Physical properties of handsheets derived from Coi (Streblus asper Lour.) pulp fiber as papermaking material traced from ancient times

Abstract

There have been recent attempts to revive the traditional production of handmade paper from the bark of the Coi (Streblus asper Lour.) tree in Thailand. A sheet sample of Coi handmade paper, made from the traditional production, was collected and examined microscopically for the first time. Film-like material and cubic calcium particles were found on the sheet sample surface, which is consistent with the results of the authors’ previous research. Meanwhile, handsheets derived from Coi pulp fiber, freshly made in the laboratory, demonstrated a low air permeance and brightness with high opacity due to the film-like material and cubic calcium particles. With a high felting power of Coi pulp fiber coupled with a possible strengthening role of the film-like material, both the beaten and unbeaten fibers were used to form handsheets with high strength. Some potential aspects of Coi pulp fiber suitable for creating a unique Thai banknote paper have been demonstrated, for which further studies are suggested.

Properties of mixture of hemp bast and softwood pulp for filter paper manufacture

“…The hemp bast were very long in length and did not collapse well due to thick cell wall. This implies that such fibers with small rigid lumen anatomy can result in voids between fibers when compared to the other pulp fibers [ 51 ].

Fig.

…”

“…The results indicated that the initial freeness of mixture pulps was higher than that of hardwood and softwood pulp [ 51 ]. Beating response, freeness drops due to PFI revolutions which can lead to fibrillation and disruption of fibers, resulting in increased bonding surface area and collapsibility upon beating.…”

“…The dry tensile index, burst index and folding endurance of handsheet increased with increasing beating level. This is probably due to the development of internal delamination and fibrillation of pulp fibers, which resulted in an increased bonding ability and collapsibility through the beating process [ 51 , 55 ]. The dry tensile strength of beaten handsheet are in the range of 41.27–45.46 Nm/g.…”

Valorisation of Underutilized Grass Fibre (Stem) as a Potential Material for Paper Production

“…All laboratory paper handsheets produced with beaten pulp fibres were denser than those made with unbeaten pulp fibres. This appears that the pulp fibre has a high felting power but a low flexibility and collapsibility of the fibre wall [ 66 , 67 ]. Through the visual observation, the brightness of the laboratory paper handsheet clearly reflects the efficiency of lignin removal from chemical pulping from both grass-type biomasses.…”