PET preform molds typically employ multi-cavity designs, ranging from 24 to 96 cavities or even more. Under multi-cavity production conditions, the consistency of product weight, wall thickness, and bottle neck size directly affects the stability of downstream blow molding processes and the yield rate of finished products. One of the key factors affecting multi-cavity consistency is the parallelism of the mold platen and the uniformity of the clamping force distribution in the injection molding machine's clamping mechanism. If the mold platen deforms significantly during injection, uneven stress on the mold cavities will result in differences in the filling and holding pressure effects of the products in each cavity.

      The Lisong PET-specific injection molding system employs a direct-pressure clamping structure, designed to improve the mold platen deformation problem. During mold closing, the deformation pattern of the mold platen is more controllable, and the parallelism of the mold platen can be adjusted to a certain extent to follow the actual contact surface of the mold. This "parallelism following" characteristic is of practical significance for multi-cavity precision molds: even if the mold itself has minor thickness deviations or installation errors, the equipment can achieve a more uniform fit between the mold platen and the mold through the self-adaptive capability of the direct-pressure structure, reducing product differences caused by localized stress concentration.

      From a production stability perspective, minimal mold deformation directly benefits product consistency across all cavities. In PET preform production, weight fluctuations often lead to uneven preform wall thickness, affecting the strength or appearance of the blow-molded bottle and potentially causing it to burst. If the mold platen balance remains good after mold clamping, the gate and cavity dimensions of each cavity can stably reproduce the design values. This makes it easier for process engineers to find suitable injection parameters during adjustments, and the scrap rate is easier to control during production. For molds with a high number of cavities, this consistency advantage is further amplified. Furthermore, direct-pressure mold clamping structures are typically paired with low-friction linear guides. The precision retention of the guides affects the smoothness of mold platen movement and repeatability. During high-speed mold opening and closing, if the guide rail friction resistance is high, the mold platen movement may exhibit slight wobbling, which, over time, affects mold positioning accuracy. Using low-friction linear guides helps reduce wear on moving parts and maintains the stability of mold closing action.

      The PET-specific twin-screw structure ensures fast and precise injection, while low-speed material storage and high plasticization effectively control the AA value. AA value control is a highly technical topic, but it's also a practical issue of great concern to preform manufacturers. Many customers, when purchasing equipment, inquire about whether it meets cola standards and whether the AA value is stable. The PET-specific twin-screw injection molding machine, with its low-speed, high-plasticization, injection-pressure, and simultaneous material storage design, provides preform manufacturers with a feasible path to control AA value and shorten cycle times. For customers focused on preform flavor indicators and production efficiency, this structure is worth exploring in depth.