JPH0431218A - Device for removing wrinkle of deeply drawn vacuum packaging article - Google Patents

Abstract

PURPOSE:To obtain a packaging article having a good external appearance free from deformed shape or wrinkles by applying hot air stream only to an area having wrinkles thereon of film of a vacuum packaging article in a deep drawing vacuum molding machine and cooling an area free from wrinkles as it is. CONSTITUTION:Articles to be packed are packed in a deeply drawn bottom film 28 and a covering film 27 is placed thereon, which are subjected to vacuum packaging to form a packaging article 1. The article 1 is intermittently transferred and positioned at a wrinkle removal device F, where a bottom cooling plate 6 of a cooling device held at 50 deg.C or lower is brought into contact with the bottom 20 of the article 1 and held in such a condition that a hot air blowoff port 11 is depressed to a level with the surface 21 of the bottom film. Next, a hot air jet blocking plate 9, which prevents hot air jet from string against articles adjacent the article 1 from which wrinkles are removed, is raised and makes contact with the rear surface of a flange 23 to prevent hot air jet and thereafter the hot air having been stored in a hot air generator is blown only to the surface 21 from the port 11 to cause the film to thermally shrink.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention solves problems in the appearance of packages and wrinkles in the film that occur on the surface of packages, which are the cause of pinholes that cause vacuum leaks. This invention relates to a wrinkle removing device for removing wrinkles.

[Conventional technology]

In the food field, processed meat products, fish paste products, and other shaped products are typically packaged using vacuum packaging machines, or wrinkles occur on the surface of the product packaging, especially on the bottom film. Currently, there are many products on the market.

However, in the case of vacuum packaging, it is not possible to make the dimensions of the molded product the same as the dimensions of the packaged object. If the dimensions are the same, it will be difficult to insert the packaged items, and the packaged items will be deformed and lose their shape during vacuum packaging. Also, productivity does not improve.

There are some variations in vacuum-formed products and objects to be packaged, so it may be necessary to make the dimensions of the molded product larger than the dimensions of the object to be packaged. The larger the dimensional difference, the more subtly it affects the surface of the package when it is vacuum packaged, and is a common cause of wrinkles in the film.

For this reason, wrinkles in the film have traditionally been thought to be unavoidable, and on the other hand, it has been a problem that has been sought to be solved as one of the main causes of packaging breakage due to pinholes during the production process and transportation. there were.

Furthermore, there is a trend among processing manufacturers to vacuum package large-sized molded products and objects of various sizes (combined products) in order to improve productivity, and wrinkles in the film on the surface of the packaged objects are becoming more and more noticeable. It appeared in

Therefore, as a method for removing wrinkles from the surface of the package, attempts have been made to remove wrinkles by spraying high-temperature steam after vacuum packaging to shrink the package film. In the case of fixed-sized products, not only the wrinkled parts of the film but also the completely unwrinkled parts tend to shrink due to heat, and new wrinkles may appear in the unwrinkled parts, and the entire film may shrink, causing damage to the packaging. This caused the body to lose its shape.

In addition, in the case of steam, there is a problem in the method of removing moisture remaining in the package, and it is necessary to re-dry the package to remove moisture.

In addition, the impact on adjacent packages and equipment is significant, so if steam is used, it is difficult to do so in a deep drawing vacuum forming machine, so it is difficult to remove wrinkles in a separate process. It is.

[Problem to be solved by the invention]

The present invention applies hot air only to the wrinkled portions of the film on the surface of the package of a regular product vacuum-packed in a deep drawing vacuum forming machine, and cools and protects the unwrinkled portions while maintaining their shape.
To provide a wrinkle removing device installed in a deep drawing vacuum forming machine in order to produce a package that does not lose its shape and has no wrinkles and has a good appearance.

[Means to solve the problem]

In order to solve the above problem, it is necessary to blow hot air at a temperature higher than the temperature of the hot air outlet or the forming temperature of the film onto the surface of the bottom film of the package, which is deep-drawn and vacuum-packed with film, so that the wrinkles of the film are removed. A blowing device that generates hot air is installed to blow only the hot air into the area to cause appropriate contraction, and at that time,
A cooling device for the bottom material film is installed to keep the unwrinkled bottom part of the bottom material film cooled to 50°C or less to prevent heat effects caused by hot air, and the flange surface (thermal sealing part) is heated by hot air. 50° to prevent thermal effects caused by
A flange cooling device is installed to keep the temperature below C, and a hot air jet is installed to prevent the influence of hot air on the front and rear packaging adjacent to the packaging to be wrinkled and other equipment. It is constructed as a hot air jet shielding device.

A hot air generation/blowing device is a holder that has a hot air outlet and a hot air outlet, and a heating element (aluminum cast heater) that is connected to the heater. When air is supplied, the compressed air passes through the inside of the heating element (heater) to become hot air, and the structure is such that the hot air is blown onto the surface of the package from the hot air outlet.

In the cooling device for bottom film, the cooling plate that contacts the bottom of the film bottom material is connected to a double cooling vibrator that penetrates through the center of the heater, and hot air is blown out [1 holder]. Keep the board in place. An air layer is provided at the contact area between the center of the heater and the cooling medium so that the heat of the heater is not lost to the cooling medium.

Cooling water is used as the cooling medium for the cooling plate, and the cooling plate is cooled with a double pipe structure.

The hot air generation blowing device and the bottom material film cooling device will have an integrated structure.

Cooling water is used as the cooling medium of the cooling plate of the cooling device for the flange part of the flange surface (thermal noll part) provided on the upper part of the package.

In addition, there is a hot air jet shielding plate that prevents the hot air from affecting adjacent packages and other equipment, or the hot air is shielded by contacting the back side of the film flange surface.

Regarding the relationship between the package and the hot air outlet, the shape of the outlet should match the shape of the package, and the length of the hot air outlet should match the length of the surface of the package (side surface of the bottom material film). It is most effective if it is combined.

The gap between the package and the hot air outlet may vary depending on the pressure and volume of the hot air and the shape of the package, but it is generally desirable to set it to about 3 to 5 m/m.

A heating element (heater) serving as a hot air source is provided at a position closest to the hot air outlet, and the hot air outlet holder is also made of a material with good thermal conductivity and is coupled to the heating element.

In addition, the hole inside the heater and the hot air outlet are staggered so that the hot air from the heater (heating element) mixes internally before reaching the hot air outlet, so that the hot air flowing from the hot air outlet is distributed evenly around the surrounding area. The temperature and air volume should be set to ensure that the air is blown onto the surface of the package.

The hot air outlet provided inside the hot air outlet holder and the holes provided inside the heater are provided at several locations evenly around the circumference, and the size and number of holes are determined by the dimensions of the package.

Considering the productivity, etc., the temperature of the hot air outlet used in the present invention should be at least the film forming temperature.
It is desirable that the temperature be 90°C or higher.

The above-described device is synchronized with devices in a typical deep drawing vacuum forming machine to provide a means for removing wrinkles.

[Function] When the packaged object is filled into a deep-drawn bottom material film molded product and vacuum-packed with a lidding film, the packaged object is intermittently transferred and stopped at the wrinkle removing device section. The flange surface cooling plate of the cooling device, which is kept cooled to below 50°C, descends to contact the film flange surface of the package, and a hot air blowing device and its The bottom material cooling plate of the cooling device for the bottom material film set inside rises at the same time, and the bottom material cooling plate of the cooling device, which is cooled and maintained at 50°C or less, contacts the bottom surface of the bottom material film of the package and heats up. The bottom cooling plate is kept pressed down until it reaches the air outlet or the bottom film surface, and then a device is installed to prevent the hot air from blowing onto adjacent packages before and after the package to be wrinkled. , hot air jet shield
After the plate comes into contact with the back side of the flange of the package and prevents the jet of hot air, the hot air stored inside the hot air generator is blown only onto the surface of the bottom film from the hot air outlet, and the film is heated. Heat shrink. Next, a package in which a shaped product such as sliced ham is used as a packaged object will be described in detail with reference to the drawings.

The device shown in FIG. 1 is explained in detail using drawings. It is a method in which hot air is blown only onto the bottom film surface 21 of the package l.
The hot air outlet 5 has a shape that follows the shape of the package 1, and is configured to blow hot air over the entire circumference of the bottom film surface 21 of the package 1.

A cast aluminum heater 12 is provided as a heating element for hot air, and the temperature is constantly controlled by a thermocouple 13.

The cast aluminum heater 12 has holes 8 through which compressed air flows into the heater, which are arranged in multiple stages around the circumference of the heater.

By supplying compressed air from the compressed air supply 1]+4, the compressed air passes through the air inlet hole 8 inside the cast aluminum heater 12 and is converted into compressed air or hot air, and then the hot air outlet hole 11 is converted into compressed air or hot air. The structure is such that the hot air passes through the hot air outlet 5 and blows out the hot air. Further, the amount of compressed air blown is controlled by opening and closing an air solenoid valve provided immediately before the compressed air supply port 14, and using a timer or the like to blow a constant amount.

When blowing the above-mentioned hot air, a bottom cooling plate 6 is required to cool the bottom surface 20 of the bottom film of the package 1.
Since it is incorporated as a device inside the hot air outlet 5,
The bottom surface 20 of the bottom material film can eliminate the influence of heat. This cooling device is configured to be moved up and down by an air cylinder 17 together with a hot air blowing device having a hot air blower 05, and is raised and activated when the package 1 stops being transferred. In addition, the bottom material cooling plate 6 contacts the bottom surface 20 of the bottom material film of the packaging body 1 when raised by the air cylinder 17, and is pushed down until the hot air outlet 5 is opened, or is provided at the bottom of the bottom material cooling plate 6. Due to the pressure of the spring 7, the bottom material cooling plate 6 is kept in close contact with the bottom surface 20 of the bottom material film and is cooled.

The strength of the spring 7 is such that it holds the bottom material cooling plate 6 and the bottom surface 20 of the bottom material film in close contact with each other, and prevents the package 1 from being deformed and hot air from entering the bottom surface 20 of the bottom material film. It is a thing of strength.

Since it is possible to control the temperature of the cooling medium of the bottom material cooling plate 6, it is necessary to maintain the cooling temperature at 50° C. or lower using cooling water.

The bottom material cooling plate 6 may be cooled by providing 15 and 16 cooling water supply and drainage ports, or may be provided with a device that cools and circulates cooling water within a constant temperature. The air cylinder 17 descends just before the package 1 is transferred.

In addition, when hot air is blown, the film flange surface 23 is wrinkled or bent due to the heat, so the film flange surface 23
A cooling device using a flange surface cooling plate 2 provided on the upper part of the flange prevents deformation due to heat.

The flange surface cooling plate 2 includes a guide pin 22 and a spring 4.
In a device configured with a cylinder 3, when the package l is stopped being transferred, the flange surface cooling plate 2 is tilted downward by the cylinder 3, and the cooling plate 2 is kept in contact with the film flange surface 23, thereby eliminating the influence of hot air. I can do it.

The flange surface cooling plate 2 is designed to rise just before the package 1 is transferred, and the spring 4 is configured to cause the flange surface cooling plate 2 to rise slightly due to the pressure of each cylinder provided at the bottom of the package 1. is taken into consideration. Flange surface cooling plate 2
Cooling water is used as a cooling medium, and the cooling water is passed through a cooling water supply/drainage port 19. The cooling temperature must be kept below 50°C.

Alternatively, the cooling water between the flange surface cooling plate 2 and the bottom material cooling plate 6 may be connected and used as a cooling water circulation device.

Also, when blowing hot air, the adjacent packaging bodies 18 located before and after the packaging body 1
In order to prevent thermal effects on the package 1 and other equipment, a device having hot air jet shielding plates 9 is provided before and after the package 1, and the hot air jet shielding plates 9 are composed of an air cylinder 10.
When the package I stops being transferred, the air cylinder 1O is used to prevent the hot air jet from flowing to the adjacent package 18 by contacting the hot air jet blocking plate 9 with the back surface of the upper sealing film flange surface 23.

Just before the package 1 is transferred, the hot air shielding plate 9 is lowered.

Since the hot air shielding plate 9 is cooled when it comes into contact with the flange surface cooling plate 2 when rising, there is no need to provide a cooling device.

Next, as shown in FIG. 2, a wrinkle removing device is constructed as one device in a general deep drawing vacuum forming machine, and a deep drawing vacuum forming machine with a wrinkle removing device is provided.

Unlike the steam method, it can be installed in a very small space.

Next, FIG. 3 is an explanation of the package l, in which the bottom material film 28
This is a package formed of a lid material film 27 and a lid material film 27. This is to explain wrinkles and pinholes that occur on the bottom material film surface 21.

〔Effect of the invention〕

According to the method of the present invention, the appearance of only the wrinkles present on the surface of the package of deep-drawn vacuum-packed processed meat products, seafood paste products, etc. is improved, and an overall appearance with high commercial value is obtained. The improvement in quality due to the reduction of pinholes that tend to occur in wrinkled areas is immeasurable.
It is possible to remove wrinkles in the deep drawing vacuum forming machine, thereby increasing production efficiency and reducing costs, resulting in a rational manufacturing method.

[Brief explanation of drawings]

The drawings show an embodiment of the wrinkle removing device according to the present invention, and FIG. 1 is a cutaway sectional view of the wrinkle removing device, and FIG. 2 is a schematic cutaway side view of a general deep drawing vacuum forming machine equipped with the wrinkle removing device. Explanatory drawing, FIG. 3 is an explanatory perspective view of a package.

Claims (1)

[Claims] (1) After filling the packaged object into a molded product that has been deep-drawn and vacuum-formed with a film and vacuum-wrapping it with a lidding film,
A hot air generation blowing device is installed to apply hot air at a temperature higher than the forming temperature only to the wrinkled areas on the surface of the bottom film of the package, and the hot air is not affected by the unwrinkled areas at the bottom of the bottom film. There is a cooling device for the bottom material film installed to prevent wrinkles from occurring, a cooling device for the flange portion installed to prevent the flange portion (thermal sealing portion) of the package from being affected by hot air, and a cooling device for the flange portion installed to prevent wrinkles from being affected by hot air. A wrinkle removing device for a deep-drawn vacuum package, characterized in that it is configured as a hot air jet shielding device provided to prevent thermal effects on the package and equipment adjacent to the front and rear of the package. .