Abstract
Abstract In this investigation, softwood pulp and bleached wheat straw pulp were used as raw materials, and Calcium Sulfate Whiskers (CSW) were used as fillers. Based on the structural properties and characteristics of CSW, the printing properties of the paper with CSW, such as whiteness, opacity, pH value, uniformity, Z-direction tensile strength and surface strength, were analyzed. The results showed that CSW has low solubility, high retention and fiber-like appearance. The whiteness of the paper is the best when the filling amount of CSW is 20 %. The paper opacity of softwood pulp increases significantly, and the opacity of bleached wheat straw pulp decreases significantly when CSW is more than 30 %. The addition reduces pH and surface strength of the paper. The evenness of the paper does not change obviously. The Z-direction tensile strength of the paper decreases in the softwood paper, but increases obviously in the bleached wheat straw paper.
Highlights
The contribution of papermaking filling is to reduce production costs and obtain certain properties of the paper, such as filling the gaps in the paper (The filling methods are shown in Fig. 1), improving the evenness of the paper, increasing the whiteness and opacity of the paper, improving the printability and increasing the dimensional stability of the paper, and etc (Zhu et al 2005)
Referring to the main technical standard of gypsum fiber formulated by China University of Mining and Technology (Yin et al 2008), the Calcium Sulfate Whiskers (CSW) used here should be calcium sulfate medium long whisker, which provides more opportunities for contacting and cross-linking with plant fibers
It can be concluded from the form factor and kink index of CSW that, CSW is an inorganic mineral fiber, not straight, but shows a certain bending shape
Summary
The contribution of papermaking filling is to reduce production costs and obtain certain properties of the paper, such as filling the gaps in the paper (The filling methods are shown in Fig. 1), improving the evenness of the paper, increasing the whiteness and opacity of the paper, improving the printability and increasing the dimensional stability of the paper, and etc (Zhu et al 2005). Wu and others discussed the physical properties of shell powder (Wu. 2016), wet end performance, and paper filling performance. The feasibility and advantages of shell powder are analyzed by comparing with the properties of light calcium carbonate. Rui started with the research on the effect and feasibility of attapulgite hydration pretreatment (Rui. 2012), organic and inorganic modification on the performance of filled paper products. It can save plant fiber raw materials, reduce the felling of trees, and improve the optical properties such as opacity and hiding power of the paper to a certain extent. Appropriately improve its physical strength index within the allowable range of the paper
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