JPH0217411B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a shrink pretreatment device, in which a cylindrical film for shrinking which is slightly taller than the bottomed container is fitted into a bottomed container, and the film is placed in a shrinking furnace. Before heat shrinking the cylindrical film for shrink-linking, a preliminary shrinking process is carried out by blowing hot air onto the lower side of the film to prevent it from floating up, so that a portion of the film sticks tightly to the container. The film is subjected to a pre-shrinking treatment in which the upper edge of the film, which projects upwardly from the container, is brought into close contact with the bottom surface of the container in a shrink oven.

(Prior art and issues to be solved) A cylindrical film for shrinking which is slightly taller than the container is fitted into an upside down container with a bottom, and is passed through a shrinking furnace to undergo heat shrinkage treatment to form a cylindrical film for shrinking. Techniques for tightly adhering a film to the periphery of a container are well known, but there is no technique for thermally bonding the lower outer periphery and upper end of the cylindrical film to a bottomed container before passing it through a shrink furnace, and then passing it through the furnace to heat it. unknown.
However, in a Shrink furnace, the lower edge of a cylindrical film fitted into a bottomed container such as a pot-shaped container that is upside down may shrink below the mouth of the bottomed container and stick to the opening, or the upper edge may It is impossible to completely eliminate the failure of the heat shrinking process, in which curling-like shrinkage occurs independently above the bottom and the container does not adhere to the bottom of the container in a thin film form.

An object of the present invention is to provide an apparatus for rationally thermally adhering a bottomed container that is turned upside down before being passed through the Shrink furnace and a cylindrical film for Shrink fitted therein before heating the entire thing in the Shrink furnace. It is something to do.

(Means for Solving the Problems) The present invention provides a conveying device for fitting a cylindrical film for shrinking with a height slightly higher than the container into a lowered bottomed container and transferring the film to a shrinking furnace, The cylindrical cylindrical film for sylink is driven in contact with the upper edge of the cylindrical cylindrical film for syurinc, and is transferred by the lifting prevention device and the conveying device, and the cylindrical film for syurinc is prevented from floating by the anti-lifting device. A hot air blowing nozzle is installed corresponding to the lower side of the container passing through, and the upper end is connected to the above-mentioned floating prevention device to blow hot air from above onto the upper end of the cylindrical film for shrinking in front of the furnace. The present invention relates to a shrink pretreatment device characterized by comprising a hot air injection tube for pre-shrinking, and which can improve the efficiency of heating a bottomed container in a shrink furnace by turning it upside down and fitting a cylindrical film for shrink. .

(Example and its operation) FIG. 1 is a schematic plan view of the Shrink device, in which the collar b is attached to the intermittent drive conveyor belt 2 running on the belt guide of the machine frame 1 as shown in FIG. The cup-shaped bottomed containers a are sequentially fed one by one from the container feeding device 3 in a prone manner, and the containers a are stopped below the film supply section 4, and the lower edge e is placed above the flange b of the containers a. The cylindrical film d for shrinking is loosely fitted so that it is locked, and then sent to the pretreatment device of the present invention. The upper edge f of the film d is slightly higher than the height of the container a.

is a shrink furnace installed following the pretreatment equipment.

At the lower part of the turret-shaped frame 11 of the pre-processing device, there is a transport belt 12 that is at the same height as the transport belt 2.
The driving roller 16 and the driven roller 16 support the respective shafts 13a and 14a of the drive roller 13 and the driven roller 14, which span the shafts of the drive roller 13 and the driven roller 14. Each shaft 16a, 17a of the roller 17 is supported. A chain 22 is stretched between sprockets 20 and 21 fixed to shafts 13a and 16a of drive rollers 13 and 16, and sprocket 19 of drive shaft 18.

The transport belt 12 and the presser belt 15 are driven at the same speed, which is matched to the speed of the transport belt 2.
As shown in FIGS. 2 and 3, the transfer belt 12 and the presser belt 15 are each a pair of timing belts with the rough engaging surfaces facing up.

The presser belt 15 described above constitutes an example of the lifting prevention device of the present invention. Inside the frame 11 is a transfer belt 12, as clearly shown in FIG.
A pair of nozzle bodies 23, 23a are attached to a support plate 24 and are installed to inject hot air from both sides onto the jaw b of a container a to be transferred on a hot air injection cylinder 25 which blows hot air to the upper side of the outlet of the frame 11. Install.

The container a tends to float up the shrinkable cylindrical film d, which has only been loosely fitted, due to the vibration of the conveyor belt 2 or the like. In this embodiment, when the container a is fed from the conveyor belt 2 to the transfer belt 12, the upper edge of the shrink cylindrical film d is pressed down by the presser belt 15 to prevent it from floating up, and the film passes between the nozzle bodies 23 and 23a. While passing through, it is thermally contracted by the hot air ejected from the nozzle body and joined to the portion directly above the collar b of the container a, as shown in FIG. (Typically, the inner surface of the cylindrical film b for shrinking is coated with a thin layer of heat-soluble adhesive, so thermal adhesion is involved in most cases.) In this way, the container a comes out of the frame 11. When moving onto the bar conveyor 30 running at the bottom of the Shrink furnace, the upper surface is gently exposed to hot air blown from the hot air jet tube 25, so that the upper edge f of the Shrink cylindrical film d is centered as shown in FIG. There will be a slight amount of heat shrinkage that will curl in the direction.

As shown in FIG. 5, the container a in which a part of the cylindrical film d for shrinking has been heat-shrinked does not move the film d upward while passing through the shrinking furnace, and the film d does not move outside the furnace. , the upper edge f does not undergo heat shrinkage alone into a ball-like shape in a furnace or the like, and heat shrinkage is caused to bring the film d into close contact with the peripheral surface and part of the bottom surface of the container a without causing wrinkles.

(Effects) As clarified from the above description, the present invention provides a shrinkable cylindrical film that is tightly attached to the entire circumference and a part of the bottom of the bottomed container a by heat shrinkage. In a conventional shrinking device that produces a decorative effect similar to pasting a reticle, the lower edge e of the film d is tightly attached only to the lower outer periphery of the opening of the container a, before the shrinking process in the shrinking furnace. and the pretreatment of the film d.
Point the upper edge f of the container toward the bottom c of the container a,
This device is a device that continuously performs a slight bending process by heat shrinkage, and this pretreatment prevents the film d from lifting from the intended bonding area or causing partial wrinkles, and also prevents the upper end f from being rolled up. It is possible to perform a heat treatment in which the entire body is bonded to the container a in a tensioned state in the shrink furnace without being separated from the bottom surface c of the container a, and the shrink-linking can be performed without pre-treatment using such a pre-treatment device. Compared to conventional heat treatment that involves passing it through a furnace, it has the effect of significantly improving the shrink finish.

[Brief explanation of drawings]

The attached drawings show one embodiment of the present invention, in which Fig. 1 is a schematic plan view, Fig. 2 is a side view of the main part, Fig. 3 is a partially cutaway front view of the same, and Figs. 4 and 5 are preliminary drawings. FIG. 3 is a perspective view of container a illustrating shrinkage. 2 → Conveyor belt, → Pretreatment device, → Shrink furnace, 11 → Frame, 12 → Transfer belt, 1
5 → Presser belt (levitation prevention device), 23, 23
a → nozzle body, 25 → hot air injection tube.

Claims (1)

[Claims] 1. A transport device that fits a cylindrical film for shrinking which is slightly higher than the container into a recessed bottomed container and transfers the film to a shrinking furnace, and a cylindrical film for shrinking that is fitted into the bottomed container above the transporting device. A device for preventing floating of the cylindrical film for shrinking, such as a belt driven in contact with the upper edge, and a device for preventing floating of the cylindrical film for shrinking, which is transported by a conveying device and is prevented from floating by the floating prevention device. A hot air blowing nozzle body installed corresponding to the lower side of the container, and an upper end that is connected to the anti-floating device and blows hot air from above onto the upper end of the cylindrical film for shrinking in front of the furnace. 1. A shrink pretreatment device characterized by comprising a warm air injection cylinder for preliminary shrinkage.