| 摘要 |
<p>1,119,077. Determining homogeneity. GENERAL ELECTRIC CO. Nov.29, 1965 [Dec. 7, 1964], No. 50621/65. Heading G1S. [Also in Division G2] In the manufacture of plastics it is found that if the liquid reactants are not efficiently mixed, and the resulting product is consequently not suitable for certain applications, striations are visible when the material is exposed in an unstressed state to polarized light. Such inspection may be performed on the finished product (32), Fig. 3 (not shown) by placing a light source (36) and polarizer (33) behind it and an analyser (34) in front of it. Alternatively as shown, Fig. 4, liquid resin passing through pipe 44 and valve 42 and liquid hardener through pipe 46 and valve 43 are fed to a chamber 47 with mixer 48 from whence they pass through a detection chamber 51 having a lamp 54, polarizer 56, and window 52, on one side and a window 53 and analyzer 57 on the other side. If the desired product is not birefringent, apparatus as in Fig. 4 may be used, with reactants such as polyurethane resin and hardener to match the viscosities and relative quantities of the desired liquid components and valves 42, 43, adjusted until it is seen that efficient mixing is produced. Then the desired liquid components are substituted.</p> |
