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A kind of grain storage bag and preparation method thereof

A grain bag and gingham technology, applied in chemical instruments and methods, bags, sacks, etc., can solve the problems of reducing the effect of grain preservation, affecting the strength of packaging bags, hidden dangers of safety, etc. The effect of improving the preservation quality and prolonging the storage period

Active Publication Date: 2018-01-26
CHANGSHU GOLD SPRING CHEM FIBERS & KNITTINGS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent uses antibacterial powder coated in the middle of a double-layer paper bag. On the one hand, the paper bag is easy to absorb moisture and affects the strength of the packaging bag; It is difficult to discharge, which will reduce the freshness preservation effect of grain
[0007] To sum up, among the existing materials related to grain packaging bags, on the one hand, more composite films, film-plastic composites, film-non-woven composites, etc. are involved. Due to the extensive use of non-degradable petroleum-based plastic films, among them The potential toxicity of additive volatilization will cause safety hazards. On the other hand, multi-layer compounding or adding a large amount of chemical additives, the manufacturing process is complicated, and it is difficult to sell and promote in the market

Method used

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  • A kind of grain storage bag and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In step 101, polylactic acid slices are used to prepare the lower polylactic acid filament web.

[0038] Step 102, unwind the hemp fiber woven square cloth and lay it directly on the lower polylactic acid filament web, and the hemp fiber woven square cloth is prepared from jute fiber.

[0039] In step 103, polylactic acid slices are used to prepare the upper polylactic acid filament web.

[0040] Step 104, laying the upper layer polylactic acid filament web on the hemp fiber woven grid cloth, and placing the upper layer polylactic acid filament web, the hemp fiber woven grid cloth and the The three-layer fiber web composed of the lower polylactic acid filament web is sent as a whole to a three-roll mill for pre-reinforcement, wherein the roll surface temperature of the three-roll mill is 125-138°C, and the hot rolling and ironing time is 10-20s After exiting the three-roll rolling mill, the three-layer fiber web is wound to obtain a polylactic acid filament nonwoven fa...

Embodiment 2

[0045] Step 201, the melt index is 30-55g / 10min, the density is 1.24g / cm 3 , polylactic acid slices with a melting point of 165-170°C are first pre-crystallized at 30-40°C for 4-6h, then heated to 110°C at a rate of 10°C per hour, and then dried at 110°C for 6-8h , so that the water content of the polylactic acid slice reaches 0.035-0.045%.

[0046] In step 202, the polylactic acid slices that have been dried are fed, extruded by an extruder, and filtered, and then sent to a spinning box for spinning. The spinning temperature is controlled at 220-240° C., and the spinning speed is controlled as 4000-6000m / min, compressed air pressure is 0.3-0.5MPa, side blowing cooling temperature is 20-23°C, wind speed is 0.4-0.8 m / s, and the working air volume for air stretching is 0.75-1m 3 / min, the spinning frequency of the spinning device is 500-700Hz. After the spinning, it is sucked by the airflow of the suction bellows under the netting curtain and falls on the netting curtain. The s...

Embodiment 3

[0061] 1) Preparation of polylactic acid filament nonwoven fabric

[0062] (1) Preparation of lower polylactic acid filament web

[0063] a. Use a melt index of 30g / 10min and a density of 1.24g / cm 3 , polylactic acid chips with a melting point of 170°C;

[0064] b. Pre-crystallize the polylactic acid slices at 40°C for 4-6 hours, then raise the temperature to 110°C at a rate of 10°C per hour, and dry at 110°C for 6-8 hours, so that the water content of the polylactic acid slices reaches 0.035%;

[0065] c. Use a melt index of 55g / 10min and a density of 1.24g / cm 3 , polylactic acid slices with a melting point of 165°C, the polylactic acid slices are fed, extruded by an extruder and filtered, and then sent to the spinning box for spinning. The spinning temperature is controlled at 240°C, and the spinning speed is controlled at 6000m / min, the compressed air pressure is 0.5MPa, the side blowing cooling temperature is 23°C, the wind speed is 0.8m / s, and the working air volume ...

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Abstract

The invention discloses a grain storage bag and a preparation method thereof, and relates to the field of packaging. The grain storage bag is composed of polylactic acid fiber and jute fiber. The preparation method of the grain storage bag includes: using polylactic acid slices to prepare the lower polylactic acid filament web; unwinding the hemp fiber woven grid cloth and laying it directly on the lower polylactic acid filament web; using polylactic acid slices to prepare the upper layer The polylactic acid filament web is laid on the hemp fiber woven square cloth to form a three-layer web; the three-layer web is pre-reinforced to obtain a polylactic acid filament non-woven fabric; the polylactic acid filament is non-woven by ultrasonic method The spun cloth is compounded, cut into certain specifications, and then sewn and heat-sealed to become a grain storage bag. The grain storage bag provided by the present invention uses degradable polylactic acid fiber and jute fiber with a unique fiber cavity structure and ultrasonic method to carry out dot-like compounding, so that the grain storage bag can delay the deterioration of grain quality and prolong the grain storage period , the advantage of buffering bump damage during grain transportation.

Description

technical field [0001] The invention relates to the field of packaging, in particular to a grain storage bag and a preparation method thereof. Background technique [0002] As people pay more and more attention to food safety issues, small-package grains are becoming more and more popular. Due to the convenience of handling and short shelf life, 5KG-30KG grains are very popular in the market. At present, my country's grain packaging bags are mainly plastic woven bags and composite plastic bags, and there are also a small amount of non-woven packaging bags. Among them, plastic woven bags have high strength, good impact resistance, non-slip and not easy to deform, but poor performance in terms of insect resistance and moisture resistance. , there are shortcomings such as environmental pollution [Xue Zhicheng. Prospect Analysis of Grain Sales Packaging Bags [J]. Grain Circulation Technology, 2002, (3): 36-36.]; composite plastic bags are made of high barrier packaging materials ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D04H1/55D04H1/732D01D5/08D03D13/00D03D15/00B32B37/06B32B9/02B32B5/26B32B27/28B32B27/02B32B27/12B32B38/00B65D30/08D03D15/217
CPCD01D5/08D03D13/008D03D15/00D04H1/55D04H1/732B65D29/02B32B5/028B32B5/26B32B9/02B32B27/12B32B27/28B32B37/06B32B38/0008D10B2201/01B32B2305/38B32B2307/7145B32B2307/558B32B2307/728B32B2307/754B32B2307/51B32B2250/03B32B2250/20B32B2262/065B32B2439/70Y02A40/90Y02W90/10
Inventor 钱程
Owner CHANGSHU GOLD SPRING CHEM FIBERS & KNITTINGS
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