US 12,123,098 B2
Gas permeable metal with porosity gradient and method of manufacturing the same
Meng-Hsiu Tsai, Kaohsiung (TW); and Chun-Wei Chiu, Kaohsiung (TW)
Assigned to National Kaohsiung University of Science and Technology, Kaohsiung (TW)
Filed by NATIONAL KAOHSIUNG UNIVERSITY OF SCIENCE AND TECHNOLOGY, Kaohsiung (TW)
Filed on Dec. 7, 2022, as Appl. No. 18/062,704.
Claims priority of application No. 111141824 (TW), filed on Nov. 2, 2022.
Prior Publication US 2024/0141505 A1, May 2, 2024
Int. Cl. C23C 30/00 (2006.01)
CPC C23C 30/00 (2013.01) 4 Claims
OG exemplary drawing
 
1. A mold having a wall defining a mold cavity, the wall of the mold being formed from a gas permeable metal with a porosity gradient, comprising:
a first lamination layer having a first surface and a second surface arranged opposite to each other, and at least a second lamination layer connected to the first surface of the first lamination layer, wherein the first lamination layer and at least the second lamination layer are formed, by means of a laser scanning, with a plurality of first pores and a plurality of second pores, respectively, wherein the first pores of the first lamination layer are aligned with respective ones of the second pores of the second lamination layer and are communicated with each other, wherein a second diameter of each of the second pores is smaller than a first diameter of each of the first pores, and wherein the second lamination layer forms an internal surface of the mold wall, the mold cavity being disposed in a direct contact with the second lamination layer of the gas permeable metal, thus permitting fabrication of a plastic product in said mold cavity having a smooth surface corresponding to said second diameter of the second pores, and wherein said first lamination layer forms an external surface of said mold wall for an enhanced exhaust through the first pores of a gas generated during an injection molding of the plastic product in the mold cavity, thus eliminating an air trap caused by air caught within the mold cavity.