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The Difference Between in Mold Injection Molding and Traditional Injection Molding

The core difference between the two processes lies in the fundamental opposition between "functional integration timing" and "manufacturing logic architecture". In mold injection molding melts the decorative and functional layers at the moment of molding, while traditional injection molding relies on post-processing to repair defects. This branching path leads to a systemic gap in efficiency, performance, and cost.

-In mold injection molding completes film bonding, circuit embedding, and texture transfer simultaneously during the golden window period of polymer solidification (0.5-3 seconds). For example, in automotive touch panels, the capacitor layer is directly encapsulated during melt filling to eliminate the risk of interface aging after bonding.

-Traditional injection molding first forms the basic plastic parts, and then goes through 3-5 processes such as spraying, electroplating, and bonding. The phone case needs to be circulated for 48 hours and undergo 4 baking cycles, which not only increases the risk of dust pollution, but also leads to the accumulation of internal stress in the material.

Fundamental difference: The in mold process is time compression, while the traditional process is a defect repair chain.

1, Performance Fault: The Competition between Molecular Locks and Physical Stickiness

In mold injection molding uses melt hot pressing infiltration (150 ℃/80MPa) to form molecular chain entanglement between PC film and ABS substrate at the micro level, with a bonding strength of 38MPa. The medical catheter connector thus achieves zero bacterial permeability sealing.

The spray coating of traditional injection molding is only physically attached, with a bonding force of less than 8MPa. The spray coating of the electric tool handle will bubble and peel off after 500 grips due to sweat corrosion.

Performance gap: In mold processes create molecular level fusion interfaces, while traditional processes are limited to weakly bonded coatings.

2,Cost Restructuring: The Game between Short term Investment and Long term Losses

In mold injection requires the use of precision positioning molds (40% higher cost), but eliminates the need for later equipment such as painting lines and electroplating tanks. When producing 500000 smart panels annually, the overall cost is reduced by 25%.

Traditional injection molding requires less initial equipment investment, but consumes 12 grams of coating and 0.8 kWh of baking energy per piece. According to calculations by home appliance companies, the proportion of processing costs will soar to 34% of total costs three years later.

Economic logic: In mold craftsmanship is a strategic investment that prioritizes bitterness over sweetness, while traditional craftsmanship is a consumption war of boiling frogs in warm water.

3,Technological Frontier: Dialectical Analysis of Freedom and Chains

The boundary breaking quantum dot positioning technology for in mold injection molding achieves a registration accuracy of ± 5 μ m, allowing 0.12mm wide electroplating lines to be accurately embedded in 3D curved surfaces. The logo of the new energy vehicle breaks through the 16 fold metallic texture presentation.

The traditional injection molded shackles cannot handle the concave structure after post-processing, and there is always a 0.3mm coating gap at the corner of the motion camera housing, which becomes the starting point of corrosion penetration.

Design philosophy: In mold craftsmanship unlocks topological freedom, while traditional craftsmanship is trapped in geometric forbidden zones.

The cost of small-scale in mold injection molding has approached that of large-scale traditional production. Future prophecy: The boundary between the two will eventually collapse into the collaborative evolution of "intelligent molds" and "universal substrates". When traditional injection molding machines obtain real-time film tension data through IoT modules, and when the cost of nanoimprint films injected in the mold drops to the level of ordinary PET, the choice will no longer be an either or confrontation, but a polymorphic expression of manufacturing intelligence.