Composite lawn edging

A - Human Necessities – 01 – G

Patent

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Details

A01G 1/08 (2006.01) A01G 25/02 (2006.01) B29C 47/00 (2006.01)

Patent

CA 2256685

The lawn edging (10) is formed by extruding a thermoplastic resin, preferably a thermoplastic resin such as polyethylene containing a dispersion of prevulcanized elastomer granules through a die (62) having a vertical die orifice (64) for forming the wall (12) of the channel (16). The vertical die orifice (64) also contains an element for forming protrusions (20) on a surface of the wall (12). The element preferably forms a horizontal edge on the protrusion (20). The feed rate of the element can be higher than the adjacent sections of the wall (12) such that the extruded material backs up in the die (62) and intermittently feeds through the outlet orifice (64). The channel (16) can contain a lower bead (34) and an upper hollow head member (14) which can be coated with a liquid impervious film (100) and perforated by a laser (120) to form spray apertures (122).

Une bordure de pelouse composite est formée par extrusion d'une résine thermoplastique (de préférence une résine thermoplastique telle qu'un polyéthylène contenant une dispersion de granules d'élastomère prévulcanisée) à travers une matrice pourvue d'un orifice vertical pour façonner la paroi du canal d'écoulement. L'orifice vertical de la matrice contient aussi un élément servant à former des protubérances sur une surface de la paroi. Ledit élément forme, de préférence, un bord horizontal sur la protubérance. Le taux d'alimentation dudit élément peut être supérieur à celui des sections adjacentes de la paroi, de sorte qu'un matériau extrudé reflue dans la matrice et avance par intermittence à travers l'orifice de sortie. Le canal d'écoulement peut comprendre une tête inférieure et un élément d'une tête supérieure creuse pouvant être revêtu d'une couche imperméable au liquide et perforé par laser pour former des trous de pulvérisation.

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