阅读说明：本技术 竹材展开方法和竹板材 (Bamboo material unfolding method and bamboo plate ) 是由 刘红征 林海 李延军 于 2014-04-14 设计创作，主要内容包括：本发明提出了一种竹材展开方法和竹板材,所述竹材展开方法包括去除竹筒的至少一部分竹青且保留所述竹筒的竹黄；在所述竹筒上开设出沿所述竹筒的轴向贯通的至少一个轴向缝隙；软化所述竹筒；在所述竹筒的内表面上加工出槽和/或孔眼；和展开去除了至少一部分竹青且保留了竹黄的竹筒以得到展开的竹板材。根据本发明的竹材展开方法,开裂少,展开简单,节省材料。(The invention provides a bamboo material unfolding method and a bamboo board, wherein the bamboo material unfolding method comprises the steps of removing at least a part of green bamboos of a bamboo tube and reserving tabasheers of the bamboo tube; at least one axial gap which is communicated along the axial direction of the bamboo tube is arranged on the bamboo tube; softening the bamboo tube; processing a groove and/or an eyelet on the inner surface of the bamboo tube; and unfolding the bamboo tube from which at least a part of the green bamboo is removed and the tabasheer is remained to obtain an unfolded bamboo board. According to the bamboo material unfolding method, the cracking is less, the unfolding is simple, and the material is saved.)

1. The bamboo material unfolding method is characterized by comprising the following steps:

removing at least a part of green bamboo of the bamboo tube and reserving tabasheer of the bamboo tube;

at least one axial gap which is communicated along the axial direction of the bamboo tube is arranged on the bamboo tube;

softening the bamboo tube;

processing a groove and/or an eyelet on the inner surface of the bamboo tube; and

unfolding the softened bamboo tube from which at least a part of the green bamboo has been removed and the tabasheer has remained to obtain an unfolded bamboo board, the unfolding of the bamboo tube and the machining of grooves and/or perforations in the inner surface of the bamboo tube being performed simultaneously by means of pairs of press rolls, wherein only one of the first pair of press rolls for first unfolding has teeth.

2. The bamboo spreading method according to claim 1, wherein only the plurality of perforations spaced apart from each other are formed on the inner surface of the bamboo tube.

3. The bamboo spreading method according to claim 1, wherein only the plurality of grooves spaced apart from each other are formed on the inner surface of the bamboo tube.

4. The bamboo spreading method according to claim 3, wherein the length direction of the grooves intersects with the axial direction of the bamboo tube.

5. The bamboo stretching method as claimed in claim 1, wherein the grooves and/or perforations are formed on the inner surface of the bamboo tube after softening and before stretching.

6. The bamboo spreading method according to claim 1, wherein the grooves and/or perforations are formed on the inner surface of the bamboo tube before the softening.

7. The bamboo wood spreading method according to any one of claims 1-6, wherein the grooves and/or perforations extend within or from the tabasheer of the bamboo tube into the flesh of the bamboo tube.

8. The bamboo stretching method as claimed in any one of claims 1 to 6, wherein the removing of at least a part of the outer layer of the bamboo tube is continuously removing the outer layer of the bamboo tube in an axial direction of the bamboo tube and at intervals in a circumferential direction of the bamboo tube.

9. The bamboo stretching method as claimed in any one of claims 1 to 6, wherein the removing of at least a portion of the outer layer of the bamboo tube is a continuous removal of the outer layer of the bamboo tube in a circumferential direction of the bamboo tube and at intervals in an axial direction of the bamboo tube.

10. The bamboo stretching method as claimed in any one of claims 1 to 6, wherein the removing of at least a portion of the outer surface of the bamboo tube is a green-removing groove formed in the outer surface of the bamboo tube.

11. The bamboo material spreading method according to claim 10, wherein the de-greening groove extends in an axial direction or a circumferential direction of the bamboo tube.

12. The bamboo material spreading method according to claim 10, wherein the de-greening groove extends spirally in the axial direction of the bamboo tube.

13. The bamboo material spreading method according to any one of claims 1 to 6, further comprising removing an outer layer of a predetermined thickness from an outer surface of the bamboo plate material after spreading and/or removing an inner layer of a predetermined thickness from an inner surface of the bamboo plate material after spreading.

14. The bamboo wood spreading method according to claim 13, wherein the outer layer and/or the inner layer is removed by planing or milling.

15. The bamboo stretching method as claimed in any one of claims 1 to 6, further comprising removing an inner node of the bamboo tube and/or removing an outer node of the bamboo tube.

16. The bamboo material spreading method according to any one of claims 1 to 6, wherein the softening is performed by placing the bamboo tube in a softening vessel and feeding saturated steam and/or superheated steam into the softening vessel.

17. The bamboo material spreading method according to claim 16, wherein the pressure of the saturated steam and/or the superheated steam in the softening vessel is 0.6-1.8 mpa.

18. The bamboo material spreading method according to any one of claims 1 to 6, wherein the softening is performed by heating the bamboo tube by means of water boiling, steam heating, heat transfer oil heating, microwave heating, high frequency heating, or the like.

19. A method as defined in any one of claims 1-6, characterised in that the removed green is 0.2-2 mm thick.

20. The bamboo stretching method as claimed in any one of claims 1 to 6, wherein the bamboo tube is gradually stretched.

21. The bamboo material spreading method according to claim 20, wherein the spreading is a transverse spreading, a longitudinal spreading or an oblique spreading.

22. Bamboo panel, characterized in that it is obtained by a bamboo unfolding method according to any of claims 1-21.

Technical Field

The invention relates to the technical field of bamboo processing, in particular to a bamboo material unfolding method and a bamboo board applying the method.

Background

Bamboo is widely used as a bamboo board made of bamboo due to its excellent properties relative to wood. Conventionally, a bamboo board is manufactured by using bamboo, a bamboo tube is split along an axial direction to obtain bamboo strips, the bamboo strips are split into bamboo chips along a thickness direction of the bamboo strips (namely, a radial direction of the bamboo tube), and the bamboo chips are dipped and pressed into the bamboo board. The production method of the bamboo board has the disadvantages of large glue consumption, poor environmental protection performance, complex production process and poor refrigeration of the board. Therefore, the single-layer bamboo board is obtained by splitting the bamboo tube along the axial direction and then unfolding the split bamboo tube, and the application is more and more because glue splicing is not needed and the application is environment-friendly. However, due to the thin hollow wall of bamboo, the problem of cracking during the unfolding process has been a significant factor restricting the bamboo unfolding method, in other words, during the unfolding process, the bamboo tube has long and deep cracks, even cracks penetrating along the thickness direction of the bamboo tube, thereby limiting the application of the unfolded bamboo board, and the unfolded bamboo board has poor appearance. Various problems still exist in the bamboo material unfolding method in the prior art, so that the improvement requirement exists.

Disclosure of Invention

The present application is based on the recognition and discovery by the inventors of the following facts and the following problems existing in the prior art:

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic flow diagram of a bamboo material unfolding method according to one embodiment of the invention.

Fig. 2 is a schematic flow diagram of a bamboo material spreading method according to another embodiment of the invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be mechanically coupled, directly coupled, indirectly coupled through intervening media, or may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

A bamboo material spreading method according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

As shown in fig. 1, a bamboo material spreading method according to an embodiment of the present invention includes removing at least a portion of a green bamboo of a bamboo tube and retaining a tabasheer of the bamboo tube, forming at least one axial slit on the bamboo tube to penetrate in an axial direction of the bamboo tube, softening the bamboo tube, forming grooves and/or perforations on an inner surface of the bamboo tube, and spreading the softened bamboo tube from which at least a portion of the green bamboo is removed and the tabasheer is retained to obtain a spread bamboo board.

According to the bamboo unfolding method provided by the embodiment of the invention, through the combination of removing a part of the outer layer of the bamboo and processing the grooves and/or the eyelets on the inner layer of the bamboo before or in the unfolding process, on one hand, cracking caused by the outer layer of the bamboo is reduced, on the other hand, cracking caused by the inner layer of the bamboo is reduced, and moreover, as a part of the outer layer of the bamboo is removed, the depth of the grooves and/or the eyelets on the inner layer of the bamboo can be reduced, for example, the grooves and/or the eyelets are only formed on the inner layer of the bamboo or slightly extend into the bamboo to a certain depth, so that wider product appearance requirements can be met, therefore, the influence of the eyelets and/or the grooves on the surface quality of the unfolded bamboo board is reduced, and even if the part with the eyelets and/or the grooves is removed later, the thickness of the removed material is smaller.

Herein, the removal of at least a portion of the outer layer of the bamboo tube is to be understood in a broad sense and may include the removal of all or a portion of the outer layer of the bamboo tube. Removing all the bamboo green can be: removing the bamboo green of the whole thickness along the radial direction of the bamboo tube, and removing the bamboo green of the whole outer surface of the bamboo tube; or removing the bamboo green with a certain thickness along the radial direction of the bamboo tube, and removing the bamboo green on the whole outer surface of the bamboo tube; or removing a certain thickness of bamboo green along the radial direction of the bamboo tube and removing a part of the bamboo green on the whole outer surface of the bamboo tube; or removing the bamboo outer surface of the bamboo tube by removing the bamboo outer surface of the bamboo tube. It is understood that even if the entire outer periphery of the bamboo tube is removed, since the sectional shape of the bamboo tube is not strictly circular and the radial dimension of the bamboo tube varies in the axial direction of the bamboo tube, a portion of the outer periphery of the bamboo tube may be left unremoved, which is still considered to be the removal of the entire outer periphery. Further, the removing of at least a portion of the outer skin of the bamboo tube may be removing the outer skin continuously in the axial direction of the bamboo tube and at intervals in the circumferential direction of the bamboo tube, or removing the outer skin continuously in the circumferential direction of the bamboo tube and at intervals in the axial direction of the bamboo tube.

The step of forming at least one axial slit on the bamboo tube, which penetrates the bamboo tube in the axial direction of the bamboo tube, may be performed before or after softening the bamboo tube. Preferably, two axial slits are opened on the bamboo tube opposite to each other to divide the bamboo tube into two symmetrical halves.

Preferably, the removal of the outer skin of the bamboo may be performed before the softening, so as to mechanically remove the outer skin of the bamboo using de-tanning equipment. Herein, the term "bamboo" refers to a bamboo tube, wherein the bamboo tube is not removed in a radial direction, but it should be understood that when other treatment is performed on the bamboo tube, such as when the inner joint of the bamboo tube is removed, a portion of the bamboo tube may be removed, and this condition is still considered as non-removed bamboo tube, i.e. the bamboo tube is left intact.

In a preferred embodiment of the invention, the removal of at least a part of the green bamboo of a bamboo tube and the retention of the tabasheer of said bamboo tube is: removing a bamboo green layer with a certain thickness along the radial direction of the bamboo tube, and removing the bamboo green on the whole outer surface of the bamboo tube; while retaining intact tabasheer. Thus, the mechanical removal of the green bamboo is facilitated, while the complete tabasheer is retained, i.e. the tabasheer is not removed before and during the unfolding process, and the unfolding process can be simplified by retaining the complete tabasheer because the tabasheer is not easily removed at the inner surface of the bamboo tube. Here, it should be understood that machining grooves and/or perforations into the shirttail on the inner surface of the bamboo tube is not considered as removing the shirttail.

According to a preferred embodiment of the invention, the machining of the grooves and/or eyelets on the inner surface of the bamboo tube is performed simultaneously, in other words, simultaneously with the machining of the grooves and/or eyelets. Therefore, the process of bamboo material unfolding is simplified, the unfolding effect is good, cracking hardly occurs, and the yield is greatly improved.

However, it is to be understood that the present invention is not limited thereto. Optionally, machining grooves and/or perforations into the inner surface of the bamboo tube may be performed before unrolling, e.g. preferably after softening and before unrolling. The machining of the grooves and/or holes is made easier, since the grooves and/or holes are machined after softening. Of course, the machining of the grooves and/or perforations can also be carried out before the softening.

The processing of the groove and/or the hole on the inner surface of the bamboo tube comprises the processing of the groove and the hole on the inner surface of the bamboo tube simultaneously, or the processing of the groove only on the inner surface of the bamboo tube, or the processing of the hole only on the inner surface of the bamboo tube.

Preferably, the grooves machined on the inner surface of the bamboo tube are a plurality of grooves intersecting with the axial direction of the bamboo tube (i.e. the length direction of the bamboo tube), i.e. the length direction of the grooves is not parallel to the length direction of the bamboo tube but intersects with each other when viewed from the unfolded bamboo board.

In some embodiments of the invention, the grooves and/or perforations extend from the inner surface of the bamboo tube to a thickness within the flesh of the bamboo tube. Alternatively, the slots and/or perforations may extend only in the shirttail layer.

For convenience of description, the following description will be made by taking the example of forming the holes only on the inner surface of the bamboo tube.

As described above, it is preferable that the bamboo tube is unfolded while the inner surface of the bamboo tube is processed with the eyelets. More preferably, the unrolling of the bamboo tube and the machining of the grooves and/or perforations in the inner surface of the bamboo tube are performed simultaneously by means of pairs of press rolls, wherein the surface of one of the pair of press rolls is provided with teeth for forming perforations in the inner surface of the bamboo tube. In other words, the pair of press rolls are used as both the unrolling apparatus for unrolling the bamboo tube and the perforation processing apparatus for processing the inner surface of the bamboo tube, thereby further simplifying the equipment and process required for unrolling.

Preferably, in some embodiments of the present invention, the holes formed on the inner surface of the bamboo tube are spaced apart and discretely distributed, so that the stress can be better dispersed and the cracking can be avoided. Here, the discrete distribution means that the perforations are not arranged in aligned rows along the bamboo tube axis direction on the inner surface of the bamboo tube, for example, the perforations are not arranged in aligned rows along the length direction of the bamboo panel and are not arranged in aligned columns along the width direction of the bamboo panel, as viewed from the unfolded bamboo panel. Alternatively, the perforations are distributed staggered along the length direction of the bamboo panel and staggered with each other along the width direction.

In other words, the teeth are not continuous in the surface of the roll in the axial and circumferential directions of the roll, and are not arranged in one or more aligned rows of teeth in the circumferential direction of the roll and are not arranged in one or more aligned rows of teeth in the axial direction of the roll. That is, the teeth are staggered in the circumferential direction of the press roll and staggered in the axial direction of the press roll.

Of course, it will be appreciated that when the grooves are formed in the inner surface of the bamboo tube, the teeth may be continuous in the circumferential direction of the press roll, for example, extending helically in the axial direction of the press roll.

In one embodiment of the invention, the removing at least a part of the outer bamboo green of the bamboo tube is to process an outer green removing groove on the outer surface of the bamboo tube. The green removing groove can extend along the axial direction or the circumferential direction of the bamboo tube. Optionally, the de-greening groove extends spirally along the axial direction of the bamboo tube.

Preferably, the bamboo material spreading method according to the embodiment of the present invention further includes removing an outer layer of a predetermined thickness from the outer surface of the bamboo plate material after spreading, for example, when a portion of the outer layer of the bamboo is removed before spreading, a portion of the outer layer of the bamboo is left on the outer surface of the bamboo plate material after spreading, and the outer layer of the predetermined thickness may be removed from the outer surface of the bamboo plate material after spreading according to the application requirement, so that the left outer layer of the bamboo is removed. Preferably, the bamboo material spreading method according to an embodiment of the present invention further includes removing an inner layer of a predetermined thickness from an inner surface of the bamboo panel after spreading. As described above, since the inner surface of the bamboo tube is provided with the holes and/or grooves, the inner surface of the bamboo panel after being unfolded is left with the marks of the holes and/or grooves, and the inner layer of a predetermined thickness can be removed from the inner surface of the bamboo panel according to the needs of the application, so that the holes and/or grooves are not seen. The outer and inner layers may be removed by planing or milling.

Preferably, the bamboo material unfolding method according to the embodiment of the invention further comprises removing the inner joint of the bamboo tube and/or removing the outer joint of the bamboo tube.

In an embodiment of the present invention, the softening of the bamboo tube may be performed by placing the bamboo tube in a softening vessel and feeding saturated steam and/or superheated steam into the softening vessel. For example, the pressure of the saturated steam and/or superheated steam in the softening vessel is 0.6 to 1.8 mpa.

Alternatively, the bamboo tube may be softened by heating the bamboo tube by water boiling, steam heating, heat transfer oil heating, microwave heating, high frequency heating, or the like.

In accordance with the practice of the invention, preferably all of the bamboo green is removed prior to unrolling, for example, the thickness of the removed layer of bamboo green may be 0.2-2 millimeters. The inventor of the application finds that the hardest part of the outer side of the bamboo tube can be guaranteed to be removed by removing the bamboo green of 0.2-2 mm, the removal amount is reduced as far as possible, the material waste is reduced, the phenomenon that cracks appear after flattening is avoided, and the softening is facilitated.

In one embodiment of the invention, the bamboo tube after the green bamboo is removed is gradually unfolded. For example, the bamboo tube is gradually spread using press rolls of different diameters.

More specifically, the spreading is transverse spreading, longitudinal spreading or oblique spreading, wherein the transverse spreading means that the axial direction of the press roll is consistent with the axial direction of the bamboo tube during spreading, the longitudinal spreading means that the axial direction of the press roll is orthogonal to the axial direction of the bamboo tube during spreading, and the oblique spreading means that the axial direction of the press roll forms a predetermined angle with the axial direction of the bamboo tube during spreading, and the angle is more than 0 and less than 90 degrees. During the longitudinal unrolling, the bamboo tube may be gradually unrolled using rollers of different lengths.

According to the bamboo unfolding method provided by the embodiment of the invention, at least a part of bamboo green is removed before unfolding, tabasheer is reserved, and holes and/or grooves are processed on the inner surface of the bamboo tube before or in the unfolding process, so that the unfolding difficulty is reduced, the material waste is reduced, the cracking of the unfolded bamboo board is reduced, and the qualified rate is improved. Moreover, at least a part of the bamboo green is removed, so that the bamboo tube is softened, and the unfolding effect is further improved.

It should be understood that, the execution sequence of the steps in the bamboo material unfolding method according to the embodiment of the present invention is not particularly limited, and the preferred execution sequence of the steps is as follows: inner panel removal → removal of a portion of the outer panel → split → softening → deployment (forming perforations and/or grooves in the inner surface of the bamboo tube while it is deployed, embodiments of the invention are not so limited, for example, the execution order may be: slotting → removing all the bamboo green → removing the inner node → softening → expanding (forming holes and/or grooves on the inner surface of the bamboo tube while expanding; removing an inner section → removing a part of bamboo green → softening → forming an eyelet and/or a groove on the inner surface of the bamboo tube → expanding; softening → removing inner node → removing part of bamboo green → slitting → expanding (forming holes and/or grooves on the inner surface of the bamboo tube while expanding; removing the outer bamboo skin → removing the inner node → slitting → softening → expanding (forming the hole and/or groove on the inner surface of the bamboo tube while expanding → planing off the inner layer of predetermined thickness from the inner surface of the expanded bamboo panel → planing off the outer layer of predetermined thickness from the outer surface of the expanded bamboo panel.

A bamboo material spreading method according to a preferred example of the present invention will be described with reference to fig. 2.

As shown in fig. 2, first, the inner and outer segments of the bamboo tube are removed. And then, mechanically removing at least a part of the bamboo green of the bamboo tube by using green removing equipment and keeping the tabasheer of the bamboo tube. Then, two axial slits are opened in the bamboo tube, the two axial slits being opposite to each other so as to divide the bamboo tube into two halves. Then, the divided bamboo tube is put in a softening vessel for softening. After softening, the bamboo tube is unfolded by the pair of press rolls with convex teeth on one of the press rolls. Preferably, the bamboo tube is gradually spread, and it is understood that when gradually spreading the bamboo tube, a plurality of pairs of press rolls may be used for spreading, but only one of the first pair of press rolls for first spreading has a convex tooth, and the subsequent pair of press rolls may not be provided with the convex tooth. Knurling may be formed on the surface of the pressure roller to facilitate spreading.

Preferably, after the bamboo tube is spread by the press rolls, the spread bamboo board may be further pressed into a flat bamboo board by a hot press or a cold press if the bamboo tube still has a certain curvature.

The invention also provides a bamboo board which is unfolded by the bamboo unfolding method.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.