大片刨花板热压过程中温度、气压和含水率变化规律研究
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摘要
大片刨花板具有较好的物理力学性能和价格优势,与普通刨花板和胶合板相比,是一种性价比很高的板材,应用领域广泛,市场空间巨大。因此,进行大片刨花板成型机理和制造工艺技术的研究十分必要。
热压过程是大片刨花板生产的关键环节,而热压过程中板坯的温度、湿度和压力场的分布对于成板的物理力学性能有着重要影响。因此,研究热压过程中热质传递规律、探索板坯内部热质传递与成板性能的关系,对于深入理解刨花板成型机理、合理制定热压工艺、缩短热压时间、提高生产效率具有重要意义。
论文采用自行研制的实验测试系统,对大片刨花板热压过程中板坯内的温度、气压和含水率进行了实时连续、自动测量。根据测试结果和理论分析,得出了温度、压力和含水率在板坯内部随时间变化的分布规律、影响因素和三者之间的关系。论文研究结果如下:
1、热压过程中板坯内部温度变化规律的研究
(1)板坯内部温度梯度变化规律
热压过程中,板坯纵截面上始终存在着温度梯度,热压开始时温度梯度最大,随着热压的进行,温度梯度逐渐减小;板坯横截面上各点的温度几乎相同,温度梯度很小,可以将横截面看作为等温面。由此可知,可认为同一时刻板坯各纵截面的温度梯度相同。
(2)由施胶与未施胶板坯的热压实验对比实验结果分析可知,胶粘剂对热压过程中大片刨花板内部温度分布的影响可以忽略不计。
(3)热压过程中,大片刨花板的温度变化可以分为两个阶段:快速升温阶段和慢速升温阶段。目标厚度、热压温度、目标密度和含水率等因素对升温速率的影响在两个阶段中表现不同:
①在快速升温阶段:目标厚度和热压温度对单位厚度的板坯升温速率有着极其显著的影响,其次是目标密度和含水率的交互作用。目标密度大,板坯的水分含量就大,所以含水率和目标密度的交互作用对板坯升温速率有显著性影响。升温速率随热压温度的提高而增大,目标厚度小的板坯升温快。
Compared with regular particle board and plywood, flakeboard has better physico-mechanical properties and price advantage, which is also a board with high performance price ratio .So it is used widely and has vast market. Therefore, it is essential to study its forming mechanism and manufacturing technology.
Hot pressing procedure is the key to the flakeboard production. During the process, the physico-mechanical properties of the board are greatly influenced by the distribution of temperature, humidity and pressure in the mat. Thus, in order to thoroughly understand the forming mechanism, establish hot pressing schedule, shorten hot pressing time, and improve the productivity, it is important to study the rule of the heat & mass transfer and explore the relationship between the heat & mass transfer and the properties of board.
In this paper, the real-time temperature, pressure and moisture content in the mat are measured consistently and automatically with self-designed test system. Based on the test results and academic analysis, we got the distribution rule and influence-factors of them as well as the relationship among them.
The results are as follows:
1 The rule of the temperature gradient variation in the mat
1) The rule of the temperature gradient variation in the mat
During hot pressing, temperature gradient always exists on the vertical section It is the largest at the beginning and decreases gradually. Unlike the vertical section, the temperature is almost the same over the cross section, and the temperature gradient is quite small, especially for the glued mat. So, the cross section can be viewed as a forisothermal lay. Therefore it was considered that the temperature gradient over the cross sections of the mat is the same.
2) From hot pressing experiment results of the glued and unglued mat, it can be known that the influence of adhesives on the temperature distribution of flakeboard can be neglected.
3) During hot pressing, the temperature variation of flakeboard can be divided into rapid increasing stage and slow increasing stage. In the two stages, the influence of aim thickness, hot pressing temperature, aim density and moisture content on temperature increasing velocity is different.
热压过程是大片刨花板生产的关键环节,而热压过程中板坯的温度、湿度和压力场的分布对于成板的物理力学性能有着重要影响。因此,研究热压过程中热质传递规律、探索板坯内部热质传递与成板性能的关系,对于深入理解刨花板成型机理、合理制定热压工艺、缩短热压时间、提高生产效率具有重要意义。
论文采用自行研制的实验测试系统,对大片刨花板热压过程中板坯内的温度、气压和含水率进行了实时连续、自动测量。根据测试结果和理论分析,得出了温度、压力和含水率在板坯内部随时间变化的分布规律、影响因素和三者之间的关系。论文研究结果如下:
1、热压过程中板坯内部温度变化规律的研究
(1)板坯内部温度梯度变化规律
热压过程中,板坯纵截面上始终存在着温度梯度,热压开始时温度梯度最大,随着热压的进行,温度梯度逐渐减小;板坯横截面上各点的温度几乎相同,温度梯度很小,可以将横截面看作为等温面。由此可知,可认为同一时刻板坯各纵截面的温度梯度相同。
(2)由施胶与未施胶板坯的热压实验对比实验结果分析可知,胶粘剂对热压过程中大片刨花板内部温度分布的影响可以忽略不计。
(3)热压过程中,大片刨花板的温度变化可以分为两个阶段:快速升温阶段和慢速升温阶段。目标厚度、热压温度、目标密度和含水率等因素对升温速率的影响在两个阶段中表现不同:
①在快速升温阶段:目标厚度和热压温度对单位厚度的板坯升温速率有着极其显著的影响,其次是目标密度和含水率的交互作用。目标密度大,板坯的水分含量就大,所以含水率和目标密度的交互作用对板坯升温速率有显著性影响。升温速率随热压温度的提高而增大,目标厚度小的板坯升温快。
Compared with regular particle board and plywood, flakeboard has better physico-mechanical properties and price advantage, which is also a board with high performance price ratio .So it is used widely and has vast market. Therefore, it is essential to study its forming mechanism and manufacturing technology.
Hot pressing procedure is the key to the flakeboard production. During the process, the physico-mechanical properties of the board are greatly influenced by the distribution of temperature, humidity and pressure in the mat. Thus, in order to thoroughly understand the forming mechanism, establish hot pressing schedule, shorten hot pressing time, and improve the productivity, it is important to study the rule of the heat & mass transfer and explore the relationship between the heat & mass transfer and the properties of board.
In this paper, the real-time temperature, pressure and moisture content in the mat are measured consistently and automatically with self-designed test system. Based on the test results and academic analysis, we got the distribution rule and influence-factors of them as well as the relationship among them.
The results are as follows:
1 The rule of the temperature gradient variation in the mat
1) The rule of the temperature gradient variation in the mat
During hot pressing, temperature gradient always exists on the vertical section It is the largest at the beginning and decreases gradually. Unlike the vertical section, the temperature is almost the same over the cross section, and the temperature gradient is quite small, especially for the glued mat. So, the cross section can be viewed as a forisothermal lay. Therefore it was considered that the temperature gradient over the cross sections of the mat is the same.
2) From hot pressing experiment results of the glued and unglued mat, it can be known that the influence of adhesives on the temperature distribution of flakeboard can be neglected.
3) During hot pressing, the temperature variation of flakeboard can be divided into rapid increasing stage and slow increasing stage. In the two stages, the influence of aim thickness, hot pressing temperature, aim density and moisture content on temperature increasing velocity is different.
引文
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