相关实验视频
Updated: Jun 7, 2025

07:21
Twin-Screw Extrusion Process to Produce Renewable Fiberboards
Published on: January 27, 2021
6.3K
利用树树皮颗粒形态学,改善板材生产中的内部结合
Jakob Gößwald1, Marius Cătălin Barbu2,3, Eugenia Mariana Tudor2,3
1Faculty for Forestry and Wood Technology, Mendel University in Brno, Zemedelska 1, 61300 Brno, Czech Republic.
Polymers
|November 9, 2024
概括
这项研究探讨了使用树皮组件用于碎片板 (PB) 生产. 外皮颗粒和树皮纤维的特殊湿处理优化了PB的特性,减少了胀并提高了强度.
科学领域:
- 材料科学 材料科学 材料科学
- 森林产品 森林产品
- 可持续材料 可持续材料
背景情况:
- 全球对木制品的需求不断增长,需要探索替代资源,比如木材行业的副产品.
- 由于其复杂的结构和性质,Bark为碎片板 (PB) 生产提供了一个有希望的,但具有挑战性的补充.
- 目前商业规模的PB生产面临着与树皮集成的局限性.
研究的目的:
- 为了研究在湿状态下分别加工不同的树皮成分,以制造碎片板的潜力.
- 为了评估由外部树皮颗粒,树皮纤维团块,树皮纤维和木材颗粒的混合物制成的碎片板的性能.
- 确定定制加工对树皮材料特性的影响,以优化碎片板生产.
主要方法:
- 三种基于树皮的原材料 (外皮颗粒,树皮纤维块,树皮纤维) 在湿状态下单独加工.
- 颗粒板 (PB) 使用不同比例的这些树皮材料和木质颗粒,用尿素-甲粘合剂生产.
- PB样本的目标密度为0.7g/cm3,厚度为16mm.
主要成果:
- 与树皮纤维相比,外皮颗粒的吸水率和厚度膨胀率大约低40%.
- 皮肤纤维显著提高了约50%的内部键强度,这是由于它们的形态.
- 证实了树皮成分的独特特性,突出了通过定制加工优化潜力.
结论:
- 特殊的树皮成分的湿加工提供了一种可行的策略,以提高碎片板的性能.
- 树皮外层颗粒和树皮纤维具有互补的特性,有利于颗粒板的配方.
- 这种方法为在木制品行业中有效利用树皮作为可持续资源铺平了道路.
相关概念视频
Wood Products
79
Wood products encompass a broad range of materials crafted from wood strands, veneers, lumber, and even waste wood-like shreds, designed for both structural and nonstructural purposes. Various specialized wood products have been developed to enhance strength, durability, and versatility in building applications.
Glue-laminated wood, often referred to as glulam, combines multiple smaller pieces of dimensional lumber using adhesives to form a single, larger piece. Cross-laminated timber consists...
Glue-laminated wood, often referred to as glulam, combines multiple smaller pieces of dimensional lumber using adhesives to form a single, larger piece. Cross-laminated timber consists...
79
Wood Panel Products
70
Wood panel products are essential materials used in construction for applications such as flooring, siding, and roofing, typically available in standard dimensions of 4 feet by 8 feet, with thicknesses varying from one-quarter of an inch to one and one-eighth inches. Among the most common types of wood panels is plywood, which is produced by gluing multiple layers of thin wood veneers under pressure. The grain of the outer veneers runs lengthwise, while the grains of the interior layers run...
70
Lumber
108
Lumber is derived from logs which are harvested, debarked, and processed into long pieces with a rectangular cross-section. The transformation of logs into lumber involves multiple steps, beginning with an automated saw that slices the log into slabs. These slabs are then transported via a conveyor belt to smaller saws, where they are cut into square-edged pieces of specific widths.
Initially, the surfaces of these lumber pieces are rough, and their dimensions may vary slightly from one end to...
Initially, the surfaces of these lumber pieces are rough, and their dimensions may vary slightly from one end to...
108
Wood Surfacing
88
Wood surfacing is a critical finishing process designed to smoothen the wood surface, enhance its dimensional accuracy, and make handling safer. This process compensates for potential shrinkage during the seasoning phase by marginally increasing the wood dimensions before surfacing. It also helps correct some distortions that may occur as the wood dries.
The equipment used in the surfacing process is a plane equipped with rotating blades. This tool efficiently smoothens the wood surface and can...
The equipment used in the surfacing process is a plane equipped with rotating blades. This tool efficiently smoothens the wood surface and can...
88
Softwoods and Hardwoods
144
Softwoods and hardwoods, derived from different types of trees, are distinguished by their leaf structures and cellular compositions, each serving unique purposes in construction and manufacturing. Softwoods come from cone-bearing trees with needle-like leaves and are predominantly composed of longitudinal cells called tracheids and a smaller proportion of radial cells known as rays. Due to their cellular structure, softwoods are commonly used in construction for structural frames, sheathing,...
144
Structural Properties and Dimensions of Lumber
80
Wood's structural properties derive from fibers aligned along the tree's length, contributing significantly to its mechanical strength. Wood exhibits up to twenty times greater tensile strength along these fibers compared to across them, and generally shows better performance under compression than tension. The length of fibers varies, with hardwoods having fibers around one twenty-fifth inch long and softwoods ranging from one-eighth to one-third inch.
The strength characteristics of...
The strength characteristics of...
80

