Side Cores

Side cores rotate inwards to complete forming... 

Typically, a binary system was selected as the base component of the recipe and the addition of polyelectrolytes to either side (core or receiving bath) was tested to evaluate the change in the capsule properties. The 33 successful multicomponent membrane systems are presented in Table 1. The components of the core material side (21 different chemical compositions) are listed in the first column, while the receiving bath components (20 different chemical compositions) are listed in the second column. With the exception of xanthan and CMC, the first polymer listed on the core side are gelling polymers which form beads with the appropriate ionotropic cation (salt). CMC can also be gelled by ions (alum), although they are considered to be non-compatible for cellular applications. The cations were tested both sequentially, usually with ionotropic cation first, and simultaneously. Walled capsules with adequate mechanical properties were often obtained through the simultaneous application of two polycations. Such a... 

Side Cores For openings created using side cores, the wall can be vertical (as shown in Fig. 4.25) or at some (small or considerable) angle to the vertical. Any size and shape opening can be produced. 

The resulting opening can have sharp, chamfered, or rounded edges on the outside of the wall (Fig. 4.25 A-C). The inside, where the side core meets the main core, will always be sharp. This method is frequently used and is based on either cam-actuated or hydraulically operated slides which move the side core in and out of molding position. This motion can be at right angles to the center of the vertical axis of the product, or at any (reasonable) required angle, in which case the mold cost would increase even more. 

Figure 4.25 Opening shapes created by side cores A. sharp edges, B. chamfered edges, and C. rounded edges...

Moving Side Waiis A moving side wall is a section of the cavity which fonns the side (or a portion of the side) of the product. The Section either moves straight sideways, similar to a side core, or it slides up (together with the withdrawing core and the product) and outward at the same time. This compound motion (up and out) frees the side wall from any projections that are formed by that section of the cavity and from any cores that have openings. 

Holes in a Vertical Side Wall Figure 4.29 shows a very simplified view of a box with a hole in the end wall. The hole is produced by a side core, and some mechanism is thus required to pull the side core out of the wall of the box before the box can pull out of the cavity. This causes a slight increase in the mold opening time. 

In Fig. 4.30, the box has been redesigned. To eliminate the side core, the shape of the wall has been modified with a vertical groove to permit an insert to shut off against a matching wall of the core. 

Figure 4.29 Mold schematic (left) shows the side core passing through the cavity to produce (right) a hole in the end wall of a box...

Fi e 4.50 Two cross sections of a pail rim A. projection is within the stripper rinj ai B. projection is formed by side cores (Note that mold features such as cooling, ventmg, etc., are not shown)... 

In Fig. 4.50B, the product does not allow a taper in the stripper as shown in Fig. 4.50A the wall ends at the P/L at a location different from example A. The projection in B is now in the location where the wall was in A, and must be Planned by side cores. This is a considerably more complicated and expensive ilethod of building a mold. 

A.9.1 Outside Threads Outside threads are outside projections, and will idways need at least two side cores to free the molded piece. In some cases, the mold designer may want to use more than two side cores (three or four) to reduce the stroke of the side cores. In the thread section of the product, ther are always t many witness lines visible as there are side cores. 

Mote thatdaeere wilLlieawi iess line where the ififii meetstheverdCid wall. Howm, there would also be witness lines if the hmi were produced with a side core or with a split ia ty. 

Bicomponent fibers or heterofil fibers are filaments made up of different polymers. There are many geometrical arrangements. The three main heterofil geometries are side-by-side, core-sheath (both concentric and eccentric), and the multiple core or islands in a sea configuration. The so-called splittable pie configurations are used in the production of microfibers (see Figure 1.12). 

Side actions (side coring or side draw pins)... 

At Trawsfynydd, the dose dependencies of AT 40j and ACy were greater for samples from below-core (duct 1) compared with side-core locations (duct 2) at similar irradiation temperatures (Fig. 7.4). ... 

For fully automatic cycles, molds for such a part may be constructed with cam-actuated or hydraulically actuated side cores which serve the same purpose as the previously described mandrel. In each cycle, after the mold is closed and prior to injection of material, the side core is automatically actuated into place. Following the cycle, the side core is retracted automatically prior to mold opening and part ejection (Fig. 6.26). 

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