摘要 |
This invention relates to an improved spreading unit for bonding machines which is equipped with recirculation systems that take up adhesive from the base o f the reservoir in contact with the take-up roller and return it to the storage tank, from which it is sent back to the reservoir; this continuous circulation of the product guarantees that the product will maintain the ideal temperature and viscosit y characteristics. In accordance with an advantageous aspect of the invention, the reservo ir containing the adhesive taken up by the rollers is bounded by a pair of doct or blades which define an enclosed area in contact with the roller and are mounted on a sliding support, so that they can be moved away from the roller for cleaning, maintenance and similar operations. The reservoir is positioned at a height calculated so that adhesive is transferred to the reservoir by a calibrated gravity system, without being engaged by mechanical devices, and consequently without producing foam. This guarantees continuous recirculation of adhesive without the risk o f stagnation which could cause a variation in the characteristics of the compound, and above all without foam production. Moreover, in accordance with another advantageous aspect of the invention, t he reservoir is mounted on a skid that slidesalong guides integral with the structure of the machine, so that it can be rapidly distanced from the rollers when required for maintenance or cleaning operations.
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