US3014631A

US3014631A - Fruit lug liner

Info

Publication number: US3014631A
Application number: US781998A
Authority: US
Inventors: John C Fischer; Robert C Lovell
Original assignee: ST Regis Paper Co
Current assignee: ST Regis Paper Co
Priority date: 1958-12-22
Filing date: 1958-12-22
Publication date: 1961-12-26
Anticipated expiration: 1978-12-26

Description

Dec. 26, 1961 J. c. FISCHER ETAL FRUIT LUG LINER 3 Sheets-Sheet 1 Filed Dec. 22. 1958 Dec. 26, 1 961 J. c. FISCHER ETAL 3,014,531

FRUIT LUG LINER Filed Dec. 22., 1958 3 Sheets-Sheef 3 foe/ver United, States Patent St. Regis Paper Company, ration of New York Filed Dec. 22, 1958, Ser. No. 781,998 6 Claims. (Cl. Mil-14) New York, N.Y., a corpo- This invention relates to the packaging of delicate fruits in shipping lugs and more particularly in the provision of an improved combined one-piece liner and resilient cushion for installation in such lugs and the manufacture of the same by a continuous automatic process requiring no labor other than general supervisory attention.

Any of the more delicate fruits such as cherries, peaches, apricots, tomatoes and thelike having thin, easily severed skins are packaged and transported in shallow wooden lugs having thick end walls and their bottoms and sides formed by slats nailed to the end walls. Customarily there is a long narrow ventilating gap between the opposite side walls and the bottom; one or more similar narrow gaps may also be provided in the bottom of thelug. These gaps are particularly important when the lugs are closely stacked in transit or in storage for the purpose of permitting a relatively free flow of ventilating air. Such air flow serves to reduce spoilage as well as to prevent overheating, as well as to permit quick chilling after the fruit has been placed in storage or in refrigerator cars .for shipment to the point of use.

The described lugs are-customarily formed from rough sawn wood which easily severs the skin of delicate fruits. To avoid such damage as well as to protect the fruit against contact with the lug and additionally to provide desirable cushioning for the fruit during handling and shipment, it has been commonto provide an inexpensive throw-away liner. Various designs of such liners have been proposed heretofore but all are subject to certain disadvantages and shortcomings sought to be obviated by the present invention A particularly desirable type is formed from corrugated paper-because such paper not only .adds resiliency and protection to the fruit. from shock, vibration and the like, but because thecorrugated structure of the liner'facilita tes the passage of essential ventilating air. However, to make proper use of such ventilating capabilitiesit has been necessary to provide the liner with cutouts through which the air may pass to the interior of thelugL V The provision of such cutouts is attended by several serious problems, and. this is especially true of resilient type liners. One of these problems arises fromthe like lihood of the sharp .edgfls of the air passages cutting the tender skin of the fruit. Once the skin is broken, fruit juices escape soiling the liner and the lug. But of more serious consequenceis the fact thatYsuch skin rupture leads to rapid decay'and provides a rich culture for the rapid development of mold. These serious consequences can-be minimized by making the cutouts very small,

but this expedient so reduces the air port area as to defeat the purposes of the ports.

Another and more serious aspect of providing vendislodge the cutouts forcibly. This manual operation is both time-consuming and costly. Nevertheless, it has been mandatory in the provision of commercially saleable I liners.

By the present invention there is provided an improved resilient liner formed at high speed from corrugated sheet stock in a continuous process obviating the shortcomings and disadvantages of prior liners and of the methods of manufacturing the same. Preferably the corrugated sheet stock is formed as part of the continuous manufacturing procedure, one sheet being corrugated transversely and the crest on one exterior surface being coated with adhesive as these crests are pressed against a second flowing web of flat stock as this two-ply laminate is held assembled until the adhesive takes a set. The corrugated stock is then fed past a slitter station where irregularly-shaped slits are formed in properly spaced relation to provide a hinge in association with rows of large area ventilating passages opening into the lug only at the opposite lateral corners of the lug bottom. These slits are so arranged and contoured that folding of the liner therealong automatically forms the ventilating openings without need for blanking. any material from the body of the liner.

Furthermore, the material displaced to form the air passages is utilized to lock the liner assembled to the lug and for other purposes to be described hereinafter. The final processing operation comprises severing the advancing web into blanks of the proper width for in sertion intothe lug and guiding the liners so severed into a stack for wrapping and packaging. No hand operations or manual labor of any kind is required from the time the paper stock leaves the supply rolls until a sufilcient number of liners have been stacked and packaged for'removal to a place of storage.

Accordingly it is a primary object of this invention to provide an improved high-speed method and apparatus for making shipping lug liners without need for hand operations of any character. Another object of the invention is the provision of a method forcontinuously forming resilient lug liners featuring a pair of hinge lines crosswise of the individual liners which open to provide rows of ventilation passages as an incident to the assembly of the liner into a shipping .1 s-

Another object of the invention is the provision of an improved resilient lug liner having one or more. rows of irregularly shaped slits arranged in end-to-end spaced relation to form an easily-folded hinge line facilitating the rapid insertion of the liner into a lug with a minimum of elfort.

Another object of the invention is the provision of a method of making lug liners in a continuous process wherein substantially all portions of the paper stock are blanked into individual similar liners without waste or salvagev beyond that possibly required in trimming the lateral edges-of the web stock to size.

Another object of the invention is the provision of an improved resilient lug liner having ample provision for the flow of ventilating air through openings restricted to the inner lateral corners of the lug in alignment with tilating openings in corrugated. sheet stock is related to the resilient nature of corrugated paper thereby making it very diflicult to blank the cutouts at high speed. The

blanking dies normally employed comprise sharp edge I blades arranged to cut through the corrugated paper and remove the cutouts as the die retracts. However, such a high percentage of the cutouts tend to remain in the stock it is necessary to stack the blanks and to use manually manipulated jigs having plungers operable to the slat openings in the lug corners and of such size as not to provide cutting hazard to the tender-skin of delicate fruits. r

Another object of the invention is the provision of a lug liner adapted to be packaged flat and provided with parallel spaced hinging sections arranged, when assembled in a lug, to form a resilient central support underlying the bottom of the liner and featuring in addition a plurality of ventilating air inlets along the opposite lower corners of the lug.

Another object of the invention is the provision of a lug liner adapted to be packaged and shipped flat, and formed with hinge lines crosswise of the corrugated stock forming the liner in a manner providing a pair of of hinge sections includinglarge area ventilating openings and associated outwardly projecting lugs operable'to support the lateral bottom portions of the liner out of contact with the lug bottom as well as additional tangs engageable with the lug sides to lock the liner in assembled position therein.

These and other more specific objects will appear upon reading the following specification and claims and upon consideringin connection therewith the attached drawings to which they relate.

Referring now to the drawings in which preferred embodiments of the invention are illustrated:

FIGURE 1 is a diagrammatic representation in perspective of the liner manufacturing process;

FIGURE 2 is a fragmentary plan view on an enlarged scale taken from the corrugated face of the stock and showing one preferred type of slit employed in forming the hinge as well as the ventilating openings;

FIGURE 3 is a fragmentary cross-sectional view taken alongline 33 on FIGURE 2.;

FIGURE 4 is a perspective view of a typical shipping lug, a liner therefor being folded in readiness for insertion into the lug;

FIGURE 5 is a cross-sectional view through the lug on an enlarged scale and showing one lateral corner of the liner being inserted and the other lateral corner in readiness to be lowered into the assembly position of the liner;

FIGURE 6 is a view similar to FIGURE 5 on a slightly smaller scale showing the liner in fully assembled position;

FIGURE-7 is an enlarged fragmentary view through one lower corner of the lug after assembly of the liner;

FIGURE 8 is'a fragmentary top plan view of apparatus employed in forming a slightly modified liner construction;

FIGURE 9 is a perspective view of .the modified liner construction,,the liner being partially folded and in readiness for insertion into a lug; and

FIGURE 10' is a transverse sectional view through a lug with the modified liner in its fully installed position.

Referring more particularly to FIGURE 1, there is shown one preferred mode of manufacturing, by a con tinuous process, resilient lug liners incorporating the present'invention. Suitable apparatus for practicing the invention comprises a pair ofshaft's Hand 12 supporting supply rolls of

paper stock

13 and 14 passing into a corrugating and gluing apparatus of'conventional design and shown enclosed by ahousing 15. The details of the corrugating and gluing equipment are not shown but will be understood as comprising the'usual steam-heated corrugating roll effective to form transverse corrugations in a web 16 of stock advancing from supply roll 13. The corrugation crests on the lower side of web 16 are coated with a narrow band of adhesive byknown technique before being pressed into contact with the under-surface of a fiat non-corrugated web 17 advancing from supply roll 14. The resulting web of Z-plycorrugated paper 18 is then fed into an elongated oven 20 by-the aidof suitable guide rolls 21; 22'supported in any suitable manner to maintain the web 18 taut and properly centered between steam heaters or other suitable dryingchambers within oven 20.

As shown in FIGURE "1, the finished corrugated laminate issuing from the dryer has its corrugated side facing upwardly and its flat surface facing downwardly. However, it' is pointed out that these relative positions of the plies may be reversed. Usually the lateral edges of web 18 are irregular and slightly oversize. Trimming of these edges and the accurate dimensioning of the finished web is assured by the use of

trimmer knives

25, 25 carried on a shaft 26 preferably operating in conjunction with a back- 4 up roll 27 effective to hold the web in firm contact with the trimmer knives.

Web 18 next passes past a pair of slitter rolls 28, 28 appropriately spaced on a supporting shaft 29. The peripheral edge of slitter rolls 28 carry irregularly con toured

slitter knives

30, 30 here shown as being of set pentine shape and understood as operating in conjunction with resilient'back-up rolls on the rear side ofthe web and not visible in FIGURE 1. I Although slits 31 may take numerous shapes, a particularly desirable shape comprises a 270 degree length of a medium amplitude sine wave, each such slit being indicated at31 and shown on a greatly enlarged scale in FIGURE 2. Each 270 degree slit includes three crests. An important feature of the slit is that the adjacent ends 32, 32 of consecutive slits 31 are spaced apart a sutficient distance to form a hinge axis represented by dotted line 33 in FIGURE 2. It is to be noted thatterminal ends 32, 32 of adjacent slits are not only in axial alignment but are positioned intermediate parallel lines drawn through the crests of these slits. Preferably, but not necessarily, the hinge axis is midway between the described lines through the crests of the slits. It will be understood that slits 31 extend entirely through corrugated web 18.

After passing through

slitters

30, 30 web 18 may pass about a guide roll 35 and into a combined feed roll and cutter mechanism generally designated 36. This mechanism preferably includes feed rolls pressed against the opposite sides of web 18 and mating therewith in a manner effective to pull the Web past the various processing stations. Also included in mechanism 36 is a knife roll for severing web 18 into individual liners 39 of uniform size with the width corresponding to the interior length of a lug into which the liner is to be installed. The finished liners are shown stacked at 37 on a pallet 38 in readiness for wrapping and packaging.

Referring now to FIGURE 4, one of the completed liners 39 is shown with its

side panels

40, 41 folded upwardly toward one another along hinge axis 33 interconnecting the adjacent ends of each row of slits 31. Note that side panel 41 is folded past its upright position to a position closely adjacent central panel 42 of' the liner, whereas side panel 40 is folded somewhat short of its upright position.

A typical lug into which the liner is adapted to be inserted is shown in'FIGURE 4 as comprising a wooden

box'having end walls

43, 43, a bottom panel 44, and a pair of side panels 45. Each of these panels is somewhat narrower than the width of the end'walls to which they are attached, as by nails or other suitable fasteners. Bottom panel and side 'panels 45 cooperate to provide long

narrow slots

46, 46 at the opposite lower corners of the lug through which a plentiful supply of'ventilating air may pass. Also the top edges of side panels 45 preferably terminate below the top of end walls 43 to provide free outletsfor air, particularly-incases where the lugs are stacked one on top of theother as they commonly are while in storage or in transit;

The assembly of the flat liners 38 is accomplished in the manner made clear by FIGURES 4, 5 and 6. Thus, the operator grasps a liner 39 by taking hold of the midlength of each

side panel

40, 41 and folding the smoothsurfaced side of these panels toward one another about hinge axes 33. Side panel 41 isfolded past the upright position to that shown in FIGURE 4 after which the hinge portion thereof is inserted through the right-hand slot 46 of the'lug as viewed in FIGURE 5. When so positioned, the opposite edge of bottom panel 42 maybe pressed downwardly past the inner surface of the adjacent side wall 45 and against the interior bottom of the lug as side panel 40 is folded to its upright position to lie flush against lug side panel 45.

In the fully installed position of liner 39, tangs 47 integral with bottom panel 42 project beyond the inner surfaces of side walls 45 to underlie the lower edge of these walls and thereby lock the liner assembled to the lug.

Likewise, tangs 48 integral with

side panels

40 and 41 lie in the same plane as

side panels

40 and 41 and project downwardly into slots 46 of the la .The described displacement of

tangs

47, 48 forms large half-circularventilating air passages 49; 49 providing free: and unobstructed air flow through slot 46 upwardly into'ithe interior of the lug. Moreover, it is pointed out that the edges of passages 49 are spaced so closely to the lower lateral corners of the lug it is difficult or impossible for the fruit contents of the lug to contact these edges with sufiicient pressure to sever the skin. Furthermore, substantially all corrugations of the liner areprovided intermediate their opposite ends with openings in communication with slot 46 of the lug so that other portions of the ventilating air are free to circulate between the inner face of the'liner and the inner walls of the lug. Cooling and ventilating of the lug are thereby facilitated and assured.

Referring now to FIGURES 8 to 10, there is shown a modified embodiment of the invention wherein the same or similar parts'are" designated by the same reference characters as in' the first described form but distinguished therefrom'by theaddition of apn'me. This embodiment differs in s everal important respects. In the first place, it will be *observed that web 18 is sufiiciently wide to form more'than one row of liners at the outlet end of the processing machine. Furthermore, each row of liners is of sufiicient breadth lengthwise of the corrugations as to permit formationof a foldable midsectio-n centrally of the bottom panelwhen the liner is assembled in a lug.

The foldable central section will be best understood by reference to FIGURES 9 and 10 showing the bottom 42' of liner 39' formed with a C-shaped fold 50 centrally of its bottom. The formation of fold 50 is facilitated by the provision of two pairs of

parallel score lines

51, 52 crosswise of the corrugations of each liner, these score lines being formed by crowned rolls 53 bearing against the advancing web. Rollers 53 are suitably mounted on a shaft 54.

Score lines

51, 52 are so positioned that in the assembled folded position of the liner, its bottom portion 42 is resiliently supported in spaced relation to lug bottom 44 in the manner best illustrated in FIGURE 10.

As will be observed from FIGURE 8, the processing equipment includes slitter rolls 28 provided in its peripheral edge with serpentine slitting knives 30' for forming slits 31'. The machine also includes trimming knives 29 to cut away salvage from the opposite edges of web 18' as well as a central knife 25' operating to divide the web into two identical strips from which the liners are severed as they pass through the liner cutter mechanism, not shown, but similar in construction and function to mechanism 36 of the first described embodiment.

Liners 39' are assembled to shipping lugs differing from the lugs shown in FIGURES and 6 primarily in that bottom 44' is formed in two separated halves with their remote outer edges terminating generally opposite the inner faces of side walls 45.. The purpose of thislug assembly is to enable lug bottom 44' to underlie and support the downwardly extending tangs 48', 48' of

liner side panels

40, 41. Accordingly, it will be clear, as is shown in FIGURE 10, that all portions of liner bottom 42 are supported in closely spaced relation to the lug bot-tom, this support being provided in part by tangs 48' and, in part by G-shape fold 50 centrally of liner bottom 42. Thus tangs 48 cooperate with the 0-fold 50 to provide additional protection and vibration-absorbing resiliency for delicate fruits during shipment and handling.

Liner 39' is assembled within the lug in the same manner described above in connection with the first described embodiment. In the installed position of the liner, outwardly projecting tangs 47, 47' underlie the lower edges of side walls 45' thereby positively locking the liner assembled to the lug. Likewise, the opening of tangs 47, 48' away from the adjacent side walls of the liner provides passages 49 for admitting large volumes of air to the lug and to the space underlying the smoothsurfaced interior surfaceof the liner.

While the particular one-piece liner and resilient cushion and method of making the same herein shown and disclosed in detail are fully capable of attaining the objects and providing the advantages hereinbefore stated, it is to be understood that they are merely illustrative of the presently preferred embodiments of the invention and that no limitations are intended to the details of construction or design herein shown other than as defined in the appended'claims.

We claim:

'1. An article of manufacture comprising a one-piece generally fiat rectangular plaque of resilient sheet stock having its opposed edges parallel to one another and adapted to be assembled against the bottom and opposite side walls of a fruit shipping lug to form a resilient protective liner for delicate fruits while being handled and while in transit, said linerhaving a central portion joined by a pair of hinges to a pair of similar laterally disposed side panels, said hinges each comprising irregularly shaped slits arranged in end-to-end spaced-apart relation with the ends of the slits in each row in substantial alignment and so disposed relative to the intervening portions of said irregular slits that the folding of said panels toward one another forms large area ventilating air openings through said liner in the gaps between juxtaposed edges of individual slits, said ventilating air openings beingclosely spaced and in aligned communication with the long narrow gap along either lower corner of a conventional wooden fruit lug, said slits being serpentine in shape with the ends of the slits in each row terminating adjacent a common straight hinge line lying generally centrally between the crests of said slits, whereby said side panels tend to fold along lines passing through the ends of said slits causing the serpentine ends of said slits to open away from one another and form large area air passages through said liner, and said article of manufacture being further characterized in that the portions of said liners bordering said slits remain in the plane of the central panel of the liners and form tangs projecting beyond the side panels of the liner when folded to lie at right angles to said tangs, said projecting tangs being adapted to project into the gaps normally found in the opposite lower corners of fruit lugs and cooperating with edges thereof to lock the liner assembled to the lug.

2. In a fruit lug of the type having narrow ventilating slots opening laterally through its lower lateral side corners, that improvement which comprises a combined liner and cushion constructed from a one-piece fiat rectangular plaque of resilient sheet stock having a central panel corresponding in shape and size with the interior bottom of said fruit lug and including narrow side panels hinged to either longer edge of said central panel, sinuous cuts along said hinge providing tangs along each hinge which tangs are integral with and lie in the plane of said central panel, the overall width of said tangs and central panel being greater than the interior width of the lug, whereby said tangs project into said ventilating slots and are engageable with the upper edges of said slots to lock said liner assembled to the lug.

3. The combination defined in claim 2 characterized in that said plaque is formed of corrugated sheet material having the corrugations thereof extending crosswise of the hinges between said side panels and said central panel.

4. The combination defined in claim 3 characterized in that said sinuous cuts forming said hinges are arranged in spaced-apart end-to-end relation to provide hinging connections between said side and central panels, said sinuous cuts cooperating to provide said tangs, some of which project horizontally and the remainder of which project vertically into the narrow ventilating slots along the lower lateral corners of the lug when said liner is assembled into the lug and cooperate with the associated edge of said slots in locking said liner against displacement relative to both the bottom and the side walls of said lug.

5. The combination defined in claim 2 characterized in that said central panel is provided lengthwise of its median portion with four parallel creases arranged to fold and provide an upwardly opening C-shaped pleat, said pleat providing a resilientsupport for the central panel portion of the liner and having a tendency to unfold and thereby to urge the lateral edges of said central panel and the tangs associated therewith outwardly into said ventilating slots and into positive locking engagement with the overlying edges of these slots.

67 An article of manufacture comprising a one-piece generally fiat rectangular plaque of resilient sheet stock having its opposed edges parallel to one another and adapted to be assembled against the bottom and opposite side walls of a fruit shipping lug to form a resilient prote'ctive liner for delicate fruits while being handled and while in transit, said liner having a central portion joined by a pair of hinges to a pair of similar laterally disposed side panels, said hinges each comprising irregularly shaped slits arranged in end-to-end spaced-apart relation with the ends of the slits in each row in substantial alignment and so disposed relative to the intervening portions of said irregular slits that the folding of said panels toward one another forms large area ventilating air openings through said liner in the gaps between juxtaposed edges of individual slits, said ventilating air openings being closely spaced and in aligned communication with the long nar- ,row gap along either lower corner of a conventional wooden fruit lug, each slit being shaped to form at .least two tangs projecting in opposite directions, the ends .of

the slits in each row terminatingadjacent .a common straight hinge line lying between .the ends of said tangs, whereby said side panels tend tofoldalong linesvp'ass ing through the ends of said slits and traversing said tangs causing the ends of said slits to open away 'fronroneanother and form large area air passages through said liner, and said article of manufacture being further characterized in that the portions of said liners bordering said slits remain in the plane of the central panel of the liners and form tangs projecting outwardly away from and beyond the side panels of the liner when folded to lie at right angles to said tangs, said projecting tangs being adapted to project into the gaps normally found in the opposite lower corners of fruit lugs and cooperating with edges thereof to lock the liner assembled to the lug.

References Cited in the file of this patent UNITED STATES PATENTS 1,169,238 Clenny Ian. 25, 191,6 1,705,267 Pohlrnan Mar. 12, 1929 1,757,087 Holbrook May.6, 1930 1,816,321 Foss July 28, 1931 2,701,088 Tyrseck .Feb. 1, 1955 2,743,050 Crane Apr. 24, 1956 2,765,714 Wischusen Oct. 9, 1956 2,783,692 Bolding Mar..5, 1957 2,835,428 .Herzog May 20, 1958 2,867,367 Butz Ian. 6, 1959