CA1155046A - Machine for wrapping elongated articles in plastic film - Google Patents

Machine for wrapping elongated articles in plastic film

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Publication number
CA1155046A
CA1155046A CA000360988A CA360988A CA1155046A CA 1155046 A CA1155046 A CA 1155046A CA 000360988 A CA000360988 A CA 000360988A CA 360988 A CA360988 A CA 360988A CA 1155046 A CA1155046 A CA 1155046A
Authority
CA
Canada
Prior art keywords
rotatable member
grooves
plastic film
elongated articles
drum
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
CA000360988A
Other languages
French (fr)
Inventor
Toshi Maruyama
Masami Takine
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tetra Pak AB
Original Assignee
Tetra Pak International AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tetra Pak International AB filed Critical Tetra Pak International AB
Priority to CA000360988A priority Critical patent/CA1155046A/en
Application granted granted Critical
Publication of CA1155046A publication Critical patent/CA1155046A/en
Expired legal-status Critical Current

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  • Wrapping Of Specific Fragile Articles (AREA)

Abstract

ABSTRACT OF THE DISCLOSURE

A machine for the production of a web with indi-vidually wrapped drinking straws from two separate plastic films is disclosed. The machine includes a rotatable drum around which one of the plastic films is led and simultan-eously given a corrugated form. The drinking straws are thereafter placed one by one in the recesses in the corrugated form, and the second plastic film is applied and heat-sealed to said corrugated first film so that the drinking straws are completely enclosed in air-tight packages.

Description

~ssQ46 The present invention relates to a machine for wrapping elongated articles in plastic film.

A commonly used packing container of paper and plastic for packaging fruit juice, milk and other liquid products, is often provided with a drinking straw a~tached to the side of the container, and the straw is generally wrapped in a cover for sanitary reasons.

The present invention relates to a machine in which an elongated article such as a drinking straw may be enclosed or wrapped in a sanitary cover in an automatic and efficient manner by using two web-shaped plastic films.

The following description of an embodiment of the machine in accordance with the present invention will be made with reference to the enclosed drawings, wherein like members bear like reference numerals and in which:

Figure 1 is a general sideview of a machine in accordance with the present invention, Figures 2 and 4 are enlarged portions of the machine of Figure 1, Figures 3 and 5 are enlarged front views of the main portions of Figures 2 and 4, Figure 6 is a sectional view taken along the section line VI-VI in Figure 4, Figure 7 is a front view of a fixed disc used in the present invention, ~' Figure 8 is an enlarged view illustrating how the film is arranged along the periphery of a rotatable member, ~155Q46 Figure 9 i5 a section view taken along the section line IX-IX in Figure 4, Figure 10 is a front view illustrating the sealing operation, Figure 11 is an enlarged longitudinal section view of Figure 10, Figures 12-15 are enlarged views illustrating the process of wrapping the drinking straws, Figure 16 is a perspective view illustrating a band enclosing drinking straws arranged in parallel relationship at predetermined distances from each other, Figure 17 is an enlarged perspective ~iew of the main portion of Figure 16, which portion is shown in section and Figure 18 is a perspective view of a packing container provided with a wrapped drinking straw produced with the maahine in accordance with the invention.

With reference to Figure 1 a number of elongated articles such as drinking straws are contained in a hopper 1 having a V-shaped section. Said drinking straws are adapted to fall down by the gravity force one by one in a vertical passage 2 communicating with the outlet of the hopper.
; The hopper 1 is provided with movable blades 3 adapted to be swung around a shaft 3a in a reciprocating movement, whereby the movement is limited to a predetermined range by means of a mechanism 4, in such a way that the blades 3 are moved within the range defined by a solid line and a dotted line. The movement of the blades 3 will permit the drinking straws B to fall down one by one in the passage 2.

i~$5~46 Approx. at the middle of the passage 2 a rotatable member 5 provided with a plurality of brushes Sa is located. Said bxushes 5a will pass through a channel 2, and when the member 5 is rotated at high speed the brushes will force each drinking straw B to the end of the channel. Such a rotatable member 5 is very efficient, especially when the elongated articles fed through the channel 2 are light-weight drinking straws B.

A rotatable member 6 is located below the passage
2 and said member 6 is provided with a plurality of grooves 6a arranged at regular intervals around the periphery of the member 6. The drinking straws B fall down through the passage 2 and collected one by one in each of the grooves 6a. A
~uide surface 7 is arranged near the outside of the rotatable member 6 (at the left hand in Figures 1 and 2), in such a way that it will cover a part of the rotatable member 6.
Thus the guide 7 prevents the straws B received in and con-veyed by the grooves 6a from falling out from the grooves ~uring the transportation. A rotatable member 8 which is located below the rotatable member 6 is provided with a plurality of grooves 8a at regular intervals in the same manner as the rotatable member 6.

Between the grooves 8a pressure pads 8b are embedded along the periphery of the rotatable member 8. Those pressure pads 8b are adapted to be brought into contact with the ; peripheral surface of a heater drum 11, which is discussed later.

The rotatable member 8 is furthermore provided with a plurality of holes 8c (Figures 6 and 8) which are passing through the rotatable member 8 in an axial direction. Each of the said grooves 8a is provided with a hole 8c which extends in an axial direction from one end of the rotatable member 8 and ends near the opposite end surface of the rotatable member 8. Said holes 8c are consequently not passing through . ~55~6 the rotatable member 8 but will form a "dead end channel"
which is connected with its groove 8a by means of a plurality of radially arranged channels 8d.

The side of the rotatable member 8 provided with the openings of the holes 8c is always in contact with a fixed disc 9. This disc 9 is provided with a front surface (the left hand surface in Figure 6) with a groove 9a forming a semi-circle at the position corresponding to the openings of the holes 8c in the rotatable member 8 (Figures 4 and 7).
The groove 9a is designed in such a way that its deepest section is located at the starting end of the groove 9a (at the left end in Figure 7). The deep of the groove 9a will then shallow towards the terminal end thereof. The groove 9a is connected to a vacuum source ~not shown) so that a suction force is adapted to exert onto the grooves 8a through the groove 9a, the holes 8c and the channels 8d.

In accordance with the arrangement described the greatest suction force is applied at the starting end of the groove 9a where the groove has its largest depth, which means that the greatest suction force will exert on the groove 8a located at the position corresponding to the starting end of the groove 9a. The grooves 8a will be subjected to a weaker suction force as the force reaches the terminal end of the groove 9a by the rotation of the rotatable member 8. No suction force is exerted onto the grooves 8a at the position of the disc 9 where the groove 9a is not formed.

A drum 10 for pushing a film Cl into the grooves 8a is arranged adjacent to the rotatable member 8, and the heater drum 11 is adjacently arranged at the side opposite the drum 10 in relation to the rotatable member 8 (Figure 4).

The drum 10 is provided at the periphery thereof with a plurality of projecting members lOa at regular inter-~L~55~46 vals. Said members are adapted to engage with the grooves 8a into the rotatable member 8.

The film Cl which is rolled onto a storage roll, is adapted to be fed in between the rotatable member 8 and the drum 10 and to be continuously pressed down in the grooves 8a. When the film Cl is pushed or pressed into the grooves 8a by the projecting members lOa the film is held against the inner surface of the grooves 8a by the suction force exerted on the grooves 8a. Here it is to be noted that the film cl is stretched over the pressure pads 8b owing to the fact that the parts of the film which are pressed into the grooves 8a~are kept in position by the suction force.

The heater drum 11 is provided at the periphery thereof with a plurality of projections 112 at regular intervals, and such projections lla are adapted to come into contact with the pressure pads 8b. This heater drum 11 is arranged for heat-welding the film Cl to another film c2 in a welding area along the drum 11. With reference to Figure 9 the heater drum is rotated at the outside of a fixed heater 12 and is heated by radiant heat from the heater 12. At the outside of the periphery of the rotatable member 8 two guiding bars are arranged between the rotatable member 6 and the heater drum 11 in order to cover a part of the periphery of the rotatable member 8. With reference to Figure 6 one end 13a of these guiding bars 13 is arranged in peripheral grooves 6b formed along the periphery of the rotatable member 6. A rGller 14 is arranged below the heater drum 11 (Figures 1 and 4) and after this roller (at the right hand in Figure 1) a sealing device for a longitudinal seam is arranged. With reference ta Figure 11 this sealing device comprises one lower rotatable member 15 and two upper heater drums 16.
The rotatable member 15 is provided with peripheral ~55~:)46 projecting portions 15a adapted to co-operate with the heater drum. Said peripheral projecting portions 15a are arranged so as to come into contact with peripheral projecting portions 16a disposed around the periphery of the heater drum 16. By such contact the films Cl and c2 which are brought in between said rotatable member 15 and said heater drum 16 will be heat-welded and "melt cut". In the same way as the heater drum 11 the heater drums 16 are rotated along fixed heaters 17 and adapted to be heated by radiant heat from the fixed heaters 17.

Provisions are made so that all of the rotatable members 6 and 8, the drum 10, the heater drum 11, the rotatable member 15 and the heater drum 16 will be rotated in a syn-chronous manner with each other.

With further reference to Figure 1 further elementsare arranged, e.g., a take-up 18, tension means 19 by means of which the film Cl may be fed under strain, and a take-up roll for taking up the sealed edges D.

The films Cl and c2 to be used for packing of elongated articles B such as drinking straws according to the present invention, have a width which is larger than the length of such drinking straws B.

While the films Cl and c2 are continuously fed from storage rolls the film Cl will be formed and held by and between the rotatable member 8 and the drum 10 and contin-uously wound onto the periphery of the rotatable member 8~At this time portions of the film Cl are pushed into the grooves 8a of the rotatable member 8 by the projecting members lQa of the drum 10, and stick to the inner surfaces of the of the grooves 8a due to the suction force exerted onto such grooes 8a by SUCtiQn means (not shown), as shown in Figure 8. Thus the rotatable member 8 goes on rotating during a continuous forming of the film C .

~55~46 On the other hand the straws B are fed one by one from the hopper 1 to the passage 2. When the straws have fallen down through the passage 2 the straws B are received, also one by one, in the grooves 6a arranged in the rotataing member 6, which member is located below the passage 2 and rotated counter-clockwise (Figures 1 and 2).

The straws are kept in the grooves 6a by a guiding member 7, which guiding member is covering about 180 of the periphery of the member 6. At the lower most end of the rotating member 6, wherein the support by the guiding member 7 no longer exists, the straws are removed from the grooves 6a in a downward direction by the front end 13a of a guide bar 13 in the way indicated by dotted lines in Figure 5, and the straws are subsequently transferred into the grooves 8a in the rotatable member 8 arranged just below the rotatable member 6.

As the film Cl already has been arranged around the rotatable member 8 and is pushed down into the grooves 8a the straws B will be embedded in the film Cl and covered by the film with the exception of the top-side of the straws (Figure 12). After being pushed into the grooves 8a the straws B are conveyed to the position opposite the heater drum 11 by the rotatable member 8. ~ere, it is to be noted that during the rotation of the rotatable member 8 the straws B will not fall out from the grooves 8a as straws B
are kept in place by the guide member 13.

The film c2 is fed between the rotatable member 9 and the heater drum 11 and as shown in Figure 13 the film C
covers those portions of the straws B which have not been coyered by the film Cl. Thus the straws B are now wholly enclosed between the films C and C
The contact between the pressure pads 8b of the ~5504~

rotatable member 8 and the projections lla of the heater drum 11 cause the films Cl and C 2 to be welded together with each other along the contact zones E transverse to the longitudinal directions of the films Cl and c2 (Figures 16 and 17).

In order to reinforce the sealing portions E the projections lla and the pressure pads 8b can be provided with discontinuities which will form grooves or indentations in the sealed zone E.

The formed band C3 containing the straws is the~
conveyed between the rotatable member 15 and the heater drum 16 over a roller 14. By means of the contact between the projecting portions 16a of the heater drum 16 and the peripheral projecting surfaces 15a the two lengthwise edges of the band C3 are melt-welded and at the same time edge portions D are cut and removed from the band C .

Thus the straws B are completely packed and enclosed between the two films Cl and C2. As the process described is repeated the packing band C containing the straws B will be continuously produced with the straws arranged at regular intervals, and the said band C3 is then continuously wound on a drum 18. The band C3 containing the straws can then be cut in the sealed portions E to provide a package in which one single straw is packed. Such cutting may be performed in an automatic manner by usung a cutting machine.

The wa~te material from the edges D, which is in a band-shape may be removed and rolled in a take-up roll 20.

According to the present invention packaging of elon~ated articles such as drinking straws with the help of two films may be performed in an automatic and very efficient manner. The use of band-shaped films will make ~$5(~46 t possible to produce a band-shaped package, in which the drinking straws are packed in a continuous manner in an efficient way.

' :

Claims (5)

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An apparatus for wrapping elongated articles in plastic film, comprising means for individually passing said elongated articles sideways in a channel, a first rotatable member having on the periphery thereof grooves each formed such that said elongated articles will fit therein, a second rotatable member provided with axially directed grooves along its periphery, said second rotatable member being located between said channel and said first rotatable member, said second member being immediately below an outlet of said channel which is aligned with said grooves of the second rotatable member, said second rotatable member being adapted to transfer the elongated articles from the outlet of said channel to the grooves arranged along the periphery of said first rotatable member, means for arranging a first plastic film in close contact with both the periphery and the grooves of the first rotatable member, means for applying a second plastic film over said first film and over said grooves, a first heater drum adapted for sealing said second plastic film to said first plastic film along selected transverse zones between said elongated articles, and a second heater drum for subsequently sealing longitudinal edges of said second plastic film to longitudinal edges of said first plastic film whereby said elongated articles are individual-ly sealed between said first and said second plastic films.
2. The apparatus in accordance with claim 1, wherein said means for arranging the first plastic film comprises a rotatable drum provided with elements protruding from the peripheral surface of the drum in the radial direction of said drum, said protruding elements having substantially the same shape and size as said grooves in the first rotat-able member and being adapted to push said first film into said grooves in the first rotatable member such that the first film will be arranged in close contact with both the peri-phery and the grooves of said first rotatable member.
3. The apparatus in accordance with claim 1, further comprising guiding bars arranged along a portion of the outer peripheral surface of the first rotatable member between the location at which the elongated articles are transferred to the first member and the heater drum for maintaining the elongated articles within the grooves in the first rotatable member.
4. The apparatus in accordance with claim 1, further comprising a guiding member arranged along a portion of the outer peripheral surface of the second rotatable member be-tween the channel outlet and the first rotatable member for maintaining the elongated articles within the grooves in the second rotatable member.
5. The apparatus in accordance with claim 1, wherein each of the grooves in the first rotatable member is con-nected to a vacuum source.
CA000360988A 1980-09-24 1980-09-24 Machine for wrapping elongated articles in plastic film Expired CA1155046A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA000360988A CA1155046A (en) 1980-09-24 1980-09-24 Machine for wrapping elongated articles in plastic film

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA000360988A CA1155046A (en) 1980-09-24 1980-09-24 Machine for wrapping elongated articles in plastic film

Publications (1)

Publication Number Publication Date
CA1155046A true CA1155046A (en) 1983-10-11

Family

ID=4117982

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000360988A Expired CA1155046A (en) 1980-09-24 1980-09-24 Machine for wrapping elongated articles in plastic film

Country Status (1)

Country Link
CA (1) CA1155046A (en)

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