| 摘要 |
<p>In a method of producing composite sheet material by forming longitudinal rows of stitches 7 in a paper sheet material 1, the length of paper sheet material 1 used per stitch 7 is increased so that there is entrapped within each stitch 7 in each longitudinal row of stitches 7 a portion of paper sheet material 1 having a length greater than the length of the completed stitch 7. In consequence there are formed in the composite sheet material a longitudinal series of laterally extending corrugations, ridges or ribs 19 which, in the case of a crepe paper sheet material 22, constitute a gross crimp imposed without distortion of the crimps in the initial crepe paper sheet material 22.</p><p>The increase in the length of the sheet material used per stitch may be effected by the action of the needles 9 of the stitching machine to withdraw a greater quantity of sheet material 1 or 22 from a feed roll or the increase in the length may be effected by positively overfeeding the sheet material 1 or 22 provide slack sheet material which is entrapped within the stitches 7 as a result of the needle action.</p><p>The method of the invention may be used when producing composite sheet material by stitching through a plurality of sheets 23, 25 or 27, 28, 30 of sheet material. When there are a plurality of sheet materials the increase in length may be confined to only one or some of the sheet materials or may be provided in all the sheet materials.</p><p>The paper sheet material may be either plain paper or crepe paper or when a plurality of sheet materials are used a pair of either plain or crepe or any combination thereof. </p> |
