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Frequently Asked Questions cont'd

16. What would be the price range for a typical production mold-set?  Prototype mold-set?  
The price range for production mold-sets will vary widely depending on number and type of cavities.  One-cavity mold-sets will typically range from $1800 to $3500.  Tarapath  offers prototyping services (where the mold-set remains property of Tarapath) for $800 to $2000, which would include 10 to 30 moulded parts.
17.  What features are on the PLC controller? 
The PLC controls temperature of reservoir and manifold, clamp operation, injection cycle including profiles and pump speed (VFD), component ejectors and some safety functions.
If mold-sets are provided by Tarapath, will a molding profile be pre-determined prior to delivery? 
Yes, any mold-set from Tarapath will be documented so that all molding parameters can be entered directly.  Some minor fine-tuning may be required as result of different ambient conditions.
19.  Has a chart been developed for adhesion of different substrates? 
A chart has been produced giving a + to ++++ rating for adhesion.  The Elgin laboratory is working on a chart that will quantify the adhesion and give real numbers.  However, especially in the electronics industry, newly designed substrates surface constantly.  We will continue to update the data table as the substrates are evaluated.
20. What is the lowest pressure that parts can be molded at? 
25 psi is typically the lowest practical pressure.  For anything lower the runner and gate design become very critical.
21. What is the typical viscosity of the material?
Macromelt molding materials have a viscosity range of 3400-7000 centipoise at 210ºC.  What can it be
compared to in its molten state?  In their fully molten state, Macromelt materials can be compared to maple syrup at
room temperature.
22. How are air bubbles avoided in the final molded part? 
By ensuring that a mold-set is vented correctly and optimizing the injection profile.  Densely populated circuit boards may require several steps in the injection profile to avoid any “shadow effects” behind components.
23. What is the maximum temperature that the materials can withstand during over-mold with a traditional resin? 
This is very dependent on the components to be over-molded and the shape/size of the cavity.  We can not offer a clear rule of thumb.
24. What is the typical shrinkage of the material and will the part maintain dimensional stability after molding? 
Shrinkage varies during injection and can usually be controlled by packing the mold with pressure.  The shrinkage rate 24 hours after injection ranges from 1 to 2% for the different materials.
25. How are the materials packaged?  Should they be dried prior to use? 
Materials are shipped in double walled 20kg bags.  To retain best material properties, it is recommended to dry
material prior to use.

Should you have further questions please contact Tarapath Pty Ltd
E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it    or   Telephone: +61.3.9269 6200

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