Method and device for the production of moulded pieces from a layer of polyurethane

A polyurethane layer and molded parts technology, which is applied in the direction of spraying device, liquid spraying device, coating, etc., can solve the problem of adding reaction mixture to the coating mechanism or spraying mechanism, and achieve low consumption of raw materials, small cycle time and fast cycle time The best effect

Active Publication Date: 2010-02-17
HENNECKE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] But after this necessary injection interruption, the injection system must maintain full working capacity, that is, it

Method used

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  • Method and device for the production of moulded pieces from a layer of polyurethane
  • Method and device for the production of moulded pieces from a layer of polyurethane
  • Method and device for the production of moulded pieces from a layer of polyurethane

Examples

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Example Embodiment

[0093] in figure 1 Shown therein is a device 1 with a mixing head 2 and a spray nozzle 3 (which acts as a spray device and contains a 90° arc 4) for spraying the polyurethane reaction mixture onto the substrate 5. The reaction components polyol A and isocyanate B are transported from the storage container through a metering device (not shown in the schematic diagram) to the high-pressure mixing head 2 via a connecting pipe, and are mixed with each other in the high-pressure mixing head 2. Immediately afterwards, the reaction mixture is squeezed through the flow channel of the jet nozzle 3 (with a 90° arc) and is coated in the jet 6 on the substrate 5. The substrate 5 here means that it has obvious pits and inverts. The tool surface of the tool in the concave part (ie, the pit that is difficult to access).

[0094] The ejected reaction mixture reacts on the surface of the tool (substrate 5), thereby producing a surface layer 7, which can then be post-foamed in a subsequent process...

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Abstract

The invention relates to a method and a device for the production of moulded pieces comprising a layer of polyurethane by spraying, wherein a gas stream is introduced into the flow channel (11) of the spray device (3) in at least two positions.

Description

technical field [0001] The invention relates to a method and a device for producing molded parts comprising a polyurethane layer during an injection operation, wherein a gas flow is introduced into the flow channel of the injection device at at least two points. Background technique [0002] If it is a case where reactive plastics such as polyurethane are to be applied evenly on the substrate, at least spraying is used as an application technique. In highly reactive raw material systems, especially in injection operations, so-called high-pressure mixers are used, followed by special injection nozzles. An example of such an injection system is described in EP 0303305B1. [0003] Since such jet mixing heads are usually controlled by a robot which has to perform extremely fast movements, it is particularly advantageous for the jet mixing head to be constructed small and (and thus also) light. [0004] However, for three-dimensional injection layers, especially for molded part...

Claims

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Application Information

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IPC IPC(8): B05B7/00
CPCB05B7/0475B29K2075/00B29C41/08B05B7/0491B29C67/246B05B7/0458
Inventor W·波利克D·奥贝洛尔I·克莱巴
Owner HENNECKE
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