Heatlock ESB2, Electric Sprue Bushing

This Heatlock series, below, is currently being replaced by the A1-series of nozzles.
Before you design check availability, stock is gradually decreased.
Spare parts will be available until at least end of 2007 (apart form NPT1 bodies)
INTRODUCTION
How you can be more effective and more competitive by
using our ceramically insulated Heatlock hot-runner system.
The old way with a
cold sprue
Let us assume you are going to make a new mould with
8 cavities.
If you make it in the old way will it look as fig1.
Measured on the sketch the maximum length of flow in
cold steel is 75mm.
Please note as well that flow lengths to each different
cavity are not equal which means you will not have an
identical fill of each cavity.
fig. 1.
If you make the mould as shown in fig.2 and use a Heatlock
electric sprue bush will you eliminate the conventional
thick and long sprue.
In many cases the part which has the thickest wall section
determines cooling time instead of each cavity.
Advantages:
Improved efficiency with a Heatlock
sprue bushing
— Flow length in cold steel has been reduced by
38%. Everyone familiar with injection moulding
knows that it is easier to mould when flow length
is short.
— Cycle time can be reduced, the thickest part of
the shot has been eliminated.
— Less production stops – no sprue that can get
stuck in the fixed half of the mould.
— No risk on automatic production that last shot will
stick on earlier produced ones when ejected.
The most difficult part to cool has been eliminated.
— Opening stroke can be reduced as part height is
decreased with shorter cycle time as a result.
fig. 2.
Fig 3. demonstrates an improvment using 2 electric
sprue bushes, ESB's, including a manifold.
You now produce the following advantages:
1.8
Date: 031118, © LKM Heatlock Co Ltd