Welding Engineers Ltd. of Geneve at K 2019 in Düsseldorf -- K Trade Fair
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Rubber & TPE

Welding Engineers Ltd.

Rue Saint-Léger 4, 1205 Geneve
Telephone +41 22 3281606
Fax +41 22 3283104

Hall map

K 2019 hall map (Hall 9): stand A76

Fairground map

K 2019 fairground map: Hall 9

Our range of products

Product categories

  • 03  Machinery and equipment for the plastics and rubber industries
  • 03.02  Machinery and plant for processing
  • 03.02.001  Extruders and extrusion lines
  •  Extruders

Our products

Product category: Extruders


The principle of operation of our dewatering extruders (SDU) and drying extruders (VCU) has not changed since the early days. The design has however been constantly developed to meet the industry's new challenges for higher performance, reduced emissions, lower maintenance and ever increasing online time.

In the following pages we present a general description of Welding Engineers' latest system for drying synthetic rubber. The word "latest" implies, of course, that we designed other system prior to this one. In point of fact, our first system  went into operation as far back as in 1946.

Welding Engineers' rubber drying system accepts slurry containing as little as 5 percent solids, thus direct from the slurry tank, using no shaker screen for initial water separation, and delivers rubber dried to specification in pellet or crumb form.

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Product category: Extruders


Slurry Dewatering Unit (SDU)

The aqueous slurry coming from the slurry tank,  is admitted through a pipe  into a feed tank from which it flows uniformly over a static wedge bar screen . The crumbs, thus separated from the free water,  fall into the feed section of the dewatering screw.

The screw, mounted at an angle, is designed to accept the crumb, forward it into the compression section of the screw  and discharge it through a variable die. Cutting is accomplished by knives turning with the screw. The variable die allows to optimise  the pressure conditions and thus the dewatering during operation.

The water expressed from the rubber flows backwards inside the barrel towards the feed zone. The water is removed through drain openings located in the conical and feed barrels.

The extruder (feed sections and barrels) is entirely closed. No water on the floor and no steam inside the plant building. Two flanges,  permit evacuation of vapour. Water drains are directly connected to customer recycle water system. There are no slots or other drain openings that would plug, interrupting the process or causing large variations in the degree of dewatering. Barrels are jacketed for preheating.

The screw can be supported by bearings at both ends, with no contact between screw and barrel.

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Product category: Extruders


Better Product Quality by a Better Process

  •      Closed system
  •      Turbulator with adjustable die sleeve
  •      Inclined dewatering static screens
  •      Reduced fines generation
  •      Large volume feed section
  •      Integrated pelletizer
  •      Totally closed barrels
  •      Flexible layout due to airveying system
  •      SDU variable orifice die
  •      Efficient final drying in a fluidised conveyor
  •      Outboard bearing at SDU discharge end
  •      Reduced housekeeping
  •      Grooved barrels
  •      Low specific power consumption
  •      Wear resistant alloys for screws and barrels

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About us

Company details

Welding Engineers has supplied synthetic rubber finishing lines to the industry for over 50 years.
Welding Engineers Ltd. is located in Geneva, Switzerland.

The company was founded in 1958 as the regional sales offices for the US parent company.

With the rapid growth of the synthetic rubber industry in Europe in the 60' s Welding Engineers took over the engineering, manufacturing and sales of the synthetic rubber dewatering and drying extruders first in Europe, then worldwide.

The extruders have been constantly  evolving to meet the industry's needs for higher capacity, quality and productivity as well as reduced emissions and lower maintenance.

Today, Welding Engineers not only manufactures dewatering and drying extruders for virtually any kind of synthetic rubber, but also supplies complete rubber finishing lines to suit its Customers' needs.

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