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1. What are the types of metamorphism?
1. Thermal contact metamorphism is a type of metamorphism caused by the release of heat from magma bodies, resulting in changes in the surrounding rock of the contact zone. In this process, the original rock mainly undergoes recrystallization and metamorphic reactions (metamorphic crystallization), which may form new mineral phases, but there is basically no significant change in chemical composition.
2. Dynamo metamorphism is a rock metamorphic process that occurs under the stress generated by tectonic movements. In this process, the temperature is usually not very high, and the recrystallization or metamorphic crystallization is not very strong. The distribution of this metamorphic process is usually related to fault zones, so it often presents a banded distribution. 3. Pneumatic hydrothermal metamorphism refers to the process in which chemically active gaseous or liquid fluids displace rocks, causing them to undergo metamorphism. When this fluid comes from a magma body, it can cause metasomatism between the surrounding rock and the rock mass in the contact zone, known as contact metasomatic metamorphism. Regional metamorphism is a metamorphic process of metamorphic rocks that are widely distributed due to complex factors such as regional heat flow anomalies, pressure effects, and sometimes the addition of fluid phases. It can be further divided into: regional burial metamorphic, regional thermal flow metamorphic, regional dynamic thermal flow metamorphic, and regional high temperature metamorphic.
5. Migmatization is a metamorphic process in which the internal heat flow of the crust continues to increase on the basis of regional metamorphic, resulting in th

Metamorphism refers to the superposition of metamorphic processes that rocks have undergone at different stages. Retrograde metamorphism refers to the replacement of originally higher temperature metamorphic mineral assemblages in rocks with lower temperature mineral assemblages, while progressive metamorphism is the opposite. Ocean floor metamorphism refers to the recrystallization, metasomatism, and hydration of basic and ultrabasic volcanic products in the mid ocean ridge under high heat flow, forming sodium rich and water rich intermediate to low-grade metamorphic mineral assemblages.
2. Introduction to MeltFlipper Channel Flip Technology in Scientific Injection Molding
MeltFlipper Channel Flip Technology (Branching Runner Thermal and Flow Balancing) is a patented technology of Beaumont Corporation in the United States, aimed at solving the quality difference problem caused by unbalanced filling of multi-mode cavity molds. By flipping the melt flow path, the symmetrical distribution of material properties (pressure, temperature, viscosity) is achieved, which improves production yield and mold utilization.
.1. Technical Background and Causes of Problems Flow Imbalance Phenomenon In geometrically symmetric multi-mode cavity molds, plastic melt generates asymmetric flow due to shear effect.
. High temperature melting glue preferentially fills the inner mold cavity along the inner side of the channel, resulting in inconsistent filling speed, pressure, and temperature of each mold cavity (Figure1, Figure 2). Misconception: It was once attributed

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