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A conveyor belt module for inserting a high-density array of rollers comprises a bottom heavy spine forming a portion of a module body and gusset blocks reinforcing an intersection between the spine and hinge elements. The conveyor belt module includes hinge elements spaced apart by five different s

A conveyor belt module for inserting a high-density array of rollers comprises a bottom heavy spine forming a portion of a module body and gusset blocks reinforcing an intersection between the spine and hinge elements. The conveyor belt module includes hinge elements spaced apart by five different separation distances to allow a high-density array of rollers mounted on a hinge rod in spaces formed between the hinge elements and interlaced hinge elements of an adjacent conveyor belt module in a modular plastic conveyor belt formed by a plurality of interlaced conveyor belt modules.

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1. A conveyor belt module comprising: a module body comprising a laterally-extending spine having a top surface forming part of a top conveying surface, an opposite bottom surface, a front surface and a rear surface, wherein the laterally-extending spine is bottom heavy, with a bottom portion of the

1. A conveyor belt module comprising: a module body comprising a laterally-extending spine having a top surface forming part of a top conveying surface, an opposite bottom surface, a front surface and a rear surface, wherein the laterally-extending spine is bottom heavy, with a bottom portion of the spine thicker in a longitudinal direction than a top portion;a first set of hinge elements spaced apart across first gaps and extending longitudinally forward from the front surface; anda second set of hinge elements spaced apart across second gaps and extending longitudinally rearward from the rear surface. 2. The conveyor belt module of claim 1, wherein the spine has a top portion having a substantially consistent thickness and a bottom portion that flares out. 3. The conveyor belt module of claim 1, wherein the front surface has a substantially straight upper portion that transitions at an inflection point to a concave curve in a lower portion. 4. The conveyor belt module of claim 3, wherein the rear surface has a substantially straight upper portion that transitions at an inflection point to a concave curve in a lower portion. 5. The conveyor belt modules of claim 3, wherein the inflection point is centered between the top surface and the bottom surface. 6. The conveyor belt module of claim 1, further comprising a gusset block at an intersection between a first hinge element and the spine. 7. The conveyor belt module of claim 1, wherein the module body further comprises a corrugated portion in a non-roller region. 8. The conveyor belt module of claim 1, wherein the first set of hinge elements have three different separation distances and the second set of hinge elements have three different separation distance, at least one separation distance in the first set of hinge elements different from the separation distances in the second set of hinge elements. 9. The conveyor belt module of claim 3, wherein the inflection point aligns with vertical centers of the hinge elements. 10. A conveyor belt module comprising: a module body extending in thickness from a top surface forming part of a conveying surface to an opposite bottom surface and longitudinally from a front surface to a rear surface;a first hinge element extending longitudinally forward from the front surface;a second hinge element extending longitudinally rearward from the rear surface and offset laterally from the first hinge element; anda first gusset block for the module body formed at an intersection between the module body and the first hinge element, the gusset block having a longitudinally outward surface that intersects a side surface of the first hinge element and a side surface that intersects the front surface of the module body, the top surface of the gusset block, module body and hinge elements all in same plane to form the conveying surface. 11. The conveyor belt module of claim 10, further comprising a second gusset block formed at an intersection between the module body and the second hinge element. 12. The conveyor belt module of claim 10, wherein the longitudinally outward surface is vertical and perpendicular to a longitudinal direction and the side surface is vertical and parallel to the longitudinal direction. 13. The conveyor belt module of claim 12, wherein the vertical outward surface extends beyond the front surface. 14. The conveyor belt module of claim 12, wherein the vertical side surface aligns with a side surface of the second hinge element. 15. The conveyor belt module of claim 10, wherein the module body comprises a laterally-extending spine that is bottom heavy. 16. A conveyor belt comprising: a first module comprising a module body, a first set of hinge elements extending in a first direction from a first end of the module body and a second set of hinge elements extending in a second direction from a second end of the module body;a second module hingedly connected to the first module, the second module comprising a module body, a third set of hinge elements extending in the first direction from a first end of the module body and a fourth set of hinge elements extending in the second direction from a second end of the module body, the fourth set of hinge elements interlaced with the first set of hinge elements to form a hinge passageway;a hinge rod inserted in the hinge passageway to hingedly connect the first module to the second module; anda plurality of rollers mounted on the hinge rod in spaces formed between the fourth set of hinge elements and the first set of hinge elements, the plurality of rollers comprising a first side roller adjacent to a first side of the module bodies, a first set of evenly spaced rollers spaced from the first side roller by a first separation distance, a second set of evenly spaced rollers spaced from the first set of evenly spaced rollers by the first separation distance, a third set of evenly spaced rollers spaced from the second set of evenly spaced rollers by the first separation distance and a second side roller adjacent to a second side of the module bodies and separated from the third set of evenly spaced rollers by the first separation distance, wherein each of the first set of evenly spaced rollers, the second set of evenly spaced rollers and the third set of evenly spaced rollers comprises a plurality of rollers separated from each other by a second separation distance that is smaller than the first separation distance. 17. The conveyor belt of claim 16, wherein each module body comprises a laterally-extending spine that is bottom heavy. 18. The conveyor belt of claim 16, further comprising a plurality of gusset blocks at selected intersections between a hinge element and the module body. 19. A conveyor belt module comprising: a module body extending in thickness from a top surface to a bottom surface and longitudinally in a direction of belt travel from a first end to a second end;a first hinge element extending forward from the first end;a second hinge element extending forward from the first end and spaced from the first hinge element by a first space that laterally spans a first distance;a third hinge element extending forward from the first end and spaced from the second hinge element by a second space that laterally spans a second distance that is smaller than the first distance, the second hinge element between the first hinge element and third hinge element;a fourth hinge element extending forward from the first end and separated from the first hinge element by a third space that laterally spans a third distance that is smaller than the second distance;a fifth hinge element extending rearward from the second end;a sixth hinge element extending rearward from the second end and spaced from the fifth hinge element by a fourth space that laterally spans a fourth separation distance that is larger than the first separation distance;a seventh hinge element extending rearward from the second end, the seventh hinge element spaced from the fifth hinge element by a fifth space having a lateral width equal to the first separation distance; andan eighth hinge element extending rearward from module body and separated from the seventh hinge element by a sixth space that laterally spans a fifth separation distance that is between the second separation distance and the third separation distance. 20. The conveyor belt module of claim 19, wherein the module body is bottom heavy. 21. The conveyor belt module of claim 19, further comprising a plurality of gusset blocks at selected intersections between the second, third, fifth or sixth hinge element and the module body. 22. A conveyor belt module comprising: a module body having a top surface, a bottom surface, a front surface and a rear surface,a first element extending forward from the front surface;a second hinge element spaced apart from the first hinge element by a first space and extending forward from the front surface, the first space being asymmetrical about a line extending halfway between the first hinge element and the second hinge element, the asymmetry caused by a gusset block having a longitudinally outward surface intersecting the first hinge element and a side surface that intersects the front surface of the module body. 23. The conveyor belt module of claim 22, wherein the module body is bottom heavy. 24. A conveyor belt module comprising: a module body comprising a laterally-extending spine having a top conveying surface, an opposite bottom surface, a front surface having an upper portion that is substantially vertical and straight, wherein the front surface inflects at a front inflection point to flare out in a bottom portion, and a rear surface having an upper portion that is substantially vertical and straight, wherein the rear surface inflect at a rear inflection point to flare out in the bottom portion,a first set of hinge elements spaced apart across first gaps and extending forward from the front surface; anda second set of hinge elements spaced apart across second gaps and extending rearward from the rear surface, wherein the front and rear inflection points align with vertical centers of the hinge elements.