US2220874A - Method for the manufacture of containers - Google Patents

Description

METHOD FOR THE MANUFACTURE OF CONTAINERS Filed Opt, 20, 1937 INVENTOR ATTOR Patented Nov. 5, i940 I g "UNITED sTATEs PATENT o ncE METHOD FOR THE MANUFAGTUREQOF commas Harry F. Waters, New York, N Y.

Application October 20, 1937, Serial No. 169,942 4 Claims. (Cl. 93-35) i This invention relates to the manufacture of adhesive I is applied to the web .of material bags, boxes or similar containers and morepardesignated generally by the letter A along one ticularly to an improved bag or container which is marginal edge of the web and a similar line of fluid and liquid tight. More particularly my inadhesive l l is applied to the other marginal edge vention relates to an improved method for the of the web. Bands of adhesive I! are applied to manufacture of bags and similar container in the web at spaced intervals and connect the marwhich the material from which the bag or conginal lines of adhesive l0 and II. These bands taineris made is preprinted in such a manner of adhesive are substantially twice the width of that the seams and joints thereof will be liquid the bands of adhesive l0 and H since when the m and fluid tight. web is cut into baglengths across the web along One difiiculty in forming a fluid or a fluid and the dotted lines l3; each blank will be provided liquid-tight bag is that it has heretofore been with longitudinal lines of adhesive l0 and II impossible to form the seams and joints thereof running along the margins of the web and lines fluid and liquid tight. Attempts have been made of adhesive 14 and 15 extending across the blank with some measure of success to form a liquidat the end edges thereof. Each bag blank will be 15 tight bottom, but unless the bag itself throughout provided with lines of adhesive substantially is liquid and fluid tight, the formation of a fluid square or rectangular in.out1ine. and liquid-tight bottom becomes of little avail. The blank or web of material during its pas- The failure to construct a satisfactory fluid and sage through the tube forming mechanism of a. o liquid-tight container has in a large part been conventional bag machine is folded so as to procaused by the'methods employed in forming the vide a front wall l6, reentrant folds l1 and I8 seams of the bag as the material from which the forming gussets of the bag and arear wall formed bag is constructed is converted into bag form. by-sections l9 and 20 of the blank. In accord- Accordingly one of the chief objects of this ance with standard bag making practices the tube 5 invention is to provide an improved method of is formed by overlapping the longitudinal marpreprinting on the material from which the bag ginal edges of the web. However, in accordis made. Predetermined lines of adhesive are ance with my present invention the marginal applied prior to bag formation which, when edges of the web are not overlappei'but on the brought into operative relation, will result in the contrary the blank is so formed into a tube as to formation of liquid and fluid-tight seams. Other bring the marginal lines of adhesive l0 and ll objects of this invention will become more apinto contact with each other. If the adhesive parent from a reading. of the following speciflcaernployed be non-thermoplastic in nature; the tion taken in connection with the attached drawseam formed by bringing the lines of adhesive ing in which like numerals indicate like parts into contact is secured in a conventional manner,

Fig. 1 is a top plan view of a section of a web If,however,the adhesive employed be of athermoof material from which bags may be formed showplastic nature, heat and pressure will be applied ing the manner in which the lines of adhesive are to the contacting lines of adhesive so as to cause preprinted thereon; I I afiow and a consequent adhesion of the two lines Fig. 2 is a detailed view of a bag blank prior of adhesive. I to its formation into a tube and showing the in- The bottom of the bag is readily formed by apvention as applied to the construction of a plying, if a thermoplastic adhesive be used heat, 81188815811 nd and pressure to'the band of adhesive l2 before Fig. 3 is an end view of a bag made in accordthe webis severed into, bag lengths and an inance with the present invention after the end spection of Fig. 3 showing the sealed end of the has b n l bag will reveal the fact that there is a continuous Referring now to the drawing and more parseal formed by the line of adhesive. 15 which ticularly to Fig. 1, there is shown the manner in extends throughout the end of the bag and since which the material of the bag may be preprinted. the longitudinal seam 2| is formed by bringin and in-which namely, by the use-of one or more pressure rolls. 35

Adhesive preferably, although not necessarily the lines of adhesive Ill and II carried along the thermoplasticin nfature, is printed,. by means of marginal edges of the blank, the band of adhesive suitable printing rolls to which adhesive is supalong the bottom of the bag is in effect a continua plied in any known manner on one surface of ation of the longitudinal seam 2| so that at no" the web of material from which the bags are to place in the bottom and longitudinal seam of the be formed. As will be noted a continuous line of bag is'there an absence of adhesive. If, however, H

\ bag.

.in this case the adhesive -in character.

the longitudinal seam had been formed in a conventional seam, that is, by overlapping the marginal longitudinal edges of the web, there would be no continuous line of adhesive from the bottom of the bag through and into the longitudinal seamof the bag. After the bag has been formed and filled with the desired material it may be readily sealed by adhering together the adhesive l4 carried in the blank along the top edges thereof and being present in the bag throughout the inner periphery of the top of the bag. Again when the, walls and gussets within e top area of the bag are secured together, ther will be present a continuous area of adhesive extending through the closure of the bag into and through the longitudinal seam of the bag, and in and throughout the bottom of the The above method of constructing a bag becomes of even greater importance when a liquidproof material is used in forming the bag. As will also be liquid proof If as in the construction above described there is a continuous band of adhesive joining the top closure and bottom of the bag, it

follows that a liquid and fluid-type bag is formed 4 because if the longitudinal seam were formed by Y overlapping the marginal edges of the web of material, the liquid-proof coating of the material would not be in contact throughout the seam and the danger of leakage through the seam either through wicking or great.

It will be appreciated by those skilled in the art that the principles of my present invention may be employed in the manufacture of all types of bags whether of the fiat, square or automatic opening type. Many modifications and variations in construction and arrangement may be made without in any way departing from the spirit or scope of my present invention, as defined in the appended claims which are to be broadly, construed. I claim:

. 1. In a method .for the manufacture of bags and the like, the steps which comprise printing a band of liquidproof adhesive along each of the longitudinal marginal edges of a single side of a web of liquidproof, flexible material and of adhesive into face to face other bands of liquidproof adhesive in spaced re-- lation transversely of the same side of said web, folding the web to bring the first named bands contact, forming a bondtherebetween, thereby forming a tube, and so severing said tube as to provide a plurality of bag blanks open at their en and having a continuous band'of adhesive located at one of said ends.

2. In a method for the manufacture of bags ineffective sealing would be and the like, the steps which comprise printing a band of liquidproof adhesive along each of the longitudinal marginal edges of a single side of a web of liquidproof, flexible material and other bands of liquidproof adhesive in spaced relation transversely of the same side of said web, folding the web to bring the first named bands of adhesive into face to face contact, forming a bond therebetween, thereby forming a tube, and severing said tube through each of said transverse bands'of adhesive to provide a plurality of open ended bag blanks carrying bands of adhesive adjacent their open ends and on the inner periphery thereof.

3. In a method for the manufacture of bags and the like, the steps which comprise printing a band of liquidproof adhesive along each of the longitudinal marginal edges of a single side of a web of liquidproof, flexible material and other bands of liquidproof adhesive in spaced relation transversely of the same side of said web, folding the web. to bring the first named bands of adhesive into face to face contact, forming a. bond therebetween, thereby forming a tube, severing said tube through eachof said transverse bands of adhesive to provide a plurality of open ended bag blanks carrying bands of adhesive adjacent their open ends and on the inner periphery thereof, and thereafter bonding the adhesive at one of the open ends of each blank to form a bag.

4. In a method for the manufacture of bags 'the steps which comprise: providing a continuous web of flexible fluidproof material;

a-single side thereof by applying thereto uous bands of fluidproof adhesive along the longitudinal edges of said single side and, at intervals, joining said longitudinal bands by lateral bands of fluidproof adhesive to outline consecutive areas on the same single side, each such treating contineach of area being bordered by the aforesaid longitudinal bands of'adhesive and bands of adhesive; folding said web so as to bring ,the longitudinal bands of adhesiveinto mutually contacting relation and causing adhesion between said bands to form a longitudinally sealed but transversely open, continuous tube having saidlateral bands of adhesive on the inner surface thereof; forming tubular blanks by severing said continuous tube along lines so located as to leave a portion, at least, of each transverse band of adhesive on each side of such line; and closing one end of each blank by treating the same, in the area of that portion of the transverse band remaining at such end of such blank, to cause the adhesive material of transverse band to form the blank.

a seal transversely of HARRY F. WATERS.

said portion of said 40 by a pair of said lateral

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