Leshan-Standard for Extrusion Heads of the „Berlin Series“
Head with hearth curve design; Max. die size 280mm.
In the standard design of hearth curve heads two opposite located hearth curves are forming the parison. The right picture demonstrates a cut of the parison during a color change.
At the feeding point of each hearth curve is a thicker wall thickness than at the tip of the hearth curve. If two hearth curves are in opposite position, they compensate this unevenness and form a parison together with even wall thickness. The welding lines are much thinner than the covering thick layer of the opposite hearth curve, which is an advantage for the drop test of the container.
Heart Curve Heads
Leshan‘s hearth curves of the Berlin Series are calculated and designed with help of special simulation programs. They can process HMWPE with low MFI and therefore we like to use them for the production of containers above 5 liter volume. At Leshan we know how to handle decisive details of hearth curve design to get a short cleaning time and a perfect wall thickness distribution.
Hearth curve heads can be provided up to 6 layers.
In the standard design of smaller spiral curve heads usually 4-8 spirals are forming the parison. The right picture demonstrates a cut of the parison during a color change.
In a spiral head you cannot detect any welding lines, which could weaken the container.
The spirals are fading out at its ends.
Spiral heads
Leshan‘s spiral curves of the Berlin Series are calculated and designed with help of special simulation programs.
Spiral heads work very well with bottle materials and we like to use then for containers below 5 liter volume.
Spiral heads are generally well known for their short cleaning time and a perfect wall thickness distribution.
Spiral heads can be provided at Leshan up to 6 layers.