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Transfer Presses

In concept, the transfer molding process is a simplified version of injection molding. It provides many of the benefits of both injection and compression press molding. Transfer molding presses allow the molding of intricate parts while providing highly accurate dimensional control for low to medium production volume requirements. The cycle times are generally longer than injection molding, however they can be very cost-competitive.

Transfer Molding Press

A transfer molding press can also reduce cure time by heating the material before it reaches the mold. The material can be and is forced into a closed mold by means of a hydraulically operated plunger, or by using the compressive force of the press in combination with a tooling with an internal transfer pot.

The transfer molding press was developed to facilitate the molding of intricate products with small deep holes or numerous metal inserts. It is ideal for insert molding because the tool is closed prior to the material being transferred, which limits the amount of shift with the insert parts.

Contact French engineers with any questions about our Transfer Molding Presses. Read about our 250 ton Automatic Hydraulic Vacuum Press custom designed for cold pot transfer molding.

A Transfer Molding Press Is Best Suited For:

  • Mid range dimensional tolerances
  • Low to medium volume production
  • Small to medium sized parts
  • Delicately shaped parts
  • Low to medium durometer materials
  • Insert molding
  • Colored and translucent compounds
C-frame transfer molding press

C-frame transfer molding press for molding neoprene rubber products

Transfer Molding Press Advantages:

  • Shorter production cycles than compression molding
  • Ability to maintain closer dimensional tolerances than compression molding
  • Excellent uniformity from mold cavity to mold cavity
  • Rapid mold setups
  • Typically less flash than compression because the cavity plates are closed
  • For multi-cavity tools, labor cost is lower than compression since only a single pre-form is necessary.

Disadvantages:

  • Higher Investment Cost than compression (press, tooling and auxiliary equipment)
  • Requires a preform (a pre-measured slug of material)
  • Not well suited for filled materials
  • Generates some amount of material degradation
  • Cannot process high durometer materials
  • Tool maintenance costs are typically higher than compression
  • Wear of cavities is less than injection, but gates and runners erode
  • Labor content typically higher than injection
  • Flash Pad or Pot Pad is excess scrap material

Resin Transfer Molding (RTM) is a low-pressure (typically under 100 psi), closed molding process which offers a dimensionally accurate, and high-quality surface finish composite molding, using liquid thermoset polymers reinforced with various forms of fiber reinforcements.

Processing Applications:

  • Low to medium durometer materials
  • Low to medium production volumes – flexibility with part sizes
  • Small delicate parts

Typical Materials:

  • Epoxy
  • Vinyl Ester
  • Methyl Methacrylate
  • Polyester
  • Phenolic
  • Filled Materials such as with Glass, Arimid, Carbon and Synthetic fibers

Custom Transfer Molding Press Solutions

A rubber transfer molding press is ideal for product consistency, giving you the same specialized form each and every time. Transfer molding presses combine the best features of compression molding with all the advantages of injection molding.

You not only get the dimensional stability and excellent surface finish possible using a compression molding press, but you also get the low cost and high-automation capabilities that make an injection molding press so ideal for today’s rubber molding industries.

Contact a TMP representative for more information on a transfer molding press.

automatic-hydraulic-vacuum-press-e1497640969619_RV

250 ton press for cold pot transfer molding automotive parts

TMP Offers a Wide Selection of Transfer Molding Presses

Need custom automation and material feed flow? Our Techni-Mold custom-built presses are ideal for demanding jobs. Each press is custom-designed for your specific needs then built to spec to suit your needs.

TMP offers you some of the strongest press-building experiences in the industry. In fact, since 1978 we’ve supplied hydraulic presses and automation equipment to hundreds of satisfied customers who return to us again and again for many of our hydraulic presses or rubber mixers. Our clients are some of the best names in the industry, including DuPont, Goodyear, Raytheon, Xerox, Parker, Nelco, Honeywell and NASA, just to name a few.

How a Transfer Molding Press Works

Inconsistencies cost your company money, time and valuable labor. You want the same specialized part each time you make it, whether you are making hundreds, thousands or millions of specially designed parts for your individual job.

Unlike compression molding, transfer molding uses a closed mold. This makes tighter tolerances and more intricate parts consistently achievable. A rubber transfer molding press offers the best of both worlds – quality and precise conformity at an affordable cost.

TMP rubber molding presses offer consistency and efficiency, giving you the quality you desire at the production rates you need. Let us provide you with a rubber transfer molding solution specific to your job, yet affordable enough to purchase multiple units.

Every rubber molding job requires specialized considerations. Based on your product complexities, quantity required, finished part size tolerances, and material costs, we can design a TMP hydraulic press and automation solution to match your specific requirements. Contact us today for a no-obligation assessment of what works best for you.

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