JP2989130B2 - Film foreign matter inspection system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film foreign matter inspection system for detecting how much foreign matter is mixed in a formed film. Here, the film is a broad concept including a sheet.

[0002]

2. Description of the Related Art As an apparatus for inspecting the quality of a film, for example, those described in JP-A-2-36339 and JP-A-58-108440 are known. However, at present, there is a demand for a device and a system that can be inspected with high reliability and ease. An object of the present invention is to provide such a film foreign matter inspection system.

[0003]

In order to achieve the above object, the invention according to claim 1 comprises a film forming mechanism, a winding mechanism for a formed film, and a foreign matter for detecting a foreign matter in the formed film. A film foreign matter inspection device comprising an inspection mechanism, wherein the film foreign matter inspection device is a film that is at a predetermined inspection position by the foreign matter inspection mechanism in a process of winding the film sent from the film forming mechanism by the winding mechanism. Is illuminated with a strobe from one side and is photographed with a CCD camera from the other side to detect foreign matter.The foreign matter inspection mechanism illuminates the film from below at the inspection position and raises the film at the inspection position And a CCD camera that shoots images from above. The CCD camera is arranged in a box opened below, The unit has a clean unit that sucks air through a filter.The clean unit is set to a higher degree of cleanliness than the cleanroom inside the clean room. Is blown toward the upper surface of the film.

According to a second aspect of the present invention, in addition to the configuration of the first aspect of the present invention, a clean room in which a film foreign matter inspection device is installed is provided. Have been.

According to a third aspect of the present invention, in addition to the configuration of the first aspect, the foreign matter inspection mechanism includes a strobe for illuminating the film from below at the inspection position, and a CCD for photographing the film from above at the inspection position. The winding mechanism includes a receiving plate and a holding plate for pressing the film at the inspection position from above and below to prevent vertical vibration.

[0006]

According to a fourth aspect of the present invention, in addition to the configuration of the first aspect, the foreign matter inspection mechanism is slidable in a direction perpendicular to the traveling direction of the film moved by the winding mechanism. I have.

[0008]

FIG. 1 is a front view of a film foreign matter inspection system according to the present invention. This system includes a film foreign matter inspection apparatus 1 and a clean room 2 in which the apparatus 1 is installed.
And

The film foreign matter inspection apparatus 1 includes a film forming mechanism 3, a winding mechanism 4 for a formed film, and a foreign matter inspection mechanism 5 for detecting foreign matter in the formed film. FIG. 2 is an enlarged front view of the winding mechanism 4, and FIG. 3 is a view taken in the direction of the arrow III in FIG. 4 is a side sectional view of the foreign matter inspection mechanism 5, and FIG. 5 is an enlarged front sectional view of the foreign matter inspection mechanism 5.

The clean room 2 is set to have a cleanness that does not include any foreign matter within the detection range of the foreign matter inspection mechanism 5. Specifically, the size of the foreign matter in the detection target range by the foreign matter inspection mechanism 5 is 1 to 20 μm, and the cleanness of the clean room 2 is a cleanliness class 4 in JIS B9920.

The film forming mechanism 3 includes a hopper 31 serving as an input port of resin or the like as a raw material of the film, a melting section 32 for melting the raw material, a gear pump 33 for homogenizing the molten raw material and applying pressure to deliver the molten raw material. And a die 34 for feeding the raw material sent from the gear pump 33 as a film through a slit. The melting section 32 is composed of a cylinder 321 and a screw 322.

The winding mechanism 4 includes first and second cooling rolls 4.
1, 42, first, second, third guide rolls 43, 44,
45, first and second take-up rolls 46, 47, take-up roll 4
8, a first motor 42a for driving the second cooling roll 42,
A second motor 47a for driving the second take-up roll 47, a third motor 48a for driving the take-up roll 48, and the like are provided.

The winding mechanism 4 cools the film 30 fed from the die 34 while passing through the first and second cooling rolls 41 and 42, passes through the first guide roll 43, and then cools the film 30. The guide rolls 44 and 45 are used to make the horizontal state.
Part of the film 30 leveled by the second and third guide rolls 44 and 45 in the traveling direction is an inspection position by the foreign matter inspection mechanism 5.

The first and second take-up rolls 46 and 47 are positioned above and below the film 30 so as to face each other.
Is held between the first and second take-up rolls 46 and 47. The first take-up roll 46 is pushed downward by an air cylinder 46a.

As shown by an arrow A in FIG. 4, the foreign matter inspection mechanism 5 is slidable in a direction perpendicular to the advancing direction of the film 30 at the inspection position, and is separated from the inspection position and the winding mechanism 4. It is set to the position. 61 and 62 are slide rails.

The foreign matter inspection mechanism 5 includes a strobe 51 for illuminating the film 30 from below at the inspection position, and a CCD camera 5 for photographing the film 30 from above at the inspection position.
2 is provided. 53 is a diffusion plate.

The CCD camera 52 is arranged in a box 54 opened downward. The box 54 has a clean unit 55 for sucking air through a filter 551.
Is provided. The clean unit 55 is set to a higher clean level than the clean level in the clean room 2. The air sucked from the clean unit 55 is blown from the lower opening 541 of the box 54 toward the upper surface of the film 30 at the inspection position.

In the winding mechanism 4, a receiving plate 71 and a pressing plate 72 as shown in FIG. FIG. 6 is a cross-sectional view of the film 30 as viewed from the direction of travel. FIG. 7 shows VII-VII of FIG.
It is sectional drawing. Both plates 71 and 72 are made of Teflon. The receiving plate 71 is attached to the frame 49 that supports the winding mechanism 4, and has a through hole 711 for transmitting light from the strobe 51 at the center. The holding plate 72 is naturally placed on the receiving plate 71 through two pins 712 erected on the receiving plate 71. The holding plate 72 has a through hole 721 at the center of the receiving plate 71 facing the through hole 711.
The lens 521 of the CCD camera 52 faces the through hole 721. That is, the film 30 passing between the receiving plate 71 and the pressing plate 72 is pressed from above and below by the two plates 71 and 72, and in this state, the CC 30 passes through the through hole 721.
The images are taken by the D camera 52. The weight of the holding plate 72 is
The horizontal movement at a constant speed is not impaired and the film 30
It is set to a size to which a load for preventing the vertical vibration of is applied.

The film forming mechanism 3 is controlled by a first control panel 8, and the winding mechanism 4 and the foreign substance inspection mechanism 5 are controlled by a second control panel 9.

Next, the operation of the film foreign matter inspection apparatus 1 will be described. This operation is performed in the clean room 2.

The raw materials such as resin charged into the hopper 31
It is melted while being carried by the screw 322 in the melting section 32, is made uniform by the gear pump 33, is applied with pressure, and is sent out to the die 34, and is sent out in a film shape through a slit of the die 34. The raw material delivered in the form of a film is cooled while passing through the first and second cooling rolls 41 and 42 to become the film 30. The film 30 is wound around a paper tube 48b of a winding roll 48 through first, second, and third guide rolls 43, 44, and 45. The second
Between the guide roll 44 and the third guide roll 45,
The film 30 is in a horizontal state, and is pressed by the first and second take-off rolls 46 and 47. In addition, the first
The second and third motors 42a, 47a and 48a operate the second cooling roll 4 so that the film 30 always moves at a constant speed.
2. The second take-up roll 47 and the take-up roll 48 are rotationally driven.

Then, the film 30 is placed at an inspection position between the second guide roll 44 and the third guide roll 45,
Inspection is performed by the foreign substance inspection mechanism 5. That is, the film 30
Is photographed through the through hole 721 of the holding plate 72 by the CCD camera 52 while being irradiated with light from the strobe 51 in the inspection position while being pressed from above and below by the receiving plate 71 and the holding plate 72. A foreign substance mixed in is detected. At this time, air sucked by the clean unit 55 is supplied from the inside of the box 54 to the lower opening 541 on the upper surface of the film 30 at the inspection position.
Sprayed through.

In such a film foreign matter inspection system, the film 30 formed by the film forming mechanism 3 is inspected by the foreign matter inspection mechanism 5 in the process of being wound by the winding mechanism 4. That is, the film 30
Are inspected automatically and easily.

Further, since the film foreign matter inspection apparatus 1 operates in the clean room 2, foreign matter in the range to be detected by the foreign matter inspection mechanism 5 does not mix with the raw material supplied to the hopper 31, and the inspection is performed. Film 30
It does not adhere to Therefore, only the foreign matter that has been mixed into the raw material from the beginning is detected in the film 30, and the reliability of the foreign matter inspection is improved.

The film 30 at the inspection position is
Since the receiving plate 71 and the pressing plate 72 are pressed from above and below, and vertical vibration is prevented, the CCD camera 52 is always in focus on the film 30. Therefore, the detection of the foreign matter is accurately performed.

Since air from the box 54 is blown onto the upper surface of the film 30 at the inspection position,
Foreign matter adhering to the film 30 is blown off in the clean room 2. In addition, since the air to be blown is set to a higher degree of cleanliness than the clean room 2 by the clean unit 55, foreign substances that may interfere with the inspection do not adhere to the film 30. Further, the cleanness of the clean room 2 is gradually increased by the clean unit 55. Therefore, also from these points, the reliability of the foreign substance inspection is improved.

Further, since the foreign substance inspection mechanism 5 can be set to the inspection position by sliding and the position deviating from the winding mechanism 4, it is necessary to set the foreign substance inspection mechanism 5 to a position deviated from the winding mechanism 4. Thereby, the film 30 can be easily mounted on the winding mechanism 4.

[0028]

As described above, according to the film foreign matter inspection system of the present invention, the following effects can be obtained. (1) According to the film foreign matter inspection system of the first aspect, the film 30 formed by the film forming mechanism 3
Can be inspected by the foreign matter inspection mechanism 5 in the process of being wound by the winding mechanism 4. Therefore, the film 30
Inspection can be performed automatically and easily. Further, since the air whose cleanness is further improved by the clean unit 55 is blown onto the upper surface of the film 30 at the inspection position, the reliability of the foreign substance inspection can be improved.

(2) According to the film foreign matter inspection system according to the second aspect, since the film foreign matter inspection apparatus 1 is installed in the clean room 2, foreign matter within the detection range of the foreign matter inspection mechanism 5 is reduced to the hopper 31. To be mixed with the raw material supplied to the film and to adhere to the film 30 to be inspected. Therefore, only the foreign matter that has been mixed into the raw material from the beginning can be detected in the film 30, and the reliability of the foreign matter inspection can be improved.

(3) According to the film foreign matter inspection system of the third aspect, since the receiving plate 71 and the pressing plate 72 can prevent the film 30 from vibrating up and down at the inspection position, the focus of the CCD camera 52 on the film 30 can be reduced. You can always match. Therefore, it is possible to accurately detect foreign matter.

[0031]

(4) According to the film foreign matter inspection system of the fourth aspect, the foreign matter inspection mechanism 5 is set at a position separated from the winding mechanism 4, so that the film 30 can be easily mounted on the winding mechanism 4. Can be performed.

[Brief description of the drawings]

FIG. 1 is a front view of a film foreign matter inspection system of the present invention.

FIG. 2 is an enlarged front view of a winding mechanism.

FIG. 3 is a view taken in the direction of the arrow III in FIG. 2;

FIG. 4 is a side sectional view of a foreign matter inspection mechanism.

FIG. 5 is an enlarged front sectional view of the foreign matter inspection mechanism.

FIG. 6 is a cross-sectional view showing a receiving plate and a holding plate as viewed from a traveling direction of a film.

FIG. 7 is a sectional view taken along the line VII-VII of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Film foreign substance inspection apparatus 2 Clean room 3 Film forming mechanism 4 Winding mechanism 5 Foreign substance inspection mechanism 30 Film 51 Strobe 52 CCD camera 54 Box 541 Lower opening 55 Clean unit 551 Filter 61, 62 Slide rail 71 Receiving plate 72 Press plate

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-58-173456 (JP, A) JP-A-58-67416 (JP, A) JP-A-4-359139 (JP, A) JP-A-7- 234191 (JP, A) Jiko 7-36272 (JP, Y2) (58) Field surveyed (Int. Cl. ⁶ , DB name) G01N 21/84-21/91

Claims (4)

(57) [Claims] 1. A film foreign matter inspection apparatus comprising a film forming mechanism, a formed film winding mechanism, and a foreign matter inspection mechanism for detecting foreign matter of the formed film, In the process of winding the film sent from the film forming mechanism by the winding mechanism, the foreign matter inspection mechanism illuminates the film at the predetermined inspection position from one side with a strobe and CC from the other side.
The foreign matter inspection mechanism includes a strobe for illuminating the film from below at the inspection position, and a CCD camera for photographing the film from above at the inspection position. The camera is placed in a box that opens downward, and the box is equipped with a clean unit that sucks air through a filter, and the clean unit is set to a higher degree of cleanness than the clean room, A film foreign matter inspection system wherein air sucked from a unit is blown out from a lower opening of a box toward an upper surface of a film at an inspection position. 2. The film foreign matter inspection system according to claim 1, further comprising a clean room in which the film foreign matter inspection device is installed, wherein the clean room is set to a cleanness that does not include foreign matter in a detection target range. 3. The foreign matter inspection mechanism includes a strobe for illuminating the film from below at the inspection position, and a CCD camera for photographing the film from above at the inspection position. 2. The film foreign matter inspection system according to claim 1, further comprising a receiving plate and a pressing plate that press against and prevent vertical vibration. 4. The film foreign matter inspection system according to claim 1, wherein the foreign matter inspection mechanism is slidable in a direction perpendicular to a moving direction of the film moved by the winding mechanism.