JPH0618204U - Stretch wrapping equipment - Google Patents

Abstract

(57) [Summary] (Correction) [Structure] A roll film 12 rotatably supported by two rolls 10 and 11 is drawn out in a strip shape by an expander roll 15 installed so that its axis is curved. On the upper surface of the article 20 to be conveyed in the direction of the arrow, and the V-shaped squeezing belt 21,
At 21, the film is made into a palm-like shape and the film is made into a tubular shape. At the same time, both side edges of the film, which is formed like a palm-like shape, are welded together by a pair of center seal rolls and then sealed with a sealer. [Effect] The film is stretched in the width direction due to the rotational friction of the expander roll whose axis is curved, and the two side edges of the film are sandwiched by a large number of conventional clamps provided in a pair of endless chains, and the film is rotated by the chain. The structure is simpler than that of transporting by stretching it horizontally, and the film can be stretched as a whole for packaging.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a device for stretching a strip-shaped film having a stretching property in the width direction and winding it in a tubular shape around an object to be packaged, and wrapping the object to be packaged in a tension state with the film.

[0002]

[Prior art]

 Since a film having stretching characteristics is thin and flexible and has a large friction coefficient, it is not possible to make the film into a tubular shape by using a tubular former that causes the film to stick. , The clamps 2, 2 provided on a pair of chains 1, 1 supported by a plurality of foils clamp both side edges of the film 3, and the chain 3 rotates to transfer the film 3 at the same speed as the object to be packaged 4. Meanwhile, the object to be packaged is wrapped with the film. The pair of clamps 2 and 2 stretches the film 3 in the width direction when the clamps 2 and 2 are separated from each other toward the foils 5 and 5, and then the foils 6 and 6 are moved under the object to be packaged 4, so that the film is removed. The object to be packaged is packaged in a tubular shape.

[0003]

[Issues to be solved by the device]

 However, the wrapping machine stretches the both sides sandwiched by the clamps 2 to an extreme extent as compared with the middle of the film, which makes the both sides of the film thin, and the cost of the wrapping machine tends to increase due to the use of chain. was there. Therefore, an object of the present invention is to provide a packaging machine that does not use chain and does not partially stretch the film.

[0004]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides means 10 and 11 for rotatably supporting a roll film, and an axial curved line installed on the downstream side of the film of the means to provide the friction by the circumferential surface during rotation. An expander roll 15 for pulling out the roll film in a strip shape, and a pair of pressing rolls 19 provided so as to press both side edges of the film to be covered by an object to be packaged conveyed horizontally in a downstream side of the expander roll. 19, a pair of film squeezing belts 21 and 21 for sandwiching both side edges of the strip-shaped film on the lower side of the film of the press roll under the object to be packaged in a palm shape and a pair of both side edges of the palm-shaped film welded together. The center sealers 23, 23 and a means 24 for cross-sealing the tubular film between the respective articles to be packaged.

[0095]

[Action]

 The roll film 12 is drawn out in a strip shape by the rotational friction of the expander roll 15. However, since the expander roll 15 has a curved axis line, the film has a rotational friction on the peripheral surface of the expander roll. When receiving, it is stretched in the width direction along the axis of the roll and placed on the article to be packaged. The pair of presser rolls 19 and 19 on both sides of the article to be wrapped move the film downward, and the pair of film squeezing belts 21 and 21 overlap the edges of both sides of the film so that the film is tensioned around the article to be packaged. Then, the film is sealed by the center sealers 23, 23 and the cross sealer means 24.

[0006]

【Example】

 In FIG. 1A, two rollers 10 and 11 rotatably provided on the machine base are film supporting means on which a roll film 12 is rotatably mounted, and the pair of rollers 13 and 14 are the above-mentioned rollers. It has a function to pull out the film in a strip shape. The expander roll 15 provided on the downstream side of the film has its axis set in a curved shape, and imparts a force to further pull out the film 12 by the rotational friction of the peripheral surface. The rear pair of rolls 16 and 16 have a function of pulling both side edges of the film further outward by the rotational friction. The rear pair of upper and lower conveying rolls 17 and 18 sandwich and transport the film, and the angular holding rolls 19 and 19 at the rear of the transport rolls 17 and 18 press both side edges of the film downward to press the film on the package 20. . The pair of squeezing belts 21 and 21 installed in a V shape at the rear side are arranged so that both side edges 22 and 22 of the film are overlapped with each other in the shape of a palm under the object to be packaged 20. The two side edges of the film are continuously welded, and the rear cross seal device 24 seals the tubular film between the objects to be packaged.

Instead of the expander roll described above, it is possible to use a roll 30 having two symmetrical spiral grooves 31, 31 formed on the circumferential surface as shown in FIG. When the roll 30 pulls the film 32 due to its rotational friction, the spiral groove 31, 31 on the circumferential surface causes the film 30 to be stretched in the width direction 33, 33.

[0008]

【effect】

 The present invention provides a roll for drawing and feeding the film to the tube making mechanism in the form of a strip. In the device of claim 1, a curved expander roll 15 is provided, while in the device of claim 2, a spiral groove that widens toward the peripheral surface. Since the rolls are formed by the rolls 30, the films are automatically spread in the width direction by the rolls while being drawn out. Therefore, it is necessary to provide a pair of chains for stretching the film as in the conventional case. Therefore, the structure is simple, and the whole film can be stretched and wrapped as compared with the one pulled by a chain.

[Brief description of drawings]

FIG. 1A: Side view of the present invention

FIG. 1B is a plan view of the previous figure.

FIG. 2 is a diagram of another embodiment of the expanding roll.

FIG. 3 is an explanatory diagram of a conventional example.

[Explanation of symbols]

10, 11 ... Film support means 12 ... Roll film 15 ... Expander roll 19 ... Press roll 21 ...
Drawing belt 23 ... Center seal roll 24 ... Cross seal roll 30 ... Expansion roll 31 ... Spiral means

Claims (2)

[Scope of utility model registration request] 1. An extract for rotatably supporting a roll film, and an extract which pulls out the roll film in a belt-like shape by axially installing a curved line on the downstream side of the film of the means and by friction of the peripheral surface during the rotation. Panda roll 15,
A pair of presser rolls 19 and 19 provided to press both side edges of the film to be covered by a package conveyed horizontally in the film downstream of the expander roll, and a belt-like band on the film downstream side of the presser roll. A pair of film squeezing belts that sandwich both edges of the film under the object to be packaged in a palm shape.
1, 21 and a pair of center sealers 23, 23 for welding both side edges of the palm-shaped film, and a means 24 for cross-sealing the tubular film between the objects to be packaged. 2. Means 10, 11 for rotatably supporting a roll film, and a film expanding roll 30 provided with symmetrical spiral means 31, 31 diverging toward the peripheral surface on the film downstream side of said means. A pair of pressing rolls 1 provided so as to press both side edges of the film to be covered by an object to be packaged which is horizontally conveyed on the downstream side of the film of the film expanding roll.
9, 19 and a pair of film squeezing belts 21 and 21 for sandwiching both side edges of the strip-shaped film on the downstream side of the film of the press roll in a palmar shape below the object to be packaged and a pair of welded side edges of the palm-shaped film. Means 2 for cross-sealing the tubular film between the center sealers 23, 23 of FIG.
Stretch wrapping device composed of 4 and.