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Vacuum Assisted Resin Transfer Molding


Patents with Abstracts


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Vacuum Assisted Resin Transfer Molding (VARTM)


4. 8,257,537 
Manufacturing device and manufacturing method of laminate
Shinoda and Nagaoka of Toray Industries, Japan, produced a laminate by vacuum assisted RTM.  The inter-layers of a laminate precursor are integrated with two or more reinforcing fiber base materials.  This includes a pressing and heating tool.  (RDC 9/10/2012)

3. 8,231,819 
Movable injection passages during the manufacturing of laminates
Jacobsen of LM Glasfiber A/S, Denmark, developed a method of manufacturing a laminate with the formation of underpressure between a mold and a vacuum foil and supply of resin from injection areas to the layers of the laminate situated in the mold.  The novel aspect according to the invention comprises movement of the injection areas while the resin is supplied, This is accomplished by use of a movable suction unit which is arranged on top of the vacuum foil and which, by means of an underpressure between the suction unit and the vacuum foil, forms injection areas for supply of the resin, which can be moved by moving the suction unit. The invention further relates to such movable suction unit and the use thereof in the manufacture of laminates. (RDC 8/7/2012)

2. 8,216,500 
Method of manufacturing pre-bent wind turbine blades
Olesen et al of LM Glasfiber A/S, Denmark, manufactured a blade shell half of a pre-bent wind turbine blade by means of vacuum-assisted resin transfer moulding (VARTM), a fibre lay-up is placed on a mould surface and a distribution layer is placed above the fibre lay-up.  At least one segmentation area is provided in the distribution layer by providing at least one transversely extending flow barrier in the distribution layer preventing or restricting longitudinal resin flow to the distribution layer.  A longitudinally extending first feed channel is placed above the distribution layer.  The first feed channel is divided into at least two feed channel sections, a feed channel section being arranged in each distribution layer segment. A vacuum bag is arranged on top of the mould part to define a mould cavity. The mould cavity is evacuated and liquid resin is supplied to each feed channel section through a resin inlet to fill the mould cavity and impregnate the fibre lay-up. (RDC 7/25/2012)

1. 8,128,396 
Reusable sealing device
Ross and  Buxman of Spirit AeroSystems, Kansas, developed a sealing device for forming an airtight seal between a first body, such as a cure tool, and a second body, such as a vacuum bag, without the use of adhesives.  The sealing device consists of an outer surface attached to the second body, an inner surface configured to face the first body, and two cusps located at opposite edges of the inner and outer surfaces.  The sealing device may form a continuous boundary around an area of any shape or size.  The sealing device may have a substantially crescent-shaped cross-section, allowing the sealing device to suction to the first body when compressed against the first body.  The sealing device may also consist of a tab protruding from the inner surface between the first and second cusp for providing a more secure seal between the sealing device and the first body. (RDC 4/17/2012)


Roger D. Corneliussen

Maro Polymer Links
Tel: 610 363 9920
Fax: 610 363 9921


Copyright 2012 by Roger D. Corneliussen.
No part of this transmission is to be duplicated in any manner or forwarded by electronic mail without the express written permission of Roger D. Corneliussen

* Date of latest addition; date of first entry is 4/17/2012.