Boat and method for manufacturing using resin transfer molding
View Patent ↗One aspect of the present invention relates to a method for making a boat. The boat includes a port side positioned opposite from a starboard side. The boat also includes a floor and stingers supports positioned within the hull. The method includes providing a insert having two spaced-apart elongated portions interconnected by at least two spaced-apart transverse portions that extend between the elongated portions. The elongated portions are sized and relatively positioned for one of the elongated portions to extend along the port side of the hull and the other of the elongated portions to extend along the starboard side of the hull. The method also includes positioning the insert in a chamber defined between a male mold piece and a female mold piece. The method further includes providing fibrous reinforcing material that surrounds the insert within the chamber. The fibrous reinforcing material includes portions positioned between the male mold piece and the insert, and also includes portions positioned between the female mold piece and the insert. The method further includes transferring resin into the chamber between the male and female mold pieces such that the resin envelops the fibrous reinforcing material, and curing the resin within the chamber. As the resin cures, the resin enveloped fibrous reinforcing material hardens to form the hull, the floor and the support stringers of the boat.
1. A method for molding an article having an upper portion, a lower portion, and an insert located between the upper portion and the lower portion, wherein the article is molded as a single, unitary piece with no seams or discontinuities located between the upper portion and the lower portion, the method comprising:
arranging in a spaced apart opposed relationship a first mold section comprising a first semi-rigid membrane removably mounted to a first rigid housing to define a first fluid tight chamber therein and a second mold section comprising a second semi-rigid membrane removably mounted to a second rigid housing to define a second fluid tight chamber therein;
defining a mold plenum between the first and second semi-rigid membranes when the first and second mold sections are closed together to mold the article;
filling the first and second fluid tight chambers with a substantially non-compressible backing fluid to support each membrane during injection of resin;
positioning the insert in the mold plenum defined between the first and second semi-rigid membranes;
providing fibrous reinforcing material that surrounds the insert within the mold plenum, the fibrous reinforcing material including portions positioned between the first semi-rigid membrane and the insert, the fibrous reinforcing material also including portions positioned between the second semi-rigid membrane and the insert, each of the fibrous reinforcing material portions positioned between the first and second semi-rigid membranes and the insert being in contact with the insert;
closing the first and second mold sections towards each other to sandwich the fibrous reinforcement material around the insert;
retaining the first and second mold sections together;
injecting resin under pressure into the mold plenum such that the resin envelops the fibrous reinforcing material and the insert;
distributing a resulting injection pressure by the backing fluid; and
curing the resin by heating at least one of the backing fluid to produce the molded article.
2. The method of claim 1 , wherein the molded article is a boat.
3. The method of claim 1 , wherein the insert includes a buoyant material.
4. The method of claim 3 , wherein the buoyant material includes foam.
5. The method of claim 1 , wherein the insert includes an elongated portion including a top surface and a side surface, an upper surface of the article being formed by portions of the resin enveloped fibrous reinforcing material that cover the top surface of the insert and an elongate support structure of the article being formed by portions of the resin enveloped fibrous reinforcing material that cover the side surface of the insert.
6. The method of claim 1 , further comprising providing a finish layer within the first mold section to form a finished outer coat on an exterior surface of the upper portion of the article.
7. The method of claim 5 , further comprising providing a finish layer along the second mold section to form a finished outer coat on an exterior surface of the lower portion of the article.
8. The method of claim 6 , wherein the finish layer includes gel coat.
9. A molded article comprising:
a lower portion having a length between a front and a rear of the molded article, the lower portion having a width between a rightmost side and a leftmost side of the molded article, the lower portion being made of a fiber reinforced resin construction, the lower portion defining a first outermost surface of the molded article;
an upper portion connected to the lower portion by a seamless connection extending along a majority of the length and the width of the lower portion such that there are no discontinuities located between the upper portion and the lower portion, the upper portion being made of a fiber reinforced resin construction, the upper portion defining a second outermost surface of the molded article; and
at least one foam insert forming at least a portion of a reinforcement structure extending substantially the entire distance between the first outermost surface and the second outermost surface of the molded article, wherein the entirety of the at least one foam insert is positioned at a location between the rightmost side and the leftmost side of the molded article such that no portion the at least one foam insert is located adjacent either the rightmost side or the leftmost side of the molded article.
10. A molded article according to claim 9 , wherein the molded article is a boat.
11. A molded article according to claim 9 , wherein the lower portion defines a hull of the boat and the upper portion defines an upper platform or a floor of the boat.
12. A molded article according to claim 9 , wherein the at least one foam insert extends substantially the entire distance between the first outermost surface and the second outermost surface of the molded article.