, if they - have been placed on each other - unswelded, thus conveniently about the difference in the distances between the free end of the central portion and a the inner side facing the free end of the central portion of the free end of the second leg of the inner profile part, on the other hand between the inside projection and the inner side facing the projection of the first leg of the outer profile part plus the Schweißmaßes the welded joint between the inside projection of the first leg of the outer Profile part and the second leg of the inner profile part amount. In this way, the core plate provided with such a suitable thickness can serve the displacement path of the inner profile part in the direction of the outer profile part (in the normal direction with respect to the extension plane of the core plate) when pressing the two profile parts together during the ultrasonic welding to limit, whereby the required welding dimensions of the two connection points of the profile parts are ensured as a result of melting of the local polymer material as soon as the first leg of the inner profile part comes to rest on the underside of the core plate. With "welding dimension" in this context, the difference in length is addressed, which results from the melting or melting of the polymer material of the free end of the second leg of the inner profile part with the inside projection on the second leg of the outer profile part.

As such from the above-mentioned DE 44 06 118 A1 As is known, according to an advantageous embodiment of the method according to the invention it can be provided that the inner profile part is placed on the core plate in such a way that a gap remains between its central portion and the sectional area of the core plate. The outer dimensions of the core plate should therefore be chosen such that they are at least slightly, such as up to a few millimeters, smaller than the bounded by the central portion of the inner profile part of the inner frame space. In this way, the core plate, especially when heating or cooling of the same, can expand or contract, so that even in case of thermal cycling of provided with the edge protection plate according to the invention ensures that it does not warp or bend the edge protection or even destroyed.

In order to ensure proper tightness of the clamping connection of the core plate between the first legs of the inner and outer profile part, it has also proven to be advantageous if between the first leg of the outer profile part and the core plate and / or between the first leg of the inner profile part and the core plate at least one seal is arranged, which is also able to attenuate any vibrations of the ultrasonically excited profile parts during their welding together so that they are not introduced into the core plate.

The frame assembly according to the invention may be advantageously designed for this purpose such that the first leg of the outer profile part and / or the first leg of the inner profile part has at least one, in particular terminal, projecting in the direction of the core plate projection, which at its the free end of the respective first leg of the outer and / or inner profile part opposite end to receive the seal and prevents outflow or flow thereof over the free end of the respective first leg addition. Moreover, such a projection can provide for a particular desired optical lamination of the respective seal. The respective projection may rest in particular in the finished welded state of the lower and / or upper side of the core plate, wherein the thickness of the seal should be greater than the length of the respective projection (viewed perpendicular to the extension plane of the core plate) should be selected for one to ensure a proper sealing function to ensure sufficient compression of the seal (s) in the welded state of the two profile parts of the outer and inner frame of the edge protection. The seals used here are advantageously elastic, in particular permanently elastic, wherein they are so welded to the core plate during welding of the two profile parts of the outer and inner frame by the respective, the core plate cross-over (first) leg be pressed that results in a completely gap-free seal.

For the reasons already mentioned above, as far as possible prevention of the uncontrolled introduction of ultrasound into the core plate during the ultrasonic welding of the two profile parts of the outer and inner frame can be provided in an advantageous embodiment of the method according to the invention, moreover, that the core plate at least during the introduction of ultrasound in the inner profile part, in particular clamping, is fixed. This can be done for example by means of conventional hold-down clamp the plate against a suitable support.

In a further advantageous embodiment of the method according to the invention, the ultrasound can be introduced into the central section of the inner profile part substantially in the extension direction, wherein the ultrasound is in particular introduced into a substantially L-shaped recess between the central section and the second leg of the inner profile section , The L-shaped recess serves on its outer side facing away from the core plate as a contact surface for a sonotrode for introducing ultrasound into the inner profile part of the inner frame, wherein it makes it possible, the introduction point for the ultrasound as close to the discharge point far, free end of the zoom in on the central portion of the inner profile part. It may therefore preferably be provided relatively close to, but opposite to, the first leg of the inner profile part.

With regard to an advantageous embodiment of a frame arrangement according to the invention can thus be provided that the inner profile part between its central Section and its second leg has a substantially L-shaped recess, which is preferably arranged near the lower side of the core plate cross-first leg of the inner profile part.

• eine Frequenz des Ultraschalls zwischen etwa 15 kHz und etwa 40 kHz, insbesondere zwischen etwa 20 kHz und etwa 35 kHz;
• ein Anpressdruck des inneren Profilteils gegen das äußere Profilteil während des Einleitens von Ultraschall zwischen etwa 0,5 bar und etwa 5 bar, insbesondere zwischen etwa 1 bar und etwa 4 bar; und
• eine Dauer des Einleitens von Ultraschall in das innere Profilteil zwischen etwa 0,1 s und etwa 3 s, insbesondere zwischen etwa 0,15 s und etwa 2,5 s.

Finally, it has proved to be advantageous if, in the process according to the invention, at least one, several or in particular also all of the following process parameters are set:

• a frequency of the ultrasound between about 15 kHz and about 40 kHz, in particular between about 20 kHz and about 35 kHz;
• a contact pressure of the inner profile part against the outer profile part during the introduction of ultrasound between about 0.5 bar and about 5 bar, in particular between about 1 bar and about 4 bar; and
• a duration of the introduction of ultrasound into the inner profile part between about 0.1 s and about 3 s, in particular between about 0.15 s and about 2.5 s.

Fig. 1

eine schematische Ansicht einer Vorrichtung zur zur Durchführung eines Verfahrens zur Herstellung einer mit einem Kantenschutz versehenen Platte mittels Ultraschallschweißen mit einer Ausführungsform einer soeben fertiggestellten Platte im Teilschnitt;

Fig. 2

eine schematische Detailansicht der aus einer Kernplatte, einem Außenrahmen in Form eines äußeren Profilteils und einem Innenrahmen in Form eines inneren Profilteils gebildeten Platte gemäß Fig. 1 unmittelbar vor Beginn des Ultraschallschweißvorgangs im Teilschnitt;

Fig. 3

eine der Fig. 2 entsprechende Detailansicht nur der Platte unmittelbar vor Beginn des Ultraschweißvorgangs;

Fig. 3a

eine Detailansicht der vorgesehenen Schweißstelle zwischen dem zentralen Abschnitt des inneren Profilteils und dem ersten Schenkel des äußeren Profilteils des Innen- bzw. Außenrahmens im Stadium der Fig. 3;

Fig. 3b

eine Detailansicht der vorgesehenen Schweißstelle zwischen den zweiten Schenkeln des inneren und äußeren Profilteils des Innen- bzw. Außenrahmens im Stadium der Fig. 3;

Fig. 4

eine der Fig. 3 entsprechende Detailansicht nur der Platte während des Ultraschallschweißvorgangs zu einem Stadium, an welchem der zentrale Abschnitt des inneren Profilteils bereits zumindest teilweise mit dem ersten Schenkel des äußeren Profilteils verschweißt worden ist;

Fig. 4a

eine Detailansicht der Schweißstelle zwischen dem zentralen Abschnitt des inneren Profilteils und dem ersten Schenkel des äußeren Profilteils des Innen- bzw. Außenrahmens im Stadium der Fig. 4;

Fig. 4b

eine Detailansicht der vorgesehenen Schweißstelle zwischen den zweiten Schenkeln des inneren und äußeren Profilteils des Innen- bzw. Außenrahmens im Stadium der Fig. 4; und

Fig. 5

eine der Fig. 3 und 4 entsprechende Detailansicht der Platte mit den fertig ultraschallverschweißten Profilteilen des Außen- und Innenrahmens.

Further features and advantages of the invention will become apparent from the following description of an embodiment with reference to the drawings. Showing:

Fig. 1

a schematic view of an apparatus for performing a method for producing a provided with an edge protection plate by ultrasonic welding with an embodiment of a just completed plate in partial section;

Fig. 2

a schematic detail of the formed of a core plate, an outer frame in the form of an outer profile part and an inner frame in the form of an inner profile part plate according to Fig. 1 immediately before the beginning of the ultrasonic welding process in partial section;

Fig. 3

one of the Fig. 2 corresponding detail view of only the plate immediately before the start of the ultrasonic welding process;

Fig. 3a

a detailed view of the intended weld between the central portion of the inner profile part and the first leg of the outer profile part of the inner and outer frame at the stage of Fig. 3 ;

Fig. 3b

a detailed view of the intended weld between the second legs of the inner and outer profile part of the inner and outer frame at the stage of Fig. 3 ;

Fig. 4

one of the Fig. 3 corresponding detail view only of the plate during the ultrasonic welding process to a stage at which the central portion of the inner profile part has already been at least partially welded to the first leg of the outer profile part;

Fig. 4a

a detailed view of the weld between the central portion of the inner profile part and the first leg of the outer profile part of the inner and outer frame at the stage of Fig. 4 ;

Fig. 4b

a detailed view of the intended weld between the second legs of the inner and outer profile part of the inner and outer frame at the stage of Fig. 4 ; and

Fig. 5

one of the 3 and 4 corresponding detail view of the plate with the finished ultrasonically welded profile parts of the outer and inner frame.

In the Fig. 1 schematically reproduced plate comprises a core plate 1 with a top 1a, a bottom 1b and side cut surfaces 1c, wherein the core plate 1, for example, from an open-porous and at least use side with a liquid-tight coating (not shown), eg melamine resin or the like, provided wood material, eg pressboard or the like, but also for example, from other materials, such as glass, plastic, metal, such as aluminum, etc., may be formed.

An edge protector covering the cut surfaces 1c of the core plate 1 comprises an outer frame, generally designated by reference numeral 100, and an inner frame, generally designated by reference numeral 200, both of a plasticizable plastic material, such as polypropylene (PP), polymethyl methacrylate (PMMA), acrylonitrile butadiene Styrene copolymers (ABS), acrylic ester-styrene-acrylonitrile copolymers (ASA), polystyrene (PS), polycarbonates (PC), polyamides (PA) or the like, and in particular may be in the form of injection-molded parts.

The outer frame 100 is formed by an outer profile part 101, which has an L-profile, the two legs 102, 103 are arranged in the present embodiment at an approximately right angle, wherein between the legs 102, 103, a radius is arranged, by means of which they merge. The first leg 102 of the outer profile part 101 engages over the upper side 1a of the core plate 1 and is arranged for this purpose in particular approximately parallel. The second leg 103 of the outer profile part 101 extends in the present case approximately parallel to the cut surface 1c of the core plate 1 from the first leg 102 and is longer in contrast to the Bottom 1b of the core plate 1 down (in Fig. 1 to tower above).

The inner frame 200 is formed by an inner profile part 201, which in the present case has an approximately parallel to the cut surface 1c of the core plate 1 and rectilinearly extending central portion 202, which in the assembled state of the Fig. 1 between the cut surface 1c of the core plate 1 and the second leg 103 of the outer profile part 101 is arranged. The core plate 1 is dimensioned such that between its cut surfaces 1 c and the central portion 202 of the inner profile part 201, a gap 2 remains to allow the core plate 1 in particular heat-related dimensional changes relative to the inner 200 and the hereby welded outer frame 100. The inner profile part 201 also has a first leg 203 which extends from its central section 202, in this case approximately at right angles, to the underside 1b of the core plate 1, which in turn is approximately parallel to the extension direction of the core plate 1 and consequently also to the first Leg 102 of the outer profile part 101 is arranged so that the first leg 102, 203 of the outer 101 and inner profile part 201, the core plate 1 edge receive between them. The inner profile part 201 also has a second leg 204 extending from its central portion 202 in the opposite direction, that is to say in the direction of the second leg 103 of the outer profile part 101, the free end of which (in FIG Fig. 1 left) end is welded to the inside of the second leg 103 of the external profite part 101. Furthermore, the free (in Fig. 1 bottom) end of the central portion 202 of the inner profile part 201 with the inside the first leg 102 of the outer profile part 101 welded.

As in particular from the Fig. 2 can be seen, which shows the same plate, but before the connection of outer frame 100 and inner frame 200 of the edge protector by means of ultrasonic welding, the second leg 103 of the outer profile part 101 on its inner side near its free (in Fig. 2 upper) end an inwardly projecting projection 104, which comprises an end face 105 which has a perpendicular to the second leg 103 of the outer profile part 101 - or parallel to the first leg 103 of the outer profile part 101 - arranged extension direction component and, for example, more or less exactly perpendicular to the second leg 103 of the outer profile part 101 may extend, in the present case, however, obliquely, for example, at an angle of about 30 ° to about 60 °, is arranged. The distance d between this projection 104 and the first leg 102 of the outer profile part 101 - or more precisely: between the end face 105 of the projection 104 and the inside connection point of the first leg 102 of the outer profile part 101 with the central portion 202 of the inner profile part 201 - is such that it is at least slightly, for example by about 1.5 mm, smaller than the distance D between the free end of the central portion 202 of the inner profile part 201 and the inside of the free end of the second leg 204, which in the mounted state of the Edge protection ( Fig. 1 ) is welded to the second leg 103 of the outer profile part 101 at the projection 104.

Again Fig. 2 can also be seen, the thickness of the core plate 1, so the distance between its top 1a from its bottom 1b, such that the plate thickness is smaller than the distance A between the facing inner side of the first legs 102, 203 of the outer 101 and inner profile part 201, if the inner profile part 201 more or less loose contact of its central portion 202 - or more precisely its substantially pointed free end - has been placed on the inside of the first leg 102 of the outer profile part 101, so before the ultrasonic welding process has been initiated (corresponding to the in Fig. 2 reproduced situation). The thickness of the core plate 1 is selected in the present embodiment by a measure smaller than the distance A between the facing inner sides of the first leg 102, 203 of the outer 101 and inner profile part 201, said measure is at least slightly greater than the difference of the distances D, d, on the one hand between the free end of the central portion 202 and the free end of the central portion 202 facing inside of the free end of the second leg 204 of the inner profile part 201, on the other hand between the projection 204 and the projection 204 facing inside of the first More precisely, this measure is so large as to substantially compensate for the welding dimensions of both junctions of the outer profile part 101 with the inner profile part 201, so that the facing inner sides of the first leg 102, 203 of the outer 101 and inner Profile section 201 at the A outside 1a or on the inside 1b of the core plate 1 come to rest when the welding process is completed with partial melting of the polymer material at the connection points (see Fig. 1 as well as in particular Fig. 5 below).

As further among other things from the Fig. 2 is apparent that is intended to form a welded joint Contact area of the inside of the first leg 102 of the outer profile part 101 with the free, eg pointed end of the central portion 202 of the inner profile part 201 in the direction of the free end of the first leg 102 of the outer profile part (in Fig. 1 to the right) is limited by an inwardly projecting nose 106 to prevent sliding of the central portion 202 of the inner profile part 201 along the first leg 102 of the outer profile part 201 during the ultrasonic welding operation. If necessary, for the same purpose, it may of course be alternatively or additionally provided that the contact area provided on the inside of the first leg 102 of the outer profile part 101 with the free end of the central portion 202 of the inner profile part 201 in the direction of the second leg 103 of FIG outer profile part (in Fig. 1 to the left) by a corresponding inwardly projecting nose (not shown). The nose (s) may either extend fully around the outer frame or may be provided in a plurality of circumferentially spaced lugs.

In addition, the inner profile part 201 in the present embodiment between a central portion 202 and its second leg 204 has an approximately L-shaped recess 205, which is configured, for example, substantially rectangular and their outer surface for conditioning only in Fig. 2 indicated sonotrode 3 is used to initiate the occasion of the ultrasonic welding process in the inner profile part 201 ultrasound. It makes the L-shaped recess 205, the ultrasonic energy as close as possible to the discharge point remote, free end of the central portion 202 of the inner To initiate profile part 201 in this, in order to ensure there a perfect weld.

Finally is Fig. 1 as well as in particular the Fig. 5 can be seen that in the illustrated embodiment, both the first leg 102 of the outer profile part 101 and the first leg 203 of the inner profile part 201 has a terminal, in the direction of the core plate 1 above and consequently facing each projection 107, 207, which finished mounted or welded state of the plate (see Fig. 5 For example, on the top 1a and on the bottom 1b of the core plate 1 comes to rest and the inside thereof each receives a seal 108, 208, which seals the core plate 1 against the edge protection formed from outer 101 and inner profile part. The thickness of the seals 108, 208 is preferably greater than the height of the respective projection 107, 207 in order to sufficiently compress the elastic sealing material in order to fulfill its sealing function.

Hereinafter, the method for producing the above-described, the outer frame 100 in the form of the outer profile part 101 and the inner frame 200 in the form of the inner profile part 201 comprehensive edge protection plate provided by ultrasonic welding of the two frames 100, 200, including the core plate 1 is explained in more detail ,

Mostly Fig. 1 can be seen, the outer profile portion 101 of the outer frame 100 of the edge protection is initially placed overhead on a suitable support 10 of the ultrasonic welding device. Then, the core plate 1, which previously - for example by spraying a still liquid-viscous, to a permanently elastic polymer material hardening resin mixture - with the two Seals 108, 208 has been provided, inserted into the outer profile part 101 by the core plate 1, for example, under engagement between the second leg 103 of the outer profile part 101 placed on a clamping table 11 of the ultrasonic welding device and fixed there by clamping. This can be done for example by means acting against the clamping table 11, height-displaceable in the direction of the arrows P ₁ hold-down 12. The clamping table 11 preferably has an approximately the thickness of the second leg 103 of the outer profile part 101 corresponding height difference with respect to the support 10 to uncontrolled introduction of ultrasound into the core plate 1 and a consequent swinging the same during the ultrasonic welding process as far as possible to prevent. Now, the inner profile part 201 is placed on the provided with the core plate 1 outer profile part 101, so that the free end of the central portion 202 of the inner profile part 201 rests on the inside of the first leg 102 of the outer profile part 101 inside the nose 106, while due the excess of the distance D with respect to the distance d, the free end of the second leg 204 of the inner profile part 201 with gap formation at a distance from the projection 104 on the inside of the second leg 103 of the outer profile part 101 is arranged. Due to the comparison with the distance A smaller thickness of the core plate 1, the first leg 203 of the inner profile part 201 is further arranged at a distance from the core plate 1. For lateral fixation of the outer frame 100 relative to the inner frame 200 whose profile parts 101, 201 can now be pressed against each other parallel to the extension direction of the core plate 1, which, for example by means of movable jaws 13, 14 according to Fig. 1 can happen. It follows, therefore, in the Fig. 3, 3a and 3b shown Situation before using the in Fig. 2 shown sonotrode 3 is introduced into the inner profile part 201 ultrasound.

Like now off Fig. 2 can be seen during the ultrasonic welding process, the inner profile part 201 with ultrasound, for example at a frequency of about 25 kH to 30 kH, excited by the sonotrode 3 under pressure, for example at about 2 bar to about 3 bar, from the outside (in Fig. 2 from above) against the L-shaped recess 205 and optionally also against the outside of the outside of the recess 205 arranged end portion of the second leg 204 of the inner profile part 201 - substantially perpendicular to the extension direction of the core plate 1 - is pressed, so that the ultrasonic energy approximately in Extension direction of the central portion 202 of the inner profile part 201 is introduced in the latter. In this, in total, for example, over a period of about 0.5 s to about 2 s maintained vibrational excitation by means of the sonotrode 3 - or more precisely: a plurality of distributed around the circumference of the inner profile part 201 arranged sonotrodes 3 (not shown in the drawing) - is first welded to the first leg 102 of the outer profile part 101, the sonotrode (s) 3 distant, free end of the central portion 202 of the inner profile part 101 welded to the outer profile part 101 by the free end of the central portion 202 due to the vibration excitation of the inner profile part 201 as well as due to vibration transmission there, the contact area of the inner side of the first leg 102 of the outer profile part 101 is plasticized or melts and merge said components at the connection point to form a perfect, firm weld there.

As a result of the pressure of the inner profile part 201 against the outer profile part 101 by means of the Sonotrode (s) 3 and due to increasing melting of the polymer material, in particular in the end region of the central portion 202 of the inner profile part 201, the inner profile part 201 is increasingly downward in the direction of outer profile part 101 moves until the free end of the second leg 204 with the projection 104 on the inside of the second leg 103 of the outer profile part 101 comes into contact. Consequently, during the ultrasonic welding process, a situation arises as shown in FIGS Fig. 4, 4a and 4b is reproduced, in particular from the Fig. 4a (as well as from the Fig. 3a ) is also apparent that the inside of the free end of the second leg 204 of the inner profile part 201 is preferably provided with a slope which the slope of the second leg 204 of the inner profile part 201 facing end 105 of the projection 104 of the second leg 103 of the outer Profile part 101 corresponds to provide a flat weld. In this situation (contact of the second leg 204 of the inner profile part 201 with the projection 104 of the outer profile part 101) is as shown Fig. 4 shows, the first leg 203 of the inner profile part 201 still under a - albeit admittedly smaller - distance from the bottom 1b of the core plate 1 away, so that a transfer of ultrasound into the core plate 1 by means of - in 3 and 4 not reproduced again graphically - Sonotrode (s) 3 (still) largely avoided.

Consequently, the sonotrode (s) 3 is now formed close weld between the second leg 204 of the inner profile part 201 and the second leg 103 of the outer profile part 101 at its inner projection 104, wherein here also due to fusing or melting of the polymer materials together, the outer profile part 201 under the pressure of the sonotrode (s) 3 in the direction of the outer profile part 101 is moved towards this further. At the end of the ultrasonic welding process, the in Fig. 5 (as well as in Fig. 1 ), in which the seals 108, 208 located between the first legs 102, 203 of the outer 101 and inner profile part 101 and the core plate 1 have been sufficiently compressed to fulfill the sealing function intended for them, and furthermore in particular the terminal projections 107, 207 of the first legs 102, 203 come into contact with the upper side 1a and with the lower side 1b of the core plate 1, respectively. The (also in Fig. 5 sonotrode (s) 3 that are not reproduced by drawing again are now brought out of contact with inner profile part 201, for example by being lifted. The ultrasonic welded connections produced are characterized in particular by the fact that not only the point of introduction of the ultrasound near the connection point between the second legs 103, 204 of the profile parts 101, 201, but in particular also the point of introduction of the ultrasound remote connection point between the first legs 102, 203 of Profile parts 101, 201 are formed permanently durable and dense, with a committee is avoided due to only partially inadequate welded joints.

Claims (15)

1. Method for manufacturing a panel that is provided with an edge protection, in particular in the form of a table leaf or a cover panel, comprising:

   - a core panel (1) having an upper side (1a), a lower side (1b), and lateral cut faces (1c);

   - an external profile part (101), forming an external frame (100) of the edge protection, from a plastics material capable of plastification, wherein the external profile part (101) has an L-shaped profile having a first leg (102), engaging across the upper side (1a) of the core panel (1), and a second leg (103), extending so as to be substantially parallel with the cut face (1c) of the core panel (1); and

   - an internal profile part (201), forming an internal frame (200) of the edge protection, from a plastics material capable of plastification, wherein the internal profile part (201) has a central portion (202) that extends so as to be substantially parallel with the cut face (1c) of the core panel (1), or with the second leg (103) of the external profile part (101), respectively, and is disposed between the second leg (103) of the external profile part (101) and the cut face (1c) of the core panel (1), a first leg (203) that extends away from the central portion (202) and engages the core panel (1) across the lower side (1b) of the latter, and a second leg (204) that extends away from the central portion (202) in the opposite direction;

   - wherein the first leg (102) of the external profile part (101), and the first leg (203) of the internal profile part (201) therebetween receive the peripheral region of the core panel (1), and the free end of the central portion (202) of the internal profile part (201) is welded to the first leg (102) of the external profile part (101), on the one hand, and the free end of the second leg (204) of the internal profile part (201) is welded to the second leg (103) of the external profile part (101), on the other hand,

   in that the core panel (1) is placed in the external profile part (101), the internal profile part (201) is placed on top of the core panel (1) and the external profile part (101), and ultrasound is induced into the internal profile part (201) so as to weld the free end of the central portion (202) of the internal profile part (201) to the first leg (102) of the external profile part (101), and the free end of the second leg (204) of the internal profile part (201) to the second leg (103) of the external profile part (101), the method being characterized by the following method steps:

   - providing an external profile part (101), the second leg (103) of which on the internal side thereof has a protrusion (104) which has at least one end side (105) having a component of the direction of extent that is disposed perpendicularly to the second leg (103) of the external profile part (101);

   - providing an internal profile part (201) in the case of which the spacing (D) between the free end of the central portion (202) thereof and that internal side of the free end of the second leg (204) thereof that faces the free end of the central portion (202) thereof is larger than the spacing (d) between the protrusion (104) and that internal side of the first leg (102) of the external profile part (101) that faces the protrusion (104);

   - placing the core panel (1) in the external profile part (101), and placing the internal profile part (201) onto the core panel (1) and the external profile part (101) until the free end of the central portion (202) of the internal profile part (201) contacts the first leg (102) of the external profile part (101) and a gap remains between the free end of the second leg (204) of the internal profile part (201) and the protrusion (104) that is disposed on the second leg (103) of the external profile part (101);

   - inducing ultrasound into the internal profile part (101) at that side thereof that faces away from the free end of the central portion (202) of said internal profile part (101), and pressing the internal profile part (201) against the external profile part (101) in a manner substantially perpendicular to the direction of extent of the core panel (1), wherein

   initially the free end of the central portion (202) of the internal profile part (201) is welded to the first leg (102) of the external profile part (101), and thereafter, as the plastification of the free end of the central portion (202) of the internal profile part (201) progresses, the free end of the second leg (204) of the internal profile part (201) contacts the protrusion (104) of the second leg (103) of the external profile part (101) and is likewise welded thereto.
2. Method according to Claim 1, characterized in that the external profile part (101) and the internal profile part (201), at least during the induction of ultrasound into the internal profile part (101), are mutually compressed substantially in the direction of extent of the core panel (1).
3. Method according to Claim 1 or 2, characterized in that the thickness of the core panel (1) is chosen in such a manner that said thickness is smaller than the spacing (A) between the mutually facing internal sides of the first legs (102, 203) of the external (101) and the internal profile part (201), if and when the internal profile part (201), as contact between the central portion (202) thereof and the first leg (102) of the external profile part (101) takes place, has been placed onto the external profile part (101).
4. Method according to Claim 3, characterized in that the thickness of the core panel (1) is chosen so as to be smaller by a margin than the spacing (A) between the mutually facing internal sides of the first legs (102, 203) of the external (101) and the internal profile part (201), said margin corresponding to at least the difference between the spacings (D, d) between the free end of the central portion (202) and that internal side of the free end of the second leg (204) of the internal profile part (201) that faces the free end of the central portion (202), on the one hand, and between the protrusion (104) and that internal side of the first leg (102) of the external profile part (101) that faces the protrusion (104), on the other hand.
5. Method according to one of Claims 1 to 4, characterized in that the internal profile part (201) is placed on the core panel (1) in such a manner that a gap (2) remains between the central portion (202) of said internal profile part (201) and the cut face (1c) of the core panel (1).
6. Method according to one of Claims 1 to 5, characterized in that at least one seal (108, 208) is disposed between the first leg (102) of the external profile part (101) and the core panel (1), and/or between the first leg (203) of the internal profile part (201) and the core panel (1).
7. Method according to one of Claims 1 to 6, characterized in that the core panel (1) is fixed, in particular in a clamped manner, at least during the induction of ultrasound into the internal profile part (201).
8. Method according to one of Claims 1 to 7, characterized in that the ultrasound is induced into the internal profile part (201) substantially in the direction of extent of the central portion (202) thereof, wherein the ultrasound is induced in particular into a substantially L-shaped clearance (205) between the central portion (202) and the second leg (204) of the internal profile part (201).
9. Method according to one of Claims 1 to 8, characterized in that at least one of the following method parameters is set:

   - an ultrasonic frequency between 15 kHz and 40 kHz, in particular between 20 kHz and 35 kHz;

   - a contact pressure of the internal profile part (201) on the external profile part (101), during the induction of ultrasound, between 0.5 bar and 5 bar, in particular between 1 bar and 4 bar; and

   - a duration of the induction of ultrasound into the internal profile part (201) between 0.1 s and 3 s, in particular between 0.15 s and 2.5 s.
10. Frame assembly for manufacturing an edge protection of a core panel (1) according to a method according to one of Claims 1 to 9, comprising

    - an external profile part (101), forming an external frame (100) of the edge protection, from a plastics material capable of plastification, wherein the external profile part (101) has an L-shaped profile of which the first leg (102) is configured for engaging across the upper side (1a) of the core panel (1), and of which the second leg (103) is configured for disposal in a manner substantially parallel with the cut face (1c) of the core panel (1); and

    - an internal profile part (201), forming an internal frame (200) of the edged protection, from a plastics material capable of plastification, wherein the internal profile part (201) has a central portion (202) which is configured for disposal in a manner substantially parallel with the cut face (1c) of the core panel (1), or for disposal in a manner substantially parallel with the second leg (103) of the external profile part (101), between the second leg (103) of the external profile part (101) and the cut face (1c) of the core panel (1), and wherein the internal profile part (201) furthermore has a first leg (203) that extends away from the central portion (202) and that is configured for engaging across the lower side (1b) of the core panel (1), and a second leg (204) that extends away from the central portion (202) in the opposite direction;

    - wherein the first leg (102) of the external profile part (101), and the first leg (203) of the internal profile part (201) are configured for receiving therebetween the peripheral region of the core panel (1), and the free end of the central portion (202) of the internal profile part (201) is weldable to the first leg (102) of the external profile part (101), on the one hand, and the free end of the second leg (204) of the internal profile part (201) is weldable to the second leg (103) of the external profile part (101), on the other hand, if and when the core panel (1) has been placed in the external profile part (101), and the internal profile part (201) has been placed on the core panel (1) and the external profile part (101); and

    - wherein the second leg (103) of the external profile part (101) on the internal side thereof has a protrusion (104) which has at least one end side (105) having a component of the direction of extent that is disposed perpendicularly to the second leg (103) of the external profile part (101);

    characterized in that the spacing (D) between the free end of the central portion (202) and that internal side of the free end of the second leg (204) of the internal profile part (201) that faces the free end of the central portion (202) is larger than the spacing (d) between the protrusion (104) and that internal side of the first leg (102) of the external profile part (101) that faces the protrusion (104).
11. Frame assembly according to Claim 10, characterized in that the spacing (D) between the free end of the central portion (202) and that internal side of the free end of the second leg (204) of the internal profile part (201) that faces the free end of the central portion (202) is larger by 0.5 mm to 3 mm, in particular by 0.5 mm to 2 mm, than the spacing (d) between the protrusion (104) and that internal side of the first leg (102) of the external profile part (101) that faces the protrusion (104).
12. Frame assembly according to Claim 10 or 11, characterized in that the free end of the central portion (202) of the internal profile part (201) tapers off in a substantially pointed manner.
13. Frame assembly according to one of Claims 10 to 12, characterized in that the contact region of the internal side of the first leg (102) of the external profile part (101), which contacts the free end of the central portion (202) of the internal profile part (201) is delimited by an inwardly protruding cam (106) at least in the direction of the free end of the first leg (102) of the external profile part (101).
14. Frame assembly according to one of Claims 10 to 13, characterized in that the first leg (102) of the external profile part (101), and/or the first leg (203) of the internal profile part (201), have/has at least one in particular end-side protrusion (107, 207) that projects in the direction of the core panel (1).
15. Frame assembly according to one of Claims 10 to 14, characterized in that the internal profile part (201), between the central portion (202) thereof and the second leg (204) thereof, has a substantially L-shaped clearance (205).

Images