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Method and apparatus for increasing the intrinsic viscosity of a polycondensate melt

A technology of intrinsic viscosity and polycondensate, which is applied in the field of improving the intrinsic viscosity of polycondensate melt under negative pressure, and can solve problems such as polymer damage and high energy usage

Active Publication Date: 2015-09-23
NEXT GENERATION RECYCLINGMASCHEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Each heating causes irreversible damage to the polymer in many plastics, also these heating and cooling processes imply high energy usage which simultaneously results in lower value polymers

Method used

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  • Method and apparatus for increasing the intrinsic viscosity of a polycondensate melt
  • Method and apparatus for increasing the intrinsic viscosity of a polycondensate melt
  • Method and apparatus for increasing the intrinsic viscosity of a polycondensate melt

Examples

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Embodiment Construction

[0032] exist figure 1 and 2 is shown as an example of a recycling plant which has, in the assembly designated by 1 , a device for comminuting and extruding condensation polymers, for example fibers made of PET or other condensation polymers, films, deep-drawn films. This assembly can be constructed as known from the prior art and is not the subject of the present invention. The recycling plant is described exemplarily for the recycling of PET, but is not limited to this plastic.

[0033] For example, recycled PET or new PET pellets can be fed to the extruder via a feeding system (single-shaft shredder, cutting compressor, silo, metering device for pellets, etc.) as required. Depending on the charging system, the raw materials (fibers, transport agglomerates, plastic bottle abrasives, membranes, granules, etc.) sent to the extruder.

[0034]It has proven to be very advantageous if the extruders listed above are equipped with degassing devices known from the prior art. Beca...

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Abstract

In a method and an apparatus for increasing the intrinsic viscosity of a polycondensate melt at negative pressure, the melt enters a chamber, in which a negative pressure of less than 20 mbar prevails, through a perforated plate or a screen having openings with a diameter of less than 0.5 mm. The melt passes through this chamber in free fall in thin threads and remains in a reservoir beneath the chamber for at least one minute. The melt is moved constantly in the reservoir, and discharged from the reservoir, by a helical mixing and discharge part.

Description

technical field [0001] The invention relates to a method for increasing the intrinsic viscosity of a polycondensate melt under reduced pressure. [0002] Furthermore, the invention relates to a device for increasing the intrinsic viscosity of a polycondensate melt, said device having a chamber under negative pressure, said chamber having at least one opening through which the melt enters in the cavity and the melt can pass through the opening without contacting the cavity. Background technique [0003] Polycondensates (PET, PBT, PEN, PC, etc.) are thermoplastics produced by polycondensation. In polycondensation, the monomers are combined into polycondensates by fractional reactions through cracking of reaction products (eg water). Polycondensation is thus associated with chain growth. This molecular chain length decisively determines the mechanical properties of the product and also of the polycondensate. This process is not only important in the manufacture of new items...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C47/76C08G63/78C08G63/80B29C48/52B29C48/59B29C48/64B29C48/76
CPCB29B7/728B29C47/6031B29K2067/003B29C47/62B29C47/0009B29B7/60B29C47/622B29C47/6075B29B9/06C08G63/785B29B7/421B29C47/6018B29B7/66B29B7/726B29C47/6043B29B7/429C08G85/00B29B9/16B29C47/6012B29C47/76B29C48/76B29B7/428C08J11/06B29C48/52B29C48/59B29C48/53B29C48/64B29C48/54B29C48/56B29C48/645B29C48/03C08G85/002C08J2367/02Y02W30/62
Inventor T·皮希勒D·黑亨伯格H·贝豪恩B·皮希勒
Owner NEXT GENERATION RECYCLINGMASCHEN