摘要:
Molded articles comprising at least one layer of polyurethane are produced in a batch process by mixing polyurethane-forming components to form a reactive mixture that is flowed through a channel having at least one opening through which a gas is introduced and sprayed on a substrate surface. The device suitable for carrying out this batch process includes a cylindrical mixing chamber, a flow channel through which the reactive mixture flows and is sprayed onto the surface of a substrate where it cures thereon. The flow channel is cleaned by a stream of gas.
摘要:
A device and process for the production of single- or multi-layered films or compound moldings which have at least one layer of reactive plastic. The liquid reactive mixture is sprayed from a spray nozzle on to a surface. The jet spray is set in oscillation and the amplitude and/or frequency of the oscillation is adjusted during the spraying operation. Adjustment of the oscillation changes the spray area.
摘要:
The present invention relates to a process for the continuous production of polyurethane sandwich elements comprising an upper outer layer and a lower outer layer and a layer of cellular polyurethane lying in between, which is firmly bonded to the outer layers. This invention also relates to an apparatus suitable for the production of polyurethane sandwich elements as described above.
摘要:
The invention relates to a method for manufacturing polyurethane block foam whereby the reactive components polyol and isocyanate are conveyed in a metered fashion to a mixer 1, are mixed therein and then discharged from the mixer and applied to the substrate paper 3, characterised in that after leaving the mixer the reactive mixture flows through a distributor device arranged immediately above the substrate paper, the flow velocities of the mixture portions flowing out from the edge of the distributor device substantially transversely to the transport direction being higher than the flow velocities of the mixture portions flowing out substantially in the transport direction from the leading edge of the distributor device in the transport direction, and the reactive mixture leaving the distributor device in the form of a film which forms a boundary face with the ambient atmosphere only on the upper side.
摘要:
The invention relates to a process for the production of sandwich elements (so-called panels), in which the rising reactive mixture is guided, when it rises, through guide elements arranged between the upper and lower outer layers. This process produces void-free panels having a regular cell structure. The invention also relates to an apparatus useful for the production of such sandwich elements.
摘要:
The invention relates to a mixing head and to a method of mixing at least one polyol component and at least one isocyanate component and where appropriate additives, to form a polyurethane reaction mixture.
摘要:
Articles, particularly, molded articles are produced from reactive components with an apparatus which includes storage vessels for the reactive components, a mixer for mixing the reactive components, dispensing units and lines for dispensing the reactive components from the storage vessels into the mixer. An important feature of this apparatus is the use of one or more dispensing units which is a piston dispensing unit that includes a dispensing piston and a spindle unit. The spindle unit includes a spindle and a spindle nut which spindle nut is driven by a torque motor.
摘要:
The invention relates to a process for the production of sandwich elements (so-called panels), in which the rising reactive mixture is guided, when it rises, through guide elements arranged between the upper and lower outer layers. This process produces void-free panels having a regular cell structure. The invention also relates to an apparatus useful for the production of such sandwich elements.
摘要:
A method and apparatus for continuously dispersing fine particle-sized solids in liquids by a continuous process, in which a constant stream of liquid is fed into a mixing apparatus and fine-particle-sized solids are metered into the mixing apparatus by means of a metering screw as a function of the pressure prevailing in the mixing apparatus. The solids conveyed by the metering screw are supplied from an intermediate vacuum tank with a controlled filler level.
摘要:
In the production of a reaction mixture which forms plastic material, in particular foamed plastic material, from at least two flowable reaction components, the inlet members or other switch-over members which must be switched over in a precise fashion, and controlled by a sliding valve comprising a slide which is assigned a restoring spring which operates in opposition to a moving electromagnet, and a holding electromagnet. First, the holding electromagnet is fully activated whereupon the moving electromagnet is activated. Following the build-up of force of the moving electromagnet, the holding electromagnet is switched off so that the inlet member or other switch-over member opens abruptly.