Spiroflow

Spiroflow specializes in providing bulk material handling solutions, particularly for industries such as food, chemical, and pharmaceutical. They are well-known for their innovative conveying systems, including flexible screw conveyors and pneumatic conveying systems, which help streamline production processes.

FAQ:

What types of bulk materials can a Spiroflow flexible screw conveyor handle?

Spiroflow flexible screw conveyors are designed to move a wide range of bulk materials, including powders, granules, flakes, pellets, and fibrous materials. This versatility comes from the availability of multiple screw profile options. Round wire screws work well for free-flowing materials, flat wire screws are better suited for materials that tend to pack or compress, and specialty profiles exist for particularly challenging materials with unusual flowability, abrasiveness, or fragility characteristics.

The conveyor's enclosed tube design also makes it suitable for materials that are dusty, hygroscopic, or otherwise sensitive to the environment. Because there are no internal bearings or seals inside the tube itself, the risk of contamination from lubrication is eliminated, which is a significant factor when conveying food ingredients, pharmaceutical powders, or fine chemicals. Buyers sourcing used Spiroflow units should confirm which screw profile is included with the machine and whether it matches the material they intend to run.

What industries commonly use Spiroflow flexible screw conveyors?

Spiroflow flexible screw conveyors have a strong presence in the food processing, pharmaceutical, chemical, and plastics industries. In food production, they are used to move ingredients like flour, sugar, spices, protein powders, and granulated additives. The pharmaceutical industry relies on them for conveying active ingredients, excipients, and blended powders where contamination control and cleanability are critical. Chemical and plastics manufacturers use them for pellets, resins, and powdered additives.

Beyond those core sectors, flexible screw conveyors from Spiroflow also appear in agricultural processing, nutraceuticals, and cosmetics manufacturing. The common thread across all these applications is the need to move dry bulk materials reliably without excessive product degradation or contamination risk. When evaluating a used unit, it is worth asking about the previous application, since a conveyor that handled food-grade materials will likely be in a different condition than one used in an abrasive chemical environment, and this affects both cleanliness and wear on the screw and tube.

How does a flexible screw conveyor work?

A flexible screw conveyor moves bulk material by rotating a helical screw inside a flexible tube. The screw, driven by a motor at one end, generates a combination of rotational and centrifugal forces that push material along the tube from the inlet to the discharge point. Because the screw itself is flexible and the outer tube is made from a pliable material (typically polyethylene or similar), the entire conveyor can be routed around obstacles, bent at angles, or configured for vertical lifts without requiring a rigid straight-line path.

One of the defining characteristics of this design is its mechanical simplicity. There are no internal bearings, seals, or moving parts inside the tube other than the screw itself. This reduces the number of components that can fail and makes the system easier to disassemble for cleaning. The motor and drive assembly sit outside the tube at the upper end, keeping them away from the product stream. For buyers considering a used unit, this simplicity also means that assessing the condition of the machine is more straightforward compared to more complex conveyor types, since wear is concentrated primarily on the screw and the inner surface of the tube.

What are the advantages of a flexible screw conveyor compared to other conveyor types?

The biggest practical advantage of a flexible screw conveyor is its ability to route around obstacles and change direction without a series of separate conveyor sections or transfer points. A single unit can move material from a floor-level hopper up to a mezzanine-level process vessel at an angle, something that would require multiple pieces of equipment with a belt or chain conveyor. This flexibility in routing reduces the overall equipment footprint and the number of potential failure points in a production line.

From a maintenance standpoint, the absence of internal bearings and seals is a meaningful benefit. Other conveyor types, like drag chain or screw-in-trough conveyors, have internal components that require regular lubrication and are difficult to access for cleaning. Flexible screw conveyors can typically be disassembled quickly by withdrawing the screw from the tube, making sanitation much faster. For operations running multiple products through the same line, this cleaning advantage translates directly into reduced changeover time. These characteristics hold true for used units as well, provided the screw and tube are in good condition.

Are Spiroflow flexible screw conveyors suitable for food-grade and pharmaceutical applications?

Spiroflow has a long history of supplying flexible screw conveyors to food and pharmaceutical manufacturers, and many of their units are built with materials and finishes that meet the requirements of those regulated industries. Stainless steel screws and stainless steel contact surfaces are standard offerings for sanitary applications, and the enclosed tube design prevents external contamination of the product stream. The lack of internal lubrication points inside the tube is a particular advantage in food and pharma environments where lubricant contamination is a serious concern.

For buyers purchasing a used Spiroflow flexible screw conveyor intended for food or pharmaceutical use, it is important to verify the materials of construction before assuming the unit meets current regulatory requirements. A unit previously used in a chemical plant may have the same basic design but different material specifications than one built for food processing. Requesting documentation on the original build specifications, or consulting with Spiroflow directly about a specific model and serial number, can help clarify whether the unit is appropriate for a regulated application. Visual inspection of the screw, tube, and inlet and discharge components is also essential to assess the current sanitary condition.

Can a Spiroflow flexible screw conveyor handle fragile or friable materials without causing excessive breakage?

Flexible screw conveyors are generally considered gentler on fragile materials than pneumatic conveying systems, which use high air velocities that can cause significant particle attrition and breakage. The relatively slow rotational speed of the screw and the absence of high-velocity impact points make flexible screw conveyors a reasonable choice for granules, flakes, and other materials that cannot tolerate aggressive handling. Spiroflow offers different screw profiles specifically to optimize performance for materials with varying degrees of fragility.

That said, no conveyor is entirely without effect on product integrity, and the degree of degradation depends on the specific material, the screw speed, the tube diameter, and the conveyor length. Materials that are extremely brittle or have a very low tolerance for attrition may still experience some breakage. Buyers sourcing a used unit for a fragile material application should pay close attention to the screw profile included with the machine and consider whether it is appropriate for their product. If possible, consulting with the manufacturer about the suitability of a specific screw type for a given material is a worthwhile step before finalizing a purchase.

What should buyers look for when inspecting a used Spiroflow flexible screw conveyor?

The most critical components to evaluate on a used flexible screw conveyor are the screw itself and the inner surface of the flexible tube. The screw should be inspected for wear, distortion, or corrosion along its full length. A worn or bent screw will not convey material efficiently and may cause the tube to wear prematurely. The tube should be checked for cracks, abrasion, or deformation, particularly at bends and at the inlet and discharge connections where stress concentrates. Stainless steel components should be examined for pitting or discoloration that might indicate prior exposure to corrosive materials.

The drive motor and gearbox are also worth careful attention. Buyers should ask whether the motor runs and whether any unusual noise or vibration is present during operation. Reputable used equipment dealers will typically accommodate in-person or video inspections so buyers can assess these details before committing to a purchase. Some units may still be installed and operational at the facility where they were used, which provides an opportunity to observe the machine running under real conditions. Keep in mind that most dealers do not have the ability to test conveyors with actual product, so buyers should factor that limitation into their evaluation process.

What are the typical tube diameters and configurations available for Spiroflow flexible screw conveyors?

Spiroflow flexible screw conveyors are available in a range of tube diameters, commonly from around 2 inches up to 6 inches or larger, depending on the model and the intended throughput. Smaller diameter tubes are suited to lower-capacity applications and finer materials, while larger diameters handle higher volumes and coarser products. The length of the conveyor can vary considerably as well, with units designed for short transfers of a few feet and others built for runs of 20 feet or more. The Spiroflow Orthos model, for example, is one specific configuration available in the used market, with stainless steel screw construction and lengths such as 12 feet being common.

Because the used market offers whatever configurations happen to be available at a given time, buyers should have a clear understanding of their required tube diameter, length, inlet and discharge heights, and throughput needs before searching for a unit. A conveyor that is too small in diameter will underperform, and one that is significantly oversized may run inefficiently or cause product degradation from excessive screw speed relative to the material volume. Discussing specific requirements with a used equipment dealer who specializes in bulk material handling equipment can help narrow down which available units are a practical match for a given application.

What does the shipping and delivery process look like for a used Spiroflow flexible screw conveyor?

Shipping a used flexible screw conveyor involves more logistical planning than smaller equipment purchases. The conveyor tube, screw, drive assembly, and any associated hopper or support structure need to be properly packaged to prevent damage in transit. Depending on the length and configuration of the unit, this may require a custom-built crate or heavy-duty palletization. Buyers should ask the dealer specifically what packaging will be used and whether that cost is included in the quoted price or billed separately, since crating costs for industrial equipment can be meaningful.

For larger or heavier units, loading at the dealer's facility and unloading at the destination may require a forklift or crane, and rigging costs are typically an added expense. Freight charges will vary based on the size and weight of the shipment and the distance involved. Buyers should request a complete breakdown of all costs, including packaging, rigging, and freight, to understand the full landed cost of the equipment before making a purchasing decision. Most used equipment dealers require full payment prior to shipping, so having financing or funds in place before finalizing the purchase is important.

How should buyers approach purchasing a used Spiroflow flexible screw conveyor without a warranty?

Used industrial equipment is typically sold as-is, meaning the buyer assumes responsibility for assessing the condition of the machine before purchase. This places real importance on the inspection process. Buyers should take advantage of any inspection opportunity offered by the dealer, whether in person, via live video, or through detailed photo and video documentation of the machine. Paying close attention to wear items like the screw and tube, as well as the drive motor and gearbox, gives a much clearer picture of what the machine will need before it can be put back into service.

Selecting a dealer with a demonstrated track record in bulk material handling or process equipment is another important factor. Dealers who specialize in a specific industry tend to have a better understanding of what to look for when acquiring equipment and are more likely to represent the condition of a machine accurately. It is also worth contacting Spiroflow directly to ask about parts availability and technical support for the specific model and age of the unit being considered. Older models may have limited parts availability, which affects the long-term serviceability of the machine and should be factored into the purchase decision.