JP2720571B2 - Food can production line - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a production line for food cans, and more particularly to an arrangement in a factory for producing can bodies in a clean state.

[Prior Art] A can body manufacturing line in a can-making factory has conventionally been generally constituted by the following apparatus. The production line
A cupping press device for punching a cup from a thin metal plate, a deep drawing device for deep drawing the cup to form a can body of a predetermined length, a cleaning device for cleaning the can body, and an outer surface of the cleaned can body A printing device for printing a predetermined pattern on the
An oven device for fixing the printed pattern, an inner surface processing device for processing the inner surface of the can body, an opening processing device for processing the opening of the can body, and an inspection device for inspecting whether the can body is defective, And a shipping device for shipping the can body after the inspection.

Here, in a conventional can-making factory, each device constituting the above-mentioned can-making line is housed in one room.

It should be noted that the can body is sealed with a lid after the contents are packed in a food factory, and is made into a canned product.

[Problems to be Solved by the Invention] In the conventional can-making line, there is a problem that the cleanliness of the manufactured can body cannot be maintained and that printing on the outer surface of the can body is hindered.

That is, a large amount of water-soluble oil (coolant) is used for cooling and lubrication in deep drawing of a cup in the can making process, but mist-like coolant (mist) generated in this process floats in the factory. May adhere to the can body,
In the printing process, repelling of ink has been caused.

In addition, the can body for storing food must absolutely require the manufactured can body to be clean, but if mist adheres to the can body, the cleanliness cannot be maintained. This mist has become a hotbed of germ propagation. In can bodies used for foods (draft beer, carbonated beverages, etc.) that are not subjected to heat sterilization after filling in cans, mist adhering to the inner surface of the manufactured can body is a major hygiene problem. However, since such a can body is disposed of, the production cost is increased.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a production line for food cans that can efficiently produce a can body used for storing food in a clean state.

Means for Solving the Problems A production line for a food can according to the present invention, which achieves the above object and the present invention, comprises a can body forming step of forming a metal can body by deep drawing, and washing for cleaning the can body. In a food can production line comprising: A partition wall is provided in a chamber for accommodating a series of steps, and the chamber is divided into at least two chambers. A first chamber accommodates a step before the cleaning step and a second chamber includes A means for accommodating a later process and preventing air from flowing from the first chamber to the second chamber is provided.

Further, in the above invention, the air pressure in the second chamber is set to be higher than the air pressure in the first chamber to prevent the flow of air from the first chamber to the second chamber.

Further, in the above invention, in the first chamber, air is pressure-fed from the partition wall side and exhausted from the side opposite to the partition wall.

[Effects of the Invention] That is, in the steps after the surface treatment step of performing surface treatment on the can body, the mist of the coolant adheres to the can body, immediately impairing the cleanliness of the can body and hindering printing. Therefore, a partition wall is provided and the direction of the airflow is controlled so that the mist of the coolant does not flow into the processes after the surface treatment process.

Example A production line for a food can according to the present invention will be specifically described based on an example.

FIG. 1 is a schematic configuration diagram showing a food can production line according to one embodiment of the present invention.

First, an aluminum thin plate (having a thickness of about 0.3 mm to 0.35 mm) serving as a material for a can body is unwound from a roll by an unwinder 1 and continuously supplied to a cupping press 4 as a punching device. The cupping press 4 punches a thin sheet of aluminum to form a cup having a diameter of 7.5 cm to 8.9 cm and a depth of about 3 cm.

The cup continuously formed by the cupping press 4 is supplied to a draw and ioning press 6 on a transfer line 5 and formed into a can body by deep drawing while being cooled and lubricated by a coolant. The depth of the can body is adjusted by a trimmer 7, and thereafter, the can body is conveyed to a washer 8 as a cleaning device by a transfer line.

In this embodiment, the can and body forming step is constituted by the draw and ioning press 6 and the trimmer 7.

In the washer 8, the can body is washed with hot water and pickled to remove coolant and other contaminants, further subjected to a treatment for improving corrosion resistance, and dried by heating. After this cleaning step, the can body is supplied from the washer 8 to the base coater 11 via the transfer device 9, the accumulation zone 10 constituting the speed adjustment section, and the transfer device 12.

In the base coater 11, a white or transparent undercoat is applied to the outer surface of the can body, and thereafter, the undercoated can body is transferred to the base coater oven 15 by the transfer device 16.
The base coater oven 15 performs baking and drying of the base coating applied to the outer surface of the can body, and then transfers the can body to the transfer device 1
3, Accumulation zone 17, Printer 18 via transfer device 14
To supply.

The printer 18 prints a predetermined product name and a pattern on the outer surface of the can body on which the undercoat is applied, and the printed can body is supplied to the printer oven 20 by the transport device 19. The printer oven 20 prints and dries the printed product name and picture.

The can body that has been processed in the printer oven 20
The liquid is supplied to the inside spray 24 through the accumulation zone 23 and the transfer device 22. The inside spray 24 applies a resin film to the inner surface of the can body to prevent corrosion of the can due to foods contained therein. The can body having the resin film adhered to the inner surface is supplied to the inside spray oven 26 by the transfer device 25, and the resin film is dried and baked.

In the present embodiment, each device from the base coater 11 to the inside spray oven 26 constitutes a surface treatment step of performing a surface treatment on the outer surface and the inner surface of the can body as a whole.

The can body discharged from Inside Spray Oven 26,
It is transported to the Neckar flanger 28 by the transport device 27, where
The opening is subjected to multiple stages of drawing. After that, the can body is transferred to a light tester 30 as an inspection device by a transport device 29, and the light tester 30 optically detects a pinhole or the like and eliminates a defective product.

The can body determined as good by the light tester 30 is transported to the transport device 32.
Is sent to a balletizer 31 as a shipping device, and packed and shipped in a state sealed with a plastic film.

Here, the above-described series of steps are installed in one factory, but a partition wall 41 is provided at the position of the transfer device 10, and the inside of the factory is divided into two chambers R1 and R2. That is, the process before the cleaning process 8 is stored in the first chamber R1,
R2 contains the steps after the surface treatment steps 11 to 26, and isolates the steps after the surface treatment requiring cleanliness from the can body forming step in which coolant mist is generated.

Air is blown from the blower device 42 to each of the chambers R1 and R2. Here, a pressure regulator 43 is provided between the blower device 42 and the air supply ports 45 and 46 of the respective chambers so that the pressure in the second chamber R2 is higher than the pressure in the first chamber R1. Regulates the air flow that is pumped to Therefore, the partition wall
The direction of the air flow leaking from the gap 41 is the first from the second chamber R2.
Room R1 and the airflow containing coolant mist is
Flow from the first chamber R1 to the second chamber R2 is prevented, and the cleanliness of the second chamber R2 is maintained.

Further, in the first chamber R1, an air supply port 45 is particularly provided on the partition wall 41 side, and is provided on the opposite side to the partition wall 41 (ie, the second chamber R1).
The exhaust port 47 is provided on the side far from the chamber R2). That is, in the first chamber R1, air is pressure-fed from the partition wall side 41 and exhausted from the side opposite to the partition wall 41,
The airflow in the chamber R1 is in a direction away from the partition wall 41. Therefore, the airflow containing the coolant mist in the first chamber R1 is prevented from flowing to the second chamber R2,
From this point as well, the coolant mist is prevented from entering the second chamber R2.

As means for preventing the flow of air from the first chamber R1 to the second chamber R2, various known means can be used, or structural means such as increasing the airtightness of the partition wall 41 can be used. May be used.

[Effects of the Invention] As described above, the production line for food cans according to the present invention accommodates a first chamber for providing a partition wall to accommodate a process before the cleaning process and a process for the process after the surface treatment process. Second
The first chamber is isolated from the first chamber, and the flow of air from the first chamber to the second chamber is blocked, so that the coolant mist generated by the deep drawing of the cup in the can making process enters the second chamber. Can be prevented. For this reason, repelling of the ink or resin in the surface treatment in the second chamber can be prevented, and the manufactured can body can be kept clean, so that the product yield is greatly improved and the manufacturing cost is significantly reduced. be able to.

[Brief description of the drawings]

 FIG. 1 is a schematic diagram showing an embodiment of the present invention. 6 is a draw and ioning press, 8 is a washer, 11 is a base coater, 18 is a printer, 24 is an inside sprayer, 31 is a palletizer, 41 is a partition wall, 42 is a blower device, 43 is a pressure regulator, 45 and 46 are An air supply port, 47 is an exhaust port, R1 is a first chamber, and R2 is a second chamber.

Claims (3)

(57) [Claims] 1. A can body forming step of forming a metal can body by deep drawing, a washing step of cleaning the can body, and a surface treatment step of performing a surface treatment on an outer surface and an inner surface of the washed can body. And a shipping process for air-tightly packaging and shipping the surface-treated can body, in a production line for food cans, wherein at least 2
Divided into two chambers, a first chamber containing a step before the cleaning step, and a second chamber containing a step after the surface treatment step. A production line for food cans, characterized in that a means for preventing air flow to the food is provided. 2. The food according to claim 1, wherein the air pressure in the second chamber is higher than the air pressure in the first chamber to prevent the flow of air from the first chamber to the second chamber. Production line for cans. 3. The food can production line according to claim 1, wherein in the first chamber, air is pressure-fed from a partition wall side and exhausted from a side opposite to the partition wall. .