Injection Mould For Eyewear Frames

Injection Mould For Eyewear Frames refers to a customized mould specially designed for producing plastic eyewear frames (components such as lens rims, temples, and nose pad brackets) through the injection molding process. Its core function is to inject molten eyewear frame-specific plastics such as TR90, PC, and ABS into the mould through precision cavities and gating systems, forming eyewear frame components that meet ergonomics and high dimensional accuracy (tolerance ±0.02mm). Compared with traditional metal eyewear frame moulds (complex processing and high cost), injection moulds for eyewear frames can realize the integrated molding of complex curved surfaces (such as lens rim curvature and temple bending curve) and functional structures (such as hinge mounting holes and nose pad card slots), with high production efficiency (multi-cavity design, single-mould production cycle 15-25 seconds). It is widely used in the mass production of plastic eyewear frames such as myopia glasses, sunglasses, and sports goggles.

P&M Injection Mould For Eyewear Frames Introduction

1 Core Characteristics of Injection Mould For Eyewear Frames

1. Dimensional Accuracy Control: The inner diameter tolerance of the lens rim is  ±0.02 mm (to ensure adaptation to lens size), the temple length deviation is ≤0.1mm (to adapt to people with different head circumferences), and the nose pad bracket spacing error is ≤0.05mm (to avoid pressing the bridge of the nose when wearing);  the cavity surface roughness Ra≤0.012μm, ensuring the molded eyewear frame surface is smooth and scratch-free without additional polishing;

Curved Surface Fitting Design: The lens rim adopts an aspherical cavity design (curvature error ≤0.5 °) to fit the contour of the eyeball;  the cavity of the temple bending section is designed according to the side curve of the head (curvature radius deviation ≤0.1mm), fitting the contour behind the ear when worn, with uniform pressure distribution (pressure per unit area ≤0.3kPa);

Symmetry Requirements: The symmetry error of the left and right lens rims and temple cavities is ≤0.03mm, ensuring the left-right weight deviation of the molded eyewear frame is ≤0.5g to avoid tilting when worn.

2. Integrated Molding of Multiple Components, Simplifying Assembly

The eyeglass frame is composed of multiple components, and injection molds can achieve integrated molding of some components, reducing subsequent assembly processes:

Integration of mirror ring and nose support bracket: The mold cavity designs the mirror ring and nose support bracket as a whole structure, avoiding the risk of glue detachment in traditional split assembly and increasing the connection strength by 50%.

Hidden sprue design: The sprue is set in non visible areas such as the end of the mirror leg or the bottom of the nose support bracket, and can be assembled without trimming to avoid affecting the appearance.

3. Adapting to Diverse Material Properties, Balancing Performance and Aesthetics

The performance of different eyeglass frame materials (TR90, PC, ABS) varies greatly, and the mold needs to be optimized accordingly

4. Efficient Production Design, Reducing Costs

In response to the demand for mass production of eyeglass frames, the mold design highlights high efficiency:

Multi cavity layout: adopting a symmetrical layout of 1 mold with 4 cavities or 1 mold with 8 cavities

Long life design: The mold cavity is made of S136 stainless steel (strong corrosion resistance) or H13 hot work mold steel (good wear resistance), with a mold life of ≥ 500000 times, reducing the cost of frequent mold changes.

II Production Process of Injection Mould For Eyewear Frames

1. Product Design and Mold Development

(1) Product Design

Structural design: Draw a 3D model of the eyeglass frame using CAD software, with a focus on designing the thickness of the rim, the cross-sectional shape of the temple, the height of the nose support, and adapting to different heights of the nose bridge;

(2) Mold development

Mold material: The mold cavity is made of S136 stainless steel (suitable for materials with high appearance requirements such as PC and transparent ABS) or H13 hot work mold steel (suitable for tough materials such as TR90, with a service life of ≥ 500000 times); The guide column and guide sleeve are made of SUJ2 bearing steel (hardness HRC58-62);

Mold cavity processing: preliminary shaping is achieved through five axis CNC milling, followed by refinement of complex surfaces through electrical discharge machining, and finally mirror polishing is performed using diamond polishing paste;

Cooling system design: The mirror ring area adopts a circular waterway, and the mirror leg area adopts a linear waterway to ensure uniform cooling in each area. The cooling time is controlled within 15-25 seconds.

2. Raw Material Preparation and Injection Molding

(1) Raw material pretreatment

(2) Injection molding

3. Post-Processing and Quality Inspection

P&M Injection Mould For Eyewear Frames(Specification)

P&M Injection Mould For Eyewear Frames Feature And Application

According to the functional positioning and user differences of eyeglass frames, there is significant adaptability in the design of injection molds and material selection. The core scenarios include:

1. Sports Goggle Moulds

Core Requirements: High toughness, impact resistance, strong weather resistance, adapting to outdoor sports (running, skiing, cycling) scenarios, and able to withstand severe collisions and extreme environments.

Mold and Material Features:

The mold cavity uses H13 hot work mold steel (good wear resistance, service life ≥500,000 cycles), the lens rim cavity is designed with a large curvature (adapting to the facial protection range), and the wall thickness is uniformly 1.5-2.0mm (enhancing impact resistance);

Adapted to TR90 material (impact strength ≥60kJ/m², can withstand a drop of 1.5m without breaking), the mold cooling system uses annular water channels (spacing 8mm), and the cooling time is 25 seconds to ensure no internal stress after TR90 molding;

The temple cavity integrates anti-slip texture (protrusion height 0.3mm, spacing 0.5mm) to improve wearing stability and prevent slipping during sports.

2. Sunglasses Moulds

Core requirements: Beautiful appearance (high gloss/matte texture), UV protection, lightweight, suitable for daily travel and fashion matching scenarios.

Characteristics of molds and materials:

The mold cavity is made of S136 stainless steel (mirror polished Ra ≤ 0.008 μ m), compatible with PC transparent material or ABS colored material, ensuring that the surface of the mirror frame is transparent and flawless;

Support dual color injection molding (such as black mirror ring and gold mirror legs), the mold is equipped with a 180 ° rotating mechanism (positioning accuracy ± 0.003mm), and there is no obvious gap at the joint (gap ≤ 0.01mm);

Reserved polarizing lens installation groove (width 2.0mm, depth 0.5mm) in the mirror ring cavity, with smooth groove wall (Ra ≤ 0.4 μ m), ensuring that the lens is firmly installed without looseness.

3. Myopia Eyewear Frame Moulds

Core requirements: Lightweight, high comfort, accurate size, suitable for long-term wear (8-12 hours/day), compatible with lens installation and nose bridge fitting.

Characteristics of molds and materials:

The mold cavity adopts a symmetrical layout of 1 mold and 8 cavities (with an efficiency of 240 pieces/hour), and the inner diameter tolerance of the mirror ring is ± 0.02mm (to ensure compatibility with lenses of different degrees);

Suitable for ABS material (lightweight, single frame weight ≤ 15g), adjustable height of nose support cavity (8-12mm, suitable for people with different nose bridge heights)

Customization Process

Factory&About US

NingBo Plastic Metal Product Co.,Ltd (P&M) is located in Yuyao, the so-called Mould City, Plastic Kingdom, in the southern tip of Hangzhou Bay Bridge,north of Shanghai, the east of Ningbo Port,tight double line of State Road 329 on land, sea and air trafic into a network to facilitate transport.

By the abundant technical strength,scientific management methods and good after-sales service, product deeply trusted and welcomed by customers from all over the world. P&M holds improved system of development and production, to achieve mold design, plastic products manufacturing and automatic production. Our main products is design and manufacturing of plastic mold, plastic product, metal product. 90% products of our enterprise are exported to America, Europe, Germany, Japan, Australia, etc. For many years, the company has been committed to the research of raw materials. The company has its own trademark and dozens of patents, providing more convenient technical support for mold making and product production. P&M started domestic business from 2008,named Shundi Mould Factory. And opened the international market from 2014. We always adhere to the principles of quality first and time first. While providing customers with the highest quality products, try to maximize the production efficiency and shorten production time. We are proud to tell every customer that our company has not lost any customer since its establishment.If there is a problem with the product, we will seek a solution actively and take responsibility to the end.

P&M adheres to market-oriented to the quanlity of life and focus on quality service and continuous development of new products,determined to establish a better corporate image,and our friends at home and abroad to carry a wide range of business exchanges and cooperation, create brilliant.

Packing

Packaging according to your needs

1. By air ,it takes 3-7 days for delivery.

The goods can be shipped by DHL , Fedex , UPS .

2. By sea ,the delivery time is based on your port.

To South East Asian Countries takes about 5-12 days.

To Middle east countries takes about 18-25 days.

To European countries takes about 20-28 days.

To American countries takes about 28-35 days.

To Australia takes about 10-15 days.

To African countries takes about 30-35 days.

P&M Bike parts, centered around children, balances safety, health, and fun, aiming to add a bright color to children's beautiful childhood. We look forward to working together with you to serve our children.

The path of a child's growth is paved with bricks and tiles.

FAQ

1.Who are we?

We are based in Zhejiang, China, start from 2014,sell to North America(30.00%),Southern Europe(10.00%),Northern Europe(10.00%),Central America(10.00%),Western Europe(10.00%),Mid East(10.00%),Eastern Europe(10.00%),South America(10.00%). There are total about 51-100 people in our office.

2.How can we guarantee quality?

Always a pre-production sample before mass production;

Always final Inspection before shipment;

3.What can you buy from us?

Mould, Plastic Product, Metal Product, Dental Product, CNC machining.

4.Why should you buy from us not from other suppliers?

We main do all kinds of 3d design, 3d printing and plastic metal molds tooling and products. We have our own engineer and factory. One-stop supply: 3d design - 3d printing - mold making - plastic injection.

5.What services can we provide?

Accepted Delivery Terms: FOB,CFR,CIF,EXW,FCA,DDP,DDU;

Accepted Payment Currency: USD, EUR;

Accepted Payment Type: T/T,L/C,PayPal,Western Union,Escrow;

Language Spoken:English,Chinese,Spanish,French,Russian.

6.What are the characteristics of your service?

1. Your inquiry related to our products or prices will be replied within 24 hours.

2. Well-trained and experienced staffs to answer all your enquiries in fluent English.

3. Offering the support to solve the problem in the application or selling period.

4. Competitive prices based on same quality.

5. Guarantee samples quality same as mass production quality.