JPS6137603Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention moves a stretchable strip-shaped film in its longitudinal direction, and places the film in a cylindrical shape around an object to be packaged that moves along the film. This invention relates to a film cylinder making mechanism for wrapping and packaging film.

(Prior Art) In supermarkets, products are sold in which trays containing sliced meat, fish sashimi, etc. are wrapped in a breathable film. This type of film, which is breathable to maintain the freshness of the packaged items, is thin, highly stretchable, has a "moist" feel, and has a high coefficient of friction, so it is made into a cylinder. In some cases, it is not possible to use a cylindrical mold like a general bag-forming and packaging machine. Therefore, conventionally, as shown in FIGS. 3 and 4, both side edges 22, 22 of a film 21 placed over a tray 20 are guided between a pair of belts 23, 23 on both sides, and the rotation of both belts 23, 23 is prevented. The film 21 wound around the tray 20 is then stretched. When the film is stretched, countless ventilation holes are formed, but the film in this state is extremely susceptible to friction. That is, even in the cylinder making mechanism shown in FIGS. 3 and 4, at least the lower surface of the tray 20 is connected to the guide plate 24 of the belts 23,
Since friction is inevitable against the upper surface of the tray 24, scratches are formed on the film by the guide plates 24, 24 on the lower surface of the tray, especially at the corners of the lower surface, and the film is likely to tear during the product distribution process. ,
Therefore, there is a limit to the ability to reduce costs by using thinner films.

(Problems to be solved by the invention, etc.) In view of the above points, the present invention includes a film that covers the bottom surface of a tray or an object to be packaged, and a guide plate for a belt that tightens both sides of the film in a pinch-like manner. This reduces friction and allows the use of thinner films beyond the conventional limits.

(Means for Solving the Problem) In order to achieve the above object, the present invention moves a stretchable strip-shaped film in its longitudinal direction, and moves the film around the packaged object moving along the film. This relates to a cylinder forming mechanism of a packaging machine that winds a film into a cylinder shape and seals the packaged object with the film, the film comprising a pair of guide plates on both sides across the center line of the trajectory along which the film moves. 1,
At the same time, endless belts 6, 6 are arranged around both guide plates, and both belts are tensioned by at least two pulleys 4, 5, 4, 5, respectively, and the above-mentioned While the belts 6, 6 are placed along the V-shaped inclined edges 2, 2 inside the tips of the guide plates and the mutually opposing surfaces of the guide plates that are continuous with the inclined edges, the pulleys 5, 5
is connected to a drive mechanism so that the belts 6, 6 on both sides grip and rotate the film, and furthermore, the contact surfaces of the film on both guide plates 1, 1 are subjected to a raising treatment consisting of countless raised raised pieces 10, 10... When the tray passes over the guide plate of the belt, the brushed top surface of the guide plate comes into soft contact with the bottom surface of the tray to prevent scratches on the film. .

(Example) Embodiments of the present invention will be described below based on the drawings.

In Figure 1, both edges of a strip-shaped film F are guided between a pair of left and right guide plates 1, 1, and the edges F ₁ and F ₁ of the film are overlapped in the shape of palms together, and the film is wrapped around an object to be packaged A. The diagram shows the state in which F is made into a tube from the bottom. Both guide plates 1, 1 have symmetrical inclined edges 2, 2 formed inside their tips, and these inclined edges 2, 2 form a V-shaped guide portion 3 between the two guide plates. It consists of Further, both the guide plates 1, 1 have small pulleys 4, 4 arranged at their outer tips, and large pulleys 5, 5 arranged at their rear ends. The endless belts 6, 6 stretched between the two guide plates 1, 1
along the opposite edges of each. In FIG. 1, reference numerals 7 and 7 designate a pair of heat rollers for welding the overlapping portions of both side edges of the film. In addition, as shown in Fig. 2, the upper surfaces of both guide plates 1 and 1 have raised
0.10 is applied. The raised portion 10 may be made by pasting a woven fabric such as carpet or a non-woven fabric such as felt with the raised portion facing upward on the upper surface of the guide plates 1, 1, or by applying electrostatic flocking directly to the guide plate 1. Consisting of:

Therefore, when the pair of left and right driving pulleys 5, 5 are rotated in symmetrical directions in FIG.
The belts 6,6 rotate along opposite edges of the guide plates 1,1. Then, when the opposite edges F ₁ and F ₁ of the film F are sandwiched between the belts 6 and 6, the film F is pulled in the direction of arrow B by the rotational force of the belts 6 and 6, and is fed one after another. A tube is formed around the packaged object A. In the above case, the film F is tightened by the V-shaped guide portion 3 and wrapped around the packaged item A in a tight state, but the film is positioned below the bottom surface of the packaged item A as shown in Figure 2. The film F is run while being in contact with the nap 10.

(Effects) As described above, the present invention can produce a strip-shaped film by rotating a pair of endless belts 6, 6, which are stretched around both guide plates 1, 1 and along the inclined edges 2, 2. In a film in which the film is formed into a tube around the object to be packaged A by guiding both side edges F ₁ and F ₁ of F between the guide plates 1 and 1, there are provided on the upper surfaces of the guide plates 1 and 1, respectively. It has a brushed surface of 10 and 10. Originally, the weight of the packaged item A is directly applied to the upper surface of the guide plates 1, 1, and the film F causes friction between it and the guide plates 1, 1 in proportion to the weight of the packaged item A. However, while there was no problem with relatively thick films (although they are not that thick), when using extremely thin films, there were countless scratches caused by the friction mentioned above. A tear may occur in some parts. That is, the inclined lines 2, 2 of the guide plates 1, 1 gradually reduce the diameter of the cylindrical film around the object A, so that the lower surface of the film A is smaller than other parts of the film. As a result of being forcibly stretched, the film is torn due to factors that combine with the scratches mentioned above, and even if the film does not tear during packaging, the packaging may be torn during the distribution process, such as in the market. However, since the nap 10 comes into soft contact with the film and does not scratch the film, it is possible to prevent the film from being damaged, especially in this kind of tube-making mechanism for film tension packaging. Therefore, there is an effect that it is possible to use a thin film and help reduce packaging costs.

[Brief explanation of drawings]

Fig. 1 is a bottom view showing an embodiment of the present invention, Fig. 2 is a front view taken from the front, Fig. 3 is a plan view for explaining the conventional example, and Fig. 4 is an enlarged front sectional view of the previous figure. It is. 1... Guide plate, 3... Guide section, 6... Belt,
10... nap, A... packaged object, F... film.

Claims (1)

[Scope of utility model registration request] Packaging in which a stretchable strip-shaped film is moved in its longitudinal direction, the film is wrapped in a cylindrical shape around an object to be packaged that moves along the film, and the object to be packaged is sealed with the film. This relates to the cylinder making mechanism of the machine, in which a pair of guide plates 1, 1 are installed on both sides across the center line of the trajectory along which the film moves, and an endless belt 6 is installed around each of these guide plates. , 6 are arranged, and both belts are tensioned by at least two pulleys 4, 5, 4, 5, respectively,
While driving the pulleys 5, 5 while driving the belts 6, 6 along the V-shaped inclined edges 2, 2 inside the tips of the guide plates and the mutually opposing surfaces of the guide plate that are continuous with the inclined edges. Belts 6 on both sides connected to the mechanism,
The cylinder making mechanism of the packaging machine is constructed by rotating the film by holding the film therebetween, and further applying a raising treatment consisting of numerous raised raised parts 10, 10, . . . to the contact surfaces of the film on both guide plates 1, 1.