Post Molding Operations Service
Post molding operations are the vital finishing touches to your molding which add value, branding or functionality. We offer various turn-key solution for your post molding operations. Our large volume kitting & assembly services eliminate the need for additional vendors in your supply chain by providing single source & cost-effective solutions.
  • Ultrasonic Wedling, Paint, Plating
  • Assembly, Pad Printing, Screen Printing
  • Thermal Transfer Printing, , Spin Welding
  • Laser Carving/Laser Marking, Hot Stamping
  • 24/7 engineering support
  • 20+ years operation experience
Our Types of Post Molding Processes
Ultrasonic Wedling
Vapor deposition
Screen Printing
Pad Printing
Thermal Transfer Printing
Laser Carving/Laser Marking
Hot Stamping
Spin Welding
Ultrasonic Wedling
Ultrasonic welding uses high-frequency vibration waves to transmit to the surfaces of two objects to be welded. Under pressure, the surfaces of the two objects rub against each other to form an instant melt bond between the molecular layers. This bond outperforms chemical and mechanical bonding in terms of production time and strength
Advantages: Clean, fast, efficient, low cost, high welding strength and good sealing
Materials suitable for ultrasonic welding: metal, PP, ABS, PC, PS etc.
Painting is a processing method that uses a spray gun to atomize paint and apply it to the surface of an object. Spray painting may give parts a surface of various colors, increase visual effects, enhance product competitiveness, or be used to increase anti-corrosion capabilities.
Applicable industries: hardware, plastics, furniture, military industry, shipbuilding and other fields
Advantages: efficient, low cost, design can be changed, customizable any pantone colors
Materials suitable for painting: metal, plastic, rubber, wood etc.
Electroplating is a process that uses the principle of electrolysis to plate a thin layer of other metals or alloys on certain metal surfaces. Electroplating can improve wear resistance, conductivity, reflectivity, corrosion resistance and enhance aesthetics.
The part to be plated usually serves as the cathode, which is immersed in a solution containing positively charged ions of the plated metal. When an electric current is applied, the metal ions in the solution are attracted to the surface of the part, forming a uniform coating of electroplated metal on the surface of the part.
Materials suitable for electroplating: metal, plastic
Vapor deposition
Vapor deposition is a manufacturing process that involves the conversion of a material into a vapor phase, followed by the condensation and deposition of this vapor onto a substrate to form a film or coating. It is commonly used in the production of thin films for various applications, including electronics, optics, and decorative finishes.
Screen Printing
Screen printing is the process of using a screen, ink and a squeegee to transfer a design onto the surface of a part. The basic process of screen printing involves passing the photosensitive platemaking method over the screen to create a screen template with graphics and text, and then pushing the ink onto the surface of the part below to create the design.
Advantages: efficient, low cost, design can be changed, customizable any pantone colors
Materials suitable for Screen Printing: metal, plastic, fabric, wood, paper
Pad Printing
Pad printing usually uses steel to make gravure plates, and uses a curved pad printing head made of silicone rubber to dip the ink on the gravure plate onto the surface of the pad printing head, and then press it heavily on the surface of the injection molding part, that is, to complete the required text, Pattern printing process.
Advantages: efficient, low cost, design can be changed, customizable any pantone colors
Materials suitable for Screen Printing: metal, plastic, fabric, wood
Thermal Transfer Printing
Thermal transfer printing involves the process of pre-printing the pattern on the surface of the film, and then transferring the exquisite pattern on the transfer film to the surface of the product through a heat transfer machine. The transferred ink layer is integrated with the surface of the product and has high strength, wear-resistant.
Advantages: efficient, low cost, design can be changed
Materials suitable for Screen Printing: metal, plastic, wood
Laser Carving/Laser Marking
Laser marking is a marking method that uses high-energy-density laser to locally irradiate the workpiece to vaporize the surface material or cause a chemical reaction of color change, thereby leaving a permanent mark. Laser marking can produce various texts, symbols and patterns, and the character size can range from millimeters to microns.
Advantages: efficient, low cost, design can be changed
Materials suitable for electroplating: metal, plastic, wood, paper
Hot Stamping
The hot stamping process uses the principle of hot pressure transfer to transfer the aluminum layer in anodized aluminum to the surface of the substrate to form a special metallic effect. Since the main material used for hot stamping is anodized aluminum foil, hot stamping is also called anodized aluminum foil.
Advantages: efficient, low cost, customizable colors(Gold, silver, laser gold, laser silver, black, red, green...)
Materials suitable for Screen Printing: plastic, fabric
Spin Welding
Spin welding, also known as spin-melt plastic welding, uses the heat generated by the mutual friction of plastic workpieces to melt the contact surfaces of the plastic workpieces, and then adheres and solidifies the upper and lower workpieces into one body under the action of external force, forming a permanent fusion.
Advantages: Clean, fast, efficient, low cost, high welding strength and good sealing
Materials suitable for Screen Printing: plastic
As a single source, we assist our customers with the assembly of plastic molded components. Assembly can be by snap-fitting, screw fastening, adhesives, welding or other post-forming operations.
Why Choose Us
for Post Molding Operations?
High Quality
Strict quality management ensures consistently high quality. First article inspection, walk-through inspection and finished product inspection ensure your parts meet specifications and are defect-free.
Multiple post molding treatment
We offer a variety of post molding operations include: electroplating, sand blasting, painting, printing, laser etching, ultrasonic welidng, hot stamping, spin welding, etc.
Fast Delivery
Our post molding operations have fast processing capabilities and shorter turnaround times to help customers gain a time advantage, with small batch production taking just one day and high-volume production taking just 2-3 weeks.
Our fast processing capabilities, advanced machines, and experienced team are enough to ensure that your parts strike a balance between quality, efficiency, and cost, providing customers with cost-effective parts.
Gallery of Post Molding Operations Parts
View the custom post molding metal and plastic products we’ve produced for our customers.
Hear From Our Customers Saying About Us
A customer’s words have a more substantial persuasion than a company’s claims. We have served hundreds of satisfied customers and here are some reviews they give us.
Mark Caldwell
Director of Strategic Purchasing
When we needed to significantly increase production of one of our plastic components, their production planning team was able to smoothly ramp up capacity within a few months to meet our accelerated schedule. Their scaling ability and responsiveness helped us avoid potential stockout issues.
James Mauro
Project Manager
After years of partnership, their customer service and technical support staff truly understand our business needs. Any questions or issues are addressed meticulously and promptly, often with proposed solutions, which saves us countless hours of troubleshooting ourselves.
Katharina Haderlein
Director of Product Development
A recent audit of their quality management system reassured us of their stringent process controls and record keeping. The comprehensive documentation provides visibility into every manufacturing step from material to finished part. This level of transparency is appreciated.
Greg Benson
Purchasing Engineer
I'm consistently impressed by their dedication to continuous improvement. Plant upgrades and new technologies are regularly implemented, keeping their operations highly efficient. Most impressive is how these changes never disrupt ongoing production.
John Fay
Product Designer
The training opportunities provided to staff earn my respect. I believe companies with leading health and safety standards, such as I've observed here, cultivate not only top talent but also accountability at all levels of the organization. This caliber of workforce contributes greatly to their success.
Post Molding Operations FAQs

What is the difference between water transfer printing and heat transfer printing?

Water transfer printing and heat transfer printing are both methods of transferring patterns or text to the surface of injection molded products. Water transfer printing is to soak the transfer film with patterns or text in water, then stick it on the surface of the product, and transfer the pattern or text to the product through water pressure. Thermal transfer printing is to heat the transfer film with patterns or text and stick it on the surface of the product, and transfer the pattern or text to the product through high temperature.

What post molding operation services can you offer?

The post-molding services we can provide include: electroplating, spray painting, silk screen printing, pad printing, thermal transfer printing, hot stamping, ultrasonic welding, electroplating, spin welding, assembly, etc.

What are the types of printing for plastic products?

Commonly used plastic parts printing include silk screen printing, pad printing, heat transfer printing, hot stamping, etc.

What are the methods for painting plastic parts?

1. Hand spraying

The surface of the product is directly sprayed with oil through manual operation. It is currently used for manual spraying of defective products after automatic spraying.

2. Fully automatic spraying

The products that need to be sprayed are fixed on the rotatable bracket, and then the bracket is locked on the assembly line, and then the assembly line is moved at a fixed rate and the rotatable bracket is rotated continuously to achieve 100% uniform spraying on the product surface.

How does screen printing work?

Screen printing is a popular printing technique used to transfer ink to a variety of surfaces, such as fabric, paper, glass, and plastic. It is widely used in the production of textiles, posters, signs, promotional items, etc. The process involves the following steps:

Step 1: Make a screen printing plate: According to the product requirements, design the screen printing plate and produce a screen printing plate that meets the requirements.

Step 2: Determine the printing process parameters: According to the product material and specifications, determine the appropriate printing process parameters, including screen mesh number, screen material, printing speed, printing pressure, drying method, etc.

Step 3: Prepare the screen printing machine: Prepare the screen printing machine according to the printing process parameters, and perform necessary debugging and calibration.

Step 4: Screen printing: Place the screen printing plate on the screen printing machine, pour the ink onto the screen printing plate, and print through the screen printing machine to evenly print the ink on the surface of the product.

Step 5: Drying: According to the product material and specifications, use appropriate drying methods to quickly dry the printed ink.

Step 6: Quality inspection: Conduct quality inspection on printed products, including printing accuracy, printing effect, ink adhesion, etc.

Common plastic products painting defects and solutions

These are some common defects we have summarized based on our 15 years of experience in plastic products painting:


1. Phenomenon: Granulation

Reasons: The work site is unclean and dust is mixed into the paint; the paint is left for too long after being mixed, and the paint and curing agent have produced copolymerized particles; the oil output of the spray gun is too small and the air pressure is too high, resulting in poor atomization of the paint or the spray gun is away from the surface too close

Solution: Clean the spray booth and cover the paint bucket; the paint is well mixed and should not be left for too long; adjust the spray gun so that it is in the best working condition and make sure the distance between the gun muzzle and the object surface is 20-50CM.

2. Phenomenon: vertical flow

Cause: Excessive diluent makes the paint viscosity too low and loses viscosity; the oil output is too large, too close to the object surface or the spray operation is too slow; the amount of oil sprayed each time is too thick and too thick or the interval between re-spraying is too short; the object surface Uneven, especially streamlined shapes that tend to sag.

Solution: Proportion as required; control the amount of oil output to ensure that the spray distance is increased; increase the operating speed of the spray gun; each spray should not be too thick, and it is best to control the interval of spraying in two sprays; control the amount of oil output to reduce the thickness of the paint film; press Instructions for use ratio.

3. Phenomenon: orange peel

Reasons: Too much curing agent causes the paint film to dry too quickly and reacts violently; the spraying air pressure is too high, causing the paint film to wrinkle and become unable to level; the temperature at the job site is too high, causing the paint film to react violently

Solution: Follow the instructions for use; adjust the air pressure, not too high; pay attention to the temperature on site, and add slow-drying diluent to inhibit the drying speed.

4. Phenomenon: whitening

Reason: The temperature and humidity at the job site are high, and the paint film reacts violently, which may combine with moisture in the air to cause whitening; excessive curing agent, too much and too thick a spray at one time

Solution: Pay attention to the humidity on site, and add anti-whitening water to prevent the whitening phenomenon from occurring; adjust according to the proportion, and do not spray too thickly at one time

5. Phenomenon: Blistering

Original solid: water is mixed into the paint film in the compressed air, the temperature at the job site is high, and the paint dries too quickly; the moisture content of the surface is high, and the air humidity is high; one spray is too thick

Solution: Separate oil and water and pay attention to drainage; add slow-drying thinner; clean the surface and add anti-white water to the paint; it should not be too thick at one time

6. Phenomenon: Shrinkage

Reason: The primer or intermediate coat is not dry before applying the topcoat.

Solution: Spray according to the recommended thickness of each sweep gun spray coating

7. Phenomenon: Wrinkling

Reasons: The drying time is too short or the paint film is too thick; the curing agent in the primer or putty is improperly selected; the primer putty is incomplete; the gun is too thick when spraying the topcoat, and the internal deep agent does not evaporate in time, causing the outside to dry out and the inside to dry out. Don’t do it.

Solution: Allow sufficient drying time between each coat; only spray the second coat or spray wet after it is dry.

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