JPS6069533A - Method and machine for testing opening quality - Google Patents

Abstract

PURPOSE:To digitize blocking objectively by representing maximum friction stress between film surfaces when a blocking state is broken by twisting them in the opposite rotational directions as a torque value. CONSTITUTION:A sample, i.e. test-piece obtained by cutting a folded tubulr film to a proper size is fitted onto a sample fitting board 1. It is balanced with a balance weight 8, a constant load 9 is placed, and the side of the sample fitting board 2 is lowered to fix the test-piece on the sample fitting surface. An electric motor is switched on to rotate the sample fitting board 2. While the film test-piece is placed in the blocking state by the rotation of the sample fitting board 2, the sample fitting board 1 rotates simultaneously and a torque gauge operates to indicate a torque value. When the film test-piece exits from the blocking state to have an opening, the torque gauge is reset to the zero position and a relay operates at the same time. The maximum torque value when the blocking state is broken is read on a dial board with a discarded pointer 11.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for testing the openness of polyolefin tubular films (blown films) and an openness tester capable of measuring the openness.

Chicobler film is used for wrapping bags for packaging.When putting items into the bag, the opening of the bag in the folded state is easy to open, which greatly improves bagging work efficiency. Left and right. The properties of polyolefin resin have a large influence on this openness. Therefore, it is extremely important to measure the openness easily, quickly, and accurately in order to identify polyolefin resins that provide good openability.

The openness of tubular film is an extremely practical evaluation item, and is ranked among the top five by the world's most authoritative test.
Society for Testing klateri
als (American Society for Testing and Materials 1) ASTM Standard A
STMD1898-67 ('72), D1894-7
JD3854-74, etc. [Standard test method for blocking of plastic films] (ASTM
D189B-67 ('72)).

[Standard test method for friction coefficient of plastic film (
ASTM D1894-78), “Standard test method J for Plockknob load of plastic film by parallel plate method”
(ASTMD3854-74) alone was not able to perform a sufficiently practical) 1-valence test.

Therefore, the following sensory test was conducted as a practical evaluation method for openness. In other words, the folded film is cut with a sharp knife, and the degree of opening is sensually judged by applying force to move the cut edge with one's fingers, or by kneading it or blowing it with one's mouth if the cut edge is difficult to open. Mouth opening was determined by a non-standard sensory test. However, this method has large human errors and poor reproducibility;
An objective, quantitative, and practical method for determining the aperture of a film was developed. Therefore, the inventors of the present invention have conducted an accurate openness test free from human error, and as a result of intensive study on a method and measuring device that can objectively determine openness by quantifying the results, they have arrived at the present invention. be. In other words, the flatness is the degree to which the blocking of a resist-folded tubular film is released and the degree to which it opens. A constant load is applied between the sample mounting plates, and a force is applied in the opposite direction parallel to the film surface through the sample mounting plates. It was discovered that pro-noking can be objectively quantified by measuring it with a torque meter connected to.

Book 5t = light is when the inner surfaces of tubular films are in a blocking state and twisted in opposite rotation directions? The principle of the present invention is to express the maximum frictional stress between the film surfaces when the blocking state is broken as a torque value.1) The maximum frictional stress between the film surfaces when the blocking state is broken. is sandwiched between two sample mounting plates that are in a blocking state, a constant load is applied, and the sample mounting plates are twisted in opposite rotation directions, and when the blocking state is broken, the sample mounting plate 2) It has two upper and lower sample mounting plates 1 and 2 that sandwich a film-like sample, and the upper sample mounting plate is mounted at the tip of the arm 6. Board 2
Either an electric motor 5 or a torque J'18 for rotating the sample mounting plate is attached to the other end of the arm 6, and the sample mounting plate 2 and A balance weight 7 is attached to balance the load of either the , t[In2 or the torque meter 8, and a balance weight 9 is mounted on the arm 6 as a fulcrum to apply a constant load to the sample mounting board 2 as necessary. 10, and the lower sample mounting board l and the remaining one of the electric motor 5 and the torque meter 8 are mounted on the pedestal 14. Embodiments of the present invention will be described below with reference to the drawings. Figure 1 is a plan view of the test woodcutter viewed from directly above, and Figure 2 is an elevational view viewed from the side.

The sample mounting board 1 is connected to a torque meter 3, and the sample number board 2 is connected to a transmission device 4 (a continuously variable transmission made of a combination of tapered rolls, etc. and/or a stepped transmission made of a combination of gears).
Either one of the sample mounting plates connected to the electric motor 5 via the motor 5, for example, the sample mounting plate L in the illustrated case, is mounted on the rack ff314 together with the torque meter 3 with the sample face facing upward.
can be attached to. On the other hand, the sample mounting board 2 is attached to an arm 6 together with a transmission and an electric motor, and is balanced on a fixed balance weight 7 through the arm 6 with respect to a fulcrum IO. Arm 6 has a slide balance weight (
(with a stopper) 8 and 9 are attached, 8 is used for fine adjustment of balance, and 9 is used as necessary for applying a constant load to the sample surface when fixing the four-mouth type.

Note that 9 is convenient because it has a removable design. The sample mounting plate 2 can be moved around a fulcrum, and during the test of the mouth, the sample mounting surface and the sample mounting surface of the sample mounting plate 1 are placed so as to face each other with the sample sandwiched between them.

Opening property is indicated by torque value. The display mechanism is to connect a torque meter to a variable resistor, convert the torque value into an electrical signal, and then record it on a recording sheet and display it on the old dial 12 in the area corresponding to the rotational movement range. .

The shape of the sample mounting surface for sample mounting i1.2 may be any shape as long as it has the same shape when facing each other.

A circular shape is convenient.

There are various mechanisms for attaching the sample5.
available. For example, the sample mounting surface is made of fine wire mesh, and the inside of the sample mounting board is connected to a vacuum line, which creates negative pressure and the sample is mounted. Another method is to adhesively fix the sample by simply applying double-sided tape to the sample mounting surface. The scope of the present invention includes a mechanism in which a countless number of small needles or other pointed protrusions are provided on the sample mounting surface and the protrusions bite into the sample to fix the sample.

The position of the fulcrum 10 may be fixed to a certain sieve, but it is advantageous to have a mechanism in which it can be adjusted to any position at any time depending on the thickness of the sample. Specifically, a mechanism in which the branch 15 is composed of a shaft and a mantle that are in contact with each other through a thread or a thread groove can be mentioned.

If it is preferable to maintain the correct horizontal position of the sample mounting surface, it is appropriate to set up a level on the board and use a mechanism to control it. Describe.

fl) First, lift the sample mounting board (2 in the case) upwards about the fulcrum.

(2) Next, mount the sample (a test piece made by cutting a folded tubular film into an appropriate size) on the sample mounting board (1 for -). That is, the outer crystal on one side of the film test piece or the sample mounting surface is placed in a rectangular position 3 (3). The balance is balanced by balance way 1-8, a constant load is applied by 9, and the sample is mounted #L2. Gently lower the side. That is, the other outer surface of the film test piece is fixed to the sample mounting surface of the sample mounting board 2.

(By turning on the electric motor 41 and rotating the sample mounting board 2, which rotates the sample mounting plate 2, the sample mounting board 2 rotates, and while the film test piece is in the blocking state, the sample mounting plate 2 rotates.
rotate at the same time, the torque meter works, and the torque value is displayed.

Once the blocking state of the film test piece is broken, the torque meter returns to its normal position, and at the same time, the relay is activated and the switch of the Kame TfIJ machine is automatically turned off.

The maximum torque value when the blocking state is broken is collectively 1.
1 causes 7111 to appear on the dial.

The above is a summary of the operation method when using the present mouth opening testing device, but this is only one example, and the present invention is not limited to this example unless it exceeds the gist of the present invention.

As is clear from the above description, the present invention has the following excellent effects.

(B) The repeatability test, which until now relied on human testing methods, has been simplified and human error can be eliminated as much as possible.

(2) This improved reproducibility.

(3) The artificial testing method can only provide a graded rating of several stages at most, and we succeeded in quantifying the f-crowding and identifying subtle differences in mouth opening.

(4) It is now possible to measure openness under constant load.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing essential parts of an embodiment of the present invention, and FIG. 2 is an elevational view. 1.2...Sample mounting board 3...φ- Torque meter 4...Φ...Transmission device 5...e...Electric motor 6...Arm 7・・−・・Constant balance weight 8 ・ −・
・ ・ ・ ・Slide balance weight (for fine balance adjustment) 9 ・ ・ ・ ・ Fist ・ Exposed slide balance weight (for constant load application) 1O・−・・Fulcrum 11・・Discarded needle 12・・-・e・Dial 18・・@e・・Relay box 14・・・・ Frame 15・・・Pole 16・・11 Level procedure amendment (voluntary) 1981 6/r Japan Patent Office Commissioner Waka Shaobu pl l, Indication of the case, 1982 Patent Application No. 95210 2, Title of the invention: Mouth opening test method and mouth opening testing machine 3, Person making the amendment Relationship with the case Patent applicant address: 5-15 Kitahama, Higashi-ku, Osaka Name (20
9) Sumitomo Chemical Co., Ltd. Representative: Takeshi Hijikata 4, Agent address: 5-15-5 Kitahama, Higashi-ku, Osaka, Column 6 for detailed explanation of the invention in the specification to be amended, Contents of the amendment 1〉 Description From line 12 of page 6 to line 20 of the same page, "[1) Blocking...2) Film sample" is compared to "l) Folded film sample piece of tubular film in blocking state." , the outer surface of the - is in contact with the sample mounting board ■ connected to the torque meter, and the outer surface of the other - is in contact with the sample mounting board ■ connected to the motor, between the two sample mounting boards ■ and O. Apply a constant load between the
In this state, rotate the sample mounting board O by the electric motor.
A feature is that a frictional stress is generated between the two films, and when the probing state is broken, the frictional stress between the two films is read as a torque value using a torque meter connected to the sample mounting board. and 2) a film-like sample in a blocking state. 2) Submit the typed specification with the above amendments made. 7. List of Attached Documents Typed Specification Above 1. Title of the Invention: Patency Testing Method and Patency Testing Machine 2. Claims 1) A folded film sample piece of a tubular film in a blocking state is prepared by folding a folded film sample piece of a tubular film in a blocking state on its outer surface. Connect both sample mounting boards so that the outer surface of the - is in contact with the sample mounting board ◎ connected to the motor, and the outer surface of the other - is in contact with the sample mounting board ◎ connected to the motor.
A constant load is applied between the two films and the specimen mounting board ■ is rotated by an electric motor in this state to create frictional stress between the two films, and when the blocking state is broken, the two films A method for testing the openness of tubular films, which is characterized by reading the frictional stress between them as a torque value using a torque meter connected to a sample mounting board. 2) It has two upper and lower sample mounting plates 1 and 2 that sandwich the film sample in the blocking state, and at the tip of the arm 6 there is an upper sample mounting plate 2 and an electric motor 5 or torque that rotates the sample mounting plate. One of the 8 in total is attached, and the other end of the arm 6 has a support 1 erected on a pedestal 14.
A sample mounting board 2 and a weight 7 are attached to the fulcrum 10 on the arm 6, and a balance weight 9 for applying a constant load to the sample mounting board 2 as required is mounted on the arm 6 on the side of the sample mounting board 2 with respect to the fulcrum 10. The lower sample mounting board 1 and the remaining one of the electric motor 5 or the torque meter 8 are mounted on the mount 14.
An opening tester characterized in that it is attached to the top. 8. DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for testing polyolefin tubular film (blown film) and an opening tester capable of measuring the opening. Tubular film is used to make bags for packaging. When putting items into this bag, the ease with which the bag can be opened when it is folded has a large effect on the efficiency of bagging. The properties of the polyolefin resin have a large effect on this openness. In order to identify polyolefin resins that provide good openness, it is extremely important to measure openness simply, quickly and accurately. The openness of tubular film is an extremely practical evaluation item, and is evaluated by the American 5ociety for Te5, which is a globally authoritative standard.
t,ing Materials (7) Rica Materials Testing Association) ASTM standard ASTMDI 89 B-67
('72'), Di 894-78, DB: f54
``Standard Test Method J for Blocking of Plastic Films'' (ASTMD1891-67 (
'72)) Standard Testing Method for Coefficient of Friction of Plastic Films (ASTMD1894-78), Standard Testing Method J for Blocking Load of Plastic Films Using the Parallel Plate Method (ASTM D8854-74), etc. are insufficient for practical use. It was not possible to perform a certain evaluation.Therefore, the following sensory test was conducted as a practical evaluation method for openness.In other words, the folded film was cut with a sharp knife, and the cut section was The openness is determined by a non-standard sensory test in which the openness is sensually judged by applying pressure to move the cut with your fingers, kneading it when it is difficult to open the cut, or blowing with your mouth. However, since such methods are subject to large human errors and lack reproducibility, there was a need for an objective, quantitative, and practical method for determining film aperture. The present invention was arrived at as a result of extensive research into a method and measuring device that could conduct an accurate mouth opening test free from human error and quantify the results to objectively determine opening opening. In other words, openness refers to the folded tubular
Since the blocking of the film is resolved and the film is easy to open when opened, the inventors sandwiched the two films in the blocking state between two sample mounting plates, applied a constant load, Forces are applied in opposite directions parallel to the film surface through the sample mounting plates, and the torque just before the blocking is removed and the film starts to slide is applied to a torque connected to one of the sample mounting plates. We discovered that blocking can be objectively quantified by measuring it with a rec meter. The principle of the present invention is that when a tubular film whose inner surfaces are in a blocking state is twisted in opposite rotation directions, the maximum frictional stress between the film surfaces when the blocking state is broken is expressed as a torque value. That is. That is, the present invention has the following advantages: 1) A folded film sample piece of T-neebler film in a blocking state is placed in such a way that its - outer surface is in contact with a sample mounting board (■) connected to a torque meter, and the other - outer surface is connected to an electric motor. Apply a constant load by placing it between both sample mounting plates ■ and 0 so that it is in contact with the connected sample mounting plate.
In this state, rotate the sample mounting board with the electric motor.
A frictional stress is generated between the two films, and when the blocking state is broken, the frictional stress between the two films is read as a Torref value by a torque meter connected to the sample mounting board. Tubular film opening test method, and 2) It has two upper and lower sample mounting plates 1 and 2 that sandwich the film sample in a blocking state, and the upper sample mounting plate 2 and the sample mounting plate are provided at the tip of the arm 6. Either an electric motor 5 or a torque meter 8 that rotates the board is attached, and a pedestal 14 is attached to the other end of the arm 6.
A balance weight 7 for adjusting the load M of either the electric motor 5 or the torque meter 3 is attached to the fulcrum 10 on the support 15 erected on the sample mounting board 2. Several balance weights 9 for applying a constant load are placed on the arm 6 on the sample mounting board 2 side with respect to the fulcrum 10, and the lower sample mounting board 1 and
This invention relates to an opening tester characterized in that the other one of the electric motor 5 and the torque meter 8 is mounted on a pedestal 14. Embodiments of the present invention will be described below with reference to the drawings. Figure 1 is a plan view of the test machine viewed from directly above, and Figure 2 is an elevational view viewed from the side. The sample mounting board 1 is connected to a torque meter 8, and the sample mounting board 2 is connected to a transmission 4 (a continuously variable transmission formed by a combination of tapered rolls, etc. and/or a stepped transmission formed by a combination of gears).
It is connected to the electric motor 5 via. Either one of the sample mounting plates, for example, sample mounting plate I in the illustrated case.
Place the mount 14 together with the torque meter 8 with the sample mounting surface facing upward.
can be attached to. On the other hand, the sample mounting plate 2 is attached to an arm 6 together with a transmission and an electric motor, and is balanced about a fulcrum 10 by a fixed balance weight 7 through the arm 6. Slide balance weights (with stoppers) 8 and 9 are attached to the arm 6.
9 is used for fine adjustment of balance, and 9 is used as necessary for constant load to be applied to the sample surface during aperture measurement. Note that 9 has a convenient removable structure. The sample mounting plate 2 can be moved by C around the fulcrum, and when measuring openness, the sample mounting surface is placed exactly facing the sample mounting surface of the sample mounting plate 1 with the sample sandwiched between them. Opening property is indicated by torque value. As a display mechanism, a torque meter is connected to a variable resistor, and the torque value is 1! Mechanisms for converting the signal into an aircraft signal and then recording it on recording paper or displaying it directly in digital form are also included within the scope of the present invention, but in the figure, a discarded needle ti is included.
This figure shows a mechanism for displaying information using a dial 12 attached to a portion corresponding to the rotational movement range. The shape of the sample mounting surface of the sample mounting plate 2 may be any shape as long as it has the same shape when facing each other, but a circular shape is particularly convenient. Various mechanisms can be considered for C as a mechanism for taking and attaching a sample. For example, the sample mounting surface is made of thin wire mesh and the inside of the sample mounting board is connected to a vacuum line to apply negative pressure to the sample. Various mechanisms are included within the scope of the present invention, such as a mechanism for fixing the sample with adhesive, and a mechanism for fixing the sample by providing numerous pointed protrusions such as small needles on the sample mounting surface and having these protrusions bite into the sample. It will be done. The position of the fulcrum IO may be fixed at a constant height, but it is advantageous to have a mechanism that can adjust the position to any height depending on the thickness of the sample. Specifically, for example, there is a structure in which the support 15 is composed of a shaft and a mantle that are in contact with each other through a thread or a thread groove. When it is preferable to maintain the correct horizontal position of the sample mounting surface, it is appropriate to provide a leveling base on the sample mounting board to confirm this. Next, the operating method for same-day measurement will be briefly described. (1) First, lift the sample mounting board (2 in the figure) above C around the fulcrum. (2) Next, attach the sample (a test piece made by cutting the folded tubular film to an appropriate size) on the sample mounting board (1 in the district). That is, the outer surface of one side of the film test piece is fixed to the sample mounting surface. (8) Balance with balance weight 8,
Apply a constant load and gently lower the sample mounting board 2 side. That is, the other outer surface of the film test piece is fixed to the sample mounting surface of the sample mounting board 2. (4) Switch on the electric motor and give rotation to the sample mounting board 2. By rotating the sample mounting plate 2, while the film test piece is in the blocking state, the sample mounting plate l
rotate at the same time, the torque meter works, and the torque value is displayed. When the blocking state of the film test piece is broken and opened, the torque meter returns to the zero position, and at the same time, the relay is activated and the 'C1 motor is automatically switched off. The maximum torque value when the blocking state is broken is 11 °C.
indicated on the dial. The above is an outline of the operation method when using the present openability tester, but this is only one example, and the present invention is not limited to this example unless it exceeds the gist of the present invention. As is clear from the above description, the present invention has the following excellent effects. (1) The openness test, which had previously relied on manual testing methods, has been mechanized and human errors have been eliminated as much as possible. (2) This improved reproducibility. (8) We succeeded in quantifying and identifying differences in the openness of a few seconds, whereas the manual test method could only provide a graded evaluation of several steps at most. (4) We were able to measure the openness under a constant load. 4. Brief explanation of the drawings Fig. 1 is a plan view showing the main parts of the embodiment of the present invention, and Fig. 2 is an elevational view. 1.2 ... Sample attachment Panel 8...Torque meter 4...Transmission device 5...Electric motor 6...Eye arm 7...Fixed balance weight 8... ...Slide balance weight (for balance adjustment) 9 ...Slide balance weight (for constant load application) 10 ...Fullin point it ...Discard needle 12 ... Dial 18... Relay box 14... Frame 15... Pillar 16... Spirit level procedure amendment (method) October 1980 Day 1 Incident Indication 1982 Patent Application No. 95210 2, Title of the invention: Mouth opening test method and mouth opening testing machine 3 Relationship with the case of the person making the amendment Patent applicant address: 5-15 Kitahama, Higashi-ku, Osaka Name (20
9) Sumitomo Chemical Co., Ltd. Representative Takeshi Hijikata 4 Agent Address 1'El106, 5-15 Kitahama, Higashi-ku, Osaka
N□04 ・No. 5, Date of amendment order September 25, 1980 (shipment date) 6. Specification first attached to the application subject to amendment Page 2 7, Contents of amendment Specification first attached to the application As shown in the engraving and attached sheet on page 2 of the book (no changes to the content)

Claims (1)

[Claims] 1) A folded film sample piece of tubular film in a blocking state is placed in such a way that its - outer surface is in contact with a sample mounting board (■) connected to a torque meter, and the other - outer surface is in contact with an electric motor. A constant load is applied between both sample mounting plates ■ and [Yes] so that they are in contact with the connected sample mounting plate ■, and in this state, the sample mounting plate ■ is rotated by an electric motor to place the film between the two films. The U of the tubular film is characterized in that the frictional stress between the two films is generated when the blocking state is broken, and the frictional stress between the two films is read as a torque value by a torque meter connected to the sample mounting board. Abutment test method. (No change in content) 2) It has two upper and lower sample mounting plates 1 and 2 that sandwich the film sample in the blocking state, and the upper sample mounting plate 2 and the sample mounting plate are mounted at the tip of the arm 6. Either an electric aluminum 15 or a torque meter 3, which rotates the mounting board, is attached to the other end of the arm 6, and the sample mounting board 2 and ,
Balance weight 7 for balancing the load of either the electric motor 5 or the torque meter 3
is attached, and a balance weight 9 for applying a constant load to the sample mounting board 2 as necessary is mounted on the arm 6 on the sample mounting board 2 side with respect to the fulcrum IO, and the lower sample mounting board l and, An opening tester characterized in that the remaining one of the electric motor 5 and the torque meter 3 is mounted on a pedestal 14.