Bonding system for a two-component adhesive and method for operating such a bonding system

Abstract

Bonding system for a two-component adhesive (12), with a mixing device (14) for mixing a first adhesive component (16) and a second adhesive component (18) to form the two-component adhesive (12), which has an outlet line (20) for applying the two-component adhesive (12), a first inlet line (22) connected to the mixing device (14) for supplying the first adhesive component (16) and a second inlet line (24) connected to the mixing device (14) for supplying the second adhesive component (18), characterized in that the bonding system is designed such that it can carry out two different rinsing processes, namely a two-component rinsing process and a different rinsing process, wherein the bonding system is further designed such that, if the predetermined amount of two-component adhesive (12) is not applied via the outlet line (20) within a predetermined pot life, a two-component rinsing process or another rinsing process different from the two-component rinsing process is selected and carried out depending on at least one predetermined parameter, wherein the at least one predetermined parameter for selecting the rinsing process comprises the application pause duration that occurs when applying the two-component adhesive (12), and that a first and a separate second rinsing container (26, 28) are provided, wherein the bonding system is designed such that only two-component adhesive (12) is supplied to the first rinsing container (26) and the second rinsing container (28) is provided for receiving individual adhesive components (16, 18) and / or a rinsing fluid (29), and wherein the two-component adhesive (12) which has reached its pot life is rinsed out during the two-component rinsing process.

Description

The invention relates to an adhesive system for a two-component adhesive, having a mixing device for mixing a first adhesive component and a second adhesive component to form a two-component adhesive, which has an output line for applying the two-component adhesive, a first input line, connected to the mixing device, for supplying the first adhesive component, and a second input line, connected to the mixing device, for supplying the second adhesive component. Furthermore, the invention also relates to a method for operating such an adhesive bonding system.The connection of components by a two-component adhesive is generally known from the prior art. In corresponding adhesive bonding systems, the two adhesive components are mixed and applied via an output line to at least one of the components to be connected.During operation of the adhesive system, the mixing device contains completely mixed two-component adhesive, which has not yet been applied, however. This two-component adhesive must be processed within a predetermined time, the so-called pot life of the two-component adhesive, before a marked increase in viscosity makes further processing more difficult or prevented. If the pot life is reached, for example, by pauses in application, the adhesive system carries out a so-called rinsing process in order to deposit the two-component adhesive located in the mixing device. The material separated during a flushing process is usually supplied to a flushing container and then disposed of. Since the separated material can still contain reactive substances, such as an unmixed adhesive component, depending on the type of rinsing process, the contents of the rinsing container must be disposed of as a waste in conventional adhesive plants.A device for the flat application of a two-component material to a carrier, which has all the features in the preamble of claim 1, is described in DE 11 2006 002 587 B4. The apparatus comprises at least one material tank for a first component, at least one material tank for a second component and conveying means which convey the material components to a mixer conveyor which produces a material mixture and delivers it to a slot die. The elongated slot die has an outlet slot extending from a first end to a second end of the slot die, with a mixer provided at each end such that the material mixture is supplied to the slot die at both ends and applied to a carrier via the outlet slot.DE 43 04 014 A1 describes a process for the continuous preparation of polymers, in particular polyacrylates of low molecular weight, and also possible uses of these polymers.DE 10 2004 062 456 A1 discloses phenol-containing aminoplast resins, a process for their production and their use as binders in the production of wood materials, in particular particle board.It is an object of the invention to provide an adhesive system for a two-component adhesive and a method for operating such an adhesive system, wherein the amount of waste produced during rinsing processes is significantly reduced.This object is achieved by an adhesive system according to claim 1, which has a first rinsing container exclusively for receiving two-component adhesive and a separate second rinsing container for receiving individual adhesive components and / or a rinsing fluid. The already mixed two-component adhesive no longer contains reactive material, cures in the first rinsing container and can subsequently be disposed of without problems as domestic waste. Only the material located in the second rinsing container can contain reactive substances such as, for example, an neat adhesive component and must therefore be supplied to the special waste. The simple provision of two separate rinsing containers in the adhesive bonding system thus enables a considerable reduction of the waste produced in the adhesive bonding system.The object is also achieved, moreover, by a method according to claim 2 for operating the abovementioned adhesive bonding plant, having the following method steps:the first adhesive component is supplied to the mixing device via the first inlet line and the second adhesive component is supplied via the second inlet line and mixed in the mixing device to form a predetermined quantity of two-component adhesive;If the predetermined amount of two-component adhesive is not applied via the output line within a predetermined pot life, then depending on at least one predetermined parameter a two-component rinsing process, in which the pot life of two-component adhesive reached is rinsed out, or another rinsing process different from the two-component rinsing process is selected and carried out, wherein, in the case of a selection of the two-component rinsing process, the rinsing process carried out in this rinsing process is performed.In the embodiment, the two-component adhesive separated from the output line is supplied to the first rinsing container, and the first rinsing container is filled with only two-component adhesive, and in the case of a selection of the other rinsing process different from the two-component rinsing process, a material separated from the output line in this rinsing process is supplied to the separate second rinsing container.By means of this method, each of the various flushing processes of the adhesive system is assigned a special flushing container to which the material separated during the respective flushing process is supplied. This simple assignment between the type of flushing process and the respective flushing container can be implemented quickly and easily in a control of the gluing system, so that the quantity of waste waste accumulating during operation of the gluing system can be significantly reduced with little effort.If an application pause occurs during the application of the two-component adhesive, the at least one parameter for selecting the rinsing process comprises application pause duration. In the case of short interruptions in the working or application pauses, a two-component rinsing process is carried out in order to keep the adhesive system ready for operation for further adhesive applications. If, on the other hand, longer application pauses are foreseeable, then as a rule another rinsing process is carried out, in which the adhesive bonding system is set into a resting state. This idle state is characterized in that no two-component adhesive mixed from the two adhesive components is present in the mixing device, so that no pot life has to be observed and consequently even longer work interruptions can be realized without further rinsing operations.According to the method, the first adhesive component is supplied to the mixing device in the two-component flushing process via the first inlet line and the second adhesive component is supplied via the second inlet line and mixed in the mixing device to form a predetermined amount of two-component adhesive, while the two-component adhesive present in the mixing device is separated via the outlet line and supplied to the first flushing container. Consequently, during the two-component flushing process, only two-component adhesive is separated off via the outlet line, which cures in the first flushing container and can subsequently be disposed of via the domestic waste without problems and inexpensively.According to the method, at most one of the adhesive components and / or a rinsing fluid different from the adhesive components is supplied to the mixing device in the other rinsing process different from the two-component rinsing process via the inlet lines and subsequently separated via the outlet line and supplied to the second rinsing container. The material located in the second rinsing container can therefore contain, in addition to non-reactive substances such as already completely mixed two-component adhesive, also reactive substances such as individual non-mixed adhesive components, for example, and consequently must be supplied to the waste.Further features and advantages of the invention will become apparent from the following description of a preferred embodiment with reference to the drawings. In this figure, the single figure shows a schematic diagram of an inventive adhesive bonding plant which is operated by an inventive method.The figure shows an adhesive system 10 for a two-component adhesive 12, having a mixing device 14 for mixing a first adhesive component 16 and a second adhesive component 18 to form the two-component adhesive 12, a first inlet line 22 connected to the mixing device 14 for supplying the first adhesive component 16, a second inlet line 24 connected to the mixing device 14 for supplying the second adhesive component 18, a first rinse container 26 exclusively for receiving two-component adhesive 12 and a separate second rinse container 28 for receiving individual adhesive components 16, 18 and / or a rinse fluid 29.The mixing device 14 for mixing the two adhesive components 16, 18 can be a static mixing device or a dynamic mixing device, wherein dynamic mixing devices have proven to be particularly advantageous for industrial use.The mixing device 14 comprises an output line 20 for applying the two-component adhesive 12 to a component 32 to be bonded, wherein the output line 20 has an application nozzle 30 in particular at one line end.Since only mixed, no longer reactive two-component adhesive 12 is accommodated in the first rinsing container 26, the material located in the first rinsing container 26 can be supplied to the domestic waste without problems after curing. Thus, the first wash tub 26 is a domestic waste tub.In contrast, the second rinse container 28 also accommodates reactive substances, such as the ready-mixed two-component adhesive 12, in addition to non-reactive substances, such as the unmixed first adhesive component 16 or the unmixed second adhesive component 18, so that the material located in the second rinse container 28 must be supplied corresponding to the special waste. Consequently, the second wash container 28 is a special waste container.A method for operating the above-mentioned adhesive system 10 for the two-component adhesive 12 is described below, wherein the method comprises the following steps:the first adhesive component 16 is supplied to the mixing device 14 via the first inlet line 22 and the second adhesive component 18 is supplied via the second inlet line 24 and mixed in the mixing device 14 to form a predetermined amount of two-component adhesive 12.If the predetermined amount of two-component adhesive 12 is not applied via the output line 20I to the component 32 to be bonded within a pot life predetermined for the respective two-component adhesive 12, then a two-component rinsing process, in which the pot life of two-component adhesive achieved is rinsed out, or another, different rinsing process is selected and carried out from different rinsing processes of the bonding system 10 depending on predeterminable parameters. In this case, the two-component adhesive 12 separated off via the outlet line 20 in the two-component flushing process is fed to the first flushing container 26 and a material separated off via the outlet line 20 in the other flushing process is fed to the separate second flushing container 28. The first rinsing container is filled exclusively with two-component adhesive.Specifically, during the two-component rinsing process, the first adhesive component 1 16 is supplied to the mixing device 14 via the first inlet line 22 and the second adhesive component 18 is supplied via the second inlet line 24 and mixed in the mixing device 14 to form a predetermined amount of two-component adhesive 12, while the two-component adhesive 12 present in the mixing device 14 and reaching the pot life I is separated via the outlet line 20 and supplied to the first 1 rinse container 26.During the two-component rinsing process, therefore, only "older" two-component adhesive 12, which is already located in the mixing device for approximately the predefined pot life, is replaced by "freshly mixed" two-component adhesive 12, so that the adhesive system 10 remains ready for use. If appropriate, after the pot life has ended (again), a further flushing operation must be carried out.During the other flushing operation, at most one of the adhesive components 16, 18 and / or the flushing fluid 29 different from the adhesive components 16, 18 is supplied to the mixing device 14 via the inlet lines 22, 24 and subsequently separated back into the second flushing container 28 via the outlet line 20."Other rinsing processes" include, for example, a one-component rinsing process in which only one of the adhesive components 16, 18 is supplied to the mixing device 14 via both inlet lines 22, 24. During such a flushing process, both non-reactive two-component adhesive 12 is deposited from the mixing device 14 and the supplied, neat and thus reactive adhesive component 16, 18 via the output line 20. The one-component flushing process takes so long until all of the two-component adhesive 12 is removed from the mixing device 14 and only the adhesive component 16 or 18 used for flushing is located in the mixing device 14. Since the respective other adhesive component 18, 16 is missing as reaction partner in the mixing device 14, the adhesive system 10 is in a so-called rest position. The adhesive system 10 can also remain in this idle state over very long application pauses, which exceed the predefined pot life in particular, without further rinsing processes being necessary.Before the renewed application of two-component adhesive 12, the first adhesive component 16 is supplied to the mixing device 14 again via the first inlet line 22 and the second adhesive component 18 via the second inlet line 24, and the (reactive) adhesive component 16 or 18 used for the one-component flushing process is displaced from the mixing device 14 and supplied via the outlet line 20 to the second flushing container 28.In addition to the one-component flushing process, the "other flushing processes" also include a flushing process in which a flushing fluid 29 different from the adhesive components 16, 18 is supplied to the mixing device 14 via both inlet lines 22, 24. Analogously to the one-component flushing process, the adhesive system 10 is thereby transferred into its idle state, wherein both a reactive material and a non-reactive material can be used as flushing fluid 29.If an application pause of the two-component adhesive 12 reaches the predefined pot life, a suitable parameter for selecting the rinsing process is, for example, an anticipated application pause duration. In order to avoid waste and to reduce the rinsing losses, a two-component rinsing process is carried out, for example, in the case of rather short application pauses and another rinsing process is carried out in the case of rather long application pauses.By providing two separate wash containers 26, 28 and simply assigning the first wash container 26 to the two-component rinsing process and the second wash container 28 to the other rinsing process, particularly little waste arises in the adhesive system 10. Consequently, disposal costs can be saved and environmental loads can be reduced with little effort during operation of the adhesive bonding plant 10.

Claims

Adhesive system for a two-component adhesive (12), having a mixing device (14) for mixing a first adhesive component (16) and a second adhesive component (18) to form the two-component adhesive (12), which has an output line (20) for applying the two-component adhesive (12), a first input line (22), connected to the mixing device (14), for supplying the first adhesive component (16), and a second input line (24), connected to the mixing device (14), for supplying the second adhesive component (18), characterized in that the adhesive system is designed such that the two different flushing operations can be carried out, namely a two-component flushing operation and a flushing operation different therefrom, wherein the adhesive system is furthermore designed such that, if the predetermined amount of two-component adhesive (12) is not applied via the output line (20) within a predetermined pot life, a two-component flushing operation or another, depending on at least one predetermined parameter, is carried out, The two-component rinsing process can be selected and carried out in a different rinsing process from the two-component rinsing process, wherein the at least one predetermined parameter for selecting the rinsing process comprises the application pause duration which occurs during the application of the two-component adhesive (12), and that a first and a separate second rinsing container (26, 28) are provided, wherein the adhesive system is designed such that only two-component adhesive (12) is supplied to the first rinsing container (26) and the second rinsing container (28) is provided for receiving individual adhesive components (16, 18) and / or a rinsing fluid (29), and wherein the two-component adhesive (12) which reaches the pot life is rinsed out during the two-component rinsing process.Method for operating an adhesive system (10) for a two-component adhesive (12) according to Claim 1, characterized bythe following method steps: - the first adhesive component (16) is fed to the mixing device (14) via the first inlet line (22) and the second adhesive component (18) is fed via the second inlet line (24), and is mixed in the mixing device (14) to form a predetermined amount of two-component adhesive (12); If the predetermined amount of two-component adhesive (12) is not applied over the output line (20) within a predetermined pot life, a two-component rinsing process or another rinsing process different from the two-component rinsing process is selected and carried out depending on at least one predetermined parameter, wherein in the case of a selection of the two-component rinsing process the two-component adhesive (12) separated in this rinsing process over the output line (20) is supplied to the first rinsing container (26), and the first rinsing container (26) is filled exclusively with two-component adhesive (12), wherein in the case of a selection of the other rinsing process different from the two-component rinsing process a material separated in this rinsing process over the output line (20) is supplied to the separate second rinsing container (26), and wherein during the application of the two-component adhesive (12) an application pause occurs and the at least one predetermined parameter for selecting the rinsing process comprises the application pause duration.Method according to claim 2, characterised in that during the two-component rinsing process, the first adhesive component (16) is supplied to the mixing device (14) via the first inlet line (22) and the second adhesive component (18) is supplied via the second inlet line (24) and mixed in the mixing device (14) to form a predetermined quantity of two-component adhesive (12), while the two-component adhesive (12) present in the mixing device (14) is separated via the outlet line (20) and supplied to the first rinsing container (26).Method according to claim 2 or 3, characterised in that at most one of the adhesive components (16, 18) and / or a rinsing fluid (29) different from the adhesive components (16, 18) is supplied to the mixing device (14) in the other rinsing process different from the two-component rinsing process via the inlet lines (22, 24) and subsequently separated via the outlet line (20) and supplied to the second rinsing container (28).

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