JP2008213395A - Production process of curing sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a production process of curing sheet, which allows jointly converting and reusing stretch films as a less slippery curing sheet; wherein the stretch films may be either an after-use disposal as industrial wastes or a spare left-over. <P>SOLUTION: The curing sheet made of the stretch films is formed as follows. After-use stretch films are collected and pulverized, then the pulverized stretch film is heat melted and pressurized at about 200°C, and extruded in a string shape from an extruder. The string shaped plastic body comprising the extruded stretch film is cut into granular pellets, and the pellet is made tubular by blowing up at a temperature set to about 180°C by an inflation molding machine. The tubular body is cut and cloven in one, two or more sections along its longitudinal direction, and reeled as a single sheet or one-way spread sheets. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention recycles used stretch film that has been used and collected for various purposes, and stretch film that remains unusable, and can be used for corridors and stairs of buildings such as public institutions and government offices in extension and renovation. Curing sheet for manufacturing curing sheets used in applications such as laying in factory corridors, laying in hallways when moving, etc., and striking and soiling the covered surface. It relates to the manufacturing method.

  Traditionally, in the logistics industry etc., various products and items packed in cardboard boxes are loaded on pallets and transported by truck, etc., but at that time, the loaded items etc. collapse or get wet with water, In order to prevent dust from being applied, a stretch film that is strong, stretchable, and has excellent adhesive strength is wrapped around the entire pallet to secure the product and transport it without collapsing. . The stretch film is used to prevent dust and pests from entering inside various machines and products, and to cover and protect work-in-progress products. Used for protection.

  The stretch film used in this way is unpacked and collected from the goods and machines after transporting the goods to the destination, and after being used to protect all goods such as machines and products. Like plastics, it is disposed of as industrial waste.

  However, in the present day when protection of the global environment is screamed, disposal of stretch film by incineration or the like as industrial waste has been a problem from the viewpoint of environmental pollution and resource protection.

  At present, recycled polyethylene raw material is used as a curing sheet. However, a curing sheet made of this polyethylene film has a problem that it is slippery, weak in strength, and cannot be produced unless the thickness is 40 μm or more. Moreover, in order to make the curing sheet made of polyethylene film difficult to slip, it has to be produced by adding a no-slip agent (adhesive) in the production process, resulting in an increase in production cost.

In addition, although the following patent document discloses a method for producing a curing sheet that reduces the unfolding force (rewinding force) without reducing the adhesive force, the used stretch film as in the present invention is used as a raw material. The manufacturing method was not performed.
Japanese Patent Laid-Open No. 11-92724

  The present invention has been developed in view of the above points, and has been re-made as a non-slip curing sheet by recreating both stretch films that have been disposed of by incineration or the like as industrial waste after use, and stretch films that are left over. The problem is to provide a method for producing a curing sheet that can be used.

  In order to solve the above-mentioned problem, the method for producing a curing sheet according to the first aspect of the present invention is to pulverize the collected used stretch film and to heat and pressurize the crushed stretch film at a temperature of about 200 ° C. And then extruded into a string from the extruder, the string resin body made of the extruded stretch film is cut into granular pellets, and the pellets are blown up by an inflation molding machine at a temperature set at about 180 ° C. In addition, the stretch film curing sheet is formed by cutting one or two or more portions of the cylindrical body in the longitudinal direction and winding it into one or a single-open sheet.

  Moreover, the manufacturing method of the curing sheet of this invention of Claim 2 is the manufacturing method of the curing sheet of Claim 1, The stretch film used after grind | pulverizing is the collect | recovered used stretch film and the remaining use remaining It is a front stretch film.

  The method for producing a curing sheet of the present invention according to claim 3 is the method for producing a curing sheet according to claim 1 or 2, wherein the rotation speed of the inflation film forming machine is the same as that of the polyethylene film for general use. It is characterized by being 30% slower than the normal rotation speed as a raw material.

  Further, the curing sheet manufacturing method of the present invention according to claim 4 is the curing sheet manufacturing method according to claim 1, 2, or 3, wherein a desired color is melted and kneaded with the pellets together with the pellets. It is characterized by forming a curing sheet.

  According to the method for producing a curing sheet of the present invention, it is possible to recycle and reuse a used curing film that has been conventionally disposed of by incineration, etc., and protect the global environment and resources. Can greatly contribute. And the curing sheet manufactured by this manufacturing method makes the best use of the adhesive properties of the stretch film without adding a no-slip agent (adhesive) to produce the effect of making it difficult to slip in the manufacturing process. In addition, a curing sheet stronger than a conventional curing sheet made of polyethylene film can be manufactured thinly, and the manufacturing cost can be greatly reduced compared to a conventional curing sheet, and compared with a conventional curing sheet. It can be used safely without slipping.

  In addition, according to the method for producing a curing sheet of the present invention, the remaining used stretch film is also used as a raw material for the curing sheet together with the collected used stretch film. In addition, the stretch film before use can be effectively used, and can greatly contribute to the protection of the global environment and resources.

  In addition, according to the method for producing a curing sheet of the present invention, the rotation speed of the inflation molding machine is lowered by about 30% compared to the normal rotation speed using general-purpose polyethylene pellets as a raw material. It is possible to wind up a curing sheet made of stretch film.

  Furthermore, according to the method for producing a curing sheet of the present invention, various color curing sheets are formed by forming a curing sheet by melting and kneading a pigment of a desired color into pellets formed by a stretch film in the production process. The curing sheet of a desired color can be properly used according to the application.

Hereinafter, the best mode for carrying out the present invention will be described.
First, after stacking multiple items packed in cardboard boxes etc. on a pallet, wrap around the multiple items together with a stretch film and fix them so that they do not collapse. transport. When you reach the destination, use a forklift to unload the items along with each pallet from the truck, unwrap the stretch film around the multiple items on each pallet, and put each removed stretch film into a collection cage. And put it together. The used stretch film is collected together with a collection cage and is carried to a curing sheet manufacturing factory that is a stretch film recycling factory. At this time, the remaining unused stretch film wound around the paper tube is also collected and carried to the curing sheet manufacturing factory.

  The used stretch film and the unused stretch film (hereinafter referred to as used stretch film, etc.) brought into (collected) into the curing sheet manufacturing plant as described above are a method for producing a curing sheet comprising the following steps: The curing sheet is manufactured using the recovered used stretch film or the like as a raw material.

  That is, the collected used stretch film and the like are removed from the paper tube, the resin tape, and the like, then conveyed by a conveyor, put into a pulverizer, finely pulverized, discharged, and temporarily stored in a hopper. The used stretch film discharged from the hopper and pulverized is heated and melted by a screw extruder at about 200 ° C., extruded into a string shape, passed through cooling water, and granulated into a cutting device. Be transported. The string-like resin (used stretch film or the like) body supplied into the cutting device is finely cut into pellets by the cutting device and packed in a bag or stored in a storage hopper.

  Next, the pellet (raw material) is set to about 180 ° C., and the pellet (raw material) is supplied to an inflation molding machine.

  The pellets (raw materials) supplied to the inflation molding machine are melted and kneaded in a cylinder and extruded from the gap between the circular dies (dies) to form a cylindrical stretch film, and air is further introduced into the cylindrical stretch film film. Blow and inflate, cool air to blow to form a stretch film cylinder, and while pulling, cut one or more stretch film cylinders in the longitudinal direction to make one or a single-open sheet A curing sheet is obtained by winding. In this case, the stretch film cylinder can be made into one curing sheet by cutting one place in the longitudinal direction, and by cutting two places in the longitudinal direction so as to have an equal width dimension. Two curing sheets having the same width can be obtained, and further, three or more curing sheets having the same width can be obtained by dividing three or more portions in the longitudinal direction so as to have uniform width dimensions. Of course, the stretch film cylinder may be cut at two or more locations in the longitudinal direction so as to have unequal width dimensions to form a plurality of curing sheets having different widths.

  Further, pellets made of a used stretch film are supplied to an inflation molding machine, and the rotation speed of the inflation molding machine is set to about 30% lower than the normal rotation speed using general polyethylene pellets as a raw material.

  In addition, it is also free to melt and knead pigments such as blue, green and red in the pellets (raw materials) to form a desired color curing sheet, and the desired color curing sheet can be used properly according to the application. it can.

  By processing the used stretch film collected in this way as a raw material and producing a curing sheet, it can be recycled as a curing sheet, contributing greatly to the protection of the global environment and resources, and the effective use of resources. Can do. In addition, used stretch film, which has been disposed of as industrial waste in the past, can be used as a non-slip curing sheet by taking advantage of the non-slip nature of stretch film, etc. In addition, the strength is strong, and the thickness can be reduced to about 30 μm while maintaining the same strength as a conventional curing sheet, and the manufacturing cost can be greatly reduced compared to a curing sheet made of a polyethylene sheet.

  The above-mentioned temperatures are about 200 ° C. and 180 ° C. are not limited to 200 ° C. and 180 ° C., and 200 ° C. can produce an appropriate curing sheet using a used stretch film or the like as a raw material. Appropriate temperatures before and after each of 180 ° C. are also included. In addition, the 30% position at a low speed of about 30% compared to the rotation speed described above is not limited to 30%, and is appropriately around 30% that can smoothly wind up the formed curing sheet without any problems. Includes speed.

Claims (4)

  The collected used stretch film is pulverized, and the crushed stretch film is heated, melted and pressurized at a temperature of about 200 ° C. and extruded from an extruder into a string shape, and a string-shaped resin body made of the extruded stretch film is formed. Cut into pellets, blown up by a blow molding machine at a temperature set to about 180 ° C. to form a cylinder, and cut one or two or more parts of the cylinder in the longitudinal direction, A method for producing a curing sheet, characterized in that a stretch film curing sheet is formed by winding a single-open sheet.   2. The method for producing a curing sheet according to claim 1, wherein the stretch film to be used after pulverization is the collected used stretch film and the stretch film before use which is left over.   The curing sheet according to claim 1 or 2, wherein the rotation speed of the stretch film pellets is about 30% lower than the normal rotation speed of the general polyethylene pellets. Manufacturing method.   The method for producing a curing sheet according to claim 1, 2 or 3, wherein a pigment having a desired color is melt-kneaded together with the pellets to form a curing sheet having a desired color.