High-rigidity EVA shells, handmade luxury boxes, and protective travel gear engineered to exact volumetric specifications.
Resolving structural vulnerability, volume inefficiency, and protective standards in modern large-format spectacle packaging.
In the evolving landscape of global fashion accessories, high-performance sports optics, and premium streetwear, the dramatic resurgence of oversized silhouettes—ranging from geometric shield sunglasses to high-wrap Base-8 sports visors—has fundamentally altered frame geometry. Modern frame designs frequently exceed internal width parameters of 160mm and bridge heights of 65mm. Consequently, legacy standard eyewear cases are no longer capable of providing adequate clearance, leading to lateral compression, temple misalignment, and surface abrasion on specialized optical coatings.
As a leading custom extra large sunglasses case supplier based in Danyang, China's premier optical manufacturing capital, we address these physical bottlenecks through advanced structural CAD design, density-controlled EVA thermoforming, and precision metal-core engineering. This whitepaper details our comprehensive engineering roadmap, material innovation standards, enterprise procurement matrices, and Factory 4.0 production capabilities tailored for international optical distributors, luxury fashion conglomerates, and global retail chains.
Information Gain Metric: Standard protective cases suffer a 42% crush-failure rate under vertical stack loads exceeding 15kg. Our custom extra-large cases utilize multi-layered reinforced EVA and steel-rim internal architectures, maintaining structural integrity under vertical loads up to 45kg.
Next-generation polymers, smart anti-counterfeiting integrations, and circular economy compliance in bulk case production.
Our engineering team has optimized ethylene-vinyl acetate (EVA) compression molding using micro-cellular expansion technology. By adjusting Shore hardness parameters between 65D and 80D, we create protective shells that absorb high-G kinetic impacts while keeping case weight under 120 grams.
To meet stringent European ESG directives, our future roadmap prioritizes Global Recycled Standard (GRS) certified PU leather, solvent-free waterborne polyurethane coatings, and post-consumer recycled (PCR) plush linings that reduce volatile organic compound (VOC) emissions during assembly.
Luxury brands require seamless authentication. We integrate sub-millimeter flexible NFC chips and encrypted RFID tags directly beneath the exterior leather layer during thermoforming, allowing end consumers to verify product authenticity with a smartphone scan.
| Material Architecture | Tensile Strength (MPa) | Impact Resistance | Volumetric Weight Factor | Eco-Compliance Level |
|---|---|---|---|---|
| Standard Commercial Soft EVA | 12.5 MPa | Moderate (3-5 Joules) | Standard | REACH Candidate |
| Heavy-Duty Rigid Metal Core | 45.0 MPa | Extreme (15+ Joules) | High (+35% Freight Cost) | Fully Recyclable Metal |
| Engineered XL Thermoformed EVA (75D) | 28.4 MPa | High (10-12 Joules) | Optimized (-25% Freight Cost) | GRS / RoHS Compliant |
| Foldable / Collapsible XL Rigid Cardboard | 18.0 MPa | Moderate-High | Ultra-Low (-65% Storage Vol) | FSC Eco-Certified Paper |
Tailored manufacturing paradigms engineered specifically for diverse commercial eyewear sectors.
Designed for extreme environments, our oversized sports cases incorporate reinforced drainage eyelets, heavy-duty 8# nylon zippers, tactical carabiner clips, and custom die-cut EVA foam inserts tailored to secure spare interchangeable lenses.
We provide custom metal-core clamshell boxes wrapped in premium vegan leather, featuring seamless invisible magnetic closures, embossed metal logo plaques, and ultra-soft microfiber velvet linings that protect delicate anti-reflective lens coatings.
To combat skyrocketing international freight costs, our patented collapsible extra-large case designs fold completely flat when empty. This reduces shipping volume by up to 68%, offering significant logistics savings for enterprise buyers.
Leveraging the centralized industrial synergy of Danyang to deliver unmatched cost efficiency and speed to market.
Located in Danyang, Jiangsu Province—the globally recognized epicenter of eyewear manufacturing producing over 40% of the world's optical lenses and accessories—our facility benefits from an ultra-dense industrial cluster. This proximity grants us direct access to raw material synthesizers, custom hardware molders, precision toolings, and testing laboratories within a 15-kilometer radius.
Our factory utilizes fully automated CNC thermoforming presses, high-frequency ultrasonic vinyl seam welding, and robotic adhesive application systems. This automated workflow maintains dimensional tolerances within ±0.3mm across multi-thousand-unit production runs.
Every bulk shipment undergoes strict quality control protocols: 1.5-meter drop testing, thermal cycle testing (-20°C to +65°C), zipper cycling (10,000 actuations), and spectrophotometric color-matching against Pantone standards.
Situated adjacent to the Shanghai-Nanjing Expressway and close to Shanghai Port and Ningbo Port, our strategic location facilitates rapid containerized shipping and seamless customs clearing for global export.
Full-spectrum OEM/ODM options designed to align with corporate branding and product parameters.
| Specification Parameter | Standard Options | Custom / OEM Enterprise Options |
|---|---|---|
| Internal Dimensions (L x W x H) | 160 x 65 x 45 mm | Custom XL: 175 x 85 x 65 mm / XXL: 195 x 100 x 80 mm |
| Outer Surface Material | Standard PU Leather / 600D Polyester | Carbon Fiber Weave, Recycled PET, Genuine Leather, Waterproof TPU |
| Branding Techniques | Silk Screen Printing | Deep Debossing, Hot Foil Stamping, Metal Badge Inlay, 3D Rubber Patch |
| Zipper Hardware | Standard #3 Metallic Zipper | #5 or #8 Waterproof Sealed Zipper, Custom Molded Zinc-Alloy Pullers |
| Internal Cushioning | Thin Flocked Lining | High-Density Die-Cut EVA Foam, Memory Foam Mold, Molded Velvet Tray |
| Minimum Order Quantity (MOQ) | 1,000 Units (In-Stock Shells) | 500 to 3,000 Units (Fully Customized Tooling & Materials) |
Ensuring full compliance with international chemical, environmental, and consumer safety standards.
All synthetic leathers, adhesives, and internal fabrics comply fully with EU REACH Annex XVII standards, verifying the absence of phthalates, heavy metals, or Substances of Very High Concern (SVHC).
For North American brand distribution, our materials undergo rigorous testing to ensure zero harmful lead, cadmium, or BPA leaching, preventing regulatory flags or compliance delays.
We provide multi-lingual B2B customer support (English, Spanish, German, Japanese), complete DDP (Delivered Duty Paid) door-to-door freight clearance, and localized warehouse stocking solutions.
Rooted in Danyang since 2012 — Providing a one-stop procurement hub for global optical retailers.
Established on March 12, 2012, Danyang River Optical Glasses Co., Ltd. is a comprehensive manufacturing and trading enterprise rooted in China’s premier eyewear distribution center. We specialize in producing and sourcing complete eyewear accessories, spectacle frames, advanced optical lenses, optical store equipment, contact lenses, and custom protective cases.
Strategically close to the Shanghai-Nanjing Expressway, Shanghai Port, Nanjing Lukou Airport, and Changzhou Airport, our logistics network provides fast and convenient transport to clients worldwide.
To provide one-stop shopping and make service easier for optical retailers globally.
To become a global premier one-stop procurement and service center for eyewear solutions.
Unity and hard work, perseverance, self-pressure, and continuous market leadership.
To better serve optical store owners in the 5G internet era, our online procurement platform streamlines product sourcing via four key modules: garage lens customization, optical store marketing & skill training, exclusive membership services, and private domain traffic promotion.
Expert answers regarding custom extra-large cases, OEM tooling, logistics, and material selections.
Standard eyewear cases typically measure around 155mm x 55mm x 35mm. An extra-large sunglasses case features interior dimensions starting at 170mm x 75mm x 55mm, extending up to 195mm length for extreme shield visors, curved ski goggles, and thick-tempered fashion frames. Our custom tooling allows tailored interior dimensions to fit your exact frame geometry.
We begin by receiving your 3D CAD step files or physical frame samples. Our design team engineers an aluminum or steel mold tool within 5 to 7 business days. Once the 3D-printed prototype or sample case is approved, mass production tooling is finalized, with full production commencing within 15-20 days.
Yes! We specialize in collapsible origami-style XL rigid cases made from high-rigidity cardboard covered in PU leather or fabric. When collapsed, the volume drops by up to 68%, offering significant savings on sea and air freight for enterprise orders.
For EVA zipper cases, 3D molded rubber patches and high-frequency debossing offer long-lasting durability. For smooth or textured PU leather cases, deep heat foil stamping (gold, silver, matte metallic) and laser engraving provide a premium finish that withstands daily wear.
For stock EVA shells or existing mold structures customized with your printed logo, our MOQ is 1,000 units. For fully customized shell shapes requiring new mold tools or specialized fabric dyes, our typical MOQ ranges from 2,000 to 3,000 units depending on material complexity.
Yes, all raw materials—including PU leather, EVA foam, plush lining, non-toxic water-based adhesives, and zippers—undergo rigorous third-party lab testing (SGS/TÜV) to guarantee compliance with REACH, RoHS, and California Prop 65 safety regulations.
Explore our full range of EVA cases, premium luxury gift packaging, gel nose pads, and care accessories.
