The difference between acetate frames and PC injection frames
2021-12-29
Plastic frame can be divided into injection frame and plate frame according to different manufacturing processes. Plastic frame is a kind of spectacle frame whose main part is made of plastic or similar polymer material. According to its temperature properties, it can be roughly divided into two categories: thermoplastic and thermosetting resins. Thermoplastic resin can be repeatedly heated and reshaped. Frames made of such materials are easy to adjust and reshape. Thermosetting resins are difficult to reshape after being formed, so they are often mixed with thermoplastics.
So, what's the difference between a sheet spectacle frame and an injection molded spectacle frame? The injection frame is made of resin pellets, which are injection molded by a mold after being heated and melted. The manufacturing process is simple and the production cost is low. The disadvantages are easy deformation, low tensile and compressive strength, and uneven size of the assembled lens. Due to the shrinkage of the material from the heat to the cold process, the different structural dimensions lead to the generation of internal stress. At the same time, the material melts in the cavity of the mold. Directional flow, the bonding strength between the molecules at the fusion is low. These positions are prone to damage and have a great impact on the strength of the frame. The plate frame is made of resin plates, which are processed by a milling machine for more than 100 processes such as inner turning, groove milling, outer turning, turning and milling, shaping, polishing, surface treatment, and printing. The production process is complicated and the cost is high. The lens frame has high strength, is not easy to be deformed, the size of the lens groove is uniform, and the adjustability is good.
The identification of PC injection frame and acetate frame can generally be done by observation. The products of the two processes have the following differences: First, usually the injection frame will produce obvious line marks at the joint gap of the mold, commonly known as the parting line, usually in the mirror and mirror. The center of the edge of the leg.
Second, since the material is in the injection molding process, from hot to cold, sink marks will be generated in places with larger geometric dimensions. Compared with certain angles of light, it is not difficult to find these sink marks.
So, what's the difference between a sheet spectacle frame and an injection molded spectacle frame? The injection frame is made of resin pellets, which are injection molded by a mold after being heated and melted. The manufacturing process is simple and the production cost is low. The disadvantages are easy deformation, low tensile and compressive strength, and uneven size of the assembled lens. Due to the shrinkage of the material from the heat to the cold process, the different structural dimensions lead to the generation of internal stress. At the same time, the material melts in the cavity of the mold. Directional flow, the bonding strength between the molecules at the fusion is low. These positions are prone to damage and have a great impact on the strength of the frame. The plate frame is made of resin plates, which are processed by a milling machine for more than 100 processes such as inner turning, groove milling, outer turning, turning and milling, shaping, polishing, surface treatment, and printing. The production process is complicated and the cost is high. The lens frame has high strength, is not easy to be deformed, the size of the lens groove is uniform, and the adjustability is good.
The identification of PC injection frame and acetate frame can generally be done by observation. The products of the two processes have the following differences: First, usually the injection frame will produce obvious line marks at the joint gap of the mold, commonly known as the parting line, usually in the mirror and mirror. The center of the edge of the leg.
Second, since the material is in the injection molding process, from hot to cold, sink marks will be generated in places with larger geometric dimensions. Compared with certain angles of light, it is not difficult to find these sink marks.
VIP Room
How to check the eyewear workmanship from a professional point of view
Related Article
In the modern eyewear industry, acetate glasses frames are widely used for both optical frames and sunglasses due to their premium look, rich color options, and superior durability. Focus Eyewear offers a full range of acetate eyewear and sunglasses collections. We source acetate from trusted partners such as Aurochim in Italy and JIMEI in China, ensuring consistent quality, stable material performance, and support for both designer and large-scale collections.
Why Eyewear Brands Choose Acetate Frames: Italian vs Chinese Acetate Materials
HK FOCUSEYEWEAR passes ISO 13485 audit for OEM eyewear manufacturing, strengthening quality management systems and supporting global eyewear brands.
HK FOCUSEYEWEAR Successfully Passes ISO 13485 Audit, Strengthening Quality Management in Eyewear Manufacturing
As we step into 2026, we would like to take this moment to reflect on the past year and express our sincere appreciation to all partners who have walked alongside FOCUSEYEWEAR.
FOCUSEYEWEAR New Year Message 2026
FOCUSEYEWEAR Co., Ltd is proud to announce that we have officially received the prestigious NBCUniversal (NBCU) Waiver Approval for another year. This significant achievement recognizes our dedication to manufacturing high-quality, safe, and sustainable eyewear, and confirms our leading position in the Chinese eyewear industry.
FOCUSEYEWEAR Co., Ltd Achieves NBCU Waiver Approval for Excellence in Eyewear Manufacturing