JPH0516962A - Tear sheet and its production - Google Patents

Abstract

PURPOSE:To increase safety and efficiency of operation, by providing the first area having the first frictional resistance at one face and the second area having the smaller second frictional resistance than the first frictional resistance. CONSTITUTION:The first area 2 having the first frictional resistance may have basically a larger friction resistance than the second area 3 having the second friction resistance. The forms and the superficial conditions are not especially limited. For instance, the first area 2 is made to be a smooth plane mirror face) or the second area 3 is made to be a rough face by means of an embossing treatment like sattin finished surface, finely uneven surface, etc. Further, the difference of the frictional resistance between the first area 2 and the second area 3 can be made by laminating an anti-sliding member like a tape, rubber, etc., on the first area 2. In this way, it is made easy to facilitate palletizing or depalletizing and a container is prevented from sliding down during transferring and transporting and the safety and efficiency of operation is increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tear sheet used for transporting containers. More specifically, the tear sheet of the present invention includes two types of a first area having a first frictional resistance on one surface of the sheet and a second area having a second frictional resistance smaller than the first area. A region having different frictional resistances, and particularly preferably at least a peripheral portion of the tear sheet having a large frictional resistance.
It is characterized in that a region is provided.

This tear sheet facilitates palletizing or depalletizing of a container, and transporting / depalletizing the container.
It is possible to prevent the container from slipping off during transportation, thereby improving work safety and efficiency. Generally, the palletizing work in the tear sheet is as follows: (1) Arranging a predetermined number of canned unfilled containers on a conveyor, pushing them and arranging them on a tear sheet, and sequentially stacking them. Unitizing step, (2) banding the unitized cargo in a stacked state with a polypropylene band, etc. (3) shrink-wrapping the banded unit, (4) shrink-wrapping It includes a step of storing the unit or transporting it by a forklift, etc., and (5) a step of transporting it by a truck or the like. In addition, depalletizing is a process that is the reverse of palletizing. (1) Unpacking the transported shrink wrapping unit, (2) Unpacking, (3) Stacking the units. It includes a step of sequentially arranging and pushing a predetermined number of sheets one by one on a conveyor and transporting them to a filling step and the like.

[0003]

2. Description of the Related Art In recent years, metal containers made of aluminum or steel used for soft drinks, beer, edible oil, canned foods, etc., glass containers used for pharmaceuticals, industrial chemicals, liquid seasonings, etc., or liquid detergents, seasonings. A large variety of various containers are used in many fields, such as plastic containers used for ice cream and the like. Further, most of the cargo handling work such as packing and transportation of these containers is mechanized or automated. Unit loading is one of the modes of packing and transporting these containers. This method is a method in which when a container or the like is loaded and transported, they are put together in an appropriate number or weight to form one unit, and they are integrally loaded and handled by the device without breaking down in the middle. That is, a fixed number of containers are stacked on a pallet in a large number of rows and a large number of stages to form a unit, which is then subjected to shrink wrapping, banding, etc., for use in cargo handling work. At this time, when cleaning, sterilizing, and transporting unfilled containers, when stacking the containers in multiple stages to form a unit, the purpose is to stabilize the containers, prevent load collapse, and prevent contamination and dust due to various bacteria. Then, insert a fiberboard or plastic sheet in each step. The sheet material to be inserted between the stages during this stacking is a tear sheet.

As a performance of such a tear sheet (hereinafter sometimes simply referred to as "sheet"), the container is placed on the tear sheet at the time of palletizing or depalletizing or when cleaning and sterilizing an unfilled container. In order to slip and feed, it is necessary for the container to be slippery.
On the other hand, when the unit load is conveyed or conveyed by a conveyor, a forklift, a vehicle, etc., it is necessary that the container does not slip off. Therefore, the tear sheet is required to have opposite properties of slipperiness and slipperiness.

As a conventional tear sheet, a paper board has been used. However, since mechanical strength such as bending rigidity and impact resistance decreases due to water absorption and moisture absorption, it cannot be repeatedly used and is durable. There are restrictions from the aspect of sex. Further, when used in an unfilled container, if the tear sheet is made of paper, it causes fuzz and tends to have various bacteria and dust. In addition, washing with water or hot water treatment is impossible, while sterilization treatment such as washing with an air shower or brushing, flame treatment, heat roll treatment, etc., cannot provide sufficient sterilization and dust prevention. Therefore, when palletizing or transporting an unfilled container, it is inevitable that these contaminants will be mixed in the container, and there were many problems particularly in the use of a paper tear sheet in the fields of food and pharmaceuticals. .

As a means for solving the above problems of paper tear sheets, 2 to 10% ethylene and 90 to 98 are used.
A plastic tear sheet consisting of a random copolymer of 100% propylene has been proposed (International Publication
WO 82/01861). However, a conventional plastic tear sheet may be one in which one side of the sheet is a smooth surface (mirror surface), or one side of the sheet is a mirror surface and the other side is a rough surface. is there. When the container is placed on the rough surface, the coefficient of friction between the sheet and the container is small, so that the container is slippery, and the container may slide down during transportation. As a method for preventing such slipping of the container, JP-A-50-136189 and JP-A-5-136189.
The method described in 0-143686 is proposed. On the other hand, if a container is placed on a smooth surface of the tear sheet, especially a sheet with a mirror-finished surface, the coefficient of friction between the container and the tear sheet is large, so the tear sheet is used when the palletizer or depalletizer supplies or discharges. There is a problem that the container is dragged and dragged, the container falls, and the handling work becomes difficult.

[0007]

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned problems in the prior art.
That is, an object of the present invention is to facilitate palletizing or depalletizing of a container, prevent slipping of the container during transportation or transportation, and improve work safety and efficiency. Other purposes are excellent in mechanical strength, heat resistance, antistatic properties, etc., and when used in unfilled containers,
It is an object of the present invention to provide a tear sheet capable of effectively performing water washing, sterilization treatment and the like on the sheet.

[0008]

In order to solve the above problems, the inventors of the present invention have made earnest studies on a tear sheet, and have conducted various experiments to arrive at the present invention. That is, the first invention of the present application is a tier in which a first region having a first frictional resistance and a second region having a second frictional resistance smaller than the first frictional resistance are provided on one surface. It is about the seat. According to another invention of the present application, a sheet feeding means for feeding a predetermined tear sheet, a first region having a first frictional resistance on this sheet, and a second region having a frictional resistance smaller than the first frictional resistance. The present invention relates to a tear sheet manufacturing method, comprising: a shaping means for shaping the second region having frictional resistance; and a cutting means for cutting the shaping sheet.

The present invention will be described in more detail below with reference to the drawings. FIG. 1 is a plan view of an embodiment of the tear sheet of the present invention. The tear sheet 1 is a first flat surface (mirror surface).
The first area 2 having a frictional resistance of 1 is provided in the peripheral portion, and the second area 3 having a second frictional resistance, which is made of a rough surface and has a smaller frictional resistance than the first area, is provided on the inner side of the sheet. It is a thing. The first region 2 having the first frictional resistance
Is basically required to have a frictional resistance larger than that of the second region 3 having the second frictional resistance, and the shape, surface state, etc. are not particularly limited. For example, the first area 2 may be a smooth surface (mirror surface), the second area 3 may be roughened by embossing with satin or fine unevenness, or the first area 2 may be laminated with an anti-slip material such as tape or rubber. The difference in frictional resistance between the second region 3 and the second region 3 can also be obtained by changing the value. Further, as another example, it is possible to change the frictional resistance by applying and coating a paint. However, particularly when the first area 2 is a smooth surface (mirror surface) and the second area 3 is a rough surface such as a matte surface or an embossed surface, it is easy to create a sheet and control the difference in frictional resistance. It is also preferable from the viewpoints of economy and the like. In addition, the degree of roughness of the rough surface of the second region 3 depends on the shape and size of the tear sheet and the container to be placed,
It is designed in consideration of the material and the like and the difference in frictional resistance between the first region 2 and the second region 3, but according to the experiments by the present inventors, the maximum height is 5 to 200 μm (JISB0601), preferably Is preferably in the range of 10 to 150 μm. Also,
The coefficient of friction of the second region 3 depends on the type of container material such as metal, glass or plastic, or the shape of the container bottom,
Although it depends on the weight of the container and the like, it is appropriate that the coefficient of static friction with respect to the container to be placed is in the range of 0.1 to 0.6, preferably 0.2 to 0.5. First area 2
The coefficient of static friction of is in the range of 0.2 to 0.7, and the first area 2
It is desirable that the difference in the coefficient of static friction between the second area 3 and the second area 3 be in the range of 0.01 to 0.4. The width of the first region 2 at the peripheral portion of the tear sheet is designed in consideration of the size and shape of the container to be placed, the number of stacking stages, etc.
Although not particularly limited, it is usually selected within a range of about 1 to 25 cm. In addition, the first area 2 and the second area 3
The area ratio to the total area of the
~ 70% vs 98-30%, preferably 3-65% vs 97
.About.35%, more preferably 5 to 60% vs. 95 to 40%.

FIG. 2 is a plan view of another embodiment of the present invention. The tear sheet 1 has a first frictional resistance
As the area 2, a smooth surface (mirror surface) is provided at the boundary portion 4 where the peripheral edge portion and the strip-shaped portion of the sheet intersect, and the rough surface portion as the second area 3a having the second frictional resistance smaller than the first frictional resistance is provided. It is scattered. The number and total area of the second regions 3a can be appropriately determined depending on the type of container or the like handled. The second area 3a of the tear sheet shown in FIG. 2 is rectangular, but as another modification of the tear sheet of the present invention, it can be designed according to the shape and size of the container to be placed, the number of stacking stages, etc. It may be a rough surface portion having a strip shape or other suitable shape, or may be constituted by an irregular rough surface portion. For example, the individual shapes can be changed into strips, circles, triangles, squares, rectangles, other polygons,
The shape can be a rhombus, a flower, a star, an irregular cloud, or the like.

The material of the tear sheet of the present invention is as follows:
Homopolymers such as low, medium and high density polyethylene, polypropylene, polybutene-1, poly-4-methylpentene-1, and other α containing ethylene or propylene as a main component
Examples include olefin polymers such as copolymers with olefins, polyamide resins, polyester resins, polyvinyl chloride resins, and thermoplastic resins such as mixtures thereof. Of these, propylene homopolymers, propylene-based polymers such as the same block or random copolymers are particularly preferable. 100 to 50% by weight of propylene polymer, 0 to 5 of polyethylene polymer and / or rubber
A resin composed of 0% by weight of an olefin resin is most preferable because it has excellent mechanical properties, heat resistance, low temperature embrittlement properties, and the like. As the rubber, styrene-
Butadiene copolymer rubber, ethylene-propylene copolymer rubber, ethylene-propylene-diene copolymer rubber,
Examples thereof include synthetic rubber such as butyl rubber and chloroprene rubber, and natural rubber.

The thickness of the tear sheet of the present invention is usually 0.1.
The range is 3 to 15 mm, preferably 0.5 to 10 mm
It is desirable to select from the range. If the thickness of the tear sheet is less than 0.3 mm, the mechanical strength of the sheet may be insufficient. On the other hand, if the thickness exceeds 15 mm, handling may be difficult.

Further, within the scope of the present invention,
The structure of the tear sheet of the present invention may be provided on one side or both sides of other base material, for example, paper, plywood, metal plate, cloth or the like, or a thermoplastic resin sheet may be laminated.
Furthermore, in order to prevent static electricity, antistatic agents, metal powder, metal fibers, carbon black, carbon fibers, and other conductive materials are added, and other antioxidants, ultraviolet absorbers, pigments,
You may mix additives, such as a dye, a crosslinking agent, and a foaming agent.

FIG. 3 is a schematic process diagram showing an example of the tear sheet manufacturing apparatus of the present invention. The tear sheet manufacturing apparatus shown in FIG. 3 includes a sheet feeding apparatus 100 and a shaping apparatus 10.
4, an annealing device 118, an ear cutting device 120, a buffer section 140, a sheet cutting device 150, and a tear sheet stacking device 170. The sheet supply means is composed of a sheet supply device 100, which supplies synthetic resin pellets mixed with a predetermined additive to the hopper 101, and supplies a thermoplastic resin sheet S in a molten state with a predetermined size from the T die 103 of the extruder 102. It is a device that does.
The sheet feeding means may be a ready-made sheet manufactured in advance, and in that case, it is desirable to heat the ready-made sheet and introduce it into the shaping means described later. The shaping device 104 as a shaping means includes a pair of shaping rolls 105 and 1.
06 and roll 107, annealing rolls 108 and 109 for removing the distortion of the sheet S by preheating, and cooling roll 110, which are pivotally supported by a frame 116. The annealing device 118 is rotatably supported by the frame 117 and is freely rotatable.
To 115 are provided.

The ear cutting device 120 has rolls 121, 122, 126 and 127 for adjusting the sheet take-up speed, as shown in detail in FIGS. 4 and 5. Also, rolls 121 and 122 and rolls 126 and 1
Two rotary blades 124a and 125a for cutting off one edge of the sheet S are provided between the two and 27, and two rotary blades 124b, 125b for cutting off the other edge of the sheet S.
On the other side. At the next stage of the rolls 126 and 127, a rod-shaped member 130c is provided above the sheet S along the width direction of the sheet S. Further, the ear portions 129a and 129 of the sheet S are provided above the rod-shaped member 130c.
Members 130a and 130b for leading out b are provided. The derived ears 129a, 129b are crushed by a crusher (not shown) and recycled. The derived ears may be wound up.

A buffer section 140 is provided next to the ear cutting device 120. When the sheet S is cut by the next-stage sheet cutting device 150, the traveling of the sheet S in the sheet cutting device 150 is temporarily stopped, as described later. On the other hand, since the sheet S is continuously sent out from the ear cutting device 120 in the previous stage, the buffer section 1
The sheet S is slackened at 40 to make an adjustment between these steps.

As shown in detail in FIGS. 6 and 7, the sheet cutting device 150 as a cutting means comprises a cutting means composed of a pair of upper and lower feed rolls 151 and 152 and a pair of upper and lower guillotine type cutter blades 155 and 156. . The feed rolls 151 and 152 are axially supported by the frame 154 of the cutting device 150, and are rotationally driven by the drive device 153. The lower cutter blade 156 is fixed to the frame 154 of the apparatus by fixing means 158. The upper cutter blade 155 has drive means 157a, 1
57b allows vertical movement in the direction of arrow X1. 160 is a limit switch for detecting the front end portion 159 of the sheet S, and 164 is a limit switch switch 1.
The signal from 60 is input, and the drive device 153 of the feed roll 151 and the drive device 157 of the cutter blade 155 are input.
2a is a detection control circuit that outputs a drive control signal for controlling the operations of a and 157b. The detection control circuit 164 uses the sheet S
It is detected that the tip end portion 159 of the contact portion 159 comes into contact with the limit switch 160, and at this time, the feed rolls 151 and 152 are stopped, and a drive control signal for driving the cutter blade 155 downward is output. As a result, the sheet S is cut by the cutter blades 155 and 156 when the leading end 159 of the sheet S comes into contact with the limit switch 160,
A tear sheet a of a predetermined size is created. The setting position of the limit switch 160 can be adjusted. 162 and 163 are conveyor belts for feeding the tear sheet a obtained by cutting the sheet S in the direction of arrow X2.

The sheet stacking device 170 stacks the tear sheets a sent out by the conveyor belts 162 and 163, and as shown in FIG. 8, a base 177 and a pantograph type provided on the base 177. It has a link mechanism 173 and a mounting table 178 that can be moved up and down by the link mechanism 173. For example, a wooden pallet 172 is placed on the placing table 178, and the pallet 1
The tear sheets a sent from the direction of the arrow X3 are sequentially stacked on the 72. Reference numeral 171 indicates a stacked tear sheet a. The mounting table 1 so that the tear sheet a stacked on the wooden pallet 172 can be easily carried out.
A plurality of rollers 179 are provided at 78. The mounting table 178 is moved up and down by the link mechanism 173, and the uppermost portion of the tear sheet a, that is, next the tear sheet a.
Conveyor belts 162 and 163 are overlapped with each other.
It is adjusted to be slightly lower than the ejection position of the tear sheet a ejected from. Tear sheet a is arrow X
In order to prevent the position of the tear sheet a from being introduced from the direction of 3 and being stacked with respect to the already stacked tear sheet a (or the wooden pallet 172), the stacking device 170 is Member 17 for alignment
4a, 174b, and 176. Reference numeral 176 is a stopper fixed to a rod-shaped member 175 attached to a frame (not shown). The tear sheet a introduced from the direction of the arrow X3 is stopped by the stopper 176. As a result, alignment in the front-rear direction (the traveling direction of the tear sheet a) is performed. Members 174a and 17
4b is fixed to the frame for determining the left and right positions of the tear sheet a near the position where the next tear sheet a is introduced on the uppermost part of the already loaded tear sheet a.

An example of a method for manufacturing a tear sheet made of a polyolefin resin by using the above manufacturing apparatus will be described in detail. First, a polyolefin resin mixed with a predetermined additive such as an antioxidant is supplied to the hopper 101, and the molten sheet S is extruded from the T die 103 and supplied to the shaping device 104. At that time, a first region having a large frictional resistance (for example, a mirror surface) is provided on the peripheral portion of at least one roll, and a second region (for example, an embossed surface) having a smaller frictional resistance than the first region is provided on the inner side of the sheet. Rolls 105, 1
06, and a temperature of 200 to 260 ° C., preferably 22
Shape in the range of 0 to 240 ° C. Shaped sheet S
At a temperature of 50-140 in the annealing device 118.
After removing the strain at the time of forming the sheet in the range of ℃, the selvage is cut by the selvage cutting device 120 to a predetermined size, and the sheet cutting device 150 at the next stage further cuts the first region of the shaped sheet S having a large friction resistance Intermediate part 5 between (for example, mirror surface) 2 and the adjacent first region 5
(See FIG. 9) is cut by the cutter 155, the cut sheets are conveyed, and the sheets are stacked in the sheet stacking device 170 in order every predetermined number of sheets. This is stored or shipped by a forklift or the like. When manufacturing the tear sheet a of the present invention, the pair of shaping rolls 10 is used at the time of shaping as described above.
The roll temperature of at least one of 5 and 106 is 20 to 11
A temperature of 0 ° C., preferably 50 to 100 ° C., is desirable in order to prevent the sheet S from adhering to the roll during shaping. When the embossing of the second region having the small frictional resistance is performed, the roll having the maximum height of 5 to 200 μm in surface roughness is used as the embossing roll to maintain the performance of the tear sheet. Desirable above. The tear sheets formed in this manner are bundled by the stacking device 170 into a predetermined number of sheets, and a predetermined number of sheets are stacked and unloaded.

As mentioned above, the tear sheet of the present invention is
1) Large frictional resistance on one or both sides of the sheet
Since the container has a region and a second region having a smaller frictional resistance than the first region on the inner side of the seat, the container does not slip off from the tear sheet due to vibration during transportation, and palletizing or depalletizing work is performed. Even inside, the sheet will not be pulled by the container and the load will not collapse. Further, by adding an inorganic filler or a conductive fiber to the sheet of the present invention, performances such as heat resistance and antistatic property can be easily imparted. These tear sheets are suitable for cleaning or sterilizing the sheets, especially when used in unfilled containers.

[0021]

EXAMPLES The present invention will be specifically described below based on Examples and Comparative Examples, but the present invention is not limited thereto. The test method is as follows. <Tensile test> JIS K6911 <Flexural modulus> JIS K7203 <Izod impact strength (with notch)> JIS K7110 <Heat deformation temperature (4.6 kg)> ASTM D 648 <Specific surface resistance> JIS K6911 <Ash test> Cotton gauze Rub 30 times with and visually observe the degree of adhesion of dried tobacco ash. Judgment criteria: ○ = no adhesion, △ = small quantity adhesion, × =
A large amount adheres. <Immersion test> A test piece of 150 x 150 mm was immersed in a hot water tank at 90 ° C for 5 minutes, and then the test piece was taken out and air-cooled, which was repeated 50 times, and then the surface resistivity and the like were measured. <Heat cycle test> Unfilled coffee cans (250 g) are arranged and loaded on a 300 x 300 mm test piece in 6 rows x 6 rows, and a test piece of the same size as the test piece is placed on it. Furthermore, it loads similarly. The test piece of the same as above is put on it again, and the top plate with a load of 10 kg is placed. Set this as one unit, leave it in an air oven at 160 ° C for 2 minutes,
The operation of taking out and cooling with air was repeated 50 times, and the deformation value due to heating was observed. The deformation value is determined by visually observing the wavy state of the test piece in the following four stages. Criteria: 0 = no waviness, 1 = slight waviness is observed, 2 = slightly wavy, 3 = clear wavy. The static voltage half time is 10kV × 2 for a 40 × 40mm test piece using a static Honest meter (made by Shishido Shokai).
The applied charging was performed for 0 seconds, and the time until the charged voltage was halved was measured. When it is hardly charged, the half-life is 1 second or less.

Example 1 <Production of tear sheet> Homopolypropylene (MFR =
1.0 g / 10 minutes, trade name: Nisseki Polypro J120G, manufactured by Nippon Petrochemical Co., Ltd.) was used with a 90 mmφ extruder, and a series of devices shown in FIG. A sheet having a thickness of 1.0 mm and a width of 1,500 mm was formed at a temperature of 70 ° C., a surface roughness of the shaping roll: 20 μm, and a take-up speed of 5 m / min. From this sheet 1,440 × 1,13
A tear sheet having a roundness of 0 mm and each corner having a radius of 25 mm was obtained. <Physical properties of tear sheet> Sheet size: length 1,440 x width 1,130 x thickness 1.0
mm Friction coefficient for metal can in the first area (mirror surface) with high frictional resistance: 0.3 Friction coefficient for metal can in second area (satin finish) with low frictional resistance: 0.24 Yield point strength [MD / CD] ( kg / cm ² ): 223/18
0 Strength at break [MD / CD] (kg / cm ² ): 194/16
3 Elongation rate [MD / CD] (%): 80/80 Flexural modulus [MD / CD] (kg / mm ² ): 15,700 /
15,200 Izod impact strength (kg ・ cm / cm): 3.5 Heat distortion temperature (℃): 131 ℃ The above MD represents machine direction (sheet moving direction), and CD represents cross direction (lateral direction). Represent <Tear sheet supply / discharge / transport test> 20 empty metal cans (diameter 52.8φ x height 133mm, weight 43.3g) x
20 units × 16 stages were loaded, and a unit load having the tear sheet sandwiched between the stages of the cans was made to carry out a transportation test. Transport is palletizer → chain conveyor → polypropylene banding → shrink packaging → forklift →
The test was conducted in the process of storage in warehouse → forklift → truck → forklift → chain conveyor → depalletizer. The palletizer is a packing machine that receives cans from the conveyor on the tear sheet, slides them on the sheet with pushers, and aligns them from the back of the sheet.The depalletizer slides the cans on the tear sheet with the pusher. It is a machine that moves and pushes it onto a conveyor. The conditions for shrink wrapping are: film thickness 60μ
m, heating temperature 150 ° C. and heating time 1 minute. The measurement results are shown in Table 1.

[0023]

[Table 1]

Example 2 Polypropylene homopolymer used in Example 1
100 parts by weight of talc (average particle size 10 μm, water content 0.1
3%, white scale-like; trade name: PK-C, Hayashi Kasei Co., Ltd.
5 parts by weight and carbon fiber (diameter 7 μm, fiber length 0.2 m
m; trade name: Granock, manufactured by Nippon Oil Co., Ltd.) 10 parts by weight
And 0.2 parts by weight of titanium dioxide (rutile type 1st class defined in JIS K5116) were kneaded and pelletized by a twin-screw extruder, and the apparatus used in Example 1 was used to obtain a shaping temperature of 24.
0 ℃, chill roll temperature 70 ℃, take-up speed 1.5m / min
The thickness is 1.0 mm, the width is 1,500 mm, the mirror surface width of the peripheral edge is 100 mm (area ratio 29.1%), the peripheral friction coefficient is 0.3, and the inner area (area ratio 70.9%). A sheet having a friction coefficient of 0.24 was molded. 1,4 from this sheet
A tear sheet having a roundness of 40 × 1,130 mm and a radius of 25 mm at each corner was obtained. An immersion test and a heat cycle test were performed on the above tear sheet and evaluated. The results are shown in Table 2.

[0025]

[Table 2]

Sheets (A) of Example 3 and Comparative Examples 1 and 2, Example 2 and sheets (B) having the same composition as Example 2 and having a rough surface (friction coefficient of 0.24).
And the sheet (C) having the same composition and having a mirror surface (friction coefficient of 0.3) on all surfaces, the test of Example 1 was repeated 10 times to perform performance and durability tests, and the cans in palletizers and depalletizers were tested. Observation of tearing and abrasion of tear sheet due to sliding, change in shape of tear sheet due to shrink wrapping (film thickness 60 μm, heating temperature 150 ° C, heating time 1 minute) and the effect of these on conveyor transport and truck transport did.
The test results are shown in Table 3. As a result of the above test, it was verified that the sheet (A) of the present invention has the most excellent performance.

[0027]

[Table 3]

[0028]

As described above, in the tear sheet of the present invention, the first region having the first frictional resistance on one side or both sides of the sheet and the second region having a smaller frictional resistance than the first region on the inner side of the sheet. By providing the second area having the frictional resistance of the can, during the palletizing or depalletizing work, the sheet is not dragged due to the sliding of the supply and discharge of the container, and the can does not fall or the load collapses. Sometimes the container does not slip off the tear sheet. Further, it is excellent in mechanical strength such as water resistance, heat resistance, conductivity, rigidity and chemical properties, and can be recycled.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of a tear sheet of the present invention.

FIG. 2 is a plan view of another embodiment of the tear sheet of the present invention.

FIG. 3 is a schematic side view of the tear sheet manufacturing apparatus of the present invention.

FIG. 4 is a side view of the ear cutting device.

FIG. 5 is a plan view of the ear cutting device.

FIG. 6 is a side view of the sheet cutting device.

FIG. 7 is a plan view of the sheet cutting device.

FIG. 8 is a perspective view of a sheet stacking device.

FIG. 9 is a schematic diagram showing a state of a shaping roll and sheet cutting.

[Explanation of symbols]

1 Tier sheet 2 First area of tear sheet 3,3a Tier sheet 2nd area 4 Tier sheet boundary 5 Intermediate part between the first area and the second area 100 sheet feeder 104 shaping device 118 Annealing device 120 ear cutting device 150 sheet cutting device 170 sheet stacking device

Claims (17)

[Claims] 1. A first surface having a first frictional resistance on one surface thereof.
A tear sheet provided with a region and a second region having a second frictional resistance smaller than the first frictional resistance. 2. The tier according to claim 1, wherein the other surface is also provided with a first region having a first frictional resistance and a second region having a second frictional resistance smaller than the first frictional resistance. Sheet. 3. The tear sheet according to claim 1, wherein a first region having a first frictional resistance is provided on a peripheral portion of the sheet. 4. The second frictional resistance according to claim 3, wherein the first region having the first frictional resistance is provided at the boundary portion where the sheet peripheral portion and the belt-shaped portion intersect each other. A tear sheet that is characterized by dividing the area and scattering it. 5. The tear sheet according to claim 1, wherein the first region having the first frictional resistance is formed as a mirror surface and the second region having the second frictional resistance is formed as a rough surface. 6. The difference in static friction coefficient between the first region having the first frictional resistance and the second region having the second frictional resistance having a smaller frictional resistance than that of 0.01 to 0.01.
A tear sheet in the 0.4 range. 7. The ratio of the first area having the first frictional resistance and the second area having the second frictional resistance to the total area of the first area is 2 to 70% and 98 to 3 respectively.
A tear sheet that is in the 0% range. 8. The tear sheet according to claim 1, wherein the tear sheet is made of a polyolefin resin having a thickness of 0.3 to 15 mm. 9. The polyolefin resin according to claim 8, wherein (A) 50 to 100% by weight of polypropylene resin and (B) polyethylene resin and / or rubber 0 to 50.
A tear sheet consisting of weight percent. 10. The tear sheet according to claim 8, wherein the polyolefin resin is mixed with 50% by weight of an inorganic filler. 11. The inorganic filler according to claim 10,
A tear sheet which is at least one selected from the group of talc, calcium carbonate, conductive fibers and glass fibers. 12. The tear sheet according to claim 1, comprising a laminated structure in which a sheet having a first frictional resistance and a sheet having a second frictional resistance are laminated. 13. A sheet supply means for supplying a predetermined sheet, and a first area having a first frictional resistance on the sheet,
A tear sheet comprising: a shaping means for shaping a second region having a second frictional resistance smaller than the first frictional resistance; and a cutting means for cutting the shaping sheet. Production method. 14. The method of manufacturing a tear sheet according to claim 13, wherein the sheet feeding means feeds the molten thermoplastic resin sheet extruded from the extruder at a temperature of 200 to 260 ° C. 15. The shaping means according to claim 13, wherein the shaping means has a first region having a first frictional resistance at a peripheral portion of the sheet and a second frictional resistance smaller than the first frictional resistance at an inner portion thereof. A method for manufacturing a tear sheet, characterized in that the second region that is provided is formed by a pair of shaping rolls. 16. The method of manufacturing a tear sheet according to claim 15, wherein at least one of the pair of shaping rolls is shaped in a temperature range of 20 to 110 ° C. 17. The surface-roughness according to claim 15, wherein the first region having the first frictional resistance is formed as a mirror surface, and the second region having the second frictional resistance has a maximum height of 5 to 200 μm. A tear sheet manufacturing method characterized by shaping with a roll.