In the manufacture of plastic pipes having smooth walls on the inside but circumferential ribs on the outside from extrudable, in particular thermoplastic material, such as PVC, a good filling of the cavities provided for forming the ribs in the travelling hollow mould is achieved by these ribs being filled with the melt first of all away from the parting plane of the travelling hollow mould and f...

In the manufacture of plastic pipes having smooth walls on the inside but circumferential ribs on the outside from extrudable, in particular thermoplastic material, such as PVC, a good filling of the cavities provided for forming the ribs in the travelling hollow mould is achieved by these ribs being filled with the melt first of all away from the parting plane of the travelling hollow mould and f...

A pouch has internal base material (24) having concave grooves (CG, 28, 29, 30) contg. gas former and parallel walls [(61,63), spreads when inflated . The 1st CG(28 or 33) has the 1st chemical i.e. citric acid aq. soln. and sealed together with burstable/ nonpermeable cover sheet (41 or 43) to keep chemical in CG. The 2nd CG (28 or 33) and water soluble sheet (43 or 44) (i.e. PVA film, dissolve ...

The application of end plates to packing container bodies is done customarily in that preformed end plates are placed in the desired position and are sealed with the help of sealing jaws, which as the material is thermoplastic comprise means for heating the material. The sealing jaws operate with large forces and the arrangement is relatively complicated. A simpler method and an arrangement for th...

The application of end plates to packing container bodies is done customarily in that preformed end plates are placed in the desired position and are sealed with the help of sealing jaws, which as the material is thermoplastic comprise means for heating the material. The sealing jaws operate with large forces and the arrangement is relatively complicated. A simpler method and an arrangement for th...

Contamination of wafers is reduced by an enclosed full-flow method and apparatus for the cleaning and other wet processing of semiconductor wafers. Process fluids flow sequentially and continuously past the wafers such that the processing does not require movement or operator handling of the wafers between processing steps. The vessel containing the wafers is hydraulically full during each process...

A roll cutting machine serves for longitudinally dividing a paper-machine-wide web (10) in a slitting or cutting station (30). A drawing-in device is provided having a drawing-in rod (41) which can be led on a chain (43) through the machine and to which the end of the web (10) can be secured. The roll cutting machine includes two support rollers (13, 14) on which webs are wound. The drawing-in dev...

Apparatus and methods for use in measuring the moisture content of heavy-grade sheets of paper during their continuous manufacture. In one aspect, means employing infrared absorption techniques for determining the fiber weight per unit area of a sheet having a fiber weight of up to 1100 grams per square meter are provided. In another aspect, means employing infrared absorption techniques including...

A method for injection moulding of a composite parison comprises injecting molten resin into a cavity formed by cooperating mould parts to mould an outer neck portion of the parison and transporting the outer layer still in contact with the corresponding mould part to a second moulding station. Male and female parison forming moulds for forming the main parison portion are brought together at the...

A distance unit (4) supports a tooth prosthesis (17) which can be fixed with dental cement (18). The tooth implant can also incorporate a component (6,13) which holds it together, and which extends through the distance unit downwards into a screw component (2). The component which holds the implant together has an upper inclined surface (16) which coincides with an upper inclined surface (15) on t...

The support plates (2) on the sides of the furnace are provided with load (4) or limit indicators (12), the output signal from w. which indicates when the electrode (1) is lowered to its lower required position, after which a fresh grip position can be adjusted in the electrode jaws. The output signal also stops the movement, of the electrode towards the support plates. - The load (4) or limit (12...

Finely qround metal oxides are mixed together in exact proportions to form a homogenous blend. This is then granulated and heat treated for the granules to crystallise to a homogeneous structure. The crystals are then finely qround to give a homogeneous powder. - In partic. the granulated metal oxide mix. is homogenised in a bed fluidised with hot gas. This is recirculated and heated by the additi...

The parking aid comprises a set of 4 auxiliary wheels which may be lowered into contact with the ground and then driven to move the car laterally. The wheels are lowered by a hydraulic cylinder (3) and driven by a hydraulic motor (4) which drives a pinion mounted on the wheel axis. - The cylinders and wheels are driven by a common hydraulic system which is controlled by the driver in his cab. The ...

A valve membrane (6) is fitted between the inlet and outlet (3) apertures. A spring plate (8) and a tension device (6,13,14) tension the membrane against a valve seat (5) with a predetermined force. The valve seat, in which the outlet aperture issues, is arranged centrally to the membrane. - The valve only opens when pressure in the lateral ventricle, and therefore that on the membrane, the predet...

Collar-pipe (2) E.G. made of synthetic-resin is fitted on the neck- portion (1b) of the shaft (1), rotatably and movably axially. The shaft is aligned in a casting die-former (10) and collar-pipe is formed E.G. by being injection-moulded at temp. of 200 DEG.C around the outer surface of large dia. portion (1a) of the shaft in casting die former E.G. at temp. of 100 deg.C. Then the formed collar-p...