Author: aokereyewear

Pure Titanium metal eyewear light weight, generally, pure Titanium metal eyewear 48% lighter than ordinary metal eyewear.

Pure Titanium is a kind of very special metal material which is widely used on space exploration, ship building and human’s medicine instrument, pure Titanium metal eyewear has good anti-corrosion feature.

Pure Titanium metal eyewear high toughness, high stability which anti acid and alkali liquid.

Pure Titanium metal eyewear friendly to human’s body. Its surface can do colorful anodized finish.

With people’s living standards and technology improving, pure Titanium metal eyewear is becoming more and popular because of its excellent performance. pure Titanium is one kind favorite material which is widely used in various optical frame and sunglasses styles.

Nickel release test principles

Put tested metal eyewear sample into in artificial sweat for 7 days, using the atomic absorption or inductively coupled plasma spectroscopy dissolved concentrations of nickel. Nickel emissions are represented by μg/ｃ㎡/week.

Test reagents
All reagents for analytical purity or higher level and contains without nickel. Demonized water, sodium chloride, DL-lactic acid, urea, ammonia, nitric acid, degreasing solution.

Pretreatment equipment
PH meter, thermostatic water bath.
Metal eyewear sample pretreatment

Preparation of test solution
Artificial sweat test solution consists of demonized water and contain: 0.5% sodium chloride, lactic acid, 0.1% urea, ammonia 1%.Before use, ensure that the pH of the solution within the 6.40~6.60.The test solution should be used within 3 hours of preparation.

Release procedures
The metal eyewear sample is put in brackets and suspended in test container. Adding a certain amount of approximately 1mL/c test solution to test square meters area.
Suspension metal eyewear sample shall be completely immersed in the test solution. Note the sample size and the volume of the test solution. Test liquid tightly closed containers to prevent evaporation. Smoothly and keep the container in a constant temperature water bath (30 ± 2) ℃, 168H, don’t stir.

After 7 days, take out of metal eyewear samples from test liquid,clean with a small amount of demonized water, will join the test with a clean solution. transfer to a volumetric flask of appropriate volume of test solution. In order to prevent the dissolution of nickel deposits added to the test solution dilute nitric acid and deionized water, its sizing to the nitric acid contains about 1% after the score.

At least do 2 set of the same metal eyewear samples.

Blank test
Repeat the blank test should be carried out in parallel with the test samples. Use the same container and bracket, the same program, Captain no sample in the container. Using the same amount of test liquid, washing liquid and dilute nitric acid.

Sample test
Instrument
Atomic absorption spectrometers.
Method
Place the flask in an atomic absorption spectrometer, atomic absorption spectrometers the wavelength adjustable to 232.0nm, spectral bandwidth: 0.2nm, record the nickel concentration in the solution.
Count
Metal eyewear sample nickel release rate d, represent as (μg/ｃ㎡/week), according to the following formula:
d = V(C1-C2)/1000A
V – the volume of the test solution, mL
C1 – 7 days after the nickel content of the test solution, μ g/l
C2 – 7 days after the nickel content of the blank test solution, μ g/l
A – sample surface area c㎡.
Calculation result to two decimal places.

Calculate d multiplied by 0.1-adjusted rate of nickel release test results. If test result more than 0.5μg/ｃ㎡/week, can verify that the nickel release rate exceed of standard.

In the daily life, why some metal eyewear cause wearer skin allergy?

It is mostly associated with excessive release of heavy metals elements in low quality metal eyewear. Especially nickel release harmful to the environment and human health. However, low quality metal eyewear adopts low cost of nickel plating.

For daily life, low quality metal eyewear in contact with the skin for a long time, wearers sweat cause nickel elements high erosion activity, the nickel cause skin allergy.

Release amount of nickel had become a topic of concern in the field of metal eyewear product quality. The International Organization for Standardization (ISO) and European Organization for Standardization (CEN) have strict management measures on the release amount of nickel.

This article studies the nickel release test methods, reference for related metal eyewear wearers and eyewear companies to reduce low quality metal eyewear harm to people.

Nickel is a heavy metal elements likely cause of allergy in human’s skin. Medical observation proves that long-term exposure to nickel-containing objects can cause skin allergies and even cancer. Excessive amount release of nickel in metal eyewear can result in harm to human health. International Organizations and the European standardization organization (CEN) have strict management measures on this.

EU countries have strict rules and standards for metal eyewear. Metal eyewear won’t allow to sale to consumers with excessive nickel release amount. In June 1994, EU issued a 94/27/EC directive, providing standard for release amount of nickel. In July 1997, the EU released 3 harmonized standards, defines the method of a qualitative analysis of nickel amount of release. ISO/TS24348 method for detection of nickel release in 2007 of the officially promulgated, which expressly provides that: Metal eyewear with the wearer’s skin and prolonged exposure to nickel and alloy components of release amount shall less than 0.5μg/ｃ㎡/week.

To be issued by the ISO12312-1 of the sunglasses are a direct reference to the provisions and requirements: Sunglasses designer and manufacturer shall not endanger the health or safety of the wearer, and should minimize the risk of possible damage the wearer’s skin by the lens or frame material.

Korea technical standards (KATS) published belongs to the proposed modifications to the safety and quality mark for industrial products, this proposal seeks to amend the safety and quality standard in sunglasses and optical fame, the release of nickel for sunglasses and optical frame to adjust to less than 0.5μg/ｃ㎡/week.

From the current status, Chinese eyewear products accounted for more than 70% of the world’s total eyewear production amount, and exports more than 60% to the international eyewear market. However many domestic manufacture of metal eyewear adopts low cost of nickel plating.
Since International Organizations (ISO) and the European standardization organization (CEN) have new stringent requirements of release amount of nickel, which brought a great impact on domestic eyewear industry, it becomes necessary for well understanding production method for the detection of nickel release.

As a professional metal eyewear manufacturer, we adhere to the ISO and European Organization for Standardization (CEN), we cooperate with quality electroplating factory and signed contracts and agreements related to the nickel release test. Each batch of metal eyewear should pass through the nickel release test.

Just share one beautiful buffalo horn eyewear model.

Hot style, looks like Moscot shape, purely natural buffalo horn.

This model is quite classic buffalo horn eyewear. Someone like it?

Titanium eyewear is in fashion now, because titanium eyewear has many excellent properties

1, light weight, about 40% lighter than stainless steel eyewear and nickel silver eyewear.

2, High hardness, about twice hardness to other metal eyewear such as stainless steel eyewear and four times hardness to ordinary nickel silver eyewear, In the cryogenic world, titanium eyewear has become more hard, and have the properties of superconductors, the stainless steel eyewear becomes weak and incompetent.

3, Corrosion-resistant, won’t rust. Titanium eyewear won’t rust soak in the sea water for 5 years, stainless steel eyewear must corrosion in sea water.

4, Touches and feeling good, Titanium eyewear warm and silky to the touching, other metal eyewear has cold metallic feeling.

5, No skin allergy, titanium eyewear does not produce allergic reactions to humans skins, also titanium is used in human body, such as artificial teeth, artificial bones.

Titanium eyewear because of its light weight, corrosion resistance, and non-allergic quality features has becomes a new trend. But compared to other metal eyewear, acetate eyewear, titanium eyewear price is much higher.

Why the Titanium eyewear is expensive?

One reason is the current titanium raw material costs are too high

The other reason is the production of titanium metal frames is very complex

The production of titanium eyewear requires special processing equipment, special welding technology and electroplating technology, many high difficult and different processes with normal metal eyewear, so it with high production costs.

With the emergence of new titanium eyewear production equipment, as well as the improvement of industry production and processing technology, titanium eyewear will become lower prices to a wider people.

Metal eyewear is completed by using the welding machine, with about 40% to 69% the purity of silver brazing wire welding. Welding group main process: welding rim lock→ open rim lock→ welding metal bridge →welding cross bridge→ welding nose arm→ welding hinge→ welding spring hinge box→ welding frame, What can we do if any part of metal eyewear was broken?

During the metal eyewear producing process, the metal eyewear was welded in the mould. The mould main function is to ensure accurate position of welding on metal frame. The welding machine through instant high temperature to melt metal and put pressure on the two metal parts together and so it does not harm the original shape.

Generally, weld broken metal eyewear almost belonged to damaged, It is not to say cannot rework the welding, but it will completely destroyed plating layer when welding, it is hard to weld in a daily environment, even if reluctantly welding, the plating was damaged and the metal frame will lost the original shape.

In fact, metal eyewear plating color fall off is the problem of plating issue, it has nothing to do with metal eyewear. Usually the metal eyewear is required to be plated finished. Here we introduce several plating process for metal eyewear and their advantages and disadvantages.

Electrophoresis plating, commonly known as “water-plating”, it refers of coating mirror surface on metal eyewear by electrolytic method, more commonly used in normal alloy metal eyewear. To take example, stainless metal eyewear, nickel silver metal eyewear etc..

Advantages: low cost, and rich colors
Disadvantages: Very low coating adhesion, gold, silver, gun generally available for about a year; other colors generally can occur color fall off in 3-6 months.
Most Chinese eyewear supplier applies water-plating method coating metal eyewear.

Heavy gold electroplate–divided into “multi-layer texture coating method” and “the multilayer plating method” of two kinds. These two kinds of galvanization technological requirement is a natural metal color, thus the frame color is a single adopting of such processing, basically gold, silver major color.

The feature is coated with a thick 3.5UM gold or silver, generally available for about many years, no skin irritation and discomfort complaints.

IP vacuum ion plating: heat frame surface to form negative ions, free in a vacuum furnace, combined with the pigment particles through current electrodes to the lead adsorption on the surface of frame plating layer is formed.
Advantage: Eco-friendly, strong electroplated coatings adhesion, generally available for about many years without color falling off.

Weaknesses: color is gloomy, plating is not bright.

Multi-coated divided into spraying and paint two types.
A, spraying process: used for many students metal eyewear outer coating and covering.
Advantages: rich colors, bright
Disadvantage: prone to falling off and fading.

B, baking varnish technology: Used for fashion frames;
Advantages: coating thick, colorful and bright
Disadvantages: easy to scratch, color fall off.

There are various metal eyewear plating method, quality plating refers to electroplating equipment, materials, technology and other related factors, compared to other plating method, vacuum ion plating process is more complex, technical requirements for equipment are higher, so it is not easy to color falling off, the plating cost more expensive.

Usually, metal eyewear material ranges are nickel silver, stainless steel, titanium etc… These materials processed through precision processing, e-plated with gold, silver, or popular painting colors finish. Metal eyewear is sturdy and durable; it has smooth surface and good appearance, light weight. Following is a brief introduction about our metal eyewear producing process:

1. After we receive customer’s order, we will study carefully as per customer’s specific requirements; we will work and confirm with customers every detail in order to ensure that the products meet customer’s specific requirements. During the producing processes, the production order will be arranged to different departments such as design department, material procurement department, accessories department, assemble department, e-plating and painting department, assembling and shipping department.

2. Samples production. We can make the technical drawings as per customer’s specific requirement and physical samples. After the drawing approved well, samples production will be started, we will ship the samples for our customer approval. Final confirmation of the sample is the basis of our products basis.

3. Material preparing. Our materials procurement department will book material according to customers orders needs, the material includes eye wire, bridge metal and end piece and other accessories, temples tips material etc. Metals generally have nickel silver, stainless steel, titanium etc, in order to ensure the quality; most of metal materials we used are high quality which imported from foreign.

4. Accessories producing, After material reach to us, we will process oil pressed or wire cutting the material or semi-finished products, then the accessories will go through bending, cutting, welding, polishing, tumbling, shinny, etc.

5. Welding group main process: welding rim lock→ open rim lock→ welding metal bridge →welding cross bridge→ welding nose arm→ welding hinge→ welding spring hinge box→ welding frame

6. Acetate parts group process (including temples tips, plastic temples): acetate cutting→ shooting metal core→ cut temple→ temple decorating →handiwork→ bend temples→ tumbling → polishing →QC, final process is for frame assembling.

7. Lens cutting. Firstly making eye mold based on CAD drawing, and then fix eye mold on cutting machine to cut lenses.
Assemble process. According to the orders assembling group assemble for the front, temples/temples tips, lenses. So that a complete metal eyewear are finished.

8. Final inspection. After the assembly is completed, if metal eyewear has attached acetate temple tips, it will process final polishing and shinny, and then clean the frame and process final inspect. All products must get through final inspection before shipment.

Finally, according to the requirements of the customers, we ship the goods through express (usually we use FedEx, DHL, or UPS) or by air to transport the goods to the customer’s hands, we’ll do the tracking and trance for the goods, once we find the shipping problem, we will act promptly to handle the problem. After customer receive the products, customer feedback with any questions, our related person will seriously study and then make a proper processing until customer satisfied.

Our factory most competitive products are metal eyewear, acetate eyewear and buffalo horn eyewear.

For buffalo horn eyewear wearers, the most difficult problem is probably the buffalo horn eyewear out of shape.

It is a troublesome problem for the wearers, it will not only affect the users comfortable wearing, but also cause wearers feel fatigue, and headaches. If users wear such frame, in some cases, even endanger to the health of the wearers eyes.

Why buffalo horn eyewear out of shape?
Formerly, buffalo horn is a purely natural products and horn original texture and shape is curved, so horn raw materials have features of memory functions.

From our industry experience, other buffalo horn eyewear suppliers products is easily out of shape, some suppliers products won’t out of shape. How come it is?

Since a piece of horn material width is 170mmx60mm, during produce buffalo horn arms. In order to save horn material. Other buffalo horn eyewear suppliers engrave straight arms. In this method, they are able to cut out 2 pairs of arms, thus saving some production cost and make more profits.

However, this method was likely to cause products out of shape. Because these straight buffalo horn arms need bending procedure, for a few time, horn original texture and shape must bounce back into the original straight, eventually leading to the wearer’s buffalo horn eyewear out of shape.

In order to prevent buffalo horn eyewear out of shape because of memory functions, during engrave buffalo horn arms, our factory totally follows horn original texture and shapes. In this method, buffalo horn arm is a naturally curvature. No need bend-shape by hand in later procedures. These natural bending arms are not easy out of shape compared with straight arms. It is also not easily out of shape in wearer’s hand.

Actually, following horn original texture and shapes spends more horn material. If arms width relative big. Base on measurement 170mmx60mm horn raw material. It can only produce 1 pair of arms. For straight arms, it can produce 2 pair of arms. Our costs are increased by one half.

As a professional buffalo horn eyewear supplier, in order to peruse a high end quality buffalo horn eyewear product. We guarantee that all our buffalo horn arms produced by follow horn original texture and shapes.