Heat sealing apparatus
First Claim
1. Apparatus for heat sealing in conjunction a pair of plastic strips each having a series of regularly spaced transverse pockets separated by web portions so that the pockets together form chambers, and in which the web portion of each strip extends along at least one longitudinal side edge and is formed therealong with a row of indexing perforations, comprising:
- first and second coacting heat sealing dies each having heating surfaces for heat sealing the strips together intermediate the pockets,series of openings in each of said dies, each opening being adapted to receive one of said pockets with said pocket spaced therewithin, said heating surfaces extending at least partially around each of said openings so as to operate to seal the chambers, formed by the association of the strips, from one another,means for engaging said web portions of said strips for aligning said strips with respect to one another and with respect to said openings, andmeans for introducing cooling fluid into said openings so that it flows over the surfaces of said pockets for cooling said pockets received therein during heat sealing,said dies including heating surfaces separate from the heating surfaces extending around said openings for sealing around said perforations,at least one of said heat sealing dies having at least one locator pin means which enters an indexing perforation in the web of each said strip to align said strips with respect to each other and with respect to said openings.
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0 Petitions
Accused Products
Abstract
A system for heat sealing in conjunction a pair of plastic strips each of having a series of regularly spaced transverse pockets so that the pockets together form chambers separated by webs. The two pocketed strips to be joined are brought together and the strips heat sealed around the pockets to seal the chambers from one another while passing cooling fluid over the pockets so as to avoid distortion or collapse of the pockets.
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Citations
7 Claims
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1. Apparatus for heat sealing in conjunction a pair of plastic strips each having a series of regularly spaced transverse pockets separated by web portions so that the pockets together form chambers, and in which the web portion of each strip extends along at least one longitudinal side edge and is formed therealong with a row of indexing perforations, comprising:
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first and second coacting heat sealing dies each having heating surfaces for heat sealing the strips together intermediate the pockets, series of openings in each of said dies, each opening being adapted to receive one of said pockets with said pocket spaced therewithin, said heating surfaces extending at least partially around each of said openings so as to operate to seal the chambers, formed by the association of the strips, from one another, means for engaging said web portions of said strips for aligning said strips with respect to one another and with respect to said openings, and means for introducing cooling fluid into said openings so that it flows over the surfaces of said pockets for cooling said pockets received therein during heat sealing, said dies including heating surfaces separate from the heating surfaces extending around said openings for sealing around said perforations, at least one of said heat sealing dies having at least one locator pin means which enters an indexing perforation in the web of each said strip to align said strips with respect to each other and with respect to said openings. - View Dependent Claims (2)
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3. Apparatus for heat sealing in conjunction a pair of plastic strips each formed with a series of regularly spaced transverse pockets separated by web portions to form two integral mirror image side-by-side cuvette belts, comprising:
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first and second coacting heat sealing dies each having heating surfaces for sealing the strips together extending around openings adapted to receive said pockets with one said pocket in each opening and each said pocket spaced within the respective opening, means for engaging said web portions of said strips for aligning said strips with respect to one another and with respect to said openings, and means for introducing cooling fluid into said openings so that it flows over the surfaces of said pockets for cooling the pockets received therein during heat sealing, said openings being defined by cavities in said dies and there being provided in the base of each cavity, a central entry aperture for the introduction of cooling fluid and exit apertures adjacent each end for the outflow of the cooling fluid.
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4. Apparatus for heat sealing in conjunction a pair of plastic strips each formed with a series of regularly spaced transverse pockets separated by web portions to form two integral mirror image side-by-side cuvette belts, in which the web portions are formed along each longitudinal edge with a row of indexing perforations, said apparatus comprising:
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first and second coacting heat sealing dies each having heating surfaces for sealing the strips together extending around openings adapted to receive said pockets with one said pocket in each opening and each said pocket spaced within the respective opening, means for engaging said web portions of said strips for aligning said strips with respect to one another and with respect to said openings, and means for introducing cooling fluid into said openings so that it flows over the surfaces of said pockets for cooling the pockets received therein during heat sealing, said sealing dies including heating surfaces for sealing around said perforations, and said aligning means including a plurality of locator pins which each enter an indexing perforation in the web portion of each strip. - View Dependent Claims (5, 6, 7)
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Specification