FR2541652A1 - SYNTHETIC RESIN BAG EASY TO OPEN, AND MACHINE FOR MANUFACTURING SUCH A BAG - Google Patents

Abstract

THE BAG HAS INCLUDED A BODY SHAPED IN TWO THICKNESSES OF A SHEET OF MULTI-LAYER PLASTIC MATERIAL, HOT WELDED BY THEIR SUPERIMPOSED EDGES 4. A PULLING CORD B IS FIXED BY GLUING TO A PART OF THE INTERNAL FACE OF THE BODY FROM BAG A, TO THE PLACE PROVIDED FOR OPENING IT; A LEG D IS ATTACHED TO ONE END OF THE BREAKOUT CORD. THE SPECIAL MACHINE FOR THE CONTINUOUS MANUFACTURING OF BAGS CONFORMING TO THE INVENTION ALLOWS IN PARTICULAR TO DEFINE THE POSITION OF THE PULLING CORD ON REQUEST D. APPLICATION TO BAGS IN PLASTIC MATERIAL, IN PARTICULAR FOR FOOD OR SIMILAR FOODSTUFFS.

Description

Synthetic resin bag easy to open, and machine

to make such a bag.

  The present invention relates to an easy opening synthetic resin bag, and a machine for making such a bag. In a conventional bag, comprising a body made by superimposing two laminated films consisting of several layers of synthetic resin, and welding hot-seamed peripheral edges of these superimposed films, it is difficult to open a portion of the bag, in order to to extract the contents, because the body of the bag is formed of rolled films, which makes the body difficult to tear

  and does not open it easily.

  The object of the invention is to overcome the disadvantages that have just been exposed, by making a bag of the kind indicated, which is both easy to open and economical manufacturing, thanks to the

  machine also proposed by the invention.

  According to the invention, the bag as defined above is characterized in that it comprises a

  tear cord fixed by gluing to a

  part of the inside of the body of the bag, at the place provided for the opening of the latter; and a paw

  formed at one end of the tear cord.

  Pulling the pull cord to

  With the help of the tab attached to its end, it is possible

  easily and safely chirp the face of the body to which the tear cord is adhesively secured, thereby allowing the body of the bag to be easily and quickly opened. The invention also relates to a machine for

  manufacture the bag according to the invention, and allow

  both to operate continuously to fix by gluing the tear cord on the inner face of the body of each bag, making the tab associated with the end of each pull cord in

  this process of making the body of each bag.

  Other peculiarities and advantages of

  will still be apparent from the description of

  a few embodiments, presented hereinafter by way of non-limiting examples, with reference to the accompanying drawings, in which: FIG. 1 is a front elevational view

  a synthetic resin bag that is easy to open,

  form a preferred embodiment of the invention.

  tion; Figure 2 is a section of Figure 1, following I-I; Figure 3 is another section of Figure 2, following II-II;

  FIG. 4 shows a transverse groove

  dirty formed in a paw of the body of the bag easy to open of Figure 1;

  Figures 5 to 9 show other examples

  ples of the transverse groove of Figure 4; Figure 10 is a perspective view of

  synthetic resin bag easy to open from the

  re 1, showing during tearing the cord intended to be torn off this bag; Figure 11 shows in detail the end tab of the cord of Figure 10; Figure 12 is a perspective view of the body of an easy-to-open synthetic resin bag according to another preferred embodiment of the invention; Figure 13 is an enlarged section of Figure 12, following III-III; Figure 14 shows another example of the end tab of the tear cord; Fig. 15 shows an easily opened synthetic resin bag according to the invention, wherein the body of the bag is provided with a layer of adhesive substance;

  Figure 16 shows the whole of

  China manufacturing bag synthetic resin easy to open according to the invention; Figure 17 is a front view of a machine member of Figure 16, for defining the position of the tear cord; Figure 18 is a section of Figure 17, following IV-IV;

  FIG. 19 is another section of FIG.

  re 17, following V-V; Fig. 20 is a plan view of the parts

  of the machine of Figure 16.

  As seen in Figures 1 and 2, the

  synthetic resin bag has a body A constituting

  killed by a rolled thin sheet, formed by rolling

  together the desired number of layers of synthetic resin

  A base sheet 1, having at least one layer, carries a plastic layer 2, heat sealable, laminated on the inner face

  of the base sheet Two laminated layers 3,

  each by laminating together the base sheet 1 and the heat-sealable plastic layer 2, are

  associated with their plastic layers 2

  hot dies facing each other, and the peripheral edges of these laminated layers 3 are

  ultrasonic welded or hot-welded

  kill the body A of the bag The mark 4 indicates these edges

hot-welded.

  In order to make the base sheet 1, it is

  bends a synthetic resin presenting certain

  properties, such as good resistance

  this to moisture, heat, and a filtering effect

  With regard to ultraviolet radiation For the heat-sealable plastic layer 2, it is possible to use any material making it possible to join to one another by welding the heat-sealable plastic layers 2, when the peripheral edges of the body A of the bag are subjected to hot or ultrasonic welding. The position of the opening of the body A of the synthetic resin bag consisting of laminated sheets, according to the arrangement just indicated, comprises a tear cord B, glued on

  one of the internal faces of the body A of the bag, that is to say

  say on one of the plastic layers 2 weldable to

  as shown in FIG.

  It is possible to use any kind of

  rope of synthetic resin, or of wire made of

  natural or metal frame to make the rope-

  tear strip B, and this can be

  killed by a single strand, or by strands of fiber

Twisted.

  To fix the tear-off cord B on the inner face of the heat-sealable plastic layer 2, the following methods may be used: The outer surface of the tear-off cord B is made of heat-sealable resin, which makes it possible to fix it by hot welding;

  the tear-off rope B consists of

  twisted yarns and these fibers are heat sealable, which allows the cord to be

  hot welding; or the surface of the rope

  tear-off strip B has a coating "b"

  made of hot-weldable resin, as a representative

  in FIG. 2, which makes it possible to fix

  simple cord by hot welding on the cou-

plastic chew 2 heat sealable.

  It should be noted that apart from the embodiment o the tear cord B is

  is fixed by welding to one of the side walls

  the body A of the bag, the cord of tearing

  B can also be fixed by welding while

  turn on the side walls, as shown in Figures 12 and 13 The end C of the tear cord B is pinched between the edges

  superimposed devices of laminated layers 3.

  The end C of the tear cord B is

  provided with a leg D, constituted as indicated

  after. Lateral notches 5, 5 'are provided

  on either side of end C, in the direction

  tion planned for tearing off this end.

  A transverse groove 6 is disposed across the tear cord B, with some

  gap S between the transverse groove 6 and the ex-

  the notches 5, 5 ', so that the tab D is formed by the lateral notches, 5' and the transverse groove 6. The gap S is formed between the ends of the

  notches 5, 5 'and the transverse groove 6 is

  designed to ensure the support of the tab D, between the lateral notches 5, 5 ', by the edge 4 welded to

  hot around the body of the bag; and the

  Moved from the transverse groove 6 are located

  to be at least outside the former

  trenches of each of the corresponding lateral notches

  Therefore, if the tear lines

  rure are being diverted in the course of

  the law of deviations S, placed opposite the

  side notches 5, 5 ', the lines of de-

  are obliged to reach the transverse groove

versale 6.

  A variety of

  mes for the transverse groove 6, as was

  shown in Figures 4 to 9.

  It is desirable that the angle α, formed in

  be the transverse groove 6 and the rope B,

  towards the inside "a" of the body A of the bag or from

  minus 900 If this angle is less than 90, the effect

  strong applied at the moment of tearing can not

  to concentrate on the "n" zone located in the

  tersection of the tear cord B and the

  transverse groove 6, so that it becomes difficult

  cile for the pull cord to ensure with

  smoothly the desired tearing effect across the cou-

laminated die 3.

  As shown in FIG. 12, the body A of the bag is made in such a way that

  the edges of the laminated layer 3 are first super

  laid, then welded together to give a shape

  tubular to the laminated layer is then welded to the

  upper end and the lower end, to obtain a tightly sealed bag Lateral notches 5, 5 ', and a transverse groove 6, which are similar to those shown for the first embodiment, are formed on the edge of the welded lap joint 7, and the leg D

  is formed on the end C of the wire rope

  In such a folded bag, as the end C of the tear-off rope B overlaps the other end C, one of the ends C of the tear-off rope B covers the other end C, one of the ends C of the tear cord is severed at the location of the transverse groove 6 <that is to say in X, Figure 13) Therefore, by pulling on the leg D, one pulls only on the other end of the cord B, to open the body

A bag by tearing it.

  The lateral notches 5, 5 'and the transverse groove 6 are formed on the two edges of the laminated film 3, before the gasket is formed.

  welded overlay 7; and the superimposed

  laminated film 3, to form the welded joint 7 In this case, each is made

  lateral notches 5, 5 ', and the transverse groove

  6, not in the form of a linear groove

  but in the form of a notch groove

  relatively large deviation, so as to absorb any slight deviation of position, at the time when the overlap of the right and left borders, to ensure mutual alignment of notches of the right border and the left border. It should be noted that when the border

  4 hot-welded is narrow, the part of the

  re 4 hot-welded which is around the groove

  Cross-section 6 is made with a larger width, as shown in FIG. 1b. FIG. 15 shows an adhesive 8 applied to the body portion A of the bag, above the opening, with a web. tear-off 9 removably attached to the adhesive agent 8, following a

  provision used to close the opening in re-

  folding the upper part of the body A after it has been opened by tearing the cord-B. A machine will now be described for making the synthetic resin bags easy to

  open, as shown in Figure 1.

  This bag making machine is

  trout as shown in Figures 16 to

  This machine has separating rollers

  10 and 11, arranged one at the top and the other in

  down, facing each other, to separate vertical-

  3-1, which is intended to be on the upper surface of the bag, apart from a continuous lower laminate film 3-2, intended to constitute the lower face of the bag body. separation rolls 10,

  11, in the direction of the flow of the films, are dis-

  placed rollers 12, 13, which again ensure

  the application of laminated films on top of one another

  lower 3-1 and lower 3-2, which had been separated vertically from each other; and two pipes 14,

  , can be moved horizontally in the

  between the vertically separated laminated films 3-1, 3-2 Positioning members 16,

  intended to define the position of the drawstring

  each bag, are slideably mounted on the

  Pipes 14, 15 These positioning members 16 pre-

  each feel a hole 17, to receive cord-

  tear-off marks B-1, pulled by the side Les cor-

  breakout data B-1 passing through the holes

  17 to receive them have their definite position

  by the lateral sliding of the posi-

  16, which allows the cordons of

  B-1 to be sandwiched between the upper laminate film 3-1 and the lower laminate film 3-2 The upper laminate film 3-1 and the lower laminate film 3-2 are applied to one another under the action of the rollers 12, 13, so as to sandwich the tear-off cords B-1 between the

  two films These are again separated vertically-

  and the tear-off cords are glued to the upper laminate

  3-1, in a hot-melt press 18.

  On the downstream side of the hot-melt press 18, there is a tool 19 for making the bags by hot welding, and a shear 20, for cutting the edges of the bags, in order to complete the

confection.

  We will now describe in detail the organizations

  of positioning 16 to define the posi-

  As shown in FIGS. 17 to 19, the two pipes 14, 15 are mounted so as to be tight.

  by a front plate 21 and a plate

  22, being held in place by a fixing screw 23 Another screw 24 having an axial hole 25 is engaged in the front plate 21,

  way to pass between the pipes 14, 15.

  A tear-off cord B-1 is inserted into the hole 25 of the screw 24, and passes between the pipes 14, 15, to result in a receiving hole.

  17 formed in the posterior plate 22.

  A support pad 26 provided on the downstream side of

  separating rollers 10, 11, serves the purpose of

  the transverse grooves 6 on the films 3-1, 3-2, previously superimposed, to make the tab D. The notches 5, 5 ', which constitute the tab D are formed by the shear 20, at the same time as

  the continuous body A of the bag is cut out.

  The bag according to the invention being produced as just described, to extract the contents of the body A of the bag, the leg D formed in the

  welded edge 4 around the perimeter edge

  In doing so, the draw cord B is torn, tearing the laminated film 3 constituting the upper face of the body A of the

  bag, in order to open the bag.

  easy and safe, the opening of the body A of the bag, along the tear cord B. In addition, when continuous manufacture of bodies A bags of the kind just described,

  the continuous rolled films 3-1, 3-2 are separated

  vertically by the separating rollers 10, 11, respectively, and the tear-off cord B is guided in the intermediate space by

  the positioning member 16, so as to be

  w is sandwiched between the upper laminate film 3-1 and the lower laminate film 3-2, to be adhesively secured against the upper laminate film 3-1, by the hot-melt press 18, to allow

  continuous manufacture of bodies to bags

forms to the invention.

Claims (6)

  1 synthetic resin bag easy to open,   having a body formed of a laminated film in   sieur layers of synthetic resin, characterized in that it comprises a tear cord fixed by gluing to a portion of the inner face of the body of the bag, at the location provided for the opening thereof; and a tab formed at one end of the tear cord. Resin bag according to claim 1, characterized in that the pull cord is   constituted by a single strand, or by a strand of   twisted bead, and in that the surface of the cord   is covered with a heat sealable resin.   Resin bag according to claim 1, characterized in that the pull cord is   consisting of a strand of twisted fibers, for   which were used heat-sealable fibers.   4 Synthetic resin bag according to the claim   1, characterized in that the tear cord is constituted by a monofilament strand of heat-sealable resin.   Synthetic resin bag according to claim 1, characterized in that the tear cord is attached by heat welding to the inner side of the bag body.   6 Synthetic resin bag according to the claim   1, characterized in that the leg is made   in such a way that one end of the pull-cord is clamped between hot-welded portions of a peripheral edge.   only from the body of the bag; lateral notches are   formed on either side of the end of the   tear cord at the place of the parts   hot die from the edge of the body of the bag; and a transverse groove lying in front of the   internal ends of the lateral notches.   7 Synthetic resin bag according to the invention   6, characterized in that the transverse groove   Versale can have one of the following forms   triangular, semi-circular, rectilinear vron, or rectangular.   8 Machine for fixing by gluing a cord-   net tear on the inner side of the body of a bag according to claim 1; characterized in that it comprises: separating rollers for vertically separating a continuous top rolled film, intended to constitute the upper face of the   body of the bag, another continuous laminated film   laughter, intended to constitute the underside of the body of the bag; a positioning member for defining the position of the tear-off cord, and slidably mounted laterally between the rolled film   upper and lower laminated film; a hole   ge in the positioning member, to receive the tear cord; and gluing means to   hot to fix by gluing the pull cord-   against the upper surface of the body of the bag, these   gluing means being located on the downstream side of the   the positioning of the tear cord.