JP2005204793A - Slide only for closing and plastic film bag with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a slide only for closing where closing force and suspending and fixing force to a zipper provided at the opening part of a plastic film bag is not deteriorated and which slides well, and to obtain the plastic film bag provided with the slide. <P>SOLUTION: Regarding the slide only for closing the plastic film bag, at least one edge is made to be the opening part, and the zipper consisting of a projecting part and a recess part which can engage with and disengaged from each other is provided on the opposing inner surfaces of a pair of flap parts positioned at the opening part. The slide is formed of plastic material and is provided with at least: a pair of side leg pieces 31 and 31 positioned outside of a flap part; an inner leg piece 35 positioned inside of the flap part and having a length which never reaches the zipper; and a pair of projecting parts 32 and 32 formed extending in a direction orthogonal to the zipper so as to oppose insides of the pair of side leg pieces 31 and 31. The pair of projecting parts 32 and 32 are respectively nearly semicylindrical, and their radius is set to be shorter than the width of the recess part of the zipper. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to a closing-only slider, and more particularly to a slider used for closing a zipper provided at an opening of a plastic film bag, and a plastic film bag including the slider.

  Conventionally, a bag 1 shown in FIG. 9 is known as a plastic film bag. The bag 1 is formed by welding a plastic film and cutting or cutting the side portion thereof, and can be fitted / released to / from the inner surfaces of the pair of flap portions 3 and 3 located in the opening portion 2. A zipper 8 including a concave portion 8a and a convex portion 8b is provided. There are various structures and shapes of the uneven portions 8a and 8b of the zipper 8.

  To open and close the zipper 8 of this type of plastic film bag 1, (1) pinch the flaps 3 and 3 with your fingers and perform the closing operation with a dedicated slider. (2) slide in one direction. There are three methods: using an open / close slider that closes and opens by sliding in the other direction (see Patent Document 1), and performing opening and closing with a finger.

  An example of a closing-only slider used in the method (1) is shown in FIG. The closing slider 10 includes a pair of side leg pieces 11 and 11 located outside the flap parts 3 and 3 and a middle leg that is located inside the flap parts 3 and 3 and does not reach the zipper 8. And a piece 15. When the slider 10 is slid in either direction (see the directions of arrows A and A ′ in FIG. 9), the protrusions 12 and 12 formed facing the inner sides of the side leg pieces 11 and 11 The parts 8a and 8b are pressed and fitted to each other.

  The middle leg piece 15 functions as a stopper that prevents the slider 10 itself from detaching laterally when the slider 10 reaches the end 2a of the opening 2. The protrusions 13 and 13 formed on the lower portions of the side leg pieces 11 and 11 prevent the slider 10 from coming off upward. Further, the protrusions 14 and 14 formed on the middle step portion of the inner surfaces of the side leg pieces 11 and 11 that are opposed to each other are for preventing the slider 10 from moving downward more than necessary.

  By the way, in this kind of slider 10, the same shape must be maintained for a long time in a state where the uneven portions 8a and 8b of the zipper 8 are strongly sandwiched. That is, when time elapses in a state where the side leg pieces 11, 11 are spread outwards by losing the repulsive force of the zipper 8, the side leg pieces 11, 11 are deformed into the widened shape, The pinching force (closing force) is weakened. Moreover, the force (holding force) that cannot be removed from the flap portions 3 and 3 of the bag 1 is eliminated, and the bag 1 is easily detached.

Such a problem is considered to be caused by the fact that the width of the protrusions 12 and 12 which are the portions that press contact with the back surfaces of the concavo-convex portions 8a and 8b of the zipper 8 is large and contacts the zipper 8 on the surface. Further, the surface contact of the protrusions 12 and 12 with the bag 1 is also a cause of hindering the sliding of the slider 10.
Japanese Patent No. 2871671

  Accordingly, an object of the present invention is to provide a closing dedicated slider that does not deteriorate the closing force and the suspension force with respect to the zipper provided at the opening of the plastic film bag and has good sliding, and the slider. It is to provide a plastic film bag.

  In order to achieve the above-described object, the closing dedicated slider according to the present invention has at least one side as an opening, and the protrusions that can be fitted / released to each other on the inner surfaces facing each other of the pair of flaps located in the opening. A plastic film bag closing slider provided with a zipper comprising a portion and a recess, wherein the slider is formed from a plastic material and includes at least a pair of side leg pieces positioned outside the flap portion. The middle leg piece, which is located inside the flap portion and does not reach the zipper, and the zipper extends in a direction orthogonal to the inside of the pair of side leg pieces. A pair of protrusions, each of the pair of protrusions being substantially semi-cylindrical and having a radius smaller than the width of the recess of the zipper.

  In the closing-only slider according to the present invention, the pair of protrusions formed on the inner side of the side leg pieces are in pressure contact with the back side of the uneven portion of the zipper, and the uneven portion of the zipper is fitted. The protrusion has a substantially semi-cylindrical shape with a radius smaller than the width of the recess of the zipper, and the apex of the protrusion presses against the back side of the uneven portion with a very small area. Therefore, the apex portion of the protrusion will bite into the back side, and the side leg piece will not be deformed outward due to the repulsive force of the zipper, and the initial closing force and suspension force will be maintained for a long period of time. be able to. Moreover, since the protrusion contacts the bag with a small area at the apex, the slider itself slides well.

  The plastic film bag according to the present invention is characterized by comprising the above-mentioned closing-dedicated slider, which can maintain the initial closing force and suspension force over a long period of time and has good sliding with respect to the bag body. The advantages are fully demonstrated.

  Embodiments of a closing-only slider and a plastic film bag having the slider according to the present invention will be described below with reference to the accompanying drawings.

  1 to 4 show an embodiment of a closing-only slider according to the present invention. The closing slider 30 basically has the same configuration as the conventional closing slider 10 shown in FIG. 10, and a zipper 8 provided in the opening 2 of the plastic film bag 1 shown in FIG. It is provided with a function of closing and further has a function of maintaining a strong clamping force as will be described in detail below.

  Specifically, the closing dedicated slider 30 is integrally formed from a plastic material such as polystyrene or polypropylene, and is a pair of flaps 3 and 3 located outside the opening 2 of the plastic film bag 1. Side leg pieces 31, 31 and middle leg pieces 35 that are located inside the flap portions 3, 3 and do not reach the zipper 8 are provided.

  By the way, the flap parts 3 and 3 have an aspect mainly shown in FIG.5 and FIG.6. In the plastic film bag 1 shown in FIG. 5, the upward extending portions of the base portion of the zipper 8 are the flap portions 3 and 3. Further, in the plastic film bag 1 shown in FIG. 6, the upper side portions of the front and back plastic films constituting the bag 1 are the flap portions 3 and 3.

  When the slider 30 is slid in either direction (see the directions of arrows A and A ′ in FIG. 9), the protrusions 32 and 32 formed facing the inner sides of the side leg pieces 31 and 31 The parts 8a and 8b are pressed and fitted to each other.

  The middle leg piece 35 functions as a stopper for preventing the slider 30 itself from detaching to the side when the slider 30 reaches the end 2 a of the opening 2, and the lower end is the uneven portion 8 a of the zipper 8. , 8b functions as a stopper that prevents the slider 30 from entering below. The protrusions 33 and 33 formed on the lower portions of the side leg pieces 31 and 31 are for preventing the slider 30 from coming out upward from the flap portions 3 and 3.

  FIG. 7 shows an enlarged view of the protrusion 32 of the slider 30, and FIG. 8 shows a state where the zipper 8 of the plastic film bag 1 is closed by the slider 30.

  The protrusions 32, 32 are formed to extend in a direction orthogonal to the zipper 8 so as to face the inner sides of the side leg pieces 31, 31, have a substantially semi-cylindrical shape, and the radius r is a concave portion of the zipper 8. It is set smaller than the width dimension W of 8a.

  In the closing slider 30, a pair of protrusions 32, 32 formed inside the side leg pieces 31, 31 are in pressure contact with the back side of the uneven portions 8 a, 8 b of the zipper 8, and the uneven portions 8 a, 8 b are fitted. Combine. The protrusions 32 and 32 have a substantially semi-cylindrical shape with a radius r smaller than the width dimension W of the recess 8a of the zipper, and the protrusions 32 and 32 have a very small area on the apex of the protrusions 32 and 32 and the uneven portions 8a and 8b. Press-contact the back side of the. Therefore, the apex portions of the protrusions 32 and 32 bite into the back side, and the side leg pieces 31 and 31 do not lose the repulsive force of the zipper 8 and are not deformed outward. Maintain stopping power for a long time. Further, since the protrusions 32 and 32 are in contact with the bag 1 with a small area at the apex portion, the slider 30 itself slides well.

(Other examples)
Note that the closing-only slider and the plastic film bag provided with the slider according to the present invention are not limited to the above-described embodiments, and can be variously modified within the scope of the gist thereof.

  For example, the zipper 8 may be a double chuck type having two concave portions 8a and convex portions 8b. In this case, the radius r of the protrusions 32, 32 of the slider 30 is smaller than the width dimension W of each recess 8a. Further, the slider 30 may have a form in which the middle leg piece 35 is separated from the side leg pieces 31 and 31 and is integrally assembled when the slider 30 is attached to the bag 1 in addition to the one integrally formed.

One Example of the slider only for closure concerning the present invention is shown, (A) is a front view, (B) is a top view, (C) is a bottom view, (D) is a side view. It is AA sectional drawing of FIG.1 (D). It is BB sectional drawing of FIG.1 (D). It is CC sectional drawing of FIG. 1 (D). It is a principal part expanded sectional view which shows the 1st example of the plastic film bag which concerns on this invention. It is a principal part expanded sectional view which shows the 2nd example of the plastic film bag which concerns on this invention. It is an expansion perspective view which shows the protrusion of the slider shown in FIG. FIG. 3 is an enlarged explanatory view showing a state where the slider shown in FIG. 1 closes the zipper. The conventional plastic film bag is shown, (A) is a perspective view, (B) is a principal part expanded sectional view. The conventional slider only for a closing is shown, (A) is a front view, (B) is a side view, (C) is DD sectional drawing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Plastic film bag 2 ... Opening part 3 ... Flap part 8 ... Zipper 8a ... Concave part 8b ... Convex part 30 ... Closed slider 31 ... Side leg piece 32 ... Projection part 35 ... Middle leg piece

Claims (2)

Dedicated for closing plastic film bags, at least one side of which is an opening, and a zipper consisting of a protrusion and a recess that can be fitted / released to each other on the opposing inner surfaces of a pair of flaps located in the opening A slider,
The slider is formed of a plastic material, and includes at least a pair of side leg pieces located outside the flap portion, and a middle leg piece having a length that is located inside the flap portion and does not reach the zipper. A pair of protrusions formed extending in a direction perpendicular to the zipper so as to face the inside of the pair of side leg pieces,
Each of the pair of protrusions has a substantially semi-cylindrical shape, and a radius is smaller than a width dimension of the recess of the zipper,
A special slider for closing. A plastic film bag main body having at least one side as an opening, and provided with a zipper composed of a convex part and a concave part that can be fitted / released to each other on the opposing inner surfaces of a pair of flap parts located in the opening part;
A closing-only slider according to claim 1;
A plastic film bag characterized by comprising:

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