Packing insert for disc-shaped objects
A described packing insert for disc-shaped objects has a ring and a deformable contacting portion supported by the ring and extending from a circumference of the ring. The contacting portion has one or more solid portions extending from the circumference. The solid portions define a plurality of radially arranged members separated by a plurality of void regions, where the solid portions extend radially from a circumference of the ring.
1. A container for semiconductor wafers, comprising:
a base;
an upwardly open hollow cylindrical structure supported on the base and defining a cavity with a generally planar bottom for receiving a given maximum number of stacked wafers circumferentially restrained therein;
a top cover removably attached to the base and over the cylindrical structure, the cover providing a generally planar top for the cavity;
a plurality of disk shaped objects having an outer diameter, wherein the outer diameter of the disk shaped objects is equal to or less than the inner diameter of the cavity; and
a single vertically deformable packing insert including:
a) an outer diameter and an inner diameter, the vertically deformable packing insert being dimensioned to provide support to dampen both a horizontal and a vertical motion of the given number of stacked wafers that generally matches a circumferential margin of a top surface of a wafer received in the cavity;
b) a circular portion having an outer diameter less than the inner diameter of the cavity, the circular portion being dimensioned to provide support and dampen both the horizontal and the vertical motion of the given number of stacked wafers through contact with an outer circumference of the given number of stacked wafers;
c) a plurality of deformable cantilever portions respectively extending vertically and radially inwardly at circumferentially spaced positions at the circular portion, wherein the cantilever portions are only coupled to one another at the circular portion, and an end of each deformable cantilever portion contacts the underside of the top cover; wherein
the circular portion and the cantilever portions being dimensioned and configured so that the vertically deformable packing insert will elastically compress or expand in a vertical direction to at least vertically restrain the stacked wafers within the cavity, contacting only a top disk shaped object of the plurality of disk shaped objects, wherein
the top disk shaped object is itself in contact with topmost wafer of the stacked wafers therein, and a bottom disk shaped object in contact with a bottom wafer, the bottom disk shaped object also in contact with the base.
2. The container of claim 1 , wherein the circular portion and cantilever portions are formed as a single integral packing insert unit.
3. The container of claim 2 , wherein the integral packing insert unit comprises a polymer material.
4. The container of claim 1 , wherein the single vertically deformable packing insert includes circumferentially spaced voids between the cantilever portions.
5. The container of claim 1 , wherein a disk shaped object of the plurality of disk shaped objects is furthermore inserted between each wafer of the wafer stack.