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Apparatus for sealing the overlapping edges of a tubular film

A film and edge technology, applied in the field of airtight heat sealing device, can solve the problem of package damage

Inactive Publication Date: 2008-01-09
A W A X PROGETTZIONE E RICERCA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The seal formed on the longitudinal edges of the film must be very strong and absolutely airtight; and it must have the elasticity to return to its original shape without deflecting the stretched part acting on the film; it cannot form a hard bead, because in When the packages are stacked together, such curling may come into contact with the package, causing damage to the package; moreover, these seals must also be aesthetically pleasing

Method used

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  • Apparatus for sealing the overlapping edges of a tubular film
  • Apparatus for sealing the overlapping edges of a tubular film
  • Apparatus for sealing the overlapping edges of a tubular film

Examples

Experimental program
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Embodiment Construction

[0018] Figure 5 shows a machine for unwinding a stretch film 5 from a stock roll with the help of rollers 27, 127; the film is then inserted into a horizontal mandrel 1 supported by a member 101 so that A packaging tube 5' is formed which is hermetically sealed along the longitudinal overlapping edges by a lower part 6; the front end of said packaging tube is grasped and closed by a transverse clamp 7, thus forming a double seal and a central slit; the product P to be packaged is inserted into the mandrel that makes the film into a tube through a tubular guide 1' supported by a part 14 and a push rod 4, and the tubular guide 1' and push rod 4 The rod 4 is used to introduce the product into said tubular package at a short distance relative to its closed end held by a transverse clamp 7 which is moved horizontally away from the forming mandrel . When the tubular package containing the product has moved a sufficient distance relative to the forming mandrel, the distance is propo...

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Abstract

The apparatus comprises means ( 31, 33 ) for guiding and for holding the longitudinal edges of the film to be sealed so that they overlap with an intimate and distributed contact and comprises in an opposing position, a short distance from these guide means, a sealing head ( 6 ) made in good thermal insulator and with a low coefficient of friction in relation to the film, which directs onto the said film jets of hot air at an appropriate temperature and an appropriate pressure, through longitudinal slits of appropriate dimensions ( 35 ). The sealing head is connected to supply and control means ( 39 - 44 ) that keep it fully operational or have it promptly fully operational, the head being mounted on means ( 45 ) for moving it rapidly towards or away from the film to be sealed.

Description

technical field [0001] The invention relates to a device for continuous hermetic heat sealing of the longitudinally overlapping edges of a tubular element made of a thermoplastic film of finite thickness. Background technique [0002] This device is especially suitable for use on machines that can pack products into stretched film with a barrier effect, as described in the applicant's patent applications GE2001A-96 and BO2002A-410, which are hereby incorporated by reference in their entirety come. [0003] In such machines, the technical problem that must be solved consists in the need for a continuous longitudinal hermetic sealing of the overlapping edges of the packaging film as it passes over the tubular mandrel. But currently on the market or in the prior art, still can't find a kind of device that can solve this technical problem. It should be understood that the film used should have the following characteristics: good adhesion, high ductility and a limited thickness...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B65B51/20B65B51/26B29C65/10B65B51/10B29C53/50
CPCB65B51/20B29C66/4322B29C66/1122B29C66/849B29C65/10B29C66/4312B65B51/26B29C66/81265B29C66/49B29C66/93441B29C66/73921B29C66/81821
Inventor 雷纳托·里蒙迪
Owner A W A X PROGETTZIONE E RICERCA