Electric scooter plastic body parts 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 electric scooter plastic body parts 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 electric scooter plastic body parts moulding products, we can make corresponding plastic parts, which is mainly done through injection molds.

Plastic body components for electric scooters—including front and rear fenders, side panels, deck casings, handlebar display housings, battery compartment shells, steering column covers, and rear wheel guards—are typically large, thin-walled, curved, and structurally integrated parts. These products must withstand prolonged outdoor exposure to sun and rain, temperature fluctuations, gravel impacts during riding, and continuous vibration. The battery compartment requires load-bearing capacity and explosion-proof capabilities; exterior parts must resist cracking after painting and avoid yellowing due to weathering; and structural components require impact resistance, dimensional consistency, and uniform assembly gaps. Mainstream raw materials fall into three categories: ASA or ABS+PC for exposed exterior parts; toughened, modified PP for load-bearing battery compartments and fenders; and high-transparency PC for transparent light covers and instrument lenses. The following section details the complete molding process, covering raw material pretreatment, mold installation and debugging, injection molding cycles, post-molding shaping, defect prevention, and quality inspection.

I. Raw Material Pretreatment Process

Raw Material Selection and Regrind Management

Virgin ASA or ABS+PC is selected for exterior body panels and handlebar housings due to UV resistance and good low-temperature toughness; toughened, filled PP is used for battery compartments and fenders for its impact resistance and moderate cost; and PC is used for transparent instrument covers.

For exterior body parts, only clean regrind (sprues/runners) of the same material is reused, with an addition ratio of ≤8%. Mixing recycled scrap into battery compartments or load-bearing connecting housings is strictly prohibited; recycled material reduces impact resistance, making parts prone to cracking under bumps or impacts and creating safety risks regarding battery damage.

During mixing, UV-resistant/weather-resistant masterbatches and hydrolysis-resistant, low-migration mold release agents are added to prevent "blooming" (whitening) caused by outdoor rain exposure. Flame-retardant materials and glass-fiber-reinforced materials are mixed and stored separately from exterior-grade materials to eliminate cross-contamination. Low-speed mixers are used for 8–12 minutes at speeds ≤300 rpm to prevent high-speed friction from degrading anti-aging additives.

Strict Drying and Dehumidification Standards

ASA, ABS+PC, and PC are highly hygroscopic; trace amounts of moisture can cause internal micro-bubbles, leading to large-scale paint delamination after coating and fracture propagation along bubble sites upon impact. ASA: Hot-air drying at 85°C for 4 hours; ABS+PC: Drying at 90°C for 5–6 hours; PC instrument cover: Dehumidifying drying at 110°C for 5 hours;

Modified PP: Dried at 60°C for 1 hour only during the high-humidity conditions of the rainy season to remove surface moisture. After drying, raw materials are conveyed to the hopper via sealed pipelines to prevent moisture absorption and secondary contamination from workshop oil mist.

Barrel Purging

Before switching raw materials or colors, a specialized purging compound is used to empty residual material from the barrel, preventing issues such as material mixing, color deviation, delamination, and reduced toughness.

II. Large Body Mold Installation and Design Essentials

The scooter body components are thin-walled parts with complex curvatures; the nominal wall thickness is 1.8–2.3 mm, while internal reinforcing ribs and mounting bosses are 4–6 mm thick. This significant variation in thickness makes the parts highly susceptible to shrinkage, warping, and inconsistent assembly gaps between the left and right side panels.

Mold Steel Selection

For ASA and ABS+PC exterior parts, the mold cavities utilize S136 corrosion-resistant mirror-finish steel, finely polished to be free of pits or scratches, ensuring stable paint adhesion. For filled PP parts, the mold cavities undergo overall nitriding treatment to withstand long-term abrasive wear from talc fillers. All internal and external corners feature radii of R1.5 or greater to eliminate stress concentrations and prevent cracking caused by vibration or thermal cycling. Parting line machining precision is maintained within 0.01 mm to minimize flash and prevent assembly hazards such as pinch points or excessive gaps.

Balanced Cooling System (Key to Controlling Warpage)

The mold employs symmetrical conformal cooling channels that follow the product's curvature, ensuring perfect symmetry between long and short sides and between the inner and outer surfaces. Spiral cooling inserts are installed within thick-walled mounting bosses to facilitate synchronized, balanced heat dissipation, thereby minimizing temperature differentials between thick and thin sections.

Zoned Mold Temperature Control: ASA side panels: 55–65°C; ABS+PC instrument housing: 70–80°C; Modified PP battery compartment: 30–40°C. Excessive mold temperature leads to intensified crystallization shrinkage, causing dimensional deviations in the left and right guard plates and uneven assembly gaps; conversely, excessively low mold temperature results in high residual internal stress, causing the housing to warp or deform under seasonal temperature fluctuations.

Optimization of Venting and Balanced Ejection

Given the long melt flow path of the body component, continuous, fine venting channels (0.012–0.015 mm deep) are incorporated at the ends of curved surfaces, along ribs, and at weld line locations to rapidly evacuate gases generated by melt decomposition, thereby preventing black specks and brittle failure at weld lines. A combination of symmetrical ejector pins and flat ejector pads is used on the inner side of the part to ensure uniform ejection force, eliminating localized stress marks (whitening) and surface deformation; additionally, dedicated small ejector blocks are installed for the snap-fit tabs to prevent breakage that could lead to assembly gaps.

Mold Commissioning and Setup Protocols

The single-cavity body mold is paired with a 500T–1000T injection molding machine, with clamping plates tightened evenly to withstand high injection pressures and prevent large-scale flash caused by mold opening (parting line separation). Water flow detectors are installed on cooling circuits to verify the absence of blockages or leaks; low-pressure mold-clamping protection is activated to trigger automatic mold opening in the event of obstructions (such as runners or foreign objects), thereby protecting the mirror-finish cavity. The mold is preheated for 30 minutes to ensure uniform and stable cavity temperature before conducting low-pressure, low-speed test shots. Injection parameters—including pressure, speed, and holding pressure—are iteratively adjusted; mass production commences only after the first article passes quality inspections regarding dimensions, appearance, and toughness. III. Standard Injection Molding Cycle Process

Complete single-mold cycle: Mold closing → Pre-plasticizing/material accumulation → Multi-stage injection filling → Two-stage holding pressure → Constant-temperature cooling/setting → Three-stage decelerated mold opening → Multi-stage low-speed ejection → Automatic part removal by robotic arm.

Precise zoned temperature control for the barrel

ASA body panels: 170–200°C; nozzle temperature must not exceed 210°C (excessive heat causes decomposition of UV-resistant additives, leading to short-term yellowing during outdoor exposure).

ABS+PC instrument housings: 190–250°C; upper limit not to exceed 260°C (high temperatures reduce low-temperature toughness, making parts prone to cracking upon impact in winter).

Toughened PP battery compartments and mudguards: 190–220°C (excessive heat causes filler powder to precipitate, resulting in surface white spots or "blooming").

PC transparent covers: 270–290°C.

Multi-stage variable-speed filling process

Curved body parts utilize a three-stage variable-speed filling process: low-speed buffering at the gate, medium-to-high speed filling for the main curved body, and reduced speed for venting at distant weld line areas to minimize internal stress caused by molecular shear. Injection pressure: 85–110 bar; excessively low pressure results in poor weld line fusion and breakage due to driving vibrations, while excessively high pressure leads to increased flash and internal stress accumulation, causing whitening or cracking when exposed to rain or temperature fluctuations.

Two-stage holding pressure

PP exhibits significant crystallization shrinkage, so a two-stage holding pressure profile is set to compensate for shrinkage; ASA and ABS+PC exhibit lower shrinkage, so low-pressure, short-duration holding is used. Holding time is 6–10s for thin-walled curved housings and 12–20s for thick-walled battery compartments and mounting bosses/clips to eliminate sink marks at ribs and mounting posts; holding pressure and material accumulation occur simultaneously to shorten the molding cycle.

Cooling and part removal specifications

Cooling time is calculated at 3–4s per 1mm of wall thickness; a standard 2mm body housing requires 9–13s of cooling. Inadequately cooled plastic parts may appear flat upon demolding but undergo continued shrinkage and deformation after 24 hours, leading to assembly misalignment and inconsistent gaps across the vehicle. The mold opening and ejection processes must be smooth and slow; robotic grippers are to be used for handling cosmetic parts, with manual contact on curved surfaces strictly prohibited to prevent fingerprints or oils from compromising paint adhesion. After removal, parts must be laid flat on specialized curved fixtures; stacking or compressing hot parts is strictly forbidden to avoid permanent warping of the curved surfaces.

We are a electric scooter plastic body parts moulding manufacturer, providing high-quality electric scooter plastic body parts moulding manufacturing. As long as you want to customize/develop electric scooter plastic body parts 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.