JPS6332388B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for preventing tampering with an adhesive label attached to a sealed position of a container, etc., and the adhesive label. Commonly used adhesive labels can be peeled off without leaving any traces by heating the adhesive layer and gently peeling it off. For this reason, in the case of adhesive labels that are used for sealing purposes, so-called removal or replacement accidents, in which the product sealed in the label is removed once from the package, the contents are removed, and then reattached, are common. do not have. Especially recently, incidents involving high-priced products such as pharmaceuticals have been occurring frequently. In addition, recently, new adhesive labels have appeared to eliminate such fraudulent acts, but they are still not perfect labels. For example, if a certain number of scratches are added to the label itself in advance and a malicious peeler pulls the label against the adhesive strength of the adhesive, part of the label will break and part of it will fall onto the package side. This is a method that leaves traces of opening. but,
By researching adhesives, those who commit fraud have learned how to open the label without cutting any part of the label, so even if a part of the label breaks, They also have the technology to hide any traces of opening by carefully returning the bag. That is,
Conventional adhesive labels have only considered how the label base material will break or tear in relation to the adhesive, and the label base material itself is relatively stiff and strong (elastic). Currently, it is possible to reapply without leaving any traces. In view of the above-mentioned circumstances, the present invention aims to provide a method for preventing tampering with an adhesive label, which always leaves traces of tampering and can detect tampering, and the adhesive label. That is, the present invention eliminates the above-mentioned defects, and one of the inventions is to attach a thin plastic film adhesive label to the sealing position of the container, etc., which causes residual strain only by the tensile force of peeling off the label, and once it is attached, Another invention relates to a method for preventing tampering with adhesive labels, which causes the plastic film to stretch under a constant tensile force that acts as a subsequent peeling effect, and makes it impossible to reapply without leaving a trace. This is an adhesive label that can be used directly for printing, and the label base material is a thin film made of plastic film with residual strain of at least 10% in the vertical direction. Next, the present invention will be explained based on drawings of embodiments as follows. 1 is a label base material of a plastic film such as polyethylene film, soft polyvinyl chloride film, polybutadiene film, etc., which has a small elastic modulus, a high elongation rate, and a large amount of residual strain, and a known adhesive is attached to the back side of the label base material 1. An adhesive label 3 is made by applying agent 2. In this case, label base material 1
is an ultra-thin film with a film thickness of 20μ to 50μ,
In addition, the amount of residual strain against tension in the longitudinal direction a is at least 10%. The adhesive label 3 constructed in this manner is attached to a predetermined sealing position, such as the lid of the box-like container A, using known means. After that, if an attempt is made to peel off the adhesive label 3 for the purpose of fraudulent activity, and the adhesive label 3 is pulled against the adhesive force of the adhesive 2, this extremely thin label base material 1 itself will be stretched and deformed. However, due to the residual strain at this time, it does not return to its original shape, and therefore, if an attempt is made to reattach it in this state, a trace will remain due to the residual strain. In this case, if the adhesive label 3 is further provided with a score line 4 (see Fig. 3B), cracks will appear from the score line 4 during peeling and the label will be cut off, making it impossible to reattach. Of course. Table 1 below shows the test results for the thickness, stress, and amount of residual strain for the label base materials of Examples.

[Table] However, adhesive strength is 550g, and pulling speed is 50m/mi.
n, sample width 15mm, chuck distance 50mm, measurement temperature 23℃ 65%RH Also, the sample display is PE...Polyethylene film (unstretched film) PE1-1...Does not include filler, transparent film PE1-2... ……Colored film with paint PE1-3……Matte processed film PE1-4……Includes filler, milky white film PE2-1……Contains filler, non-slip, milky white film PE2-2……Includes filler, high density PE, milky white film PE2-3...Including filler, high pressure, low pressure PE blend, milky white film Soft PVC...Soft PVC film Hard PVC...Hard PVC film PET...Polyester film Above Considering Table 1, it is preferable for the label to be stretched and deformed to 10% or more of the original length of the label in order to make it easier to find traces of tampering (based on experiments). If this 10% residual strain amount is used as the minimum limit label, then hard PVC, PET, polystyrene, and aluminum foil, which have no residual strain at all, will be excluded, and the target film base materials will be PE1-1 to PE2-3. It can be seen that polyethylene film, soft PVC, and polybutadiene film are preferred. Note that the stress applied to the adhesive label corresponds to the adhesive force of the adhesive. Adhesive strength is expressed as peeling force per 15mm label width. Therefore, if we consider the stress items in Table 1 as adhesive strength, if the adhesive strength is 400g, PE1-
4. PE2-1 gives an elongation deformation of 10% or more during peeling, but when the adhesive strength is 500g, PE2-1
-3. It can be seen that materials other than hard PVC, PET, polystyrene, and aluminum foil exhibit elongation deformation of 10% or more. In addition, in terms of film thickness, we measured types from 6μ PET to 50μ soft PVC, but the film thickness was
20μ polybutadiene film ~ 50μ soft PVC
is optimal. Although the amount of residual strain may be satisfied even if the film thickness is 20μ or less, when used as an adhesive label, it is recommended to use a 20μ film because adhesive labels are susceptible to other defects such as breakage during transportation of containers. The thickness is the lowest. This is not the case if the film can eliminate these defect factors. As described above, the present invention uses an adhesive label made of a thin plastic film base material with a residual strain of at least 10% in the vertical direction, so that even if an attempt is made to open the package, the film will not necessarily be stretched or deformed. It has the effect of leaving a trace, making it easy to detect tampering, and having the effect of preventing tampering.

[Brief explanation of drawings]

The drawings show examples of the present invention, and FIG. 1 is a graph showing the relationship between stress and residual strain, FIG. 2 is a graph showing the relationship between residual strain and thickness, and FIG. 3 is a graph showing the relationship between residual strain and thickness.
Figures A and B are plan views of the adhesive label, Figure 4 is a sectional view, and Figure 5 is a perspective view of the adhesive label in use. 1... Label base material, 2... Adhesive, 3...
... Adhesive label, 4... Cut line, a... Vertical direction.

Claims (1)

[Scope of Claims] 1. A thin plastic film adhesive label that causes residual strain due to label peeling tensile force alone is attached to the sealing position of a container, etc., and once attached, the plastic film is peeled off under a constant tensile force. A method for preventing tampering with an adhesive label, which is characterized in that the adhesive label is caused to elongate without duplication, and this deformation makes it impossible to reapply without leaving a trace. 2. The label base material is a thin plastic film such as polyethylene film, soft polyvinyl chloride film, polybutadiene film, etc., and the plastic film has a residual strain of at least 10% in the vertical direction, and the back side of the label base material An adhesive label that is coated with adhesive.