Thermoset Compound Compaction Behaviour

Scope and process

SMC, BMC and DMC compounds each flow differently: sheet compound is loaded as a charge pattern and flows to fill, bulk compound behaves more like a paste. Charge placement is a real process variable, because where the material starts determines how it knits and where weld lines end up.

Materials we work with

Once cured, the reaction cannot be reversed — there is no reprocessing a mis-moulded thermoset part the way a thermoplastic can be reground. That puts the emphasis on getting cure profile and charge weight right, since every fault becomes scrap.

Tooling support

Tooling is heated, usually electrically or with oil circulation, and needs even zone control across the cavity set. Venting is designed in rather than added later, and shear edges control flash without letting the compound escape before it cures.

Choosing the right option

Specify from cavity layout and part section: projected area of all cavities sets tonnage, section thickness sets cure time and therefore cycle rate, and the number of heating zones follows from the platen size and cavity spread.

Quality checks and inspection

Cure state is verified on the part rather than assumed from the timer — density and hardness across the cavity set reveal a cool cavity or a short cycle before a batch is committed.

Commissioning and handover

Establish the cure profile on the customer’s own compound. Supplier formulations differ, and a profile proved on one batch of compound is a starting point rather than a specification.

Export packing and lead time

HEMSUN is a DGFT IEC registered exporter (Government of India). Machines ship knocked down where transport requires it, with erection drawings supplied.

Maintenance and spare parts

Heater and thermocouple integrity dominates. Drift on a single zone shows up as scrap from that cavity only, which is why zone-by-zone temperature logging is worth having.

Specifications