Low melting point valve port bag and manufacturing method thereof

Abstract

The invention discloses a manufacturing method for a low melting point valve port bag. The low melting point valve port bag has the following indexes that the melting point is between 98 and 102 DEG C; the transverse tensile strength is between 23 and 25 MPa; the longitudinal tensile strength is between 24 and 27 MPa; the transverse elongation at break is between 750 and 820 percent; the longitudinal elongation at break is 730 to 760 percent; the upper and lower heat seal strength is between 38 and 45 N / 15mm; and the heat seal strength at four corners is between 38 to 45 N / 15mm. The packagingbag prepared by the technical scheme can be thrown into an internal mixer together with carbon black, cannot produce package garbage in use, and is an environment-friendly product; embossing processing is performed when a film is blown so as to facilitate opening; the overall anti-sliding effect of a bag body is good; the melting point of the low melting point valve port bag is between 98 and 102DEG C, and is stable; thermal deformation cannot occur after the carbon black is injected; and the port bag is automatically filled into a cuboid after being filled with materials, so that bags are stacked tidily. A valve port is perforated for exhausting, is breathable and does not leak material; and the valve port bag has good compatibility with rubber and can be quickly fused into the rubber without affecting the performance of the rubber.

Description

technical field [0001] The invention relates to the technical field of packaging bags, in particular to a low melting point valve bag and a manufacturing method thereof. Background technique [0002] With the requirements of environmental protection, carbon black is the main raw material in the rubber industry. Carbon black packaging needs to be packed in valve bags. Valve bags are a kind of packaging bags. When packaging carbon black materials, they are fed from the top or bottom valve port. , After being filled with materials, it is in a square shape, which has the advantages of neat and beautiful stacking, high packaging efficiency, convenient transportation, and low damage rate. [0003] However, the types of existing valve bags include kraft paper valve bags, woven bags, PE valve bags, etc. After such valve bags are filled with carbon black materials, when they are transported to the closed rubber mixer for feeding, the valve bags cannot be separated from the material. ...

AI Technical Summary

Problems solved by technology

[0006] 1. The production process is backward, the labor intensity is high, the output is low, and the quality is unstable

[0007] 2. The melting point of the valve bag with low melting point is not suitable. Since the temperature of the carbon black filling is 70-80°C, the valve bag will be thermally deformed after being filled with carbon black, and will be squeezed and deformed after stacking, resulting in collapse

[0008] 3. The physical strength is poor, and the heat sealing strength is not enough to easily cause material leakage

[0009] 3. When carbon black is filled, a large amount of gas enters the valve pocket, and the gas in the bag cannot be removed. It will be squeezed and deformed during transportation, which will easily cause collapse or bag breakage and material leakage.

[0010] 4. The anti-skid effect of the valve pocket is poor, and it is difficult to stack and cannot be stacked, which affects the transportation

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