Method for preparing pulp by gramineous straw and use of obtained pulp

A straw and undergraduate technology, applied in the direction of non-woody plant/crop pulp, pulp bleaching, cellulose pulp post-treatment, etc., can solve problems such as complex process, achieve fiber length, good stiffness and fastness, and low energy consumption Effect

Inactive Publication Date: 2011-11-16
NANJING BIOFUNCTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent document CN1273204 discloses "Straw Fiber Liner Packaging Material and Production Process", which mainly introduces the method and process of producing liner by grinding straw into powder and compounding it with other materials, but it does not use the pulp properties after straw slitting, nor does it involve Decolorization and modification of pulp characteristics
Patent document CN1184161C discloses "Flame Retardant Environmentally Friendly Decorative Board and Its Preparation Method", which provides a kind of environmentally friendly decorative board and its preparation method, but the method is to add conventional flame retardants in the dry process, and then add Glutinous rice paste is used as a binder for pressure molding, the process is relatively complicated and has not been applied to the wet process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment 1, the method for preparing paper pulp by using Gramineae stalks, the following steps are carried out in sequence:

[0047] 1), raw material pretreatment:

[0048] The dried rice straw is cut into straw sections with a length of 4-9 cm by a cutting machine, soaked in hot water (at a temperature of 80° C.) for 30 minutes, and the treated straw sections are obtained.

[0049] 2), physical pulping: mechanically refine and rub the processed straw section with a rubbing and spinning machine, and the specific process conditions are as follows: add 5% of the dry weight of rice straw in step 1) to the treated straw section The water enters the grinding and dividing machine for grinding, and the 50kw grinding and dividing machine treats it for 5 to 10 minutes to obtain straw fiber tendons with a length of 30 to 50 mm. Observe under a microscope: the straw fiber tendons contain 30 to 45 cells.

[0050] 3), the straw fiber tendon obtained in step 2) is further rubbed a...

example 1

[0056] Example 1, the preparation of pulp molded product

[0057] 1) Pulping: the pulp sheet obtained in the above-mentioned embodiment 1 and water are mixed with water according to the dry weight ratio of 1:3 (that is, the dry weight of the pulp sheet and the water weight ratio is 1:3), and the above-mentioned pulp is put into Pulp storage tank, then dilute with water, and evenly stir with a 10r / min agitator to obtain a slurry; add water to dilute, and adjust the slurry into a slurry concentration of 3%, that is, the dry weight of the pulp accounts for 3% of the slurry weight.

[0058] 2) Molding: The prepared slurry is transported to the mold cavity of the automatic pulp molding machine through the pipeline, and is sucked and filtered by vacuum filtration, and the pulp is filtered with 2.0Kg / cm 3 pressure, press and filter out the moisture that accounts for 90% of the slurry weight in the mold cavity earlier to obtain a wet base; that is, the weight of the wet base is 10% of...

Embodiment 2

[0063] Embodiment 2, utilize the method for preparing paper pulp by wheat straw, carry out following steps successively:

[0064] 1), raw material pretreatment:

[0065] The fresh wheat straw is cut into straw sections with a length of 4-9 cm by a cutting machine to obtain fresh straw sections.

[0066] 2) Physical pulping: Use a rubbing and splitting machine to mechanically refine and rub the fresh straw, and use a 50kw rubbing and splitting machine to process it for 5-10 minutes to obtain straw fiber tendons with a length of 30-40mm. Observation: the straw fiber tendon contains 15-30 cells.

[0067] 3), the straw fiber tendon obtained in step 2) is further rubbed and ground with a medium-concentration refiner, and the specific process conditions are as follows: add water that accounts for 10% of the dry weight of wheat straw in step 1) to the straw fiber tendon, Grinding in an 80kw medium-consistency refiner for 4-5 minutes, at this time, the length of the straw fiber tend...

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Abstract

The invention discloses a method for preparing pulp by gramineous straw. The method sequentially comprises the following steps: (1) pre-treating the gramineous straw as a raw material; (2) physically pulping to obtain a straw fiber reinforced polymer (FRP); (3) adding water to the straw FRP obtained in step (2), thread-rolling and grinding until length of the straw FRP is 10-20mm to obtain fiber pulp; (4) decoloring or coloring the fiber pulp; and (5) mixing the fiber pulp treated in step (4) with the conventional chemical pulp or waste pulp based on the dry weight ratio of 1:0.1-10, then adding water for diluting the obtained mixed pulp, and finally obtaining the mixed pulp raw material. The invention further discloses use of the obtained pulp in preparation of the pulp molding product. The pulp obtained by the method takes the waste crop-the gramineous straw as the raw material and has the characteristics of low raw material cost, wide use, good industrial application prospect and the like.

Description

technical field [0001] The invention belongs to the field of biotechnology, and relates to a method for preparing new pulp and pulp molded products from straws of gramineous plants such as crops and garden plants, in particular to a method of using mechanical pulping method to produce straws of gramineous crops and their close relatives. The invention relates to a method for performing physical and chemical treatment on straw and using its fibers to prepare pulp molded products. Background technique [0002] Crop straw is what remains after harvesting crops. As a large agricultural country, my country has many types of crops and a large quantity. According to statistics, my country's annual crop straw output reaches more than 800 million tons. With so many crop stalks, only about 30% are utilized. In recent years, with the development of the rural economy, the output of crop straw in my country has increased year by year, with an average annual growth rate of more than 2....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H11/12D21B1/02D21B1/06D21B1/34D21C9/00D21C9/16D21C9/153D21H21/28
Inventor 陈集双覃佐东
Owner NANJING BIOFUNCTION CO LTD
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