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Two-sided single-needle under-thread stitching process

A needle guide, sandwich structure technology, applied in the direction of high-efficiency propulsion technology, air transportation, application, etc., can solve problems such as expanding sewing threads, and achieve the effect of eliminating the cutting process to length

Inactive Publication Date: 2009-04-29
EVONIK ROEHM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reason for this is that the diameter of the core hole cannot be kept stable with the increasing number of stitches and the number of sewing threads introduced, because the diameter of the core hole is roughly enlarged by the amount of the cross-sectional area of ​​the sewing thread due to the additional introduction of the sewing thread

Method used

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  • Two-sided single-needle under-thread stitching process
  • Two-sided single-needle under-thread stitching process

Examples

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Embodiment Construction

[0031] A hook, clip or needle (clamping system) 1 together with reinforcing material 3 such as sewing thread or roving can be used to reinforce the sandwich structure (Fig. I).

[0032]The hook, clip or needle 1 together with the reinforcing material 3 is guided to the next piercing point during a simultaneous 180° swivel movement (Figures I and II). If the hook, needle or clip is fixed to a slider, the rotational movement may be foregone.

[0033] Hooks, clips, needles 1 are used to introduce a through hole into the core material 2 or if necessary through one or more skin and core materials (Figure III). At this time, the reinforcing material is not carried. The reinforcing material slides past the hooks, pins or clips (Fig. IV) and remains on the upper surface of the core material.

[0034] Needles, hooks or clips take the reinforcement from below, which is then introduced into the sandwich structure by an upward and rotational movement (Fig. IV). If the hook, needle or c...

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Abstract

The invention relates to a method for enhancing an interlayer structure. The surface layer of the interlayer structure can be made of fibre-plastic compound materials (FKV) preferably, and the core layer material is made of polymeric rigid foams.

Description

technical field [0001] The invention relates to a reinforcement method for sandwich structures, characterized in that the introduction of through-holes in the core material is carried out temporally separately from the introduction of the reinforcement structure. [0002] The invention is suitable for reinforcement of sandwich structures. The sandwich structure may preferably comprise: fiber plastic composite layers with skins made of textile semi-finished products (such as fabrics, scrims, felts, etc.); a core material (such as polymer foam); a polymer Matrix material (thermoplastic or thermoset). Sandwich structures are structures formed layer by layer, and they consist of relatively thin upper and lower skin layers and a relatively thick core layer with low bulk density. [0003] According to the present invention, utilize the reinforcing element that passes through along the thickness direction, just can obviously improve the lateral characteristic of sandwich structure ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B7/08B32B5/24B32B5/26B32B5/28B63B5/24B64C1/00E04C2/26B29C70/00
CPCY02T50/43Y02T50/433B29C70/24B29C70/086B32B7/08B32B5/28B29C70/545B32B5/245B32B2250/40B32B2262/0261B32B2262/0269B32B2262/0276B32B2262/101B32B2262/103B32B2262/106B32B2479/00B32B2605/00Y10T428/24033Y02T50/40
Inventor A·罗特
Owner EVONIK ROEHM GMBH
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