DE2412878A1 - Insulator for a plastics-film processing roller - used for surface-treating film to render it suitable for accepting print - Google Patents

Abstract

Insulation for a film pre-treating roller comprises an insulating tape wound onto the roller in abutting (i.e. non-overlapping) windings. The insulation stabilises the electrical discharge with which the plastics film is being treated so as to render it printable-upon. The insulation is more easily applied to the roller than prior-art silicone-type tubular coverings. Risk of voids is minimised.

Description

TITLE: Isolation of a pretreatment roller.

APPLICATION: The registered news is used in printing pre-treatment technology (by means of electrical discharge) of plastic films for the purpose of increasing the Surface adhesion.

PURPOSE: Stabilization of the electrical ntl ,.

? TAh'C DER TECHNIK: As is well known, a pretreatment roller must be included be coated with a thermally stable and electrically resistant material » so that there is a uniform electrical discharge between the electrical element and the roller comes. It is common to use a silicone-like tubular insulation for this purpose to be used with a wall thickness of approx. 2-3mm Fig.1 P.3.

In the industry it is also common to use the pretreatment rollers Fig.1 Cover P.1 with other insulation such as synthetic resin or plastic sheeting.

FINDINGS: Registration. P 2108943.0, G 7107057.0, P 1765369.9, P 38179/21 and various plastic magazines.

PRIOR ART REVIEW: Have the noted types of isolation the disadvantage of being easily mechanically vulnerable, which leads to the so-called breakdown and Operational failure of the pretreatment system leads. Can also be used in the manufacture of the The materials mentioned above do not achieve a sufficiently high degree of homogeneity1 rather too often do they have cavities or cavities in them, and those sooner or later as well lead to unwanted breakdowns. Also advised when pulling a hose or other insulation Abbol P.3 slightly foreign between this and the roll wall Fig.1 P.2 Particles, whereby an intensified electrical discharge takes place and in turn a electr, breakdown occurs.

Experience has shown that, for the reasons given, one of the previously usual isolations hardly work flawlessly for more than a few months.

TASK: To provide roller insulation that has the disadvantages mentioned excludes, moreover, easy to apply to the rollers and is cheap.

LCSUNG: Fig. 2 + 3 show such an isolation. In Fig.3 it is in Section given enlarged.

The klalze is made into layers or layers with a tape a few cm wide wound up Fig.3 P.7 and P.8-11 Fig.3 P.6 shows the roll wall.

This creates a corona-like discharge within the roller insulation it is important to wind up the insulation (or the insulation tape) in such a way that that no cavities arise, this is achieved by being within a layer the tape is wound up butt against each other, i.e. continuously wound up without gaps; e.g. Fig.3 P, 8.

All subsequent insulation layers are applied in the same way the roller applied, but shifted in the direction of the roller axis by about 1/2 bandwidth. This shift from layer to layer is about 1/2 or 1/3 of the bandwidth the purpose that the current path extended from the outside Fig.3 F.10 to the roller wall P.6 will. The number of layers can be arbitrary and depends on the insulation made claims.

The individual insulation layers as well as the joints can also be sealed with a filler, so that a total freedom from voids is guaranteed and thus any corona-like discharge within the insulation is avoided.

To prevent dirt, dust or foreign bodies from adhering to the surface To avoid the roller insulation, the last layer of the 0 insulation can be made of a Teflon-like material, as this is known all these Repels foreign bodies.

At each end of the pretreatment roller there are discs Fig.2 P.5 attached from an insulation material, which ensure contact protection.

The same insulation can be made from individual elastic hose pieces be applied that butt against each other within a layer. As with winding Fig. 3 is also here to shift each subsequent layer by half the width.

REQUIREMENTS: 1 insulation of a pretreatment roller excellent, that this is made of a strip-shaped insulation material Fig.2 P.4.

2) insulation of a pretreatment roller according to claim 1) characterized by excellent, that the tape butt butt against each other without overlap in layers from turn to turn is applied Fig. 2 + 3 P, 7.

3) insulation according to claim 1 + 2) characterized in that the successive Isolation layers by half a bandwidth against each other in the axial direction be moved Fig.3 P.8 + 9.

Claims (1)

4) Isolation of a pretreatment roller excellent in that instead of tape, it consists of several pieces of tubing a few centimeters wide is applied in layers Fig. 4 + 5.