JP4077978B2 - Anti-slip material - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In particular, the present invention relates to an anti-slip material made of a tape or a block-like grommet that imparts anti-slip performance to a polypropylene molded product.
[0002]
Examples of polypropylene molded products include pallets and various containers used for transporting and storing various articles. When the polypropylene molded product is a pallet, it is possible to prevent an article placed on the upper deck surface from slipping off the deck surface by attaching an anti-slip material to the upper deck surface of the pallet, or By installing anti-slip material on the lower deck surface, when the pallets are stacked, it is possible to prevent the pallet from moving in the horizontal direction. Furthermore, anti-slip material is applied to the top of the fork insertion port. By attaching, the upper surface of the fork comes into contact with the anti-slip material, and the pallet can be prevented from slipping with respect to the fork. In addition, when the polypropylene molded product is a container, an anti-slip material is attached to the back surface of the bottom of the container so that the container placed on the pallet or a conveyor device such as a belt conveyor slides down from the pallet or the conveyor device. Can not be.
[0003]
[Prior art]
In the Japanese Patent Application No. 11-001447, which is an earlier application, the present applicant has a fusion layer composed of a blend of 10 to 90% by weight of a non-crosslinked olefin copolymer rubber and 90 to 10% by weight of a polypropylene resin, An anti-slip material having a two-layer structure composed of a non-crosslinked olefin copolymer rubber (10 to 90% by weight) and an ethylene monoacetate copolymer (90 to 10% by weight) is blended into a polypropylene molded body. Proposed polypropylene molded article with anti-slip performance.
[0004]
[Problems to be solved by the invention]
The anti-slip material attached to the polypropylene molded body by fusing the anti-slip material having the two-layer structure composed of the above-mentioned fusion layer and the anti-slip layer to the polypropylene molded body, Since the boundary surface with the anti-slip layer is a flat surface and the contact area between the fusion layer and the anti-slip layer is small, the anti-slip layer is easily peeled off from the fusion layer.
[0005]
An object of the present invention is to solve the problems of the above-described anti-slip material.
[0006]
[Means for Solving the Problems]
In order to achieve the above-described object, the present invention provides an anti-slip material having a two-layer structure of a fusion layer and an anti-slip layer, and is formed on the corrugated surface formed on the upper surface of the fusion layer and the lower surface of the anti-slip layer. The corrugated surfaces are in close contact with each other, and a space is not formed on the boundary surface between the corrugated surface formed on the upper surface of the fusion layer and the corrugated surface formed on the lower surface of the anti-slip layer. In addition, the cross-sectional shape perpendicular to the longitudinal direction of the anti-slip material is formed in a substantially trapezoidal shape, and the pressing force of the pressing roller is applied only to the horizontal central portion of the top surface of the anti-slip material, so that the horizontal center The pressure roller is configured not to contact the inclined surface inclined downward in the side surface direction from the portion .
[0007]
【Example】
Examples of the present invention will be described below. However, the present invention is not limited to these examples as long as the gist of the present invention is not exceeded.
[0008]
Reference numeral 1 denotes a pallet as an example of a polypropylene molded product, and each side wall 2 of the pallet 1 is formed with two fork insertion ports 3 to form a so-called four-way pallet 1. Instead of the four-way pallet 1 shown in FIG. 1, a so-called two-way pallet 1 in which two fork insertion ports 3 are formed only on one opposing side wall 2 can be used. .
[0009]
Reference numeral 4 denotes a concave groove formed on the deck surface 5 of the pallet 1, and a plurality of concave grooves 4 are formed substantially parallel to one side wall 2 of the pallet 1. As shown in FIG. 1, the concave groove 4 can be formed to reach the end of the side wall 2 perpendicular to the concave groove 4, but up to the side wall 2 perpendicular to the concave groove 4. It can also be formed so as not to reach. As shown in FIG. 2, the concave groove 4 as an example is composed of a horizontal bottom surface 4 a and a side surface 4 b formed as a vertical surface, and a cross section perpendicular to the longitudinal direction of the concave groove 4. The shape is a horizontally long rectangle.
[0010]
As shown in FIG. 3, 6 is a tape-shaped anti-slip material comprising a lower fusion layer 6a and an upper anti-slip layer 6b. The upper surface of the fusion layer 6a and the lower surface of the anti-slip layer 6b are formed in a corrugated surface having the same corrugation, and the corrugated trough 6a ′ formed on the upper surface of the fusion layer 6a is prevented from slipping. The corrugated crest 6b ′ formed on the bottom surface of the layer 6b is fitted, and the corrugated crest 6a ″ formed on the top surface of the fusion layer 6a is corrugated formed on the bottom surface of the anti-slip layer 6b. The upper surface of the fusion layer 6a and the lower surface of the anti-slip layer 6b are in close contact with each other, and the boundary surface B between the upper surface of the fusion layer 6a and the lower surface of the anti-slip layer 6b The space portion is not formed. In the embodiment shown in FIG. 3, the corrugated valley 6a ′ and the crest 6a ″ formed on the upper surface of the fusion layer 6a and the corrugated crest 6b ′ formed on the lower surface of the anti-slip layer 6b. And the valley 6b "are formed in parallel with the longitudinal direction of the tape-shaped anti-slip material 6, but the direction perpendicular to the longitudinal direction of the tape-shaped anti-slip material 6, ie, The tape-shaped anti-slip material 6 can be formed in parallel along the width direction.
[0011]
As described above, the corrugated crest 6b ′ formed on the lower surface of the anti-slip layer 6b is fitted into the corrugated trough 6a ′ formed on the upper surface of the fusion layer 6a, and the fusion layer 6a. The corrugated trough 6b "formed on the lower surface of the anti-slip layer 6b is fitted to the corrugated peak 6a" formed on the upper surface of the adhesive layer, and the upper surface of the fusion layer 6a and the lower surface of the anti-slip layer 6b are The boundary surface B formed as a corrugated surface between the upper surface of the fusion layer 6a and the lower surface of the anti-slip layer 6b is formed so as not to form a space portion. Since the area of the boundary surface B between the fusion layer 6a and the anti-slip layer 6b is larger than that of the conventional anti-slip material in which the boundary surface of the stop layer is formed in a plane, the anti-slip layer 6b is separated from the fusion layer 6a. Hard to peel.
[0012]
The tape-shaped anti-slip material 6 composed of the fusion layer 6a and the anti-slip layer 6b can be molded by a usual method using a single screw extruder, a biaxial extruder, etc., respectively. It is preferable to perform integral molding using a molding machine.
[0013]
As the polypropylene material of the polypropylene molded product of the present invention, a propylene homopolymer or a block polymer of propylene and other monomers is desirable, but talc, calcium carbonate, glass fiber in the polymer depending on the application. A filler such as a foaming agent, a flame retardant, a coloring material, and the like may be blended, and additives such as an antioxidant, an ultraviolet absorber, and an antistatic agent may be added as necessary.
[0014]
The pallet 1 as a polypropylene molded body used in the present invention can be manufactured by molding such a polypropylene material by a normal molding method such as an injection molding method or an extrusion molding method.
[0015]
As described above, the anti-slip material 6 used in the present invention has a two-layer structure of a fusion layer 6a and a non-slip layer 6b on the pallet 1 as a polypropylene molded body.
[0016]
Of the anti-slip agent 6, the fused layer 6 a to the polypropylene molded body is formed from a blend of non-crosslinked olefin polymer rubber and polypropylene resin, and the blending ratio thereof is determined based on the non-crosslinked olefin weight. The blended rubber may be 10 to 90% by weight and the polypropylene resin 90 to 10% by weight, preferably 15 to 40% by weight of the non-crosslinked olefin polymer rubber and 85 to 60% by weight of the polypropylene resin. desirable. If the blending ratio of the non-crosslinked olefin polymer rubber and the polypropylene resin is within this range, the fusion layer 6a itself has sufficient strength, and the adhesiveness to the pallet 1 that is a polypropylene molded product is good. preferable.
[0017]
Examples of the non-crosslinked olefin polymer rubber forming the fusing layer 6a include binary copolymer such as ethylene-propylene copolymer rubber, ethylene-butene 1 copolymer rubber, and ethylene-pentene 1 copolymer rubber. An α-olefin copolymer such as a coalescence or terpolymer rubber such as ethylene-propylene-butene 1 can be used particularly preferably.
[0018]
The polypropylene resin for forming the fusion layer 6a is not particularly limited, but it is preferable to use a polypropylene resin having a melt index close to the melt index (MI) of the polypropylene resin used for the polypropylene molded body. This melt index value is preferably about 0.3 to 30 g / 10 min (230 ° C.), and in particular, a low crystalline type such as a propylene-ethylene random copolymer having no crystallinity in polypropylene resin or Amorphous polypropylene resin is preferred.
[0019]
On the other hand, the anti-slip layer 6b having anti-slip performance is formed from a blend of a non-crosslinked olefin polymer rubber and an ethylene vinyl acetate copolymer, and the blending ratio thereof is a non-crosslinked olefin. 10 to 90% by weight of the polymer rubber and 90 to 10% by weight of the ethylene monoacetate copolymer, preferably 10 to 30% by weight of the non-crosslinked olefin polymer rubber. The ethylene vinyl acetate copolymer is preferably 90 to 70% by weight.
[0020]
As the non-crosslinked olefin polymer rubber that forms the anti-slip layer 6b, any of the above-mentioned non-crosslinked olefin polymer rubbers that can be used as the material for forming the fusion layer 6a on the polypropylene molded body is preferably used. be able to. The ethylene monoacetate copolymer forming the anti-slip layer 6b is a copolymer of ethylene and vinyl acetate, and the vinyl acetate content is 5 to 35% by weight, preferably 10 to 25% by weight. %, And the melt flow index of the copolymer is 1 to 30 g / min (190 ° C.), preferably 2 to 10 g / min (190 ° C.).
[0021]
Next, a specific configuration of the anti-slip material 6 and means for fusing the fusion layer 6a of the anti-slip material 6 to the bottom surface 4a of the concave groove 4 formed on the deck surface 5 of the pallet 1 will be described.
[0022]
s1 is a pressing roller rotatably disposed on a suitable frame (not shown), and s2 is an eaves-shaped guide member as an example disposed near the pressing roller s1. s3 blows hot air to the bottom surface 4a of the groove 4 of the pallet 1 and the back surface 6c of the fusion layer 6a of the tape-shaped anti-slip material 6 so that the bottom surface 4a of the groove 4 of the pallet 1 and the anti-slip material 6 are fused. It is a hot-air injector that melts the back surface 6c of the layer 6a.
[0023]
The tape-shaped anti-slip material 6 has a substantially trapezoidal cross-sectional shape perpendicular to the longitudinal direction of the anti-slip material 6, and only the horizontal central portion 6 d ′ of the upper surface 6 d of the anti-slip material 6 is a pressing roller. The pressing roller s1 is configured not to come into contact with the inclined surface 6d ″ inclined downward in the direction of the side surface 6e from the horizontal central portion 6d ′ to which the pressing force of s1 is applied. When the fusion layer 6a of the anti-slip material 6 is fused to the bottom surface 4a of the recessed groove 4, the upper portion of the anti-slip material 6 is configured to protrude from the surface 1a of the pallet 1. The length in the direction perpendicular to the longitudinal direction of the tape-shaped anti-slip material 6, that is, the width of the tape-shaped anti-slip material 6 is formed narrower than the width of the concave groove 4 of the pallet 1. The fusion layer 6 a of the anti-slip material 6 is fused to the bottom surface 4 a of the recessed groove 4. It was the case, between the side surface 6e of the side surface 4b and the anti-slip material 6 to form a concave groove 4 of the pallet 1, and is configured such that a predetermined gap w is formed.
[0024]
While being guided by the guide member s2, the antislip material 6 is transferred in the direction of the clamping portion C of the antislip material 6 by the bottom surface 4a of the concave groove 4 of the pallet 1 and the pressing roller s1 being conveyed by a pallet conveying device (not shown). Is done. And hot air (for example, hot air of 600-800 degreeC) is sprayed by the hot air sprayer s3 on the back surface 6c of the fusion | melting layer 6a of the slip prevention material 6 which protruded from the guide member s2, and the bottom face 4a of the ditch | groove 4 of the pallet 1. Then, the bottom surface 4a of the concave groove 4 of the pallet 1 and the back surface 6c of the fusion layer 6a of the anti-slip material 6 are melted, and the anti-slip material 6 is pressed against the bottom surface 4a of the concave groove 4 of the pallet 1 by the pressing roller s1. Thus, the anti-slip material 6 is welded to the pallet 1 being conveyed by the pallet conveying device. As described above, the antislip material 6 is preferably fused to the pallet 1 by melting both the bottom surface 4a of the groove 4 of the pallet 1 and the back surface 6c of the adhesion layer 6a of the antislip material 6. However, it can also be performed by melting one of the bottom surface 4a of the concave groove 4 of the pallet 1 and the back surface 6c of the fusion bonding layer 6a of the anti-slip material 6.
[0025]
The melted resin existing between the back surface 6c of the fusion layer 6a located below the central portion 6d 'of the anti-slip material 6 that receives the pressing force of the pressing roller s1 and the bottom surface 4a of the concave groove 4 of the pallet 1 is pressed. Although it flows in the direction of the side surface 6e of the anti-slip material 6 due to the pressing force of the roller s1, the inclined surface 6d "of the upper surface 6d of the anti-slip material 6 is not subjected to the pressing force of the pressing roller s1, and therefore below the inclined surface 6d". The melted resin existing between the back surface 6c of the fusion layer 6a located at the bottom and the bottom surface 4a of the concave groove 4 of the pallet 1 is formed between the bottom surface 4a of the concave groove 4 of the pallet 1 and the fusion layer 6a of the antislip material 6. Ejection from between the back surface 6c is suppressed. In this way, the melted resin existing between the back surface 6c of the fusion layer 6a located below the horizontal central portion 6d ′ of the anti-slip material 6 and the bottom surface 4a of the concave groove 4 of the pallet 1 The back surface 6c of the fusion layer 6a and the pallet located below the inclined surface 6d "of the anti-slip material 6 without being discharged from between the bottom surface 4a of the groove 4 and the back surface 6c of the fusion layer 6a of the anti-slip material 6. Therefore, more melted between the bottom surface 4a of the groove 4 of the pallet 1 and the back surface 6c of the fusion layer 6a of the antislip material 6. Resin is present, and the anti-slip material 6 is firmly attached to the bottom surface 4a of the concave groove 4 of the pallet 1, and the anti-slip material 6 is peeled from the bottom surface 4a of the concave groove 4 of the pallet 1. Can be prevented.
[0026]
Note that the corrugated surface forming the boundary surface B between the upper surface of the fusion layer 6a and the lower surface of the anti-slip layer 6b is not limited to the literal waveform shown in FIG. The boundary surface B between the wearing layer and the anti-slip layer means a curved boundary surface B such as an uneven boundary surface B or a semicircular boundary surface B that forms a boundary surface B larger than the plane.
[0027]
Further, the above-described embodiment shows an example in which the anti-slip material 6 having the two-layer structure of the fusion layer 6a and the anti-slip layer 6b is fused to the concave groove 4 formed on the deck surface 5 of the pallet 1. However, the anti-slip material 6 can be fused to the surface 1 a of the pallet 1, that is, the deck surface 5 without forming the concave groove 4 in the pallet 1.
[0028]
Next, the peel test will be described.
[0029]
70% by weight of polypropylene resin (Grand Polypro, J702LB, manufactured by Grand Polymer Co., Ltd., MI = 1.8 g / 10 min) and non-crosslinked olefin polymer rubber (Tuffmer, P-0680, manufactured by Mitsui Chemicals, Inc.) And a non-crosslinked olefin polymer rubber in 90% by weight of a fusion layer 6a containing 30% by weight of an ethylene vinyl acetate copolymer (Evaflex, P-1905, manufactured by Mitsui DuPont Polychemical Co., Ltd.) An anti-slip material 6 was obtained by extrusion-molding a tape-shaped laminated anti-slip material composed of an anti-slip layer 6b containing 10% by weight (Tuffmer, P-0680, manufactured by Mitsui Chemicals, Inc.).
[0030]
The size of the vertical cross section perpendicular to the length direction of the anti-slip material 6 is shown in FIG. The unit is millimeter (mm), and R represents a radius of curvature. The anti-slip material 6 has a width of 20 mm and a thickness of 2.7 mm. The boundary surface B is formed in a corrugated shape having a curvature radius R = 0.25 mm, the interval between the corrugated crest and trough is 0.4 mm, and the height of the crest 6a ″ of the fusion layer 6a is Further, the curvature radius R of the left and right corners of the anti-slip material 6 is 1.5 mm, and the width of the horizontal central portion 6d ′ of the upper surface 6d is 8 mm, which is inclined with respect to the central portion 6d ′. The radius of curvature R of the portion existing between the surface 6d "is 10 mm. The height of the intersection between the extended line of the inclined surface 6d ″ and the extended line of the side surface 6e is 2 mm.
[0031]
The peel test method is shown in FIG. First, a part of the fusion layer 6a is peeled from the anti-slip layer 6b along the longitudinal direction of the tape-shaped anti-slip material to obtain a test piece E. Next, the end portion of the anti-slip layer 6b from which a part of the fusion layer 6a is peeled off and the portion where the fusion layer 6a is not peeled off from the anti-slip layer 6b are fixed (fixed portions are inverted triangles e1 and e2). It is shown.). A spring balance e4 is attached to the end of the fusion layer 6a peeled off from the anti-slip layer 6b via a clamping tool e3. From this state, the scale of the spring balance e4 is read when the fusion layer 6a is pulled in a horizontal state while being pulled at a speed of 500 mm / min and the fusion layer 6a starts to peel from the anti-slip layer 6b. This value was defined as peel strength (unit: Newton: N).
[0032]
The anti-slip material 6 molded as described above was randomly extracted for each production lot and tested five times per lot. As a result, the maximum peel strength was 107N. The average peel strength was 102N.
[0033]
When a conventional anti-slip material having a boundary surface B having a horizontal surface was molded with the same composition as the above-described test piece and subjected to the above-described peel test, the average value of the peel strength was 41N.
[0034]
As described above, by forming the boundary surface B into a corrugated shape, the peel strength is increased by 2.5 times compared to a conventional anti-slip material in which the boundary surface B is a horizontal surface.
[0035]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained.
[0036]
Since the boundary surface between the upper surface of the anti-slip material and the lower surface of the anti-slip layer is curved, the interface between the anti-slip material and the anti-slip layer has a flat surface. The area of the boundary surface between the adhesion layer and the anti-slip layer can be increased, and therefore, the anti-slip layer is hardly peeled off from the fusion layer.
[Brief description of the drawings]
FIG. 1 is a perspective view of a pallet as an example of a polypropylene molded product having anti-slip performance to which an anti-slip material of the present invention is applied.
FIG. 2 is a vertical cross-sectional view in the width direction of a groove formed in a pallet as an example of a polypropylene molded product having an anti-slip performance to which the anti-slip material of the present invention is applied.
FIG. 3 is a vertical sectional view in the width direction of the anti-slip material of the present invention.
4 is a vertical sectional view taken along line II in FIG. 1. FIG.
FIG. 5 is a perspective view of a main part of a fusing apparatus for fusing the anti-slip material of the present invention to a pallet as an example of a polypropylene molded product.
FIG. 6 is a side view of a main part of a fusion apparatus for fusing the anti-slip material of the present invention to a pallet as an example of a polypropylene molded product.
FIG. 7 is a vertical cross-sectional view perpendicular to the longitudinal direction of the anti-slip material showing the dimensions of the anti-slip material used in the peel test.
FIG. 8 is a schematic front view of a peel test apparatus for explaining a peel test method.
[Explanation of symbols]
B ... Boundary surface 1 ... Pallet 4 ... Groove 6 ... Anti-slip material 6a ...・ ・ ・ ・ ・ ・ Fusion layer 6b ・ ・ ・ ・ ・ ・ ・ ・ Slip prevention layer

Claims (1)

In the anti-slip material having a two-layer structure of the fusion layer and the anti-slip layer, the corrugated surface formed on the upper surface of the fusion layer and the corrugated surface formed on the lower surface of the anti-slip layer are in close contact with each other, and are fused. The interface between the corrugated surface formed on the upper surface of the layer and the corrugated surface formed on the lower surface of the anti-slip layer is configured so that no space is formed, and is perpendicular to the longitudinal direction of the anti-slip material. The cross section is formed in a substantially trapezoidal shape, and the pressing force of the pressing roller is applied only to the horizontal central portion of the top surface of the anti-slip material, and the inclined surface is inclined downward in the lateral direction from the horizontal central portion. The anti-slip material is configured so that the pressing roller does not come into contact therewith .

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