Abstract A method for producing holes in a workpiece by means of a laser beam which comprises the steps of coating at least one face of the workpiece with an organic agent prior to contact of the laser beam with the workpiece in order to thereby prevent a fusion of the workpiece material ejected in liquid state with an outer face of such workpiece during the boring process. There is also disclosed an apparatus used in the performance of this method and for coating both sides of disc-shaped workpieces which incorporates two band members guided above one another at a spacing along a predetermined path. This spacing of the band members is smaller than the height of the workpieces. One of the band members has a smooth surface and the other an adhesive surface, and two coating locations are arranged such that one is before and the other behind the aforementioned predetermined path.
Method as defined in claim 1, wherein said coating agent contains a copolymer of methylmethacrylate, butylacrylate and quarternized N,N-dimethylaminoethylmethacrylate.
Claim 2
Dependent Claim
19 words
Method as defined in claim 1, wherein said coating agent contains a copolymer of methylmethacrylate, decylmethacrylate and quarternized N,N-dimethylaminoethylmethacrylate.
Claim 3
Dependent Claim
18 words
Method as defined in claim 1, wherein said coating agent contains a poly blend of polyvinylalcohol-polyvinylacetate and poly-N,N-dimethylaminoethylmethacrylate.
Claim 4
Dependent Claim
13 words
Method as defined in claim 1, wherein said coating agent contains a sugar.
Claim 5
Dependent Claim
15 words
Method as defined in claim 1, wherein said coating agent contains a quarternized ammonium compound.
Claim 6
Dependent Claim
14 words
Method as defined in claim 6, wherein said quarternized ammonium compound is trimethyldecylammonium chloride.
Claim 7
Dependent Claim
12 words
Method as defined in claim 1, wherein said coating agent contains poly(vinylacetate-vinylalcohol).