Archive image from page 70 of Development of a spherical acrylic. Development of a spherical acrylic plastic pressure hull for hydrospace application . developmentofsph00stac Year: 1970 Figure 40. Typical sample of a properly solvent-bonded joint on a 15-inch-diameter capsule model. Although the procedure developed for solvent bonding model capsules produced satisfactory joints, grave doubts existed whether this technique would produce satisfactory results for the large-scale capsule. It appeared that in order to solvent bond the large pentagons, the dimensional control of individual pen- tag
Archive image from page 70 of Development of a spherical acrylic. Development of a spherical acrylic plastic pressure hull for hydrospace application . developmentofsph00stac Year: 1970 Figure 40. Typical sample of a properly solvent-bonded joint on a 15-inch-diameter capsule model. Although the procedure developed for solvent bonding model capsules produced satisfactory joints, grave doubts existed whether this technique would produce satisfactory results for the large-scale capsule. It appeared that in order to solvent bond the large pentagons, the dimensional control of individual pen- tagons would have to be so strict as to make the fabrication cost unacceptable. Also, the cost of a clamping system for placing the solvent-bonded joints in a large sphere under uniform compression would, in all probability, be higher than the cost of fabrication up to the bonding stage. In view of these problems, it was decided to find a different joint bonding technique that, although being as costly as the solvent bonding technique for the models, would be distinctly less for the large-scale capsule. The alternate bonding technique investigated was the cast-in-place adhesive. The prime characteristics of this bonding technique are: (1) the pieces to be bonded are maintained in a fixed relationship to each other by spacers that do not permit the pieces to contact each other, (2) the space between the acrylic plastic members is made fluid tight by placement of adhesive tapes over both sides of the space, (3) the adhesive is poured into the taped-over space by means of a funnel or squeeze bottle, and (4) filling the joint space is done in more than one pour, with the mechanical spacer being removed from the joint after the first increment of adhesive-filled joint has set, but before the succeeding increment of adhesive covers it (Figure 42). 67
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