Contents
- 1 How to Print on Plastic Cups:
- 2 Pre-Press Preparation: What You Need Before Printing
- 3 The Printing Workflow: Step-by-Step
- 4 Post-Press Cleanup: Preserving Your Screen for Future Use
- 5 Why Choose Juste Machine for Your Sampling Needs?
- 6 Applications: What Can You Print With This Machine?
- 7 Frequently Asked Questions (FAQ)
- 8 Ready to Start Your Cup Printing Sampling?
How to Print on Plastic Cups:
If you are in the business of custom printed cups, getting the sampling process right is critical. Before you commit to mass production, you need a reliable semi automatic cup screen printing machine to test logo placement, color accuracy, and ink adhesion. A high-quality semi automatic cup screen printing machine ensures consistent results and reduces material waste during sampling. This guide walks you through the entire sampling workflow for plastic milk tea cups, from pre-press preparation to post-print cleanup. Whether you are a small business owner or a production manager, mastering this process with your semi automatic cup screen printing machine will save you time, materials, and frustration.
Not sure which screen printing machine fits your plastic cup? Or need a custom cup mold for your PET Cup, PP cup from 4oz to 32oz?
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In this guide you will learn:
- How to prepare a custom screen with your logo for sampling
- The importance of custom fixtures for different cup shapes
- Step-by-step printing workflow on a cup screen printer
- Proper screen cleaning and storage after printing
Pre-Press Preparation: What You Need Before Printing
Before operating your semi automatic cup screen printing machine, proper preparation is essential for achieving professional results.
Step 1: Create a Custom Screen Plate with Your Logo
Operation: Prepare a screen plate with your logo pattern. This involves coating the screen mesh with photosensitive emulsion, exposing it with your logo film, and washing out the unexposed areas to create a stencil.
Purpose / Principle: The screen plate acts as a stencil that allows ink to pass through only in the logo area. This ensures every printed cup has a sharp, consistent logo image.
Key Points to Note: Choose the appropriate mesh count for your ink type. A lower mesh count (e.g., 110-150) works well for solvent inks, while a higher mesh count (e.g., 200-300) is better for UV inks. Ensure the emulsion is fully dried before exposure to avoid pinholes.
Pro Tip: Keep a record of exposure times for different mesh counts. This speeds up future screen making and ensures consistent quality.
Step 2: Prepare a Custom Cup Fixture
Operation: Machine a custom support fixture that matches the exact shape and taper of your plastic milk tea cup.
Purpose / Principle: The fixture holds the cup securely in place during printing. For conical cups like milk tea cups, a standard cylindrical fixture will not work because the tapered shape requires precise angular contact with the screen. A custom fixture ensures the cup surface contacts the screen at the correct quadrant point.
Key Points to Note: Cylindrical cups use a roller fixture with four wheels. Conical cups require a specially machined support jig mounted on the rotary shaft. Always inform your machine supplier of your exact cup dimensions when ordering.
Pro Tip: If you print multiple cup sizes, invest in a set of interchangeable fixtures. Quick changeover between different cup diameters saves significant setup time during sampling.
Step 3: Select the Right Ink โ Solvent or UV
Operation: Choose either solvent-based ink or UV ink based on your curing equipment and adhesion requirements.
Purpose / Principle: Different inks offer different benefits. Solvent inks air-dry or heat-dry and provide strong adhesion on most plastics. UV inks require a UV curing oven but offer superior scratch resistance and are more environmentally friendly.
Key Points to Note: If you choose UV ink, you must have a separate UV curing oven. The semi automatic cup screen printing machine itself does not include curing functionality. For sampling, solvent ink is often more convenient because it dries without additional equipment.
Pro Tip: Always test ink adhesion on a sample cup before full sampling. Some plastic materials (like PP) require pre-treatment or flame treatment for optimal ink bonding.
The Printing Workflow: Step-by-Step
Now we move to the actual printing process using your semi automatic cup screen printing machine. Follow these steps carefully for optimal results.
Step 4: Set Up the Machine and Load the Cup
Operation: Install the custom cup fixture on the rotary shaft. Mount the prepared screen plate onto the left-right pneumatic cylinder. Adjust the machine height so the cup surface makes proper contact with the screen at the quadrant point. Manually place the plastic cup onto the fixture.
Purpose / Principle: The semi automatic cup screen printing machine uses a rising worktable to bring the cup into contact with the screen. The screen then moves left and right, dragging the cup to rotate via friction. At the same time, the squeegee pushes down to transfer ink onto the cup surface.
Key Points to Note: For conical cups, ensure the fixture is properly centered. For cylindrical cups, verify that all four rollers contact the cup evenly. Improper setup will cause blurred prints or incomplete logos.
Pro Tip: Keep a setup log for each cup type. Record fixture settings, machine height, and squeegee pressure. This makes future changeovers much faster.
Step 5: Start Printing with Foot Switch Control
Operation: Press the foot switch to activate the printing cycle. The worktable rises, the screen moves laterally, and the squeegee applies pressure to transfer the logo. Once the cycle completes, manually remove the printed cup.
Purpose / Principle: The foot switch allows hands-free operation, leaving both hands free to hold and position the cup. The pneumatic system ensures consistent squeegee pressure and screen movement across every print cycle on your semi automatic cup screen printing machine.
Key Points to Note: This is a semi-automatic screen printer. You must manually load each cup onto the fixture and manually remove it after printing. The machine does not have automatic loading or unloading. For multi-color sampling, after printing one color, change the screen and ink, then manually rotate the cup using the gear mechanism to align for the next color.
Pro Tip: Practice the loading-print-unload rhythm before starting actual sampling. A smooth workflow can achieve up to 1500 pieces per hour with an experienced operator.
Post-Press Cleanup: Preserving Your Screen for Future Use
Step 6: Clean the Screen with Screen Wash
Operation: Immediately after printing, remove the screen plate. Apply screen wash (also called screen opener or washout solution) to a soft, lint-free cloth. Gently wipe both sides of the screen to dissolve and remove all residual ink. Rinse with water or blow dry with an air gun.
Purpose / Principle: If ink dries inside the mesh openings, the screen becomes clogged and unusable. Proper cleaning immediately after printing keeps your semi automatic cup screen printing machine ready for future sampling or production runs.
Key Points to Note: Never use aggressive solvents that can damage the emulsion or screen mesh. Always follow the screen wash manufacturer’s instructions. Store cleaned screens flat or vertically in a dust-free area.
Pro Tip: Label each screen with the cup model and logo design. This creates a reusable screen library for repeat orders, eliminating the need to remake screens for the same design.
Why Choose Juste Machine for Your Sampling Needs?
Since 2002, Shenzhen Juste Machine Co., Ltd. has been a trusted screen printing machine manufacturer based in Dongguan, China. Our JST-R300 semi automatic cup screen printing machine is designed specifically for cylindrical and conical products. With a printing speed of up to 1500 pieces per hour, a maximum frame size of 550ร300mm, and pneumatic operation, it offers the perfect balance of affordability and capability for small businesses and sampling labs. Every semi automatic cup screen printing machine we manufacture undergoes rigorous quality testing before shipping.
We support custom fixture machining, OEM branding, and provide comprehensive technical support including video training and manual documentation. Every machine undergoes rigorous quality inspection before shipping from our Shenzhen port.
Applications: What Can You Print With This Machine?
The JST-R300 semi automatic cup screen printing machine is not limited to plastic cups. It handles a wide range of products across multiple industries.
By Material:
- Plastic (PP, PET, PVC, Acrylic)
- Glass
- Metal (Aluminum, Stainless Steel)
- Ceramic, Wood, Bamboo, Silicone
By Industry:
| Industry | Application Examples |
|---|---|
| Cosmetic Packaging | Foundation bottles, perfume bottles, lipstick tubes, lotion jars |
| Food & Beverage | Water bottles, wine bottles, coffee cups, milk tea cups, honey jars |
| Daily Chemicals | Shampoo bottles, shower gel bottles, detergent containers |
| Pharmaceutical | Syringes, reagent bottles, ointment tubes |
By Product Shape:
- Cylindrical bottles and cups
- Conical tapered cups (milk tea cups, coffee cups)
- Oval and square containers (with custom fixtures and flat mode)
This versatility makes the plastic cup screen printer a valuable investment for businesses printing on multiple product lines. Learn more about how to make curved squeegees for different shapes to optimize your printing results.
Frequently Asked Questions (FAQ)
Q: Are you a manufacturer or a trading company?
A: Shenzhen Juste Machine Co., Ltd. has been a direct screen printing machine manufacturer since 2002, with our factory located in Dongguan, China.
Q: Can this machine print on conical cups like milk tea cups?
A: Absolutely. With a custom-machined support fixture, this semi automatic cup screen printing machine handles cylindrical, conical, oval, and even square containers perfectly.
Q: What is the printing speed?
A: The semi automatic cup screen printing machine operates at up to 1500 pieces per hour, depending on operator loading speed and cup size.
Q: Do you provide a warranty and technical support?
A: Yes, we offer a 1-year warranty on all machines, plus lifetime technical support and video training.
Q: How does the machine ensure precise multi-color registration?
A: The machine uses a mechanical gear rack drive for zero-error positioning. You manually rotate the cup using the gear mechanism for multi-color alignment.
Q: Can I use UV ink with this machine?
A: Yes, you can use UV ink. However, UV ink requires a separate UV curing oven. Read our guide on UV Dryer vs IR Dryer to choose the right curing solution.
Q: What is your lead time for a customized machine?
A: Standard machines ship within 15-20 working days. Customized machines with special fixtures require 25-30 working days.
Ready to Start Your Cup Printing Sampling?
Whether you need to sample logos on plastic cups, glass bottles, or cosmetic containers, the right semi automatic cup screen printing machine makes all the difference. Investing in a quality semi automatic cup screen printing machine from Juste Machine ensures your sampling results are accurate, consistent, and repeatable. Contact Juste Machine today to discuss your specific cup dimensions and printing requirements. We will help you select the right machine configuration and custom fixtures for your application.
Not sure which screen printing machine fits your product? Or need a custom fixture mold for your unique bottle shape?
๐ Click my photo below to chat with me directly on WhatsApp โ I’ll send you a free tailored quote within 24 hours.
