Abstract: In a plastic bag including a triangular flap which has a folded hypotenuse and an open hypotenuse, a flow path is formed by the folded hypotenuse or the open hypotenuse to discharge air or gas through the flow path.

Abstract: An apparatus is improved to successively make plastic bags each of which includes an end surface provided with a spout, by employing the general feeding way of panel material, to be simple in structure, low in cost, high in speed and to make it possible to successively make the plastic bags two by two. A first folded portion is formed in a first web of panel material 1. An aperture is formed in a second web of panel material 2. A spout is inserted into the aperture, the spout and the second web of panel material 2 being heat sealed with each other. The second web of panel material 2 is guided by a guide device 18 to be folded after being heat sealed so that a second folded portion should be formed in the second web of panel material. The spout is turned over by the second folded portion. The second folded portion and the first folded portion are heat sealed with each other while the second folded portion and the second web of panel material 2 are heat sealed with each other about the spout.

Abstract: A plastic film punching apparatus is improved to make a waste removed reliably. In the apparatus, a plastic film is sandwiched between and punched by male and female blades. The female blade has opposite surfaces which are first and second surfaces. The plastic film generates a waste which is pushed by the male blade to protrude from the second surface. A vacuum source and an opening cooperate with each other to suck air through the opening and generate airflow within the tubular cover, the waste being removed by the airflow.

Abstract: A first body of fastener material is joined to a first web of panel material while a second body of fastener material is joined to a second web of panel material. The first and second bodies of fastener material are interposed between the first and second webs of panel material and aligned with each other after the first and second webs of panel material are superposed with each other. A third body of fastener material is joined to a web of side gusset material to be interposed between the first and second bodies of fastener material after the first and second webs of panel material are superposed with each other, the first and second bodies of fastener material being aligned with the third body of fastener material.

Abstract: Upon cutting a corner of a plastic bag, the cut-out portion is prevented from attaching to the plastic bag. A plastic film (1) is trimmed by a trimming cutter (7) to form a selvage (8). Every time that the plastic film (1) is intermittently fed, the trimming cutter (7) is moved by a trimming cutter moving mechanism, so that a corner of the plastic bag is cut by the trimming cutter (7) and the cut-out portion (11) is continued from the selvage (8).

Abstract: A plastic film punching apparatus is improved to prevent a waste 15 from being caught in a cylindrical punch blade 2. The apparatus includes a punch blade 2 comprising a saw-toothed edge which includes mountain portions and valley portions formed alternately with each other. A protrusion 5 is disposed internally of the punch blade 2 to protrude beyond the position of height H1 of the bottoms 7 of valley portions and toward the position of height H2 of the tops 6 of mountain portions. An annular clearance 8 is formed between the punch blade 2 and the protrusion 5.

Abstract: A plastic film is drawn by a method different from a conventional one. The plastic film is intermittently fed in the longitudinal direction. A drawing member and a support base are installed in a plastic film feeding path, oppositely to each other, on both sides of the plastic film in the thickness direction. When the plastic film is temporarily stopped, the drawing member advances toward the support base between the lateral both side edges of the plastic film and is pressed against the plastic film and the support base to draw the plastic film in the longitudinal direction. Then, the drawing member retreats from the support base, and is separated from the plastic film.

Abstract: In an apparatus for successively making plastic bags, a receiver plate 5 is fixed to a support plate 7. The support plate 7 extends widthwise of the webs of film material 2H and 2L to protrude on one of opposite sides of the webs of film material 2H and 2L. An elastic support device is disposed on the one side of the webs of film material 2H and 2L to elastically support the receiver plate 5 and the support plate 7. An attitude hold device is disposed on the one side of the webs of film material 2H and 2L to act on the support plate 7 so that the receiver plate 5 and the support plate 7 are held in attitude not to be inclined when being lowered and raised.

Abstract: First and second bodies of fastener material 4 and 5 advance in a first direction which is an advancing direction, the advancing direction being changed into a second direction. A pair of turn over bars 12 and 13 are spaced from each other, the first and second bodies of fastener material 4 and 5 advancing in the first direction to be engaged with the turn over bars 12 and 13. The first and second bodies of fastener material 4 and 5 are then inserted between and turned over by the turn over bars 12 and 13 with the advancing direction being changed into the second direction.

Abstract: A plastic film is drawn by a method different from a conventional one. The plastic film is intermittently fed in the longitudinal direction. A drawing member and a support base are installed in a plastic film feeding path, oppositely to each other, on both sides of the plastic film in the thickness direction. When the plastic film is temporarily stopped, the drawing member advances toward the support base between the lateral both side edges of the plastic film and is pressed against the plastic film and the support base to draw the plastic film in the longitudinal direction. Then, the drawing member retreats from the support base, and is separated from the plastic film.

Abstract: Plastic films are prevented from being peeled off from each other at a joining portion. A composite film has superposed external and internal films and is superposed with an additional body. The films and the body are joined with each other to form a first joining portion between the films, and a second joining portion between the internal film and the body. The first joining portion has a first joining width and includes first outer and inner edges. The second joining portion has a second joining width and includes second outer and inner edges. The first or second joining width is adjusted such that the first joining width is less than the second joining width, with the first inner edge formed outwardly of the second inner edge.