Self-adhesive labels, also known as self-adhesive labels, instant posts, pressure sensitive stickers. As a kind of logo or decoration application, it can be widely used in children's toys, daily sundries, household appliances, stationery, etc., as a non-permanent sign. Therefore, self-adhesive labels become an important supplement to the nameplate logo.
Self-adhesive materials and their characteristics I. Characteristics of self-adhesive materials Self-adhesive materials are based on paper or film, pre-coated with a layer of adhesive on the back side, usually adhered to the anti-adhesive paper, the front side can be It provides printed graphics, which are peeled off from the release paper and attached to the surface of the object. It has the following features.
(1) It is convenient to use without brushing glue, drowning water, brushing paste, and it is easy to pick up, such as using labeling machine to realize mechanical labeling work.
(2) Simple production can adopt various printing methods or printing graphics, and the process is simple, the production is quick, and the cost is low.
(3) Applicable to the surface of any object, whether it is flat, curved or irregular curved surface, the paste fastness is high, and it does not affect the surface of the product to be attached.
(4) Practical and strong self-adhesive label, with a certain mechanical strength to resist tearing, and has a certain weather resistance, can resist heat, moisture, and aging.
Second, the types of materials and structural features of self-adhesive labels
1. There are many types of material types of self-adhesive labeling materials. According to their characteristics and common varieties, there are the following types.
(1) According to the characteristics of surface materials, it is divided into paper self-adhesive materials, film self-adhesive materials and special self-adhesive materials.
(2) According to the characteristics of adhesives, it is divided into permanent self-adhesive materials and removable self-adhesive materials.
(3) According to the adhesive coating technology classification, it is divided into hot-melt type self-adhesive, solvent-type self-adhesive material and emulsion type self-adhesive material.
(4) According to the chemical characteristics of the adhesive, it is divided into rubber-based and acrylic-based two self-adhesive materials.
(5) According to the characteristics of the bottom paper, it is classified into three types: opaque backing paper (thick backing paper), translucent backing paper (thin backing paper) and transparent backing paper.
According to the above classification, the three basic elements of the facestock layer, the adhesive layer and the bottom paper layer which constitute the self-adhesive labeling material have been divided into different properties, but in actual use, the three basic elements are also The mutually compatible, for example, the acrylic-based adhesive layer may be combined with the paper of the facestock layer or with the film; the underlying paper layer may be an opaque thick-backed paper or a transparent base paper.
Therefore, from the above classification, it is only reasonable to represent the characteristics of a certain element and to select the focal plane of a certain basic element according to actual needs.
2. Material structure and its characteristics From the composition of the basic structure, the self-adhesive material can be regarded as three aspects of the above-mentioned surface layer, adhesive layer and bottom paper layer. However, considering the requirements of the manufacturing process and quality assurance and the finished product of the self-adhesive label, it should have 7 parts: 1-text layer; 2-surface coating; 3-surface layer; 4- Back coating; 5-adhesive; 6-release layer; 7-backing paper (1) The graphic layer is a colored graphic obtained by printing in different ways on the face material, which is a self-adhesive label. Subject content. There is no limit to what kind of content to print the graphic, but what kind of ink is used on the surface material is very particular. Because of the different materials, the selected ink must be adapted to it, in order to produce better bonding fastness. Wear resistance and weather resistance to ensure long-term effectiveness of graphics.
(2) The purpose of the surface coating is to change the surface characteristics of the face material. Such as improving the surface tension, changing the color, adding a protective layer, etc., to better accept the ink and increase the bonding force of the ink and change the color of the surface layer to prevent the printed image from falling off. Surface coatings are mainly used for non-absorbent materials such as aluminum foil, aluminized paper, and various film materials. Generally, paper materials do not require coating.
(3) The surface material layer is the basic material of the label. The front side can accept the printing of the ink layer, print a clear picture, and the back can accept the adhesive, which is the material that Zui finally applies to the adhesive. The commonly used face material for zui is paper, followed by film and other composite materials. Paper should be used as a face material to have a certain strength, usually more than 100g of copper or matt coated paper, and some other special paper; film as a face material, usually polyester (PET), polypropylene ( BOPP), polyvinyl chloride (PVC) film, etc., if used directly, the thickness is between 0.02~0.05mm; if the film is made of composite material, the thickness is generally not more than 0.02mm. Whether it is paper or film, the basic requirement is to be able to accept printing and easy die-cutting, while also requiring some properties that are resistant to discoloration and aging.
(4) The back coat is a coat applied to the back side of the face material. Its main role is as follows.
1 Prevent the penetration of the adhesive into the face material and protect the face material.
2 Increase the adhesion of the adhesive to the face material to avoid sticking to the surface of the product when applied to certain products.
3 Enhance the covering ability of the face material to avoid revealing the color under the label or the information content that has been changed. Even if the label is vivid, it is not confusing with the background color; at the same time, it prevents the covert content such as the company name, address, and price in the product information from being revealed.
(5) Adhesive layer is the adhesive layer, which is the medium for labeling and adhering goods. It is an important component in self-adhesive materials. Its adhesive is generally rubber type (also known as oil glue or solvent). Glue) and acrylic (also known as water gel) two major categories.
The adhesive force of the adhesive layer is not only related to the variety and texture of the adhesive, but also related to the amount of adhesive applied. This is consistent with the requirements of the "double-sided adhesive" commonly used in the nameplate industry. The amount of glue applied is usually expressed in "dao" or "filament" in the production of self-adhesive paper (or double-sided tape). "Channel" or "wire" is not a standard unit of measurement, "one" or "A silk" has the meaning equivalent to a coating thickness of 0.01 mm. It is difficult to measure with such a thickness. At the same time, the adhesive layer is an elastic body, which is difficult to measure when measuring. Therefore, it should be made of a rubber layer per square meter. The amount of adhesive used is expressed as practical. The coating amount of the self-adhesive layer is generally (24 ± 3) g / m 2 . The amount of the adhesive to be applied should also vary depending on the season and the temperature of the region, and also on the degree of roughness and smoothness of the surface of the coated substrate. If the coating amount is too large, the phenomenon of bleeding will occur. When cutting or punching, it will also bring difficulties; the coating amount is too small, the viscosity is not enough, and the label is easy to fall off.
(6) The release layer is a layer of silicone resin coated on the backing paper, also commonly referred to as silicone oil. The application of silicone oil can reduce the surface tension of the base paper, avoid the adhesion of the adhesive to the base paper, and also make the adhesive layer on the surface material properly adhere to the surface, which is beneficial to the fixing and separation of the adhesive, and is convenient to complete. Printing and cutting operations.
The amount of silicone oil applied to the release layer has a certain relationship with the use of the self-adhesive. The silicone oil is too small, the surface material is difficult to separate, and the use is inconvenient; the silicone oil is too much, the adhesion is not strong, and the surface material and the bottom paper are easily loosened or peeled off. In general, the amount of silicone oil applied is about 1 g/m2, depending on the roughness of the base paper.
(7) The effect of the bottom paper is to accept the release agent, to protect the adhesive on the back side of the face material, the uncoated and uncalendered white paper is uncoated but calendered. White paper matte coated uncalendered white paper coated and calendered white paper, uncalendered white paper by coating process.
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Self-adhesive materials and their characteristics I. Characteristics of self-adhesive materials Self-adhesive materials are based on paper or film, pre-coated with a layer of adhesive on the back side, usually adhered to the anti-adhesive paper, the front side can be It provides printed graphics, which are peeled off from the release paper and attached to the surface of the object. It has the following features.
(1) It is convenient to use without brushing glue, drowning water, brushing paste, and it is easy to pick up, such as using labeling machine to realize mechanical labeling work.
(2) Simple production can adopt various printing methods or printing graphics, and the process is simple, the production is quick, and the cost is low.
(3) Applicable to the surface of any object, whether it is flat, curved or irregular curved surface, the paste fastness is high, and it does not affect the surface of the product to be attached.
(4) Practical and strong self-adhesive label, with a certain mechanical strength to resist tearing, and has a certain weather resistance, can resist heat, moisture, and aging.
Second, the types of materials and structural features of self-adhesive labels
1. There are many types of material types of self-adhesive labeling materials. According to their characteristics and common varieties, there are the following types.
(1) According to the characteristics of surface materials, it is divided into paper self-adhesive materials, film self-adhesive materials and special self-adhesive materials.
(2) According to the characteristics of adhesives, it is divided into permanent self-adhesive materials and removable self-adhesive materials.
(3) According to the adhesive coating technology classification, it is divided into hot-melt type self-adhesive, solvent-type self-adhesive material and emulsion type self-adhesive material.
(4) According to the chemical characteristics of the adhesive, it is divided into rubber-based and acrylic-based two self-adhesive materials.
(5) According to the characteristics of the bottom paper, it is classified into three types: opaque backing paper (thick backing paper), translucent backing paper (thin backing paper) and transparent backing paper.
According to the above classification, the three basic elements of the facestock layer, the adhesive layer and the bottom paper layer which constitute the self-adhesive labeling material have been divided into different properties, but in actual use, the three basic elements are also The mutually compatible, for example, the acrylic-based adhesive layer may be combined with the paper of the facestock layer or with the film; the underlying paper layer may be an opaque thick-backed paper or a transparent base paper.
Therefore, from the above classification, it is only reasonable to represent the characteristics of a certain element and to select the focal plane of a certain basic element according to actual needs.
2. Material structure and its characteristics From the composition of the basic structure, the self-adhesive material can be regarded as three aspects of the above-mentioned surface layer, adhesive layer and bottom paper layer. However, considering the requirements of the manufacturing process and quality assurance and the finished product of the self-adhesive label, it should have 7 parts: 1-text layer; 2-surface coating; 3-surface layer; 4- Back coating; 5-adhesive; 6-release layer; 7-backing paper (1) The graphic layer is a colored graphic obtained by printing in different ways on the face material, which is a self-adhesive label. Subject content. There is no limit to what kind of content to print the graphic, but what kind of ink is used on the surface material is very particular. Because of the different materials, the selected ink must be adapted to it, in order to produce better bonding fastness. Wear resistance and weather resistance to ensure long-term effectiveness of graphics.
(2) The purpose of the surface coating is to change the surface characteristics of the face material. Such as improving the surface tension, changing the color, adding a protective layer, etc., to better accept the ink and increase the bonding force of the ink and change the color of the surface layer to prevent the printed image from falling off. Surface coatings are mainly used for non-absorbent materials such as aluminum foil, aluminized paper, and various film materials. Generally, paper materials do not require coating.
(3) The surface material layer is the basic material of the label. The front side can accept the printing of the ink layer, print a clear picture, and the back can accept the adhesive, which is the material that Zui finally applies to the adhesive. The commonly used face material for zui is paper, followed by film and other composite materials. Paper should be used as a face material to have a certain strength, usually more than 100g of copper or matt coated paper, and some other special paper; film as a face material, usually polyester (PET), polypropylene ( BOPP), polyvinyl chloride (PVC) film, etc., if used directly, the thickness is between 0.02~0.05mm; if the film is made of composite material, the thickness is generally not more than 0.02mm. Whether it is paper or film, the basic requirement is to be able to accept printing and easy die-cutting, while also requiring some properties that are resistant to discoloration and aging.
(4) The back coat is a coat applied to the back side of the face material. Its main role is as follows.
1 Prevent the penetration of the adhesive into the face material and protect the face material.
2 Increase the adhesion of the adhesive to the face material to avoid sticking to the surface of the product when applied to certain products.
3 Enhance the covering ability of the face material to avoid revealing the color under the label or the information content that has been changed. Even if the label is vivid, it is not confusing with the background color; at the same time, it prevents the covert content such as the company name, address, and price in the product information from being revealed.
(5) Adhesive layer is the adhesive layer, which is the medium for labeling and adhering goods. It is an important component in self-adhesive materials. Its adhesive is generally rubber type (also known as oil glue or solvent). Glue) and acrylic (also known as water gel) two major categories.
The adhesive force of the adhesive layer is not only related to the variety and texture of the adhesive, but also related to the amount of adhesive applied. This is consistent with the requirements of the "double-sided adhesive" commonly used in the nameplate industry. The amount of glue applied is usually expressed in "dao" or "filament" in the production of self-adhesive paper (or double-sided tape). "Channel" or "wire" is not a standard unit of measurement, "one" or "A silk" has the meaning equivalent to a coating thickness of 0.01 mm. It is difficult to measure with such a thickness. At the same time, the adhesive layer is an elastic body, which is difficult to measure when measuring. Therefore, it should be made of a rubber layer per square meter. The amount of adhesive used is expressed as practical. The coating amount of the self-adhesive layer is generally (24 ± 3) g / m 2 . The amount of the adhesive to be applied should also vary depending on the season and the temperature of the region, and also on the degree of roughness and smoothness of the surface of the coated substrate. If the coating amount is too large, the phenomenon of bleeding will occur. When cutting or punching, it will also bring difficulties; the coating amount is too small, the viscosity is not enough, and the label is easy to fall off.
(6) The release layer is a layer of silicone resin coated on the backing paper, also commonly referred to as silicone oil. The application of silicone oil can reduce the surface tension of the base paper, avoid the adhesion of the adhesive to the base paper, and also make the adhesive layer on the surface material properly adhere to the surface, which is beneficial to the fixing and separation of the adhesive, and is convenient to complete. Printing and cutting operations.
The amount of silicone oil applied to the release layer has a certain relationship with the use of the self-adhesive. The silicone oil is too small, the surface material is difficult to separate, and the use is inconvenient; the silicone oil is too much, the adhesion is not strong, and the surface material and the bottom paper are easily loosened or peeled off. In general, the amount of silicone oil applied is about 1 g/m2, depending on the roughness of the base paper.
(7) The effect of the bottom paper is to accept the release agent, to protect the adhesive on the back side of the face material, the uncoated and uncalendered white paper is uncoated but calendered. White paper matte coated uncalendered white paper coated and calendered white paper, uncalendered white paper by coating process.
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