Plastic zipper having preventing function against unfairly unsealing, and the manufacturing method and manufacturing appartus thereof

Abstract

In a plastic zipper 1 having a pair of engaging portions 1 A and 1 B formed on surfaces of plastic films F, a plastic zipper having preventing function against unfairly unsealing is provided wherein a tear tape 5 is detachably welded to the top surfaces at mouth side of the plastic zipper in a longitudinal direction of the plastic zipper, and thus, it can be ascertained at a glance that it is unsealed unfairly or erroneously. The plastic zipper is guided between two guide rails 3 A and 3 B, disposed in parallel to each other and forming a space therebetween, and pairs of guide rollers 2 A and 2 B, and a tear-tape having easily peelable plastic layer formed on one surface thereof is guided to the space between the guide rails 3 A and 3 B, and then, both of them are welded together by hot stamping by means of a heating member.

1 . An apparatus for manufacturing a plastic zipper having preventing function against unfairly unsealing characterized in that:
 two long and slender guide rails are disposed in parallel to each other so as to guide outer surfaces located at an open end of the plastic zipper which has a pair of engaging portions and which is located on surfaces of plastic films;   multiple sets of guide rollers, a set of which consists of two pieces of rollers, are disposed facing to said guide rails so as to sandwich the plastic films located at contents side and near the engaging portions of the plastic zipper, an axis of each guide roller being positioned perpendicular to the guide rails, a heating member is disposed facing to a space formed between the two guide rails at a position opposite to the guide rollers relative to the guide rails; and   a moving means for causing approaching and departing movements to said heating member relative to the guide rails is disposed so as to heat up the top surface located at the mouth side of the plastic zipper.   
   
   
       2 . An apparatus for manufacturing a plastic zipper having preventing function against unfairly unsealing characterized in that:
 two long and slender guide rails are disposed in parallel to each other so as to guide outer surfaces located at an open end of the plastic zipper which has a pair of engaging portions and which is located on surfaces of plastic films;   multiple sets of guide-rollers, a set of which consists of two pieces of rollers, are disposed facing to said guide rails so as to sandwich the plastic films located at contents side and near the engaging portions of the plastic zipper, an axis of each guide roller being positioned perpendicular to the guide rails, a heating member is disposed facing to a space formed between the two guide rollers at a position opposite to the guide rollers relative to the guide rails;   a moving means for causing approaching and departing movements to said heating member relative to the guide rails is disposed so as to heat up the top surface located at the mouth side of the plastic zipper; and   a tear tape supply device for supplying a tear tape into the space formed between the guide rails is disposed.   
   
   
       3 . An apparatus for manufacturing a plastic zipper having preventing function against unfairly unsealing according to  claim 1 , characterized in that said heating member is a plate member having an edge parallel to the guide rails, and a fringe of said edge is straight or uneven. 
   
   
       4 . An apparatus for manufacturing a plastic zipper having preventing function against unfairly unsealing according to  claim 1 , characterized in that said heating member is a rotatable circular disk, and said circular disk has a rotating axis perpendicular to the longitudinal direction of guide rails and to the moving direction of the heating member. 
   
   
       5 . An apparatus for manufacturing a plastic zipper having preventing function against unfairly unsealing according to  claim 1 , characterized in that said two guide rails are provided with at least one connecting portion, by which they are connected to each other, at the side of said heating member. 
   
   
       6 . A method for manufacturing a plastic zipper having preventing function against unfairly unsealing characterized in that:
 supplying a plastic zipper, which has a pair of engaging portions and which is located on surfaces of plastic films, to two long and slender guide rails disposed forming a space therebetween and in parallel to each other and to multiple sets of guide rollers, a set of which consists of two pieces of rollers, disposed facing to said guide rails so as to guide outer surfaces located at an open end of the plastic zipper into the space located between said guide rails and so as to sandwich the plastic films located at contents side and near the engaging portions of the plastic zipper by means of said sets of guide rollers;   stopping movement of the plastic zipper in a sandwiched condition; and   hot stamping and detachably welding the top surfaces located at the mouth side of the stopped plastic zipper by means of a heating member having an edge parallel to the guide rails.   
   
   
       7 . A method for manufacturing a plastic zipper having preventing function against unfairly unsealing characterized in that:
 supplying a plastic zipper, which has a pair of engaging portions and which is located on surfaces of plastic films, and a tear tape having easily peelable plastic layer formed on one surface thereof to two long and slender guide rails disposed forming a space therebetween and in parallel to each other and to multiple sets of guide rollers, a set of which consists of two pieces of rollers, disposed facing to said guide rails, said easily peelable plastic layer of said tear tape being supplied in a condition wherein it is capable of in contact with the top surfaces located at the mouth side of the plastic zipper;   guiding the outer surfaces located at an open end of the plastic zipper into the space located between said guide rails, and guiding said tear tape into said space, and at the same time, sandwiching the plastic films located at contents side and near the engaging portions of the plastic zipper by means of said sets of guide rollers;   stopping movement of the plastic zipper and the tear tape in a sandwiched condition;   inserting a heating member having an edge parallel to the guide rails into said space between said guide rails; and   hot stamping the top surfaces located at the mouth side of the stopped plastic zipper and said tear tape by means of a heating member so as to detachably weld the top surfaces located at the mouth side of the plastic zipper with said easily peelable plastic layer of said tear tape.   
   
   
       8 . A method for manufacturing a plastic zipper having preventing function against unfairly unsealing characterized in that:
 supplying a plastic zipper, which has a pair of engaging portions and which is located on surfaces of plastic films, to two long and slender guide rails disposed forming a space therebetween and in parallel to each other and to multiple sets of guide rollers, a set of which consists of two pieces of rollers, disposed facing to said guide rails so as to guide outer surfaces located at an open end of the plastic zipper into the space located between said guide rails and so as to sandwich the plastic films located at contents side and near the engaging portions of the plastic zipper by means of said sets of guide rollers; and   hot stamping and detachably welding the top surfaces located at the mouth side of the stopped plastic zipper by means of a rotatable heated circular disk having a rotating axis perpendicular to the longitudinal direction of guide rails and to the moving direction of the heating member while the plastic zipper is moving.   
   
   
       9 . A method for manufacturing a plastic zipper having preventing function against unfairly unsealing characterized in that:
 supplying a plastic zipper, which has a pair of engaging portions and which is located on surfaces of plastic films, and a tear tape having easily peelable plastic layer formed on one surface thereof to two long and slender guide rails disposed forming a space therebetween and in parallel to each other and to multiple sets of guide rollers, a set of which consists of two pieces of rollers, disposed facing to said guide rails, said easily peelable plastic layer of said tear tape being supplied in a condition wherein it is capable of in contact with the top surfaces located at the mouth side of the plastic zipper;   guiding the outer surfaces located at an open end of the plastic zipper into the space located between said guide rails, and guiding said tear tape into said space, and at the same time, sandwiching the plastic films located at contents side and near the engaging portions of the plastic zipper by means of said sets of guide rollers;   inserting a rotatable heated circular disk having a rotating axis perpendicular to the moving direction of the heating member into said space between said guide rails; and   hot stamping the top surfaces located at the mouth side of the plastic zipper and said tear tape by means of said heated circular disk while the plastic zipper and the tear tape are moving so as to detachably weld the top surface located at the mouth side of the plastic zipper and said easily peelable plastic layer of said tear tape.   
   
   
       10 . In a plastic zipper having a pair of engaging portions formed surfaces of plastic films, the plastic zipper having preventing function against unfairly unsealing characterized in that a tear tape is disposed in a longitudinal direction of the plastic zipper at mouth side of the plastic zipper, the tear tape being different from the plastic films and having easily peelable layer formed on one side thereof, the tear tape is detachably adhered to the top surfaces of the plastic zipper at the mouth side thereof via the easily peelable layer. 
   
   
       11 . A plastic zipper having preventing function against unfairly unsealing according to  claim 10 , characterized in that the width of the detachable tear tape is in a range between not less than 0.5 mm and the amount which is obtained by adding 4 mm to the thickness of the zipper. 
   
   
       12 . A plastic zipper having preventing function against unfairly unsealing according to  claim 10 , characterized in that the detachable tear tape has slits spaced in a longitudinal direction thereof by cutting from a side edge thereof. 
   
   
       13 . A plastic zipper having preventing function against unfairly unsealing according to  claim 12 , characterized in that the slits of said tear tape is formed in a state wherein they are cut obliquely towards a closed end of the plastic zipper. 
   
   
       14 . A plastic zipper having preventing function against unfairly unsealing according to  claim 10 , characterized in that the detachable tear tape is welded along a dotted line extending in a longitudinal direction of the plastic zipper. 
   
   
       15 . A plastic zipper having preventing function against unfairly unsealing according to  claim 10 , characterized in that the plastic zipper is equipped with a slider. 
   
   
       16 . A bag body equipped with a plastic zipper having preventing function against unfairly unsealing according to  claim 10 , characterized in that the plastic zipper is fitted at a mouth portion of the bag.