How to make eclipse glasses?
2025-02-03 20:26 China Haijiang
26
Fully Understand the Whole Process of Making Plastic eclipse Glasses: This Is How They Are Born!
In daily life, plastic eclipse
glasses are essential items for many people. Whether it's for those with myopia or fashionistas aiming to create a stylish look, they can't do without them. But have you ever wondered how these seemingly simple plastic glasses are produced step by step in factories? Today, let's take a deep dive into the manufacturing process of plastic glasses, explore the secrets behind it, and also introduce you to the Haijiang injection - molding machine, which plays a crucial role and is especially energy - saving.
glasses are essential items for many people. Whether it's for those with myopia or fashionistas aiming to create a stylish look, they can't do without them. But have you ever wondered how these seemingly simple plastic glasses are produced step by step in factories? Today, let's take a deep dive into the manufacturing process of plastic glasses, explore the secrets behind it, and also introduce you to the Haijiang injection - molding machine, which plays a crucial role and is especially energy - saving.
Preliminary Preparation: Prepare in Advance
The preliminary preparation for making plastic glasses is of great significance. Just like preparing provisions and weapons before going to war, this stage mainly focuses on finalizing the raw materials and relevant equipment to lay a solid foundation for subsequent production.
Raw Materials: The Key to Quality
PC (Polycarbonate)
PC is a commonly used material for making plastic glasses frames. It has numerous advantages. PC material has high strength and is not easy to deform, which can well protect the lenses. Moreover, it is relatively impact - resistant. Even if you accidentally drop the glasses, it can withstand a certain impact and is not easy to be damaged. In addition, PC material has high transparency and will not affect the optical performance of the glasses, allowing you to see more clearly. However, PC material has a small drawback in that it is prone to absorbing moisture. Therefore, it must be dried before use.
TR90 (Memory Plastic)
TR90 is also a high - quality material for making glasses. Its most prominent feature is its memory elasticity. For example, if you accidentally bend the temple, it can automatically return to its original shape, which is very convenient. Moreover, TR90 material is very light. You can hardly feel its weight when wearing it, and you won't feel tired even after long - term wearing. Its flexibility is also very good, and it can adapt to different face shapes.
Equipment: The "Weapons" for Production
Haijiang Injection - Molding Machine (Core Equipment)
In the production process of plastic glasses, the injection - molding machine is definitely the core equipment, and the Haijiang injection - molding machine is the top choice among them. Its precise screw can well adapt to glasses - specific materials such as PC and TR90, ensuring the smooth progress of the injection - molding process. Moreover, the Haijiang injection - molding machine is equipped with micro - foaming technology, which is a powerful function. For high - end glasses, it can reduce the weight of the frame by 30%, making it more lightweight and comfortable to wear. In addition, the Haijiang injection - molding machine supports multi - color injection molding. If you want to make glasses with gradient - colored temples, it can easily achieve this, but a dual - material injection - molding machine is required. When it comes to energy - saving, the Haijiang injection - molding machine adopts advanced energy - saving technologies. Compared with traditional injection - molding machines, it can significantly reduce energy consumption while ensuring efficient production. A medium - sized glasses production factory can save tens of thousands of kilowatt - hours of electricity in a year by using the Haijiang injection - molding machine, which really saves a lot of costs for the enterprise.
Glasses - Specific Molds
Molds are crucial for the production of plastic glasses as they determine the shape, size, and details of the glasses. The accuracy requirements for frame molds are extremely high, reaching the 0.01mm - level accuracy, and they are equipped with air - venting grooves to prevent air bubbles during injection molding. The temple hinge molds adopt a micro - ejector - pin design, which can form a 0.5mm - diameter hinge shaft, making the opening and closing of the temples smoother. In addition, there is a quick - mold - change system that can switch different styles of molds in only 15 minutes, greatly improving production efficiency. Here's an industry secret: high - end molds use mirror polishing, which eliminates the need for post - processing grinding. This not only improves production efficiency but also makes the surface of the glasses smoother.
Lens Buckle Assembly Machine
This equipment is mainly used to automatically embed metal or nylon buckles, which are used to fix the lenses. It also has a very important function, which is pressure control. It can accurately press - fit within the range of 20 - 50N, which can prevent the frame from deforming during the assembly process and ensure the quality of the glasses.
Production Process: All Links Cooperate Closely to Create High - Quality Glasses
Raw Material Preparation
Drying Treatment
As mentioned before, PC material is prone to absorbing water. So, first, put the PC pellets into a dehumidifying dryer and dry them at a temperature of 120°C for 4 hours, ensuring that the moisture content is ≤0.02%. Only in this way can we avoid problems such as air bubbles and deformation during the injection - molding process.
Color Mixing (Optional)
If you want to make colored glasses or want to adjust the translucent effect of TR90 material, you need to use a color mixer. Put PC pellets or TR90 material and color masterbatch into the color mixer according to a certain proportion. Through actions such as stirring and tumbling, make them fully and evenly mixed. The mixing proportion and time are crucial. Different proportions will produce different color effects. Generally, the mixing time is about 15 - 30 minutes, and the specific time needs to be adjusted according to the actual color requirements and the performance of the color mixer.
Injection Molding
Mold Installation
Install the carefully designed and manufactured glasses mold onto the Haijiang injection - molding machine. This process requires great care to ensure that the mold is firmly installed and in the correct position. The installation accuracy of the mold directly affects the injection - molding effect. If the mold is not firmly installed or the position is deviated, it may cause problems such as flash, inaccurate dimensions, and irregular shapes of the frame. After installation, the mold also needs to be debugged to check whether the mold opens and closes smoothly and whether all components are working properly.
Parameter Setting
Adjust the various parameters of the injection - molding machine according to the characteristics of the plastic material, the structure of the glasses mold, and product requirements. These parameters include injection pressure, injection speed, holding pressure, holding time, and cooling time.
Injection Pressure: Generally, it is between 80 - 150MPa. The injection pressure should be moderate. If the pressure is too low, the plastic material cannot quickly fill the mold cavity, which may lead to problems such as material shortage and incomplete filling of the frame. If the pressure is too high, it may cause the mold to be impacted too much, affecting the service life of the mold, and may also lead to problems such as flash and deformation of the frame.
Injection Speed: An appropriate injection speed can ensure that the plastic material evenly fills the mold cavity. If the injection speed is too fast, the plastic material may generate turbulence, resulting in defects such as air bubbles and cavities inside the frame. If the injection speed is too slow, it will affect production efficiency and increase production costs.
Holding Pressure: Usually, it is 60% - 80% of the injection pressure. The function of the holding pressure is to continuously supplement the plastic during the cooling and shrinkage process of the plastic material to prevent the frame from having defects such as shrink marks and depressions. The setting of the holding pressure and time needs to be adjusted according to factors such as the thickness and shape of the frame.
Cooling Time: The cooling time depends on the thickness of the frame and the cooling efficiency of the mold, generally between 10 - 20 seconds. If the cooling time is too short, the frame may be ejected from the mold before it is fully set, and it is easy to deform. If the cooling time is too long, it will reduce production efficiency. At this time, the chiller comes in handy. It can quickly cool the frame mold and control the temperature difference within ±1°C to ensure the cooling effect.
Injection - Molding Process
After everything is ready, start the Haijiang injection - molding machine. The dried and color - mixed (if any) plastic material is heated and melted in the barrel of the injection - molding machine. Then, under high - pressure, it is injected into the mold cavity. In the mold cavity, the plastic material gradually cools and solidifies to form the shape of the frame. This process is like casting a spell in the "magic box" of the mold, turning the plastic material into the frame shape we want.
Temple Manufacturing
Injection Molding
Use TR90 material to injection - mold the temples through an injection - molding machine. This process is similar to the injection - molding process of the frame and also requires attention to mold installation, parameter setting, and other issues.
Hinge - Shaft Press - In
After the temples are injection - molded, the hinge shafts need to be pressed into the temples. This step requires ensuring that the position of the hinge shafts is accurate and the pressing - in force is moderate. Otherwise, it will affect the opening and closing of the temples.
Electroplating and Coloring (Optional)
If electroplating and coloring of the temples are required, the temples can be put into a vacuum electroplating machine to plate them with metal colors such as gold, silver, and gun - gray, making the temples look more beautiful.
Assembly and Debugging
Frame and Temple Combination
Combine the injection - molded frame and temples. During this process, pay attention to the firmness of the connection to ensure that the frame and temples can be closely combined without looseness.
Nose - Pad Installation
Select suitable nose - pads and install them on the frame. The position of the nose - pads should be appropriate to ensure that the glasses can be comfortably placed on the bridge of the nose. If it is an adjustable nose - pad system, a micro - injection - molding machine is also needed to produce silicone nose - pad cushions, and then install the sliding - adjustment tracks through a robotic - arm assembly station.
Hinge Opening and Closing Test
Conduct a hinge opening and closing test on the assembled glasses. Generally, 50,000 opening and closing tests are required, which is a national standard requirement. Through the test, check the quality of the hinge and the smoothness of the opening and closing to ensure that the glasses will not have problems during use.
Surface Treatment
Polishing and Grinding
Use a vibrating polishing machine with ceramic abrasives to batch - polish the edges of the frame, making the surface of the frame smoother. Then, use a laser engraving machine to engrave the brand logo or patterns on the frame, with a depth of generally 0.1mm. This can not only increase the aesthetics of the glasses but also play a role in brand promotion.
UV - Curing Spraying
Spray a protective paint on the frame using UV - curing spraying technology. It only takes 3 seconds to dry quickly, improving production efficiency. The protective paint can protect the surface of the frame from scratches and also make the frame look brighter.
Anti - Slip Pattern Treatment (Optional)
If it is necessary to press anti - slip patterns on the inner side of the temples, a hot - stamping machine can be used. Just like pressing patterns on a mobile - phone case, it can make the temples more stable when worn and not easy to slip off.
Quality Inspection
Stress Tester
Use a stress tester to detect the bending strength of the frame. Simulate the twisting action when wearing glasses to see whether the frame will deform or be damaged under stress.
Spectroscopic Analyzer
Use a spectroscopic analyzer to verify the effect of the UV400 blue - light - blocking coating to ensure that the glasses can effectively block blue light and protect the eyes.
Appearance Inspection
Carefully check the appearance of the glasses to see if there are any cracks, deformations, rough surfaces, uneven colors, and other problems. Only glasses that pass strict quality inspections can enter the next link.
Packaging and Delivery
Ultrasonic Cleaning
Put the qualified glasses into an ultrasonic cleaning machine to clean off the dust and impurities on the surface, making the glasses look cleaner and neater.
Dust - Proof Bag Packaging
Finally, put the cleaned glasses into a dust - proof bag for packaging. This can not only protect the glasses from damage during transportation and storage but also make consumers feel more refined when they receive the glasses.
The process of making plastic glasses is complex, but every link is closely connected, jointly creating the practical and beautiful glasses in our daily lives. The Haijiang injection - molding machine, with its efficient and energy - saving characteristics, provides strong support for the production of plastic glasses. If you are interested in the production of plastic products, you might as well delve deeper into this field full of technology and innovation. Maybe you will discover more interesting knowledge and business opportunities.
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