An improvement in the wrapping of successive articles in heat-sealable film supplied in a continuous length to an elongated generally tubular former which progressively wraps the film around the sides of the articles and seals the margins together while air is being evacuated from the interior of the wrapping material comprises the provision of a lengthwise slot in the tubular former and placing the vacuum supply pipe outside the former and near the slot so that the articles do not ride on, or come in contact with, this supply pipe. In the preferred form the margins of the film are sealed along a continuous line outside the supply pipe and along a discontinuous on the other side of the pipe so that air evacuation can take place. In a modification, the margins are overlapped and openings are provided near one margin to allow for the removal of air and in another modification the margins are overlapped and two lines of sealing are employed; one being continuous, to seal the wrapping as a whole, the other being discontinuous and on the other side of the pipe to allow for air removal.
A machine and a method for wrapping an elongated object, such as a drinking straw, with a plastic film are disclosed. The machine has a drive for continuously advancing a thin narrow film strip from a supply roll to a wrapper loading and forming station. The wrapper loading and forming station has a trough former for folding the advancing film strip into a film trough. An inserting device positions spaced-apart elongated objects, such as the drinking straws, into the film trough of the advancing film strip for engagement by the film trough. The objects are supplied by a dispenser and disposed in a pre-oriented manner to be grasped by the inserting device. The film trough is advanced through sealing and severing stations wherein individually wrapped elongated objects or straws are produced.
A machine and a method for wrapping an elongated object, such as a drinking straw, with a plastic film are disclosed. The machine has a drive for continuously advancing a thin narrow film strip from a supply roll to a wrapper loading and forming station. The wrapper loading and forming station has a trough former for folding the advancing film strip into a film trough. An inserting device positions spaced-apart elongated objects, such as the drinking straws, into the film trough of the advancing film strip for engagement by the film trough. The objects are supplied by a dispenser and disposed in a pre-oriented manner to be grasped by the inserting device. The film trough is advanced through sealing and severing stations wherein individually wrapped elongated objects or straws are produced.
A wrapped article and a method of packaging it in a wrapper of sealable material includes the steps of surrounding the article about its side faces with the wrapper, providing the wrapper with a longitudinal seam to obtain a wrapper sleeve projecting beyond the end faces; flattening the wrapper sleeve beyond the end faces and providing transverse seams in the wrapper sleeve beyond the end faces to obtain fins projecting therebeyond, folding each fin along a root edge thereof against the respective end face to extend parallel thereto; folding side margins of each fin through 180.degree. along respective side edges onto the fin; and folding an outer edge zone of each fin through 180.degree. along a respective top edge onto a respective end face.
This invention refers to a continuous or intermittent air injection system for enveloping machines consisting in an air tubing comprising suitable air expulsion means, controlled by an electrovalve and equipped with at least two impulsion positions when are the positions confronting the sealed area of the envelope that allows the cooling of the welding, and the upper position which is the corresponding to the stoppage of the machine with the cooling of the thermowelding rollers that permits their temperature regulation and control.
An automatic machine for the continuous production of dual-use filter sachets for infusion products, the filter sachets being in the form of bags or pouches containing successive portions of the products. Along the production line there are a succession of devices designed to effect step by step the longitudinal folding and sealing of a strip of filter paper forming therefrom a horizontally extending flattened tube and for the transverse thermal welding of the tube in a manner such as to enclose said individual dosed fractions. A rotary wheel has pickup elements for applying to the flattened tube equidistantly spaced labels, a longitudinally continuous thread transversely contacting the labels, as well as stickers or tabs weldable by alternate transverse thermal welding partly to the back of the labels. The tube is then sectioned into portions comprising at least two bags and the bags are set back to back and sealed together at their extremities.
