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A blow moulding machine makes hollow plastic parts. Hot plastic is shaped into a tube or a preform, placed in a mould and inflated with air until it touches the cavity. That single idea covers three shop-floor processes: extrusion blow moulding, injection blow moulding and stretch blow moulding. They share the word “blow”. They do not share the same machine.
Use this page to tell the processes apart. Use the other articles when you already know the job: HDPE, plastic types, automatic cycles, or how to choose a manufacturer.
It is the press, extruder or heating oven, the blow air supply, and the clamp that holds the mould. The mould is the tool that carries the shape. People often say “machine” when they mean both. When you enquire, say whether you need the machine, the mould, or both. Panchal lists machines and blow moulds separately, and PET moulds on their own.
Plastic has to be soft enough to stretch and cool enough, a moment later, to hold the shape. Air pressure does the stretching against the cavity wall. Cooling channels in the mould take the heat out. If the plastic is too cold it will not fill the corners. If it stays hot too long the part distorts as the mould opens. Every setting on the machine is a way of holding that window for one particular bottle.
Granules are melted in an extruder and leave through a die as a parison. The mould pinches the tube and air inflates it. This process is the usual one for HDPE and PP bottles, jerry cans and drums. A continuous parison suits lighter, repeating bottles. An accumulator head stores melt and shoots a heavier parison so the tube does not sag. Panchal lists both: Continues Parison Series and Accumulator Parison Series, plus Extruder Blow Moulding.
Flash is left where the mould pinches. It is trimmed later or in an auto-deflash station. Necks are formed in the mould, so the calibration of the neck is part of the tool design.
The machine first injection-moulds a parison on a core rod, including the finished neck. It then transfers that parison into a blow mould and inflates it. The neck threads are sharp because they were moulded, not pinched. The process suits smaller bottles that need a precise finish. It is a poor fit for large jerry cans. An extrusion machine cannot be treated as an injection-blow machine by changing the mould.
A PET preform is reheated, stretched lengthwise with a rod, and blown radially. The stretch lines up the polymer and gives the clear, light bottles used for water and drinks. Preforms are made on an injection machine, often in a different plant. Panchal’s PET mould listing is the tooling side of that conversation. The Delhi article PET mould supplier in Delhi stays on moulds rather than on extrusion lines.
HDPE and PP dominate extrusion blow moulding. PVC is still specified for some packs and needs its own temperature window. PET dominates stretch blow moulding of clear bottles. Multi-layer walls combine materials when the pack needs a structure a single polymer does not give. Adding a second resin is a head and extruder decision, not a setting you turn on later. See the Multi Layer Series if that is the brief.
Packaging is the main use: household chemicals, lubricants, edible oil, personal care, agrochemicals and water. Technical parts such as ducts, floats and small tanks are blown when the shape is hollow and the volume justifies a mould. Caps, crates and most solid parts are injection moulded, not blown. If the part must be open and hollow, blow moulding is the family to study. If it must be a precise solid, it is not.
Blow moulding makes large hollow shapes with relatively light tooling compared with rotomoulding’s cycle, and it repeats a neck that a filler can close. Wall thickness is harder to hold in a corner than it is in injection moulding, and the pinch-off is a seam you have to design for. Stretch-blown PET is clear and light, but it depends on a preform supply. Extrusion blow is flexible about bottle size, but flash and neck calibration need attention. None of these limits is a reason to avoid the process. They are the reason to match the process to the part before you ask for a quotation.
A local starting point is blow moulding machine in Delhi. The company range is summarised on Panchal Blow Moulding.
Panchal – Aman Engineering Works publishes extrusion blow moulding series, colour-head and multi-layer options, custom machines, blow moulds and PET moulds from a workshop in Delhi. Bring the process choice from this guide to that list, and ask which series matches. The product page is the index.
Extrusion blow, injection blow and stretch blow. Extrusion starts from a parison of melted granules. The other two start from a moulded preform or parison.
Extrusion blow moulding, often with an accumulator head when the container is heavy. HDPE is the usual polymer.
Stretch blow moulding of PET preforms. That is not an extrusion parison process.
No. The melt system, the mould and the sequence are different. Choose one process for the part you have.
Parison or preform quality, mould cooling, neck calibration and how consistently the cycle is repeated. The machine cannot correct a mould that does not match the neck.
No. Both depend on the container. Ask against a sample rather than against a generic bottle.
Use the contact page, call +91 7011170110 or +91 7011170112, or WhatsApp +91 7011170112. Email is panchalcnc180@gmail.com.
If the resin is HDPE, open the HDPE article. If you are scoring suppliers, open the manufacturer checklist. If the cycle must run with little handling, open the automatic machine article.
Say whether you need extrusion, a PET mould conversation, or help choosing. The workshop can answer against the range it actually lists.
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Founded by Mukesh Kumar PANCHAL AMAN ENGINEERING WORKS has established itself as a trusted name in the field of Plastic Blow Extrusion Automatic Moulding and Blow Moulds, Pet Moulds, Roto Moulds, Injection Moulds.
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Founded by Mukesh Kumar PANCHAL AMAN ENGINEERING WORKS has established itself as a trusted name in the field of Plastic Blow Extrusion Automatic Moulding and IBM Machines.