Composite, molded body, and method for producing molded body

Abstract

Provided are: a composite which can be suitably used in the production of a molded body having a desired shape even with little water being imparted while suppressing the use of a petroleum-derived material; a molded body; and a method for producing a molded body. The molded body has a desired shape while suppressing the use of a petroleum-derived material, and the method for producing the molded body can be suitably applied to the production of the molded body. This composite contains fibers and starch, at least a part of the starch is fused with the fibers, and the weight-average molecular weight of the starch is 40,000-400,000 (inclusive). The method for producing a molded body according to the present invention comprises: a molding raw material preparing step of preparing a molding raw material containing fibers and starch that has a weight-average molecular weight of 40,000 or higher and 400,000 or lower, a humidifying step of humidifying the molding raw material, and a molding step of molding the molding raw material into a predetermined shape by heating and pressurizing the molding raw material.

Description

technical field [0001] The invention relates to a composite body, a molded body and a method for manufacturing the molded body. Background technique [0002] As a method for producing a sheet-like or film-like molded article using a fibrous substance, there is a papermaking method using water. [0003] In such a papermaking method, fibers are entangled with each other by causing a bonding force such as a hydrogen bond to act between the fibers, thereby exerting the bonding force, thereby obtaining sufficient strength in the molded article. [0004] However, such a manufacturing method needs to use a large amount of water, and in addition, dehydration, drying, etc. are required in the production process, and a lot of energy and time are required for this. In addition, the used water needs to be properly treated as waste water. In addition, most of the devices used in the paper-making method require large-scale public facilities and infrastructure such as water, electricity,...

AI Technical Summary

Problems solved by technology

[0009] Although it is preferable to use natural materials derived from plants in order to meet the above-mentioned requirements, in the invention described in Patent Document 1, if only natural materials are used If synthetic resin is used instead of synthetic resin, sufficient adhesion cannot be obtained, making it difficult to make the strength of the sheet sufficiently excellent

In addition, when natural materials are used instead of synthetic resins, there are usually problems such as a decrease in processability and the need to further increase the heating temperature, so it becomes difficult to recycle molded objects.

Images