Coupled with a finite element simulation managed on the bottle, these results allow the identification of the induced mechanical properties. Back to room temperature, induced mechanical properties are determined by two methods: (i) specimens are cut out from the bottle and prepared to be tested on uniaxial tension machine (ii) bottles are blown under different pressures to follow the strain field using digital image correlation.
For an identical final volume of the blown preform, the influence of initial temperature on self-heating is discussed. The increase of temperature is determined comparing initial temperature in zone 1-2 with final temperature in zone 3-4. In order to evaluate this self-heating value, preforms have been blown with at different initial temperature followed using a thermal camera. The necessity to take into account the self heating phenomena, that may have impact on induced properties, appears to be crucial for thermoforming process simulation and in particular for ISBM of PET. The great influence of temperature on polymer’s behavior is well known and a 10☌ increase can lead to a 10 time reduction of the viscosity for example. The deformation characteristics of PLLA tubes in SBM was quantified by analysis of shape evolution, strain history and stress-strain relationship. Real-time images of the tube during forming were captured using high speed cameras and the surface strain of the patterned tube was extracted using digital image correlation (DIC).
The onset of pressure activation relative to the axial stretch was controlled deliberately to produce a simultaneous (SIM) or sequential (SEQ) mode of deformation. PLLA tubes were heated, stretched and blown with no mould present inside a temperature-controlled water bath whilst recording the processing parameters (axial force, inflation pressure).
#Preform bottle free#
To better understand this processing technique, a novel experimental setup by free stretch blow inside a water bath was developed to visualise the tube forming process and analyse the deformation behaviour. With lighter preforms and shorter necks, we can help you save costs while maintaining bottle performance and ensuring a strong consumer experience.Processing tubes from poly (l-lactic acid) (PLLA) by stretch blow moulding (SBM) is used in the manufacture of bioresorbable vascular scaffolds (BVS) to improve their mechanical performance. Sidel has redesigned the standard preform with a 26/22 neck finish in order to cut an extra 15% off the weight. Preforms: Cut an extra 15% off the weight Meanwhile, you will appreciate the environmental and cost-saving benefits it delivers. Consumers like the convenience, re-sealability and recyclability of PET. It can also be moulded into single-serve, multi-serve or extended-family formats. PET offers great freedom of shape, which can help create a standout brand. Prototypes - 3D printed physical models.Technical design - all parts of the bottle and preform.Conceptual design - bottle drafts and digital mock-ups.A bottle that is ergonomic, durable and unique. And based on your insights, specifications, supply chain conditions and product goals, we can help you design a package in line with your brand. Consumers look for interesting bottle shapes and format sizes that fit their lifestyles.
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