(1) the change of mold temperature causes the instability of product size (the initial mold temperature is low, the size is stable, and the size will be unstable with the increase of mold temperature).<br>(2) the dimension is unstable due to long opening time.<br>(3) after demoulding, when the product is put into the water to cool down, the center distance of the middle block control hole, and the outer measuring plane shrinks and deforms when meeting water, resulting in the change of groove size.<br>
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