FAQ

Professional Technical Q&A

Q1: How to scientifically maintain injection molds to extend their service life?
A: Professional mold maintenance is core to ensuring production efficiency and product quality. We recommend following this systematic process:

1. Daily Maintenance (Per Shift/Day):

   • Cleaning: After production, immediately use brass rods or specialized tools to remove resin residue and oil from the parting line, vent slots, and runners. Steel tools are strictly prohibited to prevent scratching the mold surface.

   • Lubrication: Check and lubricate all moving parts, such as ejector pins, sliders, guide pillars, and bushings, using specified high-temperature grease.

   • Rust Prevention: In humid environments or before long-term storage, spray specialized anti-rust agent on the molding surfaces.

2. Periodic Maintenance (Every 50,000-100,000 cycles or Monthly):

   • Disassembly Maintenance: Disassemble removable parts like sliders and ejector mechanisms. Perform thorough cleaning, inspect for wear, replace damaged springs or seals, and re-lubricate.

   • Water Line Maintenance: Use a dedicated cleaning machine or descaling agent to backflush the cooling channels, removing scale and impurities to ensure cooling efficiency. Check for leaks at hose connections.

   • Key Component Inspection: Inspect the condition of the locating ring, sprue bushing, and hot runner system (if equipped).

3. Storage: Molds should be numbered and stored on dry racks. Attach records of the last material used and maintenance performed. Ensure they are protected from dust and moisture.

Q2: What are the key inspection points for the daily maintenance of an injection molding machine?
A: Standardized daily maintenance significantly reduces failure rates and ensures stable production:

1. Pre-Startup Checks:

   • Lubrication System: Check the oil level in the lubricant reservoir and confirm all lubrication points (tie bars, moving platen shoes, etc.) are receiving oil properly.

   • Hydraulic System: Check hydraulic oil level and temperature (recommended 30-50°C). Observe if the oil color is clear.

   • Safety Devices: Verify the function of safety gates, emergency stop buttons, and mechanical safety locks.

2. In-Process Monitoring:

   • Listen/Look/Smell: Be alert for abnormal vibrations, noises, leaks (oil, water, air), or burning smells.

   • Parameter Monitoring: Watch key process parameters like temperatures, pressures, and clamping force for stability.

3. Post-Shutdown Maintenance:

   • Cleaning: Purge residual melt from the barrel (if changing material) and clean the nozzle. Wipe oil and dust from the machine surface.

   • Tightening: Check fastening bolts on critical components, such as tie bar nuts and injection unit connections.

   • Power Down: For extended downtime, shut off the main power and apply rust prevention measures.

Q3: What is the standard procedure and key precautions for replacing engine coolant (antifreeze)?
A: Correct coolant replacement is vital for the engine's cooling system:

1. Preparation: Ensure the engine is completely cool. Obtain coolant that meets the vehicle manufacturer's specified type (note freeze point, boil point, compatibility) and distilled water (if dilution is needed).

2. Drain Old Coolant: Open the radiator cap (or expansion tank cap). Locate the drain plug on the bottom of the radiator or engine block to drain the old fluid. Some models require hose removal.

3. System Flushing (Recommended): If the old fluid is dirty or scale is present, use a dedicated flushing agent with distilled water to circulate and clean the system until clear water runs out.

4. Refilling & Bleeding:

   • Close the drain valve. Slowly fill the system with new coolant through the radiator neck until full.

   • Start the engine and let it idle. Turn the vehicle's heater to the highest temperature and fan speed to help purge air from the system.

   • Observe the coolant level, topping up as it drops until it stabilizes at the "MAX" line and the upper/lower radiator hoses feel uniformly warm.

5. Key Precautions:

   • Never Mix: Coolants of different colors/formulations may have incompatible chemistries. Mixing can cause precipitate or corrosion.

   • Regular Replacement: Typically every 2 years or 40,000-60,000 miles, but always consult the owner's manual.

   • Proper Disposal: Used coolant is toxic. Dispose of it according to local regulations at a proper recycling facility.

Q4: How is "Automatic Powder Compaction Pressure" controlled in heating element manufacturing, and why is it critical?
A: "Automatic powder compaction pressure" is a core process parameter in heating element manufacturing, controlled precisely by automated equipment.

1. Control Principle: On fully automatic filling machines, magnesium oxide powder (MgO) is fed into the metal sheath containing the resistance wire. The machine applies a programmed, stable pressure via pneumatic or mechanical vibration devices during and after the filling process, compacting the powder multiple times within the tube.

2. Critical Importance:

   • Ensures Insulation: Adequate pressure eliminates air gaps between powder particles, increasing density. This significantly improves insulation resistance and dielectric strength, preventing breakdown.

   • Optimizes Thermal Conductivity: Highly compacted MgO powder ensures optimal heat transfer from the resistance wire to the metal sheath, enhancing thermal efficiency and lifespan.

   • Guarantees Consistency: Automated pressure control eliminates human variability, ensuring uniform performance across every heating element.

   • Prevents "Powder Shrinkage": Fully compacted powder is less likely to form voids due to thermal expansion and contraction during subsequent processing or use.
     This parameter is precisely set by the production equipment and requires no user adjustment. However, it is a key intrinsic indicator of a heating element's quality grade.

Q5: When using a tire changer for mar-free demounting, how to effectively prevent damage to rims and brake calipers?
A: Professional mar-free demounting requires proper technique and correct equipment setup:

1. Equipment Selection & Setup:

   • Use Nylon Mount/Demount Tools or Protectors: Ensure the tire changer's mounting head is made of nylon or fitted with a dedicated protector to avoid direct metal-to-rim contact.

   • Adjust Clamping Arms: Use clamping arms (preferably rubber or nylon-coated) that match the inner contact surface of the rim. Ensure they grip only the rim's reinforced bead seat area, not the fragile face or outer edge of the wheel spokes.

2. Standard Operating Procedure:

   • Adequate Lubrication: Apply generous amounts of tire lubricant to the tire bead and rim contact area.

   • Precise Positioning: Position the demount tool at the rim's "safety hump" or designated area (typically 0.5-1 cm from the rim edge), avoiding contact with the spoke surface.

   • Protect Valve Stem: Remove the valve core before starting. Be mindful during rotation to avoid scraping the tool or tire against the valve stem.

   • Protect Calipers (for wheel removal from vehicle): Before attempting to pull the wheel off the hub, if clearance is tight, insert a plastic spacer between the rim and the brake caliper to prevent the rim from scratching the caliper piston or surface.

3. Key Technique: Use the machine's power for slow, controlled force application. Never use excessive force or improvised levers. Exercise extreme caution with high-end, polished, or machined-face wheels.

Q6: What are the standardized construction points for concealed water pipe installation in home decoration?
A: Concealed water pipe installation is critical hidden work and must follow high-standard construction codes:

1. Design & Planning: Precisely locate all water points and draft a layout diagram. Principle: Pipes run in ceilings when possible (easier for future access), avoid long horizontal chases in walls (compromises structure). Maintain a minimum 150mm separation between hot and cold water lines.

2. Material Inspection: Use branded PPR pipes for hot water (thicker wall). Pipes and fittings must be from the same brand. Verify anti-counterfeit marks.

3. Chasing & Installation:

   • Wall chase depth must allow the pipe to be embedded with sufficient covering by the plaster layer (typically, pipe surface should be ≥10mm from finished wall).

   • Pipes must be secured with dedicated pipe clamps at standard intervals (e.g., ≤600mm for cold water, ≤300mm for hot water) to prevent vibration and movement from water hammer.

   • Always use protective sleeves where pipes pass through walls or floors.

4. Thermal Fusion Jointing:

   • This is the most critical step. Use a qualified PPR fusion welder and strictly set the heating temperature (typically 260°C ±5°C) and heating time according to pipe diameter.

   • Do not rotate during insertion. Aim for a uniform "double-bead" fusion collar. Allow sufficient cooling time after joining.

5. Pressure Test (Hydrostatic Test):

   • Upon completion, a pressure test is mandatory. Use a test pump to raise system pressure to 1.5 times the working pressure (generally not less than 0.8 MPa / 8 bar).

   • Maintain this pressure for no less than 30 minutes. The test is passed only if the pressure drop is ≤0.05 MPa and no leakage is found at any joint or along any pipe.

6. Documentation & Archiving: Take comprehensive photos or video of the completed pipe routes. Provide these records along with the layout diagram to the homeowner as a future "utility map" for maintenance.

About the Product
Q1: Are your products authentic?
A: Absolutely! We guarantee that all products are 100% authentic (custom-made according to our company's quality standards) and come with comprehensive warranty services. Please rest assured when making a purchase.

Q2: Where can I find the product dimensions/specifications?
A: Detailed size charts, specification tables, material descriptions, and usage recommendations are provided on each product's detail page. Please review this information carefully before purchasing. If you have any uncertainties, feel free to contact our customer service.

Q3: Are there color differences between product images and the actual items?
A: We strive to photograph products under natural lighting to present colors as accurately as possible. However, due to variations in display brands and settings, slight color differences may occur. This is not considered a product quality issue, and we appreciate your understanding.

Q4: Why didn't the similar product I bought elsewhere, after seeing your promotional video, work at all?
A: All our products are custom-manufactured to our company's standards, utilizing materials and manufacturing specifications that comply with industrial-grade requirements. Our primary clientele consists of industrial users, and our products must withstand long-term, high-intensity use in factory settings. Consequently, our products are fundamentally different in terms of durability and performance from similar-looking items sold through other market channels, which is key to guaranteeing their effectiveness.

II. About Orders & Payment
Q1: How can I check my order status?
A: You can log into your account on the website and navigate to "My Orders" to view real-time status updates (e.g., Pending Payment, Shipped, In Transit).

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Q3: Can I modify the shipping address or cancel an order after placing it?
A: If your order has not yet entered the "Shipped" status, you may contact our customer service to request modifications or cancellation. Once an order has been packed and shipped, we will be unable to intercept it. Please double-check your shipping information before confirming your order.

III. About Shipping & Logistics
Q1: What are the shipping costs, and how long will delivery take?
A: Free shipping worldwide. Orders are typically processed and shipped within 1–3 business days. Estimated delivery times are as follows:

• Major global cities: 7–30 days

• Small to medium cities: 15–45 days

• Other cities: 20–60 days
  Delivery times may vary depending on your location.

Q2: Do you offer international shipping?
A: Yes, we ship to all countries worldwide.

Q3: Can I specify a preferred courier company?
A: To ensure efficient and consistent order processing, we automatically assign the fastest available shipping carrier based on your address. We do not accept specific courier requests at this time. Thank you for your understanding.

IV. About Returns, Exchanges & After-Sales Service
Q1: Can I return or exchange a product if I'm not satisfied?
A: We offer a 30-day no-reason return & exchange policy (please note that certain items, such as customized products and sanitary products, may be excluded). To be eligible, items must be unused, with original tags attached and packaging intact. For detailed procedures, please refer to our Return & Exchange Policy.

Q2: Who covers the return shipping cost?
A: For returns or exchanges not due to product quality issues, shipping costs are the customer's responsibility. If the return is a result of our error (e.g., wrong item shipped or product defect), we will cover all related shipping fees.

Q3: What should I do if the product has a quality issue?
A: We take this very seriously! Within 30 days of receiving the product, please contact our customer service with photo or video evidence. Once verified, we will promptly arrange a return or exchange and cover all associated shipping costs.

V. Other Questions
Q1: How can I contact customer service?
A: You can reach us through the following channels:

• Live Chat: Available on weekdays from 9:00 AM to 6:00 PM (Beijing Time). Click the chat icon at the bottom right of the website.

• Email: linnidianzi@sina.com (We respond within 24 hours)

• WhatsApp: +13884481640

Q2: Do your products come with a warranty?
A: Yes, all products come with a warranty covered by our company and include a warranty card. Warranty periods and terms may vary by product. Please refer to the product description or contact customer service for details.

Q3: What should I do if I receive a damaged or incorrect item?
A: Please contact our customer service team within 48 hours of delivery. Provide your order number, along with photos or a video of the issue. We will assist you in resolving the matter as quickly as possible.

Q4: Can I track my order in real time?
A: Yes! Once your order is shipped, you will receive a tracking number via email. You can use this number to monitor your package's delivery status on the courier's official website.

Q5: Do you offer bulk or corporate orders?
A: Yes, we provide special pricing and customized services for bulk or corporate orders (for single SKU quantities of 1000 pieces or more). Please contact us via email or WhatsApp for further assistance.