造纸术英语ppt课件
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Pulp consistency
The consistency of the pulp refers to the promotion of solids to water in the pulp suspension It is important to maintain the correct consistency for optimal paper production
Preservation of history
The ability to write and print on paper has been allowed for the preservation of historical documents and cultural heritage
Art and creativity
in world history • Epilogue
01
The Origin of Papermaking
Inventions in Incident China
The earliest knowledge of paper making dates back to the Han Dynasty (202 BC-220 AD) in China
Copying paper
Forming
In the forming stage, the pull is spread over a wire mesh belt to form a sheet Water is drained from the sheet, and the sheet is transferred to the next stage of processing
Pulp production
The raw materials are mixed and ground to produce pulp, which is a suspension of fibers in water The pull is then stored for further processing
The Chinese discovered the process of making paper by compressing and bonding fibers together, using bamboo pulp as the main raw material
This innovation was a significant milestone in the history of papermaking, leading to the widespread use of paper in various fields such as writing, printing, and painting
English PPT courseware for papermaking technology
目录
CONTENTS
• The Origin of Papermaking • The process flow of
papermaking • Modern papermaking
technology • The impact of papermaking • The position of papermaking
Drying
In the drying stage, the sheet is passed through heated layers to remove retaining moisture The drying process also affects the sheet and sets the final properties of the paper
The spread of papermaking technology Began in the 7th century AD when it was introduced to the Islamic world through trade routes
The Arabs further developed the process, improving the quality and efficiency of paper production
The two main types of chemical pulping processes are kraft pulping and semi pulping Kraft pulping uses sodium hydroxide and sodium sulfate to dissolve the lignin, while sodium pulping uses various sodium salts
By the 10th century, papermaking has spread to Spain and later to Europe and the rest of the world
The development of papermaking technology has a potential impact on global culture, education, and knowledge transmission
03
Modern papermaking technology
Mechanical Pulling
Mechanical Pulling is a process that uses mechanical force to separate lignin from cellular fibers This process is energy intensive and results in a low quality paper product
Papermaking has focused on the development of the fine arts, including calligraphy, watercolor, and mixed media, promoting a creative outlet for artists
02
The process flow of papermaking
Raw material preparation
Raw materials
The main raw materials for papermaking are cellular fibers derived from wood pulp or recycled paper Other materials such as fillers, sizing agents, and fragments may also be added
Some examples of new papermaking technology include the use of alternative fibers, new pushing methods, and advanced sheet forming techniques These technologies aim to reduce the use of energy, water, and raw materials, while also minimizing waste production and environmental impact
VS
Sheet quality
The quality of the sheet depends on factors such as the type of pulp used, beating intensity, and forming procesth good surface smoothness and stickiness
VS
The pulp produced through mechanical pulping is known as groundwood pulp It has a shorter fiber length and lower tension strength compared to chemical pumping processes
New papermaking technology
New papermaking technology refers to recent advancements in papermaking processes that aim to improve the environmental sustainability, production, and quality of the paper product
04
The impact of papermaking
The impact on culture
Spread of knowledge
Paper has enabled the widespread distribution of books and documents, leading to the spread of knowledge and culture across the world
Beating
Beating
The pulse is then beat to disturb the fibers and improve the quality of the paper Beating also helps to develop the paper's texture and strength
Impact on the environment
Water usage
The production of paper uses large amounts of water, leading to water scale in some regions
Pressing and drying
Pressing
In the pressing stage, the sheet is passed through a series of pressures to remove excess water This improves the sheet's dimensional stability and reduces shrinkage during drying
Chemical pumping
Chemical pulping is a process that uses chemicals to dissolve the lignin and separate it from the cell fibers This process results in a higher quality paper product with better physical properties
Early papermaking technology
The early stages of papermaking technology involved manual production methods using simple tools and materials
The process involves pumping and beating fibers, mixing them with water, and then molding and drying the paper on screens
The quality and texture of early paper was correlated through, but it was sufficient for basic writing and printing needs
The spread of papermaking technology
The consistency of the pulp refers to the promotion of solids to water in the pulp suspension It is important to maintain the correct consistency for optimal paper production
Preservation of history
The ability to write and print on paper has been allowed for the preservation of historical documents and cultural heritage
Art and creativity
in world history • Epilogue
01
The Origin of Papermaking
Inventions in Incident China
The earliest knowledge of paper making dates back to the Han Dynasty (202 BC-220 AD) in China
Copying paper
Forming
In the forming stage, the pull is spread over a wire mesh belt to form a sheet Water is drained from the sheet, and the sheet is transferred to the next stage of processing
Pulp production
The raw materials are mixed and ground to produce pulp, which is a suspension of fibers in water The pull is then stored for further processing
The Chinese discovered the process of making paper by compressing and bonding fibers together, using bamboo pulp as the main raw material
This innovation was a significant milestone in the history of papermaking, leading to the widespread use of paper in various fields such as writing, printing, and painting
English PPT courseware for papermaking technology
目录
CONTENTS
• The Origin of Papermaking • The process flow of
papermaking • Modern papermaking
technology • The impact of papermaking • The position of papermaking
Drying
In the drying stage, the sheet is passed through heated layers to remove retaining moisture The drying process also affects the sheet and sets the final properties of the paper
The spread of papermaking technology Began in the 7th century AD when it was introduced to the Islamic world through trade routes
The Arabs further developed the process, improving the quality and efficiency of paper production
The two main types of chemical pulping processes are kraft pulping and semi pulping Kraft pulping uses sodium hydroxide and sodium sulfate to dissolve the lignin, while sodium pulping uses various sodium salts
By the 10th century, papermaking has spread to Spain and later to Europe and the rest of the world
The development of papermaking technology has a potential impact on global culture, education, and knowledge transmission
03
Modern papermaking technology
Mechanical Pulling
Mechanical Pulling is a process that uses mechanical force to separate lignin from cellular fibers This process is energy intensive and results in a low quality paper product
Papermaking has focused on the development of the fine arts, including calligraphy, watercolor, and mixed media, promoting a creative outlet for artists
02
The process flow of papermaking
Raw material preparation
Raw materials
The main raw materials for papermaking are cellular fibers derived from wood pulp or recycled paper Other materials such as fillers, sizing agents, and fragments may also be added
Some examples of new papermaking technology include the use of alternative fibers, new pushing methods, and advanced sheet forming techniques These technologies aim to reduce the use of energy, water, and raw materials, while also minimizing waste production and environmental impact
VS
Sheet quality
The quality of the sheet depends on factors such as the type of pulp used, beating intensity, and forming procesth good surface smoothness and stickiness
VS
The pulp produced through mechanical pulping is known as groundwood pulp It has a shorter fiber length and lower tension strength compared to chemical pumping processes
New papermaking technology
New papermaking technology refers to recent advancements in papermaking processes that aim to improve the environmental sustainability, production, and quality of the paper product
04
The impact of papermaking
The impact on culture
Spread of knowledge
Paper has enabled the widespread distribution of books and documents, leading to the spread of knowledge and culture across the world
Beating
Beating
The pulse is then beat to disturb the fibers and improve the quality of the paper Beating also helps to develop the paper's texture and strength
Impact on the environment
Water usage
The production of paper uses large amounts of water, leading to water scale in some regions
Pressing and drying
Pressing
In the pressing stage, the sheet is passed through a series of pressures to remove excess water This improves the sheet's dimensional stability and reduces shrinkage during drying
Chemical pumping
Chemical pulping is a process that uses chemicals to dissolve the lignin and separate it from the cell fibers This process results in a higher quality paper product with better physical properties
Early papermaking technology
The early stages of papermaking technology involved manual production methods using simple tools and materials
The process involves pumping and beating fibers, mixing them with water, and then molding and drying the paper on screens
The quality and texture of early paper was correlated through, but it was sufficient for basic writing and printing needs
The spread of papermaking technology