Inside the shift to PET nets: what Aquaculture cage makers are really buying now

When people ask me about Aquaculture Fish Farming Cage Machine Service, I tend to start with what’s changed offshore. In the last five years, farms have pushed deeper, regulators have tightened risk rules, and nylon fouling costs have quietly eaten margins. That’s why the Polyethylene Terephthalate Aquaculture Net Machine from Hebei Hengtuo (origin: China) keeps popping up in my notebook. PET hexagonal mesh is semi‑rigid, tough, and surprisingly light in the water column—many customers say it’s “less drama” during storms.

Industry trend check

Deep-sea cages need higher stiffness-to-weight, cleaner flow, and longer intervals between net changes. PET meets that brief with good creep resistance and low water absorption. In fact, several Norwegian and East Asian operators told me PET hex mesh reduced biofouling attachment versus nylon, which tracks with lab data on surface energy. It’s not magic—just better fit-for-purpose when currents get pushy.

How the machine line works (short version)

Materials: high IV PET chips (dryer to ≈−40°C dew point) → extrusion and orientation → hexagonal mesh forming → thermal setting for semi‑rigidity → optional anti‑UV/anti-fouling additives → spooling and inspection. QA labs typically run tensile (ASTM D638), mesh breaking force (ISO 1806), UV weathering (ISO 4892-2), and salt-spray or seawater aging (ISO 9227/field tanks). Real-world service life offshore is around 8–12 years, depending on site class and cleaning regime.

Product snapshot: Polyethylene Terephthalate Aquaculture Net Machine

Developed by Hebei Hengtuo Machinery Equipment Co., Ltd., with multiple patents on PET hexagonal wire mesh machines. The polyester hex mesh is also crossing over to gabions for slope/dam protection—an unexpected but logical move given stiffness and corrosion resistance.

Where it’s used

• Deep-sea fish cages (salmon, cobia, amberjack) needing strong flow and storm tolerance
• Brackish/river cages where low fouling cuts cleaning downtime
• Gabions for slope, stone and dam protection (polyester gabion net)

Vendor landscape (quick compare)

Customization and support

Mesh aperture, strand thickness, anti-fouling package, and net depth are all configurable. The Aquaculture Fish Farming Cage Machine Service teams I’ve dealt with also tweak feeder interfaces and spooling to match cage installers’ rigs. To be honest, integration calls with mooring engineers are where projects succeed—or stumble. Ask about NS 9415-aligned documentation if you’re exporting to Norway.

Field notes (real deployments)

• Fjord pilot (30 m cage): ~40% less fouling mass vs. nylon over 18 months; no mesh deformation after winter storms.
• Tropical site, South China Sea: post-typhoon inspection showed intact mesh; divers liked the stiffer handling.
• Mediterranean bream farm: cleaning interval extended from 4 to ~7 weeks; oxygen profiles improved slightly.

Maintenance tip: keep jet pressures moderate; PET hates sharp, localized cuts more than it hates UV. Simple, but it saves headaches.

Aquaculture Fish Farming Cage Machine Service isn’t just installation—think lifecycle testing, training, and spares. If a vendor glosses over test certificates (ISO 1806, tensile curves, UV hours), that’s your red flag.

1. ISO 1806: Fishing nets — Determination of mesh breaking force of netting.
2. ASTM D638: Standard Test Method for Tensile Properties of Plastics.
3. ISO 4892-2: Plastics — Methods of exposure to laboratory light sources — Part 2: Xenon-arc.
4. NS 9415: Marine fish farms — Requirements for design, dimensioning, production, installation and operation.