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Rotary Platens

Rotary Platens    Benefits    Features    Models    FAQ's

Frequently Asked Questions
Questions About MGS Built Portable Injection Units
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Questions About Rotary Platens

What if I need a platen that isn't listed in the "Specifications" page?
We offer custom models to fit your specific needs. Bolt hole patterns, knock out patterns, platen style, rotation, size, and other options can be configured into the rotary platens we build.

How accurate is the positioning?
Our rotary potentiometer provides accuracy within two arc seconds (distance from center of the rotary platen is a variable). The rotary potentiometer provides the accuracy of a servo driven unit (servo driven models are available).

Can more circuits be created?
Yes. We offer additional hydraulic, water, air, and electrical circuits. When we split a circuit, another seal in the water union is added (increasing the shut height). We can bore a hole into the SPI platen to make it similar to Euro style platen models.

How do you get hydraulics for core/ejector functions?
There should be a seal between hydraulic and water lines to prevent leaks in water and oil lines. Options include the installation of a separate union out the back of the press through the center KO hole (requires elimination of the center ejector knock out on the machine) or the addition of a separate union (adds shut height). Other options are possible.

What are straight locks for?
Straight locks are for verification of true positioning during mold set up and installation. Straight locks keep the mold on center and eliminate any table shifting from the rotary torque that comes from tightening down mold clamping bolts.

Can I just purchase a rotary platen?
Rotary platens may be purchased independently. You will need one of these three items to control the table: 1. UMS controller 2. The machine manufacturer to incorporate a special sequence (we have worked with several manufacturers already). 3. Purchase of a separate RP controller from us.

How is the table centered?
The center of the mold is critical and must be centered over the rotary platen. Multishot molds mount differently than single shot molds. A single shot mold is mounted to the stationary platen. The "B" side of a multishot mold is mounted onto the rotary platen. The rotary platen is the center and the nozzle can be adjusted to this new center.

Note: You generally do not need a locating ring installed on the stationary mold side, but tapered interlocks are needed to ensure true position. Tapered interlocks help the mold to quickly fall into place on the rotary platen. Centering of the mold is vital because of mold rotation. If it is not centered accurately, the steel will start galling and flashing.

How are seals & sealing of the water circuits performed?
SPI standard rotary platens have two circuits. The water comes in from the fixed portion of the rotary platen (base plate) where two ¼ NTP circuits feed into one channel in the water union (center rotating shaft) of the rotary platen. It is fed into the moving portion of the platen (rotating plate) and is separated back into two ¼ NTP circuits. The circuit in the water union has the same volume to handle the capacity for the two ¼ NTP feed circuits.

We can flush mount to a SPI standard press platen. This is different than Euro style platens because they require a hole in the center that allows water jackets and water circuits to go into the moveable platen.

How fast is your platen rotation?
Our rotary platen speed is performed to above industry standards. On smaller platens, the rotation is less than one second; bigger platens can be two to three seconds.

Note: Speed should generally not be the main criteria for selecting or purchasing a rotary platen. Part cooling time on the core is made up of three segments:

A: During 1st shot molding cycle
B: During rotation of the mold
C: During 2nd shot molding cycle

The combination of time during rotation, time on the core, and time during cooling are adjustable. If speed is a concern it is best to save time during the cooling period rather than rotation time. It is beneficial to rotate at a practical speed to safeguard turntable mechanics and reduce maintenance and cost.

If speed is of optimal importance because thin wall or other applications are being used (cooling time is limited), we offer equipment and answers for successful operation.










Rotary Platen Assembly U.S. Patent # 6,402,504 B1
(Other patents pending)