The experiment with the family mold
described above was simple: 30 shots were collected, and the weights of the individual cavities and the runner were recorded.
Although not new, Mitsubishi Heavy Industries (mhiinj.com) demonstrated an interesting technique called Sequential Cavity Separation (SCS), which uses valve gates in a family mold
to inject two similar or different parts in sequence.
Fanuc's optional iRVision allows the robot to recognize and locate different parts produced by a family mold
in random positions.
The smallest machine in the series used FFC and MCM to achieve uniform filling of an eight-cavity cold-runner family mold
producing equal numbers of two different sizes (0.79 and 1.35 g) acrylic paper clips.
Caption: Assembly of Eddie, a toy robot, from eight parts in a family mold
, was demonstrated with a dual-main-arm robot at NPE 2012 and 2015.
"You should never use sequential valve gates to artificially balance a non-family mold or a family mold
where the imbalance is larger than the part delta," Gattshall says.
If you have a family mold
or need a runner turn-off (RTO) for some reason, there is no reason you can't EDM a hex into the top of a recessed sprue puller.
The Allrounder 1120H will be molding a PP folding step stool, molded in an eight-cavity family mold
and snapped together in an adjoining cell with a pair of six-axis robots.
to r.) thick-wall PET cosmetic bottles (two different designs in a family mold
); pasteurizable beer bottles; airline liquor miniatures in 48 cavities; sports bottles of Tritan copolyester; and heat-set, hot-fill jars that can accept a metal lug cap.
Assembly of parts from a family mold
, palletizing, and labeling are examples of operations that can be influenced by the mold layout.
The base unit is injection molded in a family mold
in two halves.
Comet notes that in a family mold
, for instance, a standard lens can be focused on the larger parts, while a zoom lens focuses on the smaller or even micro-sized parts.