KR930000220A - Rigid fiberboard - Google Patents

Abstract

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Description

Rigid fiberboard

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Claims (18)

A fiber board containing fibers, binders, fillers, lubricants and water repellents, the hard fiber board for use in pencil shafts. The fibrous plate of claim 1 wherein the fibers are selected from the group consisting of sky fibers, artificial fibers, and mixtures thereof. The fiberboard of claim 2 wherein the natural fiber is a cellulose fiber derived from a source selected from the group consisting of wood pulp, cotton litter, denim oil, newspapers, cardboard boxes, kraft bags, bleached paper, kraft paper, cotton lag and mixtures thereof. . The fibreboard of claim 2 wherein the artificial fibers are selected from the group consisting of polyester fibers, acrylic fibers, aramid fibers, rayon fibers, nylon fibers, glass fibers and mixtures thereof. The fiberboard of claim 1 wherein the binder is selected from the group consisting of a thermosetting resin binder and a water soluble gum and mixtures thereof. The fiberboard of claim 5 wherein the binder is a thermosetting resin binder selected from the group consisting of phenolic resins, melamine resins, urea-formaldehyde resins, latex resins, epoxy resins and mixtures thereof. The fiberboard of claim 5 wherein the binder is a water soluble gum selected from the group consisting of guar gum, carboxymethyl cellulose and hydroxyethyl cellulose and mixtures thereof. The fibrous plate of claim 1 wherein the filler is selected from the group consisting of organic particulate material, inorganic particulate material, bulking fibers and mixtures thereof. The fiberboard of claim 8 wherein the filler is an inorganic particulate material selected from the group consisting of pearlite, vermiculite, glass microfoams and mixtures thereof. Group consisting of corn flour, rice husk powder, peanut shell powder, fruit seed powder, wood flour, ground cork, ground rubber, phenolic resin microfoam, carbon microfoam, saran microfoam and mixtures thereof The fiberboard of claim 8 which is an organic particulate material selected from. The fiberboard of claim 1 wherein the lubricant is selected from the group consisting of polyethylene powder, emulsified wax, powder wax, talc, stearate, fatty acids and mixtures thereof. The fiberboard of claim 1 wherein the waterproofing agent is selected from the group consisting of rosin size, silicone-based water repellent and mixtures thereof. The fiberboard of claim 1 which also contains at least one reaction aid selected from the group consisting of retention aids, antifoam agents, coagulants, cloud phases, pH adjusters and mixtures thereof. The fiberboard of claim 13 wherein the retention aid is a polyamide resin. The fiberboard of claim 1 which also contains at least one salt table. About 38 to 75% fiber, about 10 to 35% binder, about 10 to 30% filler, about 2 to 15% lubricant, about 0.4 to 1.5% waterproofing agent, and about 0 to 3% reaction aid The hard fiber board of Claim 1 containing. A pencil consisting of a marking core and a shaft around the core, which is a shaft formed of fibrous plates containing fibers, binders, fillers, lubricants and waterproofing agents. Claim 17 wherein the fiberboard contains about 38-75% fiber, about 10-35% binder, about 10-30% filler, about 2-15% lubricant, about 0.4-1.5% waterproofing agent and 0-3% reaction aid. Protest pencil. ※ Note: The disclosure is based on the initial application.