Established in 1984 Shawpak Systems prides itself on providing high level technical sales and support to our valued customer base. Offering solutions for Product Inspection, Packaging and Hygiene equipment sales and after sales support including certified customer training on site or at our Centre of Excellence training and demonstration facility.

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Checkweigher Equipment

Checkweigher equipment is an automated system that verifies product weight during production and packaging to ensure compliance with labeling claims and regulatory standards. Shawpak Systems Ltd, based in Oakville, Ontario, supplies and supports checkweighing solutions alongside our full range of packaging and hygiene equipment for food processing, manufacturing, and pharmaceutical facilities across North America.

If your facility handles packaged goods-whether meat, dairy, pharmaceuticals, or general manufacturing-understanding how these machines work, what they measure, and how they integrate with your production line is essential for both regulatory compliance and operational efficiency. Below are five critical considerations that plant managers and operations directors should evaluate before selecting a system.

1. How Checkweigher Systems Detect and Reject Non-Compliant Products

These machines use precision load cells or conveyor-based weighing to measure each package as it passes through the production line. When a product falls outside the acceptable weight range you set, the system triggers an automatic rejection mechanism-typically a pneumatic pusher or diverter arm-that removes the item from the main line into a collection area or secondary processing zone.

Because the rejection happens in real time, you catch compliance issues before products reach packaging, labeling, or shipping. This prevents costly recalls, regulatory fines, and damage to your brand reputation. Most systems can process between 60 and 300 packages per minute, depending on product size and line speed, so the technology integrates seamlessly into existing production workflows without creating bottlenecks.

2. Weight Range Settings and Regulatory Compliance Requirements

Regulatory bodies in Canada and the United States require that packaged goods meet declared weight specifications. The acceptable range typically allows a small margin below the labeled weight-usually 1 to 3 percent-but zero tolerance for consistent underfill. You set upper and lower weight thresholds in the machine's control panel based on your product specification and local regulations.

Most systems allow you to program multiple weight ranges if you run different products on the same line. The ability to store and recall preset recipes for each SKU saves time during changeovers and reduces operator error. Shawpak Systems provides technical advisory services to help you establish these parameters correctly, ensuring your facility meets federal and provincial standards without unnecessary product waste.

3. Integration with Existing Production Line Infrastructure

Checkweighers must fit physically and operationally into your current layout. They come as standalone units that sit on existing conveyor systems, or as inline models built directly into your line. The decision depends on your available space, current line configuration, and whether you plan to upgrade your entire packaging area simultaneously.

Connection to upstream equipment-such as filling machines or shrink wrapping systems-allows real-time communication that stops the line if rejects pile up, preventing manual bottlenecks. Data integration with your packaging or manufacturing software gives you traceability: every weight measurement can be logged, timestamped, and linked to a batch or production run. This audit trail is invaluable during inspections by regulatory agencies or for internal quality investigations. Shawpak Systems handles installation and configuration so your equipment works together as one system, not as isolated machines.

4. Accuracy and Sensitivity Specifications Across Product Types

Not all products require the same level of accuracy. A system designed for heavy industrial components operates differently from one measuring delicate food items or pharmaceuticals. Most commercial systems achieve accuracy between plus or minus 2 and 5 grams, though high-precision models can reach plus or minus 0.5 grams for smaller, higher-value products.

Sensitivity also depends on product characteristics. Liquid-filled packages, irregular shapes, or items with high surface moisture behave differently on a weighing platform than solid, uniform products. Some systems use multiple sensors or advanced algorithms to account for these variations and deliver consistent results. Before purchasing, verify that the equipment's specifications match your product type. Shawpak Systems offers demonstrations at our Centre of Excellence facility where you can test equipment with your actual products and confirm performance before commitment.

5. Maintenance, Calibration, and Long-Term Operating Costs

Like all precision equipment, checkweighers require regular calibration to maintain accuracy. Most facilities calibrate weekly or monthly, depending on production volume and regulatory guidance. Calibration involves running known-weight test weights through the system and adjusting the sensors to match. Neglecting this step causes measurement drift, leading to compliance failures and rejected products.

Beyond calibration, these machines have few moving parts in the weighing section itself, but the reject mechanism, conveyor interface, and electrical components all need periodic inspection. Dust, moisture, or product residue can accumulate, particularly in food processing environments. Shawpak Systems provides parts distribution and certified after-sales support across Canada and the USA, including on-site training so your maintenance team can perform routine service and troubleshooting. Planning for preventive maintenance and parts availability reduces unexpected downtime and extends equipment life by years.

Checkweigher equipment is an investment that pays for itself through compliance, reduced waste, and operational confidence. The decision to install one should account for product type, line speed, regulatory environment, and integration complexity. Shawpak Systems serves manufacturing and food processing facilities throughout Oakville and across North America, combining equipment supply with technical expertise to ensure your system performs reliably from day one.

If you are ready to evaluate checkweighing solutions for your facility, our team is prepared to discuss your requirements, arrange a demonstration, and guide you through selection and installation. Contact Shawpak Systems to speak with a specialist who understands your industry and your specific challenges.