PET egg tray making machines are high-speed thermoforming lines that heat rigid PET sheet and form it into clear, protective egg clamshells. For industrial egg packaging output, the machine to buy is a multi-station positive and negative pressure thermoforming machine — not a paper pulp former.
That single distinction decides whether you produce 5,000 or 30,000 retail-ready trays per shift.
The Short Answer: Positive and Negative Pressure Thermoforming Machines
An egg tray thermoforming machine unwinds PET sheet from a roll, heats it to forming temperature, shapes the egg cups and snap-locks under combined positive and negative air pressure, then punches and stacks the finished trays in-line.
Positive and negative pressure forming is essential here. Egg clamshells require deep cups, tight corner definition and a closing snap-lock — geometry that vacuum-only forming cannot reproduce at production speed.
Why PET Egg Tray Making Machines Outperform Paper Pulp Alternatives
Plastic egg packaging wins on four commercial points:
- Shelf appeal. Optical-grade PET shows the product through a crystal-clear wall. Paper pulp cannot.
- Rigid protection. Deep cups and snap-locks keep eggs fixed during transport, cutting breakage rates.
- Hygiene. Food-contact PET sheet is smooth, non-absorbent and easy to seal — no fiber dust, no moisture uptake.
- Unit cost at volume. Full automation keeps labor at 1–2 operators per shift, and uniform wall thickness optimizes material use.
How Plastic PET Egg Trays Are Produced: The 4-Step Process
- Sheet feeding. A motorized unwinder feeds PET sheet rolls into the line at controlled tension.
- Heating. Ceramic heating zones raise the sheet to its exact thermoforming temperature, with multi-zone control that protects clarity.
- Pressure forming. Positive and negative air pressure shapes the deep egg cups, ribs and snap-lock contours.
- Cutting and stacking. Integrated punching trims every tray cleanly, then automatic stacking counts and stacks the finished product.
High-Speed Solution: The SWT-7565 Thermoforming Machine
[Image: SWT-7565 PET Egg Tray Thermoforming Machine – TZ Machinery]
For egg packaging at industrial volume, the Машина для термоформования SWT-7565 delivers continuous, fully automatic output with servo-driven precision.
| Параметр | Технические характеристики |
|---|---|
| Forming method | Positive & negative pressure |
| Max. forming area | 760 × 650 мм |
| Min. forming area | 460 × 350 mm |
| Max. forming depth | 120 мм |
| Скорость производства | Up to 45 cycles/min (product-dependent) |
| Подходящие материалы | ПЭТ, ПП, ПС, ПВХ, ПЛА |
| Толщина листа | 1.5–2.0 mm (product-dependent) |
| Station layout | 3 or 4 stations (forming, punching, cutting, stacking) |
| Punching clamping force | 80 тонн |
| Heating ovens | 2 units, 1,925 mm total length |
| Установленная мощность | ≈140 kW |
Why the SWT-7565 Excels for Transparent Egg Packaging
Fast Cycle Speed
At up to 45 cycles per minute, multi-cavity egg molds multiply output quickly. At 30 cycles/min with a 10-cavity mold, theoretical output reaches roughly 18,000 trays per hour — capacity that scales with cavity count rather than headcount.
Servo-Driven Accuracy
Full servo control on sheet feeding, mold clamping and plug assist holds uniform wall thickness across deep egg cups and delivers a clean, burr-free trimmed edge.
Оптическая четкость
Multi-zone heating spreads temperature evenly across the sheet, preventing hazing or optical distortion in transparent PET.
PET Egg Tray Applications and Buyer Profiles
Typical products and the buyers who run them:
- Retail egg clamshells — 6-egg, 10-egg and 12-egg packs for supermarkets and egg brands
- Specialty egg trays — quail, duck and bantam egg packs
- Transport and hatching trays — rigid, stackable, ventilated configurations
- Egg-packaging converters — third-party food packaging manufacturers serving multiple egg brands
How to Choose a PET Egg Tray Making Machine
Match the machine to your mold and material before comparing prices:
- Cavity count vs. forming area. Confirm your egg mold fits the forming area — for example, 760 × 650 mm on the SWT-7565.
- Forming depth and draw ratio. Deep egg cups need a machine rated for the depth, typically 110–120 mm and above.
- Sheet thickness and material. Virgin PET, rPET, PLA and PP behave differently; confirm the machine’s rated thickness range against your sheet spec.
- Cycle time vs. target output. Work backwards from required trays per hour to cavities and cycle time.
- Cutting method. In-mold punching avoids a second operation and protects the tray rim.
- Upstream sheet supply. If you plan to extrude your own sheet, pair the former with a двухшнековая машина для экструзии листов ПЭТ for integrated rPET production.
Two further TZ-machinery models are worth comparing for egg packaging projects: the TZ-7385 positive and negative pressure thermoforming machine, a three/four-station line with a large forming area, and the TZ-6245 high speed multi-station thermoforming machine, which trades forming area for higher precision on smaller products.
Summary: Matching the Machine to Your Egg Tray Line
PET egg tray production comes down to three variables — forming technology, speed and mold capacity. A positive and negative pressure thermoforming machine with servo indexing and in-line cutting gives you clear, rigid, retail-ready trays at the lowest unit cost.
ЧАСТО ЗАДАВАЕМЫЕ ВОПРОСЫ
What machine makes plastic egg trays?
A multi-station positive and negative pressure thermoforming machine. It heats PET sheet, forms the egg cups and snap-locks under air pressure, then punches and stacks the trays automatically.
Are PET egg trays better than paper pulp trays?
They serve different markets. PET trays offer transparency, rigidity and moisture resistance for retail display, while pulp trays are opaque and lower in visual appeal. PET is preferred where product visibility sells.
How many egg trays can a thermoforming machine produce per hour?
Output equals cycles per minute × cavities per mold × 60. At 30 cycles/min with a 10-cavity mold, theoretical output is about 18,000 trays per hour; actual output depends on sheet material and mold design.
Can egg tray thermoforming machines process recycled PET?
Yes, provided the machine and sheet specification suit rPET. Recycled material is fully compatible with thermoforming when the sheet is properly crystallized and dried before forming.
What sheet thickness is used for PET egg trays?
It depends on tray size and cup depth. Confirm the thickness against the machine’s rated range before ordering the mold, since deep cups need sufficient wall thickness to hold shape.
How many cavities can an egg tray mold have?
Egg tray molds commonly carry 6, 10 or 12 cavities per cycle. The practical limit is the machine’s forming area — a larger forming area allows more cavities and higher output per stroke.
Do I need a PET sheet extrusion line as well?
Only if you want to produce sheet in-house. Buying finished PET sheet and running a thermoformer is the faster route; adding an extrusion line lowers material cost on high-volume rPET projects.
What determines the price of a PET egg tray making machine?
Forming area, station configuration, servo system, heating zones, mold design and automation level.