Injection Stretch Blow: a Precise Neck, a Strong Body
One process makes the preform and blows it in the same machine. The neck keeps injection tolerance; the body gains strength in two directions.
Why It Exists
A two-stage blow moulds the preform, cools it, then reheats and blows. One-stage does both in line: the neck stays as moulded, and the body is stretched axially and radially while still hot. That is what makes a 500 ml bottle at 20 g hold its shape with a thin wall.
What It Is Good For
Bottles where the neck must be exact — a pump that must not leak, a closure that must torque consistently — and the body must be light. Clear PET cosmetics, personal care, food.
Where It Stops
Shape freedom. A pronounced waist, a handle or a hard corner is a blow-moulding question: the parison has to reach the corner without thinning. Deep undercuts are simply not possible.
What to Send
Capacity, neck, weight target and a drawing or a reference bottle. If the weight matters, say what it is for — freight, feel, or a sustainability claim — because the answer changes the wall.
Need a Light Bottle With a Tight Neck?
Send the capacity and the closure.