Means for joining flexible fastener strips to film

Apparatus for attaching prefabricated bag making plastic film to prefabricated resiliently flexible fastener strips, comprising:

• means for folding a continuously travelling plastic film and for guiding opposite folded panels convergently toward one another and into face-to-face contiguity;
• means for delivering into the convergence of said panels separably interlocked fastener profile strips having oppositely facing base surfaces engaged by the respective panels;
• and means for applying to said base surfaces adhesive at a location in advance of engagement of said surfaces by said film panels so that the film panels are adhesively secured to the strip base surfaces at said convergence at which said interlocked fastener strips are sandwiched between said panels;
• said means for applying said adhesive comprising respective adhesive applicator nozzles which are offset relative to one another in the direction of advance of the web panels and the interlocked fastener strips, so that in applying hot adhesive, the heat from the adhesive applied by the respective nozzles will not be concentrated but will be spaced longitudinally along the strips.

Apparatus for attaching to a prefabricated flexible web a first prefabricated flexible separable fastener strip having an interlocking profile adapted for interlocking with a complementary second flexible separable fastener profile, comprising:

• means for moving the web and the fastener strip at high speed and substantially continuously convergently toward one another to join interface surface areas of the web and fastener strip;
• means for substantially continuously applying a thin layer of quickly tacky adhesive to at least one of said interface surface areas and as close as practicable to the convergent joining of the web and strip so that the adhesive will reach the joining while tacky;
• means for effecting attachment of the interface surface areas to one another by means of the adhesive layer while the web and fastener strip continue jointly in said high speed movement;
• means for folding said web along a longitudinal axis to form two plies and for guiding the two plies convergently toward one another and toward said fastener strip and a second fastener strip separably interengaged with said first mentioned fastener strip, said means for effecting attachment pressing the respective interface surface areas of the plies against the interface surface areas of the fastener strips, and said means for applying adhesive being duplicated to apply a thin layer of the quickly tacky adhesive to at least one of each of the interface surface areas of said respective strips and plies;
• said means for applying said adhesive comprising respective adhesive applicator nozzles which are offset relative to one another in the direction of advance of the web plies and the strips,
• and means located in association with said strips intermediate said adhesive applying nozzles for deflecting said strips and substantially removing the strips from the adhesive application field of said nozzles when said means for moving stops.

Apparatus for attaching to a prefabricated flexible web a first prefabricated flexible separable fastener strip having an interlocking profile adapted for interlocking with a complementary second flexible separable fastener profile, comprising:

• means for moving the web and the fastener strip at high speed and substantially continuously convergently toward one another to join interface surface areas of the web and fastener strip;
• means for substantially continuously applying a thin layer of quickly tacky adhesive to at least one of said interface surface areas and as close as practicable to the convergent joining of the web and strip so that the adhesive will reach the joining while tacky;
• means for effecting attachment of the interface surface areas to one another by means of the adhesive layer while the web and fastener strip continue jointly in said high speed movement;
• means for folding said web along a longitudinal axis to form two plies and for guiding the two plies convergently toward one another and toward said fastener strip and a second fastener strip separably interengaged with said first mentioned fastener strip, said means for effecting attachment pressing the respective interface surface areas of the plies against the interface surface areas of the fastener strips, and said means for applying adhesive being duplicated to apply a thin layer of the quickly tacky adhesive to at least one of each of the interface surface areas of said respective strips and plies;
• said fastener strips having spaced apart confronting profile carrying surfaces at opposite sides of said interengaged profiles;
• guiding means for the fastener strips comprising plates having spaced edges extending from respective opposite sides between said spaced surfaces of the strips and the plates being in sufficient gap relation to one another to clear the interengaged profile strips to pass longitudinally through the gap;
• and means supporting said plates and adapted to actuate said plates for effecting deflection of the strips relative to said adhesive applying means when said means for moving stops.