JP3854284B2 - Bag-making seal inspection device - Google Patents

Description

  The present invention relates to packaging bags used for packaging in various fields, such as packaging of foods such as pickles, frozen foods and dried foods, packaging of detergents, and packaging of pharmaceuticals, in particular, bag making materials using synthetic resin films. The present invention relates to a sealing property inspection of a packaging bag that is made to have an open portion in one direction by sealing in three directions.

  Packaging bags (bag making products) produced by sealing a synthetic resin film are often used for packaging that requires high airtightness. And in such applications, especially in applications where the airtightness directly affects the quality retention period of the packaging object, such as foods, the product is made into a bag product in the bagging process for packaging the packaging object. When a seal failure occurs, the bag-making product is regarded as a defective product in lot units delivered from the bag-making manufacturer to the bag-making product using manufacturer, for example, a food manufacturer. That is, if there is at least one defective bag-making product in the delivery lot, all the bag-making products in the delivery lot will be handled as defective products, resulting in a large loss.

  For this reason, in bag-making products, the airtightness, that is, the sealability of the seal portion is inspected after bag making. This sealing property inspection is usually performed by a bag manufacturer based on a standard set by a manufacturer of bag manufacturing products, and conventionally, the following inspection methods are generally used. There are two types of conventional inspection methods. One of them is an inspection method called shopper inspection in which the seal portion is peeled off and the resistance at that time is measured to evaluate the sealing performance (this inspection method is an expansion force test or inspection). Also called). The other is a pressure resistance test in which a bag product is filled with a liquid such as water, a predetermined pressure is applied to the bag product from the outside, the pressure is maintained for a predetermined time, and the sealing performance is evaluated based on the presence or absence of leakage of the filling liquid. is there. These two types of inspection methods are usually used in combination, and inspection by either inspection method is a laborious operation, which is a heavy burden for bag makers.

  In the case of heat sealing, the bag making product is sealed with a heat sealing apparatus using electric heat. The main causes of defective seals in the seal part are insufficient heating and excessive heating due to voltage fluctuations in the heat sealing device, and dust on the heating surface of the heat sealing device and the sealing part of the bag making material. There is adhesion. The occurrence of defective seals due to these is sudden. Therefore, if sampling for sealability inspection is performed at a sufficiently short time interval, even if a seal failure occurs, it is possible to finally make a product by simply eliminating bag-making products for the short sampling time. It is possible to effectively prevent a defective seal from entering a bag-making product shipped from a bag manufacturer.

  For example, Patent Documents 1 to 3 disclose examples relating to the sealing property inspection of bag-made products or the sealing property inspection of packaged products in which bag-packed products are filled with packaging objects.

JP 2001-33341 A JP 2003-246307 A JP-A-9-26408

  In the problem of poor sealing of bag-made products, the loss due to the occurrence of defective sealing can be reduced by shortening the sampling time for sealing property inspection and increasing the inspection frequency as described above. However, the conventional seal inspection as described above takes time and effort, and if the sampling time is shortened, much labor is required for the inspection. Therefore, as long as the conventional inspection method is used, it is practically difficult to make the inspection frequency sufficient, and as a result, the loss due to the seal failure cannot be ignored.

  Also, in the case of shopper inspection, the conventional inspection method is to inspect by peeling off the seal part of the bag-made product, so the relationship between the inspection result and the sealing property is not necessarily clear, the inspection accuracy is called The problem remains in terms. This is also true for the pressure resistance test. That is, for example, in the case of a package enclosing an inert gas, the sealing performance against a gas requiring higher airtightness becomes a problem, but it is not always sufficient as the inspection accuracy to inspect it with liquid encapsulation. Absent.

  The present invention has been made in the background as described above, and enables a test to be performed efficiently with a small amount of labor, and also enables a highly accurate and reliable test according to the actual situation. The purpose is to provide inspection equipment.

In the present invention in order to achieve the object, by heat-sealing in three directions bag making material with synthetic resin film, to check the sealing of the bag-making products that are Seibukuro to have an opening in one direction A pressure sensor for detecting an internal pressure generated in the bag making product by injecting an internal pressure gas into the bag making product to be inspected, and having an internal pressure gas injection port for injecting the internal pressure gas into the bag making product to be inspected Connected to the nozzle body, a pressure receiving body provided near the opening of the bag-making product to be inspected and provided with a sealing elastic layer on the surface in contact with the opening, and the opening A pressing body that is provided so as to be able to open and close in the direction of contact and separation of the press receiving body, and has a sealing elastic layer provided on a surface in contact with the opening portion , and the nozzle body from the opening portion to the bag making product. The tip of the In this state, the inner pressure gas is injected from the inner pressure gas injection port in a state where the opening is sealed, and the inside of the bag making product is in a predetermined inspection internal pressure state. When the internal pressure state is left for a predetermined time and the internal pressure state detected by the pressure sensor is detected and the obtained detection data is recorded, and when the internal pressure state detected by the detection sensor falls below a preset inspection internal pressure In addition to issuing a seal failure notification, the internal pressure gas is injected into the bag making product to break the bag, and the internal pressure state at the time of the broken bag is detected by the pressure sensor, and the inspection internal pressure is obtained from the broken bag internal pressure. And a control system .

  The bag-making seal inspection apparatus according to the present invention makes it possible to perform a seal inspection in a very short time of about several minutes per bag-made product, and therefore can greatly increase the inspection efficiency as compared with conventional inspection methods. . Moreover, the bag-making seal inspection device according to the present invention injects an internal pressure gas into the bag-making product to obtain an inspection internal pressure state, and is left in this state for a certain period of time to detect a seal failure based on the presence or absence of leakage of the internal pressure gas. Therefore, it is possible to inspect the sealing performance against the gas required for the bag-making product used for the packaging in which the inert gas is encapsulated, in a form that actually matches, and it is possible to perform inspection with higher accuracy and reliability.

  Hereinafter, preferred embodiments for carrying out the present invention will be described. FIG. 1 schematically shows the configuration of a bag-making seal inspection apparatus according to an embodiment. The bag-making seal inspection apparatus includes a nozzle body 1, a pressing body 2, a pressing receiver 3, a pressing cylinder 4 and a control system 5 as main elements.

  The nozzle body 1 is formed, for example, as a highly rigid block body using a material having high strength such as a metal material. The nozzle body 1 is an inspection target bag-making product W formed by the pressing body 2 and the pressing receiver 3 as described later. An outer shape for facilitating sealing of the open portion Wa is provided. In the example shown in the figure, a kamaboko shape is used as a shape for easy sealing. This nozzle body 1 functions to inject an internal pressure gas into the bag-making product W to be inspected and to detect the internal pressure of the bag-making product W that has received the internal pressure gas. For this purpose, the nozzle body 1 is provided with two internal pressure gas injection ports 6 and two communication ports 7 respectively. Each of the internal pressure gas injection port 6 and the communication port 7 is formed as an elongated through hole penetrating the nozzle body 1 in its axial direction, and its front end is opened to the front surface portion of the nozzle body 1. The internal pressure gas injection port 6 has a rear end connected to the gas injection pipe 8 so that the internal pressure gas can be supplied from the gas injection source 9 through the gas injection pipe 8. On the other hand, the communication port 7 has a rear end connected to the communication pipe 11, and is connected to the pressure sensor 12 via the communication pipe 11.

  The pressing body 2 and the press receiving body 3 are manufactured in a state where the tip of the nozzle body 1 is inserted into the bag-making product W at the opening portion Wa, that is, in a state where the opening portion Wa of the bag-making product W is covered with the nozzle body 1. It is used to seal the open portion Wa of the bag-making product W by sandwiching the bag product W and the nozzle body 1. For this purpose, both the pressing body 2 and the pressing receiver 3 are formed as a highly rigid and elongated rectangular parallelepiped block body using a material having high strength such as a metal material, like the nozzle body 1, and the pressing body 2. Is provided with a sealing elastic layer 2c on the pressing surface side, and the pressure receiving body 3 is provided with a sealing elastic layer 3c on the pressing receiving surface side. The elastic layer 2c and the elastic layer 3c are both formed of a highly elastic material such as a rubber material. In this embodiment, the elastic layer 2c of the pressing body 2 is formed of a slightly hard rubber material, and the elastic layer 3c of the pressing body 3 is formed of a softer rubber material than the elastic layer 2c.

  The pressing body 2 and the pressing receiver 3 are in a state where the space between them is widened (in the state shown in the drawing, in order to facilitate the operation when the bag product W is put on the nozzle body 1 prior to the inspection). It is necessary to correspond to this. For this purpose, the pressing body 2 is lifted by the suspension wire 13 so that a wide gap can be formed between the pressing body 2 and the pressing receiver 3. The lifting operation of the pressing body 2 by the suspension wire 13 can be performed by a foot pedal (not shown) connected to the suspension wire 13.

  The pressing cylinder 4 is used to apply to the pressing body 2 a clamping pressure in the clamping pressure between the bag product W and the nozzle body 1 by the pressing body 2 and the pressing receiver 3. The pressing cylinder 4 is usually formed of an air cylinder.

  The control system 5 includes various devices for controlling the injection of the internal pressure gas into the bag making product W by the nozzle body 1, controlling the operation of the pressing cylinder 4, and detecting and recording the internal pressure state of the bag making product W. It is formed. In the example of the figure, the internal pressure detection / recording unit 14, the inspection pressure setting unit 15, the bag breaking pressure setting unit 16, and the operation control unit 17 are configured as main elements.

  Next, the seal inspection work for the bag-making product in the bag-making seal inspection apparatus as described above will be described. The bag-making product W to be inspected differs in the type and thickness of the synthetic resin film of the bag-making material depending on its use, and the internal pressure applied in the inspection differs accordingly. The internal pressure for inspection is determined as a pressure lower by a certain level than the internal pressure at which the bag-making product W breaks, based on the internal pressure at which the bag-made product W is broken. Therefore, when inspecting bag-making products with new specifications, a bag breaking test is first performed.

  In order to perform the bag breaking test, first, the bag-making product W is put on the nozzle body 1 at the opening portion Wa. The setting operation of the bag making product W is performed by lifting the pressing body 2 with the suspension wire 13 and leaving a wide gap between the pressing body 3 and the pressing body 3. When the setting of the bag making product W is completed, the opening portion Wa of the bag making product W is sealed. For this purpose, by operating the pressing cylinder 4 by operating a foot switch (not shown) of the operation control unit 17, the pressing body 2 is lowered to move the bag-making product W and the nozzle body 1 between the pressing receiver 3. Clamping and clamping, that is, clamping. Note that it is dangerous if an inspection worker pinches a finger or the like during this clamping. Therefore, it is preferable to provide a safety mechanism for preventing this. As the safety mechanism, for example, a mechanism that provides a cover that covers a space for performing the setting operation of the bag-made product W and operates the pressing cylinder 4 on condition that the cover is closed is preferable.

  When the bag making product W is sealed, the bag breaking test mode is set by a button not shown in the figure, and then the injection of internal pressure gas (usually air) is started by the nozzle body 1, and the bag breaking pressure setting unit In step 16, the injection of the internal pressure gas is continued while gradually increasing the pressure of the internal pressure gas. As a result, when the inside of the bag-making product W reaches the bag breaking internal pressure, the bag-making product W is torn at a portion other than the side seal portion Sa and the bottom seal portion Sb to break the bag. This broken bag is detected as a rapid decrease in the internal pressure, and when the broken bag is reached, the injection of the internal pressure gas is stopped. The internal pressure state of the bag-made product W during this time is detected by the pressure sensor 12, and the result is recorded by a recording means (not shown) provided in the internal pressure detection / recording unit 14. Further, when the bag is broken, a notification means (not shown) provided in the internal pressure detection / recording unit 14 notifies the broken bag. The notification by the notification means is performed, for example, by turning on a lamp or sounding a buzzer.

  The bag breaking pressure can be known by the bag breaking test as described above. Therefore, a seal inspection is performed with the inspection internal pressure determined based on the bag breaking internal pressure. The inspection internal pressure based on the bag-breaking test can be automatically set, and is done as necessary. In the case of a bag-making product for which the inspection internal pressure is already known, the seal inspection is performed at the inspection internal pressure. In order to perform the seal inspection, first, the bag-making product W is set and the bag-making product W is sealed in the same manner as in the bag-breaking test. Then, a constant pressure inspection mode is set by a button that is not shown, and an inspection internal pressure is set by the inspection pressure setting unit 15, and injection of internal pressure gas by the nozzle body 1 is started. Then, injection of the internal pressure gas is performed until the bag-made product W reaches the internal pressure of inspection, and after reaching the internal pressure of inspection and the injection of internal pressure gas is stopped, the internal pressure is maintained for a certain time (for example, about 1 to 3 minutes). put. The internal pressure state of the bag-made product W during this period is detected by the pressure sensor 12, and the result is recorded by the recording means provided in the internal pressure detection / recording unit 14, and used as seal inspection data in quality control or the like.

  If there is a sealing failure in the bag-making product W, the internal pressure gas leaks from the defective sealing portion, and the internal pressure of the bag-making product W decreases during the standing. When the degree of decrease in the internal pressure becomes a certain level or more, it is detected as a seal failure by the seal failure detection means provided in the internal pressure detection / recording section 14, and the notification means provided in the internal pressure detection / recording section 14 detects the seal. Announce the defect. This notification is made by turning on a lamp or sounding a buzzer in the same manner as in the case of a broken bag.

  The above-described inspection work in the bag-making seal inspection apparatus according to the present invention can be performed in a very short time of about several minutes per bag-making product, and therefore the inspection efficiency is greatly improved as compared with the conventional inspection method. be able to. In addition, the bag-making seal inspection device according to the present invention injects internal pressure gas into a bag-making product to be inspected to bring it into an inspection internal pressure state, and in this state, it is left for a certain period of time to detect a seal failure by the presence or absence of leakage of internal pressure gas. Like to do. For this reason, it is possible to inspect the sealing performance against the gas required for the bag-making product used for the packaging in which the inert gas is enclosed, and it is possible to inspect with higher accuracy and higher reliability. Moreover, the bag-making seal inspection apparatus according to the present invention can actually determine the inspection internal pressure for each bag-making product by a bag-breaking test, and this can also increase the level of inspection.

  The present invention makes it possible to efficiently perform seal inspection necessary for quality control of bag-made products, and to make the inspection highly accurate and reliable. The present invention as described above can be widely used as useful in the field of bag making.

It is a figure which shows typically the structure of the bag making seal | sticker inspection apparatus by one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Nozzle body 2 Press body 2c Elastic layer of press body 3 Press receiving body 3c Elastic layer of press receiving body 6 Internal pressure gas injection port 7 Communication port 12 Pressure sensor W Bag making product Wa Opening part

Claims (1)

By heat-sealing in three directions bag making material with synthetic resin films, in bag-making seal inspection apparatus for inspecting the sealing of the bag-making products that are Seibukuro to have an opening in one direction,
A nozzle body provided with an internal pressure gas injection port for injecting an internal pressure gas into the bag-making product to be inspected, and connected to a pressure sensor for detecting an internal pressure generated in the bag-making product by the injection of the internal pressure gas;
A pressure receiver provided in the vicinity of the opening of the bag-making product to be inspected, and provided with a sealing elastic layer on the surface in contact with the opening;
A pressing body that is provided so as to be freely opened and closed in the contact and separation direction of the pressing receiver with the opening portion interposed therebetween, and a sealing elastic layer is provided on a surface in contact with the opening portion;
From the opening portion , the inner end of the bag body is sealed with the pressing body and the pressure receiving body so that the end portion of the nozzle body is inserted into the bag-making product. Recording means for injecting an internal pressure gas and leaving the bag-made product in a predetermined inspection internal pressure state for a predetermined time , detecting the internal pressure state during that time with the pressure sensor, and recording the obtained detection data;
When the internal pressure state detected by the detection sensor falls below a preset inspection internal pressure, a seal failure notification is issued, and the internal pressure gas is injected into the bag making product to break the bag. A bag-making seal inspection apparatus comprising: a control system that detects the internal pressure from the internal pressure of the bag breakage detected by the pressure sensor .

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