TW202035813A - Method for manufacturing a molded article through combined natural-fiber-and-chemical-fiber composite sheet including steps of fiber opening and carding, pressing, heating, and thermal bonding - Google Patents

Abstract

A method for manufacturing a forming article through combined natural-fiber-and-chemical-fiber composite sheet. First, natural fibers and chemical fibers are respectively put into a metering and conveying apparatus for weighing and metering, and then sent to the opener for a mixed opening treatment, and then processed by the carding machine for a carding treatment to produce a fluffy fibrous mesh embryo. This fibrous mesh embryo is sent to an oven for thermal treatment, and is rolled and heated through a rolling machine to produce a fibrous mesh sheet, and therefore, the single-layer or multi-layer fibrous mesh sheets are placed in a mold, and then pressed and heated in combination with the mold to make chemical fibers of the fibrous mesh sheets heat-melt and bond with natural fibers to produce composite material molded articles.

Description

Manufacturing method of natural fiber and chemical fiber composite board forming object

The present invention relates to the technical field of objects made of composite materials, in particular to a method for manufacturing natural fiber and chemical fiber composite sheet-shaped objects.

Natural fibers are more and more favored by consumers because of their safety and skin-friendly properties. Commonly used natural fibers include raw bamboo fiber, hemp fiber, coconut palm fiber, palm fiber, etc. Due to the infusibility of natural fiber, natural fiber is usually made into cloth by needle punching process. Needle punching is a common method for producing non-woven fabrics, but the connections between fibers of non-woven fabrics made by needle punching are all physical entanglements, which makes the mechanical strength of the base material relatively low, and the thickness of the base material is relatively increased, resulting in natural fibers Cloth materials cannot be used more widely. Therefore, how to solve the above-mentioned problems is the subject of urgent research for this industry.

The purpose of the present invention is to solve the above-mentioned problems, and proposes a method for manufacturing a natural fiber and chemical fiber composite sheet molded object. In order to achieve the above objective, the present invention adopts the following technical solution: a method for manufacturing a natural fiber and chemical fiber composite sheet forming object, including the following steps: Step 1: Put the natural fiber and chemical fiber into different channels of the metering and conveying device respectively , The metering and conveying equipment weighs and measures the natural fibers and chemical fibers separately according to the pre-set weight mixing ratio, and then sends them to the opener for mixing and opening treatment, so that the natural fibers and chemical fibers are made fluffy through the opening treatment Dispersed mixed fibers; Step 2: Send the opened mixed fibers to the carding machine for carding processing. The carded mixed fibers are continuously laid on the mesh belt conveyed by the conveyor drum, and the bottom of the mesh belt is provided with The blower absorbs the mixed fibers on the mesh belt by suction, and adjusts the speed of the mesh belt to control the laying thickness of the mixed fibers to make a fluffy fiber mesh; Step 3: Send the fiber mesh into the oven for heat drying treatment , The oven temperature is set to 80~120 ℃, so that the chemical fiber is formed into a molten state; Step 4: Use a roller to heat the fiber web after passing through the oven to weld the chemical fibers and roll the thickness of the fiber web Shrink to make a fiber mesh sheet; Step 5: Place the single or multi-layer overlapping fiber mesh sheet in the mold, and then press and heat with the mold to make the chemical fiber of the fiber mesh sheet heat-melt and bond with natural fibers , To produce composite material molded objects, the hot pressing temperature is 120~250℃, the hot pressing pressure is more than 0.3MPa, the final density after hot pressing is 0.8~1.2g/cm ³ , and the hot pressing time is more than 3 minutes. Finally, the object is cooled and shaped.

In the preference of the present invention, the natural fiber includes one or more of bamboo fiber, hemp fiber, coir fiber, palm fiber, coconut fiber, jute, sisal, ramie, and flax, and the chemical fiber is a hot-melt fiber .

In the preference of the present invention, the weight mixing ratio of natural fiber and chemical fiber in the step 1 is 8:2 to 2:8.

In the preference of the present invention, the weight mixing ratio of natural fiber and chemical fiber in the step 1 is 6:4 to 4:6.

In the preferred embodiment of the present invention, the mixed fiber of the step 1 is subjected to a cotton opening treatment through a cotton opener again, so that the natural fiber and the chemical fiber are uniformly mixed.

In the preferred embodiment of the present invention, the thickness of the fiber mesh sheet in the step 4 is 10-30 mm, and the fiber mesh sheet is wound by a cloth winder.

In the preference of the present invention, the hot pressing pressure in step 5 is 0.5-4 MPa, and the hot pressing time is 4-8 minutes.

In the preferred embodiment of the present invention, the step 5 adopts breathing hot pressing to implement multiple times of hot pressing and depressurization.

In the preferred embodiment of the present invention, the final density of the object in the fifth step is 0.9-1.1 g/cm ³ .

In the preference of the present invention, the natural fiber content of the step 1 is directly proportional to the thickness of the fiber mesh sheet of the step 4 and the hot pressing pressure and the hot pressing time of the step 5 respectively.

The beneficial effect of the present invention is that the natural fiber and chemical fiber composite material is melted at a high temperature at a certain temperature, and the chemical fiber in the molten state has a certain fluidity, so that it is evenly distributed between the gaps of the natural fiber. Then, the natural fiber and chemical fiber are fully bonded and combined into a fiber mesh sheet by rolling and heating, and then the single layer or multi-layer overlapping fiber The dimensional mesh sheet is placed in the mold, and then pressurized and heated with the mold, so that the chemical fibers of the fiber mesh sheet are thermally bonded and combined with natural fibers to produce composite material molded objects, which effectively solves the natural fiber in traditional technology. The problem of insufficient structural strength. In addition, natural fibers and chemical fibers are used to prepare composite material molded objects, which can greatly reduce the use of chemical fibers, as well as the discharge of waste water and exhaust gas, energy saving and environmental protection, more convenient recycling, environmental protection and recyclability. When objects made of such composite materials are scrapped, the process technology of the present invention can be used to pulverize the scrap pieces and continue processing and use, which improves the recycling rate of materials.

The technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

The present invention provides a method for manufacturing a natural fiber and chemical fiber composite sheet forming object. First, the natural fiber and chemical fiber are respectively put into a metering and conveying device for weighing and metering, and then sent to a cotton opener for mixed open cotton processing, and then passed The carding machine performs carding treatment to make a fluffy fiber mesh embryo, sends the fiber mesh embryo into an oven for heat drying treatment, and uses a roller press to roll and heat the fiber mesh to make a fiber mesh sheet. Then place the single-layer or multi-layer overlapping fiber mesh sheet in the mold, and press and heat with the mold to make the chemical fibers of the fiber mesh sheet heat-melt and bond Combine natural fibers to produce objects made of composite materials.

The method for manufacturing a natural fiber and chemical fiber composite sheet molded object of the present invention includes the following steps:

Step 1: Prepare natural fiber and chemical fiber. Natural fiber includes one or more of bamboo fiber, hemp fiber, coir fiber, palm fiber, coconut fiber, jute, sisal, ramie, flax, and chemical fiber is hot melt Sex fiber or low melting point fiber. Put natural fibers and chemical fibers into different channels of the metering and conveying equipment respectively, the weight mixing ratio of natural fibers and chemical fibers can be set to 8:2~2:8, and preferably can be set to 6:4~4:6 , The metering and conveying equipment weighs and measures the natural fibers and chemical fibers separately according to the pre-set weight mixing ratio, and then sends them to the opener for mixing and opening treatment, so that the natural fibers and chemical fibers are made fluffy through the opening treatment Dispersed mixed fibers, and the mixed fibers can be opened again through the opener to make the natural fibers and chemical fibers more evenly mixed.

Step 2: Send the opened mixed fiber to the carding machine for carding processing. The carded mixed fiber is continuously laid on the mesh belt conveyed by the conveyor drum. The bottom of the mesh belt is equipped with a blower. The mixed fibers are adsorbed on the mesh belt and transported, and the speed of the mesh belt is adjusted to control the laying thickness of the mixed fibers to make a fluffy fiber mesh.

Step 3: Send the fiber web embryo into an oven for thermal drying treatment, the oven temperature is set to 80 ~ 120 ℃, so that the chemical fiber into a molten state.

Step 4: Use the heating roller of the roller press to heat the fiber mesh after passing through the oven to weld the chemical fibers, and roll the thickness of the fiber mesh to 10~30mm to make the fiber mesh. Sheet, and fiber mesh sheet can use roll The cloth machine performs winding.

Step 5: Place the single-layer or multi-layer overlapping fiber mesh sheets in the mold, and then press and heat with the mold, so that the chemical fibers of the single or each layer of fiber mesh sheets are thermally bonded and combined with natural fibers to produce For objects molded from composite materials, the hot pressing temperature is 120-250°C, the hot pressing pressure is 0.3 MPa or more, and preferably can be set to 0.5 to 4 MPa; the density is 0.8 to 1.2 g/cm ³ , and preferably can be set to 0.9 ~1.1g/cm ³ ; the hot pressing time is more than 3 minutes, and preferably can be set to 4 to 8 minutes, and breathing hot pressing can be adopted to stagger the heat pressing and pressure relief for multiple times, for example: hot pressing 1 After ~4 minutes, the pressure is relieved and held for 1~4 minutes, and finally hot-pressed for 1~4 minutes. Finally, the object is naturally cooled and shaped, so that the composite material molded object has better structural strength, lower cost, and reduced chemical fiber The amount of use, as well as the discharge of waste water and exhaust gas, is energy-saving and environmentally friendly, more convenient for recycling, environmentally friendly and recyclable. When objects made of such composite materials are scrapped, the process technology of the present invention can be used to pulverize the scrap pieces and continue processing and use, which improves the recycling rate of materials.

The following is a list illustrating the relevant condition values in each step in the first to fifth embodiments of the present invention. The first embodiment to the fifth embodiment all implement steps 1 to 5 in order. The natural fibers and chemical fibers are respectively put into the metering and conveying equipment for weighing and metering, and then sent to the opener for mixed opening treatment, and then passed The carding machine performs carding treatment to make a fluffy fiber mesh embryo, sends the fiber mesh embryo into an oven for heat drying treatment, and uses a roller press to roll and heat the fiber mesh to make a fiber mesh sheet. Then, the fiber mesh sheets are stacked in multiple layers, and the mold is pressurized and heated, so that the chemical fibers of the fiber mesh sheets of each layer are thermally bonded and combined with natural fibers to produce a composite material molded object. For the relevant condition values in steps 1 to 5 in the first to fifth embodiments, refer to the following table:

It can be seen from this that the natural fiber content in the step 1 of the present invention is directly proportional to the thickness of the fiber mesh sheet in the step 4 and the hot pressing pressure and the hot pressing time in the step 5 respectively.

The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Anyone familiar with the technical field in the present invention Within the technical scope of the disclosure, equivalent replacements or changes based on the technical solution of the present invention and its inventive concept should be covered by the protection scope of the present invention.

Claims (10)

A method for manufacturing a natural fiber and chemical fiber composite board forming object, including the following steps: Step 1: Put the natural fiber and the chemical fiber into different channels of the metering and conveying equipment respectively, and the metering and conveying equipment according to the preset weight mixing ratio, After weighing and measuring the natural fiber and chemical fiber separately, they are sent to the opener for mixing and opening treatment, so that the natural fiber and chemical fiber are made into a fluffy and dispersed mixed fiber through the opening treatment; Step 2: After opening the cotton The mixed fibers are sent to the carding machine for carding treatment. The mixed fibers after carding are continuously laid on the mesh belt conveyed by the conveying drum. The bottom of the mesh belt is equipped with a blower, and the mixed fibers are adsorbed on the mesh belt by suction. For transportation, adjust the speed of the mesh belt to control the laying thickness of the mixed fibers to make a fluffy fiber mesh; Step 3: Send the fiber mesh into an oven for thermal drying treatment, and the oven temperature is set to 80~120℃ to make chemical fibers Form a molten state; Step 4: Use a roller to heat the fibrous mesh after passing through the oven to weld and combine chemical fibers, and roll and shrink the thickness of the fibrous mesh to form a fibrous mesh sheet; Step 5. Layers or layers of overlapping fiber mesh panels are placed in the mold, and then pressurized and heated with the mold, so that the chemical fibers of the fiber mesh panels are thermally bonded and combined with natural fibers to produce composite materials molded objects. The temperature is 120~250℃, the hot pressing pressure is above 0.3MPa, the final density after hot pressing is 0.8~1.2g/cm ³ , the hot pressing time is more than 3 minutes, and the final object is cooled and shaped. The method for manufacturing a natural fiber and chemical fiber composite sheet molded object as described in item 1 of the scope of the patent application, wherein the natural fiber in the step one includes raw bamboo fiber, hemp fiber, coconut palm fiber, palm fiber, coconut fiber, jute One or more of, sisal, ramie, flax, chemical fiber is hot-melt fiber. As described in the first item of the scope of patent application, the natural fiber and chemical fiber composite sheet forming object manufacturing method, wherein the weight mixing ratio of the natural fiber and the chemical fiber in the step 1 is 8:2~2:8. As described in item 3 of the scope of patent application, the natural fiber and chemical fiber composite sheet forming object manufacturing method, wherein the weight mixing ratio of natural fiber and chemical fiber in the first step is 6:4 to 4:6. The method for manufacturing a natural fiber and chemical fiber composite sheet molded object described in the first item of the scope of the patent application, wherein the mixed fiber of the step 1 is opened again through a cotton opener to make the natural fiber and the chemical fiber uniformly mixed. The method for manufacturing a natural fiber and chemical fiber composite sheet molded object described in item 1 of the scope of patent application, wherein the thickness of the fiber mesh sheet in the fourth step is 10-30 mm, and the fiber mesh sheet is rolled by a cloth winder take. According to the method for manufacturing a natural fiber and chemical fiber composite sheet molded object described in the first item of the scope of patent application, the hot pressing pressure in the step 5 is 0.5-4 MPa, and the hot pressing time is 4-8 minutes. As described in the first item of the scope of patent application, the method for manufacturing a natural fiber and chemical fiber composite sheet formed object, wherein the step 5 adopts breathing hot pressing, in which heat pressing and pressure relief are performed multiple times in a staggered manner. According to the method for manufacturing a natural fiber and chemical fiber composite sheet molded object described in item 1 of the scope of the patent application, the final density of the object in the fifth step is 0.9-1.1 g/cm ³ . The method for manufacturing a natural fiber and chemical fiber composite sheet molded object as described in item 1 of the scope of the patent application, wherein the natural fiber content in step 1 is respectively related to the thickness of the fiber mesh sheet in step 4 and the hot pressing pressure in step 5 , Hot pressing time is proportional.