| 摘要 |
A method of making a rigid structure such as a ladder from one or more lengths of tubing or sections of tubing of a natural fibre material such as paper, includes the steps of assembling the lengths of tubing into the desired structure, impregnating the lengths of tubing with a liquid composition comprising a thermosetting resin such as a phenolic resin, an extending liquid for the thermosetting resin and a catalyst for the thermosetting resin, and polymerising the thermosetting resin to form the structure.
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