Multilayer stretch blow molded container and multilayer preform
A technology of stretch blow molding and pre-products, which is applied in the direction of containers, rigid containers, layered products, etc., can solve the problems of damaging the excellent transparency of polyester resins, achieve excellent mechanical strength, and prevent interlayer peeling effects
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Embodiment 1
[0166]By using a co-injection molding machine, a multilayer preform of two kinds of three-layer constitution (PET / middle layer / PET) was molded. Dried PET1 was put into the hopper of the injection molding machine for forming the inner and outer PET layers, and dried APET1 and PA1 blended at a weight ratio of 70:30 were put into the hopper of the injection molding machine for forming the intermediate layer, and These materials were co-injection molded. While the intermediate layer was formed at a temperature of 260°C, the inner and outer PET layers were set at a temperature of 290°C. The weight of the preform was 24 g and the proportion of the intermediate layer was 6% by weight of the whole bottle. The preform is shaped such that the intermediate layer does not reach the mouth / neck nor the bottom.
[0167] Next, the multi-layer preform is biaxially stretched and blow-molded into a multi-layer bottle by the above-mentioned method. With regard to the obtained preform and bottl...
Embodiment 2
[0170] Except that the dry blend of APET1, PET1 and PA1 with a weight ratio of 52.5:17.5:30 was put into the hopper of the injection molding machine for forming the intermediate layer, and the intermediate layer was molded at a temperature of 280° C., the same method as in Example 1 Preforms and bottles were prepared and measured in the same manner.
[0171] In addition, a biaxially stretched sheet was prepared and measured in the same manner as in Example 1, except that a dry blend of APET1 and PET1 in a weight ratio of 3:1 was supplied to the hopper of the injection molding machine.
Embodiment 3
[0173] Except that the dry blend of APET1, PET1 and PA1 with a weight ratio of 35:35:30 was put into the hopper of the injection molding machine for forming the intermediate layer, and the intermediate layer was molded at a temperature of 280° C., in the same manner as in Example 1 Prepare and measure preforms and bottles in the same manner.
[0174] In addition, a biaxially stretched sheet was prepared and measured in the same manner as in Example 1 except that a dry blend of APET1 and PET1 in a weight ratio of 1:1 was supplied to the hopper of the injection molding machine.
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Abstract
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