Outdoor sofa is a kind of furniture for people to rest, relax and entertain in the outdoors. They are usually made of durable materials that can withstand the effects of various climatic conditions. The classification of outdoor sofas is mainly based on materials, design and function. Rattan Sofa,Teak Sofa,Anti-Water Sofa,Sunscreen Sofa Foshan Shengshi Zhihui Technology Co., Ltd. , https://www.officeroutdoorfurniture.com
Laminating is to coat the plastic film with adhesive, and print it with paper as the substrate. After being pressed by the blanket cylinder and heating roller, the film is formed into a paper-plastic product.
2. What are the requirements for the covered film?
For covered films, whatever type and system is used, the following basic requirements must be met:
1 thickness. The thickness of the film is directly related to the transmittance, refractive index, film fastness, mechanical strength, etc., and the thickness of the film is preferably between 0.01 and 0.02 mm depending on the film itself and the purpose of use. Domestic production of film for the film is 0.02mm thick, imported 0.01mm.
2 surface tension. The plastic film used for the lamination must be corona treated or treated by other main methods. The surface tension of the treated surface should reach 4 Pa ​​(40 dyn/cm 2 ) in order to have good wettability and adhesive properties. At the same time, the corona treatment surface is uniform.
3 transparency. For a plastic film applied directly on the surface of a print, the higher its transparency, the better it is to ensure the best clarity of the printed material to be covered. Transparency is expressed as transmittance, which is the percentage of transmitted light and projected light. The light transmittance of the polyester film is generally 88 to 90%; the light transmittance of the other several plastic films is usually between 92 to 93%.
4 lightfastness. Lightfastness refers to the degree of discoloration of a plastic film under prolonged exposure to light. The plastic film used for coating should have light resistance. Has good light resistance, even after long-term use and storage is still transparent, for example, polyester carbonate film and other films, under the same conditions will easily turn yellowish.
5 mechanical properties. Plastic films are subjected to mechanical forces in the laminating process operation. Therefore, the films must be provided with certain mechanical strength and flexibility characteristics. The mechanical strength of a plastic film can be expressed by technical indexes such as tensile strength, elongation at break, modulus of elasticity, impact strength, and number of foldings.
6 The geometry is stable. The unstable geometrical dimensions of the plastic film and the excessive expansion and contraction rate cause troubles in the laminating operation, and also causes the product to have serious quality problems such as wrinkles and curls. Therefore, it is required that the plastic film has a stable geometry. Said geometric dimensional stability is usually used the following technical indicators: hygroscopic expansion coefficient: the horizontal expansion ratio of the film before and after moisture absorption; thermal expansion coefficient: refers to the ratio of the temperature of the plastic film at different temperatures before and after horizontal expansion; heat distortion temperature: refers to the plastic film case Critical temperature during hot deformation; Cold resistance: It is expressed by the impact of the film at low temperatures and the change in toughness.
7 Chemical stability. The plastic film must be in contact with some solvents, adhesives, and the ink layer of the print during the process operation. Therefore, it must have a certain degree of chemical stability and is not affected by chemical substances.
8 appearance. Plastic film should be flat, no bumps and wrinkles. Film surface irregularities or wrinkles can make the coating uneven, difficult to adhere to the low-pit, and seriously affect the quality of the coating; at the same time, the film also requires no bubbles, shrinkage holes and pinholes and pits, etc. Dust, no impurities, no grease (spots) and other pollution.
9 other. The plastic film must be even and thick, with small horizontal and vertical thickness deviations. In addition, the rewinding should be neat and the ends should be uniform. Because the laminator has a limited adjustment, the loose end at one end will make the glue uneven. Of course, the thin film as the main raw material for the film needs to be low cost.
3 . What is the effect of the ink layer on the quality of the film?
The condition of the ink layer in the printed matter mainly refers to the nature of the paper, the ink properties, the thickness of the ink layer, the graphic text surface, and the integral density of the printed graphic and text. Their influence on the film quality is mainly the influence on the adhesive strength of the printed matter and the film.
1 ink layer thickness. When the printed ink is thick and the area of ​​the graphic is large, these inks change the porous surface characteristics of the paper, closing the pores of many paper fibers, impeding the penetration and diffusion of the adhesive, making it difficult for the printed matter and the plastic film to stick. Together, it is prone to problems such as delamination and blistering. Therefore, in the process selection, offset printing should be used to print the laminated product because the ink layer of the offset printing product is thin (approximately 1 to 2 μm).
2 ink dilute the role. Common ink diluting agents include white ink, weili oil and bright light paste. In the white ink, there are obvious silt particles, which are not tightly bound to the binder. After printing, these pigment particles will float on the surface of the paper and hinder the adhesion. Verite oil is made by rolling aluminum hydroxide and binder. Due to the light weight of aluminum hydroxide, it tends to float on the surface of the ink layer after printing. When the film is covered, a barrier layer is formed between the adhesive and the ink layer, resulting in stickiness. Can not close or blistering. The glossy pulp is made of resin, dry vegetable oil, drier, etc. The texture is delicate and the film is bright. It has similar properties with the conjugated multi-bond terpene resin as the main component, and they have good affinity and can firmly adsorb the polypropylene film on the ink surface.
3 add dry oil. The addition of dry oil to the ink can speed up the drying of the print, but the dry oil adds a large amount of oil, making it easy to make the surface of the ink layer into a glossy, smooth, low-interfacial layer. The adhesive is difficult to wet and infiltrate, affecting the fastness of the film. Therefore, To control the amount of dry oil added.
4 spray powder. Offset printing adopts a dusting process to prevent the printed matter from getting dirty, and a layer of fine particles is formed on the surface of the powdered ink. When the film is coated, the adhesive does not adhere to the ink layer in every place, but binds with these powders to form a false-stick phenomenon, which seriously affects the quality of the film. Therefore, the product to be covered should avoid the use of dusting technology, printed matter that has been dusted, and dry wipes on a dry basis with a dry cloth.
5 gold and silver ink prints. Gold and silver inks are formulated with metal powders and binders. The distribution and homogeneity of the metal powders in the binder are extremely poor, and the ink layers are easily separated during the drying process. These separated metal powders form a barrier between the ink layer and the adhesive layer, affecting the effective bonding of the two interfaces. After the product has been placed for a period of time, wrinkling, blistering, etc. may occur. Therefore, the coating of gold and silver ink prints should be avoided.
6 print ink dry condition. When the ink is not completely dry, it is covered with a film. The high-boiling solvent contained in the ink easily swells and elongates the plastic film. This is the main reason for blistering and delamination of the product after the film is covered. Full drying of the ink layer is the primary condition for guaranteeing the quality of the film. For products that are imprinted and eagerly coated, they can be placed in a drying oven.
4. Why does the humidity of the environment affect the quality of the coating?
The relative humidity in the environment of the film coating shop has an impact on the quality of the coating film. The main reason is that the moisture content changes with the relative humidity in the air between the adhesive and the plastic film and the printed matter. Humidity-sensitive prints can develop internal stresses due to dimensional changes.
For example, the longitudinal stretch rate of the printed matter is 0.5%, and the longitudinal shrinkage of the BOPP film is 4%. If the water absorption of the printed material is excessive and the film stretches, and internal stress is caused between the heat shrinkage of the film, the film product may curl, wrinkle and stick. Not together. In addition, in a high humidity environment, the equilibrium moisture content of the printed matter will also change, and the large amount of moisture absorbed from the air medium will be released from the surface during the hot-press compounding process, stagnating at the adhesive interface, and being formed locally. Non-adhesive phenomenon. Moreover, changes in the balance of moisture in the printed matter (absorbing moisture from the air medium or releasing moisture into the air medium) often occur at the edge of the print, making it a scalloped edge or a tight edge, and it is not easy to form a film with the film during hot press compounding. Good adhesion produces wrinkles, making production unsuccessful.
First, material classification:
1. Wooden outdoor sofa: This type of outdoor sofa is usually made of natural wood, such as teak. They are naturally beautiful and durable, suitable for outdoor Spaces such as gardens and terraces.
2. Metal outdoor sofa: This type of outdoor sofa is usually made of metal materials, such as iron, aluminum, etc. They have the characteristics of corrosion resistance, water resistance, sun protection, suitable for the beach, swimming pool and other humid environment.
3. Artificial materials outdoor sofa: This kind of outdoor sofa is usually made of artificial materials, such as plastic, artificial wood and so on. They have the characteristics of light, easy to clean, suitable for outdoor restaurants, cafes and other commercial places.
Ii. Design classification:
1. Single outdoor sofa: This kind of outdoor sofa is simple in design and suitable for single use. They are usually small and lightweight, suitable for small balconies, garden corners and other places where space is limited.
2. Double outdoor sofa: This kind of outdoor sofa is designed to be comfortable and suitable for two people. They are usually more spacious and suitable for placing in larger Spaces such as terraces and courtyards.
3. Multi-person outdoor sofa: This type of outdoor sofa is spacious and suitable for multi-person use. They often function as a sofa bed and can be used as a makeshift bed. Suitable for outdoor banquet area, holiday villa and other large outdoor space.
Iii. Functional classification:
1. Leisure outdoor sofa: This kind of outdoor sofa design is comfortable, suitable for people to relax in the outdoors. They are usually equipped with soft cushions and cushions to provide comfortable support.
2. Dining outdoor sofa: This type of outdoor sofa is designed for outdoor dining, such as open-air restaurants, cafes, etc. They are usually equipped with a dining table and chairs, providing a convenient dining experience.
Of course, a variety of different sofas can also be freely combined into a sofa combination to meet your different needs.
1. What is a film?