JPH0699919A - Air-permeable packaging material and packaging device - Google Patents

Abstract

PURPOSE:To perform an air-permeable packaging with a stretch-wrap film, which is resemble a net-wrap packaging. CONSTITUTION:Slits S having a specified length are perforated in a stretch-wrap film in the course of packaging to obtain a film FS with slits. The film FS is immediately stretched crosswise to a width W2 by a tentering roller 4. As a result, the slits S are turned to vent holes T, and in this state, the film is wound around the surface of an item to be packaged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a package using a stretch film, which retains air permeability in the package and is stable against load collapse and a packaging apparatus.

[0002]

2. Description of the Related Art Stretch film packaging is performed for the purpose of preventing collapse of accumulated luggage, but the conventional method is not suitable for packaging that requires air permeability of fruits and the like because it is in a sealed state and air permeability Net packaging is used for packaging.
The net is much more expensive than the stretch film, and the work is troublesome and time-consuming because it is necessary to fix the first end and the end of the pallet packaging with adhesive tape or the like. In order to solve this problem, the present inventor first divided the film in parallel in the longitudinal direction in the process of winding the film around the load on the horizontal rotary table for the purpose of imparting air permeability to the film packaging of the load. Then, a ventilation packaging method has been proposed in which a tension between winding films is used to cause an obstacle between the divided film tapes to automatically form a mesh-shaped ventilation portion on the packaging surface (Japanese Patent Laid-Open No. Hei 10 (1999) -242242).
However, the effect of preventing load collapse was not sufficient because the packaging material was divided into tapes.

[0003]

DISCLOSURE OF THE INVENTION The present invention is similar to a net wrap that is resistant to load collapse by forming slits in the stretch film during the packaging process and expanding the slits in the width direction to form slits as ventilation holes. It provides a package. Further, the present invention provides a packaging device in which the number of slits, length, slit pitch, etc. can be easily changed.

[0004]

According to the present invention, slits having a predetermined length are arranged or scattered at predetermined intervals in a longitudinal direction of a film to be wrapped around an object to be packaged, and the film is expanded in the width direction to be covered. It is intended to obtain a breathable package in which a large number of ventilation holes are formed by being wrapped around the package.

In the stretch film packaging apparatus, the apparatus of the present invention supports at least one passing film on the upstream side of the film of the rotary table on which the article to be packaged is placed, and can swing to a slit position within a predetermined angle range. A swinging roller, a rotary slitter equipped with a plurality of knife groups that can be temporarily stopped at the slit position, and a widening in which a slitted film formed by the slitter is stretched in the width direction so that the slit serves as a ventilation hole. And means.

[0006]

EXAMPLE A film F from a film roll passes through fixed guide rollers 1, 2, 3 and is passed through a tenter curving roller 4 and a tension roller 5 to be wound around an article B to be packaged on a turntable. Reference numeral 10 denotes a rotary slitter provided between the fixed guide rollers 2 and 3, and includes a knife group C1 and C2 axially symmetrical to the rotary shaft cylinder 11. In each knife group, a plurality of knives 12 are axially mounted at a predetermined interval G. The slits S can be arranged in a zigzag manner by setting the number of knives in each knife group to N and N + 1. A rotary shaft 13 penetrates the rotary shaft cylinder 11 and is connected to the rotary shaft cylinder via a one-way rotation clutch 14. Reference numeral 15 is a rotating shaft bearing, and 16 is a forward / reverse variable speed geared motor. Reference numeral 18 denotes a rotating gear, which is a pinion 1 axially attached to the rotary shaft 13.
7, and a swing arm 20 is pivotally mounted via a gear shaft 19.

Reference numeral 21 is a swinging roller rotatably provided at the tip of the swinging arm 20. Reference numeral 22 is a sprocket axially attached to the gear shaft 19, and is connected by a chain 24 to a sprocket 23 paired in the downstream direction of the film.
The sprocket 23 has a swing arm 25 having a swing roller 26.
Is stuck. The swing arms 20 and 25 operate in synchronization,
As shown in FIG. 3, the film is moved to the slit position SP and pressed against the knife 12 of the slitter to form a slit. The gear ratio between the pinion 17 and the rotating gear 18 is 1: 2, and the swinging arms 20 and 25 are set to R and Q in the figure by the forward and reverse rotation of the motor 16.
During the return movement from Q to R, the rotary slitter 10 rotates 180 ° in the direction of arrow D to alternate the knife group at the slit position SP with another knife group.
It should be noted that the knife rotating shaft cylinder 11 does not rotate due to the action of the one-way clutch while the swing arms 20 and 25 are rotating in the direction from R to Q.

The slit forming process in the above apparatus is as shown in FIGS. 1, 3 and 4. That is, in FIG. 1, the film F is pushed and moved as shown in FIG. 3 while the swing rollers 21 and 26 rotate from the R position to the Q position. The rotary slitter 10 is prevented from rotating by a one-way clutch. The slits S corresponding to the number of knives are formed in the film by the knife group C1 of the slitter stopped at the slit position SP. The motor 16 rotates in the reverse direction and the swing rollers 21 and 2
In the process of returning 6 as shown in FIG. 4, the rotary shaft cylinder 11, that is, the rotary slitter 10 is rotated by 180 °, and the knife group C2 is positioned at the slit position SP to insert the next slit. Thus, the film with slit FS as shown in FIG.
Is created. The slit interval G is the axial interval of the knife 12, and the length L and the pitch P of the slit S can be varied depending on the film transfer amount and the motor rotation speed.

The roll-out curving roller 4 has a coil spring whose surface is covered with urethane and is inserted into the curving fixed shaft 30. The curving roller 4 is only in contact with the film by the tension of the rotating table. The width W1 of the film is expanded in the width direction W2 by the action of the rotation and the curved surface. As a result, each slit S formed in the film FS is expanded as shown in FIG. 6 to form a vent hole T, which is wound around the object to be packaged in this state.

[0010]

As described above, the present invention makes it possible to obtain the same breathable wrapping form as net wrapping by using the stretch film and the wrapping device for the stretch film, and can be applied to bulk loads without fear of collapse of loads.

[Brief description of drawings]

FIG. 1 is a plan view of an essential part of the device.

FIG. 2 is a side view of the main part in the direction of arrow A in FIG.

FIG. 3 is a diagram showing a relationship between an operation of a swing roller and a rotary slitter.

FIG. 4 is a diagram showing a relationship between an operation of a swing roller and a rotary slitter.

FIG. 5 is a plan view of a slit film.

FIG. 6 is a plan view of a perforated film that has been tented out.

[Explanation of symbols]

 4 Curving Roller for Width 10 Rotating Slitter 11 Rotating Shaft Tube 12 Knife 13 Rotating Shaft 14 One-way Clutch 16 Forward / Reverse Motor 17 Pinion 18 Rotating Gear 21 Swinging Roller

Claims (2)

[Claims] 1. The packaging film has slits arranged or scattered in the longitudinal direction of the film at a predetermined interval, and the slits are spread as a width direction and wound around an object to be packaged so that the slits serve as ventilation holes. Breathable packaging formed. 2. In a stretch film packaging apparatus, at least one rocking roller that supports a passing film on a film upstream side of a rotary table on which a material to be packaged is mounted and can rock to a slit position within a predetermined angle range. A rotary slitter having a plurality of knife groups that can be temporarily stopped at the slit position, and a widening means that spreads a slitted film formed by the slitter in the width direction to form the slit as a ventilation hole. Breathable packaging equipment.