Blow Mould Quality: What a Buyer Should Check

Views: 3403 Author: Howie SUN Publish Time:
A device on the conveyor is only worth its cost if the line stops when it stops, or the defect rate rises when it is off. Slider opening and closing mold adopts HUSKY mechanical internal mold clamping, the material is S136 high-strength anti-corrosion steel, and the structure is reliable.

Provides Excellent Mold Quality

Key facts at a glance
Supply scopePrinters, coders, cap feeders, nitrogen dosers, detectors
FunctionSupport the filler without changing its rating
Key controlPosition, timing, consumable cost
IntegrationSignals from the filler PLC or a standalone sensor
Key decisionWhether the device earns its cost per 1,000 units
Typical positionAfter the filler, before the packer

What does this device actually change on the line?

Support equipment does not raise the filler rating. It removes a manual task, a reject source or a compliance risk. The test is simple: if the device stops, does the line stop, and does the defect rate rise? If neither, it is a convenience rather than a control.

Where does it sit in the line sequence?

Position follows the signal. A coder needs the bottle presented at a fixed gap; a cap feeder needs a buffer before the capper; a detector needs a clear view and a reject gate downstream. Moving any of them changes the timing and the reject logic.

Internal stress of the template is completely relieved, and it is kept at about 500°C for 36 hours in a vacuum state, and gradually cooled out. After the furnace is finished, the template will not be deformed after long-term use.

DeviceWhat it controlsConsumable
Coder or printerDate and batch codeInk, solvent or laser power
Cap feederCap supply to the capperNone, but a buffer is needed
Nitrogen doserHeadspace oxygenNitrogen per 1,000 units
Fill level detectorReject decisionNone, but a reject gate is needed

Rated output, change parts and services are listed on the Accessory page.

What should be checked at acceptance?

Run the device at the line rating, not at a demonstration speed, and count rejects with the device on and off. Acceptance at half speed hides the timing problem that appears in the first production week.

The unit behind this configuration is the Conveying.

What does a cap sorter need to run reliably?

A consistent cap, a correct chute angle and a hopper that is never empty. Most cap jams are the chute and the level, not the sorter. A low-level sensor that stops the line before the hopper empties prevents most of them.

The same question is worked through from another angle in Nitrogen Dosing Machine: Dose, Timing and Dissolved Oxygen.

How to read the numbers. Every figure in this note is a reference range from the product specification, not a guaranteed output. Setup, adjustment and upstream stops sit outside a rated rate, so plan on 0.65-0.85.

Frequently asked questions

Does a nitrogen doser increase line speed?

No. It does not change the filler rating. It reduces headspace oxygen, which protects shelf life. Its value is measured in shelf life and rejects, not in BPH.

What is the difference between a coder and a labeller?

A coder applies variable data such as a date or batch code. A labeller applies the product label. Both sit on the conveyor, but only the labeller carries brand and legal product information.

Does a fill level detector need a reject gate?

Yes. Detection without a reject gate only records the defect. The gate needs a shift register so it rejects the bottle that was measured, not the one behind it.

Where should a nitrogen doser sit?

Between the filler and the closure, close enough that the gas stays in the headspace. Moving it further downstream wastes gas and gives an unstable result.

Key takeaways
  1. Support equipment removes a task or a defect; it does not add capacity.
  2. Acceptance at production speed, not at demonstration speed.
  3. A device without a reject gate only records the defect.
  4. Consumable cost per 1,000 units belongs in the comparison.
About the author
Written by the Sunswell engineering team - led by Howie SUN, Founder & CEO, with 14 years in filling and blow-moulding equipment R&D and turnkey project delivery across 71+ countries.
Last reviewed: 2026-08-28 . Reviewed by Sunswell engineering team
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