In PVC (polyvinyl chloride) production, reducing the amount of stabilizers can have various effects. Stabilizers play a crucial role in PVC production, as they are used to prevent PVC from decomposing and degrading during processing and use. Reducing the amount of stabilizers may lead to the following phenomena:

1. **Decreased thermal stability**:
   - PVC is prone to decomposition and release of hydrogen chloride gas when heated. Reducing stabilizers can make PVC more prone to decomposition during processing, affecting the quality and performance of the product.

2. **Color change**:
   - Reduction of stabilizers may cause PVC to undergo oxidation and degradation during processing, resulting in a yellowing or darkening of color.

3. **Decreased mechanical properties**:
   - PVC may become brittle in the absence of sufficient stabilizers, affecting its impact resistance, tensile strength, and elongation.

4. **Increased processing difficulty**:
   - Reduction of stabilizers can make PVC more prone to degradation during processing, leading to the formation of bubbles, black spots, or other defects, increasing processing difficulty and scrap rate.

5. **Shortened lifespan**:
   - Reduction of stabilizers may make the final product more susceptible to heat, light, and oxygen during use, accelerating aging and shortening the lifespan.

6. **Increased odor and smoke**:
   - During processing, the increase in hydrogen chloride and other by-products from degradation can lead to an increase in odor and smoke in the workshop, affecting the working environment and worker health.

In conclusion, stabilizers play a key role in PVC production, and reducing their amount can have negative effects on the thermal stability, mechanical properties, appearance quality, and processing performance of the product. Therefore, when adjusting stabilizer levels, it is necessary to consider these potential issues and conduct necessary testing and adjustments to ensure product quality and production stability.