PRODUCTS
Keeper 900 & 1300

HDS have been sucessfully manufacturing and supplying this range of ultrasonic document encapsulators  to institutes world-wide since 1992.

Our focus has  alway been on quality and reliability.



     Featured on all machines


  • Weber 400W - 40KHz ultrasonic generator. See generator data
  • Probe Tip Cooling fitted as standard.
  • Ultra Long life and maintenance free precision linear drive system for reliability and a smooth & quiet operation.
  • Micro Head (Thickness) Adjustment.
  • Micro Head Adjustment Lock.
  • 12 VDC Parvalux permanent magnet motor.
  • Fully automatic drive system with built in safety interlocks.
  • Interlocking table with screen-printed grid and magnetic mat to expel air and support document whilst welding.
  • Spot weld facility.
  • Fully enclosed mechanical parts for operator safety.
  • For use with polyester (Mylar and Melinex) from 50 to 175 microns.
  • Suitable for welding polyester to paper or thin card and bondina etc.


Specifications: Keeper 900 Keeper 1300
Supply Voltage 230 VAC or 110 VAC 230 VAC or 110 VAC
Dimensions 1260 x 840 x 450 mm 1660 x 960 x 450 mm
Weld Length 890 mm 1290 mm
Weight Approximately 50Kg Approximately 60Kg

Micro Head Adjustment


Used for the precise setting of the probe tip height depending on the film thickness.

Probe height Lock



Keeps a fixed height setting during the welding process.

Recommended to be used on thicker films, or for when welding film to thin card.

Probe Tip Cooling


Maintains a steady stream of cold air to stabilize the heat build up transmitted from the weld. 

This is important to establish a consistent and repeatable weld, especially for long welds.


Ultrasonic Generator:

a) Power on indicator.

b) Function Indicator.

c) Function Selector. Used to set Amplitude (50-100%)

d) Test Button.

e) Power Output Display.


Speed Controller







  •  a) Mains Power On-Off Switch
  •  b) Output on
  •  c) Spot Weld
  •  d) Left Direction Indicator – the head will drive left
  •  e) End-Stop Indicator Machine end of travel.
  •  f) Direction Switch – Centre Position is Off/Stop
  •  g) Right Direction Indicator.
  •  h) Stop Button – Stops the weld & drive cycle
  •  i)  Start Push Button – Starts head in the direction  set.
  •  j) Variable Speed Control – Controls the speed  that the head will travel. 

Ultra long life precision linear drive unit

1 Toothed belt drive 9 Grease nipple
2 Toothed belt 10 Guidance slides
3 Guidance section 11 Adapter plate
4 Guidance shaft with support section 12 Toothed belt steering
5 Toothed belt tensioning kit 13 Cover
6 Roller cover 14 Felt wiper
7 Guidance shaft lubrication
8 Roller
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