Custom PA6+GF30 plastic part 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 custom PA6+GF30 plastic part moulding 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 custom PA6+GF30 plastic part moulding moulding products, we can make corresponding custom PA6+GF30 plastic parts, which is mainly done through injection molds.

PA6+GF30 is a modified Nylon 6 material reinforced with 30% glass fiber. It possesses a combination of characteristics including high strength, high rigidity, dimensional stability, fatigue resistance, and resistance to oil and heat. Consequently, it is widely utilized in load-bearing structural components such as automotive structural parts, motor housings, gears, connectors, and brackets. However, due to the addition of glass fiber, the material exhibits reduced flowability, significant anisotropic shrinkage, susceptibility to moisture absorption, increased potential for mold abrasion, and a tendency for "floating fibers" to appear on the surface. As a result, the molding process requires stricter control compared to standard PA6. The following sections provide a detailed explanation of key molding considerations, covering aspects such as raw material pretreatment, mold design, injection molding parameters, and defect control.

I. Raw Material Pretreatment: Thorough Drying and Strict Moisture Control Are Essential

PA6 itself is highly hygroscopic; the addition of glass fiber increases its specific surface area, making it even more prone to adsorbing moisture. If the moisture content exceeds acceptable limits prior to molding, hydrolysis will occur under high-temperature processing conditions. This leads to a reduction in molecular weight, resulting in brittle products and a significant loss of mechanical strength, while simultaneously causing defects such as bubbles, silver streaks, and flow marks.

Drying Temperature: 90°C to 110°C (100°C is commonly used).

Drying Time: 4 to 6 hours (must not be less than 4 hours).

Hopper Drying: During production, a hot-air hopper dryer must be utilized to maintain continuous drying and thermal insulation, thereby preventing secondary moisture absorption.

Moisture Standard: Control moisture content to below 0.05%; the lower, the better.

It is strictly forbidden to process the material directly without prior drying; doing so will result in products that fail to meet standards regarding both appearance and mechanical properties.

II. Key Considerations for Mold Design: Accommodating Glass Fiber Flowability and Shrinkage Characteristics

The flowability of PA6+GF30 is lower than that of pure PA6, and its shrinkage behavior is anisotropic. Because glass fibers tend to align themselves along the direction of melt flow, there is a significant disparity between transverse and longitudinal shrinkage rates, which frequently leads to warping and deformation.

Gate Design: Priority should be given to side gates, pin-point gates, or fan gates. Avoid gate designs that direct the melt to impact the cavity wall perpendicularly, as this can cause glass fibers to concentrate and result in "floating fiber" defects on the surface. Additionally, the gate dimensions should be slightly enlarged to facilitate a faster filling rate.

Runner System: The runners should be designed to be thicker and shorter to minimize pressure loss. This helps prevent issues such as incomplete filling (short shots) and reduced weld-line strength caused by excessive flow resistance. Venting: Venting must be enhanced—particularly in deep ribs, corners, and flow convergence areas—by incorporating vent grooves or vent pins to prevent trapped air, scorching, and glass fiber accumulation.

Cooling Channels: Cooling channels should be distributed uniformly to ensure stable mold temperatures and minimize warping and deformation caused by uneven cooling.

Mold Material and Surface Treatment: Since PA6+GF30 causes significant wear on molds, the cavity material should ideally be quenched steel or pre-hardened steel; surface treatments such as chrome plating or nitriding are recommended to extend mold life.

III. Injection Molding Machine Selection and Equipment Requirements

Glass fibers cause significant wear on the barrel and screw; therefore, specialized equipment is required:

Screw: Use a screw specifically designed for glass-filled materials, featuring a length-to-diameter ratio (L/D) of ≥20 and a moderate compression ratio to avoid excessive shear stress.

Barrel and Nozzle: The inner walls should undergo wear-resistant treatment, and the nozzle orifice diameter should be slightly enlarged to prevent clogging.

Clamping Force: Due to the material's high rigidity and the resulting high injection pressures, the clamping force must be increased appropriately to prevent flash (burrs).

IV. Key Control Points for Core Injection Molding Process Parameters

1. Barrel Temperature

Excessively high temperatures can lead to nylon degradation and glass fiber discoloration; conversely, temperatures that are too low result in uneven plasticization and poor flowability.

Rear Zone: 220°C – 240°C

Middle Zone: 240°C – 260°C

Front Zone: 250°C – 270°C

Nozzle: 250°C – 265°C

The overall temperature should not exceed 280°C to prevent material degradation and embrittlement.

2. Injection Pressure and Speed

PA6+GF30 exhibits high viscosity and poor flowability, necessitating higher injection pressures:

Injection Pressure: 80 – 140 MPa (adjust based on the complexity of the part structure).

Injection Speed: Use a medium-to-high injection speed for filling; thin-walled parts may utilize high speeds, while thick-walled parts should employ multi-stage speed control to prevent the "jetting" of glass fibers, which causes surface fiber exposure (floating fibers).

Multi-stage Injection: Structural parts with non-uniform wall thicknesses must utilize multi-stage injection profiles to prevent short shots (incomplete filling) and scorching. 3. Holding Pressure and Holding Time

The purpose of holding pressure is to compensate for cooling shrinkage and to minimize sink marks, voids, and dimensional deviations:

Holding Pressure: Typically 60% to 80% of the injection pressure;

Holding Time: Adjusted according to wall thickness; it should be sufficiently extended to ensure dimensional stability;

Excessive holding pressure can easily induce internal stress, leading to cracking and warping.

4. Mold Temperature

Mold temperature directly influences crystallinity, dimensional stability, and surface quality:

Mold Temperature: A range of 60°C to 90°C is recommended;

High mold temperatures result in thorough crystallization, low internal stress, and dimensional stability, but lead to longer molding cycles; low mold temperatures result in faster cycles but are prone to high internal stress and warping.

5. Cooling Time

PA6+GF30 exhibits good thermal conductivity, allowing for relatively rapid cooling; however, it is essential to ensure sufficient solidification before ejection:

Cooling Time: Based on wall thickness, typically 10 to 30 seconds;

Premature ejection risks deformation and "whitening" (stress marks), while delayed ejection compromises production efficiency.

6. Screw Speed and Back Pressure

Screw Speed: Medium to low speed is recommended to avoid high shear forces that can cause excessive glass fiber breakage and thermal degradation of the material;

Back Pressure: Moderate to low settings are preferred to prevent excessive or uneven dispersion of glass fibers, as well as overheating.

V. Common Defects and Troubleshooting Tips

Floating Fibers (Exposed Glass Fibers): Appearance of silvery streaks or fiber spots on the surface, primarily caused by excessive injection speed, insufficient mold temperature, or improper gate impingement. Remedies include increasing mold temperature, reducing the injection speed during the initial filling phase, and optimizing the gate location.

Warping and Deformation: Caused by anisotropic shrinkage, uneven cooling, or improper holding pressure. Solutions involve ensuring balanced cooling, optimizing holding pressure parameters, adjusting the gate orientation, and—if necessary—extending the setting time.

Cracking and Brittle Fracture: Caused by insufficient drying of raw materials, thermal degradation due to excessive temperatures, or excessive internal stress. Remedies include ensuring thorough drying of the material, lowering the melt temperature, and extending both the holding time and cooling time.

Low Weld Line Strength: Caused by poor venting, insufficient melt temperature, or inadequate injection speed. Solutions involve improving mold venting, as well as increasing both the melt temperature and the mold temperature.

Dimensional Instability: Caused by fluctuations in mold temperature, insufficient holding pressure, or uneven cooling. It is necessary to maintain a stable mold temperature and optimize the holding pressure profile.

VI. Post-processing and Storage Guidelines

PA6+GF30 products are prone to moisture absorption; upon absorbing moisture, their toughness increases while their rigidity decreases slightly:

Moisture Conditioning: To ensure dimensional stability, products may be boiled in water for 1–2 hours or allowed to absorb moisture naturally.

Storage: Finished products should be stored in sealed packaging to prevent prolonged exposure to air, which can lead to moisture absorption and deformation.

We are a custom PA6+GF30 plastic part moulding moulding manufacturer, providing high-quality custom PA6+GF30 plastic part moulding moulding manufacturing. As long as you want to customize/develop custom PA6+GF30 plastic part moulding 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.

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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.