JPS6181930A - Method and device for detecting defective sealed package - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for inspecting the sealing properties of sealed bags and making it possible to exclude defective products.

Since the sealability of a bag greatly affects the storage stability of the contents of the bag, such as oxidation, moisture absorption, and putrefaction of the contents, inspection of the sealability and identification and elimination of defective products are important issues in the industry.

The present invention provides a means for solving the above-mentioned problems.Generally, when a sealed body is pressed, if the sealing performance is good, the pressing device receives a repulsive force from the bag, but if the seal is not properly sealed or the bag is not properly sealed. This is based on the simple principle that if there is a pinhole in the material of the bag, the air inside the bag will leak out to the outside, so the repulsive force will not be too large. In other words, a hollow body is placed between the bag and the pressurizing device, and the volume change that occurs as a buffer against oppression from above and below is detected as a pressure change, and when this pressure change is small, it is identified as a sealed product. It is something to do.

The invention will now be described in detail with reference to the accompanying drawings. “The object to be processed/packaged body 1 in the present invention is made of ordinary materials,
For example, the bag is made of cellophane, paper, synthetic resin, or a combination of these materials and aluminum M, and air is sealed inside the bag along with the contents, and the bag is inflated and sealed. It is also necessary that the material has enough strength that it will not easily burst even if it is pressed to some extent. There are no particular restrictions on the sealing means, and heatnol is usually used.

The tray 2 is operated for storing and transporting the packages 1, and can be continuously supplied with the packages 1. Continuous supply of packages is carried out by a conventional method. For those equipped with M3,
The lid 3 and the tray 2 may be hinge-joined in a book mold type, or may be made into two completely independent pieces. The tray 2 and the lid 3 are made of, for example, a mesh shape, a sponge shape, or a plurality of grooves or spots to prevent the packaging body 1 from coming into close contact with the packaging body 1 on the surface that comes into direct contact with the tray 2 and the lid 3. Preferably, a material 4 with voids is applied so as not to obstruct the leakage of air inside the package to the outside when pressed. As the material 4 for this purpose, for example, felt or sponge is used.

The hollow body 5 is literally a bag-like object that is hollow inside and surrounded by a thin film. It is important that the material of the film is not stretchable, but it also needs to be bendable and have little bending fatigue. Examples include hard polyvinyl chloride and hard comb. The gas sealed inside the hollow body 5 may be any gas, including air, as long as it is compressible at around room temperature. As with the tray 2 and the base 3, it is preferable that a material 6 having voids is pasted on the package contacting surface of the hollow body 5. Therefore, the hollow body 5 is a pressurizing plate 7 which will be described later.
It is assumed that the internal volume can be reduced during suppression. Incidentally, it is not necessary that one hollow body 5 corresponds to each of the 11 packages, and it is also possible to subdivide the hollow body 5 into several pieces so that the pressure change during compression can be read from each hollow body.

This is because when defective parts such as 7-1 are unevenly distributed, they can be detected early and sensitively.

A pressure plate 7 is provided at one end of the pressure device. The pressure plate 7 may be the same size as the package 10, or may be smaller than that, but if it is too small, there is a risk of perforation and tearing of the hollow body 5 or the package 1 that comes into contact with it, so it should not be too small. ) direction force = y/N0 The Karo pressure plate 7 is for pressing the package 1 through the hollow body 5 with the force transmitted to the shaft 8, and in Fig. 1 and below, pressure is applied to this.
It is equipped with Kasensa 9. That is, the pressure sensor 9i
Puncture the tube into the hollow body and remove the tube from the hollow body 5.
This makes it possible to read the pressure changes inside. However, it is also sufficient to make a tube pierced inside the hollow body 5 into a long, slender bow and attach the pressure sensor 9 in a place that does not cause vibrations other than the pressure plate 7 to reduce the constant error of the pressure change temperature 11. Conceivable. The pressure sensor 9 may be one with temperature compensation; or, when the hollow body 5 is subdivided into several parts, the pressure sensor 9 may be attached only to one or a part of the parts.

It is desirable to reduce the degree of suppression by 1 force less than the bursting strength of the package 1 so as not to damage the package 1, but on the other hand, as a requirement for detection accuracy, it is not practical unless the pressure exceeds a certain level. It becomes sexless. Specifically, the bursting strength of the bag depends on the material and thickness of the package 1, the material of the heat/ru material, etc., but it cannot be specified unconditionally, but the following is an example. The bursting strength of the bag obtained by sealing the laminated film of stretched polyester (thickness 12μ) - aluminum vapor deposition (thickness 50μ) - dry laminated non-yellow - unstretched polypropylene (thickness 25μ) was 62 to 82 J'. / cm', but about 1
/10 or about 6-8. When pressed with a pressure of P/crn≧, it was possible to sufficiently identify defective sealing products.

When the package 1 is pressed, the pressure inevitably changes slowly because the material 4 with voids is attached or air leaks from a poorly sealed package only after a certain level of pressure is applied. As a result, it becomes necessary to continue pressing for a certain period of time in order to identify defective products. However, from the standpoint of work efficiency, it is disadvantageous to continue pressing forever, so it is required to press for an appropriate period of time. In the case of the above-mentioned film package, the objective was achieved by setting the pressure-release cycle to 1.7 seconds, of which the net pressing time was 0.5 seconds. Alternatively, the pressure may be maintained for a certain period of time, and the tray conveyor may be operated at a constant speed, followed by a pressurizing machine, to operate in cycles of forward movement, backward movement, and suppression and release. In terms of the simplicity of the structure, the intermittent progress of the tray compare is good, but it is inferior in terms of efficiency.The pressing direction is either directly from the top of the tray 2 or downwards with a lid interposed between them. Fix the lid 3 and remove the tray 2.
There are two possible ways to press the entire tray 2 upward from the hill.

A case in which the package 1 fed onto a continuously advancing tray is pressed directly from above will be described below. first,
The pressing plate 7 can be moved forward and backward by a cam or the like as appropriate. The constant velocity portion of the cam is used in conjunction with the advancement of the pressure plate 7, thereby moving the slide block 12. While it is moving forward, the slide block 14 is slid and lowered onto the shaft 15 of the fixed bearing 16 by a separate cam, for example.
The shaft 8 is driven with the air cylinder 11 to lower it a certain distance, and the package 1 is pressed by the hollow body 5. In the case of the above-mentioned film package, it was sufficient to press the hollow body 5 further by about 3M after contact with the package 1. After temporarily stopping the hollow body 5 at that position and checking the change in the internal pressure of the hollow body, the pressurizing plate 7 is then attached to the slide plate 2.
The user repeatedly pulls up the claw 12 itself and returns it to its original position. At this time, the pressure increases from 0 to a constant pressure, and the pressure remains unchanged for good products, while the pressure gradually decreases for defective products.
Then, by pulling up the pressure plate 7, the pressure returns to 0 as before. Therefore, the pressure immediately before the pressure is released may be used as the standard for determining whether the product is good or bad.

The pressure indicated by the pressure 7/cer 9 is converted into an amplified IT flow according to a conventional method, inputted to the micro combinator, and the package 1 removal device is turned on and off based on the value or comparison with the standard putter 7.
By turning it off, it is possible to distinguish between non-defective products and defective products. This elimination device is not special, but for example, by turning off the solenoid valve.
Possible methods include blowing out compressed air to blow away the defective packaging, or using an air cylinder to push away the packaging.

[Brief explanation of drawings]

Fig. 1: A sketch of an example of the apparatus of the present invention while pressing a package. Fig. 2: A cross-sectional view of the main parts of Fig. 1. Fig. 3: Cross-sectional view of main parts of an example of the functions of the present device 1...Package 2...Tray 3...Lid 4...Gluing material 5... . . . Hollow body 6 . . . Baring material 7 . . . Pressure plate 8 . Shaft holding plate 11... Air cylinder 12... Slide block 13... Yaft 14... Slide block 15... Shaft 16... ... Fixed bearing 17 ... Conveyor patent applicant Ezaki Glico Co., Ltd. Nittsuko Co., Ltd. / Geneering Co., Ltd.

Claims (2)

[Claims] (1) Seal the packaging bag, place it in a tray or hold it between the tray and the lid, and press it from above and/or below through a hollow body made of a bendable, non-stretchable film. A method for detecting a poorly sealed package, characterized in that a poorly sealed package is identified based on a pressure change occurring in the hollow body. (2) A pressure device that has a tray for accommodating a package or a tray for holding a package and a lid, and that presses the package from above and/or below the tray, and is a part that comes into contact with the package. 1. A device for detecting a poorly sealed package, comprising: a hollow body made of a bendable, non-stretchable film; and a pressure sensor attached to the hollow body.