Structural foam and manufacture thereof

一种泡沫体、孔结构的技术，应用在薄料处理、运输和包装等方向，能够解决高剪切强度、没有公开各向异性泡沫生产等问题

Inactive Publication Date: 2011-05-18
GURIT (UK) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

None of these documents disclose the production of anisotropic foams, or address the problem of producing foams with high shear strength, high stiffness, high compressive modulus, and high shear modulus

Method used

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  • Structural foam and manufacture thereof
  • Structural foam and manufacture thereof
  • Structural foam and manufacture thereof

Examples

Experimental program
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Embodiment 1

[0098] In this example, a foam stock was prepared of a styrene-acrylonitrile (SAN) polymer, similar to the polymer used to make the applicant's Corecell (registered trademark) structural foam. The billet also contained a blowing agent containing azobisisobutyronitrile (AZDN) and acetone. The blank is cut to a predetermined rectangular shape and size and placed in a mold which is placed in a hydraulic press, shaped and sized to determine the maximum horizontal width and length of the expanded foam formed from the blank in the mold size. In order to achieve the desired value of the anisotropy index, a confinement system is provided to prevent any growth in length and width of the billet sample as it is heated and expanded to form the expanded foam. These samples are placed in a hydraulic press at a given temperature for a period of time in order to achieve the desired expansion defined by the limits of the mold cavity.

[0099] In this embodiment, the mold does not limit the m...

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Abstract

The present invention discloses a method of manufacturing a foam body having an anisotropic cell structure, the method comprising the steps of: expanding a polymer at an elevated temperature to form an initial foam body; and cooling the initial foam body under a negative pressure. There is also provided a method of manufacturing a foam body having an anisotropic cell structure, the method comprising the steps of: (a) in a first expansion step, expanding a foamable polymer composition substantially isotropically to form an initial foam body having an isotropic cell structure; and (b) in a second expansion step, expanding the initial foam body anisotropically in a selected direction under a negative pressure which applies an expanding force in the selected direction to provide a final foam body having an anisotropic cell structure. Apparatus for the methods are also disclosed.

Description

technical field [0001] This invention relates to anisotropic structural foams and apparatus and methods for making such foams. Background technique [0002] Structural foam is used in composite sandwich panels where sheets of foam are sandwiched between opposing outer skins of the fiber composite to maximize the thickness and thus stiffness of the composite sandwich panel with minimal impact on the sandwich panel weight . A sandwich panel can be likened to a steel I-beam where the composite skin is used as the flange of the I-beam and the core material of the structural foam is used as the shear web of the I-beam. During bending, one skin of the sandwich panel is compressed and the other is stretched. This results in shear loading within the core material. Therefore, shear strength and stiffness are key properties to prevent excessive deformation of the core material and maintain structural integrity. [0003] A high compressive modulus can help protect against minor imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C44/56C08J9/00B29C44/58
CPCB29C2791/006B29C44/5627B29C44/3403B29C44/586B29C44/352B29K2105/04B29C44/083B29C44/3423B29C44/353Y10T428/26
Inventor 延·西马德埃里克·埃里克拉朗斯特丹尼尔·托马斯·琼斯
Owner GURIT (UK) LTD
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