Ice maker 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 Ice maker 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 Ice maker moulding products, we can make corresponding plastic parts, which is mainly done through injection molds.

The plastic housing for ice machines is a large-scale injection-molded assembly that integrates aesthetic design, structural integrity, and environmental resistance. It primarily comprises the main housing, side covers, top cover, ice storage bin, drip tray, door panel, control panel, water inlet bracket, and other components. The operating environment is characterized by low temperatures and high humidity, frequent thermal cycling, prolonged exposure to water and condensation, and—in certain areas—the requirement for food-contact safety. Furthermore, given the large dimensions, thin walls, and numerous assembly interfaces of the housing, there are exceptionally stringent requirements regarding post-molding dimensional stability, deformation resistance, resistance to condensation-induced cracking, and surface aesthetics. The injection molding process must therefore be centered on preventing deformation caused by temperature differentials, ensuring water resistance and resistance to stress cracking, maintaining food-grade safety, achieving a high-gloss finish, and facilitating stable mass production. The specific key considerations for molding are outlined below.

Material selection prioritizes compatibility with low-temperature, high-humidity operating conditions. Common materials used for ice machine housings include high-impact ABS, heat-resistant ABS, modified PP, and food-grade PP. Visible exterior components—such as the main housing and door panels—primarily utilize ABS, which offers high gloss, good rigidity, stable shrinkage rates (0.5%–0.7%), and resistance to warping, making it ideal for large-surface aesthetic parts. Structural components—such as side covers, back panels, and bases—typically employ modified PP, which provides superior toughness, low-temperature resistance, hydrolysis resistance, and cost-effectiveness, while also being less susceptible to stress cracking caused by condensation. Components that come into direct contact with ice and water—such as the ice storage bin and drip tray—must be manufactured using food-contact-grade PP to ensure compliance with food safety standards; this entails being odorless, free of toxic leachates, and resistant to embrittlement at low temperatures. For certain high-end models, the control panels and decorative trim may utilize PC/ABS alloys, which offer enhanced impact resistance and effectively prevent whitening or cracking caused by temperature fluctuations. Finally, all materials used in water-contacting areas must possess hydrolysis resistance to prevent swelling, discoloration, or cracking when exposed to prolonged humid environments. Regarding raw material pretreatment: ABS and PC/ABS exhibit strong hygroscopicity and must be dried at 80–90°C for 3–4 hours, with moisture content controlled below 0.03%, to prevent the occurrence of silver streaks, bubbles, or matte finishes during molding. PP has low hygroscopicity and does not require extensive drying; however, in humid environments, it should be preheated at 70°C for one hour to eliminate surface moisture marks.

Mold design focuses on resolving issues related to the warping of large flat surfaces, demolding, assembly precision, and drainage structures. Ice maker housings typically feature large dimensions, shallow cavities, expansive flat surfaces, numerous snap-fits, and multiple mounting holes. The parting line is positioned along the maximum contour—specifically avoiding visible exterior areas—and the mold-closing clearance is controlled within 0.02 mm to minimize flash and burrs. The mold cavity and core are constructed using 718 or S136 mold steel, with surfaces polished to an Ra value of 0.02–0.05 μm to ensure the housing surface is smooth, free of weld lines, and easy to clean. For large-area housings, reinforcing ribs must be strategically arranged; rib thickness should be controlled at 50%–60% of the main wall thickness to prevent deformation caused by temperature differentials and the component's own weight during use. Mold dimensions must be precisely compensated based on the material's shrinkage rate—approximately 0.6% for ABS and 1.3%–1.8% for PP—to ensure uniform assembly gaps with the refrigeration unit, door frame, and inner liner, thereby preventing cold leakage and looseness. For plastic components featuring drainage structures—such as drip trays and ice storage bins—the mold cavity must be designed with a slight draft angle to prevent water accumulation and sticking during demolding.

The gating system primarily utilizes a hot runner configuration with multiple injection points; large housings employ a balanced two- or three-point injection strategy to shorten the flow path and minimize weld lines and internal stresses. Submarine gates or side gates are employed, positioned in concealed areas to avoid compromising the aesthetic appearance. The cooling system is critical for controlling deformation; water channels are distributed uniformly along the housing's contour, with increased density in large flat areas and thick-walled sections. Mold temperature fluctuations are controlled within ±3°C to ensure uniform cooling, thereby reducing warping and internal stresses. Particular emphasis must be placed on the venting design; vent grooves with a depth of 0.02–0.03 mm should be incorporated at corners, the ends of ribs, and weld line locations to prevent trapped gas burn marks, short shots, and voids. For undercut features on the housing sides—such as latches, grooves, and cable clips—sliders or angled lifters should be employed for core pulling to ensure smooth demolding without causing drag marks or stress whitening.

The injection molding process centers on achieving dimensional stability, preventing deformation, minimizing internal stress, and ensuring a high-gloss surface finish. Equipment selection involves injection molding machines with a clamping force of 200–600 tons, utilizing an injection volume equivalent to 1.2–1.5 times the product weight to ensure uniform plasticization and stable injection flow. Temperature settings are segmented: for ABS material, the barrel temperature is set to 220–260°C and the mold temperature to 50–70°C to enhance surface quality and reduce internal stress; for PP material, the barrel temperature is 190–220°C and the mold temperature is 40–60°C to balance crystallinity and mitigate the risk of low-temperature deformation. Injection speed employs a three-stage control profile: an initial low-speed phase prevents jetting; a mid-speed phase fills the main body of the part; and a final low-speed phase maintains pressure stability to prevent trapped gas and flash.

Injection pressure is set between 80–130 MPa, adjusted according to wall thickness and dimensional requirements, with pressure appropriately increased for large-surface-area housing components. Holding pressure is maintained at 60%–75% of the injection pressure for a duration of 12–25 seconds, specifically to compensate for shrinkage at assembly points and corners, thereby eliminating sink marks and depressions. Back pressure is set to 3–6 MPa to enhance melt homogeneity and prevent color variations or streaking. Cooling time is controlled between 25–45 seconds, depending on wall thickness, to ensure the product is fully solidified before ejection, thereby preventing deformation and sticking to the mold. Ejection is executed using a combined ejector plate and pin system to distribute force evenly, preventing stress whitening or raised marks on large flat surfaces.

Post-processing and quality inspection procedures are strictly aligned with the operational environment of the ice maker. Following molding, gates, flash, and burrs are removed; cosmetic parts are inspected for color variation, scratches, weld lines, and surface gloss; while structural components are checked for mounting hole spacing, flatness, and latch strength. Dimensional tolerances are controlled within ±0.05–0.1mm to ensure stable assembly. Reliability testing includes: low-temperature brittleness testing—withstanding exposure to a -10°C environment for 2–4 hours without cracking or deformation; and condensation testing—simulating high-humidity environments to verify the absence of stress whitening or water seepage. Components intended for food contact undergo specific odor and safety testing to ensure they are free of off-odors and do not leach toxic substances.

Regarding the prevention and control of common defects: Warpage on large flat surfaces is often caused by uneven cooling or improper holding pressure; this requires optimizing cooling channel layouts, extending cooling times, and adjusting mold temperatures. Sink marks and depressions typically result from overly thick ribs or insufficient holding pressure; solutions involve optimizing structural design and increasing holding pressure. Silver streaks and surface haziness are caused by moisture in the raw material; strict drying protocols must therefore be enforced. Prominent weld lines can be mitigated by increasing mold temperature and injection speed, as well as by enhancing venting. Flash (excess material) is caused by insufficient clamping force or mold wear; this necessitates increasing the clamping force and repairing the mold parting lines. Low-temperature cracking is frequently attributed to excessive internal stress; this issue can be remedied through annealing treatments or by reducing injection pressure.

Overall, the core focus of injection molding for ice machine plastic housings lies in controlling deformation caused by temperature differentials, preventing cracking in humid environments, ensuring food-grade safety, and enhancing dimensional stability. Through meticulous, end-to-end control—spanning materials, mold design, processing parameters, and quality inspection—the housing can be engineered to remain free of deformation, cracking, and yellowing, even under conditions of low temperature, high humidity, and prolonged exposure to ice and water. This ensures that the product meets the rigorous aesthetic, durability, and safety requirements for both commercial and residential ice machines.

We are a Ice maker moulding manufacturer, providing high-quality Ice maker moulding manufacturing. As long as you want to customize/develop Ice maker 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

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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.