US 3223229 A
Description (OCR text may contain errors)
DeC- 14, 1965 G. J. o. WELIN-BERGER 3,223,229
PACKAGE FOR BREWING A BEVERAGE I Filed March 16. 1964 IN V EN TOR.
United States Patent Oice 3,223,229 Patented Dec. 14, 1965 3,223,229 PACKAGE FOR BREWING A BEVERAGE Guy John @lof Wellin-Berger, Box 228, Nacka, Sweden Filed lidar. 16, 1964, Ser. No. 352,210 Claims priority, application Sweden, Mar. 18, 1963, 2,920/63 1 Claim. (Cl. 206-0.5)
This invention relates to packages of the type comprising an envelope and a bag enclosed therein, said bag containing a material, such as tea leaves, for brewing a beverage. In previously known packages of this kind the envelope is in the form of a wrapping from which a part connected to the bag is to be separated for withdrawing the bag from the envelope. This part is used for holding the bag when it is to be immersed in the liquid, usually boiled water, used for brewing the beverage. The connection between said part of the envelope and the bag involves certain problems, especially because it must not be devised such that the beverage is likely to get a flavour of material comprised in the connection. Further, the manufacture of the envelope is involved with certain difculties because the envelope has to be constructed with a view of minimizing the manufacturing cost. As a matter of fact the cost of the bag and envelope has to be regarded as compared with the value of the portion of tea or other material that is enclosed in the package and constitutes the usable product thereof.
The object of the invention is to provide a package which satisfies high requirements and the invention also relates to a method `of manufacturing the package. In its broadest aspect the package according to the invention is characterized in that the part of the envelope remaining connected to the bag consists of opposite wall portions of the envelope which portions during closure of the envelope have been interconnected under the action of pressure and heat sealing or other bonding, said interconnected wall portions being adapted to be separated from the envelope when the envelope is opened. Consequently, separation of the part to be used for withdrawing the bag from the envelope and for handling the bag during brewing the beverage results in that the envelope will be automatically opened. Therefrom it follows that withdrawal of the bag from the package is an extremely simple procedure.
In a manner known per se a string may be used to conneet the bag with the remaining part of the envelope. Manufacture of the package is considerably facilitated if this string is fastened to the envelope between the interconnected wall portions thereof. In such case the string can be secured simply by being inserted between the wall portions so as to be secured therebetween when the wall portions are pressed together for closing the envelope.
In order to increase the steadiness of the remaining part of the envelope and to facilitate its separation from the remainder of the envelope, a reinforcing strip may be inserted between the interconnected wall portions and secured thereto by heat sealing or other bonding so as to form a label therewith. This label may be marked with a printed direction for use or advertisement.
The string may be of plastic and welded to the bag if the bag consists of a fabric or braid of plastic threads. If heat sealing is used to close the envelope the plastic string will be more firmly secured to the wall portions of the envelope due to the supply of heat.
In its broadest aspect the method of manufacturing the package is characterized by the steps of advancing a web of for instance paper, folding the web preferably about a longitudinal line, inserting bags provided with carrier strings successively in a row between the portions formed by folding, and forming an envelope around each bag by pressing said portions together and interconnecting them both along two lines extending transversely of the fold on either side of the bag and at the edges parallel to the fold after inserting the free end of the carrier string between said edges so as to secure said string to the edges while they are pressed together. To seal the bag, various kinds of binders may be used, not only heat sensitive binders in connection with heat sealing, but also contact adhesives which are cold setting provided they are applied to both surfaces which are to be brought into contact with each other.
An example of the application of the invention is illustrated in the annexed drawing in which FIGS. 1 and 2 are diagrammatic and perspective views of devices in two different steps of operation for carrying out the method according to the invention. FIG. 3 is a perspective view of an opened envelope and a bag withdrawn therefrom.
In the embodiment illustrated it is assumed that the bag itself which may contain tea leaves or the like for brewing a beverage consists of a fabric or braid of plastic threads and comprises two compartments 1, 2 in which a portion of tea or the like is distributed. The compartments are formed by interconnecting opposite walls of the bag along a central transverse line 3 (FIG. 3). Midway of this connecting line the bag is connected to the surrounding envelope 4 such as by means of a string 5 one end of which is secured to the bag and the other end of which is secured to the envelope. To connect the string with the envelope the end of the string is inserted between two opposite parts of the walls of the envelope as will be seen from FIGS. l and 2.
A web of paper or similar material is unwound from a supply roll 7 and passed beyond a guiding and folding device S by means of which the web or strip is folded along a longitudinal central line so as to be doubled up. Between the folded parts of the web which are to form the front and rear sides of the envelope there is successively inserted a plurality of bags provided with carrier strings 5. The compartments 1 and 2 are preferably facing each other such that a substantial part of the string will come to lie in the form of a loop between the compartments while the free end of the carrier string projects upwards betwen the upper edges of the compartments. Preferably, at the same time a reinforcing strip 10 is unwound from a supply roll 9 and advanced concurrently with the web 6 adjacent to the longitudinal edges of the folded parts. A binding agent may be applied to the web 6 and/or the reinforcing strip 10 on one or both sides which are to be facing each other. After a plurality of bags has been inserted between the walls formed by the web 6 these walls are pressed together, by means of a pair of backing plates 11, 12 or other members7 along two lines 14, 15 extending transversely of the fold of the web 6 and at the longitudinal edges parallel to the fold so as to form a seam 18. The string 5 inserted between the wall portions forming the seam is clamped between and connected with the wall portions when they are pressed together. The backing plate 12 may be provided with transverse knives 16 and the backing plate 11 has corresponding incisions 17. When the backing plates are moved together the knives 16 in cooperation with the incisions 17 will separate from the web 6 envelopes for the bags which have been inserted between the backing plates. At the Same time the envelopes are compressed and sealed along three edges thereof.
If a package of the kind described is to be used for brewing a beverage the seam 18 is torn from the remainder of the envelope which consequently will be opened. Then the bag can be easily withdrawn from the opened envelope by grasping the seam 18 and pulling the bag out from the envelope by means of the appendant string S. The seam and the string are then used for immersing the bag in the liquid for brewing the beverage.
In case of heat sealing for closing the envelope the backing plates, 11, 12 have to be heated to a suitable temperature. If a cold setting contact adhesive is used the backing plates may be cold. The devices illustrated in the drawing are intended to be used for intermittent advance of the web 6 and the reinforcing strip l0 with the length of each feed step corresponding to the width of three packages, but within the scope of the invention any desired lengths of feed steps are conceivable. Also continuous advancement is possible in connection with rotary sealing members generally devised in the same manner as the plates 11, 12. Even in other respects the invention is not limited to the details illustrated.
What is claimed is:
A package including an envelope, a bag for material for brewing a beverage enclosed in the envelope, and a string connecting said bag and a part of the envelope adapted to be separated from the lremainder thereof to allow the removal of the bag from the envelope, said part comprising opposite interconnected wall portions of the envelope, the bag and the envelope being rectangular, the edges of the bag being parallel to the adjacent edges of the envelope, the string having a substantial length of slack between its point of attachment to the envelope and its point of attachment to the bag, said point of attachment of the string to the bag being disposed on the side of the bag opposite the point of attachment of the string to the envelope, said bag being folded double along a septum which divides said bag into two commodity-receiving compartments with the fold remote from and parallel to the edge of the envelope to which the string is attached, the string being disposed between the folded halves of the bag.
References Cited by the Examiner UNITED STATES PATENTS 1,962,900 6/1934 Hirsch 20G-63.3 2,298,420 10/ 1942 Salfsberg. 2,313,512 3/1943 Brewer 206--63-2 2,525,651 10/1950 Clunan 53-28 2,965,225 12/1960 Zoller et al. 206-63.3 3,060,653 10/1962 Flax 53-28 THERON E. CONDON, Primary Examiner.
GEORGE O. RALSTON, Examiner.