Main technical characteristics of the hottest synt

The main technical characteristics of synthetic paper and its application in the field of labels

while human civilization is developing rapidly, it makes full use of environmental resources, causing environmental changes and destruction, which has affected human life. Although the emergence and promotion of synthetic paper cannot change this situation, it is, after all, a material that can alleviate environmental damage. At the end of the 20th century, synthetic paper with polyolefin as the main material appeared. Because it has two properties of paper and plastic, it can replace natural paper in many special fields because of its light weight and good rigidity

synthetic paper has a development history of more than 30 years abroad, and has achieved early and rapid development in the United States, Japan and other developed countries. The raw material source and production process of natural fiber paper have caused great changes and damage to the environment. With the strengthening of global environmental protection awareness, new synthetic paper continues to appear, and its application scope continues to expand. The sales volume of global synthetic paper is growing at a rate of 10% every year, and the pace of synthetic paper partially replacing fiber paper is accelerating

at present, the varieties of synthetic paper are mainly polypropylene and polyethylene. Companies that produce synthetic paper with polypropylene as the base material include Japan Prince Oil Chemical Co., Ltd., Nissin textile Jishui Chemical Co., Ltd., Britain BxL, DuPont of the United States, France Priya, Taiwan Formosa Plastics, etc. companies that produce synthetic paper with HDPE as the base material include Japan Mitsui, Japan Nakagawa, Switzerland Shulman, Germany alpine and other companies

China's synthetic paper started late, the market development is insufficient, and the technology still needs to be further improved. At present, the consumption is mainly imported, basically polypropylene synthetic paper, which is used for clothing bags, handbags, woven bags, offset printing, silk printing, advertising spray painting, books, printing trademarks, etc., of which advertising spray painting accounts for 40%, printing trademarks account for 15%, woven bags, offset printing, silk printing accounts for 10%, handbags, clothing bags account for 10%, books account for 5%. According to the thickness specification, the consumption of 40~50 microns accounts for 30%, the consumption of 90~150 microns accounts for 40%, and the consumption of other thicknesses accounts for 30%

now let's talk about some main technical characteristics of synthetic paper:

1. Characteristics of synthetic paper:

1. Environmental protection: the source of raw materials and production process of polypropylene synthetic paper will not cause the environment. Let the material testing machine continue to stretch the standard tensile samples, and the products can be recycled. Even if they are incinerated, they will not produce toxic gases and cause secondary public hazards, which meets the requirements of modern environmental protection

2. Superior performance than ordinary paper: synthetic paper has the characteristics of high strength, tear resistance, perforation resistance, wear resistance, folding resistance, moisture resistance, moth resistance, etc

3. It is more widely used than ordinary paper: synthetic paper has excellent water resistance, which makes it especially suitable for outdoor advertising and non paper trademark labels. Synthetic paper can be used in a dust-free room because it does not generate dust and does not shed hair. It can be in direct contact with food

4. Superior processing performance. Cutting, die cutting, embossing, bronzing, drilling, hot folding, bonding and other processing methods can be adopted

II. Production methods of synthetic paper:

since the development of synthetic paper, the main production methods include calendering, tape casting, film blowing and biaxial stretching. The main manufacturers are: yvpo in Japan, Nanya in Taiwan, China, and Priya in France. Only a few domestic enterprises can produce, with relatively poor quality and instability. Here are several production methods:

1. Calendering method

its equipment is mainly made in Italy to produce PP based synthetic paper. That is, through batching, mixing, internal mixing, extruding, refining to calendering. Slitting into synthetic paper products, the key equipment is the extruder produced in Italy, which is completed at one time and carried out continuously, with high efficiency and good quality. The disadvantage of calendering process is that the process is complex. It is generally used to produce synthetic paper products above 0.1mm. The product proportion is large and the equipment price is expensive, but the product surface is smooth, which is suitable for printing high-grade samples and book covers

2. Casting method

the mixing, internal mixing, mixing and other processes of cast synthetic paper are similar to those of calendering, except that the calender is replaced by the casting machine. The characteristics of the casting method are that there is a large speed difference between the extrusion speed of the die head and the rotation of the casting roller. The speed difference is different, and the thickness of the produced synthetic paper is also different, forming a unidirectional tension between the meniscus extruded by the die head and the cold roller, The tape casting method can produce synthetic paper of various thicknesses. However, the molecular chain distribution in synthetic paper is unidirectional, so the longitudinal, transverse and physical properties of synthetic paper products are quite different, which is a major disadvantage of cast synthetic paper. The specific gravity of tape casting method is about 1g/cm3, which is mainly used for printing. Like the calendering method, PP is also the base material of the cast synthetic paper. The deformation of the product is slightly larger, but the rigidity and toughness are better

3. Film blowing method

the material used in the production of synthetic paper by film blowing method is HDPE, which is different from PP substrate by calendering and tape casting method. In foreign countries, three-layer coextrusion equipment is mostly used in the production of synthetic paper by film blowing method, and internal cooling device, bubble film diameter, bubble film thickness detection and closed-loop control system are applied to ensure the uniformity of thickness of synthetic paper. The film blowing process realizes vertical and partial horizontal stretching, and the process equipment is relatively simple. German Alpine company first introduced the single-layer film blowing method to produce synthetic paper, using HDPE and masterbatch as raw materials

4. Biaxial stretching method

Formosa Plastics Co., Ltd. has introduced "biaxial stretching pearlescent paper" in recent years. Its base material is also pp. the mixing of raw materials for biaxial stretching method is basically the same as calendering and tape casting methods, but the equipment used is a biaxial stretching machine. In the biaxial stretching process, the vertical and horizontal distribution of the molecular chain of the plastic is relatively consistent, so the vertical and horizontal physical and mechanical properties of synthetic paper are basically the same. In the biaxial stretching process, some small gaps will be formed between the base plastic and the filler CaCO3, thus reducing the proportion and cost of synthetic paper. Due to the refraction effect of these small gaps on light, the synthetic paper produced has a good appearance and has been widely used in packaging, printing, advertising and other fields. Although the equipment of biaxial stretching synthetic paper is expensive, and the process and formula technology are also complex, its wide application is still limited. However, its products are widely used, and it will be the mainstream of synthetic paper development. It is still a cutting-edge packaging processing technology in the international packaging industry

5. Other production processes of synthetic paper

DuPont has successfully developed the production process of "non-woven paper". DuPont is one of the largest non-woven production companies. DuPont extends its production process of non-woven fabrics to the production process of synthetic paper, even though the base material of synthetic paper is polypropylene, which is melted, spun, formed, extruded, and finally produced into "non-woven synthetic paper". Non woven synthetic paper is woven with plastic fibers, so it has high capillary effect, more paper characteristics, light weight, strong permeability, good physical and mechanical properties, good coloring strength, low deformation. In addition to the application scope of general synthetic paper, it can also be widely used in furniture packaging, decoration and other industries. But: non woven synthetic paper "The price of is quite expensive, the production process and equipment are very complex, and the cost is high, which limits its wide promotion and application.

III. equipment characteristics of biaxial tensile synthetic paper

the width of biaxial tensile synthetic paper is currently more than 4 meters, and the maximum range is more than 8 meters. The production line speed is high, and the line speed of some varieties can be more than 300 meters. The whole line has a high degree of automation, and the temperature, speed, pressure, tension and thickness in the production process Degree control and other control systems are all centralized digital control

the equipment investment of biaxial tensile synthetic paper is large, but the products produced by this method are widely used, and a variety of products can be developed according to different uses to adapt to the printing or packaging field

the equipment for producing biaxial tensile synthetic paper is basically modified on the basis of BOPP equipment to adapt to the production of synthetic paper. In order to fully reflect the plastic characteristics of synthetic paper and the printing characteristics of paper, and produce synthetic paper with better performance, the performance requirements of the equipment will be higher

IV. material characteristics

biaxial tensile synthetic paper generally has a three-layer structure, and different material properties can be selected to meet different needs and application fields

surface materials need to meet people's sensory requirements for traditional paper, as well as various printing requirements, requiring high ink absorption performance

the surface material can also be adjusted according to the different use requirements of different customers to meet the special requirements of synthetic paper in different application fields, and more fully reflect the advantages of synthetic paper and different fiber paper. Such as developing heat sealable synthetic paper, in mold label paper, etc

by adding functional masterbatch, the core material can reduce its density, reduce the cost, or greatly improve the strength to adapt to special application fields. It can also add anti-aging agent to prolong the service life and reduce the use cost of customers

replacing paper with plastic is the development goal of synthetic paper, improving quality is the key, and reducing cost is the foundation

v. application of synthetic paper

because PP synthetic paper has the characteristics of both plastic and paper, it is widely used in many aspects, mainly in the following three aspects:

1. High quality printing. Such as posters, pictorials, pictures, maps, calendars, books, etc. Especially in water-resistant printing newspapers and periodicals, advertisements outside the factory, etc., it is more organized

2. Packaging purpose. Such as handbags, packaging boxes, drug packaging, cosmetics packaging, food packaging, industrial product packaging, etc

3. Special purpose. Such as film labels, pressure-sensitive labels, thermal labels, paper for banknotes, color image paper, tracing drawings for CAD, recording paper for industrial computers and instruments, express envelopes, clocks, plates, paper fans, umbrellas, paper hats for tourism and other tourism promotional products

VI. surface modification of synthetic paper and plastic film

the above synthetic paper is the base paper off the production line without any treatment, and its basic performance is mainly the surface or plastic property. Synthetic paper and plastic film materials are increasingly used in industry and real life. However, many polymers have poor surface properties, poor hydrophilicity, dyeability, and biocompatibility, which limit their application in some fields. The polymer surface modification technology can make the polymer obtain the surface characteristics different from the bulk performance, while maintaining its own performance unchanged. Therefore, the polymer surface modification has attracted more and more attention. In order to better adapt to the application of different fields, the surface treatment technology of synthetic paper has put forward more professional and higher requirements

our company has been committed to the surface treatment, application and development of synthetic paper and plastic film for many years. At present, we can modify the surface of most plastic films to make them a new multifunctional plastic film material that is easy to bond, write and print. At present, the most direct application fields of this product are: printing industry and packaging industry; And has completed the industrial production of two series of transparent film, opaque film and synthetic paper

synthetic paper is a plasticized material, which is congenital from natural paper