May 8, 1962
`3,033,257
`H. H. WEBER
`BAG FORMING TUBE AND METHOD OF FORMING AND ACCUMULATING THE SAME
`Filed Aug. 21, 1957
`
`2 Sheets-·Sheet 1
`
`Free-Flow Packaging Int'l, Inc.
`Exhibit 1010
`
`Page 001
`
`

`
`May 8, 1962
`3,033,257
`H. H. WEBER
`BAG FORMING TUBE AND METHOD OF FORMING AND ACCUMULATING THE SAME
`Filed Aug. 21, 1957
`..:::t::!...:r q~ 7
`
`2 Sheets·.Sheet 2
`
`j{,{,
`
`2.
`
`-Enzen.t:CJ.r'
`HERBEAT H. UEBER
`
`Free-Flow Packaging Int'l, Inc.
`Exhibit 1010
`
`Page 002
`
`

`
`United States Patent Office
`
`3,033,257
`Patented May 8, 1962
`
`1
`
`3,033,257
`BAG FORMING TUBE AND METHOD OF FORM·
`lNG AND ACCUMULATING THE SAME
`Herbert H. Weber, Sheboygan, Wis., assignor to
`H. G. Weber and Company, Inc.
`Filed Aug. 21, 1957, Ser. No. 679,334
`3 Claims. (CI. 150-1)
`
`2
`tion in the disclosure of the preferred embodiments there(cid:173)
`of in the following specification, claims and drawings,
`in which:
`FIGURE 1 is a plan view illustrating a part of a sup-
`5 ply length of bag material and showing the bag construc(cid:173)
`tion and the method of making the bags of the present
`invention;
`FIGURE 2 is a plan view of a part of a supply length
`of bag material illustrating another bag construction and
`10 method of making the bags;
`FIGURE 3 is a plan view taken from the bottom of a
`device for use in connection with forming the bags;
`FIGURE 4 is a vertical sectional view taken along line
`IV-IV of FIGURE 1 illustrating the steps of seaming
`15 and slitting;
`FIGURE 5 is an end view of a roll of bag material
`shown to illustrate a manner of storing finished bags;
`FIGURE 6 is a side elevational view showing the posi(cid:173)
`tion of a length of bag material in another form which
`20 may be used for storing bags;
`FIGURE 7 is an illustration of a length of bag ma(cid:173)
`terial in the form of the invention wherein the supply ma(cid:173)
`terial is originally tubular in shape;
`FIGURE 8 is another illustration of a length of bag
`25 material showing one form of the laterally extending
`seams;
`FIGURE 9 is an enlarged sectional view taken along
`line IX-IX of FIGURE 8 illustrating the appearance of
`the slit with the seams at the side of the slit;
`FIGURE 10 is a perspective view showing one form of
`a seaming device;
`FIGURE 11 is a perspective view illustrating another
`form of seaming device;
`FIGURE 12 is a vertical sectional view taken through
`35 the seaming devices and a bag illustrating the operation
`of the pair of seaming devices forming a seam across the
`bag; and,
`FIGURE 13 is a plan view of a supply length of ma(cid:173)
`terial illustrating still another form of the lateral seam.
`In the figures of the drawings, various forms of seams
`which may be made in accordance with the principles of
`the invention are illustrated. It will be understood that
`the bags are formed from a length of supply material
`which may be either flat in its original form or tubular.
`45 If tubular, it may be slit longitudinally in order to be
`formed and folded in accordance with the invention. The
`various forms will be discussed in the order in which the
`drawings appear with the preferred forms being illustrated
`as the final bag supply material in FIGURES 8 and 13.
`Referring to FIGURE 1, a lerigth of bag material 10
`is shown in plan view to illustrate the method of forming
`In this form, bag material originally
`bags therefrom.
`is a flat layer of thermoplastic material, such as a vinyl
`polymer, polyethylene, or other suitable plastic that is
`55 heat sealable and is adapted to form a flexible and rela(cid:173)
`tively transparent sheet of material for the formation of
`inexpensive bags or containers.
`The flat layer of material 10 is first doubled in a
`lengthwise direction with the first edge 12 being brought
`60 over on top of the material toward a second edge 14,
`but short of the second edge to form the arrangement
`shown in FIGURE 1. This will 'leave an area 16 of ma(cid:173)
`terial between the two edges 12 and 14 which will be
`located at the top of the bag and will be an extension
`65 of the rear side wall of the finished bag. The rear side
`wall of the bag will be formed by a lower layer 18 of
`the doubled material and the front side wall will be
`formed by an upper layer 20 of the doubled material.
`In accordance with the method of the present inven-
`70 tion, the bag areas are next defined by forming trans(cid:173)
`versely extending welded seams, such as shown at 22
`and 24 extending across the bag and joining the layers
`
`The present invention relates to improvements in bag
`constructions and methods for manufacturing bags.
`More specifically, the invention relates to a bag con(cid:173)
`struction and method of forming the bag wherein a se:ies
`of bags are formed from a long length of bag material
`without waste of the material. The material is prefer(cid:173)
`ably formed of a thermoplastic, such as a polyethylene
`or vinyl polymer that is adapted to form a flexible and
`relatively transparent bag of an inexpensive construction.
`In one form a length of tubular material which may be
`seamless is employed. In another form fiat material will
`be used.
`In this instance, the length of fiat material is
`prepared :with one or both edges turned inwardly toward
`the center to overlie the center portion of the material,
`thus forming a two layer tubular length of bag material.
`The tubular material or flat folded material is formed
`into a succession of bags by forming transverse seams
`across the material which are partially severed by inter(cid:173)
`rupted slit lines. One or a pair of bags are formed across
`a supply length of material and the bags are separated
`by tearing them from the supply.
`The present invention contemplates forming a supply 30
`of preformed bags which can be individually separated
`from the length when individual bags are needed and
`used. Transverse seams are formed across the length of
`tubular material at spaced intervals equal to the width of
`bag to be formed.
`In one form a seam is made by separating the mate(cid:173)
`rial in spaced slits and the layers at the sides of the slits
`joined to form a seam. Between the ends of the slits spot
`welds wider than the slits form a continuation of the seams
`which are at the sides of the slits.
`In another form uniform seams are made and are cut
`down their center with elongated interrupted slits. The
`seam may be interrupted in the area between the ends
`of the slits in order that the seams of the bags may open
`when the bags are filled to provide a vented bag. The
`seams also may be continuous between the ends of the
`slits to form a continuous seam down the sides of the bags.
`Accordingly, it is an object of the present invention
`to provide an improved bag construction wherein a plu(cid:173)
`rality of bags may be manufactured and retained as an 50
`integral part of an elongated supply length of bag ma(cid:173)
`terial.
`Another object of the invention is to provide a bag
`construction wherein preformed bags remain in an at(cid:173)
`tached state to a supply length of a plurality of bags, and
`the individual bags may be readily and simply removed
`from the end of the supply as they are needed.
`Another object of the invention is to provide an im(cid:173)
`proved bag construction and a method of making bags
`which effects a saving in operations and in material and
`obtains a readily available easily handled supply of bags.
`Another object is to form a supply of bags attached
`to each other at spaced intervals along side seams wherein
`the attached portions may be torn without danger of dam(cid:173)
`aging the bag side seam.
`Another object of the invention is to provide an im(cid:173)
`proved bag construction for vented bags.
`A further object of the invention is to provide an im(cid:173)
`proved method for making bags from lengths of thermo(cid:173)
`plastic material.
`Other objects and advantages will become more ap(cid:173)
`parent with the teaching of the principles of the inven-
`
`40
`
`Free-Flow Packaging Int'l, Inc.
`Exhibit 1010
`
`Page 003
`
`

`
`3,033,257
`
`3
`13 and 20 together. The seam area 22 extends from its
`edge 26 to its other edge 28. Since the seams are identi(cid:173)
`cal, only seam 22 will be described in detail.
`The seam area is next slit by the formation of a series
`of elongated cuts or slits 30, 32 and 34 which are spaced
`from the edges 26 and 28 of the seam, and are preferably
`centrally located between the edges 26 and 28. The slits
`are each separated at their ends by a continuous or un(cid:173)
`slit length of material with the slits 30 and 32 separated
`by the unslit area 36, and the slits 32 and 34 separated
`by the unslit area 38. Further, end slits 30 and 34
`do not extend completely to the edges of the material.
`The slit 34 bas an unslit area 40 between its end and the
`edge 14 of the material. The slit 30 has an unslit area 41
`between its end and the doubled edge 40a of the material.
`Thus, when a bag, such as shown by the area 42 is
`removed from a supply length 44 of the material, the
`user grips the bag, pulling it away from the supply length
`44. The slits will, of course, immediately separate and
`increased pressure will cause the unslit areas 36, 38, 40
`and 41 to tear, thus releasing the bag.
`The transverse seam 22 will have an area 46 on one
`side of the series of slits which will serve the bag 42.
`The area 48 of the seam on the other side of the slits
`will serve a succeeding bag 50.
`Although the formation of the seam has been shown
`and described with material folded as shown in FIGURE
`1, it will be understood that the seam may be made using
`the same construction with tubular material.
`As an example of a mechanism used in practicing the
`method of the invention, a sealing bar 52, FIGURES 1
`and 3, is employed. The bar may be applied manually
`or may be applied by mechanical means such as by being
`mounted on the surface of a roller which will rotate as
`the length 44 of material is moved forwardly.
`The bar 52 acts as a carrier for the seam-forming and
`slitting means and carries a series of slitting knives such
`as 54 and 56 on its lower surface 58. As shown in FIG(cid:173)
`URE 4, illustrated by the knife 54, the knife has a V(cid:173)
`shape with a sharp lower straight elongated edge 60.
`When the knife 54, which is heated, forces its way
`through the upper and lower layers 20 and 18 of the ma(cid:173)
`terial to sever them, the knife is pressed against the ma(cid:173)
`terial. The material is shown resting on an upper surface
`of a table 62 or suitable support. As many knife lengths
`are provided for the bar 52 as there are slits across the
`material.
`While the material is being cut, seaming surfaces 64
`and 66 press against the material to form elongated seam
`areas 68 and 70. The seaming surfaces 64 and 66, as
`shown in FIGURE 3, are flat elongated areas extending
`on each side of the cutting knives 54 and 56. The seam(cid:173)
`ing surfaces are continuous, extending across between the
`ends 72 and 74 of the knives 56 and 54 and also across
`and beyond the end 76 of the knife 54. This insures that
`the seam will be continuous completely across the length
`of material, although the slit portions will be intermittent.
`Thus, in effect, a spot weld will be formed at the
`locations 36, 38, 40 and 41 at the ends of the slit por(cid:173)
`In some instances, it may be desired to make a
`tions.
`special and separate spot weld at the locations between
`the slits. When the individual bags are pulled from the
`length of bag material, the bags will freely separate along
`the slits and the welded areas between the slits, which
`may be spot welds, must tear. The tearing will gener(cid:173)
`ally follow the line of slits so that the bags will separate
`substantially along a straight line between the slits.
`When the bar 52 is brought into sealing position, as
`shown in FIGURE 1, the edges 60 of the knives 54 or
`56 cut through the layers of material forming the slits
`across the material. The bar is heated and is shown as
`having a built-in electrical heating element 80, which
`maintains the length of the bar at a uniform temperature
`which is sufficient to soften and weld the thermoplastic as
`the bar is applied thereto without causing it to burn.
`
`20
`
`4
`As illustrated in F1GURE 4, the flat sealing surfaces
`64 and 66 press down at the sides of the slit lines to
`soften the material and cause a weld to join the layers
`of the material, as indicated by the areas 68 and 70.
`5 The bar 52 is held in place for a short period of time
`and then removed.
`The supply lengths of bags joined which are intercon(cid:173)
`nected by the continuous spots between the severed lines,
`may be wound into a cylindrical roll 82, as shown in
`10 FIGURE, 5, supported on an axis 84 whereby the roll
`may rotate as individual bags are pulled off the roll.
`Another manner o£ storing the bags in their continu(cid:173)
`ous form is illustrated in FIGURE 6, wherein the material
`is formed into an accordion-folded stack 86. The folds,
`15 such as 88 and 90 may be formed at 'any location along
`the material, or may be formed along the slits where the
`material will assume a sharp fold and where a full layer
`of the stac!{ is removed each time an individual bag is
`tern from the end of the supply.
`In the embodiment illustrated in FIGURE 2, a leneth
`9-2 of bag material is supplied and is prepared so that two
`bags will be formed with each section that is removed
`from the end of the material supply.
`The two longitudinal edges 94 and 96 of the originally
`25 fiat single layer of material are folded inwardly toward
`the center 98 and laid upon the material so as to be just
`short of reaching the center. The edge 94 draws an upper
`layer 100 of material over a lower layer 1!32 of material
`to form a front and a rear wall of the bags which arc
`30 manufactured from the material. The edge 96 brings
`an upper layer 104 over a lower layer 106 to form the
`front and rear wall of the bags which are formed from
`one-half of the width of the material.
`Transverse seams such as 108 and 110, and 112 are
`35 formed laterally across the folded material at spaced inter(cid:173)
`vals spaced in accordance with the width of the bag de(cid:173)
`sired. Each of the seams is the same as seam 108 which
`will be described in detail. Seam 108 extends compl,~tely
`across the folded material. Between the edges 116 and
`40 118 of the seam 108 are a series of separated slits 120,
`122, 124, 126, 128 and 130. At the end of the slits, and
`between the ends of each of the slits is a continuous welded
`area which, in effect, forms a spot weld between the slits
`with these welded unslit areas being illustr:.:ted at 132, 134,
`,15 136, 138, 140, 142 and 144.
`The seam 108 combined with the next succeeding seam
`110 forms a pair of bags 146 and 143 which are separated
`at their tops by a longitudinal slit 150. The longitudinal
`slit 150 is part of a series of slits extending down the
`50 center line 98 between the rows of bags. These longitu(cid:173)
`dinal slits are separated by areas of continuous material
`which are unslit, as shown at 133, 152 and 154. These
`areas of material prevent the length of supply material
`from separating down the center and permit separating
`[)5 the laterally opposite bags such as 146 and 148.
`The seams 108, 110 and 112, with the intermediate
`slits between their edges, may be formed by a bar similar
`to FIGURE 3. The seam line down the center 98 of the
`material also may be formed by a bar with intermediate
`60 cutting edges, but this bar ;will not have sealing surfaces
`at the sides of the cutting edges.
`In some instances it appears desirable to provide a bag
`which has air vents. This may \)e accomplished by pro(cid:173)
`viding special openings in the bag walls, and in the present
`65 invention is accomplished in one form simultaneously with
`forming the bags.
`For the formation of vented bags, in the arrangement of
`the bag supply material of FIGURE 1, the areas 36, 33 and
`41 between the ends of the slit lines ·will be left unseamcd.
`70 Thus, although the seam sides 46 3nd 48 will join the
`layers of material on each side of the slits, they will extend
`only to the ends of the slits. The areas at L1e ends of the
`slits will be unseamed so that when bag 42 is S(;parated
`from the supply end, its upper and lower walls 20 and 1S
`75 will be free to separate at tl1e locations which were at the
`
`Free-Flow Packaging Int'l, Inc.
`Exhibit 1010
`
`Page 004
`
`

`
`3,033,257
`
`15
`
`6
`5
`the width of the hag desired. The seam 178 will then
`ends of the slits. The walls in separating will form vent
`form an edge for each of the adjacent bags 182 and 184
`holes to let the air into the bag. These vent holes, will,
`and the seam 180 will form a seam for the other side of
`of course, be present in both sides of the bag, and each
`bag 184 and for a succeeding bag 186.
`bag will thus be provided with vent holes.
`The seams 178 and 180 comprise discontinuous or in(cid:173)
`In the bag of FIGURE 2, the areas 132, 134, 136, 140,
`termittent slits such as 183, '190, 192 and 194 for the
`142 and 144 also will be unseamed. The walls of the
`seam 178. Since seam 180 is identical with seam 178,
`bags will thus be free to separate in these locations to
`only the seam 178 need be described.
`ventilate the contents thereof.
`In making these ·vented bags, a sealing bar similar to
`The slits are separated by unseamed spaces between
`the bar 52 may be employed. However, instead of the
`10 t'le ends of the slits and between the ends of the last slits
`seaming surfaces 64 and 66 being continuous, the areas,
`and the top and bottom edges 174 and 196 of the bag re(cid:173)
`such as 78, between the ends of the slit lines, will be inter(cid:173)
`spectively. The unseamed areas at the end of the slits,
`rupted. This can ·be achieved by providing an area of
`moving from the bottom to the top of the bag, are shown
`heat insulation at 78 or making the seaming surface dis(cid:173)
`ai 198, 200, 202, 2\14 and 206. These unseamed areas
`continuous at this area. Thus, when the seaming tool 52
`15 will provide vent holes in the side of the bag when the
`is applied transversely across the supply of material, only
`bags are torn from the supply.
`the seaming surfaces will seam the upper and lower layers
`The slit construction, as illustrated in FIGURE 9, con(cid:173)
`of the bags and no seam will be formed at the ends of the
`sists of an elongated opening 208 with plastic bead seals
`slits.
`210 and 212 on each side. The bead 210 joins an upper
`As a summary of the method of forming the bags of
`20 layer 214 and a lower layer 216 of the bag 218. The
`FIGURE 1, the supply of materiallO is doubled by bring(cid:173)
`<bead 212 joins the upper layer 220 and the lower layer
`ing the edge 12 over the top of the material short of the
`222 at their edges to form the seam for the edge of bag
`outer edge 14. This brings the layer 20 over the layer
`224. Thus the bags 224 and 218 will separate easily
`18, and these layers are welded to each other along lateral(cid:173)
`when a longitudinal pull is applied to bag 224 and each
`ly extending seams by placing a welding and cutting bar
`25 of the slits will spread, with the material between the slits
`52 over the material at spaced intervals.
`tearing.
`Seam 22, which is exemplary of the other seams, has
`The slits, and the bead seals on each side of the slit,
`an area in which the upper area is sealed to the lower
`are formed simultaneously. The formation is accom~
`layer by fusion of the thermoplastic material. Betwe.en
`plished by engaging the layers of material from one or
`the edges 26 and 23 of the seam a series of interrupted
`30 both sides with a narrow heated surface.
`slits 30, 32 and 34 are formed. These slits easily permit
`For this purpose, a slit and seal forming series of mem(cid:173)
`the separation of the bag from the end of the supply
`bers are shown at 226, 228, 230 and 232. These ·mem(cid:173)
`material by tearing the continuous areas 36, 33, 40 and 41
`bers are mounted on a support bar 234 to which they are
`at the ends of the slits.
`integrally attached in linear alignment with spaces 236,
`In the form of FIGURE 2, the opposing edges 94 and
`35 238 and 240 therebetween.
`96 of the length of material 92 are brough toward the
`The slit and seam forming elements are heated by a
`center and a series of intermittent slits are formed down
`heating element 242 embedded in the carrier bar 234.
`the center of the material. The slits are separated by
`This heating element brings them to a temperature where(cid:173)
`areas 138, 152 and 154 which will be at the corners of
`in the thermoplastic bag material is quickly melted to
`the individual bags 146 and 148. Twin bags are formed
`40 form the plastic bead seals on each side but they are not
`at each side of the material by each laterally extending
`brought to a temperature wherein a danger of a conflagra(cid:173)
`seam Hl8, 110 and 112, which extends completely across
`tion exists.
`the material. Each ·seam has a series of intermittent slits
`The bar 234 is arranged with the slit and bead forming
`centrally located between its edges with continuous areas
`elements facing downwardly and applied to the layers
`such as 132, 134, 136, 138, 140, 142 and 144 at the ends
`45 of bag materials transversely across the supply length at
`of the slits. These continuous areas are torn when the
`the proper spaced intervals. If desired, as shown in FIG(cid:173)
`individual bags are pulled fmm the supply of material
`URE 12, opposed members may be brought together so
`which is maintained such as in a roll 82 of FIGURE 5,
`that they meet and the bag material is melted from both
`or an accordion-folded stack 85.
`surfaces at the same time.
`In forming the vented bags, a method similar to that 50
`In FIGURE 12 an upper member 244 is brought down
`shown in FIGURES 1 and 2 is employed. The seams
`against the upper layer 246 of material and a lower mem(cid:173)
`which extend on each side of the slits are, however, dis(cid:173)
`ber 296 is brought upwardly against the lower layer 250
`continued in the areas between the slit lines so that when
`of material. The member 244 has a material engaging
`the individual bags are moved from the supply of mate(cid:173)
`slit and bead forming member 270 which forms an inter-
`rial their layers will ·be permitted to separate and form
`55 rupted ridge along the lower face of the member 244.
`vent openings in the location where the layers are un(cid:173)
`The lower member 296 has an interrupted ridge element
`seamed.
`272 which faces upwardly and which forces its way
`As illustrated in FIGURE 7, the bags may be formed
`through the plastic bag material to form a slit, and beads
`from a continuous length 160 of tubular material. Ther(cid:173)
`274 and 276 are caused by the melting material on each
`moplastic material such as polyethylene is furnished as a
`60 side of the slit. In some instances a vented bag is not de(cid:173)
`stock supply item from manufacturers, being produced
`sired, and a bag with a continuous seam down the sides is
`by them by extrusion methods and being obtainable at
`required. The construction illustrated in FIGURE 13 is
`relatively inexpensive costs. The length of tubing 169
`then employed using the sealing element illustrated in
`may be utilized in various forms but is shown as being
`FIGURE 11.
`.
`cut along the center along a line 162 to separate the tubu- 65
`In FIGURE 13 a length of supply material 277 is
`lar material into two sections. The sections may then be
`formed with the upper layer 278 folded over the lower
`used as they are illustrated in FIGURE 7 or they may be
`layer 280 to a position short of the upper edge 282 of the
`arranged with each of the sections 164 and 166 folded as
`lower layer to form a bag closing flap 284. Seams 286
`illustrated by the supply length 168 of FIGURE 8.
`70 and '288 are formed laterally across the supply of mate(cid:173)
`In this supply length of FIGURE 8, one of the edges
`rial at distances spaced the desired distance of the width
`170 is drawn downwardly from the other edge 174 to
`of a bag 290. The seams complete the edges of the bag
`provide a flap area 176 for the bag.
`290 joining the upper and lower layers and seam 286
`The supply length 168 is formed with a plurality of
`also completes the edge of a bag 292 and seam 288 com-
`laterally extending seams such as shown at 178 and 180.
`TI1e seams 178 and 180 are spaced in accordance with 715 pletes the edge of a bag 294.
`
`Free-Flow Packaging Int'l, Inc.
`Exhibit 1010
`
`Page 005
`
`

`
`3,033,257
`
`•
`
`8
`7
`edge for bags to be removed from the length of mate-
`The bags are again formed with a plurality of elon-
`rial, a plurality of rows of slits extending endwise laterally
`gated linearly aligned separated slits such as shown at
`across the width of bag material and formed through
`296, 298, 300 and 302 for the seam 286. The seam 286
`each of the layers with said rows located at intervals
`is of a construction identical to seam 238 and, therefore,
`5 along the length of the bag material, the slits in each
`only one seam need be described.
`row being spaced from each other with spaces between
`The slits are again formed with bead seams on either
`side to join the edges of the bags.
`their ends, and plastic weld beads extending along both
`Between the ends of the slits, spot welds such as 304,
`edges for the length of each of the slits using a minimum
`of material and joining the layers of bag material at the
`306, 308, 310 and 312 are formed. The spot welds are
`shown as being rectangular in shape and are seals which 10 edges of the slits with the layers of material immediately
`outside of said beads being freely separable so that beads
`join the upper and lower layers of bag material over the
`area indicated.
`at each side of the slits will serve to form the side edges
`When the bag 292, for example, is pulled from the bag
`of adjacent bags when individual bags are removed from
`supply, the bags will immediately separate along the slits
`the length of bag material.
`and as the pressure is increased will tear across the sealed 15
`3. A bag construction comprising a length of bag rna-
`areas 304, 306, 308, 310 and 312. Since the bags may
`terial formed of a plurality of layers, seams extending
`tear irregularly in this area and since a continuous seal
`across the material and joining the layers of material to
`on the side of the bag is desired without a break, the seal
`complete the seams for the edges of bags taken from the
`area between the slits is wider than the seals at the side of
`length of material, intermittent unjoined areas interrupt-
`th_e sli!s. Thus, even if a jagged tear is produced, there 20 ing the seams to leave joined lengths therebetween and
`will still be seam material to close the layers of the bag.
`to form vent openings in the finished bags, and lines of
`Tne slits are again provided by ridges 314, 316, 318
`severed material extending along the joined lengths of
`and 3211 mounted to project from a carrying bar 3l2.
`the seams and between the edges thereof so that bags
`The bar is against provided with a heating element 324
`may be separated from the lengths of material and so
`to impart heat to the slit and bead seal fom1ing elements. 25 that the joined lengths form seams for the bags.
`Between the ends of the elements are rectangular flat
`4. The method of forming a bag from opposed layers
`sealing areas 326, 328 and 33:1. These flat elements are
`of bag material which comprises the steps of joining
`arranged to engage the bag at the same time as the slit
`the layers of material along seam lengths and leaving
`forming elements and will form the spot weld areas be-
`spaced areas between the ends of the seam lengths where
`tween the ends of the slits. Although this is the pre- 30 the layers are unjoined, and cutting the material alon"
`lines intermediate the edges of the seam lengths so that
`ferred arrangement for forming the seam, in some in-
`s_tances it may b~ feasible to apply the spot welds at a
`bags may be separated from a length of bag material
`time after the slits and the bead seals on each side of
`by separation along said lines and by tearing in said
`~pace~ areas, the opposed layers of bags being separable
`the slits are formed.
`Thus, it will be seen that I have provided an improved 35 m S~I~ spaced areas where the layers are unjoined and
`the Jomed layers along the seam lengths forming the
`bag construction with a mechanism and method of form-
`ing the construction which is well adapted to inexpensive-
`connecting edges for the bags.
`ly manufacturing a large number of bags and which meets
`5. A bag construction comprising a length of plastic
`~~g material formed of a plurality of layers, said layers
`the objectives and advantages hereinbefore set forth.
`The method may be used on continuous sheets of plastic, 4-0 JOmed at least at one edge of said length to form an edge
`for b~gs to be removed from the length of material, a
`or a tubular length formed of material such as poly-
`ethylene, which is obtained in roll form from the manu-
`plurality of rows of slits extending endwise laterally
`factur~r. The bags may be made simply by rolling the
`across the width of bag material and formed throuah
`matenal off the roll and reforming it in another supply
`each of the layers with said rows located at interv:ls
`roll. The supply roll contains the individual bags which 45 ~~~~= ~hp~~=~g~~~ ~haec:a;t~:t~I!tahl,stphaeces.lsitbseitnweeaecnhtrhoe'I.vr
`are po_tentially ready for use. The user, thus can keep
`an entire roll or stack of the bao-s for his use tearing off
`ends, plastic weld beads extending along both edges for
`the individual bags from the r~ll as they are needed.
`the length of each of the slits using a minimum of rna-
`terial an~ joi~ing the layers of bag material at the edges
`Thus, the bags themselves form a compact storage unit
`and repacking of the bags is not necessary during manu-
`of the slits With the layers of material immediately out-
`facture. These and other savings in time and material
`side of said beads being freely separable so that beads
`at ea~h side of the slits will serve to form the side edges
`are apparent from the improved construction and method
`of adjacent bags when individual bags are removed from
`disclosed herein.
`I have, in the drawings and specification, oresented a
`the length of bag material, and areas of said layers joined
`?etaile_d disclos.ur_e of the preferred embodim'ents of my
`together between the ends of said slits in said spaces.
`6· A b~g construction comprising a length of plastic
`mventwn, but It IS to be understood that I do not intend
`~o limit the invention to the specific forms disclosed, but
`?~g mate:ml formed of a plurality of layers, said layers
`mtend to cover all modifications, changes and alternative
`JOmed at least at one edge of said length to form an edge
`for. bags to be remo~ed from the length of material, a plu-
`constructions and methods falling within the scope of
`the principles taught by my invention.
`ra!Ity of rows of slits extending endwise laterally across
`60 the width of bag material and formed through each of
`I claim as my invention:
`. 1. A bag construction comprising a length of bag mate-
`the layers with said rows located at intervals alon"' the
`nal formed of a plurality of layers, a seam extendin"'
`length of the bag materia!, the slits in each row being
`across the material and joining the layers of material t~
`spac:d from each other with spaces between their ends,
`complete the seam for the edges of bags taken from the
`plastic weld beads extending along both edges for the
`length of materi~l, intermittent unjoined areas intersecting 65 length of each of the slits using a minimum of material
`the seam operative to form vent openings in the finished
`a~d joi_ning the layers of bag material at the edges of the
`slits with the layers of material immediately outside of
`bag, and slits along said seam between the edges thereof
`and terminating at said unjoined areas so that the layers
`said ·beads being freely separable so that beads at each
`of the bags separate along the slits with a portion of 70 side of the slits will serve to form the side edges of adja-
`cent bags when individual bags are removed from the
`each side of the seam serving adjacent bags and the bags
`length of bag material, and welds joining the layers to-
`tearing apart at said unjoined areas.
`2. A bag construction comprising a length of plastic
`gether in said spaces between the ends of the slits in an
`area extending laterally beyond the edges of the