Method for testing the opening pull of a carton and sample therefor

Abstract

A method for testing the opening force of a carton and a sample thereof, the sample being cut from the top of a carton, the sample comprising a fixed unit and a side seal unit, the fixed unit having a lower clamping portion and a pair of upper outer wall panels intersecting each other in a V shape, the side seal unit having a pair of upper inner wall panels and an outer protrusion, the cross section of the outer protrusion being in an inverted V shape, the lower clamping portion being clamped in a lower clamp set of a tensile testing machine, the outer protrusion being clamped in an upper clamp set, the upper clamp set being operated to pull upward at a constant speed relative to the lower clamp set, and the maximum force in kg of the inner bonding lip of the upper inner wall panel separating from the upper outer wall panel being recorded, so as to measure the opening force of the carton.

Description

TECHNICAL FIELD

[0001] The present invention relates to a kind of packaging container, in particular to a kind of paper box opening place tensile test method and its sample. BACKGROUND

[0002] Liquid paper box package is a kind of composite paper plastic packaging composed of multiple layers of materials (including paper layer, inner and outer PE film layer, and possibly added barrier layer), which looks like a roof shape, and contains fresh milk, juice, drinks, etc., because of its preservation and convenience, it is widely used by dairy and beverage companies around the world.

[0003] As shown in Figure 1 , the liquid paper box package container includes a box body 1 and a box top 2 integrally connected to the box body 1, the box top 2 includes two top inclined walls 201, two outer bonding lips 202 respectively connected to the top inclined walls 201, two pairs of inner inclined walls 203 intersectingly connected to the top inclined walls 201, two pairs of inner bonding lips 204 respectively connected to the inner inclined walls 203, and a pair of side inclined walls 205 connected between the inner inclined walls 203. Figure 1 In a closed state, the outer bonding lips 202 are adhered to each other, the inner bonding lips 204 are also adhered to each other, and each pair of inner inclined walls 203 and the corresponding side inclined wall 205 defines a laterally open triangular pyramid hole 206. The inner inclined wall 203 and the top inclined wall 201 interface respectively generate a slanted side edge 207.

[0004] As shown in Figure 2 , when opening the seal, the operator first applies force and the slanted side edge 207 moves away, and the corresponding inner bonding lip 204 and half the length of the outer bonding lip 202 are torn apart. Then, as shown in Figure 3 , the inner inclined wall 203 and the corresponding side inclined wall 205 are pushed outwards after applying force to the slanted side edge 207 with two fingers, until the inner bonding lip 204 and the outer bonding lip 202 are torn apart.

[0005] Although this kind of liquid paper box package has been used for many years, the sealing strength of the outer bonding lip 202 and the inner bonding lip 204 may still deviate, and if the sealing is too tight, it may fail to open or cause incomplete opening rupture, and if the sealing is too loose, it may cause leakage. Therefore, the sealing process of the production line must be controlled by establishing indicators, in order to balance the sealing and opening convenience. SUMMARY

[0006] An object of the present invention is to provide a paper box opening place tensile test method that can facilitate process control standardization.

[0007] The paper box opening place tension test method of the present application, comprising the following steps: (A) preparing a tension testing machine and a test sample, the tension testing machine having a lower clamp group and an upper clamp group capable of being raised relative to the lower clamp group, the test sample being taken from the top of a packaging container, the test sample including a fixed unit and a side sealing unit bonded to the fixed unit, the fixed unit having a Y-shaped cross section and having a lower clamping portion and a pair of upper outer wall plates connected to the lower clamping portion and intersecting each other in a V shape, each upper outer wall plate having an upper outer side edge, the side sealing unit having a pair of upper inner wall plates bonded to the upper outer wall plates, respectively, and an outer protrusion integrally connected between the upper inner wall plates, each upper inner wall plate having a substantially trapezoidal profile shape and having an inner bonding lip inside the upper outer side edge, the outer protrusion having an inverted V-shaped cross section, (B) the upper clamp group being located at a first position relative to the lower clamp group, so that the lower clamping portion of the test sample is clamped to the lower clamp group, and the outer protrusion of the side sealing unit is clamped to the upper clamp group, (C) operating the upper clamp group of the tension testing machine to rise from the first position to a second position relative to the lower clamp group, pulling at a constant speed and recording the maximum kilogram force of the inner bonding lip separating from the upper outer wall plate during the process.

[0008] The paper box opening place tension test method of the present application, the side sealing unit of the test sample prepared in step (A) further having a straight fold line provided between the upper inner wall plates, the outer protrusion having an oblique fold line connected to one side of the straight fold line, the oblique fold line having an inner end connected to the straight fold line and an outer end opposite to the inner end, a mark point being set at a length value of 25 mm of the straight fold line and part of the oblique fold line, the mark point being between the inner end and the outer end, and the upper clamp group being clamped to the mark point in step (B).

[0009] The paper box opening place tension test method of the present application, the rising speed of the upper clamp group relative to the lower clamp group in step (C) being 150 mm per minute.

[0010] The paper box opening place tension test method of the present application, the lower clamping portion of the fixed unit of the test sample prepared in step (A) having a closed side edge corresponding to the upper outer side edge and an open side edge opposite to the closed side edge along a horizontal axis, the lower clamping portion further having a pair of lower outer wall plates integrally connected to the upper outer wall plates, a pair of lower inner wall plates connected to each other and intersecting the lower outer wall plates, respectively, a pair of lower turning edges between each lower outer wall plate and the corresponding lower inner wall plate, and an upper turning edge between the lower inner wall plate connection, the upper turning edge approaching the upper outer wall plate, and the lower inner wall plate corresponding to one side of the closed side edge being sealedly connected to the lower outer wall plate.

[0011] Another object of the present application is to provide a paper box opening tensile test sample that can facilitate the standardization of process control.

[0012] The paper box opening tensile test sample of the present application is taken from the top of a packaging container, and comprises a fixing unit and a side seal unit bonded to the fixing unit. The cross section of the fixing unit is Y-shaped, and has a lower clamping portion and a pair of upper outer wall plates connected to the lower clamping portion and intersecting each other in a V shape. Each upper outer wall plate has an upper outer side edge. The side seal unit has a pair of upper inner wall plates bonded to the upper outer wall plates respectively, and an outer protrusion integrally connected between the upper inner wall plates. The profile of each upper inner wall plate is substantially trapezoidal, and has an inner bonding lip inside the upper outer side edge. The cross section of the outer protrusion is inverted V-shaped.

[0013] The paper box opening tensile test sample of the present application further has a straight fold line arranged between the upper inner wall plates. The outer protrusion has an oblique fold line connected to one side of the straight fold line. The oblique fold line has an inside end connected to the straight fold line, and an outside end opposite to the inside end. A mark point is arranged at a position 25 mm away from the straight fold line and part of the oblique fold line. The mark point is between the inside end and the outside end.

[0014] The lower clamping portion of the fixing unit of the paper box opening tensile test sample of the present application has a closed side edge corresponding to the upper outer side edge, and an open side edge opposite to the closed side edge along the horizontal axis. The lower clamping portion further has a pair of lower outer wall plates integrally connected to the upper outer wall plates respectively, a pair of lower inner wall plates connected to the lower outer wall plates respectively and to each other, a pair of lower turning edges between each lower outer wall plate and the corresponding lower inner wall plate, and an upper turning edge between the lower inner wall plates. The upper turning edge approaches the upper outer wall plate, and the lower inner wall plates are sealed to the lower outer wall plates on one side of the closed side edge.

[0015] The paper box opening tensile test sample of the present application has the following advantages. The manufacturing of the test sample and the tensile test performed on the test sample can measure and record the maximum kilogram force of the separation of the inner bonding lip of the upper inner wall plate from the upper outer wall plate, so as to achieve the purpose of energy analysis of the opening tensile force of the paper box opening. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a schematic view of a prior art liquid paper box packaging container;

[0017] Figure 2 is a schematic view of a first opening operation step of a prior art liquid paper box packaging container;

[0018] Figure 3 This is a schematic diagram of the second opening operation step of the existing liquid carton container;

[0019] Figure 4 This is a three-dimensional schematic diagram of the preparation of a sample for tensile testing at the opening of a paper box according to an embodiment of the present invention;

[0020] Figure 5 is another schematic diagram of the preparation of this embodiment;

[0021] Figure 6 3D is a schematic diagram showing the test sample of this embodiment having been prepared;

[0022] Figure 7 This is a three-dimensional schematic diagram from another perspective showing the completed preparation of the test sample of this embodiment;

[0023] Figure 8 This is a tensile test diagram of an embodiment of a method for testing the opening tensile force of a paper box according to the present invention;

[0024] Figure 9 is a schematic diagram showing the completion of the tensile test of this embodiment; and

[0025] Figure 10 4 is a corresponding curve diagram of the rising distance and the opening tension in the tension test of this embodiment. DETAILED DESCRIPTION

[0026] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0027] See Figure 6 and Figure 7 An embodiment of a tensile test sample 100 for a carton opening of the present invention includes a fixing unit 10 and a side sealing unit 20 bonded to the fixing unit 10 .

[0028] The cross section of the fixing unit 10 perpendicular to a transverse axis X is Y-shaped and has a lower clamping portion 11, and a pair of upper outer wall panels 12 connected to the lower clamping portion 11 and intersecting with each other in a V-shape. The lower clamping portion 11 has a closed side edge 111, an open side edge 112 opposite to the closed side edge 111 along the transverse axis X, a pair of lower outer wall panels 113, a pair of lower inner wall panels 114 respectively intersecting and connected with the lower outer wall panels 113 and connected to each other, a pair of lower turning edges 115 respectively located between each lower outer wall panel 113 and the corresponding lower inner wall panel 114 at the junction, and an upper turning edge 116 located between the lower inner wall panels 114 at the junction, and the lower inner wall panel 114 is sealed to the lower outer wall panel 113 on one side corresponding to the closed side edge 111. And as Figure 7As shown, the structure connecting the lower outer wall panel 113 and the lower inner wall panel 114 is in the form of an accordion fold in a cross section perpendicular to the transverse axis X. The upper outer wall panel 12 has an upper outer side edge 121 corresponding to the closed side edge 111, and an upper inner side edge 122 opposite the upper outer side edge 121 along the transverse axis X. The upper fold edge 116 approaches the upper outer wall panel 12.

[0029] The side closure unit 20 has a pair of upper inner wall panels 21 bonded to the upper outer wall panels 12, an outer protrusion 22 integrally connected between the upper inner wall panels 21, and a straight fold line 23 disposed between the upper inner wall panels 21. Each upper inner wall panel 21 is substantially in the form of a trapezoid, and has an inner bonding lip 211 inside the upper outer side edge 121, and a connecting edge 212 opposite the inner bonding lip 211. The outer protrusion 22 has a cross section perpendicular to the transverse axis X in the form of an inverted V shape (see Figure 7 ), and has an oblique fold line 213 connected to one side of the straight fold line 23, the oblique fold line 213 has an inner end 214 connected to the straight fold line 23, and an outer end 215 opposite the inner end 214. A mark point M is disposed at a length value of 25 mm measured from the straight fold line 23 and part of the oblique fold line 213, the mark point M is between the inner end 214 and the outer end 215.

[0030] Referring to Figure 4 , the paper box opening place pull test sample 100 is cut from a liquid paper box container 100', the container 100' includes a box body 1, and a box top 2 integrally connected to the box body 1, the box top 2 includes two top inclined walls 201, two outer bonding lips 202 connected to the top inclined walls 201 respectively, two pairs of inner inclined walls 203 connected to the top inclined walls 201 respectively, two pairs of inner bonding lips 204 (that is, the inner bonding lip 211) connected to the inner inclined walls 203 respectively, and a pair of side inclined walls 205 connected between the inner inclined walls 203. In Figure 1 the closed state, the outer bonding lips 202 are bonded to each other, the inner bonding lips 204 are bonded to each other, and each pair of inner inclined walls 203 and the corresponding side inclined wall 205 define a laterally open triangular pyramid hole 206. The inner inclined walls 203 and the top inclined walls 201 respectively generate a slanted side edge 207. The outer protrusion 22 is generated by the side inclined wall 205, the upper inner wall panel 21 is generated by the inner inclined wall 203 and the inner bonding lip 204, and the upper outer wall panel 12 is generated by half the length of the top inclined wall 201 along the transverse axis X and half the length of the corresponding outer bonding lip 202. As shown, the upper outer wall panel 12 of the test sample 100 is opened to be close to horizontal, and the opening angle of the upper outer wall panel 12 is substantially greater than 120 degrees. Figure 6 ​

[0031] The preparation steps of the test sample 100 are as follows:

[0032] Step 1: Along Figure 4 The imaginary line at the connection between the box body 1 and the box top 2 is cut, and the box top 2 is completely separated from the box body 1.

[0033] Step 2: If Figure 5 As shown, the side slanted walls 205 are folded inwards, and the top slanted walls 201 are relatively brought into contact (flattened).

[0034] Step 3: If Figure 6 As shown, force is applied to the inner inclined wall 203 to separate the inner inclined wall 203 in the opposite direction, and the outer lip 202 that was originally bonded is separated to half of its length. Then, after setting the mark point M, the side inclined wall 205 is pushed outward to produce Figure 6 and Figure 7 100 test samples.

[0035] The method for testing the tensile strength of a paper box opening of the present invention comprises the following steps:

[0036] Step (A): Prepare a tensile testing machine 200 (see Figure 8 ), and preparation as Figure 6 and Figure 7 The test sample 100 is shown. The tensile testing machine 200 has a lower clamp assembly 210 and an upper clamp assembly 220 that can be raised and lowered relative to the lower clamp assembly 210. The tensile testing machine 200 is a universal material testing machine model QC-506A2 manufactured by Guangli Instrument Co., Ltd.

[0037] Step (B): Figure 8 As shown, when the upper clamp group 220 of the tensile testing machine 200 is located at a first position relative to the lower clamp group 210, the lower clamp group 210 clamps and fixes the lower clamping portion 11 of the fixing unit 10 of the test sample 100, and the upper clamp group 220 clamps at the marking point M of the outer protrusion 22 of the side sealing unit 20.

[0038] Step (C): Figure 9 As shown, the upper clamp assembly 220 of the tensile testing machine 200 is operated to rise from the first position to a second position relative to the lower clamp assembly 210, pulling upward at a constant speed and recording the maximum kilogram force (kgf) during the separation process of the inner engaging lip 211 from the upper outer wall panel 12. In this embodiment, the rising speed of the upper clamp assembly 220 relative to the lower clamp assembly 210 is 150 mm per minute.

[0039] Assuming that the obtained liquid carton container 100' can be smoothly opened, and for example Figure 10 As shown, when the upper clamp group 220 of the tensile testing machine 200 rises relative to the lower clamp group 210, the maximum force required for the inner bonding lip 211 of the test sample 100 to separate from the upper outer wall plate 12 is 1.75 kgf. Through data collection of multiple batches, a proper standard range of the sealing characteristics of the liquid carton container production line can be established.

[0040] Therefore, by using the carton opening tensile test sample and the carton opening tensile test method of the present application, the opening tensile force of the obtained liquid carton container 100' can be tested, and the proper control range of the liquid carton container production line can be set according to the test data, that is, by adjusting the process parameters such as temperature, pressure, and heating area to achieve the ideal opening tensile force, so that the quality characteristics can be effectively quantified and controlled, meeting the needs of consumers for easy opening.

[0041] In summary, the carton opening tensile test method and sample of the present application are simple to make, test, and use, and can indeed achieve the purposes of the present application.

Claims

1. A method for testing the tensile force at the opening of a paper box, characterized by: It includes the following steps: (A) Preparing a tensile testing machine and a test sample, the tensile testing machine having a lower clamp group and an upper clamp group capable of rising and falling relative to the lower clamp group, the test sample being cut from the top of the packaging container, the test sample comprising a fixing unit and a side sealing unit bonded to the fixing unit, the fixing unit having a Y-shaped cross-section and comprising a lower clamping portion and a pair of upper outer wall panels connected to the lower clamping portion and intersecting with each other in a V-shape, each upper outer wall panel having an upper outer edge, the side sealing unit having a pair of upper inner wall panels respectively bonded to the upper outer wall panels, and an outer convex portion integrally connected between the upper inner wall panels, the contour shape of each upper inner wall panel being substantially trapezoidal and comprising an inner coupling lip located inside the upper outer edge, the outer convex portion having an inverted V-shaped cross-section; (B) the upper clamp group is located at a first position relative to the lower clamp group, so that the lower clamping portion of the test sample is clamped by the lower clamp group and the outer protrusion of the side seal unit is clamped by the upper clamp group; (C) operating the upper clamp assembly of the tensile testing machine to rise from the first position to the second position relative to the lower clamp assembly, pulling upward at a constant speed, and recording the maximum kilogram force during the separation process of the inner lip from the upper outer wall panel.

2. The method for testing the tensile force of a carton opening according to claim 1, wherein: The side sealing unit of the test sample prepared in the step (A) further has a straight fold line arranged between the upper inner wall panels, the outer convex portion has an oblique fold line connected to one side of the straight fold line, the oblique fold line has an inner end connected to the straight fold line, and an outer end opposite to the inner end, and a marking point is set at 25 mm when measuring the length of the straight fold line and part of the oblique fold line. The marking point is between the inner end and the outer end, and the upper clamp group in the step (B) is clamped at the marking point.

3. The method for testing the tensile force of a carton opening according to claim 1, wherein: The rising speed of the upper clamp group relative to the lower clamp group in step (C) is 150 mm per minute.

4. The method for testing the tensile force of a carton opening according to claim 1, wherein: The lower clamping portion of the fixing unit of the test sample prepared in the step (A) has a closed side edge corresponding to the upper outer edge, and an open side edge opposite to the closed side edge along the transverse axis. The lower clamping portion also has a pair of lower outer wall panels respectively integrally connected to the upper outer wall panel, a pair of lower inner wall panels respectively intersecting and connected to the lower outer wall panels and connected to each other, a pair of lower turning edges respectively located at the junction of each lower outer wall panel and the corresponding lower inner wall panel, and an upper turning edge located at the junction of the lower inner wall panels, the upper turning edge approaches the upper outer wall panel, and the lower inner wall panel is sealed to the lower outer wall panel on one side corresponding to the closed side edge.

5. A sample for tensile testing of a carton opening, characterized by: The tensile test sample at the opening of the carton is cut from the top of the packaging container. The tensile test sample at the opening of the carton includes a fixing unit and a side sealing unit bonded to the fixing unit. The cross-section of the fixing unit is Y-shaped and has a lower clamping portion and a pair of upper outer wall panels connected to the lower clamping portion and intersecting with each other in a V shape. Each upper outer wall panel has an upper outer edge. The side sealing unit has a pair of upper inner wall panels respectively bonded to the upper outer wall panels, and an outer protrusion integrally connected between the upper inner wall panels. The contour shape of each upper inner wall panel is substantially trapezoidal and has an inner lip located on the inner side of the upper outer edge. The cross-section of the outer protrusion is an inverted V shape.

6. The tensile test sample for the carton opening according to claim 5, characterized in that: The side sealing unit also has a straight fold line arranged between the upper inner wall plates, the outer convex portion has an oblique fold line connected to one side of the straight fold line, the oblique fold line has an inner end connected to the straight fold line, and an outer end opposite to the inner end, and a marking point is set at a length value of 25 mm between the straight fold line and part of the oblique fold line, and the marking point is between the inner end and the outer end.

7. The tensile test sample for a carton opening according to claim 5, characterized in that: The lower clamping portion of the fixing unit has a closed side edge corresponding to the upper outer edge and an open side edge opposite to the closed side edge along the transverse axis. The lower clamping portion also has a pair of lower outer wall panels respectively integrally connected to the upper outer wall panel, a pair of lower inner wall panels respectively intersecting and connected to the lower outer wall panels and connected to each other, a pair of lower turning edges respectively located at the junction of each lower outer wall panel and the corresponding lower inner wall panel, and an upper turning edge located at the junction of the lower inner wall panels, the upper turning edge approaches the upper outer wall panel, and the lower inner wall panel is sealed to the lower outer wall panel on one side corresponding to the closed side edge.

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