Heat-Shrinkable Laminated Film, Molded Product and Heat-Shrinkable Label Employing the Film, and Container
Inactive Publication Date: 2008-03-06
MITSUBISHI PLASTICS INC
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[0025] According to the present invention, a heat-shrinkable laminated film, which exhibits excellent shrink finishing quality, film rigidity (stiffness at room temperature), transparency at a time of addition of a reclamation material, and a small natural shrinkage and reduction of mechanical strength over time, with suppressed film interlayer peeling and shrinking stress, and which is applicable to shrinkable packing, shrinkable bond-packing, shrinkable label and the like, can be provided.
[0026] Further, according to the invention, a molded product and a heat-shrinkable label, which has sufficient film rigidity, exhibits excellent shrink finishing qu
Problems solved by technology
Among the above materials, polyvinyl chloride series heat-shrinkable film has problems such as lack of heat resistance and emission of hazardous gas like hydrogen chloride when it is burnt after its use.
However, the polystyrene series heat-shrinkable film also exhibits large natural shrinkage and low film rigidity (i.e. stiffness at room temperature), this film causes problems such as fitting defect due to the label bending during the label fitting process.
However, the shrink finishing quality of polyester series heat-shrinkable film is not as good as that of polyvinyl chloride series film (in other words, when the film is fitted as a label onto a container, by heat shrinkage, spots and wrinkles can be easily occurred.
), and this film causes problems such as significant drop of its mechanical strength over time.
Among the problems, embrittlement of the film over time tends to be caused when the film is stored for long term under an atmosphere of relatively high tempera
Method used
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Examples
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examples
[0131] The present invention will be described with examples as follows. Measurement values and evaluation criteria thereof shown in the examples are defined as follows. Here, a take-over (flow) direction of the laminated film is called as MD (Machine Direction), and a direction perpendicular to the MD is called as TO (Transverse Direction).
[0132] (1) Elongation Modulus
[0133] Elongation modulus was measured in a direction (MD) perpendicular to the film's main shrinking direction at 23° C. in accordance with JIS K7127. Results evaluated in line with the following criteria also shown in the tables.
[0134]⊚: elongation modulus is 1400 MPa or more;
[0135]◯: elongation modulus is 1200 MPa or more and below 1400 MPa;
[0136] and
[0137] x: elongation modulus is below 1200 MPa.
[0138] (2) Heat Shrinkage Ratio
[0139] A film was cut into pieces each having a size of 10 mm in MD and 100 mm in TD, and the pieces were respectively soaked in 70° C., 80° C., and 90° C. hot-water bath for 10 secon...
example a-1
[0177] As shown in Table 1, as a polyester series resin composition for the surface layer (S layer), a mixed resin composition having 100 parts by mass of PETG (“Copolyester6763” produced by Eastman Chemical Company) (hereinafter, refer to “PETG”.) and 10 parts by mass of PBT (DURANEX 2002 produced by Polyplastics Co. r Ltd., Tg=45° C., Tm=225° C.) (hereinafter, refer to “PBT 1”.) containing 0.05 mass % of amorphous silica of which average particle diameter is 2.4 μm (“Sylysia 320” produced by FUJI SILYSIA CHEMICAL LTD.) was used. Also, as a styrene series resin composition for the middle layer (M layer), a resin composition containing 100 parts by mass of a mixed resin composition having 45 mass % of SBS (styrene / butadiene=90 / 10, storage elastic modulus E′=2.5×109 Pa, loss elastic modulus E″ peak temperature-54° C., Vicat Softening point=76° C., hereinafter refer to “SBS1”.) and 55 mass % of SBS(styrene / butadiene=71 / 29, storage elastic modulus E′=2.1×108 Pa, loss elastic modulus E″...
example a-2
[0180] As shown in Table 1, except for changing the content of PBT 1 used for the surface layer (S layer) to 15 parts by mass, and changing the elongation temperature to 80° C., Example A-2 was conducted in the same manner as Example A-1; a heat-shrinkable laminated film and a recycled heat-shrinkable laminated film were obtained. The evaluation results of these obtained films are shown in Table 2.
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Abstract
The present invention provides a heat-shrinkable laminated film, which exhibits excellent film rigidity, shrink finishing quality, transparency of the recycled film, and a small natural shrinkage, with suppressed film interlayer peeling and shrinking stress, and which is applicable to shrinkable packing, shrinkable bond-packing, shrinkable label and the like. The heat-shrinkable laminated film comprises: a surface layer (S layer) composed of a polyester series resin composition containing a polyvalent carboxylic acid residue and a polyvalent alcohol residue; a middle layer (M layer) composed of a styrene series resin composition; and an adhesive layer (AD layer) which contains a copolymer of styrene series hydrocarbon and a conjugated dienic hydrocarbon or hydrogenated derivatives thereof, and having a styrene series hydrocarbon content rate to the entire copolymer or hydrogenated derivatives is 5˜40 mass % or less. An elongation modulus of the film in a direction perpendicular to a main shrinking direction of the film is 1200 MPa or more, and a shrinking stress in the main shrinking direction of the film is 8 MPa or less or a rupture elongation at 23° C. is 40% or more.
Description
TECHNICAL FIELD [0001] The present invention relates to a heat-shrinkable laminated film, a molded product and a heat-shrinkable label employing the film, and a container. More particularly, the present invention related to a heat-shrinkable laminated film, which exhibits excellent shrink finishing quality, film rigidity (stiffness at room temperature), transparency at a time of addition as a reclamation material, and a small natural shrinkage and reduction of mechanical strength over time, with suppressed film interlayer peeling and shrinking stress, and which is applicable to shrinkable packing, shrinkable bond-packing, shrinkable label and the like, and a molded product and a heat-shrinkable label employing the film, and a container. BACKGROUND ART [0002] These days, soft drinks such as juice are sold in a form that the drink is filled in containers such as glass bottles or SET (polyethylene terephthalate) bottles. When the drinks are on sale, in order to differentiate the goods ...
Claims
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Application Information
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