AU667853B2

AU667853B2 - Masking film and its manufacturing method

Info

Publication number: AU667853B2
Application number: AU30085/92A
Authority: AU
Inventors: Takeshi Yamazaki
Original assignee: JOHOKU KOGYO CO Ltd; OWAKI CO Ltd
Current assignee: JOHOKU KOGYO CO Ltd; OWAKI CO Ltd
Priority date: 1992-12-10
Filing date: 1992-12-10
Publication date: 1996-04-18
Anticipated expiration: 2012-12-10
Also published as: AU3008592A

Description

1' ("67 85 3

AUSTRALIA

Patents Act 1990 COMPLETE SPECIFICATION STANDARD PATENT Applicant(s): JOHOKU KOGYO CO., LTD.

OWAKI CO., LTD.

4. 40 4 9 44 4 4 44 Invention Title: MASKING FILM AND ITS MANUFACTURING

METHOD

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4 4 .4 4, 4 4 The following statement is a full description of this invention, including the best method of performing it known to me/us: Z. r 2 FIELD OF THE INVENTION: This invention relates to a masking film product suitable for covering up a portion not to be painted during a painting operation of, for instance, building walls, and a manufacturing method thereof.

BACKGROUND OF THE INVENTION: In order to cover up a portion or portions of a building wall not to be painted, ordinarily, paper sheets from newspapers or other used papers have been used and applied in place with a pressure-sensitive adhesive tape or other fixing means in the periphery. More often than not, the paining operation is to be made in an elevated location with bad footing and sacrifice of the both hands to the covering opera .on, thus making the operation overall dangerous.

0 oWhen a wide window is to be covered, a great deal of papers °o have to be elevated to the place of operation, and papers are susceptible of breakage under wind and or unavoidable vibrations, thus resulting inadvertent painting of the 20 portion not to be painted.

o Do OBJECT AND STATEMENT OF THE INVENTION: o 0 This invention has the object of providing a masking film product. According to the invention there is provided a method for manufacturing a masking film product from a length of an elongate, flattened tubular sheet member formed by a soft synthetic resin film, comprising the steps of: pleating said sheet member with the opposite longitudinal edges folded back into the tubular sheet to a substantially equal distance to produce a multiple-ply V^JQ -L i 3 sheet member with the width reduced to one half of the width of said flattened tubular sheet; cutting the web of the multiple-ply sheet member along a line parallel to and near one of said longitudinal edges; manipulating the cut edge of the sheet member to produce a flap portion for receiving a pressure-sensitive adhesive; pleating the multiple ply sheet member along a central longitudinal axis to produce a sheet member with the doubled plies; applying a both-sided pressure-sensitive adhesive tape on said flap portion with the adhesive layer of the tape fixed thereto; and winding the resultant sheet menmber in a roll and cutting the sheet member at a determined length.

A thin film used for the purposes of an embodiment is as thin as about 10 to about 20 micron mms and is formed in an elongate, flattened tubular shape.

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Q.0 0 0a 0 0 In the first step of an embodiment, the sheet pleated with the opposite long edges folded back tubular shape to a substantially equal distance.

is critical for facilitating the subsequent making plies in the sheet member against loss of 25 The width of the resultant sheet member is compared to that of the original sheet member.

member is inward the This step steps for the shape.

halved as 1 i o D o ou 0 o 9 o

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0 0 000 0 0 0 000 0 0 0 0 In the second step of an embodiment, the web of the sheet 4 member resulted from the first step is cut along and adjacent one of the long edges.

As performing the method of an embodiment of this invention, raw material is supplied continuously from a roll as an elongate sheet member and continuous subjected to the steps of the method of the invention. Obviously, the cutting operation in the second step can thus simply be achieved by retaining a stationary cutting blade in place relative to work while the latter is running.

The step follows where the cut edge of the multiple ply sheet member is opened in the outer direction. The flap portion resultant from the opening operation can serve a base to which a both-sided pressure-sensitive adhesive tape is to be applied.

0°"o The multiple ply sheet member thus provided is then pleated i'"0 along the central longitudinal axis to provide a sheet member with the plies doubled. The doubled ply sheet member may contain 8-ply web sheet portions with the width o °o reduced to one fourth compared to the original sheet member. With the reduced width, the resultant member will be thin as about 80 to about 160 micron mms.

o In the fifth step of an embodiment a both-sided pressure- 0000 sensitive adhesive tape is fixed at one adhesive side to S1 4" the flap produced by the third step. As the flap projects from the ply portion, the tape can be easily provided to the flap. Preferably, the tape may be bonded onto the under2ace of the flap, the face located in the direction of the ply portion. Thus, the presence of the tape in this position substantially equalizes the crosswise thickness of the adhesive flap portion to that of the ply portion of the sheet member, facilitating the subsequent step of winding the sheet member against occurrence of skewing of the sheet member being wound, which would be disastrous for the purposes of the winding operation.

In the sixth step of an embodiment, the multiple ply sheet member is wound or coiled into a roll until a predetermined length of sheet has been paid out and rolled, when the same is to be cut off. This provides a final masking sheet product.

In use, the masking sheet can be easily transported to the spot of painting operation, such as windows of a building, as the masking sheet according to the invention is a compact overall size made of a rolled, plied thin film.

o°o Actually, the compact film product may be accommodated in a ao~ painter's pocket for easy transportation or carried by one o000 hand of a painter.

To cover up an area to not be painted, such as window panes, a painter is to press the outer pressure-sensitive o o adhesive layer of the sheet product against the upper transverse side of the window frame for fixing it thereto while the masking sheet is being pulled out from the roll o until it expands over to the other lateral side of the window frame. When the masking sheet comes to the other side of window frame, the sheet is cut off from the roll.

Then, the ply portion can be pulled down and expanded to cover the window overall.

The width of the sheet member may be determined in accordance with the height of windows to be masked.

6 BRIEF DESCRIPTION OF THE DRAWINGS In order that the invention can be more clearly ascertained an example of preferred embodiments will now be described with reference to the accompanying drawings wherein: Fig. 1 is a crosssection of the sheet member.

Fig. 2 is a crosssection showing the operation of the first step of folding the edges back inward into the tubular sheet.

Fig. 3 is a plan view showing the pleating operation of the sheet member.

Fig. 4 is a crosssection of the sheet member cut for flap formation.

Fig. 5 is a crosssection of the sheetmember with an 00 o 15 adhesive tape combined.

0 0 SFig. 6 is an elevational view of the multiple ply sheet oo0 member.

.0, SFig. 7 is a view of the sheet member in use.

DETAILED DESCRIPTION OF THE EMBODIMENTS The accompan:ying drawings consists of Figures 1 to Soo showing a masking sheet as in the steps of a manufacturing 00° method according to the invention, where the thickness is exaggerated and the width is shortened for the purposes of depiction.

°0 o t Fig 1. shows an elongate sheet member formed by a soft o.0. synthetic resin material as thin as 10 to 20 micron mms. in a wide flattened tubular shape.

A method of manufacturing a masking sheet product according to the invention includes a step of pleating the sheet member 1 with the opposite long edges 2 folded back inward the tubular shape.

a.- 7 The operation in this step may be performed by a tool shown in Fig. 3 which includes a pair of shaper plates 3,3 juxtaposed to each other with a gap 4 therebetween. The tubular sheet member 1 inflated by air may be shaped by passing the same through the gap between plates.

The step reduces the width of the sheet member to one half of the original one and folds the lateral edges back into the tubular shape in a crosssection shaped like which is critical for prevention skewing or deformation upon subsequently multiplying plies of the sheet member.

The second step is as shown in Fig. 4, longitudinally, linearly cutting the multiple ply sheet member provided by the first step.

The ply sheet member has four plies and the second ply or layer sheet is cut along a line 5 located slightly inward 00 04 the edge in parallel thereto.

0 0 The operation in this step may be performed with the same 0 device as shown in Fig. 3 but modified simply by adding and o 00 0 appropriately disposing a cutter blade, by passing the sheet ment-r through the gap like in the first step.

0 25 Specifically, the sheet member may extend under tension 6 from the source roll to the location where the final step is done so that the sheet member may be treated continuously in this step by allowing the member running through the gap.

The spacing between the cut line 5 and the edge should be svfficiently great to produce a flap on which a pressuresensitive adhesive tape can be fixed. The method includes the step of opening the flap portion along the cut line Oh. 8 into a position shown in phantom in Fig. 4.

The multiple ply sheet member is then pleated along the central longitudinal axis to produce twice thick multipleply sheet member 7 compared with the original sheet member i! 1. The sheet member 7 consists of 8 plies and is wider by one fourth, thick as 80 to 160 micron mms.

i ii The next step uses a tape 8 as shown in Fig. 5 made of a Ij 10 material or paper tearable by the hand and has one half of one side covered by an adhesive layer 9 and the overall other side covered a pressure-sensitive adhesive layer The layer 9 is adapted to bond the tape onto the flap 11, while the layer 10 remaining exposed.

The tape may be provided in a roll and can be applied to o the sheet member 7 while paid out from the roll in, a simple o manner by pressing the tape against the rearside of the o 0 flap 11 of sheet member 7.

As shown in Fig. 6, the multiple ply sheet member 7 with 0 'o the tape 8 is then wound in a body into a roll and is cut 00 0 after a predetermined length has been coiled, which produces a masking film product 12.

0 a 4 S In use, a painter can press the pressure-sensitive adhesive layer 10 of the tape 8 against one lateral end corner of a window upper frame 14 and expand it over to the other lateral side frame while the same is fixed at the lap portion in order to fix the adhesive layer of the tape onto the overall length of the upper side frame. When this was done, the tape and ply member are torn or cut off. The ply member is then opened or expanded down as shown in phantom in the drawing to cover the window.

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Claims

1. A method for manufacturing a masking film product from a length of an elongate, flattened tubular sheet member formed by a soft synthetic resin film, comprising the steps of: pleating said sheet member with the opposite longitudinal edges folded back into the tubular sheet to a substantially equal distance to produce a multiple-ply sheet member with the width reduced to one half of the width of said flattened tubular sheet; cutting the web of the multiple-ply sheet member along a line parallel to and near one of said longitudinal edges; manipulating the cut edge of the sheet member to produce a flap portion for receiving a pressure-sensitive adhesive; pleating the multiple ply sheet member along a central longitudinal axis to produce a sheet member with the doubled plies; "o 20 applying a both-sided pressure-sensitive adhesive tape on said flap portion with the adhesive layer of the ooaoo tape fixed thereto; and 0 O0 0°au° winding the resultant sheet member in a roll and cutting the sheet member at a determined length.

2. A masking film product manufactured by the method of claim 1. .,9 o° 0

3. A method substantially as herein described with reference to the accompanying drawings. 00 Dated this 24th day of May, 1995. JOHOKU KOGYO CO., LTD. and OWAKI CO., LTD. By their Patent Attorneys: GRIFFITH HACK CO. Fellows Institute of Patent Attorneys of Australia. ABSTRACT A method for manutacturing a masking film product from a length of an elongate, flattened tubular sheet member formed by a soft synthetic resin film, comprising the steps of: pleating said sheet member with the opposite long edges folded back inward the tubular shape to a substantially equal distance to produce a multiple-ply sheet member with the width reduced to one half of the original width; cutting the web of the multiple-ply sheet member a.long and o; ,adjacent one of the long edges; 9 u 0 S 0 opening the cut edge of the sheet member in the outer 0 direction to produce a flap portion for a pressure- 20 sensitive adhesive; pleating the multiple ply sheet member along the central longitudinal axis to produce a sheet member with the doubled plies; applying a both-sided pressure-sensitive adhesive tape on said flap portion with the adhesive layer of the tape fixed 0o'I thereto; and winding the resultant sheet member in a roll and cutting the sheet member at a determined length.