Shuttle mold

Conventional extmsion or coextrusion may be performed on vertical or horizontal rotary or shuttle mold configurations. In shuttie blow mol ding the extmder and die are in fixed horizontal and vertical position two or more molds shuttie into and out of position beneath the die. By reciprocating in two planes, the mold may remove a parison and permit the extmder to function continuously. 

There are presses that include shuttle (molds in which usually two, or more, are moved so that one mold is positioned to receive material and then moves to the press permitting another mold to receive material with this cycle repeating result is to permit insert molding, reduce molding cycle, etc.), rotary or carousal system, and book opening or tilting press.4 279... 

The materials were extmded and the molten parison was captured in a shuttle mold. The parison was blown with dry filtered air at 0.27-0.55 MPa at a mold temperature of 15°C-38°C. After molding, the container was allowed to cool in ambient air for 20 to 60 seconds. It was removed from the mold and had an average weight of 186 g. Thickness of the layers was 0.12-0.30 mm for the inner layer, 0.37-1 mm for outer layer, and 0.12-0.25 mm for the tie layer. 

Another approach to increase production is to use one parison extra long to cover two or more cavities located vertically in the mold. In fact, one parison can extend the multiparison with two or more vertical cavities. AH that is required is a machine with the capacity to handle the output from the extruder to the clamping capability. See blow molding, extruder horizontal rotary-wheel blow molding, extruder vertical rotary-wheel clamping platen, rotary clamping platen, shuttle mold cavity. 

Another striking limitation is that parts must be trimmed from blanks after forming. This can create a process cost scenario that is prohibitive when the cost of higher-value sheet stock is combined with equipment, shuttle mold sys-... 

This method is slow because of the multiple operations on a shuttle machine. The heat of extmsion sterilizes the bottle, which is not readily achieved after molding. Blow-mold/fill/seal systems are used commercially for beverages and for pharmaceutical packaging. 

Figure 25 Schematic diagram of an injection/transfer molding machine [9]. (a) Hydraulic separation unit for upper mold plate, (b) Hydraulic separation unit for middle mold plate, (c) Shuttle system with automatic sprue nipple removal, (d) Brushing unit for cleaning middle mold plate, (e) Hydraulic ejector for automatic ejection.

Over-molding Over-molding is also called in-mold assembly, two-color rotary, or two-color shuttle. Two materials are molded so that the first molded shot is over-molded by the second molded shot first molded part is positioned so the second material can be molded around, over, sections, or through it. The two materials can be the same or different and they can be molded to bond together or not bond together. If materials... 

We can generally extrude a parison much faster than we can inflate, cool, and eject the product. When this is the case, we employ more than one mold. If we are using two molds, they shuttle back and forth alternately between their individual blowing stations and the parison capture... 

Two or more molds can be used in a shuttle arrangement, so that one or one set is open for parison extrusion while the others are performing the blowing and cooling cycle. There is also a method of mold rotary movement that results in very high production rates. In such machines,... 

In addition to the 3-station IBM machines there are those that have more stations with the usual being a 4-station machine. The extra station(s) can provide extra heat/cooling cycles, tighter dimensions, inmold labeling, etc. Conventional IMMs with applicable molds have been used to BM containers (Chapter 4). After the machine prepares the preforms on the cores, the mold opens and is shuttled (upward,... 

This type of extrusion blow molding machine uses something called a shuttle machine to get all the parts in place. Alternatively, a rotary machine, illustrated in Figure 14-61, can be used. Rotary extrusion blow molders are used in high volume applications, as in the production of laundry detergent bottles. 

The two molds needed for this process, an injection mold and a blow mold, may be located in the same molding machine or in different molding machines. In the first case, known as a one-stage process, there are multiple stations in the machine through which the material travels. For example, in a four-station machine the polymer would be injected into the preform, shuttled to a conditioning (profiled heating) station, shuttled to a blow station, and then shuttled to ejection. 

The third and most successful approach was accomplished on a wheel-type blow molding machine. Unlike the shuttle machine where only gravity acts on a downward extruded parison, a wheel machine draws or pulls the parison from the die. This allows extension in the extrusion direction and the opportunity to thin down the barrier layer and reorient the mica platelets. 

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