TAMPOPRINT AG, machines de tampographie, ALFALAS systèmes laser, automations, accessoires, pad, forms

Accessories Pad - forms

4 pad basic forms

All pads have a curved (convex) surface.
This is necessary to guarantee a rolling movement (see rolling characteristics) during the ink pick up and subsequent application which ensures a good printing image and prevents the inclusion of air bubbles.
The shape of the pad is usually determined by the shape of the print image and the geometry characteristics of the printing part.

The various pad shapes can be classified into four groups:

Round pads
Oval pads
Square pads
Elongated pads

The shape of the pad also determines the orientation of the print image in regard to the pad (see pad contact point) depends on the pad shape. Round, oval and square pad shapes have a contact point (see print image centre).

Elongated pad shapes have a contact line (see print image centre).

As a rule, the pad should not make the initaial contact in the middle of the print image because the biggest compression occurs in this area.

Generally the following rules apply when choosing a pad:

Selection of the pad shape

TIP:

The steeper or pointed the shape of the pad, the harder and bigger the volume, the better the printing result.

When printing uneven parts, the selection of the right pad shape and pad hardness (see Shore-A) determines the quality of the print image and the print speed.

Certain cliché types require the use of steeper pad shapes in higher Shore-A areas depending on the etching depth and / or the halftone.

A = mm printing area B = mm pad installation height C = mm holding plate	pad basic shape	pad rolling up area	primary use
	rectangle	top roof	+ long printing images
	rectangle	top roof ridge	+ long printing images + precise pad contact point
	rectangle	undercut	+ concave surfaces + printing image near to angle
	rectangle	saddle shape	+ precise pad contact point + small rolling up radius
	rectangle	spherical shape	+all purpose all-rounder
	rectangle	sharp	+ structured surfaces
	rectangle	fish belly shape	+ surface printings with contact point in the printing image
	rectangle	shoulder
	rectangle	concave pad	+ low printing pressure for big pad shapes + concave surface
	rectangle	longitudinal borehole	+ low printing pressure for big pad shapes + cylindrical printing parts
	rectangle	cross hole	+ low printing pressure for big pad shapes + cylindrical printing parts
	round	spherical shape	+ all purpose all-rounder
	round	steep	+ low rolling up radius
	round	shoulder	+ concave surfaces + printing image near to angle
	round	flat	+ low printing pressure + all purpose all rounder
	round	pointed	+ structured surfaces
	round	undercut	+ concave surfaces + printing image near to angle
	round	asymmetrical
	round	ring form
	round	concave pad	+ low printing pressure – big rolling up area + concave surfaces
	square	spherical shape	+ all purpose all-rounder
	square	pointed	+ structured surfaces
	square	flat	+ low printing pressure + all purpose all-rounder
	square	concave pad	+ low printing pressure – big rolling up area + concave surfaces
	oval	spherical shape	+ long printing images
	oval	top roof	+ all-rounder
	oval	saddle shape
	oval	fish belly shape
	special	ring form	+ lateral part printing (contactor)

TAMPOPRINT^® AG , Lingwiesenstrasse 1, 70825 Korntal-Münchingen, Germany, phone: +49 7150 928-0, fax: +49 7150 928-400, info@tampoprint.de
Chairman: Wilfried Philipp, Managing director: Albrecht Schrayßhuen, Chief Executive Director: Willy Baumann, VAT Ident. No. DE811243767, Registy office AG HRB 206245