JPH06301161A - Device of take-up roll of film and paper - Google Patents

Abstract

PURPOSE: To make it possible to solve the problems posed by the dents of a central cylindrical core and to provide protection against the tendency of a web to cause buckling, spoking or starring by adding a microporous polyurethane foam to the outside surface of this core. CONSTITUTION: The core 10 is enclosed by a layer 12 of a foam material. Namely, this device may be formed from cardboard, plastic or metals. The center having the outside surface consists of the cylindrical core 10 and the microporous polyurethane foam is applied on its outside surface. In such a case, the application of the foam material to the cardboard core by various methods is made possible. The lining of the paper is then spirally wound and is made applicable to the foam material adhered to the cardboard core. This process resembles a process for producing the cardboard core. Another method for applying the foam to the core 10 is to wind and adhere the foam around the core 10 and to butt the two ends against each other.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a core for winding a web of deformable material. The present invention relates to a waste-reducing core, especially in film and paper winding.

[0002]

Core indentations are the main source of waste when winding webs of paper or film. The core impression is
A variant of the web at or near the core, which becomes apparent after unwinding. Indentations are created by tape, the web itself, mud particles, web crease marks, or other surface irregularities near or near the core. Solutions to these problems have been proposed in the prior art (see DE-A-3,610,557), but these solutions are not always completely successful. There is no. In this regard, the solution described provides a core with a coating of elastic or plastic deformable material that deforms in relief so that the first web winding on the core never deforms in relief. It is to be.

However, German Patent Publication No. 3,61
When winding a photographic base material onto a core, as described in US Pat. No. 0,557, the very high pressure created continuously causes the web to be wound to collapse inward in radius. Is understood. Buckling
g), spoken (spokng) or sterling (starr)
This is known as ing) and produces more waste than is produced by this core indentation problem.

[0004]

The present invention solves the problems caused by core imprints while providing greater protection against the tendency of a wound web to buckle, spoke or sterling.

[0005]

The present invention is an apparatus for winding webs of deformable material. This device can be made from cardboard, plastic or metal,
The center with the outer surface consists of a cylindrical core. Microporous polyurethane foam is attached to the outer surface. In a preferred embodiment, the microcellular polyurethane foam is 100 μm
With an average pore size of.

[0006]

DETAILED DESCRIPTION Due to the pressure required to wind a roll of film or paper, the tape at the wrap end and core of the web is pressed against the layers above it, causing wrap and tape defects. German Patent No. 3,61
No. 0,557 describes the use of foam on a cardboard core which reduces such defects. However, after a series of winding experiments with both wide and narrow paper webs (using different foams covering the cardboard core), to reduce the defects of wraps and tapes Many useful soft foam materials (eg 10 lbs)
Commercially available closed-cell or open-cell polystyrene, polyethylene or polyurethane recognized as having a density of less than s / ft ³ (160.17 kg / m ³ ).
However, it was found that compared with an ordinary cardboard core, the buckle, the spoke, or the star was locally formed, and the defect was worse than the indentation of the wrap or the tape.

FIG. 1 is a cross-sectional view of a core 10 for winding a web of flexible deformable material. The core is a layer of foam material 12
Is surrounded by. The preferred thickness of this layer is about 1
/ 64 inch (0.397 mm) to about 3/8 inch (9.525 mm). The foam material can be applied to the cardboard core in various ways. The paper backing can be applied to a foam material that is then spirally wrapped and adhered to the cardboard core. This is similar to the method of making a cardboard core. Another way to apply the foam to the core is to wrap it around the core, glue it, and butt the two ends together.

An experiment was conducted by winding multiple rolls of 2.75 inch (69.85 mm) polyethylene resin coated paper around a core having three different types of core surface materials at two different web temperatures. went. 1
24 at a winding web temperature of 00 degrees F (37.8 degrees C)
The rolls were stored for 24 hours at room temperature and room temperature and then unwound to assess core indentation.

The types of core surfaces included in the experiment are as follows: Ordinary cardboard B. 0.065 inch (1.651 mm) thick polystyrene (Styrofoam) C.I. 0.055 inch (1.397 mm) thick highly elastic microcellular polyurethane foam on cardboard [Poron ™
Rogers Corp. Manufacture] All cores had a core coating thickness in addition to an inner diameter of 8 inches (203.2 mm) and an outer diameter of 9 inches (228.6 mm). The winding speed used was 200 ft / min (64
m / min). Roll is 0.375 inch thick, 2
The winding surface had an inch pile height 70 Shore indentation hardness surface winding drum. The contact force used was 15 pli (pound / linear inch).

The observation and evaluation of the web involves slowly unrolling the stored roll and visually scanning for lap marks, tape marks, core indentations, buckles, spokes or stars and other indentations. Needed. A high-intensity spotlight was used in reflection mode to facilitate observation. When the roll was unwound, it was stopped and the web was thoroughly inspected without pulling. The lap and foot numbers were also recorded when the indentation was found. The obtained results are graphed and shown in FIG.

As seen in FIG. 2, Poron 470
1-05 The use of a highly elastic microporous polyurethane such as a foam coated core produces 6 core indentations compared to a polystyrene coated core.
5% less. This is a very important and unexpected result. The material of choice is high density microcellular open cell urethane. The average cell size is about 100 μm.
The properties of the Poron 4701-05 material are as follows. The density is about 320 kg / m ³ . The compressive force for 25% material deflection at a 0.2 inch / min (5.08 mm / min) strain rate is 125 ± 35 kPa. Material compression at 70 ° F per ASTM 1667 (21.1 ° C) 2
Set to less than%. 20 inches / minute (508 mm /
Min) Tensile strength measured by strain rate is 1030kPa
Is. The material hardness is 24 Shore O indentation hardness.

An additional advantage is that Poron coated cardboard cores outperform other coatings in many reuses and are very durable for tape removal. Finally, this material is easier to clean and produces less particulate matter than other foam core coatings. Other preferred aspects of the invention are described below in connection with the claims. (Aspect 1) The apparatus according to claim 1, wherein the central core is made of cardboard. (Aspect 2) The device according to claim 1, wherein the central core is made of plastic. (Aspect 3) The device according to claim 1, wherein the central core is made of metal. (Aspect 4) The microporous polyurethane foam is about 1/64 inch (0.397 mm) to about 3/8 inch (9.525).
The device of claim 1 having a thickness of mm). (Aspect 5) Microporous polyurethane foam is about 100 μm
The device of claim 1 having an average pore size of (Aspect 6) The compressive force of the microporous foam is about 90 to about 160.
The device of claim 1 which is kPa. (Aspect 7) The tensile strength of the microporous foam is about 1030.
The device according to claim 1, which has a kPa (Aspect 8) density of the microporous foam of about 320 kg / m ^3.
Although the preferred embodiment of the present invention has been described in particular detail with respect to claim 1, it will be understood that modifications and alterations are possible within the spirit and scope of the invention.

[Brief description of drawings]

1 represents a cross-sectional view of a core of the present invention.

FIG. 2 represents a comparison of the average footprint foot counts of core impressions of various materials.

[Explanation of symbols]

 10 ... Core 12 ... Layer of foam material

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Alan Thomas Huy USA, New York 14430, Clarkson, Lake Road 3744, Pee. Oh. Box 569

Claims (1)

[Claims] 1. A device for winding a web of deformable material comprising a central cylindrical core having an outer surface, and a microporous polyurethane foam applied to the outer surface of the cylindrical core.