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Thermoplastic fibrous materials and method of producing the same

A thermoplastic fiber and fiber material technology, applied in the field of improving the elongation of thermoplastic fiber materials and manufacturing thermoplastic fiber products, can solve the problems of limited design and geometry, limited finished parts, low elongation, etc.

Active Publication Date: 2017-10-13
TEKNOLOGIAN TUTKIMUSKESKUS VTT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, due to the low elongation, the designs and geometries of the manufactured shapes are very limited compared to the corresponding plastic films, limiting the finished part

Method used

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  • Thermoplastic fibrous materials and method of producing the same
  • Thermoplastic fibrous materials and method of producing the same
  • Thermoplastic fibrous materials and method of producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0106] Example 1 Fracture strain

[0107] sheet preparation

[0108] Sheets of thermoplastic fiber material are produced by foam forming methods and dried on plates at room temperature under constrained conditions. Viscose fibers of various lengths and unground bleached pine pulp are used as fiber raw materials. Polyurethane (PU) dispersions are used as thermoplastic additives. The fiber-containing dispersion is mixed with the thermoplastic polymer dispersion. Thus, all raw materials were mixed together, then the suspension was poured on a screen and the water was removed by means of vacuum. The basis weight of the dry sheet is 240g / m 2 up to 350g / m 2 change between.

[0109] Performance Characterization

[0110] The fracture strain values ​​of the prepared sheets were measured. Measurements were performed using a setup in which a heated die with a curved surface was pressed against the attached sample slide and the elongation at break value was recorded. Measurem...

Embodiment 2

[0115] Embodiment 2 Thermoforming

[0116] sheet preparation

[0117] Sheets of thermoplastic fiber material were prepared as in Example 1. The raw materials used are viscose and PU.

[0118] Performance Characterization

[0119] The effect of fiber length on the elongation properties of the prepared materials was evaluated by laboratory scale thermoforming. The sample is attached to the mold placed between the platens. The temperature during forming was 100° C. and the mold depth was 3 cm.

[0120] result

[0121] The thermoforming results are shown in the figure. Increasing the length of the viscose fibers clearly improved the results.

[0122] figure 2 Thermoformed samples are shown, prepared from viscose and PU: 6 mm viscose + PU (left) and 12 mm viscose + PU (right). The basis weight of the sample is about 240g / m 2 , the amount of PU is about 7% by weight of the thermoplastic fiber material formed.

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Abstract

The invention relates to a method for the manufacture of thermoplastic fibrous materials, comprising forming at least one foamed liquid comprising water and at least one foaming agent, forming a dispersion by dispersing fibers including long fibers in said at least one foamed liquid comprising water and at least one foaming agent, mixing the dispersion with a foamable liquid or dispersion comprising at least one thermoplastic polymer, forming at least one foamed dispersion, and conveying the foamed dispersion or dispersions to a foraminous support and draining liquid trough the foraminous support to form a web or a sheet, to obtain the thermoplastic fibrous material. The invention also relates to materials and products obtainable by the method, and uses related thereto.

Description

technical field [0001] The present invention relates to a thermoplastic fiber material or article, a method of manufacturing a thermoplastic fiber material and the use of said thermoplastic fiber material for the manufacture of a thermoplastic fiber article. Furthermore, the invention relates to the use of long fibers for improving the elongation of thermoplastic fiber materials. Thermoplastic fibrous materials or webs, paper or cardboard webs, or paper or cardboard etc. suitable for deep drawing applications are available. Background technique [0002] The use of fibers, especially wood fibers, in making moldable thermoplastic webs has been limited because fibrous webs are generally believed to lack moldability properties. In particular, such fiber materials have insufficient elongation. The elongation of webs from wood fibers is usually very low (2%-4%). This level of elongation is too low for the application of turning a web into a 3D object by using deep drawing. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H13/08D21H13/16D21H13/24D21H13/26D21H13/40D21H13/50D21H15/02D21H17/57D21H21/56
CPCD21H13/08D21H13/16D21H13/24D21H13/26D21H13/40D21H13/50D21H15/02D21H17/57D21H21/56B29C51/08D21H15/06B29C70/086B29C70/28B29C70/465D21H13/06
Inventor M·朱瓦嫩T·海杰尔特J·柯拓佳A·哈若林
Owner TEKNOLOGIAN TUTKIMUSKESKUS VTT
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