Part geometry
3D shapes, undercuts and wall distribution decide the parison and mold design.
Large & technical parts
Automotive Hollow Parts: Machine Configurations
Accumulator-head configurations for automotive ducts, reservoirs and other hollow components, with published specifications side by side.
- Typical size
- Part dependent
- Materials
- HDPE · PP · Engineering resins (by project)
- Machine series
- TDB
- Suggested models
- 2
In short
Automotive Hollow Parts: what to know
Automotive hollow parts, such as air ducts, washer and coolant reservoirs, spoilers and seat backs, are extrusion blow molded from HDPE, PP and engineering resins. Tongda TDB accumulator-head machines are configured to the part drawing and service conditions.
Specify the part drawing, resin grade, service conditions and required dimensional checks. Machine suitability and finished-part qualification are reviewed for the particular application.
Typical products
- Air ducts
- Washer and coolant reservoirs
- Spoilers and trim parts
- Seat backs and panels
Materials
- HDPE
- PP
- Engineering resins (by project)
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
Material
The resin grade and service temperature decide the screw and heating configuration.
Dimensional checks
Agree the measuring and fixture checks for each part.
Qualification
Part qualification is carried out with the automotive customer for the specific application.
Machine configurations
Automotive 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
| 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 |
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 automotive part machines on tongdamachine.net ↗
Video & product gallery
Automotive Hollow Parts
Watch on YouTubeMachine in operation
See the automotive 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 automotive ducts?
TDB accumulator-head machines such as the TDB-50F are a common starting point. The final choice depends on the part size and material.
Can engineering plastics be processed?
Some engineering resins can be processed with a suitable configuration. Share the material data sheet to confirm.
Does Tongda supply the molds?
Tongda’s mold division designs and manufactures blow molds and can quote the mold with the machine.
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