JPH0858829A - Separate sheet superior in mar resistance - Google Patents

Abstract

PURPOSE: To obtain a separate sheet that is hardly marred or inconspicuously marred, superior in sucking workability, free from a possibility that a load may fall in, and extended in service life. CONSTITUTION: In a plastic separate sheet composed mainly of a thermoplastic resin, a glossiness Ae on one or both surfaces is 20% <=Ae<=60%, an embossed shape on the surface meet requirements of 0.2<= the total area of projected part 1 the total area of recessed part <=2, and 10μm<= the ridge height of projected part <=100μm, and a superior mar resistance is imparted.

Description

Detailed Description of the Invention

[0001]

[Field of Industrial Application] The present invention is used for bulk transportation of containers such as metal cans, plastic bottles, and glass bottles, and is less likely to be damaged, scratches are less noticeable, suction workability is excellent, load is not collapsed, and service life is improved. It concerns long separate sheets.

[0002]

2. Description of the Related Art In the distribution of containers such as metal cans, plastic bottles, and glass bottles, it has been done for a long time to handle these containers in a state of being housed in a carton, a wooden box, a plastic case, or the like. Bulk packing has come to be performed from the standpoint of mechanization or automation of cargo handling work such as packaging and transportation.

In bulk packaging, typically, one separate sheet is first placed on a pallet, and then the first-stage containers are arranged in an upright posture from above (loading surface),
Next, after placing the second separate sheet on it, the second-stage containers are aligned and arranged in a standing posture, and after repeating such an operation a total of n times, the second-stage containers are further placed on the n-th container. This method refers to a method in which a separate sheet is placed and then the top frame is placed, and then the whole including the pallet and the top frame is banded with several bands, and the whole is wrapped with a wrapping film such as shurik film or stretch film. Since bulk packaging is often adopted when a container is transported from its manufacturing factory to a filling factory, the container is often handled in an open state.

Conventionally, paperboard has been mainly used as a separate sheet for use in such bulk packaging, but it cannot be washed and cannot be repeatedly used.
When it is repeatedly used, the surface is abraded and fluffed, and further, fiber dust of paper is generated, so that it has a drawback that the number of times of use is small. Therefore, when it is transported from the manufacturing plant to the filling plant, it is unavoidable that paper fiber scraps get mixed into the container with the lid open, which may cause trouble at a later date. It was

Therefore, it is considered that the separate sheet is made of plastic instead of paperboard. It is considered that plastic has a good molding precision and can be washed, and thus can be used repeatedly, which increases the number of uses, the amount of waste, and the running cost.Therefore, many ideas have already been devised as a plastic separate sheet. There is.

[0006]

However, in the case of a plastic sheet, which is superior to the paperboard in terms of scratch resistance, compared to the paperboard, the plastic separate sheet is apt to be conspicuous when scratched and has a problem in repeated use. there were.

As a result of keen examination by the present inventors in order to solve the above conventional problems, as a result, the surface of the separate sheet is provided with glossiness and the surface shape is limited, so that the scratch resistance ( It has become possible to provide a plastic separate sheet which has excellent wear resistance) and has a long service life.

[0008]

Means for Solving the Problems A separate sheet of the present application has the following configuration. In a plastic separate sheet containing a thermoplastic resin as a main component, the glossiness Ae on one side or both sides is in the range of 20% ≦ Ae ≦ 60%,
In addition, the embossed shape is (a) 0.2≤S1 / S2≤2 (b) 10μ≤h≤100μ (where S1 is the total area of the convex portions on the surface of the separate sheet S2 is the total area of the concave portions on the surface of the separate sheet). Area h: height of peaks of protrusions on the surface of the separate sheet), which is a separate sheet having excellent scratch resistance.

The present invention will be described in detail below. Examples of the thermoplastic resin for the separate sheet used in the present invention include polyolefin resins such as polyethylene, polypropylene, ethylene / vinyl acetate copolymer, ethylene / ethyl acrylate copolymer; polystyrene,
Acrylonitrile-butadiene-styrene copolymer, acrylonitrile-styrene copolymer and other styrene resins; polymethylmethacrylate and other acrylic resins; 6-nylon, 66-nylon, 12-nylon, 6 / 12-nylon, etc. Polyamide-based resins; polyester-based resins such as polyethylene terephthalate and polybutylene terephthalate; single-body sheets made of polyvinyl chloride, polycarbonate, polyphenylene oxide and mixtures thereof, foam sheets, laminated sheets and the like.

These thermoplastic resin sheets include heat resistance stabilizers, weather resistance stabilizers, plasticizers, lubricants, slip agents, antibacterial agents, antifungal agents, antistatic agents, charge transfer polymers, nucleating agents, flame retardants, pigments. , Dyes, inorganic fillers, organic fillers and the like can be added according to the purpose.

Further, the thermoplastic resin sheet may be provided with conductivity for the purpose of avoiding adhesion of dirt due to static electricity and adhesion (blocking) trouble between the sheets. As the sheet imparted with the conductive property, carbon black, metal particles, metal or metal oxide coated particles, carbon fiber, stainless steel fiber, metal or metal oxide coated fiber, etc. as a single body sheet, foam sheet Alternatively, a laminated sheet may be used, or a conductive non-woven fabric or conductive material obtained from conductive fibers such as carbon fibers, stainless steel fibers, copper compound-coated synthetic fibers, carbon black-containing synthetic fibers, carbon black-containing composite synthetic fibers, etc. A knitted / woven fabric may be fused and integrated on the surface of the thermoplastic resin sheet.

The embossed shape of the separate sheet of the present invention can be selected in various ways, and FIGS. 1 to 4 are perspective partial cross-sectional views of examples of the embossed shape. FIG. 1 shows an example of a halftone dot shape, and FIG.
Shows an example of a lattice shape, FIG. 3 shows an example of a mesh shape, and FIG. 4 shows an example of an irregular mountain shape. 1 and 2, the shape of the convex plane is quadrangular, but the shape of the convex plane is circular, elliptical, triangular, pentagonal, hexagonal, L-shaped, T-shaped, ring-shaped, I shape, I shape with different direction,
Alternatively, a combination of these may be used. Although FIG. 1, FIG. 2, and FIG. 3 are orthogonal, they may be oblique.

The glossiness Ae of one or both sides of the separate sheet of the present invention is in the range of 20% ≦ Ae ≦ 60%. The embossed shape is (a) 0.2 ≦ S1 / S2 ≦ 2 (b) 10μ ≦ h ≦ 100μ (where S1 is the total area of the convex portions on the surface of the separate sheet S2 is the total area of the concave portions on the surface of the separate sheet. Area h; height of peaks of protrusions on the surface of the separate sheet).

The ratio (S1 / S) of the total area of the convex portions (S1) and the total area of the concave portions (S2) on the surface of the separate sheet.
If the value of 2) is less than 0.2, the container may fall over in the palletizing and depalletizing steps of bulk packaging, which may cause the load to collapse. If S1 / S2 exceeds 2,
The surface of the separate sheet is easily scratched, and the scratches are easily noticeable.

The height of the peaks of the protrusions is preferably about 20 to 50 μm, and when the height is less than 10 μm, the scratches are apt to stand out, and when it exceeds 100 μm, a decrease in the mechanical strength of the sheet itself cannot be ignored, and the bulk is bulky. In the palletizing and depalletizing steps of packaging, the suction cup does not suck the product, which causes line troubles.

Furthermore, even if the height h of the peak of the convex portion is 10 μm
Even if it is 100 μm or less, when the surface glossiness specified in JIS Z 8741 is less than 20%, scratches are easily noticeable, and giving a glossiness of more than 60% means that in the case of an embossed shape, Very difficult industrially. Further, in order to adjust the glossiness Ae to the range, the embossing roll at the time of forming the sheet can be made to have any glossiness by polishing or plating finish.

As described above, the separate sheet of the present invention is characterized in that the damage rate is minimized by specifying the gloss ratio and the surface shape, and even if it is damaged, it becomes inconspicuous. .

[0022]

EXAMPLES Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples, but the present invention is not limited thereto. Further, the surface condition (glossiness, surface roughness) of the separate sheet was measured by the following method, and the performance evaluation of the separate sheet (damage resistance, load collapse, presence of suction cup suction trouble) was performed. 1) Gloss Using a digital variable angle gloss meter (manufactured by Suga Test Instruments Co., Ltd.), J
In accordance with IS Z 8741, acceptance angle 60 ° incidence angle 6
The measurement was performed under the condition of 0 °. 3) Damage resistance Using the Amsler type abrasion tester, the surface of the separate sheet was reciprocally worn 300, 1500 and 4500 times at the bottom of a 250 ml steel can, and the damage state of the surface of the separate sheet was observed. Evaluation criteria: ◎ = Not noticeable ○ = Not noticeable △ = Slightly noticeable × = Conspicuous 4) Presence or absence of load collapse / sucker suction trouble Presence / absence of load collapse by carrying out palletizing and depalletizing processes on the actual bulk packaging line And the presence or absence of suction trouble was observed.

Example 1 A polypropylene resin having a melt flow rate (MFR) of 3.6 g / 10 min (K7014 manufactured by Chisso Corporation) was melt-kneaded at a temperature of 240 ° C. with an extruder having a diameter of 120 mm, and a width of 1800 mm. Extruded into a sheet from the T-die of
Cooling roll temperature: 80 ° C., take-up speed: 2 m / min under sheet forming conditions, insert between embossing rolls, and total surface area of convex parts (S1) with surface shape as shown in FIG. 1 on both sides.
And the total area of the recesses (S2) ratio (S1 / S2) is 0.8, the height (h) of the peaks of the protrusions is 30μ, and the glossiness (Ae) of the surface is 35% of thickness 1.5mm I got a separate sheet. The total area (S1) of the convex portions was obtained by taking a 30 times micrograph of arbitrary 10 areas on the separate sheet, obtaining the total area (S1) of the convex areas in 10 cm ² , and calculating the average of the 10 areas. . The total area of the concave portions (S2) was calculated by subtracting the total area of the convex portions (S1) from 10 cm ² . The calculated S
From 1, S2, the total area of the convex part (S1) and the total area of the concave part (S2)
The ratio (S1 / S2) was calculated.

Example 2 A polypropylene resin having a melt flow rate (MFR) of 3.6 g / 10 min (K7014 manufactured by Chisso Corporation) was melt-kneaded at a temperature of 240 ° C. with an extruder having a diameter of 120 mm, and a width of 1800 mm. Extruded into a sheet from the T-die of
Cooling roll temperature: 80 ° C., take-up speed: 2 m / min under sheet forming conditions, insert between embossing rolls, and total surface area of convex parts (S1) with surface shape as shown in FIG. 1 on both sides.
And the total area of the recesses (S2) (S1 / S2) is 0.3, the height (h) of the peaks of the protrusions is 15μ, and the surface glossiness (Ae) is 20%. I got a separate sheet.

Example 3 A polypropylene resin (K7014 manufactured by Chisso Corporation) having a melt flow rate (MFR) of 3.6 g / 10 min was melt-kneaded at a temperature of 240 ° C. with an extruder having a diameter of 120 mm, and a width of 1800 mm. Extruded into a sheet from the T-die of
Cooling roll temperature: 80 ° C., take-up speed: 2 m / min under sheet forming conditions, insert between embossing rolls, and total surface area of convex parts (S1) with surface shape as shown in FIG. 1 on both sides.
And the total area of the concave portions (S2) (S1 / S2) is 1.8, the height (h) of the peaks of the convex portions is 80μ, and the glossiness (Ae) of the surface is 55% of a thickness of 1.5 mm I got a separate sheet.

Example 4 A polypropylene resin having a melt flow rate (MFR) of 3.6 g / 10 min (K7014 manufactured by Chisso Corporation) was melt-kneaded at a temperature of 240 ° C. with an extruder having a diameter of 120 mm, and a width of 1800 mm. Extruded into a sheet from the T-die of
Cooling roll temperature: 80 ° C., take-up speed: 2 m / min under sheet forming conditions, insert between embossing rolls, and total surface area of convex part with surface shape as shown in FIG. 2 on both sides (S1)
And the total area (S2) of the concave portion (S1 / S2) is 1.2, the height (h) of the peak of the convex portion is 25μ, and the glossiness (Ae) of the surface is 25% of thickness 1.5mm I got a separate sheet.

Example 5 A polypropylene resin having a melt flow rate (MFR) of 3.6 g / 10 min (K7014 manufactured by Chisso Corporation) was melt-kneaded at a temperature of 240 ° C. with an extruder having a diameter of 120 mm, and a width of 1800 mm. Extruded into a sheet from the T-die of
Cooling roll temperature: 80 ° C., take-up speed: 2 m / min under sheet forming conditions, insert between embossing rolls, and total surface area of convex part with surface shape as shown in FIG. 2 on both sides (S1)
And the total area (S2) of the recesses is 0.5 (S1 / S2), the height (h) of the peaks of the protrusions is 90μ, and the glossiness (Ae) of the surface is 25%, the thickness is 1.5 mm. I got a separate sheet.

Example 6 A polypropylene resin having a melt flow rate (MFR) of 3.6 g / 10 min (K7014 manufactured by Chisso Corporation) was melt-kneaded at a temperature of 240 ° C. with an extruder having a diameter of 120 mm, and a width of 1800 mm. Extruded into a sheet from the T-die of
Cooling roll temperature: 80 ° C., take-up speed: 2 m / min under sheet forming conditions, insert between embossing rolls, and total surface area of convex parts (S1) with surface shape as shown in FIG.
And the total area of the concave portions (S2) (S1 / S2) is 0.2, the height (h) of the convex peaks is 45μ, and the glossiness (Ae) of the surface is 30% of a thickness of 1.5 mm. I got a separate sheet.

Example 7 A polypropylene resin having a melt flow rate (MFR) = 3.6 g / 10 min (K7014 manufactured by Chisso Corporation) was melt-kneaded at a temperature of 240 ° C. with an extruder having a diameter of 120 mm, and a width of 1800 mm. Extruded into a sheet from the T-die of
Cooling roll temperature: 80 ° C., take-up speed: 2 m / min under sheet forming conditions, insert between embossing rolls, and total surface area of convex parts (S1) with surface shape as shown in FIG.
And the total area of the recesses (S2) ratio (S1 / S2) is 1.0, the height (h) of the peaks of the protrusions is 35μ, and the glossiness (Ae) of the surface is 40%. I got a separate sheet.

Example 8 A polypropylene resin having a melt flow rate (MFR) of 3.6 g / 10 min (K7014 manufactured by Chisso Corporation) was melt-kneaded at a temperature of 240 ° C. with an extruder having a diameter of 120 mm, and a width of 1800 mm. Extruded into a sheet from the T-die of
Cooling roll temperature: 80 ° C., take-up speed: 2 m / min, under sheet forming conditions, insert between embossing rolls, and total surface area of convex parts with surface shape as shown in FIG. 4 on both sides (S1)
And the total area of the concave portions (S2) (S1 / S2) is 0.6, the height of the convex peaks (h) is 20μ, and the glossiness (Ae) of the surface is 50%. I got a separate sheet.

Example 9 A polypropylene resin having a melt flow rate (MFR) of 3.6 g / 10 min (K7014 manufactured by Chisso Corporation) was melt-kneaded at a temperature of 240 ° C. with an extruder having a diameter of 120 mm, and a width of 1800 mm. Extruded into a sheet from the T-die of
Cooling roll temperature: 80 ° C., take-up speed: 2 m / min, under sheet forming conditions, insert between embossing rolls, and total surface area of convex parts with surface shape as shown in FIG. 4 on both sides (S1)
And the total area of the recesses (S2) (S1 / S2) is 1.5, the height (h) of the peaks of the protrusions is 40μ, and the surface glossiness (Ae) is 25% and the thickness is 1.5 mm. I got a separate sheet.

Comparative Example 1 A polypropylene resin having a melt flow rate (MFR) of 3.6 g / 10 min (K7014 manufactured by Chisso Corporation) was melt-kneaded at a temperature of 240 ° C. with an extruder having a diameter of 120 mm, and a width of 1800 mm. Extruded into a sheet from the T-die of
Cooling roll temperature: 80 ° C., take-up speed: 2 m / min under sheet forming conditions, insert between embossing rolls, and total surface area of convex parts (S1) with surface shape as shown in FIG. 1 on both sides.
And the total area of the recesses (S2) (S1 / S2) is 2.8, the height (h) of the peaks of the protrusions is 35μ, and the glossiness (Ae) of the surface is 25%. I got a separate sheet.

Comparative Example 2 A polypropylene resin having a melt flow rate (MFR) of 3.6 g / 10 min (K7014 manufactured by Chisso Corporation) was melt-kneaded at a temperature of 240 ° C. with an extruder having a diameter of 120 mm, and a width of 1800 mm. Extruded into a sheet from the T-die of
Cooling roll temperature: 80 ° C., take-up speed: 2 m / min under sheet forming conditions, insert between embossing rolls, and total surface area of convex parts (S1) with surface shape as shown in FIG. 1 on both sides.
And the total area of the concave portions (S2) (S1 / S2) is 0.1, the height (h) of the convex peaks is 45μ, and the surface glossiness (Ae) is 8% and the thickness is 1.5 mm. I got a separate sheet.

Comparative Example 3 A polypropylene resin having a melt flow rate (MFR) of 3.6 g / 10 min (K7014 manufactured by Chisso Corporation) was melt-kneaded at a temperature of 240 ° C. with an extruder having a diameter of 120 mm, and a width of 1800 mm. Extruded into a sheet from the T-die of
Cooling roll temperature: 80 ° C., take-up speed: 2 m / min under sheet forming conditions, insert between embossing rolls, and total surface area of convex part with surface shape as shown in FIG. 2 on both sides (S1)
The ratio (S1 / S2) of the total area (S2) of the concave portion to 1.8, the height (h) of the peak of the convex portion is 5μ, and the glossiness (Ae) of the surface is 1
A separate sheet having a thickness of 0% and a thickness of 1.5 mm was obtained.

Comparative Example 4 A polypropylene resin having a melt flow rate (MFR) of 3.6 g / 10 min (K7014 manufactured by Chisso Corporation) was melt-kneaded at a temperature of 240 ° C. with an extruder having a diameter of 120 mm, and a width of 1800 mm. Extruded into a sheet from the T-die of
Cooling roll temperature: 80 ° C., take-up speed: 2 m / min under sheet forming conditions, insert between embossing rolls, and total surface area of convex part with surface shape as shown in FIG. 2 on both sides (S1)
And the total area (S.2) of the recesses (S1 / S2) is 3.5,
Height of convex peak (h) is 150μ, gloss of surface (A
A 1.5 mm-thick separate sheet having 15% of e) was obtained.

Comparative Example 5 A polypropylene resin having a melt flow rate (MFR) of 3.6 g / 10 min (K7014 manufactured by Chisso Corporation) was melt-kneaded at a temperature of 240 ° C. with an extruder having a diameter of 120 mm, and a width of 1800 mm. Extruded into a sheet from the T-die of
Cooling roll temperature: 80 ° C., take-up speed: 2 m / min under sheet forming conditions, insert between embossing rolls, and total surface area of convex parts (S1) with surface shape as shown in FIG.
And the total area of the recesses (S.2) (S1 / S2) is 0.0
5, height of convex peak (h) is 8μ, gloss of surface (A
A separate sheet having a thickness of 1.5 mm and having an e) of 30% was obtained.

Comparative Example 6 A polypropylene resin having a melt flow rate (MFR) of 3.6 g / 10 min (K7014 manufactured by Chisso Corporation) was melt-kneaded at a temperature of 240 ° C. with an extruder having a diameter of 120 mm, and a width of 1800 mm. Extruded into a sheet from the T-die of
Cooling roll temperature: 80 ° C., take-up speed: 2 m / min under sheet forming conditions, insert between embossing rolls, and total surface area of convex parts (S1) with surface shape as shown in FIG.
And the ratio (S1 / S2) of the total area of the recess (S.2) is 3.0,
A 1.5 mm-thick separate sheet having a convex height (h) of 7 μ and a surface glossiness (Ae) of 10% was obtained.

Comparative Example 7 A polypropylene resin having a melt flow rate (MFR) of 3.6 g / 10 min (K7014 manufactured by Chisso Corporation) was melt-kneaded at a temperature of 240 ° C. with an extruder having a diameter of 120 mm, and a width of 1800 mm. Extruded into a sheet from the T-die of
Cooling roll temperature: 80 ° C., take-up speed: 2 m / min, under sheet forming conditions, insert between embossing rolls, and total surface area of convex parts with surface shape as shown in FIG. 4 on both sides (S1)
And the total area of the recesses (S.2) (S1 / S2) is 5.5,
A 1.5 mm-thick separate sheet having a convex peak height (h) of 3 μm and a surface glossiness (Ae) of 5% was obtained.

Comparative Example 8 A polypropylene resin having a melt flow rate (MFR) of 3.6 g / 10 min (K7014 manufactured by Chisso Corporation) was melt-kneaded at a temperature of 240 ° C. with an extruder having a diameter of 120 mm, and a width of 1800 mm. Extruded into a sheet from the T-die of
Cooling roll temperature: 80 ° C., take-up speed: 2 m / min, under sheet forming conditions, insert between embossing rolls, and total surface area of convex parts with surface shape as shown in FIG. 4 on both sides (S1)
And the total area (S.2) of the recesses (S1 / S2) is 0.1,
Height of convex peak (h) is 180μ, surface gloss (A
A 1.5 mm-thick separate sheet having 25% of e) was obtained.

[0048]

EFFECTS OF THE INVENTION The separate sheet of the present invention contains a thermoplastic resin as a main component, has a specified glossiness on one side or both sides, and is embossed to make it difficult to receive scratches and scratches are less noticeable. In addition, it was possible to supply a separate sheet which has excellent suction workability, does not collapse, and has a long service life.

[0049]

[Table 1]

[Table 2]

[Brief description of drawings]

FIG. 1 is a perspective partial cross-sectional view of a separate sheet enlarged embossed shape example of the present invention.

FIG. 2 is a perspective partial cross-sectional view of a separate sheet enlarged embossed shape example of the present invention.

FIG. 3 is a perspective partial cross-sectional view of a separate sheet enlarged embossed shape example of the present invention.

FIG. 4 is a perspective partial cross-sectional view of a separate sheet enlarged embossed shape example of the present invention.

Claims (1)

[Claims] 1. In a plastics separate sheet containing a thermoplastic resin as a main component, the glossiness Ae of one side or both sides is in the range of 20% ≦ Ae ≦ 60%, and the embossed shape of the surface is ( a) 0.2 ≦ S1 / S2 ≦ 2 (b) 10μ ≦ h ≦ 100μ (however, S1; total area of convex portions on the surface of the separate sheet S2; total area of concave portions on the surface of the separate sheet h; convex on the surface of the separate sheet Separate sheet with excellent scratch resistance in the range of (mountain height).