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Moulding comprising plastic and reinforced by natural fibre

A technology for moulding bodies, moulding materials, applied in the direction of flat products, woodworking appliances, household components, etc.

Inactive Publication Date: 2005-02-02
马库斯·雷滕巴赫尔
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In all these cases, however, residual water is still present during the extrusion process, causing the molded body to swell to a greater or lesser extent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 4

[0058] Compared to Example 3, fine corn flour (ground corn kernels containing 70% by weight starch) was added to the formulation. The result is the following composition:

[0059] 71% wood chips by weight

[0060] 15% by weight polypropylene

[0061] 12% by weight of corn flour (11% by weight of water)

[0062] 2% by weight adhesion promoter

[0063] The extrusion conditions were the same as those in Example 3, the flow rate of the raw material entering the extruder was 20kg / h, and the exit velocity of the profile at the end of the die was about 1m / min.

[0064] Utilizing this formulation and the conditions described above, skirting boards of good shape can be produced.

Embodiment 5

[0066] The steps are the same as in Example 4. Compared with Example 4, the only change was that the flow rate of the raw material mixture was initially increased to 80 kg / h. This results in a profile exit velocity of approximately 4 m / min. At this speed, satisfactory, bubble-free profiles can be produced.

[0067] Then, the raw material mixture flow rate was increased to 100 kg / h. This gives the profile an exit velocity of approximately 5.5m / min.

[0068] First, find expansion points (bubbles) in the finished profile. Profiles of satisfactory shape can be produced by opening the vent hole in 1 / 3 of the extrusion box and adding 5% by weight magnesium oxide to the raw material mixture used.

Embodiment 6

[0070] With the help of a single-screw extruder, granules with the following compositions can be produced:

[0071] 67% wood by weight (approximately 11% residual water by weight)

[0072] 15% by weight corn flour (approximately 11% by weight residual water)

[0073] 15% by weight polypropylene

[0074] 2% by weight adhesion promoter

[0075] 1% by weight titanium oxide

[0076] The finished granules prepared from the above raw material mixture (approximately 9% by weight residual water) had a water content of 5% by weight directly after extrusion and showed slight swelling, similar to WO 90 / 14935. Bulk density is 500kg / m 3 .

[0077] These granules without further drying were extruded into profiles in a conical twin-screw extruder. 100kg of expanded granules can be dosed into the extruder per hour. The vent of the extruder was closed.

[0078] Extrusion conditions:

[0079] Temperature in feed area: 150°C

[0080] Temperature in Zone 1: 155°C

[0081] Temperature i...

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Abstract

The invention relates to a moulded body containing plastic and reinforced by natural fibres. Said moulded body is produced from fibrous plant or animal material containing residual water, at least one thermoplastic or duroplastic material, and at least one water-binding biopolymer and / or biomonomer, by means of plastic or thermoplastic deformation at a high temperature and / or high pressure, and then by shaping, preferably by means of extrusion. In spite of a residual water content of between 0.3 and 8 wt. %, the inventive moulded body is in an unexpanded form. The invention also relates to a method for producing said moulded body.

Description

technical field [0001] The invention relates to a non-intumescent molded body comprising plastic, reinforced with natural fibers and containing residual moisture, and to a method for producing the molded body. Background technique [0002] In recent years, interest in natural fiber materials in the plastics industry has increased. In particular, the use of wood fibers, wood flour fillers, and wood chips in so-called "wood-like plastics" or "WPC" materials, which can be processed into profiles by means of extrusion techniques, has thus undergone real flourishing. [0003] However, the problem remains that natural fibers, especially wood, themselves contain a certain amount of residual water even in an air-dried state, so that the quality of profiles made of plastics and wood is often unsatisfactory, and this problem is still present today. has not been satisfactorily resolved. Especially profiles, which are produced at high ejection speeds, develop uncontrollable bubbles a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/10B27N3/28B29C48/00B29C48/09B29C48/12B29C67/24C08J5/04
CPCC08J5/045B29C47/003B29C47/00B29C47/0023B27N3/28B29C48/00B29C48/09B29C48/12
Inventor 马库斯·雷滕巴赫尔
Owner 马库斯·雷滕巴赫尔
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