Rubber Transfer Molding

The rubber transfer molding process is ideal to produce both solid rubber parts, rubber part with inserts and parts that require bonding rubber to metal. Rubber transfer molding combines the advantages of injection rubber molding with the ease of compression molding. Transfer molding is the ideal process for forming rubber products that require:

  • Exact positioning
  • Bonding rubber to fragile metal parts – such as wire
  • Mold designs that contain multiple cavities and can trap air
  • Intricate parts with lower volume requirements

The Rubber Transfer Molding Process

The process of transfer molding involves pushing unvulcanized rubber through sprues into a heated mold. Similar to compression molding, transfer molding requires raw material preparation into pellets and/or pre-forms.

Rather than placing the preform in the mold cavity, the rubber pre-form is placed in a chamber “pot” at the top of the mold then placed in a press. In the pot, the material is compressed by a heated plunger and transferred through sprues into the cavity below.  The plunger is kept in place until the preform takes on the shape of the mold and the rubber is vulcanized.  The part cures, hardens, cools, then is ejected. Excess cured rubber left in the pot, is removed, mold cavities are cleaned and the next molding cycle begins.

When transfer molding is used for rubber to metal bonding or over molding, the components are loaded into a heated mold either by hand or using a loading fixture.  Material is loaded into the well pot of the transfer mold.  The mold closes and the heated rubber is then transferred through the runner and gate sprues into the mold cavities and around the metal insert.  Under pressure and elevated temperatures, the rubber cures/vulcanizes and parts are removed.

The rubber transfer mold consists of a piston, well pot, sprue plate, cavity plate, and a base plate with a knock-out system used to eject the parts after molding.

Advantages of the Rubber Transfer Molding Process

Transfer molding offers several advantages over other methods by providing:

  • Shorter production cycles
  • Maintains closer dimensional tolerances than compression molding
  • Provides uniformity
  • Fast mold setup
  • Economical process with high cavity count per mold per cycle
  • Cost effective tooling
  • Allows for rubber to metal bonding
  • Allows for rubber overmolding
  • Allows for  design flexibility, sharp edges and intricate parts

Disadvantages of Rubber Transfer Molding

  • Complex molds that are more expensive than compression molding
  • Longer cycle times
  • Labor intensive
  • Increased mold maintenance
  • Increased flash and waste

Transfer molding is an ideal process to not only produce precision molded rubber products, but also products that require rubber bonded to metal surfaces.

Rubber Transfer Molding combines the advantages of injection molding with the ease of compression molding. Rubber transfer molding is the ideal process for forming parts that require:

  • Exact positioning
  • Bonding rubber to fragile metal parts – such as wire
  • Mold designs that contain multiple cavities and can trap air
  • Intricate parts with lower volume requirements

Qualiform molds both natural rubber and synthetic rubber which include:

  • Butyl
  • Colored Compounds
  • EPDM
  • Natural Rubber
  • Neoprene
  • Nitrile
  • SBR
  • Viton™
  • Fiber Molding

Transfer Molding Design and Material Consultation

Our technical staff is available to answer any questions call (330) 336-6777, or submit a question through our Contact Form or Send Us a PDF.

Qualiform Rubber Molding Information

Qualiform is one of the top US companies in the rubber molding industry. We create custom products using unique designs and special compounds. Our experience in rubber molding and rubber-to-metal bonding is unparalleled, giving us the problem-solving abilities to tackle specific molding challenges.

Qualiform is a certified ISO 9001:2015 company. We provide our customers with excellent service and the highest quality custom rubber-molded products, to ensure all of their specific needs are met. Contact Qualiform Rubber Molding if you are in need of any assistance with product development. Our expertise includes a variety of molding services including, injection molding, compression molding, transfer molding, and rubber-to-metal bonding.

Our expert staff will be available to assist you throughout the entire design and development process. We will work diligently to ensure each product meets your needs and specifications. At each step of your product’s development, our staff will be by your side ensuring the materials and product quality are to your satisfaction.

Qualiform Quality Assurance Program

Qualiform Rubber Molding is an ISO 9001:2015, and we are dedicated to employing the most effective quality assurance program. Every aspect of our molding process is overseen, evaluated, and documented by this program. This allows us to comply with customer requirements and ensure satisfaction with each product and service we offer.

Competitive Pricing for Rubber Transfer Molding

Qualiform evaluates every aspect of part production to maintain competitive pricing. We examine each product to create the best solutions and prices through R&D, design, engineering, or manufacturing.

Experienced Work Force

With 130 years of experience in all areas of the rubber molding industry, our leadership team is capable of providing the best service possible. At Qualiform, we consider each employee an extremely valuable asset. Therefore, we invest in the skill sets and expertise of our employees. This reinforces top quality products, employee leadership, and job performance.

Customer Service

Here at Qualiform, we provide customers with dependable and considerate communication. We follow-up with all our customers to make certain they know the exact details of each step of the production process.

What’s the process to get a quotation?

To get a quote, please provide us with a sample or print of your part for us to review. Also, please make sure you include the estimate of your annual usage requirements to assist us in the tooling design. In addition, please include the type of material, unless it is unknown or unspecified. In that case, describe the environment in which the tooling will be utilized.

Can Qualiform assist with the design of my custom rubber transfer molding part?

Qualiform can be there to assist you from the initial design phase to the final approval of your part.

What if I don’t know which polymer or durometer is best suited for my application?

With 32+ years of rubber molding experience, Qualiform is able to offer expert recommendations for polymers and an indication of your durometer requirements.

What is the lead-time when I place an order that requires a tool?

The average lead-times for prototype tools is 2-4 weeks. For compression or transfer tooling it’s 6-8 weeks and for rubber injection molding it’s 8-10 weeks. However, in case your situation requires improved tooling lead time, we are able to work without tooling shop to meet specific customer requirements.

Is my tooling manufactured in the United States?

All of our tooling is purchased in the United States, which allows for faster responses to customer changes and faster lead-times.

What is Qualiform’s part lead-time?

Depending on the quantity of your order, most parts can be shipped within 3-4 weeks from receipt of order.

Can Qualiform use existing tooling?

In most cases, tooling will fit into our presses. However, in some situations, minor tooling modification may be required.

Once I pay for the rubber molding tooling, who owns the tooling?

Tooling is custom to each customer’s specific design, therefore, the tooling is the property of the customer after we receive payment for the product.

For rubber to metal bonding applications, can Qualiform source my metal components?

In order to source required metal stamping or insert, we work with an array of supply chains.

Can Qualiform match my custom color requirements?

We are able to match any customer requested color, by working with rubber suppliers to provide color matches.

Our Capabilities

Qualiform has the experience and the knowledge to complete your custom rubber molding project needs. In business since 1976, Qualiform has built its enviable reputation on superior quality and a solid commitment to customer service.  Our offerings include rubber compression molding, rubber transfer molding, and rubber injection molding. In addition, we have an extensive line of services, such as color compounds and rubber to metal bonding. Our range of capabilities means we are positioned to provide the custom molded rubber products you require.

From Design through Inspection

From start to finish, Qualiform will produce your design with top-notch customer service. We create quality custom transfer molding, rubber to metal bonding, custom injection molding, and rubber compression molding. We have the ability to complete jobs other manufacturers would fall short in, due to our extensive manufacturing capabilities.

Our Specialties

Our services include custom rubber transfer molding, custom rubber injection molding, rubber to metal bonding, rubber parts manufacturer, custom rubber molding, custom rubber compression molding, rubber parts manufacturer, rubber products manufacturer.

Questions?

Our technical staff is available to answer any questions call (330) 336-6777, or submit a question through our Contact Form or Send Us a PDF.

Transfer Molding
Our technical staff is ready to assist you with all your custom rubber molding needs.

Transfer molded EPDM latches.

Neoprene transfer molded eye protection product used on top of antenna.

Feet for application use on bottom of Red Box DVD machines.

Custom dental grips with numerous color options available.