Method for preparing pulp for making natural-color packaging paperboards by using corn straw raw material

A technology of corn stalks and packaging cardboard, applied in the direction of non-woody plant/crop pulp, fiber raw materials, raw material separation, etc., can solve the problems that are not suitable for large-scale application, cannot be used in large-scale production, and are not conducive to large-scale application. Achieve the effect of realizing large-scale comprehensive utilization, realizing clean comprehensive utilization, and reducing chemical consumption

A technology of corn stalks and packaging cardboard, applied in the direction of non-woody plant/crop pulp, fiber raw materials, raw material separation, etc., can solve the problems that are not suitable for large-scale application, cannot be used in large-scale production, and are not conducive to large-scale application. Achieve the effect of realizing large-scale comprehensive utilization, realizing clean comprehensive utilization, and reducing chemical consumption

CN109629282AInactive Publication Date: 2019-04-16INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] After the corn stalks cut and packed by the combine harvester are unpacked, they are sent to the grass washing machine by the belt conveyor for washing to remove impurities such as sediment. The press is used for extrusion and concentration, the extrusion compression ratio is 5:1, and the extruded material is sent to a swinging sieve with a sieve diameter of Φ5mm by a belt conveyor for screening, and the powder or granular leaves and pith cores are separated Components are used for the preparation of feed and bio-organic fertilizer, and part of the straw raw material on the sieve is sent to the silo by the belt conveyor. The material in the silo is sent to the mixing screw through the belt conveyor, and after adding 1.5% NaOH for mixing, it is sent to the steaming bin for pre-steaming, the temperature is 98 ° C, and the time is 10 minutes; after steaming, the material is sent to the twin-screw The extruder is extruded, and 4.0% NaOH is added to the rear of the twin-scre...

Embodiment 2

[0045] After the corn stalks cut and packed by the combine harvester are unpacked, they are sent to the grass washing machine by the belt conveyor for washing to remove impurities such as sediment. The press is used for extrusion and concentration, and the extrusion compression ratio is 6:1. The extruded material is then sent to a swinging sieve with a sieve diameter of Φ4mm by a belt conveyor for screening, and the powder or granular leaves and pith cores are separated. Components are used for the preparation of feed and bio-organic fertilizer, and part of the straw raw material on the sieve is sent to the silo by the belt conveyor. The material in the silo is sent to the mixing screw through the belt conveyor, and after adding 2.0%wt NaOH to mix evenly, it is sent to the steaming bin for pre-steaming at a temperature of 95°C for 15 minutes; after steaming, the material is sent to the double The screw extruder is extruded, and 4.0%wt NaOH is added to the rear of the twin-scre...

Embodiment 3

[0047] After the corn stalks cut and packed by the combine harvester are unpacked, they are sent to the grass washing machine by the belt conveyor for washing to remove impurities such as sediment. The press is used for extrusion and concentration, the extrusion compression ratio is 5:1, and the extruded material is sent to a swinging sieve with a sieve diameter of Φ5mm by a belt conveyor for screening, and the powder or granular leaves and pith cores are separated Components are used for the preparation of feed and bio-organic fertilizer, and part of the straw raw material on the sieve is sent to the silo by the belt conveyor. The material in the silo is sent to the mixing screw through the belt conveyor, after adding 1.8% NaOH and mixing, it is sent to the steaming bin for pre-steaming, the temperature is 95 ° C, and the time is 10 minutes; after steaming, the material is sent to the twin-screw The extruder is extruded, and 4.0% NaOH is added to the rear of the twin-screw ex...

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Abstract

The invention relates to a method for preparing pulp for making natural-color packaging paperboards by using a corn straw raw material. The corn straw raw material is pretreated to separate most leaves and piths of corn straw and then is pulped by adopting a chemical mechanical method, and prepared paper pulp can replace waste paper pulp to be used for making corrugated raw paper or cardboard paper and other natural-color packaging paperboards. The method is characterized in that the structural characteristics of different components such as leaves, piths and straw skin in the corn straw raw material are fully utilized, the leaves and piths with smaller fiber contents are turned into powder or granules and the straw with higher fiber content is turned into dense sheets in the pretreatmentprocess, and then the extruded powder or granular leaves and piths are separated through screening for preparation of fodders or bio-organic fertilizers; the straw skin raw material without leaves andpiths is pulped by adopting the chemical mechanical method, and the organic waste generated in the preparation and pulping process can be used for preparing the fodders or bio-organic fertilizers.

Description

technical field [0001] The invention belongs to the field of high-efficiency utilization of agricultural stalks, and in particular relates to a method for preparing natural-color packaging cardboard compounding pulp by using corn stalks as raw materials. Background technique [0002] my country is a big corn planting country, and a large amount of corn stalks are produced every year. In 2016, my country's corn production was 219.6 million tons. According to the ratio of 1:1.6 of corn seeds and corn stalks produced by a plant of corn, the corn stalks produced reached more than 350 million tons. At present, only a small amount of such a huge amount of corn stalks is used as feed, biomass fuel or directly returned to the field. Waste, and a large amount of dense smog produced not only pollutes the environment, but also easily causes fires and traffic accidents, seriously threatening the safety of people's lives and property. On the other hand, there is a serious shortage of p...

Claims

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Application Information

Patent Timeline
16 Apr 2019
Publication
CN109629282A
IPC
D21B1/02; D21B1/06; D21C1/02; D21C1/06; D21C9/02; D21H11/12
CPC
D21B1/023; D21B1/06; D21B1/063; D21C1/02; D21C1/06; D21C9/02; D21H11/12
Inventors
房桂干; 邓拥军