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US 8,474,388 B2Granted
Two-sided single-needle understitch sewing technique
AssigneeEvonik Roehm GmbH
InventorAlexander Roth
Life of this patent
Estimating the term…
Abstract
Reinforcement of sandwich structures with aid of a reinforcing device. The outer layers of the sandwich structure may primarily include a fiber-plastic composite and the core material may include a rigid polymer foam.
Claims18
A reinforcing process for a sandwich structure, comprising:
- providing a core material of the sandwich structure including applying an outer layer of semi-finished textile material to a side of the core material, the semi-finished textile material being selected from the group consisting of polyamide fibers, polyester fibers, carbon fibers, glass fibers, nylon fibers, metal fibers, aramid fibers, and basalt fibers;
- introducing a through-hole in the core material of the sandwich structure;
- introducing a reinforcing structure at a time different from a time of introducing the through-hole;
- after the introducing the through-hole, fetching the reinforcing structure with aid of a hook, a gripper, or a needle, and introducing the reinforcing structure into the sandwich structure by an upward and turning movement of the hook, the gripper, or the needle, or by an upward movement of the hook, the gripper, or the needle secured to a slide;
- and
- after the introducing the through-hole and the subsequent introducing the reinforcing structure, leading the needle, the gripper, or the hook to a next insertion hole in a sewing direction, with or without the slide and without or with simultaneous turning, whereupon, with a next insertion, the reinforcing structure slides past the needle, the hook, or the gripper, and, after passing through the core material, the reinforcing material is taken up on an underside of the sandwich structure, the upward and turning movement of the gripper, the hook, or the needle or the upward movement of the gripper, the hook, or the needle secured to the slide causing entwining between an upper-lying portion of the reinforcing structure and an under-lying portion of the reinforcing structure.
3 more elements
A reinforcing process for a sandwich structure, comprising:
- providing a core material of the sandwich structure;
- introducing a through-hole in the core material of the sandwich structure;
- introducing a reinforcing structure including providing pins of a unidirectional fiber-plastic composite, an unreinforced plastic, or a metal, the introducing the reinforcing structure occurring at a time different from a time of introducing the through-hole;
- after the introducing the through-hole, fetching the reinforcing structure with aid of a hook, a gripper, or a needle, and introducing the reinforcing structure into the sandwich structure by an upward and turning movement of the hook, the gripper, or the needle, or by an upward movement of the hook, the gripper, or the needle secured to a slide;
- after the introducing the through-hole and the subsequent introducing the reinforcing structure, leading the needle, the gripper, or the hook to a next insertion hole in a sewing direction, with or without the slide and without or with simultaneous turning, whereupon, with a next insertion, the reinforcing structure slides past the needle, the hook, or the gripper, and, after passing through the core material, the reinforcing material is taken up on an underside of the sandwich structure, the upward and turning movement of the gripper, the hook, or the needle or the upward movement of the gripper, the hook, or the needle secured to the slide causing entwining between an upper-lying reinforcing structure and an under-lying reinforcing structure,
- wherein the introducing the reinforcing structure further includes providing textile reinforcing structures or rod-shaped elements.
3 more elements
A reinforcing process for a sandwich structure, comprising:
- providing outer layers of the sandwich structure including semi-finished textile materials;
- providing a core material of the sandwich structure including a polymeric core material, a natural core material, or a structured core material;
- introducing a through-hole in the core material of the sandwich structure;
- introducing a reinforcing structure at a time different from a time of introducing the through-hole;
- after the introducing the through-hole, fetching the reinforcing structure with aid of a hook, a gripper, or a needle, and introducing the reinforcing structure into the sandwich structure by an upward and turning movement of the hook, the gripper, or the needle, or by an upward movement of the hook, the gripper, or the needle secured to a slide;
- after the introducing the through-hole and the subsequent introducing the reinforcing structure, leading the needle, the gripper, or the hook to a next insertion hole in a sewing direction, with or without the slide and without or with simultaneous turning, whereupon, with a next insertion, the reinforcing structure slides past the needle, the hook, or the gripper, and, after passing through the core material, the reinforcing material is taken up on an underside of the sandwich structure, the upward and turning movement of the gripper, the hook, or the needle or the upward movement of the gripper, the hook, or the needle secured to the slide causing entwining between an upper-lying reinforcing structure and an under-lying reinforcing structure;
- and
- embedding the outer layers, the core material, and the reinforcing elements in a polymeric matrix material.
5 more elements
Dependencies are inferred from the claim text.