Selective Laser Sintering (SLS) was developed at the University of Texas in Austin, by Carl Deckard and colleagues. The technology was patented in 1989 and was originally sold by DTM Corporation. DTM was acquired by 3D Systems in 2001. The basic concept of SLS is similar to that of SLA. It uses a moving laser beam to trace and selectively sinter powdered polymer and/or metal composite materials into successive cross-sections of a three-dimensional part. As in all rapid prototyping processes, the parts are built upon a platform that adjusts in height equal to the thickness of the layer being built. Additional powder is deposited on top of each solidified layer and sintered. This powder is rolled onto the platform from a bin before building the layer. The powder is maintained at an elevated temperature so that it fuses easily upon exposure to the laser. Unlike SLA, special support structures are not required because the excess powder in each layer acts as a support to the part being built. With the metal composite material, the SLS process solidifies a polymer binder material around steel powder (100 micron diameter) one slice at a time, forming the part. The part is then placed in a furnace, at temperatures in excess of 900 °C, where the polymer binder is burned off and the part is infiltrated with bronze to improve its density. The burn-off and infiltration procedures typically take about one day, after which secondary machining and finishing is performed. Recent improvements in accuracy and resolution, and reduction in stair-stepping, have minimized the need for secondary machining and finishing.
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The Ministry of Industry of Indonesia has set an index to restructure 600 companies by investing 1.50 trillion dong (approximately US$170 million) each year between 2011 and 2014.
Another problem is the low competitiveness of the human resources in the textile industry, the unsatisfactory local infrastructure facilities, and the Indonesian National Standard (SNI) that protects Indonesian domestic industries against foreign imports.
Ade, chairman of the Indonesian Textile Industry Association (API). Sudrachart told reporters in Bandung that the current shortage of cotton supplies and unstable prices have affected the smooth development of the Indonesian textile industry.
Ader said that Indonesia's textile industrial cotton, in addition to imports from China and India, also imports from the United States, Brazil and Australia. 
It is understood that Indonesia's textile industry has the problems of backwardness in textile machinery, serious aging, low efficiency, and weak competitiveness, which directly affects the textile and garment industry in Indonesia.
November 04, 2023