JP2012159365A - Cap sealing inspection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply, surely and safely inspect the quality of cap sealing by determining the quality of the cap sealing by a change in a ground part or height of a bottle due to decompression absorption.SOLUTION: A cap sealing inspection method of a bottle 1 absorbs decompression generated in a bottle body sealed by a cap 12 by depression displacement from an outward projected state of a bottom 5 of the bottle 1 to the inside. In the method, when a ground function part of the bottle 1 is not changed or when the height position of an upper end of the bottle 1 to be a test object is located higher than a height level of the upper end of the bottle 1 suitably deformed by decompression absorption, cap sealing of the bottle 1 is determined as defective. Thus, cap sealing is safely and simply achieved without requiring mechanical external force to the bottle body.

Description

  The present invention relates to a method for inspecting a cap seal in a synthetic resin round casing that absorbs this reduced pressure by a depression displacement at the bottom when the inside is in a reduced pressure state.

  Conventionally, polyethylene terephthalate (hereinafter referred to as PET) resin biaxially stretched blow-molded casings, so-called PET bottles, have excellent transparency, mechanical strength, heat resistance, gas barrier properties, etc., and are used for various beverages. Widely used as a container. Conventionally, there is a so-called high-temperature filling method for filling a PET bottle with content liquids such as fruit juices and teas that require sterilization, and the liquid content is filled into the casing at a temperature of about 90 ° C. Then, the cap is sealed and then cooled, and the inside of the housing is in a considerably reduced pressure state.

  It is necessary to reliably maintain and maintain the sealing by the cap, that is, from the viewpoint of maintaining the quality of the content liquid. For this reason, various methods have been proposed as a cap seal inspection method for inspecting the seal state with the cap. A typical conventional cap seal inspection method is to apply a constant pressing force from the outside to a non-inspected container as in the technique disclosed in Japanese Patent Application Laid-Open No. 2010-078453. This is to inspect whether or not a leak occurs in the seal portion due to the action of the pressing force.

  In this conventional technology, a specific defect state called “leak” occurs in the container after the inspection, so that the good and defective cap seal can be clearly shown, and a highly reliable inspection result can be obtained. There is an advantage that it is possible.

JP 2010-078353 A

  However, in the above-described prior art, since an external force is applied to the container by mechanical contact, the surface of the container, which is a product, may be damaged due to contact. There is a problem of reduction.

  In addition, in order to apply a constant external force to the containers in common, it is necessary to hold each container in a constant state, which complicates the structure of the inspection apparatus and increases the scale of the equipment. Since the pressing force should not be applied to the container in a shocking manner, there is a problem that a significant limitation is imposed on the speeding up of the inspection.

  Furthermore, even if the container is determined to be “good” for the seal inspection, if it is opened illegally before the purchase by the consumer, it is difficult for the consumer to identify the illegal opening. was there.

  Therefore, the present invention was devised to solve the above-described problems in the prior art, and the quality of the cap seal is judged by the change in the grounding part of the case or the change in the height of the case accompanying the absorption under reduced pressure. Therefore, it is an object to easily and reliably and safely inspect the quality of the cap seal.

Among the means for solving the above problems, the first main configuration of the present invention is as follows.
The bottom wall of the bottom that is connected to the lower end of the cylindrical body is positioned at the peripheral edge and can function as a grounding part, and the peripheral ridge that projects downward from the peripheral part and functions as the grounding part A biaxial stretch blow molding that absorbs the reduced pressure generated by heat-filling the content liquid when the concave deformation portion is depressed and displaced inwardly above the peripheral portion. It is a seal inspection method with a cap of a synthetic resin round housing,
Judging that the seal with the cap has not been properly achieved and maintained when the peripheral protrusion of the frame standing upright on the mounting surface functions as a grounding part,
It is in.

  The housing that has been filled with the liquid content and sealed with a cap and absorbed the reduced pressure generated inside by the depression displacement of the depression deformation portion at the bottom is the circumferential protrusion of the depression deformation portion that has not been depressed displacement before absorbing the reduced pressure. The state changes from a state where the function is used as the grounding part to a state where the peripheral part functions as the grounding part.

  Therefore, when the chassis standing upright on the mounting surface is seen and the grounding part of the chassis is a circumferential protrusion of the depressed deformed part, the seal with the cap of the chassis is incomplete It can be determined that the frame has already been opened.

  As described above, the first cap seal inspection method according to the present invention is to observe where the ground contact portion of the housing on the mounting surface is, so that a mechanical external force is applied to the housing body, There is no need for a process of holding the housing in a constant state.

Among the means for solving the above problems, the second main configuration of the present invention is as follows.
The bottom wall of the bottom that is connected to the lower end of the cylindrical body is positioned at the peripheral edge and can function as a grounding part, and the peripheral ridge that projects downward from the peripheral part and functions as the grounding part A biaxial stretch blow molding that absorbs the reduced pressure generated by heat-filling the content liquid when the concave deformation portion is depressed and displaced inwardly above the peripheral portion. It is a seal inspection method with a cap of a synthetic resin round housing,
If the upper end of the chassis standing upright on the mounting surface is positioned above the non-defective product height level, which is the height position of the upper end of the chassis for which sealing with the cap is appropriate, the cap Judged as a seal failure due to
It is in.

  The housing that has been filled with the content liquid and sealed with a cap and absorbed the reduced pressure generated inside by the depression displacement of the depression deformation part at the bottom is reduced in height by the downward protrusion of the depression deformation part. When a non-defective product, which is a housing in which the reduced-pressure absorption state is obtained, that is, a cap seal is properly achieved, is placed in an upright posture on a placement surface that provides a reference surface for detecting the height, Is not higher than the lower height level described above.

  On the other hand, a defective product that is a casing incompletely sealed with the cap sucks outside air into the inside due to the decompression generated inside, so that the depression displacement of the depression deformation portion at the bottom is sufficiently generated. No or no occurrence at all, so almost no change in height occurs. For this reason, when a defective product, which is a casing with an inappropriate cap seal, is placed in an upright position on a placement surface that provides a reference surface for detecting the height, the upper end of the cap seal is properly It is positioned higher than the height level of the upper end of the non-defective product that is achieved.

  Therefore, the height level of the upper end of the casing located on the mounting surface is detected, and the detection result is higher than the height level of the upper end of the non-defective product that is the casing in which the cap seal is properly achieved. In the case of higher rank, it can be determined that the seal by the cap of the casing is incomplete.

  As described above, since the cap seal inspection method is the detection of the height level of the upper end of the housing on the mounting surface, the external force is mechanically applied to the housing or the housing is held in a constant state. Processing is completely unnecessary.

  According to another configuration of the present invention, in the above-described second main configuration, the upper end of the housing on the mounting surface is detected by a height detection device, and the height detection device is positioned on the side of the housing. The detection height level set on the mounting surface and set in the height detection device is set within the range of the height difference between the non-defective product height level and the defective product height level. The height level is set to the height position of the upper end of the housing where the seal by the cap is inappropriate and the depressed deformed portion is projected downward.

  The detection height level is set within the range of the height difference between the non-defective product height level, which is the height level at the top of the non-defective product, and the defective product height level, which is the height level at the top of the defective product. In the case of detecting the upper end of the housing on the mounting surface by the height detecting device, the height detecting device directly detects a defective product that is a housing in which the seal with the cap is inappropriate.

  According to another configuration of the present invention, the height detection device in addition to the second main configuration described above has a gauge member disposed above the placement surface, and detects the lower end edge of the gauge member. The gauge member and the housing are moved relative to each other in parallel with the mounting surface.

  When the height detection device has a structure having a gauge member, it is possible to detect a defective product whose casing is not properly sealed with a cap by abutting the upper end of the casing of the gauge member. By using the relative movement of the gauge member and the housing, it is possible to apply an external force from the gauge member to the defective product.

  In another configuration of the present invention, the gauge member of the height detection device added to the second main configuration described above has a linear lower end edge parallel to the placement surface.

  When the gauge member of the height detection device has a linear lower end edge parallel to the mounting surface, the gauge member and the housing on the mounting surface are aligned along the vertical direction. There is no need to perform the operation, and the gauge member is always in a state of facing the housing on the mounting surface.

  In another configuration of the present invention, a height detector added to the second main configuration described above is disposed above the mounting surface, and a light projecting / receiving device that irradiates detection light in parallel with the mounting surface. The light projecting / receiving device is positioned at the detection height level, and the light projecting / receiving device and the housing are relatively moved parallel to the mounting surface.

  When the height detector is configured to have a projector / receiver, the detection data of defective products whose casing is not properly sealed due to the non-detection of the detection light by the receiver is contactless. Can be obtained at

  Moreover, the other structure of this invention adds that the mounting surface was made into the conveyance path surface of the conveyance path which conveys a housing to the above-mentioned 2nd main structure.

  In the case where the mounting surface is a transport path surface of the transport path of the housing, the cap seal can be inspected using the transport operation of the housing.

Since the synthetic resin casing of the present invention has the above-described configuration, the following effects are exhibited.
In the first main configuration of the present invention, since the quality of the cap seal is determined by identifying where the grounding portion of the housing on the mounting surface is, it is possible to determine the quality of the seal at a glance. This makes it possible to exert a high virgin property on the casing as a product.

  In the second main configuration of the present invention, since the height level of the upper end of the housing on the mounting surface is detected, an external force is mechanically applied to the housing, or the housing is held in a constant state. Since such processing is completely unnecessary, it can be implemented easily, safely and inexpensively with a simple configuration, and moreover, basically it is non-contact, so it is easy to speed up the detection operation. .

  It is suitable for detecting the upper end of the housing on the mounting surface with a height detection device that sets the detection height level within the range of the height difference between the non-defective product height level and the defective product height level. Thus, since the height detection device directly detects the defective product, it is possible to process the defective product.

  If the height detection device has a gauge member, it is possible to apply an external force from the gauge member to the upper end of the housing using the relative movement of the gauge member and the housing. By using this external force, the defective product is defeated, and the good product and the defective product can be easily selected and separated.

  If the gauge member of the height detection device is configured to have a linear lower end edge parallel to the placement surface, the gauge member will always face the housing on the placement surface, The mounting process while positioning the housing with respect to the mounting surface is not necessary, thereby simplifying the handling of the housing during inspection.

  If the height detector is configured to have a projector / receiver, defective product detection data can be obtained without contact, so this product can be used to easily select non-defective products and defective products. And can be sorted.

  In the case where the mounting surface is a frame transport path surface, it is possible to inspect the cap seal using the frame transport operation. Can be implemented easily.

It is the whole front view which cut through the principal part which shows the example of the bag main part to which the present invention is applied. FIG. 2 is an enlarged explanatory view of a main part of the bag main body cut longitudinally in FIG. 1. It is explanatory drawing which shows the difference in the grounding part and height level of the housing | casing in which a cap seal is appropriate, and the housing in which a cap seal is inadequate in the method of this invention. It is explanatory drawing explaining the height detection operation | movement of a housing by the height detection apparatus in the 2nd method of this invention. It is detection operation explanatory drawing by the gauge member which is a height detection apparatus in the 2nd method of this invention. It is detection operation explanatory drawing by the light projector / receiver which is a height detection apparatus in the 2nd method of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 and FIG. 2 show a structural example of a synthetic resin round bowl main body to which the method of the present invention is applied. FIG. 1 is a front view in which only the bottom portion 5 is vertically cut and FIG. 2 is a vertically cut bottom portion. 5 is an enlarged view of FIG. This bag body has a round tube body 2 having a mouth tube part 2, a cylindrical body part 3 and a bottom part 5. The body part 3 has a maximum diameter of 66 mm, an overall height of 134 mm, and a capacity of 280 ml. These are biaxially stretched blow molded products.

  The body portion 3 is provided with three circumferential grooves 4 which are trapezoidal square grooves. The circumferential groove 4 has a groove depth of 5 mm, an opening width of 5 mm, a bottom width of 1.75 mm, and a groove. The inclination angle of the side wall is 20 °.

  A bottom portion 5 is connected to the lower end of the body portion 3, and a bottom wall 6 (refer to FIG. 2) of the bottom portion 5 is formed with an annular flat peripheral portion 7 positioned at the peripheral end, It is comprised from the depression deformation part 8 located inside the peripheral part 7, and the depression deformation part 8 functions as a grounding part by making the lower surface protrude below the peripheral part 7 by a height H (see FIG. 2). It is comprised from the surrounding protrusion 10, and the depression recessed part 11 which made the inner side of the surrounding protrusion 10 a base end, and was depressed by the inside direction through the step part formed in the reduced diameter shape. In addition, a groove-like recess 9 is formed at the boundary portion between the inner peripheral edge of the peripheral edge portion 7 and the outer peripheral edge of the peripheral protrusion 10 by forming the bottom wall into a stepped shape in the inner direction.

  In the main body having the above-described structure, when the inside of the main body 1 is depressurized by cooling in a state of being sealed with the cap 12 after the high temperature filling process, the depressed deformed portion 8 of the bottom portion 5 is formed. Absorbs the reduced pressure generated by the depression displacement. At this time, the cylindrical shape is maintained without the body portion 3 being locally inverted and deformed by the effect of the peripheral rib 4.

  Further, in the state where the depressed deformed portion 8 is displaced upward due to the reduced pressure, the peripheral edge portion 7 functions as a grounding portion instead of the circumferential protrusion 10, so that the independence of the housing 1 is maintained even in the reduced pressure state. Is done. Here, by disposing the groove-shaped recess 9 at the boundary between the inner periphery of the peripheral edge 7 and the outer periphery of the peripheral ridge 10, the recessed shape of the depressed deformed portion 8 in the decompressed state starts from the groove-shaped recess 9. The upper displacement of the peripheral edge 7 can be smoothly advanced, and the deformation of the peripheral edge 7 can be suppressed, so that the function of the peripheral edge 7 as a grounding portion can be exhibited more stably.

  As described above, the depression displacement of the depression deforming portion 8 is performed by the pressure reduction generated in the bag main body, but in order to generate the pressure reduction in the bag main body, the seal by the cap 12 is properly achieved. is required. Therefore, in the case of the housing 1 in which the sealing by the cap 12 is properly achieved, that is, a non-defective product, the recessed deformation portion 8 is depressed and displaced, and the peripheral portion 7 functions as a grounding portion (the left housing in FIG. 3). 1), but in the case of the casing 1 in which the sealing with the cap 12 is not properly achieved, that is, a defective product, the depressed deformed portion 8 is not depressed and displaced, and the peripheral protrusion 10 functions as a grounding portion (see FIG. 3 on the right side of 3).

  For this reason, when observing the housing 1 standing upright on the mounting surface 16, in the case of a non-defective product, the peripheral portion 7 functions as a grounding portion (see the left housing in FIG. 3). On the other hand, in the case of a defective product, the circumferential protrusion 10 functions as a grounding portion (see the right side housing of FIG. 3). Judgment can be made.

  Further, when the good product and the defective product are erected on the same mounting surface 16 in an upright posture, the non-defective product height level L1 (see FIG. 3) which is a height dimension to the upper end of the good product and the upper end of the defective product are obtained. Is a height difference H (see FIG. 3) having the same dimension as the height H projecting downward from the circumferential ridge 10 between the defective product height level L2 (see FIG. 3). As a result, the height position of the upper end of the defective product is always located above the non-defective product height level L1. Therefore, when the height position of the upper end of the housing 1 on the mounting surface 16 is detected and this detection position is above the non-defective product height level L1, the housing 1 is regarded as a defective product. Can be determined.

  FIG. 4 shows a basic arrangement configuration in which the height detection device 13 detects the height position of the upper end of the housing 1 placed on the placement surface 16. The height position detection device 13 is disposed on the side of the housing 1 above the mounting surface 16 and the height L3 (see FIGS. 5 and 6) of the height position detection device 13 is set to a high level. It is set within the range of the difference H (see FIGS. 4, 5, and 6). By setting the detection height level L3 of the height position detection device 13 within the range of the height difference H, the height position detection device 13 does not detect the non-defective housing 1 (left side in FIG. 4). However, the casing 1 (right side in FIG. 4) which is a defective product is always detected.

  FIG. 5 is an explanatory diagram of the case where the housing 1 which is a defective product is detected by the height position detection device 13 having the gauge member 14, and the gauge member 14 has a linear lower end edge parallel to the mounting surface 16. The lower end edge is located within the height difference H and sets the detected height level L3. ing. When the detection portion of the height position detection device 13 is constituted by the gauge member 14, the lower end edge of the gauge member 14 hits the upper end portion of the housing 1 due to the relative parallel movement of the gauge member 14 and the housing 1. The housing 1 which is a defective product is detected by the abutting operation.

  FIG. 6 is an explanatory diagram in the case of detecting the defective housing 1 with the height position detecting device 13 having the light projecting and receiving device 15, and the light projecting and receiving device 15 is provided on the mounting surface 16. It is composed of a light projector and a light receiver that are arranged opposite to each other so as to irradiate detection light in parallel with the mounting surface 16, and the detection light is located within the range of the height difference H and has a detection height. Level L3 is set. When the detection portion of the height position detection device 13 is constituted by the light projector / receiver 15, the detection light from the light projector to the light receiver is transmitted to the housing 1 by the relative translation of the light projector / receiver 15 and the housing 1. The upper end of the light is shielded from light, and the housing 1 which is a defective product is detected by this light shielding.

  The relative movement of the height position detection device 13 and the housing 1 parallel to the placement surface 16 is easy to move the housing 1, but in this case, the transport device for the housing 1 that is a product is used. By setting the conveyance path surface of a part of the conveyance path as the mounting surface 16, the implementation can be performed easily and conveniently. That is, it is possible to detect the defective casing 1 using the conveying operation of the casing 1.

  In addition, when the conveyance path surface of the conveyance path that travels in a certain direction is used as the mounting surface 16, the lower end edge of the gauge member 14 of the height detection device 13 is set to a posture that intersects the conveyance direction. If the casing 1 which is a defective product is tilted by the upper end of the housing 1 abutting against the gauge member 14, it becomes easy to select defective products. In this case, by placing the gauge member 14 obliquely across the conveyance path surface that forms the placement surface 16, an abutting force that acts obliquely laterally from the gauge member 14 to the housing 1 is applied. Since the casing 1 is tilted obliquely in the lateral direction, the defective casing 1 that has fallen down by using the casing 1 can be dropped from the conveyance path to the side as it is, and can be sorted out.

  The casing 1 to be detected by the method of the present invention is not specified in the illustrated embodiment, and the grounding function part of the casing 1 is changed by the reduced pressure absorption, or the height dimension is reduced. Applicable to all round round enclosures.

  According to the cap seal inspection method of the present invention, the quality of the seal is determined based on whether or not the ground contact portion of the housing that should have been cap sealed changes or whether the upper end height position exceeds a preset height level. Therefore, it is not necessary to apply unnecessary external force to the non-defective casing, and it can be expected to develop a wide range of uses as a means of handling the casing as a product that is not subject to damage caused by external force. .

DESCRIPTION OF SYMBOLS 1; Housing 2; Mouth part 3; Trunk part 4; Circumferential groove 5; Bottom part 6; Bottom wall 7; Peripheral part 8: Depression deformation part 9; Groove-shaped recessed part 10; 13; Height detector 14; Gauge member 15; Projector / receiver 16; Placement surface L1; Non-defective product height level L2; Defective product height level L3; Detected height level H;

Claims (7)

The bottom wall (6) of the bottom (5) connected to the lower end of the cylindrical body (3) is positioned at the peripheral edge and can function as a grounding part (7), and the peripheral part (7 ) And a depressed deformed portion (8) having a peripheral protrusion (10) functioning as a grounding portion that protrudes downward from the outer peripheral portion), and the depressed deformed portion (8) is inwardly higher than the peripheral portion (7). A seal inspection method using a cap (12) of a biaxial stretch blow molded synthetic resin casing (1) that absorbs the reduced pressure generated by heat sinking the content liquid. When the circumferential protrusion (10) of the housing (1) raised upright on the mounting surface (16) functions as a grounding portion, the sealing by the cap (12) is properly achieved and maintained. Cap seal inspection method to judge that it is not done. The bottom wall (6) of the bottom (5) connected to the lower end of the cylindrical body (3) is positioned at the peripheral edge and can function as a grounding part (7), and the peripheral part (7 ) And a depressed deformed portion (8) having a peripheral protrusion (10) functioning as a grounding portion that protrudes downward from the outer peripheral portion), and the depressed deformed portion (8) is inwardly higher than the peripheral portion (7). A seal inspection method using a cap (12) of a biaxial stretch blow molded synthetic resin casing (1) that absorbs the reduced pressure generated by heat sinking the content liquid. The upper end of the casing (1) raised upright on the mounting surface (16) is the height position of the upper end of the casing (1) where the sealing by the cap (12) is appropriate. If it is positioned above the level (L1), it is determined that the seal is defective due to the cap (12). Ppushiru inspection method. The upper end of the housing (1) on the mounting surface (16) is detected by the height detection device (13), and the height detection device (13) is placed to be positioned on the side of the housing (1). The detection height level (L3) set above the surface (16) and set in the height detection device (13) is set between the non-defective product height level (L1) and the defective product height level (L2). The defective product height level (L2) is set to be within the range of the height difference (H), and the seal by the cap (12) is inappropriate, and the depressed deformed portion (8) remains protruding downward. The cap seal inspection method according to claim 2, wherein the upper end of the body (1) is at a height position. The height detection device (13) has a gauge member (14) disposed above the mounting surface (16), and the lower end edge of the gauge member (14) is positioned at the detection level (L3). The cap seal inspection method according to claim 3, wherein the gauge member (14) and the housing (1) are relatively moved in parallel with the placement surface (16). The cap seal inspection method according to claim 4, wherein the gauge member (14) of the height detection device (13) has a linear lower end edge parallel to the mounting surface (16). The height detection device (13) is arranged above the placement surface (16), and has a projector / receiver (15) that irradiates the detection light in parallel with the placement surface (16). The detector (15) is positioned at a detection height level (L3), and the light emitter / receiver (15) and the housing (1) are moved relative to each other in parallel with the mounting surface (16). The cap seal inspection method described. The cap seal inspection method according to any one of claims 2 to 6, wherein the mounting surface (16) is a transport path surface of a transport path for transporting the housing (1).

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