Vacuum conveyors are used in production lines that require the transportation of powder and granules or the stable positioning of products during conveying and processing. Depending on the application, the equipment can be designed as a vacuum conveying system that transports materials through pipelines or as a perforated conveyor belt combined with a vacuum chamber. In this article, Belota explains the structure, working principle, common belt types, and how to select a suitable belt for your production needs.

What Is a Vacuum Conveyor?

A vacuum conveyor is a device that uses a pressure differential to transport materials or hold products in a fixed position on a production line. Depending on its design and intended application, the equipment generally falls into two categories: vacuum conveying systems that transport powder and granules through pipelines, and conveyor systems that use suction to hold workpieces on the belt surface.

Through enclosed conveying or precise workpiece holding, vacuum technology can help reduce dust dispersion, minimize product movement, and improve production automation. Equipment selection should be based on material characteristics, conveying or workpiece-holding requirements, required throughput, and actual operating conditions.

Structure and Working Principle of a Vacuum Conveyor

The structure and working principle of a vacuum conveyor depend on its intended application. The equipment may transport powder and granules through pipelines or hold products securely on a conveyor belt during processing.

Structure of a Vacuum Conveyor

A vacuum conveying system for bulk materials typically consists of the following components:

  • Vacuum pump: Creates a pressure differential to draw materials into the system.
  • Conveying pipeline: Transports materials from the feeding point to the receiving location.
  • Filter: Separates dust and prevents material particles from entering the vacuum pump.
  • Receiving hopper: Collects the material and separates it from the airflow.
  • Discharge valve and control system: Regulate material discharge and manage the operating cycle.

A vacuum belt conveyor designed to hold workpieces consists of a perforated conveyor belt, a vacuum chamber, a vacuum pump, and a control system. These components work together to generate suction, keeping products stable on the belt surface.

Working Principle

  • Material conveying: The vacuum pump reduces the pressure inside the system, generating airflow that carries powder or granules through the pipeline into the receiving hopper. The material is separated from the airflow and discharged for the next production stage.
  • Workpiece holding on the belt: The vacuum pump creates a lower pressure inside the chamber beneath the perforated belt. The resulting pressure differential generates a holding force that keeps the workpiece on the belt, reducing movement during conveying or processing.

Common Types of Vacuum Conveyor Belts

  • Perforated PVC conveyor belts: Cost-effective, with a flat surface and easy customization of hole patterns. They are suitable for holding paper, sheets, and lightweight products in printing and packaging lines.
  • Perforated PU conveyor belts: Offer good resistance to oils and fats, along with good durability. They are suitable for food-processing lines and environments requiring high hygiene standards when the selected material grade meets the relevant requirements.
  • NBR/PVC rubber conveyor belts: Provide good lateral rigidity and resistance to deformation, making them suitable for certain cotton suction machines and applications that require the belt to maintain its shape under negative pressure.

Key characteristics of vacuum conveyor belts:

  • Perforated surface: Allows airflow through the belt to generate suction and hold products securely.
  • High lateral rigidity: Helps prevent the belt from deforming or being pulled into the suction grooves under negative pressure.
  • Good airtightness: Minimizes air leakage and helps maintain effective suction.
  • Mechanical durability: Withstands tension, friction, and operating conditions.
  • Appropriate hole configuration: Hole diameter and spacing should match product dimensions and the required suction area.
  • Suitable surface properties: Provides adequate grip, reduces product slippage, and helps prevent damage to the conveyed items.

Advantages of Vacuum Conveyors

  • Reduced dust dispersion: Enclosed pipeline conveying helps reduce airborne dust, making it suitable for food, pharmaceutical, and chemical applications.
  • Stable product positioning: Vacuum belt conveyors help minimize workpiece movement during conveying, printing, and CNC machining, supporting greater processing accuracy.
  • Improved automation: The system can be integrated with machinery and production lines to support continuous material feeding or product positioning.
  • Flexible installation: Conveying pipelines can be routed to suit the factory layout, while vacuum belt conveyors are suitable for processes requiring products to remain securely positioned.
  • Improved hygiene control: An enclosed design and appropriate cleaning procedures can help reduce contamination risks, particularly in production environments with strict hygiene requirements.
  • Reduced manual handling: When integrated with an automated control system, the equipment can reduce manual material feeding and workpiece-holding tasks.

Disadvantages of Vacuum Conveyors

  • High initial investment: The system may require a vacuum pump, specialized pipelines or conveyor belts, and a control system.
  • Electricity consumption: The vacuum pump requires electrical power to maintain suction during operation.
  • Airtightness requirements: Leaks in pipelines or vacuum chambers can reduce conveying efficiency and workpiece-holding force.
  • Material limitations: Sticky or excessively moist materials may cause conveying problems, while porous products can reduce the effectiveness of vacuum holding.
  • Regular maintenance: Vacuum pumps, filters, seals, and connections require periodic inspection and cleaning.

Applications of Vacuum Conveyors

  • Food industry: Conveying flour, sugar, seasonings, and granular ingredients to mixers and packaging machines while helping reduce dust dispersion during material feeding.
  • Pharmaceutical and chemical industries: Feeding powder and granules into production processes while supporting dust control and reducing contamination risks when an appropriately designed enclosed system is used.
  • Plastics industry: Transporting plastic pellets from storage hoppers to injection molding or extrusion machines, helping automate material feeding.
  • Personal hygiene product manufacturing: Vacuum belt conveyors transport and hold layers of nonwoven fabric, PE backsheet film, liquid distribution layers, and absorbent materials in diaper production lines and sanitary pad manufacturing. Suction helps minimize material movement during cutting, layer bonding, and product forming.
  • Printing and packaging industries: Holding paper, cardboard, and film materials securely on the belt to reduce slippage during printing, cutting, and other processing operations.
  • CNC machining: Using vacuum suction to secure workpieces on a dedicated machine table or conveyor, supporting accurate cutting and machining.
  • Electronics industry: Using vacuum-holding mechanisms to position suitable components during assembly, inspection, or processing.

Key Considerations When Manufacturing Vacuum Conveyors

  • Assess material characteristics: Consider the dimensions, moisture content, weight, and air permeability of the materials or products being conveyed.
  • Select the appropriate conveyor belt: Ensure adequate durability and abrasion resistance, with a perforation pattern suited to the product dimensions.
  • Calculate the required suction force: Select the vacuum pump capacity, airflow rate, and suction area according to operating requirements.
  • Ensure airtightness: Inspect seals, joints, pipelines, and vacuum chambers to minimize air leakage.
  • Allow for easy cleaning and maintenance: Choose a design suited to the operating environment, particularly in food, pharmaceutical, diaper, and sanitary pad manufacturing.

Belota Supplies Quality Vacuum Conveyor Belts

Belota supplies conveyor belts and customized conveyor solutions for production lines that require material conveying or stable product positioning. Depending on the application, Belota can advise on PVC, PU, or rubber belt materials suited to product characteristics and operating conditions.

For custom vacuum conveyor belt fabrication, customers can provide dimensions, technical drawings, or information about the existing machine. Belota can then assist in determining a suitable belt type, perforation pattern, and relevant technical requirements.

With experience in conveyor belts and industrial power transmission components, Belota focuses on practical solutions tailored to actual production needs, helping customers with belt installation and replacement.

Conclusion

Vacuum conveyors support a range of production requirements, from transporting powder and granules to holding products securely on a belt during processing. To achieve reliable performance, businesses should select the appropriate belt material, perforation pattern, and vacuum system based on material characteristics and operating conditions. Belota provides consultation on conveyor belts and customized fabrication solutions to help businesses identify an option suited to their production lines.