Patent Application
20170107671
The present invention relates to a pulp product manufacturing method and, in particular, to a method for manufacturing a right-angled pulp product.
A pulp product is made from cellulose fibers such as bamboo slurry or sugar cane slurry. Such plants have a short growth period, so planned planting can be accomplished, and an environmental impact is greatly reduced. The pulp product has excellent mouldability, so unlike paper products which have many restrictions on package designs, the pulp products can be produced in various shapes, and it is not necessary to adhere plastic onto the pulp products. A manufacturing process of the pulp product has a low carbon dioxide release rate, and the material can be recycled and reused completely, which meets the global environmental-friendly trend. Therefore, the pulp products are valued and adopted by industries and the public.
In recent years, the cellulose pulp products are extensively used, such as tableware, containers, packages, and especially degradable products. In manufacturing the cellulose pulp products, a mold is immersed in a pulp container. Pulp consisting of cellulose fibers is in a slurry form, so the pulp is easily drawn toward a mold having a plurality of suction holes and a metal screen on a surface of the mold, and then the pulp covers an outer surface of the metal screen, which is so called a mold-taking-pulp process.
After the mold has a sufficient amount of the pulp, the mold is removed from the pulp container and a mold combination dewatering process is performed to reduce moisture. When the moisture is reduced, a pressing and heat-drying process is performed. After the pulp in the mold is dried, a pulp product can be taken out (released from the mold). During the mold pressing or heat-drying process, the pressing force is in one direction only, i.e. a downward direction. Since the force cannot be applied to the lateral sides of the pulp, the following problems occur: 1. A base plate and side plates of the pulp product are of uneven density and thickness. 2. In a mold release process, it requires a draft angle to release the pulp product smoothly from the mold, so the pulp product cannot form a right angle at bends of the pulp product.
Accordingly, the inventor made various studies to improve the above-mentioned problems in the conventional manufacturing process, on the basis of which the present invention is accomplished.
It is an object of the present invention to provide a method for manufacturing a right-angled pulp product with ease.
Accordingly, the present invention provides a method for manufacturing a right-angled pulp product from pulp consisting of a mixture of cellulose fibers. The method includes taking the pulp to form a flat shape, pressing and heat-drying the flat-shaped pulp to form a pulp product having a plurality of troughs, taking out the pulp product, cutting off a burr around the pulp product, applying adhesive onto each of the troughs, and bending two adjacent plates at two sides of each trough to form a right angle and a fixed shape.
The present invention also has the following effects. Since the flat-shaped pulp in one-sheet form is utilized in the pressing and heat-drying process, the pulp product is of even density and thickness. Therefore, it is not necessary to use a mold with a particular draft angle for mold release, and thereby the difficulty in shaping the right angle is overcome. Furthermore, the second mold in a flat shape is utilized in the process of directly pressing and heat-drying the pulp to form the pulp product having the plurality of troughs, so the pulp product has an average density of up to 0.8 to 1 kg/m3, has a bekk smoothness of 6 to 14 seconds, and has an average thickness of 2 to 4 millimeters.
The disclosure will become more fully understood from the detailed description and the drawings given herein below for illustration only, and thus does not limit the disclosure, wherein:
Detailed descriptions and technical contents of the present invention are illustrated below in conjunction with the accompany drawings. However, it is to be understood that the descriptions and the accompany drawings disclosed herein are merely illustrative and exemplary and not intended to limit the scope of the present invention.
Referring to
Referring to
Since the flat-shaped pulp in one-sheet form is utilized in the pressing and heat-drying process, the pulp product is of even density and thickness, and two sides of the pulp product in one-sheet form are smooth. Therefore, it is not necessary to use a mold having a particular draft angle for mold release, and the difficulty in shaping the right angle is overcome.
Furthermore, the second mold in a flat shape is utilized in a process of directly pressing and heat-drying the pulp to form the pulp product having the plurality of troughs, so the pulp product has an average density of up to 0.6 kg/m3 or above, has a bekk smoothness of 6 to 14 seconds, and has an average thickness of 2 to 4 millimeters, wherein the average density is preferably 0.8 to 1 kg/m3, and the average thickness is preferably 3 millimeters.
It is to be understood that the above descriptions are merely the preferable embodiment of the present invention and are not intended to limit the scope of the present invention. Equivalent changes and modifications made in the spirit of the present invention are regarded as falling within the scope of the present invention.
