Goggle injection moulding

In addition, our company has established cooperative relationships with plastic raw material suppliers, printing manufacturers, etc. to ensure the supply of raw materials and printing quality. Through our rich experience and perfect supply chain, our company can provide customers with high-quality customized goggle injection moulding products to meet their specific needs. At the same time, we have 10 years of professional foreign trade service experience, understand the foreign trade process, and better serve our customers. For goggle injection moulding products, we can make corresponding plastic parts, which is mainly done through injection molds.

Goggles are typically made from highly transparent, impact-resistant plastics (such as polycarbonate (PC)). The production process demands high precision and cleanliness to ensure the final product possesses excellent optical properties and protective properties.

The entire process can be divided into three main stages: pre-molding preparation, the injection molding cycle, and post-processing and inspection.

Stage 1: Pre-molding Preparation

This is the foundation for ensuring product quality. If the raw materials are not handled properly, even the most impeccable subsequent processing will not result in a qualified product.

Raw Material Selection and Pre-treatment:

Material: Polycarbonate (PC) is the most commonly used due to its extremely high impact strength, high light transmittance, heat resistance, and good dimensional stability.

Drying: PC resin is hygroscopic and absorbs moisture from the air during storage and transportation. Moisture-containing particles undergo hydrolysis during high-temperature injection molding, leading to molecular chain breakage and defects such as silver streaks, bubbles, and reduced strength. Therefore, prior to injection molding, the pellets must be thoroughly dried in a hopper dryer at a specific temperature (e.g., 120°C) (usually for at least 2-4 hours).

Mold Preparation:

Mold Design: Goggle molds typically consist of a lens mold and a frame mold (or a single unit if the goggle is a one-piece design). The cavity surface requires high-precision polishing, even to a mirror finish, to ensure a smooth and transparent product.

Installation and Commissioning: The mold is installed on the injection molding machine and commissioned to ensure the proper functioning of the ejection system, cooling water circuits, runners, and other components.

Surface Cleaning: Before closing the mold, the mold cavity surface must be thoroughly cleaned with a dust-free cloth or a dedicated cleaning agent. Any oil or dust will cause product defects.

Phase Two: Injection Molding Cycle (Core Process)

This is a repetitive, automated cycle, each consisting of the following steps:

1. Mold Closing and Locking

The movable and fixed mold sections of the injection molding machine are tightly closed under high pressure, forming a sealed cavity to withstand the immense melt pressure during injection.

2. Injection and Holding Pressure

Injection: The screw advances through the barrel, injecting the already plasticized, high-temperature, viscous plastic melt into the mold cavity at high speed and high pressure.

Holding Pressure: After the cavity is filled, the screw continues to maintain a certain pressure (holding pressure) to replenish the volume lost due to cooling and shrinkage of the melt. This prevents sink marks and dents in the product, which is crucial for ensuring product dimensional accuracy and surface quality.

3. Cooling and Plasticization

Cooling: The melt is cooled and shaped within the mold through a cooling water circulation system. The cooling time directly affects production efficiency and internal stress in the product. Too short a time will result in product deformation; too long a time will result in low efficiency.

Plasticization: During the cooling process, the screw, driven by a motor, rotates, conveying, compressing, shearing, and heating the plastic pellets from the hopper, evenly melting and plasticizing them and preparing them for the next injection.

4. Mold Opening and Ejection

After cooling is complete, the mold opens, and the injection molding machine's ejector mechanism (ejector pins, ejector plate) ejects the cooled and solidified goggles from the mold cavity.

A robotic arm or robot typically automatically reaches in, picks up the product, and places it on a conveyor or designated container, enabling automated production.

Stage 3: Post-Processing and Inspection

The goggles, fresh from the mold, are only semi-finished products and require a series of processing steps to become qualified products.

Sprue Removal: Cut or punch out the waste material (called sprue material) connecting the main and branch runners to the product.

Post-Processing (Annealing): For PC goggles, internal stress is generated during the injection molding process. To eliminate this stress and improve the product's dimensional stability and resistance to environmental stress cracking, the product is typically annealed in an oven (e.g., at 110-120°C for 1-2 hours, followed by slow cooling).

Surface Treatment (Optional):

Hard Coating: The PC surface is relatively easy to scratch. High-end goggles often feature a hardened, wear-resistant coating to increase their scratch resistance.

Anti-fog coating: To prevent fogging and obstructing vision, the inner surface of the lens is sprayed or soaked in an anti-fog solution, creating a hydrophilic anti-fog film.

UV protection: UV absorbers are added to the raw materials or coated on the surface to block UV rays.

Assembly: The lenses, frames (if produced separately), headband, sealing sponge, and other components are assembled together.

Full inspection and packaging:

Full inspection: This is a crucial step. Inspection includes:

Appearance inspection: Checks for defects such as shrinkage, silver streaks, bubbles, black spots, scratches, and stains.

Dimensional inspection: Calipers, projectors, and other tools are used to verify that key dimensions are within tolerance.

Performance testing: Impact tests (such as a steel ball drop test), light transmittance tests, haze tests, and weather resistance tests are performed.

Packaging: After passing inspection, individually wrap the parts in soft materials such as PE bags or bubble wrap to prevent scratching, then pack them into cartons.

Key Process Parameters and Quality Control Points

Temperature: Barrel temperature, nozzle temperature, and mold temperature (significantly impacts product internal stress and surface finish).

Pressure: Injection pressure and holding pressure.

Speed: Injection speed.

Time: Injection time, holding time, and cooling time.

Environment: The injection molding workshop should ideally maintain dust-free standards, especially when producing goggles with high optical requirements, where dust is a natural enemy.

In short, injection molding of goggles is a complex manufacturing process that integrates materials science, mechanical automation, mold technology, and precision craftsmanship. Precise control of every step is crucial to ensuring the quality of the final product.

We are a goggle injection moulding manufacturer, providing high-quality goggle injection moulding manufacturing. As long as you want to customize/develop goggle injection moulding products, you can find us. We have professional injection mold design and mature manufacturing technology, providing you with one-stop service, from product design-mold making-product production-product packaging-product transportation, we can help you in every link. As long as you come to us, we will provide you with the ultimate service and satisfy you in terms of product quality, production time, information dialogue, etc.

Plastic Injection Mould making

Plastic molding specifications

Mold design:

Transaction process:

Mold testing:

Product packaging

Factory

We are Custom Plastic Mold factory. Our factory is plastic injection mold maker. we has 17 years of experience in professional custom plastic mold and 10 years of foreign trade experience. We are custom Plastic Mold supplier. We can provide custom Plastic Mold service. Our factory can make the Injection molded plastic parts, and the quality of the products will satisfy you.

We have more than 50 high-end machines and hundreds of engineers and designers. We can provide one-stop service, from product design - mold making - product production - product packaging - transportation. We have a complete production chain. We can meet all your requirements.

Services we provide:

Professional custom mold service, Plastic mold design and manufacturing .plastic product production, product design, mold design, blow mold customization, rotational mold customization, die-casting mold customization. 3D printing services, CNC manufacturing services, product packaging, customized packaging, shipping services.

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.

FAQ

Q1: Are you trading company or manufacturer ?

A: We are manufacturers.

Q2. When can I get the quotation?

A: We usually quote within 2 days after we get your inquiry.

If you are very urgent, please call us or tell us in your email so that we can quote for you first.

Q3. How long is the lead-time for mold?

A: It all depends on the products' size and complexity. Normally, the lead time is 25 days.

Q4. I have no 3D drawing, how should I start the new project?

A: You can supply us a molding sample, we will help you finish the 3D drawing design.

Q5. Before shipment, how to make sure the products quality?

A: If you don't come to our factory and also don't have the third party for inspection, we will be as your inspection worker.

We will supply you a video for production process detail include process report, products size structure and surface detail, packing detail and so on.

Q6. What is your payment terms?

A: Mold Payment: 40% deposit by T/T in advance, 30% second mold payment before sending out the first trial samples, 30% mold balance after you agree the final samples.

B:Production Payment: 50% deposit in advance, 50% before sending out the final goods.

Q7: How do you make our business long-term and good relationship?

A:1. We keep good quality and competitive price to ensure our customers benefit for best quality products.

2. We respect every customer as our friend and we sincerely do business and make friends with them, no matter where they come from.