Techno Conveyor Indonesia

Sanitation Issue: Metal v.s. Plastic

modular plastic construction eliminates “black speck”

INSIGHT

Sanitation Issue

DirectDrive Structure Supported spirals help simplify your sanitation procedures and safeguard the hygienic integrity of your product.

KEY ACCUMULATION AND LINE LAYOUT EQUATIONS

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DirectDrive Structure Supported spirals help simplify your sanitation procedures and safeguard the hygienic integrity of your product. The belt has no catchpoints and is designed for easy release, minimizing the risk of trapped or stuck product. Combined with its design and increased open area, this ensures that washdowns are quick, thorough, and predictable. The belt’s modular plastic construction eliminates the risk of “black speck” (discolored metal wear debris) and protects against foreign material contaminants.

Insights

The Truth About Spiral Belt Sanitation

Which material is easier to clean: metal or plastic?

Spiral conveyors are uniquely positioned along food processing lines. In our view, this is an area of the plant where food safety efforts and automation technologies converge. 

If your facility has spirals, you understand the advantages they bring to an operation. With the right equipment and belting, spiral systems allow processors to condition various food products efficiently in a small footprint.

The downside? If these mission-critical conveyors have a problem or go down completely, it could affect your entire production line.

Cleanability is key. To maintain food safety and optimal operating conditions, spiral owners must be sure that critical system components, such as belting, can be thoroughly sanitized.

But even though modular plastic belting is widely used in spiral conveyors, some food processors claim that metal belting is easier to clean. Is that the case?

To find the truth, we set out to determine:

When applied in spiral conveyor systems, can plastic belt material be cleaned as effectively as metal belt material?

Anthony Saitta, a Food Safety Specialist with Commercial Food Sanitation, conducted an in-depth study to compare the cleanability of metal (stainless steel) belting to plastic (acetal) belting for spirals. 

“It was important to approach this scientifically,” says Saitta. “Although regulatory standards are becoming more stringent, there have been multiple recalls in recent history. Understanding the facts regarding effective sanitation is crucial so that all of us can achieve our food safety goals.”

The cleaning studies were conducted in a state-of-the-art conditioning control center. This allowed Saitta to replicate the exact operational and environmental conditions commonly used in spiral freezing and cooling applications.

Method

In this study, potato hash and ground beef were applied individually to the belts. These soil types were selected based on their makeup, the processing conditions they undergo, and the prevalence of spiral freezer systems in the vegetable and meat industries. 

Spiral environmental temperature was lowered to approximately -10°F (-23.3°C) and the soils had a dwell time of about three hours. Next, the system underwent a thawing process where the temperature was raised to approximately 45°F (7.2°C).

Both the metal and plastic belt materials were cleaned using clean-in-place (CIP) spray bars. The process included pre-rinse, chemical application, and post-rinse steps for two revolutions each. Belt velocity was set to approximately 30 ft/min (9.1 m/min). Spray bar setup, water temperatures, drive pump adjustments, and chemicals used were implemented to meet common industry recommendations.

A post-sanitation inspection was conducted to look for physical, chemical, and biological residue. This was followed by a clean equipment swabbing process to determine the presence or absence of microbiological residue.

Findings

Residue

After cleaning, no visible residue was observed on the Intralox® modular plastic belt. However, each soil type left observable residue on the metal belt material. The forms consisted of either pieces of food or oily surface residue that remained on and between the metal belt material after cleaning.

Design

Belt design and construction contribute to cleanability. Metal belts have several, tight niche areas and catchpoints where food was found after cleaning. Additionally, even after detergent application and final rinse with high-pressure spray nozzles, oily residue remained on some of the thin, round surface areas of the metal belts.

  • Intralox Team Tip:

    In choosing a spiral belt, consider more than just material. There are clear differences in how the design and engineering of modular plastic belting stacks up against metal belting.

Counts

Most aerobic plate count results were in the acceptable range for both metal and plastic belt materials, though slightly higher counts were observed on the metal belt material.