FOOD GRADE/SANITARY


With experience since 1945 in commercial and industrial mixing, Hayes & Stolz has acquired and developed the skills necessary to manufacture Horizontal Batch Mixers with the appropriate finish for the intended application. Single Shaft and Twin Shaft Mixers with either ribbon or paddle agitators can be designed and manufactured for food grade/sanitary applications.

Following are specifications from the "Hayes & Stolz Procedures for the Manufacture and Finishing of Stainless Steel Equipment" for standard stainless steel finishes. While these procedures address the standards adopted by Hayes & Stolz, they are not intended to limit our ability or willingness to provide a custom finish to a customer’s own specification.

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ULTRA-SANITARY STAINLESS STEEL (USSS):

Used primarily when sanitary construction is specified for food, chemical and pharmaceutical industries requiring stainless steel product contact, a finish with no cracks or crevices, and a high degree of interior polish. Interior is polished to 120 grit final finish.

Construction Materials
Stainless steel product contact surfaces (surfaces in direct contact with the material being processed or handled and/or exposed to material dust or residue).
Stainless steel externals except as noted or as determined and defined by the customer. Use only stainless or plated fasteners; no unfinished carbon steel (black) fasteners.
Welding
Product contact zone – Continuous TIG welds free of overlaps, cracks and surface pores.
Exterior – Continuous TIG welds free of overlaps, cracks and surface pores.
Finishes
Welds in the Product Contact Zone – Grind and polish welds smooth to 120 grit final finish.
Exterior Welds – Remove slag and weld “spatter”.
Surfaces in the Product Contact Zone – Grind all surface imperfections and manufacturing “scars” smooth and power tool polish to 120 grit final finish with a uniform “grained” appearance.
Exterior Surfaces – Exterior to be “sugar” blasted to a uniform finish.
Interior and exterior to be thoroughly cleaned prior to shipping to remove soil, fabrication debris and hand prints.
Paint
Exterior fabricated mild steel to be cleaned, masked and painted with Steel-It stainless topcoat over rust inhibitive primer.
Purchased components (bearings, reducers, motors, etc.) to be painted with Steel-It stainless topcoat over factory applied coatings.
Exposed mild steel shafts and unfinished mild steel components on motors, reducers, etc. shall be protected with FDA compliant rust-inhibitive coating (grease).
General
End Plate Design – U-Shaped end plate with legs and gusseted C-Shaped horizontal bearing brackets. Bearing to be mounted in suspension on brackets.
End Plate Attachment – Drive end plate to be bolted and interior seam sealed with small, continuous fusion weld at final assembly. Weld discoloration to be removed. Tail end plate to be welded.
Mixer Support – Square tubing legs mounted on the end plates. Locate so as not to interfere with discharge gate or take-away conveyor system. Discharge height to be specified.
Ribbon Shaft Assemblies - Cross arm collars to be eliminated. Cross arms to be continuously welded to the main shaft. Ribbon “wraps” or backing straps shall not be used. Ribbons to be continuously welded to the cross arms. Proper ribbon to tub wall clearance to be determined at assembly and the seal mounting plates welded-in-place to the end plates (non-adjustable).
Paddle Shaft Assemblies - Keyed and bolted cross arms shall be replaced with welded-in-place cross arms. Paddles to be continuously welded to the cross arms. Proper paddle to tub wall clearance to be determined at assembly and the seal mounting plates welded-in-place to the end plates (non-adjustable).
Drop bottom mixers do not meet the strict requirements for sanitary applications.
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SANITARY STAINLESS STEEL (SSS):

Used primarily when sanitary construction is specified for food, chemical and pharmaceutical industries requiring stainless steel product contact surfaces and a finish with no cracks or crevices, but not requiring the highest degree of interior polish. Interior is polished to 80 grit final finish.

Construction Materials
Stainless steel product contact surfaces (surfaces in direct contact with the material being processed or handled and/or exposed to material dust or residue).
Stainless steel externals except as noted or as determined and defined by the customer. Use only stainless or plated fasteners; no unfinished carbon steel (black) fasteners.
Welding
Product contact zone – Continuous TIG welds free of overlaps, cracks and surface pores.
Exterior – Continuous MIG welds free of overlaps, cracks and surface pores.
Finishes
Welds in the Product Contact Zone – Grind and polish welds to remove weld spatter and heavy ripple only and finish with 80 grit final media.
Exterior Welds – Remove slag and weld “spatter”.
Surfaces in the Product Contact Zone – Grind all surface imperfections and manufacturing “scars” smooth and power tool polish to 80 grit final finish with a uniform “grained” appearance.
Exterior Surfaces – Exterior to be “sugar” blasted to a uniform finish.
Interior and exterior to be thoroughly cleaned prior to shipping to remove soil, fabrication debris and hand prints.
Paint
Exterior fabricated mild steel to be cleaned, masked and painted with Steel-It stainless topcoat over rust inhibitive primer.
Purchased components (bearings, reducers, motors, etc.) to be painted with Steel-It stainless topcoat over factory applied coatings.
Exposed mild steel shafts and unfinished mild steel components on motors, reducers, etc. shall be protected with FDA compliant rust-inhibitive coating (grease).
General
End Plate Design – U-Shaped end plate with legs and gusseted C-Shaped horizontal bearing brackets. Bearing to be mounted in suspension on brackets.
End Plate Attachment – Drive end plate to be bolted and interior seam sealed with small, continuous fusion weld at final assembly. Weld discoloration to be removed. Tail end plate to be welded.
Mixer Support – Square tubing legs mounted on the end plates. Locate so as not to interfere with discharge gate or take-away conveyor system. Discharge height to be specified.
Ribbon Shaft Assemblies - Cross arm collars to be eliminated. Cross arms to be continuously welded to the main shaft. Ribbon “wraps” or backing straps shall not be used. Ribbons to be continuously welded to the cross arms. Proper ribbon to tub wall clearance to be determined at assembly and the seal mounting plates welded-in-place to the end plates (non-adjustable).
Paddle Shaft Assemblies - Keyed and bolted cross arms shall be replaced with welded-in-place cross arms. Paddles to be continuously welded to the cross arms. Proper paddle to tub wall clearance to be determined at assembly and the seal mounting plates welded-in-place to the end plates (non-adjustable).
Drop bottom mixers do not meet the strict requirements for sanitary applications.
More Information
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STAINLESS STEEL COMMERCIAL (SSC II):

Used primarily when “stainless steel construction” is specified. Commercial design shall be the same as for standard carbon steel units except as noted below. Interior and exterior commercial finish shall be as-fabricated. The exterior of SSC-II equipment will not be painted.

Construction Materials
Stainless steel product contact surfaces (surfaces in direct contact with the material being processed or handled and/or exposed to material dust or residue).
Stainless steel externals except as noted or as determined and defined by the customer. Use only stainless or plated fasteners; no unfinished carbon steel (black) fasteners.
Welding
Product contact zone – Continuous MIG weld.
Exterior – Continuous MIG weld (paying special attention to quality of weld considering that exterior will not be painted).
Finishes
Welds in the Product Contact Zone – Remove slag only.
Exterior Welds – Remove slag, weld spatter and discoloration. Special care shall be taken to avoid grinder and tool marks.
Surfaces in the Product Contact Zone – Mill finish, as-fabricated.
Exterior Surfaces – Mill finish as-fabricated and cleaned. Special care shall be taken to avoid grinder and tool marks.
Interior and exterior to be thoroughly cleaned prior to shipping to remove soil, fabrication debris and hand prints
Paint
External stainless steel is not painted. Exterior fabricated mild steel to be cleaned, masked and painted with polyurethane topcoat (standard color is SW Pillar White) over rust inhibitive primer.
Purchased components (bearings, reducers, motors, cylinders, solenoid valves, limit switches, etc.) to have factory applied coatings with no additional paint required unless factory finish has been scratched or damaged.
Exposed mild steel shafts and unfinished mild steel components on motors, reducers, etc. shall be protected with rust inhibitive coating (grease).
General
End Plate Design – U-Shaped end plate with legs and gusseted C-Shaped horizontal bearing brackets. Bearing to be mounted in suspension on brackets.
End Plate Attachment – Drive end plate to be bolted. Tail end plate to be bolted.
Mixer Support – Square tubing legs mounted on the end plates. Locate so as not to interfere with discharge gate or take-away conveyor system. Discharge height to be specified.
Ribbon Shaft Assemblies - Cross arm collars to be eliminated. Cross arms to be continuously welded to the main shaft. Ribbon “wraps” or backing straps shall not be used. Ribbons to be continuously welded to the cross arms. Seal mounting plates to be bolted and slotted to the end plates for adjustable tub wall clearence.
Paddle Shaft Assemblies - Keyed and bolted cross arms shall be standard commercial design of stainless steel materials. Paddles shall be bolted to slotted cross arms for adjustable tub wall clearence.
On drop bottom mixers, the extent of stainless steel in the door actuating zone shall be determined and defined. Any mild steel components in the door zone shall be primed or protected with rust inhibitive coating (grease).
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STAINLESS STEEL COMMERCIAL (SSC I):

Used primarily when “stainless steel product contact surfaces” is specified. Commercial design shall be the same as for standard carbon steel units except as noted. Interior and exterior commercial finish shall be as-fabricated. The exterior of SSC-I equipment will be painted.

Construction Materials
Stainless steel product contact surfaces (surfaces in direct contact with the material being processed or handled and/or exposed to material dust or residue).
Mild steel externals (stiffeners, brackets, supports, drive guards, etc.).
Welding
Product contact zone – Continuous MIG weld.
Exterior – MIG skip-weld with seams caulked between welds.
Finishes
Welds in the Product Contact Zone – Remove slag only.
Exterior Welds – Remove slag and prep for paint.
Surfaces in the Product Contact Zone – Mill finish, as-fabricated.
Exterior Surfaces – Mill finish as-fabricated and prep for paint.
Interior and exterior to be thoroughly cleaned prior to shipping to remove soil, fabrication debris and hand prints
Paint
Complete exterior to be cleaned and painted with industrial polyurethane topcoat (standard color is SW Pillar White) over rust inhibitive primer.
General
End Plate Design – (Same as standard mild steel) Full end plate with support feet and gusseted shelf type bearing brackets. The bearings mount on the tops of the brackets.
End Plate Attachment – Bolted on both ends. (Same as standard mild steel)
Mixer Support –Mixer shall be supported by the end plates – no legs. (Same as standard mild steel)
Ribbon Shaft Assemblies - Cross arm collars to be eliminated. Cross arms to be continuously welded to the main shaft. Ribbon “wraps” or backing straps shall not be used. Ribbons to be continuously welded to the cross arms. Seal mounting plates to be bolted and slotted to the end plates for adjustable tub wall clearance.
Paddle Shaft Assemblies - Keyed and bolted cross arms shall be standard commercial design of stainless steel materials. Paddles shall be bolted to slotted cross arms for adjustable tub wall clearance.
On drop bottom mixers, the extent of stainless steel in the door actuating zone shall be determined and defined. Any mild steel components in the door zone shall be primed or protected with rust inhibitive coating (grease).

More Information



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