In the fast – paced world of mobile accessories, the demand for high – quality phone case injection moulds is on the rise. At Elite Mould Tech, we stand as industry leaders, leveraging our extensive experience and cutting – edge technology to deliver top – notch Mold design guide for injection mould for Phone Case.

iPhone and Samsung Series​

Our proficiency in phone case injection molding is truly remarkable. We have successfully catered to a wide range of models, spanning from iPhone 11 to iPhone 17 and Samsung 23 to Samsung 56. Whether it’s the ultra – precise solic process or the advanced overmolding technique, we’ve got it covered.​

mobile phone cases are crafted from three distinct plastic components, each playing a vital role in combining protection and aesthetics seamlessly.​

Transparent Backplate

Made from high – quality PC, the 2 – 3mm transparent backplate offers unparalleled clarity, showcasing your phone’s original design. PC’s excellent drop and heat resistance ensure the case remains intact even in harsh conditions, like being left in a sun – baked car. We have different solution on the PC backplate material, PC 110 is the most common material we used for the phone case current project. More material datasheet also can review from :

A special design note on the back plate is all surface need to be nanodotted surface,so that the phone donot get sauction on the phonecase. It is helpful for the phonecase teel off.

The nanodot pattern must be machined into the tool according to the following dimensions! The following approx dimensions are for reference!

• Vertical spacing: ~0,46 mm
• Horizontal spacing: ~0,46 mm
• Dot diameter: ~0,13-0,14 mm
• Dot depth: ~0,03-0,05 mm

Gate location and size

• The following dam type and placement are preferred. Deviations are possible upon request! The most important aspect is that it must be removable with automatic cutting. It is a plus if it can be broken by hand, but this is not strictly necessary.
• Depending on the plate thickness, the preferred gate side is 14mm X 1,2 mm.

Vacuum Suction

To fix the backplate in the mold until the co-molding happens we would like to use vacuum suction! Must not leave any remaining mark!

Enveloping Frame

The frame tool encloses the backplate, and the manufacturing process is done using over-molding injection technology!

• TPU frame over-molded with PC backplate!
• Separate mold for matt and transparent frame!

General summary of the key defining parameters of the frame tool

The special points for the frame injection mould is the ejection and injection runner. As we need automatic production for the 3 plate cold runner, the runner also elastic.

The difficult for the frame mould is the split line always have strict requirements for top brand. The plastic frame have at least 4sliders, some time many brand have 8 sliders from direction. All slider have to be make mirror polish with special design jig,so that there is no step before the texture.

• Inner Drop X

The dropX tool encloses the backplate + frame, and the manufacturing process is done using over-molding injection technology!

• TPE dropX over-molded with PC backplate + TPU frame!

General summary of the key defining parameters of the dropX tool

CMF section of FULL-SHOCK dropX

The surface structure of the dropX shock-resistant layer depends on the type of Full-Shock case. Polished white dropX TPE layer is used for matte frames. However, this may vary occasionally. In all cases, it is necessary to check the attached specific CMF in detail.

Mold Design and Preparation​

Our team uses UG to create precise 3D models. We focus on every detail, ensuring the mold cavities for PC backplate, TPU frame, and TPU Inner Drop X meet strict standards.​

High – precision milling machines are employed to create intricate features like camera cutouts and button holes, achieving tolerances as low as 0.005mm. Conformal cooling channels are integrated into the mold design to ensure even cooling, reducing production time and preventing warping or sink marks. Before injection, molds are thoroughly cleaned and pre – heated to ensure perfect material adhesion.​

Rigorous Quality Control at Elite Mold Tech​

Quality control is at the heart of our manufacturing process. We adhere to strict international standards like ISO 9001 and have developed customized inspection protocols for mobile phone case overmolding.​

Inspection Standards and Protocols​

Raw materials undergo a series of tests, including melt flow index testing, tensile strength checks, and colorfastness tests. For molded parts, we set tight dimensional tolerances. For example, the PC backplate thickness tolerance is ±0.05mm, and camera cutout alignment is within ±0.1mm.​

Advanced Inspection Equipment​

We use cutting – edge equipment for inspections. Coordinate measuring machines (CMMs) with touch – probe and laser scanning technologies accurately measure dimensions. Automated optical inspection (AOI) systems quickly detect surface defects, and X – ray imaging reveals internal flaws, ensuring the integrity of material bonds.​

Quality Issue Analysis and Corrective Actions​

When a quality issue occurs, our engineers use root cause analysis methods like the 5 Whys and fishbone diagrams to identify the problem’s source. Corrective and preventive actions (CAPAs) are then implemented, such as modifying the mold design or adjusting injection parameters. Additional tests are conducted before resuming production.​

Quality Traceability​

Every phone case has a unique identification number, allowing us to track its production journey from start to finish. This traceability system enables us to quickly address any issues in the field, ensuring customer satisfaction.​

After overmolding, each case goes through visual inspection, dimensional measurement, and functional testing, including drop tests, grip checks, and compatibility tests. Only cases that pass all these tests are approved for shipment.​

Overcoming Challenges in Overmolding​

Manufacturing high – end mobile phone protective overmolding molds comes with its challenges, which we’ve overcome with our expertise:​

• Aesthetic Perfection: Our side core – pulling machining and mold fitting precision of 0.005mm ensure invisible and intangible parting lines, enhancing product quality.​
• Quality Assurance: Our technicians optimize every aspect of the injection process to prevent sink marks and flash.​
• Innovative Design and Efficiency: Features like optimized venting systems and automation solutions set our molds apart in terms of cycle time and performance.​
• Meeting Tight Deadlines: Our streamlined project management system ensures molds are mass – produced before mobile phone launches, meeting client deadlines.​

Comprehensive Post – Processing Solutions​

In addition to mold manufacturing, we offer a full suite of post – processing services, including painting, CNC machining for wireless charging slots, silk – screening, and aluminum button machining. Our one – stop approach saves clients time and resources.​

Partner with Elite Mold Tech​

By partnering with Elite Mold Tech, you gain access to top – brand manufacturing experience. Our solutions eliminate mold – related inefficiencies, saving costs and boosting productivity. Whether you’re a startup or an established brand,take the first step towards superior mobile phone case manufacturing with us by contact us by contact@elitemoldtec.com  or whatsapp: 008615019487110​

Checked some of our cases on phone case mould here