Multi-layer co-extrusion high-smoothness BOPP (biaxially-oriented polypropylene) film

Abstract

The utility model discloses a multi-layer co-extrusion high-smoothness BOPP (biaxially-oriented polypropylene) film, and belongs to the technical field of BOPP films. Comprising a core layer, an anti-friction smooth layer and a printing smooth layer, and the core layer is made of a polypropylene material; the anti-friction smooth layer is arranged on one side of the core layer in a co-extrusion mode through a casting piece roller, and the anti-friction smooth layer is a stearic acid smooth layer; the printing smooth layer is arranged on the other side of the core layer in a co-extrusion mode through a casting piece roller, and the printing smooth layer is an oleamide layer or an erucyl amide layer. According to the multi-layer co-extrusion high-smoothness BOPP thin film disclosed by the utility model, the anti-friction smooth layer is adopted as the packaging film covering surface, so that the multi-layer co-extrusion high-smoothness BOPP thin film has excellent hot smooth performance, and smooth failure caused by overheating cannot be caused; in addition, the outer surface of the film adopts the printing smooth layer, the corona treatment value influence is small, and the printing effect is good.

Description

Technical Field

[0001] The utility model specifically relates to a multi-layer co-extruded high-smooth BOPP film, belonging to the technical field of BOPP films. Background Art

[0002] Heat-sealable BOPP film is widely used in the field of printed packaging. With the high-speed packaging, BOPP heat-sealable film is also required to have high slip performance. The existing heat-sealable film generally has a large friction coefficient, which affects the entire packaging speed. For this reason, Chinese Patent Publication No.: CN204472009U discloses a high-slip heat-sealable BOPP film, including a core layer, a heat-sealable layer is compounded on the upper and lower sides of the core layer, and an erucamide layer is compounded on the outside of the heat-sealable layer. The utility model reduces the friction coefficient, reduces the COF to below 0.2, increases the slip performance, and improves the production efficiency of packaging. Although the erucamide layer can improve the slip performance, the erucamide film is prone to generate heat in some high-speed packaging situations, resulting in the failure of the amide lubricant and poor heat slip performance. Utility Model Content

[0003] In order to solve the above problems, the utility model proposes a multi-layer co-extruded high-smooth BOPP film. The packaging coating surface adopts an anti-friction smooth layer, which has excellent thermal smooth performance and will not cause overheating and lead to smooth failure. In addition, the outer surface of the film adopts a printed smooth layer, which has little influence on the corona treatment value and has a good printing effect.

[0004] The multi-layer co-extruded high-smooth BOPP film of the utility model comprises:

[0005] A core layer, wherein the core layer is made of polypropylene resin;

[0006] An anti-friction and slippery layer, wherein the anti-friction and slippery layer is co-extruded on one side of the core layer by a casting roller, and the anti-friction and slippery layer is a stearic acid-based slippery layer;

[0007] The printing slippery layer is co-extruded on the other side of the core layer by a casting roller, and the printing slippery layer is an oleamide layer or an erucamide layer.

[0008] During production, three extruders are used to melt the raw materials. The three extruders melt the raw materials of the core layer, the anti-friction slippery layer and the printed slippery layer respectively. The melted raw materials pass through the filter and then enter the die through the three-layer co-extrusion feed block; the melt is evenly distributed in the die as three layers flowing out, and the outflowing melt is cast on the casting roller to form a whole, and then two vertical stretchings are performed to form a BOPP film.

[0009] Furthermore, the stearic acid lubricating layer comprises a first polypropylene carrier co-extruded on one side of the core layer by a casting roller, and a stearic acid lubricating material is mixed and melted on the inside of the first polypropylene carrier; the oleamide layer and the erucamide layer both comprise a second polypropylene carrier, and the second polypropylene carrier is co-extruded on the other side of the core layer by a casting roller, and the oleamide layer also comprises an oleamide filler, and the oleamide filler is mixed and melted on the inside of the second polypropylene carrier; the erucamide layer also comprises an erucamide filler, and the erucamide filler is mixed and melted on the inside of the second polypropylene carrier, the first polypropylene carrier can carry the stearic acid lubricating material, and the second polypropylene carrier can carry the oleamide filler or the erucamide filler; the first polypropylene carrier and the second polypropylene carrier can be integrated with the core layer by coextrusion; the combination of stearic acid lubricating material, oleamide filler or erucamide filler can solve the problem of lubrication failure caused by overheating of the friction surface of the film, and can solve the problem of poor surface printing quality.

[0010] Furthermore, the core layer has a thickness of 10 to 30 μm, the anti-friction slippery layer has a thickness of 2 to 6 μm, and the printed slippery layer has a thickness of 2 to 6 μm.

[0011] Furthermore, a printing surface is provided on the outer surface of the printed slippery layer. The printed slippery layer uses oleic acid amide filler or erucic acid amide filler, which can not only ensure a high slippery effect, but also has little influence on the corona treatment value, has a good printing effect, and the printing surface can be well attached to the outer surface of the printed slippery layer.

[0012] Compared with the prior art, the multi-layer co-extruded high-smooth BOPP film of the utility model adopts an anti-friction and smooth layer for the force-bearing friction surface of the film when the film is printed and packaged at a high speed, and the stearic acid-based smooth material is used to make the film have excellent thermal and smooth performance, and will not cause overheating and smooth failure; in addition, a printed smooth layer is used on the outer surface of the film, and oleic acid amide filler or erucic acid amide filler is used to solve the problem of printing white spots caused by the large corona effect of the anti-friction and smooth layer; the film has little effect on the corona treatment value and has a good printing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the multi-layer co-extruded high-smooth BOPP film of the utility model.

[0014] Figure 2 It is a schematic diagram of the internal structure of an embodiment of the multi-layer co-extruded high-smooth BOPP film of the utility model.

[0015] Figure 3 This is a schematic diagram of the structure of another embodiment of the multi-layer co-extruded high-smooth BOPP film of the utility model.

[0016] Figure 4It is a schematic diagram of the co-extrusion structure of each structural layer of the BOPP film of the utility model.

[0017] Figure numerals: 1. core layer, 2. anti-friction slip layer, 3. printing slip layer, 4. first polypropylene carrier, 5. stearic acid slip material, 6. second polypropylene carrier, 7. oleamide filler, 8. erucamide filler, 9. casting roller. DETAILED DESCRIPTION

[0018] Example:

[0019] like Figures 1 to 4 The multi-layer co-extruded high-smooth BOPP film shown includes:

[0020] A core layer 1, wherein the core layer 1 is made of polypropylene resin;

[0021] An anti-friction and slippery layer 2, wherein the anti-friction and slippery layer 2 is co-extruded on one side of the core layer 1 by a casting roller 9, and the anti-friction and slippery layer 2 is a stearic acid slippery layer;

[0022] The printed slippery layer 3 is co-extruded on the other side of the core layer 1 by a casting roller 9, and the printed slippery layer 3 is an oleamide layer or an erucamide layer.

[0023] During production, three extruders are used to melt the raw materials. The three extruders melt the raw materials of the core layer 1, the anti-friction slippery layer 2 and the printed slippery layer 3 respectively. The melted raw materials pass through a filter and then enter the die through a three-layer co-extrusion feed block; the melt is evenly distributed in the die as three layers flowing out, and the outflowing melt is cast on the casting roller 9 to form a whole, and then two vertical stretchings are performed to form a BOPP film.

[0024] The stearic acid slippery layer comprises a first polypropylene carrier 4 co-extruded on one side of the core layer 1 by a casting roller 9, and a stearic acid slippery material 5 is mixed and melted inside the first polypropylene carrier 4; the oleamide layer and the erucamide layer both comprise a second polypropylene carrier 6, which is co-extruded on the other side of the core layer 1 by a casting roller 9, and the oleamide layer further comprises an oleamide filler 7, which is mixed and melted inside the second polypropylene carrier 6; the erucamide layer further comprises an erucamide filler 8, which is mixed and melted inside the second polypropylene carrier 6, the first polypropylene carrier 4 can carry the stearic acid slippery material 5, and the second polypropylene carrier 6 can carry the oleamide filler 7 or the erucamide filler 8; the first polypropylene carrier 4 and the second polypropylene carrier 6 can be integrated with the core layer 1 by co-extrusion; the combination of the stearic acid slippery material 5, the oleamide filler 7 or the erucamide filler 8 can solve the problem of slip failure caused by overheating of the friction surface of the film, and can solve the problem of poor surface printing quality.

[0025] The core layer 1 has a thickness of 10 to 30 μm, the anti-friction slippery layer 2 has a thickness of 2 to 6 μm, and the printed slippery layer 3 has a thickness of 2 to 6 μm.

[0026] The outer surface of the printed slippery layer 3 is provided with a printing surface. The printed slippery layer 3 uses oleamide filler 7 or erucamide filler 8, which can not only ensure a high slippery effect, but also have little influence on the corona treatment value, have a good printing effect, and the printing surface can be well attached to the outer surface of the printed slippery layer 3.

[0027] The above embodiments are only preferred implementations of the present invention, so any equivalent changes or modifications made according to the structures, features and principles described in the scope of application of the present invention are included in the scope of application of the present invention.

Claims

1. A multi-layer co-extruded high-smooth BOPP film, characterized by: include: A core layer, wherein the core layer is made of polypropylene material; An anti-friction and slippery layer, wherein the anti-friction and slippery layer is co-extruded on one side of the core layer by a casting roller, and the anti-friction and slippery layer is a stearic acid-based slippery layer; The printing slippery layer is co-extruded on the other side of the core layer by a casting roller, and the printing slippery layer is an oleamide layer or an erucamide layer.

2. The multi-layer co-extruded high-smooth BOPP film according to claim 1, characterized in that: The stearic acid lubricating layer includes a first polypropylene carrier co-extruded on one side of the core layer through a casting roller, and the first polypropylene carrier has a stearic acid lubricating material mixed and melted on the inside; the oleamide layer and the erucamide layer both include a second polypropylene carrier, which is co-extruded on the other side of the core layer through a casting roller, and the oleamide layer also includes an oleamide filler, which is mixed and melted on the inside of the second polypropylene carrier; the erucamide layer also includes an erucamide filler, which is mixed and melted on the inside of the second polypropylene carrier.

3. The multi-layer co-extruded high-smooth BOPP film according to claim 1, characterized in that: The thickness of the core layer is 10 to 30 μm, the thickness of the anti-friction slippery layer is 2 to 6 μm, and the thickness of the printed slippery layer is 2 to 6 μm.

4. The multi-layer co-extruded high-smooth BOPP film according to claim 1, characterized in that: The outer surface of the printing smooth layer is provided with a printing surface.

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