Laptop exterior components (A-shell, C-shell, D-shell) are typical large-size, thin-walled plastic parts, typically with a wall thickness between 0.8-1.2mm. Exterior surface requires a high-gloss, flawless finish or a finely textured matte finish, while internal structure is densely packed with boss pillars, clips, reinforcing ribs, etc., making molding difficult and time-consuming. Molding cycle for ordinary laptop shell molds in industry is generally 25-30 seconds, and for some large models (16 inches and above), it even exceeds 35 seconds. In today's fiercely competitive laptop industry with continuously pressured profit margins, every 1-second reduction in molding cycle means a 3%-4% decrease in injection molding cost per unit, and an increase in annual production capacity of over 300,000 units per production line. Economic value of cycle optimization is extremely considerable.

 

Many factories attribute long molding cycles to "slow cooling of thin-walled parts, there's no other way," resorting to increasing number of injection molding machines to boost production capacity, resulting in high equipment and space costs. However, in reality, cooling time accounts for 60% to 70% of laptop casing molding cycle. Real bottleneck isn't filling and holding pressure, but cooling. Traditional molds use straight-line drilled cooling water channels. For curved casings and complex internal structures, distance between water channels and cavity surface varies, leading to insufficient cooling over large areas. Thick-walled areas like bosses and clips are particularly difficult to cool, requiring extended cooling time to prevent product deformation and warping.
Emergence of conformal cooling technology provides a fundamental solution to this problem. Through 3D printing or precision machining, cooling water channels are arranged to conform to curved contours and internal structure of product, ensuring a uniform distance from water channels to cavity surface. This results in a consistent cooling rate at every location, significantly shortening cooling time, reducing warping and shrinkage caused by uneven cooling. A leading mold manufacturer has reduced molding cycle of laptop casings from 28 seconds to 19 seconds through a systematic conformal cooling design, improving cooling efficiency by over 40%, while also enhancing product yield and appearance quality.
This article starts with bottleneck in molding cycle of thin-walled laptop casings, systematically dissecting design principles, six core design points, manufacturing processes, and verification methods of conformal cooling. Combined with mass production project experience, it examines how the 9-second cycle reduction was achieved through cooling system reconstruction.

To reduce time from 28 seconds to 19 seconds, we must first understand where those 28 seconds are spent. Molding cycle of a laptop casing consists of mold closing, injection molding, pressure holding, cooling, mold opening, ejection, part removal, with cooling time being the largest component.
1. Cycle Breakdown: Cooling Time Accounts for Over 60%
Taking a typical 14-inch laptop A-shell mold as an example, material is PC+ABS, wall thickness 1.0mm, high-gloss finish required, traditional straight-line water cooling, molding cycle 28 seconds. Time breakdown for each stage is as follows: Mold Closing: 1.5 seconds; Injection Filling: 2.0 seconds; Holding Pressure: 4.0 seconds; Cooling: 16.5 seconds; Mold Opening: 1.5 seconds; Ejection + Part Removal: 2.5 seconds.
Cooling time, 16.5 seconds, accounts for 59% of the entire cycle. If cooling during holding pressure stage is included (product is also cooling during holding pressure), actual cooling-related time exceeds 20 seconds, accounting for over 70%. Times for filling, mold closing, mold opening, and ejection have been optimized to near physical limits, with very little room for further compression; however, cooling time has enormous room for optimization and is core breakthrough point for cycle reduction.
2. Three Major Cooling Defects of Traditional Straight-Line Water Channels
Traditional molds use deep-hole drilling for straight-line cooling channels, resulting in only straight-line channels. For products with large curved surfaces and multiple structures, such as laptop casings, this presents three fatal defects:
Defect 1: Uneven water channel distance in curved areas, leading to insufficient cooling over large areas
Laptop A-shell has a curved surface. Straight-line water channels can only be drilled in a flat plane. Distance from water channel to top of curved surface might be only 8mm, but distance to bottom could be over 20mm. Areas further away cool slowly, requiring sufficient time for solidification before ejection; otherwise, deformation will occur. The overall cooling time of product is determined by the slowest-cooling areas, and insufficient cooling over large areas directly forces a longer cooling time.
Defect 2: Boss Pillars and Clips are Cooling Dead Zones
Laptop casing contains dozens of boss pillars (screw pillars) and clips. These areas have relatively thick walls (typically 1.5~2.5mm), resulting in concentrated heat and limited surrounding space. Traditional straight water channels cannot reach these areas, making them typical cooling dead zones. Insufficient cooling inside boss pillars can lead to surface shrinkage, ejection deformation, and even heat buildup causing air bubbles. To ensure adequate cooling in these areas, the overall cooling time must be significantly extended.
Defect 3: Mismatched Cooling Between Moving and Fixed Molds, High Risk of Warpage
Moving mold side (internal structural surface) of laptop casing has numerous boss pillars and reinforcing ribs, resulting in a large surface area and high heat generation. Fixed mold side (exterior surface) is a smooth curved surface with a relatively small surface area. Traditional water channels are often symmetrically arranged on both sides without considering different heat loads on each side. This leads to insufficient cooling on moving mold side and excessive cooling on fixed mold side, resulting in a large temperature difference and causing product to bend towards slower-cooling side, causing warpage. To control warpage, cooling efficiency must be reduced and cooling time extended, allowing temperatures on both sides to decrease slowly and synchronously.

 

3. Chain Reaction Problems Caused by Uneven Cooling: More Than Just Longer Cycles
Uneven cooling in traditional water-cooling systems not only leads to longer cycle times but also introduces a series of quality issues:
Warpage and Deformation: Uneven cooling results in uneven shrinkage, with large flat surfaces warping by 0.3~0.5mm, affecting assembly and surface flatness; Shrinkage Marks: Slow cooling in thick-walled areas such as bosses and clips causes noticeable shrinkage marks, rendering high-gloss parts unusable; Color Difference: Different cooling rates lead to differences in material crystallinity or gloss, resulting in visible water ripples or color differences on surface; Dimensional Instability: Fluctuations in cooling conditions cause fluctuations in shrinkage rates, leading to batch-to-batch instability in critical dimensions, requiring frequent machine adjustments.
These quality issues further reduce yield rates and increase rework and scrap costs. Conformal cooling not only shortens cycle time but also simultaneously solves these quality problems, offering multiple benefits.

Core idea of conformal cooling is simple: shape of cooling water channels follows contour of product, ensuring distance from water channels to cavity surface is equal everywhere, resulting in a consistent cooling rate at every location. However, its implementation is not simple, requiring a deep understanding of product heat distribution, water channel fluid dynamics, mold structure.
1. Conformal Cooling vs. Traditional Cooling: Fundamental Difference in Heat Exchange Efficiency
Essence of cooling is conduction of heat from cavity surface through mold steel to cooling water channels, where it is then carried away by cooling water. Heat transfer efficiency is inversely proportional to square of distance—reducing distance from water channel to cavity surface from 20mm to 10mm increases heat transfer efficiency by four times.
Average distance from traditional straight water channels to cavity surface is approximately 15-25mm, and this distance is uneven; distance from conformal water channels to cavity surface can be stably controlled at 8-12mm, and is equal everywhere. Halving average distance increases heat transfer efficiency by 3-4 times, naturally leading to a significant reduction in cooling time. More importantly, conformal cooling ensures a consistent cooling rate across all locations, resulting in uniform product shrinkage and solidification. It eliminates need to extend the overall cooling time by waiting for a specific cooling dead zone. Cooling time is transformed from "cooling time of the slowest location" to "average cooling time of all locations," significantly reducing cycle time.
2. Implementation Methods of Conformal Cooling: Combination of 3D Printing and Precision Machining
Conformal water channels cannot be machined using traditional deep-hole drilling. They are primarily achieved through two methods:
Method 1: 3D Printed Conformal Cooling Inserts: Area requiring conformal cooling is designed as an independent insert, fabricated using metal 3D printing (SLM, Selective Laser Melting). Internal water channels can be bent arbitrarily, perfectly conforming to cavity contour. Commonly used materials are mold steels (such as 1.2709, CX). After printing, heat treatment and precision machining are performed, achieving a hardness of HRC50 or higher. 3D printing is suitable for complex curved surfaces, deep cavities, and locations around bosses where traditional machining methods cannot achieve conformal water channels.
Method 2: Precision Machining and Assembling Water Channels: For areas with low curvature, cavity plate can be machined in layers, with each layer milled to create a semi-pipe water channel. These layers are then assembled and welded together to form a conformal water channel. Alternatively, a combination of copper alloy inserts and deep-hole drilling can be used. High thermal conductivity copper alloy is embedded in key locations, working in conjunction with deep-hole water channels to achieve near-conformal cooling. Precision machining is less expensive, but complexity of water channel is limited.
In actual projects, a combination of "3D printing + precision machining" is typically used—3D printed inserts are used for complex curved surfaces and boss pillar areas, while precision-machined water channels are used for large, regular areas, balancing cooling effectiveness and cost.
3. Benefits of Conformal Cooling: Triple Improvement in Cycle Time, Quality, and Cost
A well-designed conformal cooling mold offers benefits in three aspects compared to traditional water-cooled molds:
Molding cycle reduced by 25%~40%: Cooling time is reduced by 40%-50%, with the overall cycle time decreasing from 28 seconds to 19-21 seconds, and single injection molding machine capacity increased by 30%~50%; Product yield improved by 5%~15%: Uniform cooling reduces warpage and shrinkage, resulting in more stable appearance quality, and yield increasing from 85% to over 95%; Overall cost reduced by 20%~30%: Shorter cycle time reduces per-part injection molding costs, improved yield reduces scrap, and increased capacity reduces equipment investment, resulting in a significant decrease in overall costs.
Taking a notebook casing project with an annual production capacity of 1 million units as an example, cycle time was reduced from 28 seconds to 19 seconds, injection molding cost per unit decreased by approximately 0.8 yuan, resulting in annual savings of 800,000 yuan; yield rate increased by 8%, reducing scrap by approximately 60,000 units annually, saving approximately 300,000 yuan; and increased production capacity eliminated need for one injection molding machine, saving approximately 200,000 yuan annually in equipment depreciation and site costs. The total annual savings from these three items exceed 1.3 million yuan, and increased cost of conformal cooling molds can typically be recovered within 3-6 months.

Conformal cooling is not simply "bending water channels into product shape," but a systematic engineering project involving thermal analysis, fluid design, mold structure, and manufacturing processes. Following six design principles determine final effect of conformal cooling.
Principle 1: Uniform Distance from Water Channels to Cavity, 8-12mm is Optimal Range
Core design principle of conformal cooling is that distance from water channels to cavity surface is equal everywhere. Excessive distance results in low cooling efficiency; insufficient distance leads to insufficient mold strength and potential water channel leakage.
Design Parameters: Distance from water channel to cavity surface: Recommended 8-12mm, adjusted according to product wall thickness and mold steel thermal conductivity. 8-10mm for thin-walled parts (<1mm), 10-12mm for thick-walled parts (>1.5mm). Distance deviation ≤ ±1mm to ensure uniform cooling; Water channel spacing: Recommended center-to-center distance between adjacent water channels is 3-5 times channel diameter, typically 12-20mm. Excessive spacing creates cooling blind spots between channels; insufficient spacing results in too many channels and complex mold structure. Thermal analysis confirms no cooling dead zones within water channel coverage area; Water channel diameter: Recommended 4-8mm, determined based on cooling water volume and flow rate requirements. Too small a diameter results in high water flow resistance and potential blockage; too large a diameter affects mold strength. For large areas of laptop casing, use 6-8mm cooling; for smaller areas like boss pillar, use 3-4mm.
Design Method: Offset a curved surface 10mm from cavity surface from 3D model of product. Arrange water channels along this offset curved surface, ensuring uniform spacing; For areas with drastic surface changes, design water channels in segments, each maintaining an equidistant relationship with cavity surface; Use rounded transitions at water channel bends, with a turning radius ≥ twice water channel diameter to reduce water flow resistance and pressure loss.
Principle 2: Differentiated Cooling Between Moving and Fixed Molds, Matching Heat Loads on Both Sides
Structure and heat load on two sides of moving and fixed molds of laptop casing differ significantly. A simple symmetrical arrangement of water channels is insufficient; separate designs are needed based on heat load on each side.
Fixed Mold Side (Appearance Surface): Appearance surface is a smooth curved surface with a relatively uniform heat load, but high appearance quality is required. Cooling needs to be stable and uniform to avoid uneven surface gloss or water ripples caused by excessively rapid cooling; Distance from water channels to cavity is slightly larger (10-12mm), providing moderate cooling intensity and ensuring slow, uniform cooling of outer surface for a consistent gloss; Water channel spacing is uniform, covering the entire outer surface with no cooling blind spots.
Moving mold side (structural surface): This side contains numerous boss pillars, clips, and reinforcing ribs, resulting in a large surface area and high heat load, requiring stronger cooling; Distance from water channels to cavity is slightly smaller (8-10mm), providing greater cooling intensity and quickly removing heat from structural surface; Focus on cooling boss pillars and clip locations (see principle 3).

 

Temperature difference control between two sides: Cooling power of moving and fixed molds is matched according to heat load ratio; typically, cooling area on moving mold side is 20%-30% larger than that on fixed mold side; Under stable mass production conditions, temperature difference between moving and fixed mold cavity surfaces is controlled within 5℃ to prevent warping due to excessive temperature differences; Temperature on both sides is monitored in real time using a mold temperature sensor, with independent temperature control as needed.
Principle 3: Focus on Cooling BOSS Pillar and Clips to Eliminate Cooling Dead Zones
BOSS pillar and clips are the most stubborn cooling dead zones in laptop casings, main culprits for shrinkage and long lead times. Conformal cooling requires specific design for these areas.
BOSS Pillar Cooling Solutions: Annular Conformal Water Channel: A circular cooling water channel is designed around BOSS pillar core, encircling pillar and positioned 3-5mm from outer wall, directly cooling pillar's heat. Circular water channel is implemented using a 3D-printed insert; Central Cooling Pin: For BOSS pillars exceeding 8mm in height, a cooling pin (made of beryllium copper with internal cooling water channels) is inserted at the center of core, dissipating heat directly from within pillar. This cooling efficiency is higher than external circular water channel; Beryllium Copper Inserts: BOSS pillar core is made of high thermal conductivity beryllium copper, which has a thermal conductivity 3-4 times that of mold steel. This allows for rapid heat transfer from BOSS pillar's interior to surrounding water channels, achieving efficient cooling in conjunction with external water channels.
Snap-in Cooling Solution: Snap-in locations are typically at the edge of shell, where space is limited. Localized conformal water channels or beryllium copper inserts are used for cooling; Snap-in core is made as an independent insert, with internal cooling water channels or embedded cooling pins to directly cool the snap-in location; Multiple snap-in locations can be connected by a series of conformal water channels for individual cooling.
Thick-Walled Area Cooling: For locally thick-walled areas of shell (such as mounting bases and connection points), beryllium copper inserts are embedded to accelerate cooling, or dense water channels are added below thick-walled area to balance cooling rate between thick and thin areas. All hot spots (areas with temperatures 10℃ or higher than average temperature) are identified through thermal analysis, and each hot spot has corresponding enhanced cooling measures.
Principle 4: Water Flow Design – Precise Matching of Velocity, Flow Rate, and Pressure
Cooling effect of conformal water channels depends not only on layout but also on water flow state. Cooling water must be kept in a turbulent state to efficiently remove heat; cooling efficiency drops by more than 50% in laminar flow.
Water Flow Parameter Design: Reynolds Number Re ≥ 4000: Ensures cooling water is in a turbulent state for the highest heat exchange efficiency. Calculate Reynolds number based on water channel diameter and flow rate: Re = ρvd/μ, where ρ is water density, v is flow velocity, d is pipe diameter, and μ is dynamic viscosity; Flow Velocity 1.5~3.0 m/s: Recommended velocity range, ensuring turbulence without excessive water pressure or water channel erosion. Flow velocities below 1 m/s easily enter laminar flow region, causing a sharp drop in cooling efficiency; Inlet/outlet water temperature difference ≤ 3℃: Temperature rise of cooling water flowing through water circuit should not exceed 3℃, ensuring uniform cooling temperature throughout the entire water circuit. If temperature difference is too large, it indicates insufficient water flow, requiring increased flow or branching; Water circuit pressure drop ≤ 0.3MPa: Pressure loss of the entire water circuit should be controlled within a reasonable range to avoid excessive water pressure leading to mold leakage or excessive pump power.
Water circuit layout: Parallel connection preferred: Parallel layout is preferred for cooling water circuits. Each loop should have similar length and flow rate, and flow rate of each loop should be independently adjustable. Parallel layout results in lower pressure loss and more uniform temperature across loops; Avoid long-distance series connection: The longer series water circuit, the higher water temperature at the end, and the less uniform cooling. If series connection is necessary, length of a single water circuit should not exceed 1.5 meters, and inlet/outlet water temperature difference should be ≤ 3℃; Alternating Inlet and Outlet Arrangement: Alternating inlets and outlets on mold prevent one side from being entirely cold water while the other is entirely hot water, ensuring uniform surface temperature of cavity.
Principle Five: 3D Printed Insert Design – Balancing Material, Precision, and Strength
3D printing is core method for realizing complex conformal cooling channels, but design of 3D printed inserts has its own unique characteristics, requiring a balance between cooling effect, printing precision, and mold strength.
Material Selection: Martensitic Aging Steel (1.2709/MS1): The most commonly used 3D printing mold steel, with good printing performance, a hardness of HRC50~54 after heat treatment, and high strength, suitable for most conformal cooling inserts; CX Stainless Steel: Corrosion resistant, good polishability, suitable for molds requiring high-gloss finishes and corrosion resistance; Copper Alloy: High thermal conductivity, but lower strength, suitable for cooling inserts rather than forming surfaces; For laptop casing exteriors requiring a mirror finish, CX or other highly polishable materials should be prioritized, followed by mirror polishing after printing.
Printing Accuracy and Post-Processing: 3D printing typically requires a dimensional accuracy of ±0.1mm. Forming surface must undergo CNC precision machining to achieve an accuracy of 0.005mm; printed surface cannot be directly used as forming surface; Post-printing heat treatment (solution + aging) is performed to eliminate internal printing stress, improve hardness and strength; Internal water channels undergo fluid polishing or abrasive flow machining to remove printing powder residue and surface roughness, reducing water flow resistance; Mating surfaces of inserts and template are precision ground to ensure fit accuracy and sealing.
Structural Strength Design: Distance from water channels to forming surface cannot be too small (≥ 5mm), otherwise cavity surface may deform or crack during high-pressure injection; Wall thickness of 3D printed inserts must be sufficient to prevent elastic deformation under injection pressure. Strength checks are performed at critical stress points; O-rings or copper seals are used to seal insert and mold plate to prevent cooling water leakage. Seals should be positioned away from high-temperature areas to avoid aging and failure.
Principle Six: Cooling Simulation Verification – Data-Driven Design, Not Guessing Based on Experience
Conformal cooling design cannot rely on experience; it must be quantitatively analyzed using professional cooling simulation software to verify cooling effect and uniformity of design.
Simulation Analysis Content: Temperature Field Analysis: Simulates temperature distribution on the cavity surface under stable mass production conditions, identifying hot and cold spots. Temperature difference across the entire cavity should be ≤ 5℃ (≤ 3℃ for high appearance requirements); Cooling Time Analysis: Calculates cooling time required for product to reach ejection temperature and compares it with traditional water cooling systems to verify cycle reduction effect; Warpage Analysis: Couples cooling analysis and structural analysis to predict warpage of product under conformal cooling conditions, confirming that warpage is within tolerance; Water Flow Analysis: Simulates flow velocity, pressure, and temperature distribution in water system, confirming turbulent flow, absence of dead zones, and acceptable inlet/outlet water temperature difference.
Simulation Iterative Optimization: After simulating initial design, water channel layout is optimized based on temperature field results—increasing density or reducing distance of water channels in hot spots, and decreasing distance or increasing distance of water channels in cold spots. Typically, 2-3 rounds of simulation iterations are needed to obtain optimal solution with uniform temperature and efficient cooling. Only after successful simulation does 3D printing and processing begin, avoiding need to remake product if problems are found after printing, saving time and costs.

Manufacturing process of conformal cooling molds is more complex than traditional molds. Each step, from 3D printing inserts, precision machining, sealing assembly, to debugging and acceptance, has specific requirements and must be strictly controlled to ensure design effect is implemented.
1. Manufacturing Process
Mold Design and Cooling Simulation: Complete mold structure design and conformal water channel design, and pass simulation verification; 3D Printing Inserts: Print conformal cooling inserts, followed by heat treatment, precision machining, and fluid polishing; Mold Plate Machining: Machining cavity plate and core plate, machining water channel interfaces and insert mounting positions; Insert Assembly: 3D printed inserts are installed into template, mating surfaces are ground, sealing rings are installed, and water system is pressure tested; Mold Assembly: Guide pillars, ejector pins, sliders, other mechanisms are assembled, and mold is fitted; Water System Debugging: Cooling water is connected, flow rate, pressure, and leakage of each circuit are tested; Trial Molding Verification: Mold is tested on machine to check molding cycle, product dimensions, appearance, and warpage; Mass Production Handover: After small-batch verification and stabilization, product is handed over for mass production.
2. Acceptance Standards
Water System Sealing: Water system is pressurized to 0.5MPa and held for 30 minutes; no leakage is observed; Flow Rate and Velocity: Flow rate of each circuit reaches design value, velocity is ≥ 1.5m/s, temperature difference between inlet and outlet water is ≤ 3℃; Temperature Uniformity: After mold reaches the working temperature, an infrared thermal imager scans cavity surface; temperature difference across the entire cavity is ≤ 5℃; Molding Cycle: Continuous production of 50 molds achieves an average molding cycle time meeting design target (e.g., 19 seconds), with cycle fluctuation ≤ ±0.5 seconds; Product Quality: Product dimensions are qualified, no shrinkage marks on the surface, warpage ≤ 0.15mm (laptop casing standard); Mass Production Stability: Continuous production of 1000 molds maintains stable cycle time and quality, with no abnormalities such as water channel blockage or leakage.

 

Q1: How much higher is the cost of a conformal cooling mold compared to a traditional mold? Is it worth investment?
A: Conformal cooling molds typically cost 15%-30% more than traditional molds due to need for 3D-printed inserts and more complex water channel designs. However, considering 30% reduction in molding cycle time, 8%-12% improvement in yield, reduced equipment investment due to increased production capacity, the overall cost decreases by 20%-30%, and increased mold cost can usually be recovered within 3-6 months. For high-volume, long-lifecycle laptop casing projects, return on investment for conformal cooling is very high, making it worthwhile. For small-volume, short-lifecycle projects, localized conformal cooling (used only in hot spots such as BOSS pillars) can be evaluated and selected to reduce investment.
Q2: What about lifespan and wear resistance of 3D-printed inserts? Will there be problems during mass production?
A: After heat treatment, hardness of 3D printing mold steel can reach HRC50-54, and its wear resistance is comparable to that of traditional mold steel. With proper design (distance from water channels to molding surface ≥ 5mm, sufficient wall thickness) and adequate post-processing (stress relief through heat treatment, fine machining of molding surface), lifespan of 3D printed inserts can reach 500,000-1,000,000 molds, meeting mass production needs of laptop casings. During mass production, it's crucial to regularly clean water channels (every 200,000-300,000 molds with a specialized cleaning agent) to prevent scale buildup that could affect cooling performance.
Q3: Will conformal cooling increase internal stress in product?
A: No. Conformal cooling allows for uniform cooling, actually reducing internal stress caused by uneven cooling. Traditional water channels result in uneven cooling, leading to asynchronous curing and high internal stress in different parts of product; conformal cooling provides uniform cooling, resulting in lower internal stress and more stable product dimensions. However, it's important to avoid excessively fast cooling rates, as this can cause surface stress or uneven gloss on thin-walled surfaces due to rapid cooling. Cooling intensity on fixed mold side (appearance surface) should be moderate, with a slightly larger water channel distance to ensure slow and uniform cooling of appearance surface.
Q4: What if conformal cooling water channels become clogged? How to maintain it?
A: Conformal cooling systems, due to their complex paths and smaller diameters, are indeed more prone to scaling and clogging than traditional cooling systems. Maintenance measures include: 1) using treated cooling water (deionized water or with added rust inhibitors) to reduce scale buildup; 2) regular cleaning, using a dedicated cooling system cleaner for 30-60 minutes every 200,000-300,000 mold runs to remove scale and impurities; 3) installing a cooling system filter to prevent impurities from entering. For localized clogging, high-pressure water flushing or ultrasonic cleaning can be used. Severely clogged inserts can be replaced with spare parts (designed as replaceable inserts).
Q5: Is conformal cooling suitable for all plastic materials?
A: Conformal cooling is suitable for most thermoplastics, including PC, ABS, PC+ABS, PA, PBT, LCP, etc. For crystalline materials (PA, POM, PPS), cooling rate affects crystallinity; simulation is needed to confirm impact of cooling rate on material properties and shrinkage, and cooling intensity should be adjusted accordingly. For thermosetting plastics, mold needs heating rather than cooling; conformal heating cooling systems are also applicable, with a similar principle.
In conclusion, molding cycle of thin-walled laptop casings has never been a matter of "slow cooling for thin-walled parts," but rather a reflection of design capabilities of cooling system. When traditional straight water channels are replaced by conformal cooling, when water channels follow product's curves and BOSS pillars, and when cooling rate at each location is uniform, 28-second cycle time can be compressed to 19 seconds or even less.
Value of conformal cooling goes beyond just shortening cycle time. It also brings more uniform shrinkage, less warpage, fewer shrinkage marks, and more stable appearance quality—a dual improvement in both cycle time and quality. It represents a shift in precision mold design from "experience-driven" to "data-driven"—position, diameter, flow rate of every water channel are determined by thermal analysis and fluid simulation, not by intuition of experienced craftsmen.