Sandwich structure bamboo twined composite material product and manufacturing method thereof

[0019] In order to make the objectives, technical solutions and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0020] The sandwich structure bamboo-wound composite material product of the present invention, such as figure 1 As shown, from the inside to the outside, it includes an inner reinforcement layer 1, a sandwich layer 2 and an outer reinforcement layer 3. Both the inner reinforcement layer 1 and the outer reinforcement layer 3 are made of bamboo strips with resin adhered to a layer Or multi-layer bamboo strips, the specific operation is as follows: cut the original bamboo into a bamboo strip with a length of 2-6m, a thickness of 0.5-1.5mm, and a width of 1-10mm, into a continuous shape (for example, the bamboo strips can be arranged in parallel and close In a row, arrange multiple rows along the longitudinal direction, stitch it into a continuous long bamboo strip tape), roll it into a roll and start the winding work on the winding machine. The bamboo strips are wound on the core mold in a spiral or circular arrangement. Pour the amino resin adhesive prepared by mixing the amino resin, filler and curing agent according to the proportion, and wind one or more layers. The sandwich layer 2 is composed of one or more groups alternately superimposed on a hoop bamboo layer 21 and an axial bamboo flake layer 22, and the hoop bamboo layer 21 is composed of a bamboo-wound composite material along the sandwich structure. The product is composed of a plurality of spaced circumferential bamboo segments 211 distributed in the axial direction of the product. The circumferential bamboo segments 211 are formed by circumferentially winding one or more layers of bamboo pieces adhered with resin. The axial bamboo piece layer 22 The axial bamboo curtain is formed by arranging multiple rows of bamboos arranged in parallel along the axial direction with resin adhered to the ring bamboo layer 21 by winding one or more layers circumferentially. The specific operation is as follows: cut the original bamboo into bamboo slices. The rigidity of the bamboo slices is higher than that of the bamboo strips. Preferably, the width and thickness of the bamboo slices are larger than the width and thickness of the bamboo strips, and the size of the bamboo slices is 3-7m in length. , Thickness 2-5mm, width 10-30mm, made into continuous circular bamboo strips and axial bamboo curtains. The length of the circular strips is the length direction of the bamboo strips, which is made up of the bamboo strips along its length Multiple rows in the direction, 1-3 columns along the width direction, continuous long bamboo strips made by sewing, bonding, etc.; the length direction of the axial bamboo curtain is the width direction of the bamboo, which is made of bamboo It is a continuous long bamboo curtain made by sewing, bonding, etc., arranged in multiple rows in parallel along its width direction. Roll the ring-directed bamboo strip into a roll and start winding on the winding machine. The ring-directed bamboo strip is wound on the inner reinforcing layer 1 in a ring direction. While winding, pour the amino resin, filler and curing agent mixed in accordance with the ratio. The latter amino resin adhesive is wound with one or more layers to form a circular bamboo segment 211. After the winding is completed, leave a certain interval with an interval of about 400-500mm wide, and then wind the next circular bamboo segment 211 until it reaches the core The die is wound with multiple hoop bamboo segments 211 at intervals in the axial direction, preferably at equal intervals. It is also possible to arrange a plurality of hoop bamboo strips at intervals along the axial direction of the mandrel to be wound hooply at the same time; after winding, the hoop bamboo segments 211 form the hoop bamboo layer 21, and the hoop bamboo segments 211 should be of equal height. Afterwards, the axial bamboo layer 22 is wound on the hoop bamboo layer 21, and the axial bamboo curtain is installed on the winding machine to start the winding work, and the axial bamboo curtain is arranged circumferentially and wound on the hoop bamboo layer 21 , While winding, pour the amino resin adhesive mixed with amino resin, filler and curing agent according to the ratio, and wind one or more layers to form the axial bamboo layer 22. It is possible to repeatedly wind multiple groups of combinations of the hoop bamboo layer 21 and the axial bamboo layer 22, and finally the outer reinforcement layer 3 is wound on the outer surface of the axial bamboo layer 22. The whole is heated and solidified to make the sandwich structure bamboo-wound composite material product. As the reinforcement layer of the conventional bamboo-wound composite material product is added with a sandwich layer formed by overlapping hoop and axial bamboo sheets with higher rigidity, a hollow skeleton structure is formed, thereby increasing the overall bamboo-wound composite material product The rigidity makes it difficult to deform and has a good overall forming effect, which is especially suitable for the production of large-caliber products such as pipe corridors and houses. The inner and outer reinforcing layers meet the required strength, and the sandwich layer meets the required rigidity, thereby reducing the thickness of the bamboo strip reinforcing layer that is wound to meet the required rigidity of large-caliber products, saving bamboo, improving production efficiency, and shortening production cycle. And the sandwich structure formed has a good sound absorption and noise reduction effect.

[0021] On the other hand, the present invention provides a method for manufacturing the above sandwich structure bamboo-wound composite material product, which includes the following steps:

[0022] (1) Wrap resin-impregnated bamboo strips on the core mold, wind one or more layers to form an inner reinforcement layer;

[0023] (2) One or more layers of resin-impregnated bamboo sheets are wound around the inner reinforcement layer at intervals along the axial direction of the core mold to form a ring-directed bamboo sheet layer;

[0024] (3) Axial bamboo curtain made of multiple rows arranged in parallel along the axis of the core mold is impregnated with resin and then wound one or more layers on the circular bamboo layer to form the axial bamboo layer ;

[0025] (4) Repeat steps (2) and (3), winding one or more groups of hoop and axial bamboo layers in turn to form a sandwich layer;

[0026] (5) Wrap resin-impregnated bamboo strips on the axial bamboo layer, wind one or more layers to form an outer reinforcement layer;

[0027] (6) Heat and solidify the core mold wound with the inner reinforcement layer, the sandwich layer, and the outer reinforcement layer to form a sandwich structure bamboo-wound composite product.

[0028] This manufacturing method can efficiently produce sandwich structure bamboo-wound composite material products.

[0029] Those skilled in the art can easily understand that the above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the present invention, All should be included in the protection scope of the present invention.