Part size and weight
The projected area and shot weight decide the accumulator size and clamping force.
Large & technical parts
Medium & Large Hollow Parts: Machine Configurations
Accumulator-head configurations for ice buckets, tool boxes and other medium or large hollow products, with published specifications.
- Typical size
- 20–160 L
- Materials
- HDPE · PP
- Machine series
- TDB
- Suggested models
- 3
In short
Medium & Large Hollow Parts: what to know
Medium and large hollow parts, such as tool boxes, ice buckets, coolers and pesticide tanks, need accumulator-head machines with large platens. Tongda TDB machines are configured around the part drawing, target weight and mold envelope.
The TDB series combines accumulator-head configurations with guided mold movement and servo drive options. Start with a product drawing, target weight and mold envelope to assess suitability.
Typical products
- Tool boxes and equipment cases
- Ice buckets and coolers
- Pesticide and sprayer tanks
- Large hollow housings
Materials
- HDPE
- PP
Production process
How the production line works
- Step 01
Prepare the resin
Blow-molding grade resin, masterbatch and regrind are dosed to the product specification.
- Step 02
Extrude the parison
The extruder melts the material and the die head forms a hollow tube of controlled wall thickness.
- Step 03
Close and blow
The mold closes on the parison and compressed air forms the part against the cavity.
- Step 04
Cool and release
The part cools in the mold until it holds its shape, then the mold opens and the part is removed.
- Step 05
Trim and finish
Flash at the neck, handle and base is removed; necks are cut or reamed where required.
- Step 06
Inspect and pack
Weight, dimensions and leak tightness are checked before labeling and packing.
Selection guide
Choosing a machine
Mold envelope
Check the maximum mold size and platen opening for the part and its inserts.
Double-wall design
Tool boxes and cases are often double-walled, which affects parting lines and cooling.
Finishing
Plan deflashing, hinges and any secondary operations with the line.
Machine configurations
Medium & Large Hollow Parts line configurations
TDB-50F
≤ 50 LAccumulator-head extrusion blow molding for 20–50 L products, with bottom blowing and a servo motor.
- Stations
- Single
- Clamping
- 260 kN
- Power
- 103.9 kW
TDB-80F
≤ 80 LAccumulator-head extrusion blow molding for 50–80 L products, with bottom blowing and a servo motor.
- Stations
- Single
- Clamping
- 440 kN
- Power
- 131.5 kW
TDB-120F
≤ 120 LAccumulator-head extrusion blow molding for 80–120 L products, with bottom blowing and a servo motor.
- Stations
- Single
- Clamping
- 740 kN
- Power
- 131.5 kW
| Model | Stations | Max. volume | Clamping force | Screw | Total power | Max. mold (W × H) | Datasheet |
|---|---|---|---|---|---|---|---|
| TDB-50F | Single | 50 L | 260 kN | 90 mm | 103.9 kW | 700 × 950 mm | PDF · 2.2 MB |
| TDB-80F | Single | 80 L | 440 kN | 100 mm | 131.5 kW | 800 × 1000 mm | PDF · 2.3 MB |
| TDB-120F | Single | 120 L | 740 kN | 100 mm | 131.5 kW | 900 × 1450 mm | PDF · 2.1 MB |
Suggested starting points from the published range. The final configuration depends on your product drawing, resin, weight and output target.
Quotations, prices and project cases: Tongda medium and large hollow part machines on tongdamachine.net ↗
Video & product gallery
Medium & Large Hollow Parts
Watch on YouTubeMachine in operation
See the medium & large hollow parts line running
Watch a Tongda machine producing this type of product, from parison extrusion to the finished part. For a video of a specific model or configuration, ask our team.
More machine videos
Questions from buyers
FAQ
Didn't find your answer?
Ask our engineersWhich machine makes tool boxes?
TDB accumulator-head machines such as the TDB-50F and TDB-80F are the usual starting points. Send the drawing to confirm the platen and mold size.
Can double-wall cases be blow molded?
Yes. Double-wall cases and boxes are a common application; the mold design determines the parting line and wall distribution.
What should I send for a quotation?
A drawing or sample, part weight, material, required annual quantity and any inserts or finishing steps.
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