This paper is devoted to investigating: 1) the distribution of the residual wall thickness in gas-assisted molded tubes with contractional and expansional transitions; 2) the mechanism of this distribution of the wall thickness; 3) the effects of adding fillets to transitions on improvement of the uniformity of the residual wall thickness; and 4) the distribution of the residual wall thickness in curved sections and its relation to processing conditions.
* Residual Wall Thickness at Expansional Transitions
Expansional Transitions Filled With Melt Before Gas Injection
The residual wall distribution at expansional transitions depends on whether that specific transition section is filled with melt at the instant of gas injection.
Expansional Transitions Not Filled With Melt Before Gas Injection
Figure 5 shows the residual wall thickness at expansional transitions that were not filled with melt until gas-assisted filling occurred.
After gas is injected in, the gas drives melt through the empty expansional transition to fill the tube cavity.
Figure 8 shows the residual wall thickness at expansional transitions with 45[degrees] fillets filled with melt before gas injection.
Jonathan Holden calls you a "deep imagist," and Lawrence Lieberman calls you an "expansional
" poet, working in confrontation with "the mystique of oneself." Donald Hall identifies your language as quiet, colloquial, and profoundly subjective and that it--together with the work of your contemporaries--signaled the end of the era of T.S.