| Wastepaper fiber used as raw material together with corn starch as additive in a compression, molding process was studied. Added starch in the fiber performs both as flow aid in compression molding and as adhesive to reinforce the composite. Properties relating to processing conditions of the fiber/starch composite were researched for making packaging materials for heavy loading application.Five mixing process techniques were studied and compared, according the effect to sample strength originated from pulping, proportion of fiber to starch and sample making conditions, the techniques were modified and focused on two suitable processing conditions. One method is to pulp waste fiber with1%consistence, then mixed with gelatinized starch after the pulp water content controlled to65%. Another way is to add raw starch directly to the pulp slurry with1%concentration, mix the two phases to keep part of added starch remaining on the surface of the fiber after liquid being drained. In order to determine the amount of starch content retained by types of fiber,5varied proportions of two types of waste paper fibers (newspaper fibers and corrugated fiber) were designed, relationship of retained starch and different proportion of mixed-fibers was defined,Based on two suitable processing conditions, research on different starch content, different fiber ratio to sample mechanical properties of materials found that when the ratio of corrugated fiber to newspaper fiber is1:3, the samples have suitable mechanical strength.Molding process temperatures, pressure, and relationship between the mechanical properties of materials and molding process parameters for practical applications were obtained.By experimental study of starch content, moisture content to the fibers/starch mixture-flow properties of the materials, processing conditions of compressing pressure, temperature, fibers/starch mixture’s flow ability were decide, and feasibility of compression molding based on the conditions was verified. |
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