High superabsorbent content webs and method for making them
A superabsorbent, mesh technology, which is applied to meshes with high superabsorbent material content and its production field, can solve the problems of maximizing SAM content obstacles and SAM content selection restrictions, etc.
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example 1
[0055]Prepare a 3 inch diameter SAM / fiber mesh sheet for the device in Figure 1. Forming the web are cross-linked, partially neutralized sodium polyacrylate SAM particles ranging in diameter from 300 to 600 microns. In this example, FAVOR 880 particles from Stockhausen were used. The pellets were swollen with distilled water to 10 g / g before coating. In this example, the granules were swelled to 10 g / g by mixing the granules in the container with the required amount of water, usually by gently swirling the container containing the mixture by hand until all the water was absorbed by the granules. Immediately after the pellets had absorbed all the water, the swollen pellets were placed in an air agitated chamber with wood pulp fibers comprising 16% hardwood and 84% softwood based on dry fiber weight. In this example CR-1654 fiber from Alliance Forest Products was used.
[0056] In this example, the air agitation chamber is made of stainless steel and is 6 inches high and cyli...
example 2
[0066] Shakeout tests were performed on samples made in Example 1 with 60%, 70%, 80% and 90% dry weight of SAM and on samples made in Comparative Example 1 with 60%, 70%, 80% and 90% dry weight The samples of SAM are subjected to Shakeout test, and the results are shown in Table 1.
[0067] SAM content
[0068] *Note: Since Comparative Example 1 with 90% SAM content did not have sufficient structural integrity to hold its shape without the structural reinforcement provided by the screen, the mesh would crumble when attempting to move it.
example 3
[0074] The mesh was made using the procedure detailed in Example 1, except that the coated SAM was dried after coating and swelled before the mesh was formed. When no web was formed, the coating procedure described in Comparative Example 2 was used to coat the particles. The coated particles were then completely dried using the drying treatment of Example 1.
[0075] After the granules are completely dry, they are swollen with distilled water. The granules are swelled to 10 g / g by mixing the granules in the container with the required amount of water, usually by gently swirling the container containing the mixture until the granules have fully absorbed the water.
[0076] Immediately after the particles have absorbed all the water, the swollen coated particles are placed in the device shown in Figure 1, which now has an opening (100) reconnected to the air agitation chamber (10) and to draw the vacuum ) of the coating chamber (80). The process steps for web formation are th...
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