DE102009025065A1 - Method for temporary conservation of a pre-treated surface of a workpiece, comprises pre-treating an area of workpiece surface for a planned treatment, and partially subjecting the pre-treated area to the planned treatment - Google Patents

Abstract

The method comprises pre-treating an area (4) of workpiece surface (2) for a planned treatment, and partially subjecting the pre-treated area of the workpiece surface to the planned treatment. An area is covered and shielded after the pre-treatment with a film. The film is removed before carrying out the planned treatment. The pre-treated area is covered or shielded in section-wise manner. The area of the workpiece surface is pre-treated with an atmospheric plasma beam, with a low pressure plasma treatment, with flame or with corona discharge. The method comprises pre-treating an area (4) of workpiece surface (2) for a planned treatment, and partially subjecting the pre-treated area of the workpiece surface to the planned treatment. An area is covered and shielded after the pre-treatment with a film. The film is removed before carrying out the planned treatment. The pre-treated area is covered or shielded in section-wise manner. The area of the workpiece surface is pre-treated with an atmospheric plasma beam, with a low pressure plasma treatment, with flame or with corona discharge or the film is pre-treated before covering and shielding on the side turned to the area of the workpiece surface, with atmospheric plasma beam (6), with low pressure plasma treatment, with flame or with corona discharge. The planned treatment comprises adhering, printing and/or coating. The film is functionalized on the side turned to the area of the workpiece surface by a primer and/or a bonding agent, has a silicon component, and comprises a release layer. A layer remains on the area of the workpiece during removing the film. The film comprises a water- and/or oxygen barrier layer and is metallized. The film is provided before covering and shielding as tape. An independent claim is included for a film for temporary conservation of a pre-treated surface of a workpiece.

Description

The The invention relates to a method for temporary preservation a pretreated surface, wherein at least one Area of a workpiece surface for is pretreated a planned step and in which the pretreated area of the workpiece surface is fully or partially subjected to the planned work step. The invention also relates to a film for temporary preservation a pretreated surface with a carrier layer and with a second layer, as well as an advantageous use a slide.

at the manufacture or machining of workpieces Frequently performed work steps that one Pretreatment of an area of the workpiece surface require. The pretreatment becomes the planned work step then, for example, simplified, improved or even for the first time allows.

Examples For such operations are the coating and painting of workpiece surfaces or gluing of Workpieces. Before carrying out the work steps It is advantageous to work through the workpiece surface to clean a pretreatment and / or by a change the surface structure of their wettability to increase.

So is out of the EP 0 761 415 It is known that the adhesion between a workpiece surface and a coating can be improved by pretreating the workpiece surface with an atmospheric plasma jet. By subjecting the workpiece surface with the plasma jet, this is cleaned on the one hand, on the other hand, the surface can be activated and thus the surface tension can be increased, so that the coating can be applied more easily to the workpiece surface and also better adheres to the workpiece surface.

It are from the prior art but also many other methods known to be a workpiece surface for to pretreat a work step. So can the workpiece surface for example, by a low-pressure plasma treatment, a Flame, an electrical discharge or pretreated in some other way become.

To Termination of the pretreatment is subject to the pretreated workpiece surface usually further changes. So can the workpiece surface especially re-pollute or those in the surface activated molecules can recombine again, so that the improved properties achieved by the pretreatment of the Degenerate surface again, that is, deteriorate. For this reason, it is necessary to do the pretreatment in spatial and temporal proximity to the planned work step.

A Pretreatment of the workpiece surface requires however, regularly the use of special devices. For example, for a low-pressure plasma treatment, one corresponding low-pressure chamber with a plasma system required.

These must then be near the place where the planned work step should be available. In particular, the pretreatment must be essentially immediate be made before the work step. A stock pretreatment of various Workpiece surfaces is due to the temporal Degeneration of the pretreated workpiece surface bad or not possible. That is why the implementation subcontracting for pre-treatment is virtually impossible.

The Keeping the device for pretreatment thus leads for a cost and effort increase during processing or manufacture of the workpiece. In particular, need also high investment costs for the device for pretreatment in To be taken.

Of the Invention is thus based on the technical problem of a method and a device, as well as a use of the device for To provide with the above listed Disadvantages of the prior art can be avoided.

These Task is in a generic method solved according to the invention that the at least one area after pretreatment with a film covered and protected and that the film before the Removal of the planned work step removed becomes.

It It has been recognized that a pretreated area of a workpiece surface by covering and protecting with a foil largely or completely preceded by degeneration, for example Pollution or recombination can be preserved. To this Way, it is possible to pre-treat the workpiece surface temporally and / or spatially independent of the Carrying out the planned work step.

In particular, workpieces can be pretreated in advance and covered with a film and protected and then be subjected to the planned operation with a time interval after removal of the film. The operation of the device for pretreatment must therefore not be maintained during the planned work step who the.

Farther In particular, it is possible to attach the workpieces pretreat a first place and cover with a foil and to protect the workpieces then to a second Place to transport and there after removing the film the planned To undergo a work step. For example, the two places can be to trade two different factories or industrial companies.

Of the pretreated area is in a preferred embodiment covered and protected in sections. Under a partial covering and shooting is particularly understood that the pretreated area is not complete, but only covered and protected in the sections which should be subjected to the planned work step. In this way, the workpiece, for example, a large area pretreated and then only in small sections The pretreated surface is covered and protected become. This can be saved on the one hand foil, on the other hand can use the slide as a position marker for the planned Work step to be used.

In A preferred embodiment of the method is the Area of the workpiece surface with an atmospheric Plasma jet, with a low pressure plasma treatment, with a flame or with an electrical discharge, in particular with a corona discharge pretreated. It has been shown that these types of pretreatment the workpiece surface particularly well on the Preparing a planned work step. Furthermore, have such pretreated workpiece surface a great sensitivity to degeneration processes so that covering and protecting with a foil the workpiece surface in particular saved from degeneration.

Of the planned operation comprises in a further preferred embodiment the process, a bond, a pressure and / or a coating. It has been shown that these steps are particularly good require pretreated workpiece surface, so that by covering and protecting the workpiece surface a significant improvement of these steps possible is. For example, an area of a workpiece surface pretreated for adhesion as well as covered and protected be, so that the workpiece after storage or a transport with another component in this area by the obtained effect of pretreatment can be better glued.

The Degeneration of the treated area is in a further embodiment of the method further reduced by the fact that the film before the Cover and shoot at least on the area of the Workpiece surface facing side, so on the front, with an atmospheric plasma jet, with a low-pressure plasma treatment, with a flame or with an electrical discharge, in particular with a corona discharge is pretreated. This will prevent the pretreated Area through the coming into contact with this side of the film degenerate.

The Foil consists in a further preferred embodiment of the method essentially of flexible plastics, preferably from polyolefins such as polyethylene (PE) or polypropylene (PP), from Polyisobutylene (PIB), soft polyvinyl chloride (PVC-P), polyamide (PA) or rubber, in particular modified with ethylene vinyl acetate Polyolefins, or paper. It has been shown that these materials good for covering and shooting and suitable They are also inexpensive.

In Another embodiment of the method is the film on the area of the workpiece surface facing Side functionalized by a coating, in particular by means of functionalized of a primer and / or an adhesion promoter. The Functionalization may, for example, be such that the chemical or physical properties obtained during the pretreatment the workpiece surface are largely retained. Thus, through a functionalization, with the polar groups in the pretreated area of the workpiece surface stay on the surface, the increased surface tension or wettability. The functionalization is preferred on the respective pretreatment process and its surface activation Voted.

at the functionalization of the film with a primer and / or adhesion promoter can cover and protect the surface targeted be subjected to a material. By providing a primer and / or adhesion promoter, can by the pretreatment improved adhesion of the workpiece surface be further improved. Alternatively, the primer and / or the Bonding agents also serve to better the film on the workpiece hold. Without primer and / or adhesion promoter, the film can Adhesion to be fixed to the workpiece.

A particularly good adhesion to the pretreated surface is modified with ethylene vinyl acetate modified films of polyolefins reached.

In a further preferred embodiment of the method, the film has on the side facing the region of the workpiece surface adhesion-friendly compounds, for example silanes. These compounds are used to functionalize workpiece surfaces, so that adhesion bridges are deposited on the workpiece surface in this way.

The Peeling off the film is made easier by the fact that the film on the area of the workpiece surface facing and / or side facing a release layer. Through a release layer on the side facing the area, the film can before performing the work step easier again from the workpiece be removed. This is particularly advantageous if the pretreated area has a high adhesion.

Farther By such a release layer, the film can be covered before covering and protecting the pretreated area from a carrier be replaced on the slide, for example, appropriate is provided. By the carrier can be pretreated with the Protected area in contact side of the film. Preferably, both the carrier and the corresponding side of the foil in one of the above ways pretreated. The carrier is preferred a plastic or paper foil.

By doing a release layer on the side facing away from the area, that is The back, provided, may be this side as a carrier a further film or the same film can be used.

In a further preferred embodiment of the method When removing the film, a layer remains on the area the workpiece surface. This way is simultaneous a cover and a protection as well as a coating of this area possible. The area can thus be used, for example, with a primer and / or adhesion promoter layer are coated. This is especially true at Aluminum materials advantageous.

On the workpiece surface may also be in the area a functionalized layer remain. This can be done with the film prefers a release layer between the functionalized layer and the remaining film can be provided.

The Degeneration of the pretreated area may be in another Embodiment of the method can be improved by that the film is a barrier layer, in particular a water and / or Having oxygen barrier layer. This will prevent that certain substances, in particular water, through the film to the pretreated area and can degenerate this.

The Covering and protecting the pretreated area can be further improved by the fact that the film is metallized. Through a metallization, the permeability of Foil for impurities, heat, cold or for others to increased degeneration leading influences significantly reduced. Farther The metalization allows greater strength and thus a higher durability of the film can be achieved.

In a further preferred embodiment of the method The film is provided as a tape before covering and shooters. In this way, the film can be stored in a simple manner and is available if needed. Furthermore, the Film itself subjected to pretreatment, made up as a tape and then to the location of the pre-treatment of the workpiece surface to be brought.

The Deploying as a tape will still allow the back to use the film as a carrier of the film. So will the Front side of a section of the film through the back protected the underlying winding of the film.

The technical problem continues according to the invention thereby solved in a generic film, that the second layer as a release layer, functionalized layer or barrier layer is formed. It turned out that such a film is particularly well suited to a pretreated Preserve the area of a workpiece surface, that is, this area from degeneration by storage and / or transport.

In a preferred embodiment of the film is a third Layer between the carrier layer and the second layer arranged, wherein the third layer is formed as a release layer is. By remaining as a release layer formed third layer remains the second layer when removing the film on the workpiece surface.

The technical problem continues according to the invention by the use of a film, preferably an inventive Foil, for temporary covering and protecting a pretreated area of a workpiece surface solved.

Further Features and advantages of the method or use can the following description of three embodiments are taken, with reference to the accompanying drawings is taken.

In show the drawing

1a E a first embodiment the method according to the invention or the use according to the invention,

2 a pretreatment of a film for a second embodiment of the method according to the invention or the use according to the invention,

3 An embodiment of a film according to the invention for a third embodiment of the method according to the invention or the use according to the invention and

4 A fourth embodiment of the method according to the invention or the use according to the invention.

In the 1a to 1e a first embodiment of a method according to the invention is shown. 1a shows the first process step, in which a workpiece surface 2 in one area 4 with an atmospheric plasma jet 6 is pretreated. The plasma jet 6 comes with a plasma nozzle 8th generates a nozzle tube 10 made of metal, which is conical to an outlet opening 12 tapered and one to the outlet opening 12 subsequent outlet pipe 14 with an outlet opening 16 includes. At the exit opening 16 opposite end has the nozzle tube 10 an inlet device 18 with an inlet 20 for a working gas, for example for compressed air. An intermediate wall 22 the inlet device 18 has a wreath of holes 24 on, through which the working gas is admitted. Are the holes 24 obliquely set in the circumferential direction, the downstream, conically tapered part of the nozzle tube of the working gas in the form of a vortex 26 flows through, the core on the longitudinal axis of the nozzle tube 10 runs. The training of the vortex 26 is beneficial for the stability of the arc discharge, but not necessary.

At the bottom of the partition 22 is an electrode in the middle 28 arranged coaxially protrudes into the tapered portion of the nozzle tube. The electrode 28 is electric with the partition 22 and the remaining parts of the inlet device 18 connected. The inlet device 18 is through a ceramic tube 30 electrically against the nozzle tube 10 isolated. About the inlet device 18 gets to the electrode 28 a high frequency high voltage, such as an AC voltage or a pulsed DC voltage applied by a high frequency transformer 32 is produced. The primary voltage is variably adjustable and is for example 300 to 500 V. The secondary voltage can be 1 to 10 kV or more. The frequency is for example in the order of 1 to 100 kHz, preferably in the range of 10 to 50 kHz, and is preferably also adjustable. The inlet device 18 is with the high frequency transformer 32 via a flexible high voltage cable 34 connected. The inlet 20 is connected via a hose, not shown, with a compressed air source with variable throughput, preferably with the high frequency generator 32 is combined to a supply unit. The nozzle tube 10 is grounded.

The applied voltage becomes a high-frequency discharge in the form of an arc 36 between the electrode 28 and the nozzle tube 10 generated. Forms in the nozzle tube 10 a gas vortex, so by the swirling flow of the working gas, this arc in the vortex core on the axis of the nozzle tube 10 channeled. The arc branches in the area of the outlet opening 12 to the wall of the nozzle tube 10 , The working gas that is in the area of the vortex core and thus in the immediate vicinity of the arc 36 rotated at high flow rate, comes into intimate contact with the arc and is thereby partially transferred to the plasma state, so that a beam 6 an atmospheric plasma, such as in the shape of a candle flame, from the outlet opening 16 the plasma nozzle 8th exit.

Upon impact of the plasma jet 6 on the workpiece surface 2 becomes the plasma jet 6 expanded and the workpiece surface 2 pretreated in this area.

The pretreatment with the plasma jet leads on the one hand to a cleaning of the surface, on the other hand to an activation of the surface, for example by an increase in the surface tension or improvement of the wettability. By a method of the plasma nozzle 10 or the workpiece surface 2 can the entire pretreated area 4 the workpiece surface 2 pretreated.

Instead of a pretreatment with an atmospheric plasma jet the surface can also be treated with a low-pressure plasma treatment, a flame, an electrical discharge, in particular with a Corona discharge, or with another surface treatment method pretreated.

After pretreatment of the workpiece surface 2 becomes the pretreated area 4 as in 1b shown with a foil 46 covered and protected. At the slide 46 it can be, for example, a plastic film, preferably of polyolefins such as polyethylene or polypropylene, of PIB, PVC-P, PA or rubber, in particular of ethylene-vinyl acetate-modified polyolefins, or a paper sheet. The foil 46 can be coated or uncoated. She can continue on at least one side, preferably on the area 4 pretreated side facing. Sticks the foil 46 in the area 4 not alone by auto-adhesion can be attached to the film 46 Optionally, a primer and / or adhesion promoter may be provided.

In the 1c shown workpiece surface 2 is now in the pretreated area 4 through the foil 46 covered and protected, so that the degeneration of the pretreated area is reduced or prevented. The workpiece with such a covered and protected workpiece surface 2 can now be stored for example over a period of time and / or transported from a first to a second location, for example, from one factory to the next.

Before carrying out the planned work step, the film, as in 1d shown again from the pretreated area 4 the workpiece surface 2 for example, by peeling in the direction of the arrow 48 away. The pretreated area 4 points after removing the foil 46 little or no degeneration from its condition immediately after pretreatment. Because the degeneration after removing the film 46 again, the film will 46 preferably only immediately before carrying out the planned work step of the area 4 away.

The workpiece surface 2 is in 1e subjected to a planned operation, in which the pretreated area 4 with one in the direction of the arrow along the area 4 moving printhead 50 is printed. The imprint 52 sticks very well in the area 4 because the printability of the workpiece surface in this area by the pretreatment with the plasma jet 6 has been improved and this property, despite storage and / or transport due to the with the film 46 coverage and protection has not or only slightly deteriorated.

Of course, instead of a printing process, any other work steps are conceivable that pretreatment of the area 4 require. In particular, a bond or a coating come into consideration.

In a second embodiment of the method according to the invention, the film is pretreated at least on one side. It can, for example, as in 2 shown a plasma nozzle 60 used in this case, substantially identical to those in 1a shown plasma nozzle 10 is trained. Identical components are identified by the same reference numerals.

With the plasma nozzle 60 becomes the plasma jet 6 generated, with the then the front 62 a trained as a tape foil 64 is pretreated. Alternatively, also the back 66 the foil 64 pretreated. The foil 64 will be in the direction of the arrow 68 through the plasma jet 64 moved and then to a taper roll 70 wound. The finished taper roll 70 can then be stored, for example, and if necessary from this a piece of the film 64 be cut off so as to cover and protect a pretreated area of a workpiece surface. The front 62 the foil 64 becomes in storage as Taperolle by the back 66 protected the underlying winding. This protection is preferably improved by the fact that the back 66 the foil 64 pretreated.

Instead of a pretreatment with an atmospheric plasma jet, the film 64 Of course, also be pretreated with a low-pressure plasma treatment, a flame or an electrical discharge, in particular with a corona discharge.

The foil 64 can optionally be coated simultaneously during the pretreatment, for example with a functionalized layer, in particular with primers and / or adhesion promoters, with a release layer or barrier layer. For this, the plasma nozzle 60 optional in the area of the outlet pipe 14 a precursor feed 72 which is connected to a precursor reservoir (not shown). In this way, the precursors in the plasma jet 6 are introduced, and these are then through the plasma jet 6 on the slide 64 deposited, so that there is a layer formation. Preference is given to using precursors with which a coating can advantageously be carried out with a plasma jet. These include, for example, precursors in which a plasma polymerization takes place in the plasma jet.

In a third embodiment of the method according to the invention, the film has, as in 3 shown several layers on. It is the film 80 to an embodiment of the film according to the invention. The foil 80 has a front side 82 and a back 84 and faces from the front 82 to the back 84 towards a functionalized layer 86 , a carrier layer 88 , a barrier layer 90 and a release layer 92 on.

In the carrier layer 88 For example, it is a plastic film, preferably polyolefins, such as polyethylene or polypropylene, PIB, PVC-P, PA or rubber, in particular from modified with ethylene vinyl acetate polyolefins, or paper. The barrier layer 84 may preferably be formed as a metallization or water barrier layer. The release layer 86 can, for example consist of fluorine compounds or siliconized paper. The functionalized layer 86 For example, it may comprise a primer and / or an adhesion promoter, in particular based on silane.

Alternatively, of course, another arrangement of the individual layers and / or the waiver of single or multiple layers is possible. Several properties of the layers listed above can also be realized in a single layer. For example, a water-impermeable carrier layer 88 be provided.

In 4 A fourth embodiment of the method is shown. The workpiece surface 2 was after pretreatment in the area 4 through the foil 100 covered and protected. The foil 100 has a first layer 102 and a second layer 104 on. For example, the first layer may be 102 around a carrier layer and in the second layer 104 to act as a functionalized layer. When peeling off the film 100 in the direction of the arrow 106 the second layer remains 104 at least partially on the workpiece surface 2 , The workpiece surface can then be subjected to the planned work step.

At the in 4 embodiment shown is through the film 100 thus covering and protecting as well as coating the area 4 reached. If the second layer has silanes, for example, it can be applied to the workpiece surface in this way 2 a functionalization can be achieved.

The Features described in the embodiments and Process steps can of course be made by the skilled person be combined in an appropriate manner, so that a variety of different possible procedures results.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• EP 0761415 [0004]

Claims (16)

Method for the temporary preservation of a pretreated surface, - in which at least one region ( 4 ) of a workpiece surface ( 2 ) is pretreated for a planned work step and - in which the pretreated area ( 4 ) of the workpiece surface ( 2 ) is at least partially subjected to the planned operation, characterized in that - the at least one region ( 4 ) after pretreatment with a film ( 46 . 64 . 84 . 100 ) is covered and protected, and - that the film ( 46 . 64 . 84 . 100 ) is removed before carrying out the planned work step. Method according to claim 1, characterized in that the pretreated area ( 4 ) is covered and protected in sections. Method according to claim 1 or 2, characterized in that the area ( 4 ) of the workpiece surface ( 2 ) with an atmospheric plasma jet ( 6 ), with a low-pressure plasma treatment, with a flame or with. an electrical discharge, in particular pretreated with a corona discharge. Method according to one of claims 1 to 3, characterized in that the planned operation a Gluing, a pressure and / or a coating comprises. Method according to one of claims 1 to 4, characterized in that the film ( 46 . 64 . 84 . 100 ) prior to covering and protecting at least on the side of the workpiece surface facing with an atmospheric plasma jet ( 6 ), pretreated with a low-pressure plasma treatment, with a flame or with an electrical discharge, in particular with a corona discharge. Method according to one of claims 1 to 5, characterized in that the film ( 46 . 64 . 84 . 100 ) substantially of flexible plastics, preferably of polyolefins such as polyethylene (PE) or polypropylene (PP), of polyisobutylene (PIB), soft polyvinyl chloride (PVC-P), polyamide (PA) or rubber, in particular of ethylene-vinyl acetate-modified polyolefins, or made of paper. Method according to one of claims 1 to 6, characterized in that the film ( 46 . 64 . 84 . 100 ) on the area ( 4 ) of the workpiece surface ( 2 ) facing side ( 62 . 82 ) is functionalized by a coating, in particular functionalized by means of a primer and / or an adhesion promoter. Method according to one of claims 1 to 7, characterized in that the film ( 46 . 64 . 84 . 100 ) on the area ( 4 ) of the workpiece surface ( 2 ) facing side ( 62 . 82 ) Has silicon compounds. Method according to one of claims 1 to 8, characterized in that the film ( 46 . 64 . 84 . 100 ) on the area ( 4 ) of the workpiece surface ( 2 ) ( 62 . 82 ) and / or averted side ( 66 . 84 ) a release layer ( 92 ) having. Method according to one of claims 1 to 9, characterized in that when removing the film ( 46 . 64 . 84 . 100 ) a layer ( 104 ) remains on the area of the workpiece surface. Method according to one of claims 1 to 10, characterized in that the film ( 46 . 64 . 84 . 100 ) a barrier layer ( 90 ), in particular a water and / or oxygen barrier layer. Method according to one of claims 1 to 11, characterized in that the film ( 46 . 64 . 84 . 100 ) is metallized. Method according to one of claims 1 to 12, characterized in that the film ( 46 . 64 . 84 . 100 ) is provided as a tape before masking and shooting. Film for the temporary preservation of a pretreated surface, - with a carrier layer ( 88 ), - with a second layer, characterized in that - the second layer as a release layer ( 92 ), functionalized layer ( 86 ) or barrier layer ( 90 ) is trained. A film according to claim 14, characterized in that a third layer between the carrier layer ( 88 ) and the second layer, the third layer being a release layer ( 92 ) is trained. Using a foil ( 46 . 64 . 84 . 100 ), in particular a film according to claim 14 or 15, for temporarily covering and protecting a pretreated area ( 4 ) of a workpiece surface ( 2 ).