Continuous hot-pressing method for large-section section

Abstract

The invention discloses a continuous hot-pressing method for a large-section section. The method comprises a pretreatment process, a continuous hot-pressing process and a post-treatment process, and is characterized in that: the continuous hot-pressing process comprises the following steps of: A, preheating and prepressing; B, hot-pressing and curing; and C, cooling to guarantee quality. In the method, a continuous blanking mode is adopted, the preheating and the prepressing are increased, and a microwave or high-frequency heating technology is adopted during hot pressing. By the method, a non-lumber small-diameter class bamboo material, a secondary material of poor quality, a single-plate residual material, saw dust and the like are machined into a high-quality material; and the method has the advantages of wide material sources, simple and convenient material manufacturing process, high utilization rate of the material, convenience of operation, low energy consumption, investment saving and the like. Meanwhile, the method can be used for machining the material with any length in a continuous pressing mode and can also be used for machining the material with the thickness of 500mm.

Description

technical field [0001] The invention relates to the technical field of bamboo and wood processing, in particular to a method for continuously hot-pressing large cross-section profiles. Background technique [0002] Bamboo is considered to be the second largest forest. With its ecological, environmental protection, renewable and fast-growing advantages, it has been paid more and more attention. Bamboo has been used to develop products such as bamboo plywood, bamboo building formwork, bamboo laminated lumber, and bamboo planing. Cut veneer, and newly developed recombined bamboo and many other products in recent years. However, the previous bamboo processing methods only processed bamboo into standard-sized boards or squares. The material has certain limitations in length and thickness. Bamboo’s unique tensile strength and static Flexural strength, elasticity and toughness are not fully utilized. At the same time, many fast-growing woods have been developed in various places ...

AI Technical Summary

Problems solved by technology

The material produced by this method (commonly known as recombined bamboo) adopts cold press clamping and then heat-cures the glue, which solves the problem that traditional wood-based panels cannot be prepared with thick materials (generally, traditional hot-pressed wood-based panels, because of heat conduction problems, the material thickness is below 30mm. ), the material is currently mainly used in flooring, furniture and other fields. Because this method uses molds and is manufactured by high pressure, the mold consumes a lot, because the molecules of high-pressure materials are damaged, and the materials are easy to crack during use and need to be aged for a long time. It can only be used after the stress is removed, which also results in an increase in material costs

[0004] Another example is a patented method for manufacturing bamboo strips into lumber, which is described in patent number ZL200710019222.8: high-frequency heating is used to prepare plates with a relatively large thickness (up to 150mm), but this method cannot be quickly assembled into billets. Good solution to the uniformity problem. It is difficult to feed in and out of the slab when pressing the material, and once the press is finalized, it cannot make longer-sized materials, and the equipment cost is high, and industrial applications also have certain limitations.

The existing MDF continuous press mainly adopts roller steel belt, the thickness of the processed material is relatively thin, and the use of the material is limited

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