Pre-blow air must be set up to be part of main blow air or separate when pre-blow is in a different part location from main air blow. This should be connected to the main air-blow lines to allow for rapid transfer between the two. Some parts will require “low blow” or low-pressure blowing air. The exhaust valve must be located right at the discharge of the blowing needle or pin. Large lines will facilitate quick exhaust of air within the part during the vent cycle. The air lines and the valve and manifold should be as large as feasible-at least 1 in. It is best to locate the main air valves as close to the inlet of the parison as possible to ensure that the parison inflates quickly. If a screw changeover is necessary, remember to provide the space to accomplish this. However, if you plan on also running engineering resins, you might need another screw. Maybe you can use a general-purpose screw if you’re running only polyolefins (though a g-p screw is not a perfect solution, by the way). What material do you plan to run in this equipment? This should be reviewed before the machine is built. You must be set up properly to achieve this switchover. Remember that the head tooling is heavy and very hot. If the press is rolled out of the way, head tooling can be changed at the same time as the mold is replaced. Like mold-change procedures, you must determine the best way to change head tooling. When you change molds, you will likely also need to replace the head tooling. Use of quick-connect fittings and manifolds for air, water, and hydraulic connections will drastically shorten changeover times. Mold mounting can usually be accomplished in an hour. Locating slots, pins, or bars may also be used for mounting molds in relation to the head centerline. The two most common means are bolt holes or T-slots. You should also determine when you order the equipment how you’ll be attaching molds to the platens. This may require moving work tables and conveyors. Whatever your choice, adequate space must be provided. When considering machine layout, identify how you’ll be mounting your molds-by forklift truck, overhead crane with a roll-out clamp, etc. These stairs must be built to OSHA and ANSI specifications for safety. It is important to locate these stairs for safe access, but away from production functions. Stairs are provided for access to the upper level of the equipment. You’ll also need room for auxiliary equipment. This is the position on the machine where the blow molded parts will be removed.Īccount for space to finish the parts by removing flash (trim) and doing any drilling or cutting required. Once you have determined where the machine will be located on the floor, you can specify the operator position. It may require a crane, large forklift truck, or a combination of the two. You must have the proper equipment to handle each part. In addition, find out the weight of each of the machine’s sub-components. Where is power hookup on the machine? Is there enough power in the plant for new equipment? Electricity: Consider the voltage, breaker size (full-load amps), and location of the main breaker.
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