JPH0811841A - Method for packing and packed product - Google Patents

Abstract

PURPOSE:To provide a method for packing in the practice of which no crease or wrinkle is formed on the surface of the pack even in the case where individual products packed in a tube of heat-shrinkable resin are ranged in parallel and all of the surfaces of the pack are not plane and to provide a product packed according to this method. CONSTITUTION:A series of products (dry cells 2) ranged in parallel in a row are inserted in a tube 3 of heat-shrinkable resin and fed continuously on a conveyor belt 4. By the use of a pair of air nozzles 7 release agent from respective release agent-feeding devices 6 is blown together with air into the tube, that is, between the resin tube 3 and the dry cells 2. After that, the resin tube 3 is heated for shrinking in a heating furnace 5 to complete the packing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a packaged product for packaging a product having a relatively small size such as a battery with a resin film which shrinks when heated.

[0002]

2. Description of the Related Art A conventional method of wrapping a product with a resin film that shrinks by heating is to arrange a product to be packaged such as a battery inserted in a resin tube that shrinks by heating on a conveyor belt, and store the product in the resin tube. The resin tube was sent into the heating furnace set to the optimum shrinking temperature as shown in FIG. 2 to shrink the resin tube by heating. The heating furnace has a structure in which a blower device 1 and a heater are disposed in the central portion of the heating device to circulate hot air, and the hot air blown by the blower device 1 and the heater is supplied from a side portion inside the heating furnace with a resin tube. The resin tube was uniformly sprayed onto the side surface of the product to be packaged such as the battery inserted in the, and the resin tube was rapidly shrunk by heating in the first half of the heating furnace.

[0003]

However, according to this conventional method, when the product to be packaged such as a battery is inserted into the resin tube, the portion of the resin tube which comes into contact with the side surface of the product to be packaged such as the battery is exposed. Blocking is present as indicated by the diagonal lines in 3 (b). Originally, it is preferable that the resin tube is uniformly heated and shrunk in each part as shown by the arrow in FIG. 3A. However, if there is blocking at the part of the resin tube that contacts the product, as shown in FIG. 3B. Since the resin tube and the side surface of the packaged product such as a battery are poorly slid, the resin tube has different contraction states in the central direction and the outward direction from the contact portion with the product, resulting in an inhomogeneous contraction state. As a result, wrinkles are generated due to the heat-shrinked resin tube itself. This wrinkle significantly impairs the appearance quality of the product. In addition, when a packaged product packaged with a heat-shrinkable resin tube is set in an automatic vending machine, the wrinkles of the packaging resin film may cause slippage between packaged products to be difficult to carry out outside the automatic vending machine. there were.

[0004]

In order to solve the above-mentioned problems, the invention according to claim 1 is provided with a plurality of products arranged in parallel in a row and a resin tube that wraps these products and shrinks by heating. A plurality of products in the one row state are inserted into the resin tube, and a mold release agent having a function of preventing adhesion between the resin and the product is blown together with air between the resin tube and the product side surface, and the resin tube Is sent to a heating furnace in a state where most of the resin tube is separated from the product to heat-shrink the resin tube.

The invention according to claim 5 is provided with a plurality of products arranged in parallel in a row and a resin tube that wraps these products and shrinks by heating, and a mold release is provided between the product and the resin tube. It is a packaged product in which the agent is present in a regular package.

[0006]

By injecting the release agent between the resin tube which shrinks by heating and the product, the resin tube and the product can be gently heated and shrunk in the heating furnace without blocking.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In this embodiment, two shrink packs of a single type B battery are taken as a product to be packaged. In FIG. 1, reference numeral 2 is a set of two C-type batteries, and the batteries 2 are arranged in parallel in a line. Reference numeral 3 is a resin tube that wraps the battery 2 and shrinks when heated. The battery 2 inserted in the resin tube 3 (hereinafter, this is counted as one pack) is continuously supplied to the conveyor belt 4 (for example, the conveying speed is 0.6 m / sec) at a rate of 350 packs per minute. , Hot air circulation tunnel type heating furnace 5 (total length 1, 4
00 mm). The release agent feeding device 6 is provided corresponding to each of the two air nozzles 7 and is composed of a release agent storage container 8 and a vibrating device 9. The tip of the air is fed from the conveyor belt 4 at the entrance of the heating furnace 5 to the entire battery. It is located at the center of the height, and is installed on both sides of each 20 mm from the center of the lateral width of the conveyor belt 4 (the battery radius is about 18 mm). As for the release agent, a powdery release agent, for example, fine powdery starch is lifted by the release agent feeding device 6 and is conveyed together with the air to the conveyor belt 4.
Is blown in the same direction as the moving direction of at a pressure of 1.5 to 2.0 kgf / cm ² . When the battery 2 inserted in the resin tube 3 passes the tip end installation position of the air nozzle 7 by the conveyor belt 4, the side surface of the battery 2 and the resin tube 3 pass from the air nozzle 7 through the opening of the resin tube 3. Blasting a starch as a powdery mold release agent between them and shrinking the resin tube 3 in the heating furnace 5 (the temperature inside the furnace is 150 ± 10 ° C.) while maintaining this state, two batteries are arranged in parallel. In spite of this, there is no blocking between the side surface of the battery 2 and the resin tube 3, and the shrinkage state is uniform, and the packaging resin film is a product provided with a shrink pack that is uniform without wrinkles. The reason for this is that the powdery mold release agent is blown together with air between the side portion of the battery 2 and the resin tube 3, and the powdery mold release agent adheres to the contact portion between the battery 2 and the resin tube 3 to cause the battery 2 Side and resin tube 3
This is because the resin tube 3 is gradually heat-shrunk without blocking with the above. After the packaging process, the state of attachment of labels etc. to the side of the battery is more stable than before, and there is a problem that the shrink pack gets caught at the connection part of the conveyor belt and the feeding chute due to wrinkles in the post-boxing process. Few. Furthermore, when the shrink pack was set in the vending machine, the slippery slippage between the shrink packs caused by wrinkles and the trouble that it was not carried out outside the vending machine was drastically reduced.

In this embodiment, the starch is used as the mold releasing agent, but the same effect as that of the starch can be obtained by using talc or a fluororesin material as the other mold releasing agent.

[0009]

As is apparent from the above description, in the packaging method of the present invention, a mold release agent is blown between the side surface of the product and the resin tube in the heating furnace in the step of heat-shrinking the resin tube in which the product is inserted. Since the heat shrinks gently, the shrinkage state becomes more uniform than before, and the wrapped resin film can be packaged without wrinkles. And since there are no wrinkles, the product appearance quality is improved.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of a packaging device showing an embodiment of the present invention.

FIG. 2 is a perspective view of a hot air circulation type tunnel heating furnace.

FIG. 3 (a) is an explanatory view showing the contraction direction of the resin tube when there is no contact portion with the battery, and (b) is an explanatory view showing the contraction direction of the resin tube when there is a contact portion with the battery.

[Explanation of symbols]

 1 Blower device 2 Battery 3 Resin tube that shrinks by heating 4 Conveyor belt 5 Heating furnace 6 Release agent feeding device 7 Air nozzle 8 Release agent storage container 9 Vibration device

Claims (5)

[Claims] 1. A plurality of products arranged in parallel in a row and a resin tube that wraps these products and shrinks by heating, wherein the plurality of products in the one row state are inserted into the resin tube and A mold release agent having the function of preventing the resin and product from adhering to the side surface of the product is blown together with air, and most of the resin tube is sent to a heating furnace in a state of being separated from the product to heat the resin tube. Shrinkable packaging method. 2. An air nozzle is arranged at the inlet of the heating furnace,
The packaging method according to claim 1, wherein a mold release agent having a function of preventing adhesion between the resin and the product is blown together with air between the resin tube and the side surface of the product from the opening portion of the resin tube by the air nozzle. 3. A packaging method in which the product in the packaging method according to claim 1 is a battery. 4. The packaging method according to claim 1, wherein the mold release agent is corn starch, talc, or a fluororesin material. 5. A product comprising a plurality of products arranged in parallel in a row and a resin tube that wraps these products and shrinks by heating, and a mold release agent is present between the products and the resin tube. Packaged packaged product.