摘要:
Pelletized materials based on at least one thermoplastically processable polymer, where the pellets have less than 10% of concave regions and otherwise are convex in every other region, this being determined by means of incident-light interference-contrast spectroscopy, by taking the average value for the ratios of the outline area to the entire outline area for an assembly of pellets.
摘要:
An apparatus intended for extruding thermoplastics and having at least one devolatilization orifice and, if desired, also at least one dewatering orifice, which has been equipped with a metal-wire-mesh composite sheet, with a finely perforated metal sheet, or with a slit diaphragm.
摘要:
A shell-and-tube heat exchanger, for removing volatile substances from a polymer solution by degasification, includes a bundle of tubes arranged vertically and parallel to each other in a shell chamber through which a fluid heat-transfer medium flows. The upper end of each tube is fixed in an upper tube sheet and the lower end of each tube is fixed in a lower tube sheet, and the polymer solution flows through the tubes in the direction of gravity. One feature is that a multilayer woven wire fabric is attached to the top of the upper tube sheet. The finest meshed layer of the fabric has a mesh width of 50 μm to 1000 μm. The invention also relates to a method for removing volatile substances from a polymer solution by degasification in a shell-and-tube heat exchanger and use of the shell-and-tube heat exchanger.
摘要:
A shell-and-tube heat exchanger, for removing volatile substances from a polymer solution by degasification, includes a bundle of tubes arranged vertically and parallel to each other in a shell chamber through which a fluid heat-transfer medium flows. The upper end of each tube is fixed in an upper tube sheet and the lower end of each tube is fixed in a lower tube sheet, and the polymer solution flows through the tubes in the direction of gravity. One feature is that a multilayer woven wire fabric is attached to the top of the upper tube sheet. The finest meshed layer of the fabric has a mesh width of 50 μm to 1000 μm. The invention also relates to a method for removing volatile substances from a polymer solution by degasification in a shell-and-tube heat exchanger and use of the shell-and-tube heat exchanger.
摘要:
An attachment for an oral hygiene device is disclosed. The attachment includes a housing; a shaft element movably arranged within the housing and arranged for being coupled to a drive shaft of a handle of the oral hygiene device; and a flexible sealing element attached to the shaft element. The flexible sealing element is arranged to seal a cavity within the attachment intended for accommodating at least a part of the drive shaft in an attached state.
摘要:
A device and a method for imaging an animal including an animal holding device for keeping the animal immobile and at a desired temperature during the scanning operation for imaging the animal in real-time in a non-destructive manner.
摘要:
An imaging device for imaging an anaesthetized animal such as a rodent (rats or mice or other animals), with the device having a split array coil capable of providing at least two channels for use in a restraining assembly with animal bed for magnetic resonance imaging (MRI) the animal in real-time in a non-destructive manner.
摘要:
A medical punch with a hollow shaft, a tool point that is positioned on the distal end of the shaft and includes a rigid cutting part and a cutting part that can slide with respect to the rigid cutting part, and with a handle positioned on the proximal end of the shaft, such that the displaceable cutting part and the handle are operatively connected with one another by a push/pull device that is displaceably mounted in the hollow shaft and an anti-tilt mechanism is positioned on the tool point to stabilize the cutting parts in their axially parallel alignment to one another. The rigid cutting part includes a sleeve-shaped proximal portion that encloses the displaceable cutting part and a distal punch portion configured as a single unit with the sleeve-shaped portion and that the rigid cutting part should be detachably connected with the hollow shaft by a coupling mechanism formed on the sleeve-shaped portion.
摘要:
A medical access device for creating an access to a body for minimally invasive intervention has a hollow body assembled from at least two parts having longitudinal extending edges. Each part has a distal body portion and at an angle to the latter a proximal body portion. A locking mechanism locks the assembled proximal hollow body portions. The locking mechanism has a hook projecting from an edge of a proximal body. A nose of the hook can enter from proximal to distal in a recess in an edge joining said edge having said hook.
摘要:
A medical instrument has a cannula, a seal disposed in the cannula. An expansion device serves for expanding the opening in the seal for guiding shafts of other instruments of greater diameter in a sealed manner through the expanded opening. The expansion device has an expansion cone with a plurality of slats mounted pivotably on an annular body at a first end thereof, a second end of the slats, being connected to the seal in an area of the opening. The slats can either be connected at its first ends to the annular body via spherical heads engaged into corresponding openings in the annular body or the slats are connected at their ends via film hinges to the annular body.