Abstract: This invention increases the yield of output shrimp meat produced by roller type peeler apparatus, and achieves this without any substantial decreases in throughout quantity. The yield increase is achieved by means of critical interacting operating relationships in the peeling action between power rollers, intermediate rollers and insert rollers, expressed in terms of relative roller diameters. Preferred sets of rollers are identified that significantly increase the yields of cold water Pandalus species of shrimp in sizes of 90/kg to 350/kg over conventional commercial rollers. Surprisingly, the high throughput quantity of the peelers is not seriously compromised and may be even increased by the ability to provide more peeling channels in a conventional size peeling tray by replacement with smaller diameter power rollers. The preferred roller sets for use in current standard commercial equipment, without other changes, has lower power rollers of 2.5 inch (6.

Abstract: Improved machinery and methods for peeling raw, warm-water shrimp to solve the prior problems of scarring the shrimp meat and removing an excess of the edible meat. It has been found that a critical nip angle of between about 21.degree. and 33.degree., produced by an insert nip-forming roller having a smaller diameter than conventionally used in the prior art, considerably improves shrimp appearance while increasing the yield of shrimp meat. Attention is also given to the length and surface configuration of the insert rollers. With at least three axially aligned insert sections, better roller support prevents bowing and lengthens life. Selection of different axially disposed surface configurations permits special-purpose treatment of shrimp. For example, initial removal of waste is expedited by knurled surface sections, and final treatment by smoother sections prevents disfiguration of the peeled shrimp meat.

Abstract: Apparatus for centrifugally extracting meat from crab bodies is disclosed. The apparatus comprises a housing (10) for supporting a rotating drive means (32). A crab body holding means (26) is supported along a spin axis so as to restrain crab body sections in a selected orientation against a support structure (116). The selected orientation is such that when the holding means (26) spins around the spin axis, centrifugal forces on the crab bodies extracts the crab meats through openings in the shell structure. As the meat is propelled from the holding means (26) it is collected by the receiving compartment (30). The support structure (116) contacts and supports the crab body during the spinning of the crab body at specific locations of the crab shell structure to provide the minimum amount of obstruction to the meat being extracted while at the same time minimizing breaking and collapse of the shell structure. Further included is a braking means (34) for stopping the spinning of crab body holding means (26).

Abstract: Apparatus for more efficiently pre-cooking and peeling cold water shrimp such as the species Pandalus borealis is disclosed. The apparatus includes a conveyor for moving the shell-on or unpeeled shrimp up and out of a feeder tank. A perforated horizontal conveyor then carries the shrimp over a steam manifold with a multiplicity of apertures such that steam escapes from the manifold and rises through the perforated belt and surrounds the shrimp.A cooking chamber which completely encloses the horizontal conveyor except at the bottom, contains the lighter-than-air steam such that the raw shell-on shrimp are at least partially cooked by the surrounding steam. Since the lighter-than-air steam excludes all air from the cooking chamber, less oxidation of fats occurs and consequently a higher quality product is obtained.

Abstract: Apparatus and method for preparing cooked crabs for further processing to separate meat from shell by centrifugal action is disclosed. The apparatus comprises a holding means (28), cooperating with a clamping means (190, 192) for securing a crab body (30) to a conveying means (20). The conveying means (20) moves the crab body (30) which has had the carapace shell removed along a predetermined path to a cutting means such as for example circular blades (50A-50D). The circular blades are supported and driven such that as the crab body is moved into the blades by conveying means (20), these blades make a "V" cross-sectional shape cut extending betwee the front and rear of the crab. The open or top of the "V" shape is located at the top or back of the crab and the "tip" of the "V" extends into the crab body such that the "tip" is proximate to but does not cut through the belly shell of the crab. Thus, a "V" cross-sectional portion (116) containing the viscera of the crab is removed from the crab body.

Abstract: Apparatus for more efficiently pre-cooking and peeling cold water shrimp such as the species Pandalus borealis is disclosed. The apparatus includes a conveyor for moving the shell-on or unpeeled shrimp up and out of a feeder tank. A perforated horizontal conveyor then carries the shrimp over a steam manifold with a multiplicity of apertures such that steam escapes from the manifold and rises through the perforated belt and surrounds the shrimp.A cooking chamber which completely encloses the horizontal conveyor except at the bottom, contains the lighter-than-air steam such that the raw shell-on shrimp are at least partially cooked by the surrounding steam. Since the lighter-than-air steam excludes all air from the cooking chamber, less oxidation of fats occurs and consequently a higher quality product is obtained.