Plastic-transfer zones

Fig. 6 indicates how the adherend stresses drop to zero at one or other end of the bonded overlap and that, as a consequence of this, there are differential movements between the adherends, across the bond line, that result in adhesive shear stresses, and strains, that peak at the ends and are reduced throughout the elastic trough in the interior. If the load is high enough, the adhesive will go plastic in the load transfer zones at the ends. These zones are shown by... 

Strictly, this formula is slightly conservative. If one were to reduce the load transferred through the plastic end zones by the increment transferred through the elastic trough, which is easily shown to be (tp/A.), the design overlap would be reduced slightly to... 

In the context of aseptic processing systems, a barrier is a device that restricts contact between operators and the aseptic field enclosed within the barrier. Barriers may not be sterilized and do not always have transfer systems that allow the passage of materials into or out of the system without exposure to the surrounding environment. Barriers range from plastic curtains around the critical production zones to rigid enclosures found on modern aseptic-filling equipment. Barriers may also incorporate such elements as glove ports, half suits, and rapid-transfer ports. 

Prior to the start of any production activity, materials and components must be transferred from a warehouse environment into a classified environment. For most items this will necessitate removal from boxes or cartons, transfer to a nonwooden pallet, and passage through an air lock which serves as the transfer system between the controlled and uncontrolled environments. Often components are contained within plastic bags within a box or carton, and in some cases there are multiple bag layers to facilitate disinfection and passage through air locks into different zones of operation within the aseptic area. The firm may utilize an external disinfection of the materials in conjunction with this transfer. The concern is for minimization of particles and bioburden on these as yet unprocessed items in order to protect the controlled environment. 

Bockhom et al. [2, 3] proposed circulated-spheres reactor for the pyrolysis of waste plastics. This reactor enabled one to remove gaseous products from the reaction zone and to achieve high heat transfer rates, namely condition (2) described above. The concept of this circulated-spheres reactor has the possibility to attain conditions (1) and (3) by improving the reactor. 

---