Giblet Harvester Product

Overview

A giblet harvester is a specialized multi-stage separator that processes the mixed viscera discharged from a poultry Poultry Evisceration Line and divides it into three streams: edible organs (liver, heart, gizzard), waste (intestines, fat, connective tissue), and fecal matter. The system must be gentle to avoid rupturing the delicate liver while efficiently separating the denser gizzard and heart from light stringy waste material.

Unlike standalone giblet processing, modern harvesters are integrated directly downstream of the evisceration line, receiving a continuous or batch stream of freshly extracted viscera. The entire process (separation, chilling, drying) takes 5–8 minutes per batch, enabling the organs to reach 4 °C before packaging, meeting food safety regulations (USDA, EU) for fresh organ products.

Modern harvesters also serve a secondary function: feed quality verification. Unusual viscera appearance (discoloration, inflammation, disease lesions) signals flock health issues and is logged during processing for traceability.

How it Works

The Receiving Hopper and Metering receives a dump of viscera from the evisceration-line waste chute or a continuous auger feed. A [[giblet-harvester-hopper|stainless funnel hopper]] (150–200 liters capacity) buffers the input, and a [[giblet-harvester-metering-auger|variable-speed auger screw]] meters viscera into the separator at 5–30 kg/min, controlled by the [[giblet-harvester-controls|PLC]].

The [[giblet-harvester-heavy-sep|heavy organ separator]] is the first processing stage. Viscera fall onto a [[giblet-harvester-heavy-screen|vibrating mesh screen]] (3–5 mm aperture) that oscillates at 10–30 Hz. The denser organs (gizzard, heart) settle and pass through the mesh, while lighter intestines and connective tissue remain on the screen surface and are diverted to a waste conveyor. The separated gizzard and heart drop into a collection tray and proceed to the Rapid Chilling Unit.

The [[giblet-harvester-liver-sep|liver separator]] is a parallel process for the liver, which is too delicate for mechanical separation. Viscera (or the waste fraction from the heavy separator) enter a [[giblet-harvester-liver-tank|chilled flotation tank]] (200–300 liters, 0–4 °C). The liver, being fatty, floats while intestines sink. A gentle [[giblet-harvester-liver-scoop|mesh conveyor or lift scoop]] gradually elevates the liver from the tank surface at 0.1–0.2 m/s, allowing water to drain through. This extremely slow handling prevents rupture. The separated liver is then routed to the chiller.

The [[giblet-harvester-waste-sep|waste stream]] (intestines, fat, mesentery, fecal matter) is conveyed away via an [[giblet-harvester-waste-auger|auger or slat conveyor]] toward a collection bin, rendering tank, or incinerator.

After separation, both [[giblet-harvester-heavy-outlet|clean gizzard and heart]] and [[giblet-harvester-liver-drain|drained liver]] enter the [[giblet-harvester-chiller|chilling unit]], a [[giblet-harvester-ice-bath|stainless tank]] (100–200 liters) maintained at 0–4 °C by a [[giblet-harvester-refrigeration|glycol refrigeration compressor]] (3–5 kW). Organs submerged for 2–3 minutes rapidly reach core temperatures of 4 °C, halting bacterial growth.

Finally, the [[giblet-harvester-dryer|centrifuge drying stage]] removes surface water. A [[giblet-harvester-centrifuge|stainless steel basket centrifuge]] (30–50 kg capacity) spins at 300–800 rpm for 30–60 seconds, flinging water from organ surfaces. This step extends refrigerated shelf life from 3 days to 5–7 days by eliminating the thin water film where bacteria preferentially colonize.

The [[giblet-harvester-controls|main PLC]] coordinates all stages: metering auger speed, separator vibration frequency, chiller setpoint, centrifuge spin time, and emergency shutdown.

Separation Technologies

Three separation methods are in use:

Vibratory screening (most common): The [[giblet-harvester-heavy-screen|vibrating screen]] oscillates vertically or horizontally at 10–30 Hz. Gravity and resonant motion allow small, dense particles (gizzard, heart) to pass through the mesh while large, light particles (intestines) remain on top. Advantages: simple, low maintenance, 95%+ separation efficiency. Disadvantages: noisy (85–90 dB), occasional blockage if intestines wrap around screen edges.

Rotary drum separation: A rotating perforated cylinder (like a washing machine drum) operates at 20–100 rpm. Viscera enter the drum interior; centrifugal force pushes denser items outward (they exit through holes in the drum) while lighter items remain in the center and exit a different port. More compact than vibratory systems and quieter (75 dB). Separation efficiency is similar (93–97%).

Air-assisted flotation: A gentle stream of compressed air rises through a water-filled tank containing viscera. Buoyant liver floats upward and is skimmed off; denser gizzard and heart sink to the bottom and are collected separately. Excellent for liver preservation (near 100% recovery without rupture) but slower (requires 3–5 min per batch) and requires significant air supply (50–100 L/min at 6 bar).

Most integrated harvesters combine vibratory heavy separation (fast, efficient) with flotation liver recovery (gentle).

Chilling and Food Safety Integration

The [[giblet-harvester-chiller|integrated chilling system]] is essential for food safety. Freshly extracted organs are at 15–20 °C; bacteria begin exponential growth above 10 °C. USDA and EU regulations mandate that organs reach 4 °C or below within 4 hours of evisceration. A [[giblet-harvester-ice-bath|submerged chiller]] (0–4 °C) achieves this in 2–3 minutes, providing a 3–4 hour safety margin.

The [[giblet-harvester-refrigeration|compressor unit]] (3–5 kW) is typically a scroll or rotary type running continuously or cycling on/off to maintain ±0.5 °C. Refrigerant is usually R404A (HFC) or hydrofluorocarbons; propylene glycol mixtures are sometimes used in food-adjacent applications for added leak safety. The [[giblet-harvester-thermostatic-valve|temperature control valve]] modulates refrigerant flow to the tank jacket, maintaining setpoint via a [[giblet-harvester-temp-sensor|RTD or thermocouple]] feedback loop in the [[giblet-harvester-controls|PLC]].

Chilling time depends on organ mass and tank circulation:

• Small organs (heart, liver <50 g): 2 minutes
• Large gizzards (200+ g): 3–4 minutes
• Mixed batch (50 kg): 2–3 minutes if organs are distributed evenly in the tank

Poor chilling (lazy circulation or insufficient refrigeration capacity) is the leading cause of organ spoilage in small processors.

Drying and Packaging Readiness

The [[giblet-harvester-dryer|centrifuge drying stage]] is not always required but is highly recommended. Wet organs (covered in a thin water film) have shortened shelf life:

• Wet organs: 3–4 days refrigerated before mold and Salmonella growth becomes visible
• Dry organs: 6–8 days refrigerated

A [[giblet-harvester-centrifuge|stainless basket centrifuge]] (30–50 kg capacity, 300–800 rpm, 30–60 sec cycles) removes ~70–80% of surface water, roughly doubling shelf life. The [[giblet-harvester-dryer-motor|motor]] is soft-started to prevent shock loading; ramp-up time is 10–20 seconds. Total water removal (including residual drain) yields organs with <0.5 g/100 g surface moisture.

After centrifugation, organs drop into packaging trays or are weighed for portioning. Some plants integrate a secondary 5–10 second air-blast drying stage (compressed air jets) for final polish.

Waste Handling and Byproducts

The [[giblet-harvester-waste-conveyor|waste stream]] (intestines, fat, bile sacs, fecal matter) comprises ~60–70% of the input viscera mass. This waste is typically:

• Disposed: incinerated on-site or collected in bins for rendering plant pickup
• Recovered: rendered (melted and cooled) into tallow (beef fat) or poultry fat for feed or soap manufacturing
• Composted: blended with feathers and other plant waste at full-scale poultry plants

Bile contamination in the waste stream is unavoidable but must be minimized in edible organs. A [[giblet-harvester-bile-catcher|bile sac separator]] or screen may be added to divert the delicate gallbladder (attached to the liver) to the waste stream before liver separation. Manual inspection of liver during collection is still standard practice in many plants to remove any adhering bile.

Integration with Evisceration Line

The giblet harvester sits directly downstream of the [[evisceration-line|evisceration-line drawing station]]. Viscera discharged from the drawing chute either:

1. Drop directly into the harvester hopper (batch mode): ~30 second accumulation, then hopper dump gate opens, viscera slides into the metering auger.
2. Feed continuously via a small auger or screw feeder from the evisceration-line waste chute (most automated plants).

A properly sized harvester matches the evisceration-line throughput:

• For 600 birds/hour: ~90 kg/hour viscera = 1.5 kg/min average feed rate. A [[giblet-harvester-metering-auger|metering auger]] set to 2 kg/min handles this easily.
• For 1200 birds/hour: ~3 kg/min feed rate requires an auger sized to 5+ kg/min to avoid bottleneck.

If the harvester is slower than the evisceration line, viscera accumulate in the waste chute or a buffer hopper, risking temperature rise and bacterial growth. Modern lines are designed to match equipment speeds within a 10–15% margin.

Monitoring and Quality Data

The [[giblet-harvester-controls|control system]] logs all processing parameters: feed rate, separator vibration frequency, chiller temperature, centrifuge speed, cycle time, and defect flags (if a vision system is integrated). This data is increasingly used for:

• Traceability: Linking organs to their source batch of birds
• Quality assurance: Detecting spoilage patterns or contamination trends
• Flock health: Noting livers with dark spots (necrosis), pale color (anemia), or unusual texture that indicate disease or feed issues
• Regulatory compliance: USDA and EU inspectors can request processing logs

Some advanced systems integrate a [[image-sensor|vision camera]] at the chiller discharge point, photographing each liver batch and flagging discolored or defective organs for quarantine.

Capacity and Sizing

Giblet harvesters are sized by input throughput (kg/min) and organ yield:

Bird Species	Input Rate	Organs Recovered	Waste
Broilers (1.5–2.0 kg)	5–10 kg/min	100–130 g/bird (liver, heart, gizzard)	400–450 g/bird
Turkeys (6–8 kg)	8–15 kg/min	350–450 g/bird	1500–1800 g/bird
Ducks (2–3 kg)	6–12 kg/min	120–160 g/bird	500–600 g/bird

For a mixed plant (600–1200 birds/hour of broilers), a 10–15 kg/min harvester is typical. For specialized turkey processing (300–400 birds/hour), a 15–25 kg/min unit is required to avoid bottleneck.

Maintenance and Service Life

The [[giblet-harvester-heavy-screen|vibrating screen]] mesh is stainless steel but wears over time (1–2 years) as repeated contact with hard gizzard fragments dulls openings. Replacement screen cost is ~1000–2000 EUR. The [[giblet-harvester-heavy-motor|vibrating motor]] (1.5–3 kW) typically lasts 3–5 years; bearing lubrication must be checked every 500 hours.

The [[giblet-harvester-liver-scoop|flotation tank and lift scoop]] require frequent cleaning (every shift) to prevent algae growth and off-flavor contamination. Perforated scoop plates must be inspected for blockage.

The [[giblet-harvester-refrigeration|refrigeration compressor]] (3–5 kW) typically operates 8–12 hours daily; hermetic scroll compressors last 8–10 years, rotary compressors 5–7 years. Regular liquid analysis (R404A oil sampling every 2 years) detects moisture ingress and acid formation early.

The [[giblet-harvester-centrifuge|centrifuge basket]] is stainless steel and highly durable; bearing lubrication is the primary maintenance (NSF H1 oil, every 1000 hours).

Total cost of ownership (capital + 5-year maintenance and parts): ~50,000–100,000 EUR for a medium-capacity unit (10–15 kg/min), with payback periods of 2–4 years in high-volume plants due to extended organ shelf life and reduced spoilage waste.