Silicone Rubber & Plastic Parts Manufacturing Process:

Kingtom is a leader in the custom manufacturing of silicone rubber and plastic products.With our rich experience in the silicone rubber and plastic molding industry, we have comprehensive knowledge surrounding all areas of material molding materials, techniques, and components.  So Kingtom is equipped to assist all customs with the design and manufacturing of any component.  Our silicone rubber and plastic parts manufacturing process will meet and exceed performance standards for your application.

After receive customers orders,then we base on 3D drawings to open mold, need about 25-30 days,The samples checking can ship to you or by take photos are ok, after checking the quality,if no problem,then can begin the production.if have any need to modify,we can do for worries.We also can arrange the shipment for you,or you use your shipment agent are ok.We also provide the after-sale customer service,when you receive products,any questions please feel free to contact us.

Kingtom offers the following manufacturing processes:

Injection Molding Compression 

Molding Transfer Molding 

Rubber Extrusion

Rubber to Metal Bonding

The injection molding manufacturing processes:

The injection molding process begins with preparation of materials. Placement of uncured materials in the machinery with a screw feeder system. This process requires no preforming. Machinery uses the screw feeder to bring in as much material as necessary for the mold.  This eliminates any uncertainties and, the production of material waste. Moving material into the barrel, in which is it heated for pliability and pushed into the runner system. Material begins filling the mold cavities and begins the curing process. Upon completing the curing process, the components can be removed to make room for the incoming materials.

A efficient process

Full automation is available

Provides high-tolerance, precision molded products

The best process for consistency and repeatability

Allows for molding of complex geometry

Ideal for rubber to metal bonding,  insert molding and over-molding

Color molded rubber

Lower cost

Eliminates preforms and preform labor cost

Flashless molding / flashless tooling / eliminating secondary trimming

Rapid cavity filling

Reduced cycle time

Minimal material waste

Injection Molding Disadvantages

Higher start-up/shutdown costs

The Compression Molding Manufacturing Process:

Operators discern the amount of material necessary for filling each cavity.

Operators then preform the uncured rubber to these measurements.

Placement of the material into the mold cavity.

Closing the mold over the materials.

Applying heat and pressure to the material for a specific amount of time depending on the materials and components.

Opening the mold and removing the fully cured component.

Overflow material or flash can be trimmed by hand or by a deflasher.

Lower cost molds

Tooling savings

Short setup time (saves on short production runs)

The capacity to process stiff, high durometer materials

Ideal for large parts that require a long cure time

Maximized cavity count

Ideal for low volume part requirements

Ability to process most elastomers and cure systems

Disadvantages of Compression Molding

Longer cycle times

Mid-range precision and consistency

Labor intensive

The Transfer Molding Manufacturing Process:

Operators discern the amount of material necessary for component.

Operators preform the materials with these measurements.

Placement of preform into part of the mold.

Close mold and apply pressure.

Pushing of materials through small opening known as a sprue.

Material fills the mold cavities.

Further heating and application of pressure to mold while the materials cures.

Release of mold and removal of components.

Overflow material or flash is removed.

Advantages of Transfer Molding

Low cost molds

Ideal for molding complex components

Able to maintain high tolerances

Reduced material waste

Cost-efficient tooling and part repeatability

Higher cavity count to simplify and minimize preforms

Capable of creating overmolded parts

Ideal for the production of high precision components

Rubber Extrusion Process:

Designers and operators decide whether hot or cold extrusion is appropriate. 

Feed the unvulcanized rubber into the hopper.  A hopper is a container within the conveyor. 

Gravity then helps send the rubber through the bottom of the hopper and onto the conveyor. 

Conveyor moves the rubber to the die while a screw creates heat and pressure. 

At the end of the conveyor, the softened rubber passes through the die’s opening. 

Inside the die, the rubber begins to take shape. 

The rubber then passes through the die as a completed component shape. 

Operators decide which post-processing methods are best for the component.  These processes include: vulcanization, drilling, coiling, dusting and more.  Vulcanization is a necessity in rubber extrusion post-processing.

The Rubber to Metal Bonding Process:

First, we degrease and clean off any contaminants 

We then spray a special, heat-activated adhesive onto the metal components. 

Once the part is prepared for rubber overmolding, we insert the parts into the mold cavity.    When molding a specific area, special magnets hold the part in place.   During complete encapsulation, chaplet pins hold the part 

Then we close the mold and the rubber molding process begins. 

High molding temperature cures the rubber and also activates the adhesive, which forms a mechanical bond of rubber to metal or bonds rubber to plastic. 

Rubber to metal bonded parts range in size from smaller inserts to larger components.   Overmolded components are also applicable in a wide variety of applications and industries.

Quality & Service 

Kingtom is committed to pursuing the best technology and resources available in the industry to design, engineer and manufacture superior molded products can meet all customer requirements for quality and service. 

From Start To Finish 

From natural rubber to synthetic using a variety of processes, Kingtom’s knowledgeable staff can help customers choose the right process, materials, and mold design for their molded products,provide a high-quality product at an affordable price.


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