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Easy-to-tear polypropylene packing bag and manufacturing method thereof

A polypropylene and packaging bag technology, applied in the field of plastic packaging, can solve the problems of reducing the mechanical and physical properties of the film, making it difficult to tear out the crack, and poor tearing effect, and achieve good surface properties, easy to tear, tear The effect of crack strength reduction

Inactive Publication Date: 2009-03-04
ZHEJIANG GOLDSTONE PACKING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The disadvantage of the packaging bag directly made of non-directional stretched polypropylene film as the heat-sealing layer is that the tearing effect is poor, and it is difficult to tear out the tear in a certain direction, let alone in a straight line.
[0004] The packaging bag made of biaxially stretched polypropylene film as the heat-sealing layer has the disadvantage of high cost, and the mechanical and physical properties of the film are reduced due to the biaxial stretching

Method used

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  • Easy-to-tear polypropylene packing bag and manufacturing method thereof
  • Easy-to-tear polypropylene packing bag and manufacturing method thereof
  • Easy-to-tear polypropylene packing bag and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (embodiment 1, easy tear type polypropylene packaging bag)

[0037] figure 1 It is a structural schematic diagram of the first structure of the product of the present invention, showing a specific embodiment of the product of the present invention.

[0038] See figure 1, this embodiment is an easy-to-tear polypropylene packaging bag, the packaging bag is a two-layer composite layer structure, from the inside to the outside are the heat-sealing layer 1 and the printing layer 2, the heat-sealing layer 1 is a one-way Directional stretched polypropylene film layer. The thickness of the heat-sealing layer 1 is 70 μm; the elongation at break of the heat-sealing layer 1 in the stretching direction is 30%, and the elongation at break in the unstretched direction is 490%. The stretching direction of the heat-sealing layer 1 is parallel to the bag opening direction.

[0039] The printing layer 2 in this embodiment is a polyethylene terephthalate layer, and in practice, a biax...

Embodiment 2

[0040] (embodiment 2, easy tear type polypropylene packaging bag)

[0041] figure 2 It is a structural schematic diagram of the second structure of the product of the present invention, showing another specific embodiment of the product of the present invention.

[0042] See figure 2 , this embodiment is an easy-to-tear polypropylene packaging bag. When the packaging bag is a three-layer composite structure, the heat-sealing layer 1, the barrier layer 3, and the printing layer 2 are in sequence from the inside to the outside; The barrier layer 3 is an aluminum foil layer, and the printing layer 2 is a polyethylene terephthalate layer; in practice, a biaxially stretched polypropylene layer or a paper layer can also be used as the printing layer 2 . The thickness of the heat-sealing layer 1 is 100 μm; the elongation at break of the heat-sealing layer 1 in the stretching direction is 50%, and the elongation at break in the unstretched direction is 450%. The stretching direct...

Embodiment 3

[0043] (embodiment 3, easy tear type polypropylene packaging bag)

[0044] image 3 It is a structural schematic diagram of the third structure of the product of the present invention, showing the third embodiment of the product of the present invention.

[0045] See image 3 , this embodiment is an easy-to-tear polypropylene packaging bag. When the packaging bag is a four-layer composite structure, heat-sealing layer 1, barrier layer 3, reinforcing layer 4 and printing layer 2 are sequentially arranged from the inside to the outside, or Heat-sealing layer 1, reinforcing layer 4, barrier layer 3 and printing layer 2; the reinforcing layer 4 is a nylon layer, the barrier layer 3 is an aluminum foil layer, and the printing layer 2 is polyethylene terephthalate layer, in practice, a biaxially oriented polypropylene layer or a paper layer can also be used as the printing layer 2 . The thickness of the heat-sealing layer 1 is 40 μm; the elongation at break of the heat-sealing la...

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Abstract

The invention discloses an easy-to-tear type polypropylene packing bag and a manufacturing method thereof. The packing bag comprises a heat-seal layer which is made of polypropylene film through one-way orientation stretching. The manufacturing method comprises the following steps: firstly, polypropylene film which meets sanitary requirements is taken as the material, and one-way orientation stretching is performed to the polypropylene film after the polypropylene film is heated to 100 to 600 DEG C, and the stretch ratio is 1.1 to 5; secondly, temperature reduction treatment performed to the film which is processed through orientation stretching, concretely the temperature of the film which is processed through orientation stretching is quenched to the environment temperature; thirdly, corona treatment is performed to the film which is stretched, to ensure the surface tension of the film to be larger than 38 dynes, thereby a shaped easy-to-tear type polypropylene packing film is obtained, and is rolled; fourthly, the film is superposed on a required additional layer to obtain the wall layer of the packing bag, namely, a composite layer structure; and fifthly, the wall layer is folded and a plurality sides are sealed to form a bag shape with an opening to obtain a finished packing bag. When the packing bag is torn along the stretching direction of the heat-seal layer, the opening is in a straight-line shape.

Description

technical field [0001] The invention belongs to the technical field of plastic packaging, and in particular relates to an easy-to-tear polypropylene packaging bag and a manufacturing method thereof. Background technique [0002] Traditional polypropylene packaging bags are mostly made of non-directionally stretched polypropylene film as the heat-sealing layer, or biaxially stretched polypropylene film as the raw material. [0003] The disadvantage of the packaging bag directly made of non-directionally stretched polypropylene film as the heat-sealing layer is that the tearing effect is poor, and it is difficult to tear out the tear in a certain direction, let alone in a straight line. [0004] The disadvantage of the packaging bag made of biaxially stretched polypropylene film as the heat-sealing layer is that the cost is high, and the mechanical and physical properties of the film are reduced due to the biaxial stretching. Contents of the invention [0005] The object of...

Claims

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Application Information

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IPC IPC(8): B65D30/02B65D30/10B65D33/16B29C55/04B29C35/16B29C71/00B29C65/00B31B1/26B29K23/00B29L22/00
Inventor 张文锋孙国锦
Owner ZHEJIANG GOLDSTONE PACKING
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