Sealing technology manual for the process industry

Jam In the manufacture of jams and pre- serves, pieces of fruit and crystalliza- tion of sugar lead to increased wear. Fruit particles can be pressed into the seal and cause leakage in extreme cases. The sealing material used here must be resistant to the fat- and flavor- containing additives and to the partly aggressive cleaning agents. Convenience foods Different cleaning media for closed and open processes greatly stress seals in the production of ready-made meals, such as frozen pizza. The production of powders, pastes, liquids etc. requires individual demands on the sealing materials. For some convenience foods, excellent low-temperature flexibility is also required, which cannot be met by every seal material in combination with the chemical resistance. Chocolate Chocolate production and processing is a particular challenge for seals. The ingredients themselves are challen- ging because it is a medium contain- ing fat, which may also contain addi- tives such as nuts, raisins or crisps, causing severe abrasion. This is further increased when crystallization of the sugar occurs during the manufactur- ing process. Additives containing fla- voring agents are also an exclusion cri- terion for some materials. Then the temperatures must be taken into ac- count, some of which are very high in chocolate production in order to make the ingredients capable of being pro- cessed. The sealing material must meet all of these requirements. Ice cream The threat to the sealing material in the manufacture of ice cream consists, firstly, of the high fat content of the ice cream mixture, and secondly, of addi- tives such as pieces of fruit which may press themselves into the seal and cause leakage. Large temperature ranges, e.g. from 0 °C (+32 °F) during the transportation of a cold product up to +140 °C (+284 °F) during steam ster- ilization, must be mastered reliably by the seal. Aside from that, resistance to CIP/SIP media should also be given. APPENDIX PRODUCT PORTFOLIO MATERIALS RESISTANCE & PURITY ENGINEERING PLASTICS ELASTOMERIC MATERIALS TECHNICAL FUNDAMENTALS INTRODUCTION 15

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