Method for making vessels for improving the mechanical strength thereof
A container and blank technology, which is applied in the field of polymer blank manufacturing containers, can solve the problems of cycle time contradiction, increased production cost, long cycle time, etc.
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example 1
[0149] where H ref is the enthalpy of fusion assuming a fully crystalline sample. Choose 140J.g here -1 , which corresponds to the most commonly used values in plastics laboratories. example 1( Figures 3A-3F , 4A and 4B)
[0150] In this example, the mold 5 was heated so that the temperature on its inner wall side was about 160°C. The material of the preform 3 is PET. The reaction gas is hydrogen (H 2 ). The gaseous mixture of air / hydrogen is carried out in a ratio of between 4% and 18% by volume of hydrogen, preferably 6%.
[0151] After the hot preform 3 has entered the mold 5, the method consists of a first operation, called pre-blowing, which consists in stretching the pre-form 3 by sliding the rod 12 while pre-blowing, opening the electric valve EV1 and EV2, a mixture of air and reaction gas at a pressure between about 5 and 20 bar is introduced into the preform 3 ( Figures 3A-3C , Figure 4B 1, 2 lines). The duration of this first operation is a predeterm...
example 2
[0162] During hot filling, most of the residual stress accumulated during the formation of the container 2 is released in the amorphous material with a large proportion on the side of the inner wall 42, so the inner wall 42 acts as a buffer for the highly crystalline material part, preventing deformation from propagating in the container. Example 2 ( Figures 5A-5H , 6A, 6B)
[0163] In this example, the mold 5 was heated so that the temperature on its inner wall side was about 160°C. The material of the preform 3 is PET. The reaction gas is hydrogen (H 2 ). The gaseous mixture of air / hydrogen is carried out in a ratio of between 4% and 18% by volume of hydrogen, preferably 6%.
[0164] After the hot preform 3 enters the mold 5, the first pre-blowing operation consists in stretching the pre-form 3 by the sliding of the rod 12, and at the same time performing the pre-blowing, opening the electric valves EV1 and EV2 so that the pressure is about A mixture of air and reacti...
example 3
[0178] During hot filling, most of the residual stress accumulated during the formation of the container 2 is released in the amorphous material with a large proportion on the side of the inner wall 42, so the inner wall 42 acts as a buffer for the highly crystalline material part, preventing deformation from propagating in the container. Example 3 ( Figures 7A-7L , 8A, 8B)
[0179] In this example, the mold 5 was heated so that the temperature on its inner wall side was about 130°C. The material of the preform 3 is PET. The reaction gas is hydrogen (H 2 ). The gaseous mixture of air / hydrogen is carried out in a ratio of between 4% and 18% by volume of hydrogen, preferably 6%.
[0180] After the hot preform 3 enters the mold 5, the first operation is pre-blowing, which is to stretch the pre-form 3 through the sliding of the rod 12, and at the same time pre-blowing, open the electric valve EV1 and EV2, so that the pressure is about A mixture of air and reaction gas betwe...
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