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「以下の特許文献１には、不織布の片面又は両面に、アンダーコート層を介し、合成樹脂を３～２０ｇ／ｍ2塗布した印刷用媒体が提案されているが、塗工時の樹脂の染み込み、表面の凹凸などに問題がある。」









翻訳例

Patent Literature 1 below proposes a printing medium in which a synthetic resin is applied to one or both sides of a nonwoven fabric in an amount of 3 to 20 g/m2 via an undercoat layer, but there are problems related to resin penetration during application and surface irregularities.



解説
The term “凹凸” can have a large number of different translations depending on the context. In the case of a printing medium, as in the current text, “irregularities” is most appropriate, though other terms, such as unevenness, roughness, etc., can be considered.