KR100651758B1 - Electro-static sponge roll and the fabrication process - Google Patents

Abstract

The present invention provides a roll tube comprising a roll surface formed by attaching a mandrel to a thermally meltable sponge block to which charge is imparted; A core shaft installation lumen formed by melting and punching a heat-melting sponge block to which charge is imparted with a heating punch at 200 to 500 ° C .; A mandrel inserted into the lumen and crosslinked or thermally bonded to the lumen; It provides a chargeable sponge roll comprising an adhesive layer formed on the main shaft main surface and inserted into the lumen and then adhesively fixing the lumen and the mandrel. According to the present invention, a roll tube sponge of a toner supply roll is prepared based on TPE or plastics; Heat-bonding the roll tube and the mandrel (partially crosslinked), and providing a large amount of conductivity imparting agent to the roll tube sponge to provide a chargeable sponge for toner supply having a volume resistance of 10 ³ to 10 ⁹ Ω; Using a heating punch to quickly drill the mandrel insertion lumen into the sponge block for the roll tube at low cost; The present invention provides a technique for crosslinking or thermally bonding a mandrel to a chargeable sponge by inserting a mandrel provided with a conductive hot melt film or a thermosetting adhesive film on a main surface thereof and then heating the mandrel.

Description

Electrostatic sponge roll and its manufacturing method {Electro-static sponge roll and the fabrication process}

1 is a manufacturing process diagram of the present invention

Figure 2 is a plan view of the toner supply roll of the present invention produced in the embodiment

Figure 3 is a front view of a conventional toner supply roll

<Description of Major Reference Drawings>

11 is a roll tube; 13 is a roll surface; 12 is a sponge block; 21 is lumen; 31 is a mandrel; 41 is an adhesive layer; 51 is a heating punch; 42 is an adhesive layer (adhesive layer by a conductive hot melt film or a thermosetting adhesive film)

The present invention is to provide a chargeable sponge roll and a method of manufacturing the same.

Paper or toner supply rolls installed in these apparatuses including document (printing) functions such as inkjet printers, laser printers, and facsimile machines may be made of rubber or polyurethane foam, which is a thermosetting resin, as cited in FIG. It is manufactured by inserting the mandrel 3 for driving the roll into the center lumen 2 of the roll tube 1 and cutting the surface 1a of the roll tube 1 to a roll specification.
When the roll tube is made of solid silicon, the weight of the product is heavy, the price of the product is high, and the toner is sometimes supplied as a lump when feeding the toner. In addition, since the rubber or polyurethane sponge is a thermosetting resin, it is possible to form a lumen for installation of a mandrel in a roll tube by a punching or cutting drilling method, so that installation processing of the lumen is very difficult, and in particular, a hot rod or hot wire proposed by the present invention. stick) cannot install the lumen. As an exception, a special PU sponge is produced, so it is expected to use a heating rod, but this is very difficult to implement.

The conventional toner supply roll is coated with an adhesive on the mandrel when the mandrel is attached to the lumen, and inserted into the lumen of the tube to crosslink and adhere, thereby reducing productivity. In the case of using polyurethane foam as the material of the roll tube, the heterogeneity of the foam cell is also investigated.
The roll tube materials involve technical difficulties in making the roll tube into a sponge having an electrical property of 10 ⁵ Ω or less when the roll tube is made of a chargeable sponge. Non-uniformity of the sponge cells in the toner supply rolls results in non-uniformity in the toner supply amount, thereby degrading print quality.

Conventionally, silicone toner supply rolls (rubber rolls) or polyurethane sponges have been used as toner supply rolls that are importantly involved in print quality in office printing apparatuses including laser printers and fax machines. However, even though these toner supply rolls are expensive, non-uniformity of sponge cells is pointed out as a limitation of print quality improvement. According to the industry's point of view, development of a toner supply roll using TPE or thermoplastic sponge, which is easy to manufacture and inexpensive, is required. Has become a development challenge.

In providing the toner supply roll as described above, the present invention provides a technique for quickly drilling a mandrel insertion lumen with a heating punch and bonding the roll tube and mandrel with a conductive hot melt adhesive, and partially crosslinking the TPE to roll tube and mandrel. It is possible to provide a toner supply roll having good volume resistivity properties by adhering a large amount of conductive imparting fillers in the manufacture of a sponge by adhering to.

The present invention seeks to provide a chargeable sponge roll based on TPE or plastics on the roll tube sponge of the toner supply roll.

The present invention is to provide a chargeable sponge roll having good volume resistance characteristics by partially crosslinking the roll tube and the mandrel (crosslinking only the contact portion between the lumen and the mandrel) and incorporating a large amount of conductive imparting filler into the roll tube sponge. will be.

An object of the present invention is to provide an electro-static sponge or electrification sponge roll for toner supply having a volume resistance of 10 ³ to 10 ⁹ Ω.

SUMMARY OF THE INVENTION The present invention seeks to provide a chargeable sponge roll in which a mandrel insertion lumen is rapidly drilled at low cost on a roll tube sponge block using a hot wire or stick.

The present invention perforates the lumen in the chargeable sponge block, inserts a mandrel with a conductive hot melt film applied to the main surface, and then heats the mandrel to cross-bond or heat-bond the mandrel to the chargeable sponge, and cuts the mandrel-attached sponge to cut the main surface of the roll It is to provide a chargeable sponge roll to form a.

The present invention will be described in detail with reference to the accompanying drawings.

A core lumen installation lumen 21 formed by melt-punching with a heat punch 51 at a temperature of 200 to 500 ° C. to a heat-melting sponge block 12 to which charge is imparted;

A mandrel 31 inserted into the lumen 21 and adhered to the lumen by either crosslinking or thermal bonding;

Either a conductive hot melt film or a heat curable adhesive film applied to the main surface of the mandrel 31 in order to adhesively fix the mandrel 31 inserted into the lumen 21 and the heat-melting sponge block 12 to which the charge is imparted. An adhesive layer 41 formed on the main shaft main surface by an adhesive film 42;

A roll tube provided by inserting and attaching the mandrel 31 provided with the adhesive film 42 to the lumen 21 of the heat-melting sponge block 12 to which the chargeability is imparted, and forming a roll surface 13. 11); Configured.

The hot melt sponge block 12 is a sheet of any one of an electro-static plastic sponge sheet, a chargeable thermoplastic elastomer (TPE) foam sheet, and a chargeable thermo plastic urethane (TPU) foam sheet. Is a sponge block 12 cut to a size such that the surface can be processed with a toner supply roll.

The hot melt sponge block 12 can be used to quickly puncture the lumen with a heating punch, and uses a sponge block having a hardness of 5 to 50 / Shore-C to minimize deformation during the drilling process.

The thermally curable adhesive layer 41 provides a conductive hot melt film or a thermally curable adhesive film 42 to the mandrel surface, and inserts a mandrel having the film 42 formed therein into the lumen 21 to 120 to 250 ° C. By heating, the mandrel and lumen were crosslinked or thermally bonded.

When the present invention is described as a manufacturing step, the present invention, the chargeable sponge roll is prepared by adding a conductivity imparting agent, a viscosity control agent, a blowing agent to the base polymer in an appropriate amount and foaming in a container to prepare a chargeable plastic sponge sheet;

Cutting the chargeable sheet into a sponge block and forming a lumen insertion by a heating punch;

Providing a conductive hot melt adhesive layer or a thermosetting adhesive layer on the main surface of the mandrel;

The mandrel provided with the conductive hot melt adhesive layer is inserted into the lumen and heated to crosslink or heat-bond the mandrel and lumen.

Preparation of Electro-static Plastics Sponge Sheets

The plastic sponge of the present invention including the characteristics of TPE (thermoplastic elastomer) is mixed with an appropriate amount of a conductivity-imparting agent, a viscosity control agent, and a blowing agent in a base polymer and foamed in a container to prepare a chargeable plastic sponge sheet.

In preparing the chargeable plastic sponge sheet, a general antioxidant, an antioxidant, and a coloring agent may be added to the material composition to enhance the physical properties of the sponge.

The base polymer is selected from SiStyrene vinylisoprene styrene (SVPS), Sithrene isoprene styrene (SIS), styrene block copolymer (SEPS, SEBS, SEEPS), polyethylene (PE), Thermo plastic elastomer (TPE), and thermoplastic blend compound.

The conductive agent is selected from furnace black, acethylene black, ketchin black, graphite, metal oxides (SnO ₂ , ZnO, MgO, etc) and metals (Ag, CU, Au, Fe, Ni, aluminum).

Viscosity modifier is selected from oil and plasticizer.

The blowing agent is selected from organic chemical foaming agents (generating CO ₂ , N ₂ and hydrogen gas such as DPT, AC, etc.) and inorganic chemical foaming agents (NaHCO ₃ , MgHCO _3, etc.).

Other additives include antioxidants, antioxidants and pigments.

The chargeable plastic sponge can also be produced by the base polymer polyurethane TPU (Thermo plastic urethane).

The present invention is as follows.

Example 1.

The following materials were mixed and foam cured in a container to prepare a chargeable plastic sponge sheet.

SIS 100 parts by weight;

10 parts by weight of SEBS;

2 parts by weight of zinc oxide (ZnO);

0.3 part by weight of stearic acid;

Furnace black 60 parts by weight;

Process oil 60 parts by weight;

12 parts by weight of Azodicarbon amide;

      1 part by weight of Peroxide;

Total 245.3 parts by weight;

Property measurement

Volume resistivity of sponge sheet: 10 ⁵ Ω

Specific gravity of sponge sheet: 0.15

Example 2.

The following materials were mixed and foam cured in a container to prepare a chargeable plastic sponge sheet.

SIS 70 parts by weight;

30 parts by weight of EVA (Ethylene vinyl acetate);

ZnO 2 parts by weight;

0.3 part by weight of stearic acid;

Furnace black 50 parts by weight;

Process oil 45 parts by weight;

10 parts by weight of Azodicarbon amide;

Peroxide 1 part by weight;

Total 238.1 parts by weight;

Property measurement

Volume resistivity of sponge sheet: 10 ⁶ Ω

Specific gravity of sponge sheet: 0.23

Example 3.

Adhesive Use Process

Using the chargeable sponge sheet and the mandrel prepared in Example 1, a toner supply roll was prepared as follows.

The chargeable sponge sheets were cut into sponge blocks of 40 mm x 40 mm x 380 mm, the size of which can be processed into roll tubes.

The lumen was melt-drilled in a dedicated jig with a 6 mm diameter, conical tip and heated to 220 ° C. Punch time was dog / 0.7 seconds.

Thermoset adhesives (Chemlock 205, 220 or Chemlock 807 silan coupling products, heat-hardening type) were applied to the main shaft surface with a diameter of 300 mm and a diameter of 7 mm and inserted into the lumen.

The sponge block in which the mandrel was inserted was heated at 130 to 160 ° C / 15 minutes to cross-link the mandrel and the sponge block.

The sponge block bonded to the mandrel was cut on a rubber lathe according to the design specification of the facsimile roll to prepare a toner supply roll.

Example 4.

Hot Melt Film Application Process

The chargeable sponge sheet was cut into 40 mm x 40 mm x 400 mm sponge blocks, which can be processed into roll tubes.

The lumen was melt-drilled into the sponge block in a dedicated jig with a heat transfer punch heated to 220 ° C. with a diameter of 5.5 mm, a length of 450 mm, and a tip of a cone. Punch time was dog / 0.7 seconds.

A tape-type hot melt tape having a thickness of 0.15 mm was adhered to a main shaft surface having a length of 300 mm, a diameter of 6.5 mm, and a length of 400 mm, and a film was formed and inserted into the lumen.

Processing characteristics by heating punch: Perforated sponge was melted and mostly remained in the form of a polymer film on the inner surface of the lumen, and almost no sponge crushing occurred during drilling.

The sponge block into which the mandrel was inserted was heated at 100-150 ° C./10 minutes to cross-link the mandrel and the sponge block.

In the rubber milling of the sponge block bonded to the mandrel, the toner supply roll recited in FIG.

As described above, the present invention provides a chargeable sponge roll on which a roll tube sponge of a toner supply roll is based on TPE or plastics; Providing a chargeable sponge roll that partially crosslinks the roll tube and the mandrel and enables the use of a large amount of conductivity imparting agent to the roll tube sponge; Providing an electro-static sponge or electrification sponge roll for toner supply having a volume resistance of 10 ³ to 10 ⁹ Ω; Providing a chargeable sponge roll that uses a hot wire or stick to quickly perforate the lumen for axle insertion into the sponge block for the roll tube at low cost; A chargeable sponge roll that drills the lumen into the chargeable sponge block, inserts a mandrel with a hot melt film on the main surface, and heats to crosslink and bond the mandrel to the chargeable sponge, and cuts the mandrel-bonded sponge to form a main surface of the roll. And a method for producing the same.

Claims (4)

1. A chargeable sponge roll comprising: a core shaft installation lumen formed by melt-punching into a heat-melting sponge block to which charge is imparted with a heating punch of 200 to 500 ° C; A mandrel inserted into the lumen and adhered to the lumen by either crosslinking or thermal bonding; An adhesive layer formed on the axial main surface by an adhesive film of any one of a conductive hot melt film and a thermosetting adhesive film applied to the axial main surface for adhesively fixing the axial inserted into the lumen and the heat-melting sponge block imparting the chargeability; ; A roll tube having a surface formed after inserting and attaching a mandrel provided with the adhesive film to the lumen of the charge-melting hot melt sponge block; Including a chargeable sponge roll. The method of claim 1, wherein the heat-melting sponge block for melt-drilling the lumen with the heating punch is an electro-static plastics sponge sheet, a chargeable thermoplastic elastomer (TPE) foam sheet And a thermo-melt sponge block obtained by cutting any one sheet of a chargeable thermo plastic urethane (TPU) foam sheet; The hot melt sponge block is a sponge block having a hardness of 5 to 50 / Shore-C in order to quickly puncture the lumen with a heating punch and minimize deformation during the puncture process; The heat curable adhesive layer is inserted into the lumen of the mandrel provided with any one of the hot melt film formed on the mandrel surface and the heat curable adhesive film formed on the mandrel surface into the lumen and then heated to 80 ~ 250 ℃ to the adhesive film is a mandrel and hot melt sponge An adhesive layer obtained by crosslinking a block; Antistatic sponge rolls. A method of manufacturing a chargeable plastic sponge sheet by manufacturing a sponge block adhered to a core shaft with a toner supply roll, and adding a conductive agent, a viscosity control agent, and a foaming agent to the base polymer in an appropriate amount and foaming in a container (including a mold). step; Cutting the chargeable sheet into a sponge block and forming a lumen insertion by a heating punch; Providing an adhesive film of any one of a hot melt film and a heat curable adhesive film to the main surface of the mandrel; Inserting the mandrel provided with the adhesive film into the lumen and heating the adhesive film to bond the mandrel and the lumen by any one of crosslinking and thermal bonding to form an adhesive layer; Chargeable sponge roll manufacturing method comprising a. 4. The base polymer of claim 3, wherein the base polymer is any one selected from among Sithrene vinylisoprene styrene (SVPS), Sithrene isoprene styrene (SIS), styrene block copolymer (SEPS, SEBS, SEEPS), polyethylene (PE), TPE, and thermoplastic blend compound Is a polymer of; One or more conductivity agents are selected from furnace black, acethylene black, ketchin black, graphite, metal oxides (SnO ₂ , ZnO, MgO, etc) and metals (Ag, CU, Au, Fe, Ni, aluminum). Grant material; The viscosity modifier is a viscosity modifier selected from Oil and plasticizer; The blowing agent is characterized in that it is one blowing agent selected from organic chemical blowing agents (generating CO ₂ , N ₂ and hydrogen gas such as DPT, AC, etc.) and inorganic chemical blowing agents (NaHCO ₃ , MgHCO _3, etc.); Method for producing a chargeable sponge roll.

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