Title: Building a lamination of fiberglass reinforced polyester resin on a rotating mandrel

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Claims: We claim:

1. A process for building a fiberglass reinforced polyester lamination on a spirally rotating mandrel comprising:

depositing an unsaturated polyester resin on the surface of the rotating mandrel,

depositing pieces of chopped fiberglass onto the surface of the polyester resin

impressing the chopped fiberglass into the resin by the pressure of a plurality of strands that run substantially parallel to the path of a point on the surface of the rotating mandrel and

said rotating mandrel having longitudinal movement along the axis of rotation in such a manner that a point on the mandrel surface passes under the resin, fiberglass and strand applications several times.

2. In a process for building a lamination of unsaturated polyester resin and fiberglass on a spirally rotating mandrel, the improvement comprising the steps of

pouring a continuous stream of said resin from a substantially horizontal surface onto the top of said rotating mandrel,

depositing pieces of chopped fiberglass on the resin,

impressing the chopped fiberglass into the resin by force of a plurality of strands that run substantially parallel to the path of a point on the surface of the rotating mandrel and

said rotating mandrel having longitudinal movement along the axis of rotation in such a manner that a point on the mandrel surface passes under the resin, fiberglass and strand applications several times.

3. The process of claim 2 wherein said resin is poured from a box mounted above the mandrel, said box having a bottom which is said horizontal surface, three closed sides and an open side, through which open side the resin passes onto the top of the rotating mandrel.

4. The process of claim 2 wherein the pieces of chopped fiberglass have a length of about 1 to about 25 cm.

5. The process of claim 2 wherein spacing between the parallel strands is about 0.2 to about 0.6 times the length of the piece of chopped fiberglass.

Other info:

Inventors: Leroux, Pierre J. (Angleur, BE)
DE Schilde, D. van de Werve (Angleur, BE)

Application Number: 325826
Filing Date: 1973-01-22
Publication_date: 1976-03-30
Assignee: The Standard Oil Company (Cleveland, OH)
Primary Class(es): 156/62.4 156/173, 156/431
Other Classes:
US Patent Ref:

2614058	Oct, 1952	Francis	156/175.
2656873	Oct, 1953	Stephens	156/175.
2927623	Mar, 1960	Huisman et al.	156/200.
3379591	Apr, 1968	Bradley	156/173.
3464879	Sep, 1969	Poulsen	156/429.
3655468	Apr, 1972	Bastone et al.	156/62.
3716431	Feb, 1973	Townsend et al.	156/62.

Other Refs:
Primary Examiner: Fritsch, Daniel J.
Assistant Examiner:
Attorney: Knudsen; Herbert D.