Container Sealing Machine for Food Packaging

Abstract

A sealing machine for a fresh-keeping and cooking container is provided. The sealing machine includes a lidding-film processing unit, a bonding unit, and a heat-sealing unit. The lidding-film processing unit includes die cutters and hot needles for forming line-segment-shaped, spaced slits and dot-shaped atmosphere-modifying breathing holes on a surface of a lidding film passing through the lidding-film processing unit. The processed lidding film then enters the bonding unit and is bonded with an airtight sealing strip whose bottom is provided with adhesive. Afterward, the lidding film bonded with the sealing strip enters the heat-sealing unit so as to cover an opening of a container and be heat-sealed to a heat-sealable rim of the opening. Thus, the lidding film is processed and sealed to the container in a continuous manner to simplify sealing of the container and removal of scraps cut from the used lidding film.

1 . A sealing machine for a fresh-keeping and cooking container, the sealing machine comprising a lidding-film processing unit, a bonding unit for bonding an airtight sealing strip to a lidding film, and a heat-sealing unit for covering an opening of the container with the lidding film;
 wherein, in the lidding-film processing unit, the lidding film is unwound and extended downward to a table from a roll of the lidding film, and a perforating assembly at the table is actuated to form line-segment-shaped, spaced slits or dot-shaped atmosphere-modifying breathing holes at predetermined positions on a surface of the lidding film passing through the lidding-film processing unit;   wherein, as the processed lidding film enters the bonding unit, the airtight sealing strip is unwound and extended downward from a roll of the airtight sealing strip above a table of the bonding unit and is laid over the lidding film passing through the bonding unit such that the line-segment-shaped, spaced slits formed on the lidding film are covered, the airtight sealing strip, whose bottom is provided with adhesive, being bonded to the lidding film via a hot-press sealing assembly at the table of the bonding unit;   wherein, as the lidding film bonded with the airtight sealing strip enters the heat-sealing unit configured for sealing the opening of the container, the container, which contains frozen or refrigerated food and is placed in a supporting frame of a table of the heat-sealing unit, is covered by the lidding film passing through the heat-sealing unit, and the lidding film covering the container is sealed to a heat-sealable rim of the opening of the container via a heat-sealing assembly at the table of the heat-sealing unit while scraps cut from the used lidding film are wound around a rewinding spool at an opposite end of the heat-sealing unit; and   wherein the lidding film covering the opening of the container is processed and sealed to the container in a continuous manner to effectively simplify sealing of the container and removal of the scraps cut from the used lidding film.   
     
     
         2 . The sealing machine of  claim 1 , wherein the perforating assembly of the lidding-film processing unit comprises hot needles. 
     
     
         3 . The sealing machine of  claim 1 , wherein the perforating assembly of the lidding-film processing unit comprises die cutters configured for forming the line-segment-shaped, spaced slits. 
     
     
         4 . The sealing machine of  claim 1 , wherein the perforating assembly of the lidding-film processing unit comprises hot needles and die cutters configured for forming the line-segment-shaped, spaced slits. 
     
     
         5 . The sealing machine of  claim 1 , wherein a protection shield is provided outside and around the perforating assembly of the lidding-film processing unit. 
     
     
         6 . The sealing machine of  claim 1 , wherein a protection shield is provided outside and around the hot-press sealing assembly of the bonding unit of the sealing machine.