阅读说明：本技术 一种连续竹纤维制备方法 (Preparation method of continuous bamboo fiber ) 是由 程海涛 李明鹏 王戈 张文福 顾少华 于 2020-05-19 设计创作，主要内容包括：本发明公开一种连续竹纤维制备方法,涉及竹纤维制备技术领域,包括以下步骤：将竹子原材料加工成网纹状竹纤维带；竹纤维带筛选：根据产品需要,筛选出不同性能的网纹状竹纤维带；经筛选合格后所得的网纹状竹纤维带进一步进行高压分纤；经过高压分纤的网纹状竹纤维带分离成长细比不同规格的竹纤维；竹纤维形成密度均一且部分定向的竹纤维毡；竹纤维毡形成线密度均一且定向的竹纤维束；竹纤维束加捻成竹纤维纱线；竹纤维纱线成绳；规格加工成纱锭。本发明以竹子代替部分麻、玻纤或塑料,降低成本,并实现竹纤维制备的规模化、连续化。(The invention discloses a continuous bamboo fiber preparation method, which relates to the technical field of bamboo fiber preparation and comprises the following steps: processing a bamboo raw material into a reticulate bamboo fiber belt; screening the bamboo fiber tape: screening reticulate bamboo fiber belts with different performances according to the product requirements; screening qualified reticulate bamboo fiber strips, and further performing high-pressure fiber separation on the reticulate bamboo fiber strips; the reticulate pattern bamboo fiber band subjected to high-pressure fiber separation is separated into bamboo fibers with different slenderness ratios and specifications; the bamboo fibers form a bamboo fiber felt with uniform density and partially oriented; the bamboo fiber felt forms a bamboo fiber bundle with uniform linear density and orientation; twisting the bamboo fiber bundle into bamboo fiber yarn; forming the bamboo fiber yarns into ropes; and processing the standard into a spindle. The invention uses bamboo to replace part of hemp, glass fiber or plastic, reduces cost and realizes scale and continuous preparation of bamboo fiber.)

1. A preparation method of continuous bamboo fiber is characterized by comprising the following steps: the method comprises the following steps:

processing bamboo raw materials into bamboo fiber belts to form primary differentiated bamboo fibers;

step two, screening the bamboo fiber tape: screening out bamboo fiber belts with different performances according to the product requirements;

step three, performing high-pressure fiber separation on the bamboo fiber belt obtained after screening is qualified, so as to realize the separation and forming of bamboo fibers and provide a bamboo fiber raw material for a subsequent bamboo fiber product;

step four, separating the bamboo fiber tape subjected to high-pressure fiber separation into bamboo fibers with different slenderness ratios and different specifications;

step five, forming a bamboo fiber felt with uniform density and partially oriented bamboo fibers by using the bamboo fibers;

step six, forming a bamboo fiber bundle with uniform linear density and orientation by the bamboo fiber felt;

step seven, twisting the bamboo fiber bundles into bamboo fiber yarns;

step eight, forming a rope by using bamboo fiber yarns;

and step nine, processing the yarn into a spindle according to the specification.

2. The continuous bamboo fiber preparation method according to claim 1, wherein: the bamboo fiber belt in the first step is a reticulate pattern bamboo fiber belt.

3. The continuous bamboo fiber preparation method according to claim 2, wherein: selecting fresh Sagittaria sagittifolia in three years, cutting the cylindrical Sagittifolia sagittifolia into two halves by using a machine tool to enable the Sagittaria sagittifolia to be in a hollow cylinder or semi-cylinder shape, removing bamboo green and bamboo yellow by using an MZWX2030A efficient anilox bamboo fiber preparation machine, and performing rolling and defibering by using a smooth roller and a toothed roller to finally form an anilox bamboo fiber belt with specified length and width, criss-cross fibers and 1-7mm thickness.

4. The continuous bamboo fiber preparation method according to claim 1, wherein: and in the second step, the bamboo fiber belts are screened according to optical grading or mechanical bending modulus.

5. The continuous bamboo fiber preparation method according to claim 1, wherein: twisting the bamboo fiber tape in the third step to form fibrous bamboo chips with specified length, width and thickness of 1-5mm, providing bamboo fiber raw materials for subsequent bamboo fiber products, and adjusting the temperature of the bamboo fiber tape to be 20-75 ℃ and the humidity to be 10-80%.

6. The continuous bamboo fiber preparation method according to claim 5, wherein: in the fourth step, bamboo fiber raw materials with the thickness of 1-5mm are subjected to defibering, impurities and crushed materials are removed, and the bamboo fiber raw materials are separated into fluffy flocculent bamboo fibers with different slenderness ratios and specifications.

7. The continuous bamboo fiber preparation method according to claim 6, wherein: and fifthly, spreading the fluffy bamboo fibers to form a continuous bamboo fiber felt with fibers regularly distributed in a specified geometric shape, specified density and specified width and thickness.

8. The continuous bamboo fiber preparation method according to claim 7, wherein: and in the sixth step, the fiber felt is stretched and oriented to form continuous bamboo fiber bundles with specified width and thickness and fiber length directions distributed along the conveying direction.

9. The continuous bamboo fiber preparation method according to claim 8, wherein: in the seventh step, the continuous bamboo fiber bundle is rolled, drawn and twisted to form a bamboo fiber yarn with specified twist and specified diameter, and the diameter range of the bamboo fiber yarn is 1.5-5 mm;

and step eight, stranding and twisting the bamboo fiber yarns to form the ropes.

10. The continuous bamboo fiber preparation method according to claim 9, wherein: adding fibers to be mixed in the seventh step, and mixing and twisting the bamboo fiber bundles and the fibers to be mixed to form mixed fiber yarns; the fibers to be mixed include natural fibers and/or chemical fibers.

Technical Field

The invention relates to the technical field of bamboo fiber preparation, in particular to a continuous bamboo fiber preparation method.

Background

The bamboo fiber is a natural plant fiber, mainly has the excellent characteristics of rich resources, high physical and mechanical strength, quick moisture absorption and release, antibiosis, odor removal and the like, more importantly, the bamboo fiber is a renewable resource, can be naturally and biologically degraded, is beneficial to environmental protection, can be applied to the fields of textiles, composite materials, building materials, environment-friendly materials, packaging and the like, meets the pursuit of people for novel textiles and novel materials, realizes the sustainable development of human beings and society, and has higher social benefit and economic benefit.

The existing industrial preparation process of pure continuous bamboo fiber is not formed, complete processing equipment of continuous bamboo fiber is developed to form the preparation process of continuous bamboo fiber, the bamboo fiber can completely (or partially) replace fibrilia, glass fiber, chemical fiber and other materials, the continuous bamboo fiber is compounded with resin to prepare winding and weaving prepreg (filiform or strip-shaped), the prepreg is processed to prepare the preformed body with the special-shaped structure, and finally the plant fiber reinforced composite material and the product thereof are formed, so that the industrial structure adjustment and the technical transformation upgrade of the bamboo fiber composite material are promoted, and the preparation process has a breakthrough effect on the expansion and the application of the bamboo fiber composite product.

Therefore, it is desirable to provide a new method for preparing continuous bamboo fiber to solve the above problems in the prior art.

Disclosure of Invention

The invention aims to provide a method for preparing continuous bamboo fibers, which aims to solve the problems in the prior art, reduce the cost and realize large-scale and continuous preparation of the bamboo fibers.

In order to achieve the purpose, the invention provides the following scheme: the invention provides a preparation method of continuous bamboo fibers, which comprises the following steps:

processing bamboo raw materials into bamboo fiber belts to form primary differentiated bamboo fibers;

step two, screening the bamboo fiber tape: screening out bamboo fiber belts with different performances according to the product requirements;

step three, performing high-pressure fiber separation on the bamboo fiber belt obtained after screening is qualified, so as to realize the separation and forming of bamboo fibers and provide a bamboo fiber raw material for a subsequent bamboo fiber product;

step four, separating the bamboo fiber tape subjected to high-pressure fiber separation into bamboo fibers with different slenderness ratios and different specifications;

step five, forming a bamboo fiber felt with uniform density and partially oriented bamboo fibers by using the bamboo fibers;

step six, forming a bamboo fiber bundle with uniform linear density and orientation by the bamboo fiber felt;

step seven, twisting the bamboo fiber bundles into bamboo fiber yarns;

step eight, forming a rope by using bamboo fiber yarns;

and step nine, processing the yarn into a spindle according to the specification.

Preferably, the bamboo fiber tape in the first step is a reticulate bamboo fiber tape.

Preferably, in the first step, fresh Sagittaria sagittifolia is selected for three years, a cylindrical Sagittifolia sagittifolia is cut into two halves by a machine tool to form the Sagittaria sagittifolia into a hollow cylinder or a semi-cylinder, the surf green and the tabasheer are removed by using an MZWX2030A efficient anilox bamboo fiber preparation machine, and the bamboo green and the tabasheer are rolled and defibered by a smooth roller and a toothed roller to finally form the anilox bamboo fiber band with specified length and width, fiber criss-cross and thickness of 1-7 mm.

Preferably, the bamboo fiber tapes in the second step are screened according to optical grading or mechanical flexural modulus.

Preferably, the bamboo fiber belt in the third step is twisted to form a fibrous bamboo chip with the specified length, width and thickness of 1-5mm, so as to provide a bamboo fiber raw material for subsequent bamboo fiber products, the temperature of the bamboo fiber belt is adjusted to be 20-75 ℃, and the humidity is adjusted to be 10-80%.

Preferably, in the fourth step, the bamboo fiber raw material with the thickness of 1-5mm is subjected to defibering, impurities and crushed materials are removed, and the bamboo fiber raw material is separated into fluffy flocculent bamboo fibers with different slenderness ratios and different specifications.

Preferably, in the fifth step, the fluffy bamboo fibers are spread to form a continuous bamboo fiber felt with fibers regularly distributed in a specified geometric shape, specified density and specified width and thickness.

Preferably, the fiber felt in the sixth step forms continuous bamboo fiber bundles with specified width and thickness and fiber length direction distributed along the conveying direction through stretching and orientation.

Preferably, the bamboo fiber yarn with the specified twist and the specified diameter is formed by winding, drawing and twisting the continuous bamboo fiber bundle in the seventh step, and the diameter range of the bamboo fiber yarn is 1.5-5 mm;

and step eight, stranding and twisting the bamboo fiber yarns to form the ropes.

Preferably, fibers to be mixed are added in the step seven, and the bamboo fiber bundles and the fibers to be mixed are mixed and twisted to form mixed fiber yarns; the fibers to be mixed include natural fibers and/or chemical fibers.

Compared with the prior art, the invention has the following technical effects:

the invention uses bamboo to replace part of hemp, glass fiber or plastic, reduces cost and realizes scale and continuous preparation of bamboo fiber.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The present invention will be described in further detail with reference to specific embodiments in order to make the above objects, features and advantages more apparent and understandable.

Example one

The embodiment provides a preparation method of continuous bamboo fibers, which comprises the following steps:

s1, processing bamboo wood/bamboo chips into a reticular bamboo fiber tape;

selecting fresh Sagittaria trifolia Vahl, perforating by a perforating machine or other methods, or cutting cylindrical bamboo into two halves by machines, making Sagittaria trifolia Vahl into hollow cylinder or semi-cylinder, removing bamboo green and tabasheer by using an MZWX2030A high-efficiency anilox bamboo fiber preparation machine, and finally forming the stable anilox bamboo fiber band with certain length and width and fiber criss-cross thickness of 4-7mm (adjustable to bamboo) by rolling and untwining a plurality of pairs of smooth rollers and toothed rollers.

S2, screening bamboo fiber belts;

and carrying out optical grading and mechanical bending modulus on the reticulate bamboo fiber belts, and screening the reticulate bamboo fiber belts with different performances according to the product requirements.

The optical grading is determined according to the delta E chromatic difference value, the parameters of the optical grading are L, a and b respectively, and the calculation formula is as follows:

ΔE*＝[(ΔL*)2+(Δa*)2+(Δb*)2]1/2

Δ L is a luminance axis, representing black and white, 0 is black, 100 is white;

Δ a is the red-green axis, the positive value is red, the negative value is green, 0 is neutral;

Δ b is the yellow-blue axis, positive values are yellow, negative values are blue, 0 is neutral;

Δ E is defined as the total color difference of the sample, the larger the value, the larger the color difference; typically, Δ E is visually discernible at 1.5. (classified into types I and II … according to Delta E of the reticulate bamboo fiber tape)

The mechanical bending resistance modulus is that constant pressure is applied to the reticulate pattern bamboo fiber tape to realize performance detection of the reticulate pattern bamboo fiber tape, so that accurate grading is realized, and products with unqualified mechanical defects are found.

The color difference is generally classified into 6 levels: no color difference, and delta E is less than or equal to 1.5; very slight, 3; slightly, 6; obviously, 9; larger, 12; severe, greater than 12.

The mechanical modulus measuring range is 0-5Gpa, the precision is 0.1%, and the feeding of defects can be accurately and rapidly identified.

S3, further performing high-pressure fiber separation on the qualified bamboo fiber tape, wherein the high-pressure fiber separation means that high pressure is applied to the bamboo fiber tape, and the bamboo fiber tape is extruded or rolled by a pair of rollers to be differentiated, so that the primary separation and forming of fibers are realized;

twisting the screened reticulate pattern bamboo fiber belt with certain geometric dimension to form fibrous bamboo chips with certain length, width and thickness of 1-5mm, providing bamboo fiber raw materials for subsequent bamboo fiber products, and adjusting the temperature of the fibers to be 20-75 ℃ and the humidity to be 10-80%.

S4, separating the high-pressure fiber separating fiber belt into bamboo fibers (referred to bamboo fiber standard) with different slenderness ratios and different specifications;

the method comprises the following steps of defibering a dense fiber belt raw material with the thickness of 1-5mm, removing impurities and crushed materials, separating the high-pressure defibered fiber belt into fluffy bamboo fibers with different slenderness ratios and different specifications, and obtaining the following specific indexes:

s5, forming a bamboo fiber felt with uniform density and partial orientation by bamboo fibers;

the fluffy flocculent fiber raw material is spread to form a continuous fiber felt with fibers regularly distributed in a certain geometric shape, a certain density and a certain width.

S6, forming a bamboo fiber bundle with uniform linear density and orientation by the bamboo fiber felt;

the fiber felt with certain geometric dimension after being felted by the fibers forms a continuous fiber bundle with certain width and thickness and the fiber length direction distributed along the conveying direction through stretching and orientation.

The width range is 1.5-5mm

S7, twisting the bamboo fiber bundles into bamboo yarns;

continuously orienting the fiber bundle, and forming fiber yarns with certain twist and certain diameter by rolling, drawing and twisting; the diameter ranges from 1.5 mm to 5 mm.

Specifically, fibers to be mixed can be added, and the bamboo fiber bundles and the fibers to be mixed are mixed and twisted to form mixed fiber yarns; the fibers to be mixed may be other natural fibers and/or chemical fibers that meet the production requirements.

S8, forming a rope by using bamboo yarns;

and (4) plying and twisting the fiber yarns twisted into yarns to form ropes.

S9, processing the yarn into a spindle according to the specification;

and converting the fiber yarn or the fiber rope which is wound into a coil from a small coil into a large coil to form spindles with different specifications.

The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.