Abstract: The problems caused by chemical and thermal shrinkage of hard roll covers, are reduced by the inclusion of one or more intermediate compressive layers between the metal roll substrate and the outer cover, or cover. A compressive layer has the properties of being rigid enough to allow the cover to be applied to the roll, and compressible enough to deform and absorb the stresses which occur as the cover is shrinking during processing.In one embodiment, the intermediate compressive layer comprises a three dimensional fabric that is filled preferably with a thermoset resin system which cures at lower temperature than cover. In a second embodiment, the precise amount of shrinkage in the roll is predetermined to a high enough degree of accuracy so that a depth for the fabric layer can be used to compensate for the amount of shrinkage, thereby eliminating the need for filling. In a third embodiment, the compressive layer is comprised of a meltable material wherein said material melts at cure temperatures.

Abstract: An improved method for forming plastic molds for casting articles having an optical surface such as contact lenses employs a plastic tool having an optically smooth surface.

Abstract: A method and apparatus for fabricating columns, wherein the apparatus includes a column fabricating assembly and a column extractor. The column fabricating assembly includes a unitary column mold and a mold support assembly. The unitary column mold is reusable and is fabricated specially for the task of fabricating a column therein. Uncured column materials are placed into the unitary column mold and the unitary column mold is enclosed in the mold support assembly. The uncured column materials cure, and thus the column is formed, while the unitary column mold is encased in and spun by the mold support assembly. The unitary column mold is removed from the mold support assembly with the column therein. The column extractor is used to extract the column from the unitary column mold; the unitary column mold is secured by the column extractor and the column extractor pulls the column out of the unitary column mold.

Abstract: A method for preparing mimics of a wide variety of drugs and other biologlly active molecules using molecular imprinting techniques, and the mimics produced thereby, is disclosed. Specifically, the mimic is designed by: (i) polymerization of functional monomers around a known drug or biologically active molecule (the template) that exhibits a desired activity; (ii) removal of the template molecule; and then (iii) polymerization of a second class of monomers in the void left by the template, to provide a new organic molecule which exhibits one or more desired properties which are similar to that of the template.

Abstract: A method of manufacturing boat hulls in a female mould. The hull includes a rigid reinforced plastic shell and at least one softer protective layer which is made from a plastic or rubber material and located on the outside of the shell. To provide the hull with a smoother outer surface and an improved adhesion between the shell and the layer, the layer is integrated in the hull when the hull is manufactured, by first applying the layer on the mould surface of the female mould and then building the structural shell on the layer and on free parts of the mould surface. The protective layer is accurately manufactured if it is cast moulded in a cast mould and if the female mould, or any other object that has been used when developing the female mould, is used for the cast moulding.

Abstract: A method of forming a fine ceramics structure having columns with a fine pattern of width and a high aspect ratio includes steps of charging a plastic mold with a ceramics slurry, solidifying the ceramics slurry, and thereafter removing the plastic mold. The plastic mold is removed by heating the plastic mold in a vacuum, employing laser ablation, employing plasma etching, or employing a solvent of low viscosity dissolving plastic mold. Especially, the plastic mold is made of acrylic, the ceramics structure is made of lead zirconate titanate, and the mold is removed by laser ablation. The resulting fine pattern ceramics structure may have columns with an aspect ratio of at least 10, and particularly a height of 100 .mu.m and a diameter of 10 .mu.m.

Abstract: An implantable bone prosthesis, such as an acetabular shell, includes a bone engaging region that is made from a cast metal or metal alloy and an articulation surface that is formed of a ceramic material or a metal that is permanently attached to the metal bone engaging region. The bone engaging region of the prosthesis preferably includes a dampening mechanism to absorb some of the loading forces communicated to the acetabular cavity. The bone prosthesis is formed by a casting process from casting molds that are prepared using a three dimensional printing technique.

Abstract: An improved metal working tool or die having an outer surface formed from synthetic resin material that is filled with a hardener. The outer surface is formed of a material that consists of a synthetic resin mixed with tabular alumina and a surface treating agent such as gamma-Methacryloxypropyltrimethoxysilane. The tool or die is formed over a pattern by applying the outer hard surface layer to the pattern and then a second or intermediate layer of synthetic resin that is filled with calcium silicate. A third layer of material that includes a reinforcing fiber such as fiber glass is applied over the intermediate layer.

Abstract: The problems caused by chemical and thermal shrinkage of hard roll covers, are reduced by the inclusion of one or more intermediate compressive layers between the metal roll and the outer cover, or topstock. A compressive layer has the properties of being rigid enough to allow the topstock to be applied to the roll, and compressible enough to buffer and absorb the stresses which occur as the topstock is shrinking during processing.In one embodiment, the intermediate compressive layer comprises a three dimensional fabric that is filled preferably with a thermoset resin system which cures at lower temperature than topstock. In a second embodiment, the precise amount of shrinkage in the roll can be predetermined to a high enough degree of accuracy so that a depth for the fabric layer can be used to compensate for the amount of shrinkage, thereby eliminating the need for filling. In a third embodiment, the compressive layer is comprised of a wax material.

Abstract: A method for manufacturing rubber molds using a mold making apparatus having first and second discs of rubber mold material with models of articles to be cast positioned therebetween includes a bottom plate having a centrally located portion which engages the first sheet of rubber mold material and an outer reduced thickness flange, and a top plate which overlies the bottom plate. The top plate has a centrally located portion which engages the second sheet of rubber mold material and an outer reduced thickness flange corresponding to the flange of the bottom plate when disposed over the bottom plate. A plurality of thumb turn members are provided for tightening the top plate towards the bottom plate by hand. The arrangement is such that the models disposed between the first and second discs of rubber mold material form mold cavities therein.

Abstract: A method for consolidating powdered material to near net shape and full density is provided. The method includes the steps of: mixing a particulate material with an organic or inorganic binder to form a mold material; shaping the mold material into a mold having a shape and including an external surface and an interior cavity and being of sufficient solidity to maintain its shape yet being compressible under pressure; filling the interior cavity with a powdered material to be consolidated; heating the mold with the powdered material therein to form a heated filled mold; applying pressure to the external surface of the mold sufficient to compress the mold material and transfer a pressurizing force to the powdered material within the mold cavity so as to consolidate the powder and form an article; and removing the article from the mold. In an alternative method, the mold material is made of a particulate material which is held in the shape of the mold by a vacuum.

Abstract: A process for making a casting mold or core utilizes a refractory composition including a slurry of yttria, an acid and an organic solvent. The composition is applied to a mold or pattern, dried, and fired to produce a mold or a layer of a mold or core. The articles produced are relatively unreactive with titanium and titanium alloys during casting.

Abstract: A method for spray forming manufacturing of near-net-shape molds, dies and related toolings, wherein liquid material such as molten metal, metallic alloys, or polymers are atomized into fine droplets by a high temperature, high velocity gas and deposited onto a pattern. Quenching of the atomized droplets provides a heat sink, thereby allowing undercooled and partially solidified droplets to be formed in-flight. Composites can be formed by combining the atomized droplets with solid particles such as whiskers or fibers.

Abstract: A method for making a mottled and patterned pen barrel is disclosed, wherein a tube is preformed to have two ends and an intermediate portion, At least one mold cavity is provided in a mold for forming the pen barrel. A pair of positioning members are sleeved respectively around two ends of the tube, and the positioning members are positioned in the mold cavity so as to center the tube in the mold cavity and so as to create, in the mold cavity, a molding space surrounding an entire peripheral surface of the intermediate portion. A liquid coating composition is poured into the molding space to form a cover integral with the entire peripheral surface of the intermediate portion. Finally, the covered tube is removed from the mold cavity and the positioning members are removed from the covered tube.

Abstract: A method and apparatus for the manufacture of lens molds used in the formation of optical contact lenses, the apparatus including a center gate aligned on the central axis of the lens mold cavity for delivery of the melt polymer in an axisymmetrical manner. The methodology produces lens molds of extremely precise dimensions as measured against lens molds produced with side gated technology.

Abstract: A binder composition for binding a water-insoluble particulate material, such as sand, in the manufacture of a foundry mold or core comprises a mixture of (1) an inorganic binder consisting of an aqueous solution containing polyphosphate chains and/or borate ions and (2) a water-soluble surfactant. The inclusion of a water-soluble surfactant improves the flowability of foundry molding compositions.

Abstract: An apparatus for molding polystyrene mold halves which are used, for subsequent molding of a soft contact lens. The apparatus is designed with superior heat conduction capacity so as to minimize the molding cycle time, while simultaneously producing uniformly precise and accurate optical quality surfaces. Molten polystyrene is provided via a hot runner system to a plurality of mold cavities. In a specific variation, the convex surface provides the optical quality surface to the concave surface of the mold half produced thereby. The structural element which defines the convex surface includes a hollow cylindrical bushing and a removable power insert mounted therein, which may be changed so that the prescription strength of the contact lens to be formed by the mold may be varied. In a first embodiment, the power insert includes only a convex surface at its operational end.

Abstract: A vinyl ester resin/filler composite is disclosed which has a glass transition temperature of at least 315.degree. C. when cured. One version of the composite includes tabular alumina as a filler. Another version of the composite includes a powdered base nickel alloy as a filler. The composite is especially advantageous when used to build tools for use in plastic molding machines and processes.

Abstract: A method for fabricating a composite structure such as an aircraft radome includes preparing seamless female support mold/caul plate tooling, and seamless male support mold/vacuum bag tooling. An uncured composite structure is collated on the external surface of the male support mold/vacuum bag tooling, and then transferred to the female support mold/caul plate tooling for curing. The female support mold/caul plate tooling defines the outer surface of the final composite structure, permitting the outer surface of be smooth and of an aerodynamic shape.

Abstract: A retroreflective article comprising a transparent base sheet having first and second broad faces, the second face being substantially planar and the first face having an array of substantially hemi-spheroidal microlenses thereon, the microlenses being wider and shorter than portions of true spheres, the shape of the microlenses and thickness of the base sheet being such that collimated light substantially orthogonally incident to the array is focused approximately at the second face, wherein the second face has a coating of a nacreous pigment composition thereon. The article can include an optional layer of adhesive over the reflective layer to permit the article to be adhered to a document as a tamper-indicating, authenticating, and protective overlay. Special images can be formed within the article to enhance the security provided thereby. Also, a method for making such base sheets, and a method for making a forming master.

Abstract: A method and apparatus for fabricating columns, wherein the apparatus includes a column fabricating assembly and a column extractor. The column fabricating assembly includes a unitary column mold and a mold support assembly. The unitary column mold is reusable and is fabricated specially for the task of fabricating a column therein. Uncured column materials are placed into the unitary column mold and the unitary column mold is enclosed in the mold support assembly. The uncured column materials cure, and thus the column is formed, while the unitary column mold is encased in and spun by the mold support assembly. The unitary column mold is removed from the mold support assembly with the column therein. The column extractor is used to extract the column from the unitary column mold; the unitary column mold is secured by the column extractor and the column extractor pulls the column out of the unitary column mold.

Abstract: A method of fabricating a wax casting of a golf club iron head including the steps of providing a wax injection tool having a rear cavity projection; providing a collapsible insert that is shaped to provide a desired undercut peripheral region in the rear cavity of the wax casting; installing the collapsible insert on the periphery of the rear cavity projection of the tool; injecting hot wax into the tool and allowing the wax to harden; then removing the hardened wax and insert from the injection tool; and finally removing the insert as a unitary member from the hardened wax, without requiring any form of breakage of the wax casting or the insert such as by distorting its shape.

Abstract: A method of manufacturing a multi-holed plate made of a composite material wherein a molding resin is filled, with a resin membrane being applied inbetween, in the previously prepared holes of a raw forming element of the composite material and the raw forming element of the composite material is hardened by heat and pressure.

Abstract: A mold in accordance with the present invention can be formed by a method which utilizes a fiber reinforced pre-ceramic resin composite which is cured and fired to form a Continuous Fiber Ceramic Composite (CFCC), or alternatively by use of a pre-ceramic matrix composite, which is cured, but not fired into a ceramic state.

Abstract: The invention relates to a water based binder for use in a slurry for investment casting. The binder includes a mixture of a colloidal silica sol and at least one latex polymer. The latex polymer is preferably an acrylic latex or a styrene butadiene polymer (or a combination of these) which reduces the processing time between dips during shell mold making for investment casting. The latex polymer further lowers a critical concentration point or gelation point of the colloidal silica sol. The binder may be used as a primary binder or a backup binder in the shell mold making process. To make the slurry, the binder is combined with at least one refractory powder, preferably a refractory powder selected from the group of: aluminosilicates, fused silica, quartz silica, alumina, zircon, and zirconia.

Abstract: A moldable composition suitable for use as a pattern core material for investment casting. The composition comprises a water-soluble continuous phase organic material and a water-soluble fluorescing dye dispersed through the continuous phase organic material. Related disposable thermoplastic patterns and methods are also disclosed.

Abstract: An vacuum bag for forming of a fiber reinforced composite article, made of a curable elastomer, having molded in resin distribution means. Optional vacuum conduits are molded into the periphery of the bag, causing the bag to be adapted to any number of mold shapes. The bag contains a resin distribution conduit sealed into the vacuum bag. A multiplicity of cross channels are formed on the inner surface of the bag, covering most of the area under which the fiber lay up is placed within the mold. These cross channels can be formed from a pattern of multiple, variegated small dots or pentagons, which, under vacuum, leave a multiplicity of small crisscross channels running along the inner surface of the vacuum bag. This pattern of distribution channels covers most of the fiber lay up, except for a perimeter area which insures resin flow into rather than across the fiber lay up.

Abstract: The problems caused by chemical and thermal shrinkage of hard roll covers, are reduced by the inclusion of one or more intermediate compressive layers between the metal roll and the outer cover, or "topstock". A compressive layer has the properties of being rigid enough to allow the cover to be applied to the roll, and compressible enough to buffer and absorb the stresses which occur as the cover is shrinking during processing.In one embodiment, the intermediate compressive layer comprises a three dimensional fabric that is filled preferably with a thermoset resin system which cures at lower temperature than cover. In a second embodiment, the precise amount of shrinkage in the roll can be predetermined to a high enough degree of accuracy so that a depth for the fabric layer can be used to compensate for the amount of shrinkage, thereby eliminating the need for filling. In a third embodiment, the compressive layer is comprised of a wax material.

Abstract: An apparatus for making a mold for forming positive models identical to a positive master has upper and lower mold shells having confronting and contiguous rims lying in respective planes. The shells are dimensioned when juxtaposed to spacedly contain the master. A clamp is engageable with the shells generally at the rims to hold the shells together with the plane of their rims spaced apart.

Abstract: A method for manufacturing, in a resin transfer molding process, a fiber-reinforced polymer object having an exterior surface with first and second portions, the method comprising the steps of providing a first mold with an inner surface, placing dry reinforcement material on the first mold inner surface, providing a second mold including at least one flexible portion with an inner surface having the shape of the object first exterior surface portion, and the second mold also including at least one rigid portion with an inner surface having the shape of the object second exterior surface portion, placing the second mold over the dry reinforcement material to define a space between the first mold inner surface and the inner surfaces of the flexible and rigid portions, reducing the pressure, relative to ambient pressure, in the space between the molds, injecting resin into the space, and curing the resin.

Abstract: A method of making a mold from a model is disclosed. A mold carrier is formed having an aperture therein. The aperture has a configuration generally corresponding to the shape of the model. The model is positioned within the aperture such that a space is created between the outer peripheral surface of the aperture and the outer peripheral surface of the model. A resilient first material in its liquid state is poured into the space such that the first material substantially covers the outer peripheral surface of the model. The resilient first material is allowed to solidify in the space such that a resilient mold insert is formed. The mold insert forms an impression of the outer peripheral surface of the model and is disposed along the inner peripheral surface of the aperture. The model is removed from the resilient mold insert. A second material in its liquid state is poured into the aperture of the mold carrier with the resilient mold insert disposed along the inner peripheral surface of the aperture.

Abstract: This invention relates to a continuous flow process of mold making or die making using a reusable bondable mixture substance to make selected finished products.

Abstract: An apparatus for producing a fissured, acoustical ceiling panel wherein the pins used to fissure the panel are roll applied thereto. The pins are embedded in flexible, resilient polymeric plates, and a plurality of the plates are attached to a rotary drum which is used to apply the fissuring pins to the surface of the panel. The invention also includes the method for manufacturing the polymeric plates which are molded and formed with the fissuring pins embedded therein.

Abstract: An arrangement for molding a front or back polystyrene mold half which is used, with a second complementary back or front mold half, for subsequent molding of a soft contact lens such as a hydrogel soft contact lens. Each mold half defines a convex curved surface and a concave curved surface spaced therefrom, with one of the surfaces defining an optical quality curved surface for the soft contact lens. A heated molding machine introduces molten polystyrene through a hot runner system to a plurality of mold cavities, each of which defines an optical quality curved surface and also a second noncritical surface. The optical quality surface of the mold cavity is positioned further away from the heated hot runner side of the mold than the second surface, which allows faster cooling of the optical quality surface of the mold cavity. Each mold cavity has a first insert on the optical quality side of the mold cavity and a second insert on the second side.

Abstract: In order to manufacture low-weight, large-scale, artificial rocks resistant to weathering and faithfully rendered as in nature, first a malleable plastic reproduction is made of a natural-rock object. If called for, the reproduction is braced in a second method step, preferably by coating its back side with glass-fiber reinforced plastic. The work mold so manufactured receives a parting compound in a third operational step and thereupon preferably fiberglass mats are inserted and a coat of synthetic resin is applied to make a positive in the shape of a hollow artificial-rock blank. This artificial-rock blank is coated in a fourth operational step with a synthetic resin and fine-grain, preferably multicolored natural sand is deposited on or incorporated into the still moist coat of synthetic resin. Once this coat of synthetic resin with its incorporated natural sand has hardened, the artificial rock has been completed.

Abstract: A method of making microstructure bodies of plastic material. A microstructured plate-like base body which is made by any known molding procedure and which has a first side serving as a first reference plane and a second side which has plastic microstructures projecting therefrom is covered at its second side with a material layer that engages the microstructures, whereupon the material layer is machined to provide a second reference surface parallel to the first reference surface and the base body is then machined parallel to the second reference surface to expose the microstructures projecting therefrom and the material layer is finally removed selectively with respect to the plastic material to release the microstructured bodies.

Abstract: Disclosed are mold halves useful in molding a contact lens by polymerization of a polymerizable composition disposed between the mold halves. The mold halves are of rigid thermoplastic, preferably polystyrene, transparent to ultraviolet light.

Abstract: A method for making tubular members, each of which is coated with a decorative layer that has a randomly distributed chip pattern, includes the steps of: (A) preparing tube products, each of which having two ends and an intermediate portion between the two ends; (B) preparing a mold having a plurality of mold cavities; (C) sleeving detachably a pair of positioning members around the two ends of each of the tube products for enclosing and centering the two ends, and placing each of the tube products and the positioning members associated therewith in a respective one of the mold cavities; (D) forming a covering around the intermediate portion of each of the tube products by filling each of the mold cavities with a coating composition containing chips; (E) removing each of the covered tube products and the positioning members associated therewith from the mold, and detaching the positioning members from each of the covered tube products; and (F) machining and polishing the covered tube products, and cutting off

Abstract: A method for manufacturing a boat hull having an outer surface and including fiber-reinforced polymer and a plurality of stringers embedded in the fiber-reinforced polymer so that the fiber-reinforced polymer and the stringers define an inner surface of the boat hull, the method comprising the steps of providing a female mold with a periphery and an inner surface having the shape of the hull outer surface, placing dry reinforcement material on the mold inner surface, placing stringers on the dry reinforcement material, the stringers having additional dry reinforcement material thereon, providing a male mold with a periphery and an inner surface having the shape of the hull inner surface, placing the male mold over the stringers and the dry reinforcement material to define a space between the male mold and the female mold, sealing the peripheries of the male mold and the female mold, drawing a vacuum in the space between the male mold and the female mold, injecting resin into the space, and curing the resin.

Abstract: A method and apparatus for making a hollow tool which is used to impart shape to an article. The method comprises: (a) building an outer box around a model of the article; (b) constructing an inner box disposed within and spaced apart from the outer box; (c) applying a fluid laminating agent to an inside surface of the inner box and to the model; (d) removing the inner box after the fluid laminating agent cures to form a solidified shell; (e) supporting the shell so that a space is formed between it and the model; (f) pouring a filling agent into the space, the filling agent bonding to the shell and forming a face that replicates the model; and (g) installing a support structure inside the shell to form the hollow tool, thereby imbuing the tool with the physical characteristics of lightness in weight and durability in shape retention after prolonged exposure to thermal cycling and the thermal characteristics of a uniform heat conductivity over all sections of the tool, regardless of its outside dimensions.

Abstract: A durable reusable polymeric mold for casting a microstructure sheet having an array of prism elements and a method for forming the microstructure sheet are disclosed. A polymeric mold has a facet side and a base side including an array of prism elements upon which an radiation cured sheet can be formed. A protective surface layer can be formed on the facet side of the polymeric mold. The protective surface layer is sufficiently opaque to radiation to protect the polymeric mold from damage when the curable sheet is formed and is sufficiently bonded to the polymeric mold to allow the cured sheet to be removed from the protective surface layer while not substantially removing the protective surface layer from the polymeric mold. The microstructure sheet can be used as a retroreflective structure.

Abstract: A method of replicating surface textures by providing a laminar, dimensionally stable, flexible mold having an impression of the surface texture to be formed on one side thereof, applying a layer of fluid casting material to the flexible mold, and partially curing the resinous material wherein the impression is transferred to the partially cured resinous material. The flexible mold and layer of partially cured resinous material are then secured to a recipient surface, and the material is fully cured, and the flexible mold removed, leaving a surface texture on the recipient surface.

Abstract: A method for producing a prototype of an article includes generating a data file utilizing a computer aided design apparatus to provide data representing all of the geometry and contours for the inner cavity of the mold required to mold the article, using the data file to create the mold as a physical object directly from photosensitive resin utilizing a stereolithographic apparatus whereby the mold which is created utilizing the stereolithographic apparatus has a mold cavity having the geometry and contours required to blow mold the prototype of the article, positioning the mold in the blow molding apparatus, introducing a preform into the mold; and expanding the preform against the surface of the inner cavity of the mold to produce the prototype of the article.

Abstract: A three-dimensional electroformed shell for a mold consists of a three-dimensional thin-walled body, and an electroformed coating deposited on it. The coating may, or may not close the base holes of the thin-walled body completely. If it does not close the base holes completely, the shell has a multiplicity of apertures. A process for manufacturing the shell is also disclosed.

Abstract: Making a tire mold by spraying molten atomized metal on a model to form a metal shell and then reinforcing the shell with a resin backing to form a mold segment for the tire mold. Modular shoe container assemblies have replaceable backing members for making different size molds and flat plate spacers for providing different thicknesses of the mold segment. In one embodiment a slide block is used for one side of the cavity whereby a sole plate is eliminated.

Abstract: In order to manufacture low-weight, large-scale, artificial rocks resistant to weathering and faithfully rendered as in nature, first a malleable plastic reproduction is made of a natural-rock object. If called for, the reproduction is braced in a second method step, preferably by coating its back side with glass-fiber reinforced plastic. The work mold so manufactured receives a parting compound in a third operational step and thereupon preferably fiberglass mats are inserted and a coat of synthetic resin is applied to make a positive in the shape of a hollow artificial-rock blank. This artificial-rock blank is coated in a fourth operational step with a synthetic resin and fine-grain, preferably multicolored natural sand is deposited on or incorporated into the still moist coat of synthetic resin. Once this coat of synthetic resin with its incorporated natural sand has hardened, the artificial rock has been completed.

Abstract: A method of making a concave aspheric mold insert by electroplating nickel over a silver release agent coating on an aspheric surface formed in a copper substrate to form a master having a convex surface which is a negative image of the aspheric surface. After the master has been separated from the substrate its convex surface is coated with a silver release agent and electroplated with nickel to form an element having a concave surface which is a replication of the aspheric surface and the opposite surface of which is convex. After the convex surface of the element has been trued to spherical shape, a slightly oversize spherical D-seg is formed in the aspheric surface. The aspheric surface is then trued to reduce the D-seg to final size to produce the insert. A number of elements are formed from the master and are provided with D-segs of different radii.

Abstract: An vacuum bag for forming of a fiber reinforced composite article, made of a curable elastomer, having molded in resin distribution means. Optional vacuum conduits are molded into the periphery of the bag, causing the bag to be adapted to any number of mold shapes. The bag contains a resin distribution conduit sealed into the vacuum bag. A multiplicity of cross channels are formed on the inner surface of the bag, covering most of the area under which the fiber lay up is placed within the mold. These cross channels can be formed from a pattern of multiple, variegated small dots or pentagons, which, under vacuum, leave a multiplicity of small crisscross channels running along the inner surface of the vacuum bag. This pattern of distribution channels covers most of the fiber lay up, except for a perimeter area which insures resin flow into rather than across the fiber lay up.

Abstract: A method for manufacturing a boat hull having an outer surface and including fiber-reinforced polymer and a plurality of stringers embedded in the fiber-reinforced polymer so that the fiber-reinforced polymer and the stringers define an inner surface of the boat hull, the method comprising the steps of providing a female mold with a periphery and an inner surface having the shape of the hull outer surface, placing dry reinforcement material on the mold inner surface, placing stringers on the dry reinforcement material, the stringers having additional dry reinforcement material thereon, providing a male mold with a periphery and an inner surface having the shape of the hull inner surface, placing the male mold over the stringers and the dry reinforcement material to define a space between the male mold and the female mold, sealing the peripheries of the male mold and the female mold, drawing a vacuum in the space between the male mold and the female mold, injecting resin into the space, and curing the resin.

Abstract: For the manufacture of quickly drying dip coats whose drying time is comparable to the drying time of shells produced on the basis of alcoholic binders, the process uses as a binder for the dip a dispersion of aqueous colloidal silica sol to which synthetic high polymers and/or an emulsion from the group of silicon-organic compounds is formed which after drying is impermeable to water but permeable to water vapor.