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 SWT-7565 熱成形機 delivers continuous, fully automatic output with servo-driven precision.
| パラメータ | 仕様 |
|---|---|
| Forming method | Positive & negative pressure |
| Max. forming area | 760 × 650 mm |
| Min. forming area | 460 × 350 mm |
| Max. forming depth | 120 mm |
| 生産速度 | Up to 45 cycles/min (product-dependent) |
| 適切な素材 | PET、PP、PS、PVC、PLA |
| 板厚 | 1.5–2.0 mm (product-dependent) |
| Station layout | 3 or 4 stations (forming, punching, cutting, stacking) |
| Punching clamping force | 80トン |
| Heating ovens | 2 units, 1,925 mm total length |
| 設置出力 | ≈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.
光学的透明度
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 ツインスクリューPETシート押出機 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.
よくあるご質問
プラスチック製の卵トレイは、どの機械で作られているのでしょうか？
多ステーション式の正圧・負圧熱成形機です。PETシートを加熱し、空気圧を利用して卵カップとスナップロックを成形した後、トレイに穴を開け、自動的に積み重ねます。.
PET製の卵トレイは、紙パルプ製のトレイよりも優れているのでしょうか？
これらはそれぞれ異なる市場向けに提供されています。PETトレイは、小売店の陳列において透明性、剛性、耐湿性を備えているのに対し、パルプトレイは不透明で、見た目の魅力は劣ります。商品の視認性が販売につながる場合には、PETが好まれます。.
熱成形機は1時間に何個の卵トレイを生産できますか？
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.
卵パックの熱成形機は、再生PETを加工できますか？
はい、機械およびシートの仕様がrPETに対応していれば可能です。リサイクル素材は、成形前にシートが適切に結晶化および乾燥されていれば、熱成形に完全に適合します。.
PET製の卵トレイには、どの厚さのシートが使われていますか？
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.
卵トレイの型には、何個の穴が開けられますか？
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.