In the printing industry, paper is an indispensable material: In addition to choosing different printing methods, different types of printed materials are also very important for the selection of various types of paper. The cost and selling price of printed products will also be affected by the printing method and the choice of paper. Therefore, there should be a basic understanding of paper.
In Offset Printing Offset Printing, the paper passes through two cylinders for imprinting and receives the moisture from the printing plate, so the offset printing paper must withstand moisture without distortion Characteristics, and the paper shrinkage and expansion rate in the normal temperature and temperature as little as possible. Paper that is partially or completely deformed due to cold, heat, dryness, and humidity is not conducive to offset printing. If the paper becomes distorted, the most important thing is that it is difficult to align various colors in multi-color printing, except that the paper will be folded when printing. If paper looseness is added, paper fluffs fall off during the printing process, or the fibers of the paper are sticky due to the looseness of the ink, the printed product is difficult to achieve the desired effect, so the offset printing is better than the typography. Better quality paper is needed.
In letterpress typography for letterpress printing, if you want to obtain finer prints or screens, you must choose papers with good paper and smooth paper. When the printing plate is contaminated with ink, it is directly imprinted on the paper. The printing plate is a flat hard metal surface. For example, the surface of the paper is rough and rough, and the fine dots are printed in a rare and complete manner. Offset printing is different, because the offset printing plate is not directly printed on the paper, but is first embossed on a flexible rubber cylinder and then transferred to the paper. Such an imprinting method is softer than the letterpress. Much more. Therefore, when printing typographical images, the secret must use a smooth, slightly soft paper.
In addition to printing four-color images on a four-color machine, color printing paper is usually printed on a monochrome or two-color machine. The stability of the paper surface is extremely important. The humidity and humidity of the paper source are different from the temperature and temperature in the printing shop. When the paper is turned on, the paper will change accordingly, and the humidity will be high and the paper will stretch. Otherwise, it will shrink. If the paper shrinks and elongates during the printing process, overprinting four colors is difficult. So a good offset printing plant should have air and temperature regulation. In order to adapt the paper to the temperature and the temperature in the workshop, the printing company usually divides the paper into small stacks and hangs it in the workshop for a day or two. After the paper has been stretched, it can be removed and used. This method is called “hanging paperâ€. .
Classification of Paper Paper is generally classified according to the following points: 1 paper, 2 weight, 3 paper, 4 uses.
(1) Paper quality: Most of the raw materials for papermaking are wood, wood is made into pulp, bleached, washed, dyed and other procedures, plus other raw materials such as cotton fibers, minerals, and pigments; the former is used to strengthen The toughness of the paper and fills the voids between the fibers; the latter enhances the opacity, weight, and color of the paper. According to the different methods of bleaching and dyeing, pulp can be divided into chemical pulp and mechanical pulp. The former is to produce high quality paper such as book paper and bible paper; the latter is to produce cheap paper such as newsprint. It can also be used according to the needs of the finished product.
(b) Weight: The purchase of paper is different from the purchase of cloth. The area and length are used to buy cloth. The paper was bought on a weight basis. The U.S. is measured in pounds, and Europe is measured in weight per square meter, which is the unit of weight in international paper.
For example, a 100-pound weight paper, the U.S. opinion on the weight of paper is that the original paper of this kind of paper, 1 Ream 500 weight is 100. If the paper weight is 80 pounds, you can think it is thinner than 100 pounds paper. However, it is gradually being replaced by the metric system. Calculated in gsm or G/î–» per square meter.
The weight unit of international paper is first adopted in Europe. The weight of one square meter is the weight of the paper. In this way, regardless of the type of paper, it is easy to know what the weight of the paper is by simply identifying the thickness in the hand.
(3) Degree of paper: Hong Kong has a lot of paper sizes because of many countries and places of origin. For example, the degree of paper used in Europe is 70cm x 10cm, the size of the paper used in the United States is 22 1/2" x 35", and the degree of paper used in Hong Kong is 31" x 43" and 35" x 47".
The size of Hong Kong's common publications is mostly one, eighty-one, thirty-two, or thirty-two copies of the paper's original (31′′×43′′) or other dimensions that can minimize the amount of paper wasted. For example, Bond paper has an original size of 81/2′′×11′′, which is 22′′×34′′, and we call it the degree of stationery.
As for the metric paper, it is divided into A, B, C three international paper degrees. A degree is used to print books, formats, text rooms (account department), etc. B degrees are mostly used for printing advertisements or posters. The C degree is used to print envelopes, folders, etc. The degree A is divided into three degrees: A degree, RA degree, and SRA degree. The degree A is the degree of completion of the cutting. For example, A4 is the completion of the sixteen degrees of opening, and A5 is 32 degrees. RA is the "clamping" when cutting edge and printing are reserved. SRA is reserved for bleeding. RA and SRA are the size of the paper at the time of printing. After being nailed and folded, it becomes the finished size of A degree.
(d) Uses: All types of paper have their own uses, and paper is very diverse, and names are often named after their use. Let us list the most common ones as follows:
Newsprint: As the name implies, it is used in the printing of newspapers. The paper is soft and fragile, but it has strong ink absorption ability, yellowish color or ash, and is suitable for high-speed printing. It is an inexpensive paper.
Book paper: also known as forest paper, Dowling is the name of the American paper mill, book paper is better than newsprint paper, white and opaque, suitable for halftone screen printing. The crepe paper can be said to be a thick book.
Book-filled paper: A book-filled paper is a type of printed paper between newsprint and book paper. Its surface is smooth like a book, but paper is like a newsprint. It is to let newsprint go through a heated cylinder and smooth the rough surface. . This has greatly improved the quality of printing, and most popular publications sell this type of paper.
Powder paper: The paper or reedgrass is used as the base layer, and a layer of clay or mineral powder is added on the surface or both sides of the paper, and the surface is extremely smooth and glossy. Advanced powders are dull and are called "dumb" glossy papers or "dumb" powders. The surface is treated extra so as to be very smooth. Suitable for fine dots. Color printing.
Typing Paper and No. 2 Paper: Both are thin book paper, depending on the circumstances. Weight 33gsm is typing paper, 45gsm to 60gsm is number 2 paper, 70gsm is book paper. Less than 45gsm is called rooted paper. Most of these papers are used for joint documents or multiple sheets of paper and carbon paper is used for copying.
Paper: Paper can be said to be a thick book. It can be used for paper boxes, invitations, and decorations. Premium paper is available for use as a luxury gift.
Book Paper: Paper for the cover of general books and magazines. The characteristics are thick, durable, and easy to inflection. The surface treatment has the shapes of bumps, ripples, stripes, and head lines; there are many kinds of changes in colors and patterns. .
There are many types of paper, which are not as broad as those mentioned above for printing purposes. Therefore, they are not listed in detail.
In Offset Printing Offset Printing, the paper passes through two cylinders for imprinting and receives the moisture from the printing plate, so the offset printing paper must withstand moisture without distortion Characteristics, and the paper shrinkage and expansion rate in the normal temperature and temperature as little as possible. Paper that is partially or completely deformed due to cold, heat, dryness, and humidity is not conducive to offset printing. If the paper becomes distorted, the most important thing is that it is difficult to align various colors in multi-color printing, except that the paper will be folded when printing. If paper looseness is added, paper fluffs fall off during the printing process, or the fibers of the paper are sticky due to the looseness of the ink, the printed product is difficult to achieve the desired effect, so the offset printing is better than the typography. Better quality paper is needed.
In letterpress typography for letterpress printing, if you want to obtain finer prints or screens, you must choose papers with good paper and smooth paper. When the printing plate is contaminated with ink, it is directly imprinted on the paper. The printing plate is a flat hard metal surface. For example, the surface of the paper is rough and rough, and the fine dots are printed in a rare and complete manner. Offset printing is different, because the offset printing plate is not directly printed on the paper, but is first embossed on a flexible rubber cylinder and then transferred to the paper. Such an imprinting method is softer than the letterpress. Much more. Therefore, when printing typographical images, the secret must use a smooth, slightly soft paper.
In addition to printing four-color images on a four-color machine, color printing paper is usually printed on a monochrome or two-color machine. The stability of the paper surface is extremely important. The humidity and humidity of the paper source are different from the temperature and temperature in the printing shop. When the paper is turned on, the paper will change accordingly, and the humidity will be high and the paper will stretch. Otherwise, it will shrink. If the paper shrinks and elongates during the printing process, overprinting four colors is difficult. So a good offset printing plant should have air and temperature regulation. In order to adapt the paper to the temperature and the temperature in the workshop, the printing company usually divides the paper into small stacks and hangs it in the workshop for a day or two. After the paper has been stretched, it can be removed and used. This method is called “hanging paperâ€. .
Classification of Paper Paper is generally classified according to the following points: 1 paper, 2 weight, 3 paper, 4 uses.
(1) Paper quality: Most of the raw materials for papermaking are wood, wood is made into pulp, bleached, washed, dyed and other procedures, plus other raw materials such as cotton fibers, minerals, and pigments; the former is used to strengthen The toughness of the paper and fills the voids between the fibers; the latter enhances the opacity, weight, and color of the paper. According to the different methods of bleaching and dyeing, pulp can be divided into chemical pulp and mechanical pulp. The former is to produce high quality paper such as book paper and bible paper; the latter is to produce cheap paper such as newsprint. It can also be used according to the needs of the finished product.
(b) Weight: The purchase of paper is different from the purchase of cloth. The area and length are used to buy cloth. The paper was bought on a weight basis. The U.S. is measured in pounds, and Europe is measured in weight per square meter, which is the unit of weight in international paper.
For example, a 100-pound weight paper, the U.S. opinion on the weight of paper is that the original paper of this kind of paper, 1 Ream 500 weight is 100. If the paper weight is 80 pounds, you can think it is thinner than 100 pounds paper. However, it is gradually being replaced by the metric system. Calculated in gsm or G/î–» per square meter.
The weight unit of international paper is first adopted in Europe. The weight of one square meter is the weight of the paper. In this way, regardless of the type of paper, it is easy to know what the weight of the paper is by simply identifying the thickness in the hand.
(3) Degree of paper: Hong Kong has a lot of paper sizes because of many countries and places of origin. For example, the degree of paper used in Europe is 70cm x 10cm, the size of the paper used in the United States is 22 1/2" x 35", and the degree of paper used in Hong Kong is 31" x 43" and 35" x 47".
The size of Hong Kong's common publications is mostly one, eighty-one, thirty-two, or thirty-two copies of the paper's original (31′′×43′′) or other dimensions that can minimize the amount of paper wasted. For example, Bond paper has an original size of 81/2′′×11′′, which is 22′′×34′′, and we call it the degree of stationery.
As for the metric paper, it is divided into A, B, C three international paper degrees. A degree is used to print books, formats, text rooms (account department), etc. B degrees are mostly used for printing advertisements or posters. The C degree is used to print envelopes, folders, etc. The degree A is divided into three degrees: A degree, RA degree, and SRA degree. The degree A is the degree of completion of the cutting. For example, A4 is the completion of the sixteen degrees of opening, and A5 is 32 degrees. RA is the "clamping" when cutting edge and printing are reserved. SRA is reserved for bleeding. RA and SRA are the size of the paper at the time of printing. After being nailed and folded, it becomes the finished size of A degree.
(d) Uses: All types of paper have their own uses, and paper is very diverse, and names are often named after their use. Let us list the most common ones as follows:
Newsprint: As the name implies, it is used in the printing of newspapers. The paper is soft and fragile, but it has strong ink absorption ability, yellowish color or ash, and is suitable for high-speed printing. It is an inexpensive paper.
Book paper: also known as forest paper, Dowling is the name of the American paper mill, book paper is better than newsprint paper, white and opaque, suitable for halftone screen printing. The crepe paper can be said to be a thick book.
Book-filled paper: A book-filled paper is a type of printed paper between newsprint and book paper. Its surface is smooth like a book, but paper is like a newsprint. It is to let newsprint go through a heated cylinder and smooth the rough surface. . This has greatly improved the quality of printing, and most popular publications sell this type of paper.
Powder paper: The paper or reedgrass is used as the base layer, and a layer of clay or mineral powder is added on the surface or both sides of the paper, and the surface is extremely smooth and glossy. Advanced powders are dull and are called "dumb" glossy papers or "dumb" powders. The surface is treated extra so as to be very smooth. Suitable for fine dots. Color printing.
Typing Paper and No. 2 Paper: Both are thin book paper, depending on the circumstances. Weight 33gsm is typing paper, 45gsm to 60gsm is number 2 paper, 70gsm is book paper. Less than 45gsm is called rooted paper. Most of these papers are used for joint documents or multiple sheets of paper and carbon paper is used for copying.
Paper: Paper can be said to be a thick book. It can be used for paper boxes, invitations, and decorations. Premium paper is available for use as a luxury gift.
Book Paper: Paper for the cover of general books and magazines. The characteristics are thick, durable, and easy to inflection. The surface treatment has the shapes of bumps, ripples, stripes, and head lines; there are many kinds of changes in colors and patterns. .
There are many types of paper, which are not as broad as those mentioned above for printing purposes. Therefore, they are not listed in detail.
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