US 2364903 A
Description (OCR text may contain errors)
Dec. 12, 1944. HQWARD 2,364,903
BAG FOR INFUSING MATERIAL Filed Aug. 16 1941 INVENTOR l ATTORNEY Patented Dee.12,1944
BAG FOR INFUSING MATERIAL Stanley R. Howard, Milton. Masa. asslgnor to Pneumatic Scale Corporation, Limited, Quincy, Mass, a corporation of Massachusetts Application August 16, 1941, Serial No. 467,164
1 Claim. (Cl. 99--77.1)
This invention relates to a tea or coffee bag and to a method of making the same.
One object of the invention is to provide a novel tea or coffee bag of novel construction adapted to be produced in a novel and economical manner.
Another object of the invention is to provide a novel and improved bag of the character described having a handle secured thereto in a simple, practical and economical manner.
A further object of the invention is to provide a novel and practical method of making the present improved tea or coffee bag.
With these general objects in view and such others as may hereinafter appear, the invention consists in the package and in the method of making the same hereinafter described and particularly defined in the claims at the end of this specification.
In the drawing, Figs. 1, 2 and 3 are perspective views illustrating different forms of strips adapted to be embodied in the present package to form a handle therefor; Fig. 4 is a plan view of a blank of bag forming material from which the present bag may be constructed; Fig. 5 is a front elevation with portions braken away of a completed bag embodying the present invention; Fig. 6 is a cross-sectional view taken on the line 6-6 of Fig. 5; Fig. 7 is a perspective view illustrating a step in the method of forming a modified form of the present bag; Fig. 8 is a perspective view of the bag shown in Fig. 7 after completion; Fig. 9 is a plan view of a blank of bag forming material from which another modification of the present invention may be constructed; and Fig. 10 is a front elevation of a completed bag formed from the blank shown in Fig. 9.
In general, the present invention contemplates the production of a container for tea or coffee formed by folding a rectangular blank of bag forming material to form two half sections and joining the edges thereof, preferably by a heat sealing operation, after a quantity of the com modity has been deposited in the bag. The bag forming material preferably comprises a suitable.
grade of paper of porous structure so as to permit extraction of the tea or coffee therethrough. In accordance with one feature of the present invention, a handle comprising a flexible mem- Fber such as a string is attached to the bag by interposing a portion of the flexible handle between the edges of the bag section prior to sealing thereof and thereafter closing and sealing the edges to close the bag and to attach the flexible handle thereto. In one embodiment of the invention as herein illustrated, the handle is preferably provided with a coating of thermolastic adhesive and the handle thus prepared is interposed between the free edges of the .bag which may be free of adhesive and then the structure may be heat sealed to close the edges of the bag and to seal the handle therebetween. In practice, a tag may be provided on the extended end of the string which may be attached thereto by heat sealing or otherwise.
The invention also contemplates a novel method of making a bag and particularly of closing the top of a bag which comprises the interposition of a thermoplastic strip between the top edges of the bag and thereafter heat sealing such edges by the application of heat and pressure to render the adhesive plastic and to adhesively secure the top edges together.
Referring now to the drawing and particularly to Figs. 4 and 5, one embodiment of the invention as therein illustrated may comprise a rectangular blank ill of bag forming material preferably a paper web provided with bands I2, i l of thermoplastic adhesive along the longitudinal edges thereof. In the process of making the bag, the rectangular blank is folded along a medial line l6 to form two half sections and to present the adhesive coated side edges H, H f the bag together, whereupon the side edges are heat sealed and a quantity of the tea or coffee is deposited within the bag through the open top thereof.
In the embodiment of the invention shown in Figs. 4 and 5, the top edges of the bag are free from adhesive, and provision is made for sealing the top edges of the bag by interposing therebetween a handle l8 provided with a. coating of thermoplastic adhesive. The handle may take various forms as illustrated in Figs. 1 and 2, and may comprise an ordinary piece of twine 20 provided with a coating of heat sealing adhesive 22 or may comprise a flat band or ribbon M of paper or other suitable material provided with a similar coating 22 of thermoplastic adhesive. The portion of the handle interposed between the top edges of the bag is thereafter subjected to heat and pressure to render the coating on the handle adhesive thus forming a bond between the top edges of the bag and sealing the attached portion of the handle therebetween. The extended portion of the handle, as herein. shown, is preferably provided with a tag 24 which may be heat sealed or otherwise attached thereto.
Referring now to Figs. 3, 7 and 8, a. modified form of the present invention may comprise a rectangular blank, similar to that shown in Fig. 4, which is folded and heat sealed along its side edges 26, 28 leaving the adhesive free top edges 3Il-of the bag open, as illustrated in Fig. 7. After a charge of material has been deposited in the bag through the open top thereof, a heat sealing strip 32, see Fig. 3, formed entirely of thermo-plastic material, is interposed between the top edges and heat sealed thereb'etween to provide a firm bond 34 between the top edges of the bag, as illustrated in Fig. 8.
The above described embodiment of the invention lends itself particularly to the automatic production of the bags wherein the bags areformed in a continuous strip by folding an elongated web of the bag forming material longitudinally and thereafter the strip is sealed at spaced transverse portions to form bag sections having a closed bottom and open at the top. As the strip of bag sections is continuously advanced, th eeindividual bag sections are provided with a charge of the commodity being packaged t ough the open top thereof. The bag forming ma rial is preferably unwound from a roll thereof, and in the embodiment of the invention herein contemplated, the thermo-plastic strip 32 may likewise be provided in roll form andimwound therefrom to present the string betwee the open to? edges of the strip of connected bag sections as it is being advanced. After the commodity has been deposited into the bag sections, the tops of the bags may be heat sealed, whereupon the bag sections may be severed from the strip to form individual filled bags.
It will be apparent that a similar process of forming the bags in a continuous strip may embody a thermo-plastically coated string as shown in Fig. 1 to provide a package having a. top closure comprising a section 20 of string sealed between the top edges of the bag by the application of heat and pressure to render the coating 22 thereon adhesive.
Another embodiment of the invention, as illustrated in Figs. 9 and 10, may comprise a rectangular blank 40 of bag forming material provided with bands of thermo-plastic adhesive 42 along all four edges. on the medial line H and sealed along the side edges 48, 48, leaving the top edges open. A quantity of the commodity being packaged is then introduced into the bag, and a handle 52 comprising either a plain, uncoated string or a thermoplastically coated string is interposed between the open top edges 50 of the bag. Upon the application of heat and pressure, the portion of the handle 52 interposed between the top edges 5|! is firmly attached to the bag and the top edges of the bag are sealed. The extended portion of the string may be provided with a tag 64 as illustrated in Fig. 10.
As a modified form of the above described embodiment of the invention, a handle comprising a plain uncoated piece of twine 56, as illustrated in dotted lines in Fig. 10, may be interposed between the edges of the thermo-plastically sealed bag at one corner thereof, as shown, so as to interlock one endrof the handle between the heat sealed top edges. The other end of the handle may likewise be provided with a tag 54.
While the preferred embodiment of the invention has been herein illustrated and described, it will be understood that the invention may be embodied in other forms within the scope of the following claim.
Having thus described the invention, what is claimed is: I
As a new article of manufacture. a bag of thin porous paper adapted to receive an infusing material therewithin. said bag having the side edges thereof secured together, and means providing a seal-for the top of said bag including a handle comprising a length of fibrous material coated throughout the length thereof with thermoplastic material, said handle of fibrous material including a portion extending across the mouth of said bag between the top edges thereof with said coating, when the top of said bag is in a sealed condition, serving to bond said top edges to said handle and to bond said edges together at least above said handle.
STANLEY R. HOWARD.
In making the bag, the blank is folded-