CN201217285Y - Biaxially oriented polypropylene pre-coated film - Google Patents

Abstract

Disclosed is a dual-direction tensile polypropylene precoatingfiltration, which is applied to the printing film covering field; the polypropylene precoatingfiltration comprises a substrate, a middle layer and a hot melting glue layer; the polypropylene precoatingfiltration is characterized in that: the substrate is the dual-direction tensile polypropylene precoatingfiltration; the middle layer is the polyethyleneimine (PEI); and the hot melting glue layer is the EVA hot melting glue. The middle layer and the hot melting layer are all sequentially coated and combined on a surface of the substrate. The substrate has a thickness of 12 to 20 microns, the middle layer has a thickness of 0.01 to 0.03 microns; and the hot melting glue layer has a thickness of 10 to 40 microns. The dual-direction tensile polypropylene precoatingfiltration has the beneficial effects that: the precoatingfiltration is cheap and fine, the producing is easy, the lightness is high, the specifications are more (divided into light and semigloss, single-surface corona precoatingfiltration and dual-surface corona precoatingfiltration), the application range is wide, and the exquisite degree of the printing production is improved, so as to execute the covering film in the field of big paper printing products. The dual-direction tensile polypropylene precoatingfiltration has the advantages of stable quality, environment protecting, secure, convenient, energy saving and high-efficiency, so as to satisfy the users requirements for the covering film.

Description

Biaxially oriented polypropylene pre-coated film

technical field

The utility model relates to the technical field of printing film coating, in particular to a pre-coating film which is an important material of the film coating, and is a pre-coating film manufactured by extrusion composite technology.

Background technique

Printed matter lamination is an important means of post-press processing, which determines the final value of printed products. The lamination process of printed matter refers to covering the paper printed matter with a plastic film, using an adhesive in the middle, and after heat and pressure treatment, the plastic film and paper are bonded together to form a paper/plastic composite. One of the most advanced surface decoration processing technology. It protects and decorates printed matter, and is widely used in the field of packaging and printing, such as the surface processing of book covers, brochures, maps, advertising gift bags, and high-end packaging boxes. The coating can be divided into two types: coating film and pre-coating film.

That is, film coating technology is a post-press lamination process for printed matter and packaging that emerged in the 1960s. However, this technology directly uses benzene-containing solvents in the coating process, which brings three major disadvantages that cannot be overcome due to its own process:

(1) Environmental protection issues: due to the volatilization and overflow of the toxic substance benzene, it causes air pollution and brings great harm to the health of producers and users; at the same time, the harmful substances remaining in the film are harmful to the health of consumers. adverse effects.

(2) Quality problems: Since benzene, a volatile substance, continues to overflow after the film coating process, it is easy to form air bubbles between the film and the paper, making the surface of the printed product foggy, affecting the smoothness, clarity and color vividness of the printed product ; Sometimes due to insufficient bonding strength, it even causes cracking, wrinkling and stripping. In addition, that is, the production equipment of the coating film has a low degree of automation, which reduces the yield of the coating film.

(3) Safety issues: Since the solution contains benzene, a volatile organic solvent, it is easy to form a flammable and explosive gas atmosphere around the liquid tank, and the plastic substrate used generates static electricity during operation, causing fire hazards. There have been several accidents like this, ranging from shutdowns to stop production, to machine burns, plant collapses, and casualties.

Pre-coating film coating technology is a sustainable environmental protection technology. Pre-coating film coating technology can also be called environmentally friendly technology or clean technology, which realizes environmental protection, health protection and safe production. During the production and use of pre-coated film, no volatilization and pollution of toxic gases will occur. Therefore, the working environment can be effectively improved, and fire hazards in production sites and product storage can be eliminated; pre-coated film products can be widely used because there are no harmful residual substances in them. It does not pose a potential threat to consumers on the packaging of books (especially student textbooks), food, tobacco, alcohol, and drugs; at the same time, it saves the process of adhesive preparation, coating, and drying. It can be completed in a few seconds, it will not pollute the environment, there is no fire hazard, and there is no need to clean the gluing equipment, etc., and it can achieve high-speed, high-efficiency, high-quality lamination; the pre-coated film improves the color saturation and color of the printed matter. Clarity, significantly increase its artistic effect, and protect the printed matter, making it water-resistant, moisture-resistant, light-resistant, anti-pollution, anti-chemical corrosion, prolong the service life, greatly improve the durability, collection and ornamental value of the printed matter, and enhance the Commercial competitiveness and added value of products.

The pre-coating film structure is different, the base material is different and the hot-melt adhesive layer is different, the performance of the pre-coating film product will be very different, and the effect of the product after lamination will also be very different, such as color saturation, brightness, Tensile strength, width, flatness, etc.

Utility model content

The purpose of this utility model is: to provide a biaxially oriented polypropylene (BOPP) pre-coating film, which can improve the exquisiteness of printed products and stabilize product quality. It is not only environmentally friendly, safe, convenient, energy-saving and efficient, but also can satisfy most customers. The products after lamination are required to have high color saturation and high brightness, and this kind of pre-coating film also has high quality and low price, easy processing, and many varieties and specifications (can be divided into bright and matte, single-sided corona and double-sided) Surface corona pre-coating film), wide range of applications. Since no organic solvent is used, the shortcoming of the coating film is overcome.

The technical scheme adopted by the utility model is: a biaxially oriented polypropylene (BOPP) pre-coating film, including a base material, an intermediate layer and a hot-melt adhesive layer, and is characterized in that: one surface of the base material has an intermediate layer and a hot-melt adhesive layer in sequence. Adhesive layer, base material, intermediate layer and hot melt adhesive layer have the same width. The substrate is biaxially oriented polypropylene film (BOPP), the middle layer is polyethyleneimine (PEI), and the hot-melt adhesive layer is EVA hot-melt adhesive. The middle layer and the hot-melt adhesive layer are uniformly coated and compounded on one surface of the base material in sequence. The thickness of the substrate is between 12-20 microns, the thickness of the intermediate layer is between 0.01-0.03 microns (the coating amount is 0.009-0.011g/m ² ), and the thickness of the hot melt adhesive layer is between 10-40 microns between.

A better technical solution is: the thickness of the substrate is between 12-18 microns, the thickness of the intermediate layer is between 0.01-0.02 microns (the coating amount is 0.009-0.01g/m ² ), the thickness of the hot melt adhesive layer is Between 10-30 microns.

Using the composite production line composed of extruder and composite equipment, the intermediate layer is coated on one surface of the substrate, and finally the hot melt adhesive layer is composited on the intermediate layer to produce biaxially oriented polypropylene (BOPP) pre-coated film. Different products can be obtained by properly combining the thickness of the base material and the EVA hot melt adhesive layer. The above-mentioned extruder, compounding equipment and compounding process are well known to those skilled in the art.

EVA hot melt adhesive is a solid meltable polymer that does not require solvents and does not contain 100% moisture; it is solid at room temperature, and when heated and melted to a certain temperature, it becomes a fluid and viscous liquid. The melted EVA hot melt adhesive is light yellow or colorless. EVA hot melt adhesives are composed of basic resins, tackifiers, viscosity modifiers and antioxidants. At present, coating-grade EVA hot-melt adhesive products mainly rely on imports, and there are no suitable grades of products produced in China.

Polyethyleneimine (PEI) molecular formula is: [-CH ₂ CH ₂ NH-]n, Shanghai DIC Ink Co., Ltd. has product supply, and the utility model adopts the product imported from the United States.

Beneficial effects of the utility model: biaxially oriented polypropylene (BOPP) pre-coated film, with biaxially oriented polypropylene (BOPP) film as the base material, and EVA hot-melt adhesive as the pre-coated film of the hot-melt adhesive layer, has a good quality Cheap, easy to process, high brightness, many varieties and specifications (can be divided into glossy and matte, single-sided corona and double-sided corona pre-coating films), and wide application fields, which improves the exquisiteness of printed products. Lamination can be applied to the surface of most paper prints. Biaxially oriented polypropylene (BOPP) pre-coated film has stable quality, and has the advantages of environmental protection, safety, convenience, energy saving and high efficiency, and can meet most customers' requirements for film-coated products. Since no organic solvent is used, the shortcoming of the coating film is overcome. Its products will be more widely used in the field of paper printing lamination.

Description of drawings

Fig. 1 is a cross-sectional schematic diagram of a biaxially oriented polypropylene (BOPP) precoat film.

In the figure, 1. Substrate, 2. Intermediate layer, 3. Hot melt adhesive layer.

Detailed ways

Embodiment 1: Take a biaxially oriented polypropylene (BOPP) precoat film with a width of 1770 mm as an example to describe in detail.

See Figure 1. Biaxially oriented polypropylene (BOPP) pre-coated film width is 1770 mm. The substrate 1, the middle layer 2 and the hot melt adhesive layer 3 have the same width. The biaxially oriented polypropylene (BOPP) pre-coating film has 3 layers, the first layer is the substrate 1, the second layer is the middle layer 2, and the third layer is the hot melt adhesive layer 3. The original substrate is a biaxially oriented polypropylene (BOPP) film with a width of 1795 mm. The middle layer 2 is polyethyleneimine (PEI), and the hot melt adhesive layer 3 is EVA hot melt adhesive. The middle layer 2 and the hot-melt adhesive layer 3 are evenly coated and compounded on one surface of the substrate 1 in sequence. After the composite hot-melt adhesive layer 3 passes through the trimming system, the edges on both sides are cut off by 25 mm in total. The final product will be larger than The width of the original base material is about 25mm narrower. At the edge of the width, the thickness deviation is ≤2 microns. The thickness of the substrate 1 is 12 microns, the thickness of the intermediate layer 2 is 0.015 microns, and the combined thickness of the hot melt adhesive layer 3 is 10 microns.

Claims (2)

1, a kind of Biaxially oriented polypropylene pre-coating film, comprise base material (1), intermediate layer (2) and hot melt adhesive layer (3), it is characterized in that: intermediate layer (2) and hot melt adhesive layer (3) are arranged on the surface of base material (1) successively, base material (1), intermediate layer (2) is identical with the width of hot melt adhesive layer (3), base material (1) is a bidirectional stretching polypropylene film, intermediate layer (2) is a polymine, hot melt adhesive layer (3) is the EVA PUR, the thickness of base material (1) is between the 12-20 micron, the thickness in intermediate layer (2) is between the 0.01-0.03 micron, and the compound thickness of hot melt adhesive layer (3) is between the 10-40 micron.

2, Biaxially oriented polypropylene pre-coating film according to claim 1, it is characterized in that: the thickness of described base material (1) is between the 12-18 micron, the thickness in intermediate layer (2) is between the 0.01-0.02 micron, and the thickness of hot melt adhesive layer (3) is between the 10-30 micron.

Images