CN117864498A - Method for manufacturing glass article package - Google Patents

Abstract

The invention provides a method for manufacturing a glass article package, which accurately pulls out a strip-shaped protection sheet from a raw material sheet roll in a packaging process after a storage process, and properly and smoothly performs packaging operation. The method for producing a glass article package includes a packaging step of performing a packaging operation using a glass article (G1 (G)) and a protective sheet (S1 (S)), wherein the raw material for the protective sheet (S1 (S)) is a raw material Sheet Roll (SR) formed by winding a strip-shaped protective sheet (S) formed of a resin in a roll shape, the method includes a storage step of storing the raw material Sheet Roll (SR) in a storage space (4) as a pre-step of the packaging step, and when the difference between two lengths L1, L2 of each representative length L in the winding direction of the two ends (Sa, sb) of the strip-shaped protective sheet (S) in the width direction is set to DeltaL, deltaL/L is 0.3% or less for the raw material Sheet Roll (SR) after the storage step.

Description

Method for manufacturing glass article package

Technical Field

The present invention relates to a method for manufacturing a glass article package using a glass article and a protective sheet made of resin.

Background

When a glass article is conveyed, a process of manufacturing a glass article package using the glass article and a protective sheet is performed. As an example thereof, patent document 1 discloses a method for manufacturing a glass article package including a packaging step of stacking glass plates and a protective sheet made of resin on a packaging tray.

Further, this document discloses that the humidity and temperature of a raw material sheet roll (raw material sheet roll obtained by winding a strip-shaped protective sheet in a roll form) as a raw material for the protective sheet are managed by a management step (storage step) of the protective sheet before the packaging step.

Specifically, this document describes storing a plurality of raw material rolls in a management space (storage space) set to a desired humidity and temperature by an air conditioning system. In addition, this document describes that the humidity and temperature of the storage space are adjusted to the same level as the humidity and temperature in the packaging region (packaging unit) in which the packaging process is performed.

On the other hand, as another example of a method for producing a glass article package, it is known to wind a band-shaped glass film in a roll shape in a state where a band-shaped protective sheet is superimposed (for example, refer to patent document 2). In this case, the raw material roll is stored in the storage space before the packaging process.

Prior art literature

Patent literature

Patent document 1: japanese patent application laid-open No. 2021-70534

Patent document 2: japanese patent laid-open publication No. 2017-43366

Disclosure of Invention

Problems to be solved by the invention

However, even when the temperature in the storage space is adjusted by the air conditioning system as disclosed in patent document 1, since the storage period corresponding to one raw material roll is generally long for one or more weeks or two or more weeks, it is difficult to uniformly maintain the temperature in the storage space or the like over the entire period.

In addition, when the belt-shaped protective sheet constituting the raw material sheet roll is formed of a resin, the length in the winding direction thereof is liable to vary with a change in temperature, unevenness, or the like in the storage space. Therefore, during the storage period in the storage step, there is a case where the difference in length between one end portion in the width direction and the other end portion in the width direction in the winding direction of the protective sheet becomes large. In such a case, it is difficult to accurately pull out the tape-shaped protective sheet from the raw sheet roll in the packaging step after the storage step, and a proper and smooth packaging operation is hindered.

In view of the above, an object of the present invention is to properly and smoothly perform a packing operation by accurately pulling out a tape-shaped protective sheet from a raw sheet roll in a packing step after a storage step.

Means for solving the problems

(1) A first aspect of the present invention, which has been made to solve the above-described problems, is a method for producing a glass article package including a packaging step of performing a packaging operation using a glass article and a protective sheet, wherein a raw material for the protective sheet is a raw material sheet roll obtained by winding a tape-shaped protective sheet made of a resin in a roll shape, the method for producing a glass article package including a storage step of storing the raw material sheet roll in a storage space as a preceding step of the packaging step, and Δl/L is 0.3% or less in a case where a difference between two lengths of each representative length L in a winding direction of both ends in a width direction of the tape-shaped protective sheet is Δl for the raw material sheet roll after the storage step.

Here, the reason why Δl/L, which is the ratio of the difference Δl between the two lengths to the representative length L, is set to 0.3% or less for the strip-shaped protective sheet of the raw material sheet roll after the storage step is as follows. That is, as a result of the experiments performed by the present inventors to pull out the tape-shaped protective sheet from the plurality of raw material sheet rolls in the packaging step after the storage step, it was found that if the ratio Δl/L is 0.3% or less, the pull-out operation was accurately performed, and the pull-out failure was less likely to occur. Therefore, when the raw material roll having the above ratio is used after the storage step, the packaging operation can be performed properly and smoothly.

(2) In the configuration of (1) above, the glass article may be a glass plate, the protective sheet may be a cut protective sheet obtained by cutting the tape-shaped protective sheet pulled out from the raw sheet roll by a predetermined length in a winding direction, and the glass article package may be formed by stacking the glass plate and the cut protective sheet on a packing tray.

In this way, the packing work of stacking the glass plate and the cut protection sheet on the packing tray can be performed properly and smoothly.

(3) In the configuration of (2) above, the pulling-out device for pulling out the band-shaped protection sheet from the raw material sheet roll may be configured to pull out the band-shaped protection sheet in a state in which both ends in the width direction of the band-shaped protection sheet are sandwiched.

If both ends in the width direction of the belt-shaped protection sheet are clamped by the pulling-out device in this way, when the difference Δl between the two lengths is large, a slack is generated on one end side of the belt-shaped protection sheet, and a jam or the like is likely to occur in the clamped portion. However, in this configuration, since the raw material roll having the above-described ratio is used, such a problem is avoided.

(4) In the configuration of (1) above, the glass article may be a band-shaped glass film, the protective sheet may be a band-shaped protective sheet wound out from the raw material sheet, and the glass article package may be wound in a roll shape by overlapping the band-shaped protective sheet with the band-shaped glass film.

In this way, the bundling operation of overlapping the band-shaped protective sheet on the band-shaped glass film and winding the band-shaped protective sheet in a roll shape can be performed properly and smoothly.

(5) In the above-described configuration of any one of (1) to (4), it is preferable that in the storage step, the maximum temperature of the raw material roll is 45 ℃ or lower.

When the protective sheet is formed of a resin, dimensional change is more likely to occur as the temperature of the protective sheet in the storage step is higher. According to this structure, the difference Δl between the two lengths can be reduced.

(6) In the above-described configuration (1) to (5), the temperature difference in the width direction of the raw material roll in the storage step is preferably 10 ℃ or less.

In this way, the temperature difference between one end portion in the width direction and the other end portion in the width direction of the raw material sheet roll (belt-shaped protective sheet) can be reduced, and therefore the difference Δl between the two lengths can be further reduced.

(7) In the above-described configuration (1) to (6), in the storage step, the raw material roll is preferably separated from the floor surface and the inner wall surface constituting the storage space by 500mm or more, and the height of the raw material roll when stacked is 2000mm or less from the floor surface.

In this way, the raw material roll is less susceptible to heat radiation from the floor surface and the inner wall surface (the inner wall surface of the side wall portion and the inner wall surface of the top wall portion), and the difference Δl between the two lengths can be reliably reduced.

(8) In the above-described configuration (1) to (7), it is preferable that the raw material roll is shielded from direct sunlight in the storage step.

In this way, the raw material roll does not locally increase in temperature due to the influence of direct sunlight, and therefore the difference Δl between the two lengths can be more reliably reduced.

(9) A second aspect of the present invention, which has been made to solve the above-described problems, is a method for producing a glass article package including a packaging step of performing a packaging operation using a glass article and a protective sheet, wherein a raw material for the protective sheet is a raw material sheet roll obtained by winding a tape-shaped protective sheet made of a resin in a roll shape, and the method for producing a glass article package includes, as a step preceding the packaging step: a storage step of storing the raw material sheet roll in a storage space; and a measurement step of measuring Δl/L for the raw material sheet roll after the storage step, where Δl is the difference between the two lengths of each representative length L in the winding direction of the both widthwise ends of the strip-shaped protection sheet.

According to this configuration, since the measurement step of measuring the ratio Δl/L is included, only the raw sheet roll that has obtained the measurement result that the ratio Δl/L is small can be used in the packaging step. Thus, with this configuration, the packing work can be properly and smoothly performed. The measurement step may be performed by a manual operation performed by an operator or the like, or may be performed using a sensor or the like.

(10) A third aspect of the present invention, which has been made to solve the above-described problems, is a method for producing a glass article package including a packaging step of performing a packaging operation using a glass article and a protective sheet, wherein a raw material for the protective sheet is a raw material sheet roll obtained by winding a tape-shaped protective sheet made of a resin in a roll shape, and the method for producing a glass article package includes, as a step preceding the packaging step: a storage step of storing the raw material sheet roll in a storage space; and a checking step of detecting a difference between two lengths per representative length in a winding direction of both ends in a width direction of the band-shaped protection sheet with respect to the raw material sheet roll after the storing step.

According to this configuration, since the inspection step of detecting the difference between the two lengths is included, only the roll of raw material sheet in which the difference between the two lengths is detected to be small can be used in the packaging step. Thus, with this configuration, the packing work can be properly and smoothly performed. The inspection step may be performed by visual observation by an operator or the like, or may be performed using a sensor or the like.

(11) A fourth aspect of the present invention, which has been made to solve the above-described problems, is a method for producing a glass article package including a packaging step of performing a packaging operation using a glass article and a protective sheet, wherein a raw material for the protective sheet is a raw material roll formed by winding a tape-shaped protective sheet formed of a resin in a roll shape, the method for producing a glass article package including a storage step of storing the raw material roll in a storage space as a preceding step of the packaging step, the packaging step including a pulling step of pulling out the tape-shaped protective sheet from the raw material roll, the pulling step including a checking step of detecting whether or not a pulling-out failure due to a difference between two lengths per representative length in a winding direction of both ends of the tape-shaped protective sheet in a width direction occurs.

According to this configuration, when the tape-shaped protective sheet is pulled out from the raw sheet roll in the pulling-out step, it is detected whether or not a pulling-out failure due to the difference between the two lengths is generated by the inspection step. Therefore, when the occurrence of the pull-out failure is detected in the inspection step, the raw material roll is replaced with another raw material roll, and the subsequent packaging operation can be performed appropriately and smoothly. The inspection step can be performed by visual observation or the like by an operator.

Effects of the invention

According to the present invention, since the tape-shaped protective sheet is accurately pulled out from the raw material roll in the packaging step after the storage step, the packaging operation can be performed properly and smoothly.

Drawings

Fig. 1 is a partially cut-away perspective view showing an implementation of a storage process in a method for manufacturing a glass article package according to an embodiment of the present invention.

Fig. 2 is a plan view showing the form of the raw material roll after the storage step in the method for manufacturing a glass article package according to the embodiment of the present invention.

Fig. 3 is a schematic side view showing the overall structure of a first example of a package body manufacturing apparatus for carrying out the method for manufacturing a glass article package body according to the embodiment of the present invention.

Fig. 4 is a perspective view showing a main part of a first example of a package body manufacturing apparatus for carrying out the method for manufacturing a glass article package body according to the embodiment of the present invention.

Fig. 5 is a perspective view showing a glass sheet package obtained by carrying out the method for manufacturing a glass article package according to the embodiment of the present invention.

Fig. 6 is a bottom view for explaining a first method for measuring the raw material roll measurement ratio Δl/L after the storage step in the method for manufacturing a glass article package according to the embodiment of the present invention.

Fig. 7 is a side view showing a main part of a second example of a package body manufacturing apparatus for carrying out the method for manufacturing a glass article package body according to the embodiment of the present invention.

Fig. 8 is a perspective view showing a band-shaped glass film package obtained by carrying out the method for manufacturing a glass article package according to the embodiment of the present invention.

Fig. 9 is a front view of a band-shaped glass film package for explaining the conventional problem.

Fig. 10 is a perspective view showing a final form of a band-shaped glass film package obtained by carrying out the method for manufacturing a glass article package according to the embodiment of the present invention.

Fig. 11 is a diagram for explaining an embodiment of the present invention.

Description of the reference numerals

1 storage container

2 floor surface

Inner wall surface of 3aa side wall part

Inner wall surface of 3ba top wall portion

4 storage space

13 pullout device

21 tray for packing

22 glass plate package

32 band-shaped glass film package

G-band glass film

G1 glass plate

S-shaped protective sheet

S1 protective sheet (cut protective sheet)

One end of Sa-shaped protective sheet in width direction

Another end part of the Sb-shaped protective sheet in the width direction

And (5) rolling the SR raw material sheet.

Detailed Description

Hereinafter, a method for manufacturing a glass article package according to an embodiment of the present invention will be described with reference to the drawings.

The present manufacturing method is substantially divided into a storage step and a packaging step. The storage step is a step of storing a raw material sheet roll SR as a raw material for a protective sheet S1 (described in detail later) used in the packaging step. The bundling step is a step of performing a bundling operation using the protective sheet S1 cut from the raw sheet roll SR and the glass article after the storage step.

Fig. 1 is a partially cut-away perspective view illustrating an implementation state of a storage process. As shown in the figure, a plurality of raw material rolls SR are stored in a storage container 1 including a warehouse, and the like. In the illustrated example, seven raw material rolls SR are stored, but about several tens of raw material rolls SR may be stored. In the illustrated example, the raw material rolls SR are stacked in two stages, but may be stacked in three or more stages.

The storage container 1 is composed of a floor surface 2 and a wall 3. The wall portion 3 is constituted by four side wall portions 3a and a top wall portion 3 b. Therefore, the storage space 4 in which the plurality of raw material rolls SR are stored is a space surrounded by the floor surface 2, the inner wall surfaces 3aa of the four side wall portions 3a, and the inner wall surface 3ba of the top wall portion 3 b.

In the present embodiment, a plurality of raw material rolls SR are stacked on the mounting table 5. The mounting table 5 is mounted on the floor surface 2 with the spacers 5a interposed therebetween, but may be directly mounted on the floor surface 2.

The raw material sheet roll SR is a raw material sheet roll formed by winding a resin-formed tape-shaped protective sheet S around a winding shaft 6. Specifically, the strip-shaped protective sheet S is composed of a foamed resin sheet of polyethylene or the like or a resin sheet having no foamed structure. The length of the strip-shaped protective sheet S in the winding direction is 350 to 500m, preferably 400 to 450m. The length of the strip-shaped protective sheet S in the width direction is 1 to 4m, preferably 2 to 3m.

The raw material roll SR is stored for one or more weeks or two or more weeks and one month or three months. Here, the storage period means a period from the time when one raw material roll SR is carried into the storage space 4 to the time when it is carried out.

In the storage step, various methods are used as described below. In the following description, the direction along the central axis of the spool 6 of the raw material sheet roll SR is referred to as the width direction.

As a first method, the temperature of the storage space 4 is adjusted so that the maximum temperature of the entire raw material sheet roll SR is preferably maintained at 45 ℃ or lower, more preferably at 40 ℃ or lower. An air conditioning system or the like is used for temperature adjustment of the storage space 4. It should be noted that the temperature of the storage space 4 does not need to be adjusted by an air conditioning system as long as the maximum temperature of all the raw material rolls SR can be maintained at preferably 45 ℃ or less, more preferably 40 ℃ or less.

As a second method, the temperature of the storage space 4 is adjusted so that the temperature difference in the width direction of all the raw material rolls SR is preferably maintained at 10 ℃ or less, more preferably maintained at 5 ℃ or less. Therefore, the temperature difference across the entire width of the raw material sheet roll SR is not more than 10 ℃, more preferably not more than 5 ℃. The temperature difference in the width direction can be set to 10 ℃ or lower by, for example, adjusting the temperature of the storage space 4 using the air conditioning system, controlling the distance between the raw material roll SR and the inner wall surface, and shielding the raw material roll SR from direct sunlight.

As a third method, in the storage space 4, it is preferable that all the raw material rolls SR are separated by 500mm or more, more preferably 300mm or more, from the floor surface 2, the inner wall surfaces 3aa of the four side wall portions 3a, and the inner wall surface 3ba of the top wall portion 3 b. Therefore, the entire raw material roll is hardly affected by heat dissipation from these surfaces 2, 3aa, 3 ba.

As a fourth method, the height from the floor surface 2 when the raw material rolls SR are stacked in the storage space 4 is preferably 2000mm or less, more preferably 1500mm. Therefore, the temperature difference between the uppermost raw material roll SR and the lowermost raw material roll SR is reduced, and the temperature of the storage space 4 is advantageously adjusted so that the maximum temperature of all raw material rolls SR is preferably maintained at 45 ℃ or less, more preferably maintained at 40 ℃ or less.

As a fifth approach, in the holding space 4, the entire raw material roll SR is shielded from direct sunlight. Thus, even if a window is provided in any one of the four side wall portions 3a and the top wall portion 3b, the window is closed off by the gap after being covered with a shutter, a shade, or the like. The carry-in/out port formed in any one of the four side wall portions 3a is closed by a door or the like at a time other than when the raw material roll SR is carried in/out.

By adopting the above-described method, the raw material roll SR that is carried out from the storage space 4 during the end of the storage period is brought into the following form.

That is, as shown in fig. 2, the strip-shaped protective sheet S in the raw sheet roll SR after the storage step may have a difference between the length in the winding direction of the width-direction one end portion Sa and the length in the winding direction of the width-direction other end portion Sb. The difference between the two lengths may occur due to temperature changes, unevenness, or the like in the storage space 4 during the storage period, or due to temperature changes, unevenness, or the like in the manufacturing process or the conveying process of the raw material sheet roll SR.

The figure shows a state in which the start end portion Sx of the winding direction of the tape-shaped protection sheet S is pulled out by the length L from a state along the central axis X of the reel 6. The figure shows that the length of one end portion Sa in the width direction of the strip-shaped protective sheet S in the winding direction is longer than the length of the other end portion Sb in the width direction in the winding direction. Thus, the diameter R1 of the width-direction one end portion SRa of the raw material sheet roll SR is larger than the diameter R2 of the width-direction other end portion SRb. The thickness of one end portion Sa in the width direction of the strip-shaped protective sheet S is larger than the thickness of the other end portion Sb in the width direction. The reason for these cases is that the other end Sb of the strip-shaped protective sheet S in the width direction is larger in shrinkage due to heat than the one end Sa in the width direction during storage in the storage space 4.

In the present embodiment, when the representative length of the strip-shaped protective sheet S is L and the difference between the lengths L1 and L2 of each representative length L of the width-direction both ends Sa and Sb of the strip-shaped protective sheet S is Δl, the Δl/L is 0.3% or less with respect to the raw sheet roll SR after the storage step. That is, the ratio Δl/L obtained by dividing the difference Δl between the length L1 per representative length L of the width-direction one end portion Sa and the length L2 per representative length L of the width-direction other end portion Sb by the representative length L is 0.3% or less. The ratio Δl/L is preferably 0.2% or less, more preferably 0.1% or less. Therefore, the influence of heat on the raw material roll SR during storage in the storage space 4 is extremely small. The representative length L is set with reference to the length in the winding direction at the widthwise central position of the strip-shaped protective sheet S.

Next, a first example and a second example of the packing process included in the present manufacturing method will be described.

Fig. 3 illustrates a first example of a bale manufacturing apparatus 7 for performing the baling process. As shown in the figure, the package manufacturing apparatus 7 includes: a conveying unit 8 for conveying the glass sheet G1; a production unit 9 that produces a cut protection sheet S1 (hereinafter, simply referred to as a protection sheet S1) from the raw material sheet roll SR taken out of the storage space 4 of the self-tube storage 1; and a packing section 10.

The glass sheet G1 is obtained by cutting a strip-shaped glass continuously formed by an off-drawing forming device to a predetermined length in the longitudinal direction and cutting and removing unnecessary portions of both end portions in the width direction. The glass plate G1 has a thickness of, for example, 0.01 to 2mm, and is used for various displays such as a liquid crystal display and an organic EL display, a glass substrate for a solar cell, and a cover glass. The forming apparatus may perform a downdraw process such as an overflow downdraw process or a slot downdraw process, or may perform a process other than the downdraw process, for example, a float process.

The conveying section 8 is configured as a conveying device provided with a plurality of holding sections 11 for moving the glass sheet G1. Each holding portion 11 can be moved three-dimensionally by a robot arm or other various moving mechanisms. Each holding portion 11 has a clamping mechanism 12 capable of holding the glass sheet G1. The conveying unit 2 conveys the glass sheet G1 in the direction indicated by the arrow a in a state where the upper portion of the glass sheet G1 is held by the holding mechanism 12 of the holding unit 11.

The manufacturing unit 9 includes: a pulling-out device 13 that pulls out the strip-shaped protective sheet S from the raw sheet roll SR set at the fixed position; and a cutting device 14 for cutting the pulled-out strip-shaped protection sheet S according to a prescribed length to cut out the protection sheet S1. The raw material roll SR is used immediately after being taken out from the storage space 4 of the storage container 1. The raw material sheet rolls SR are sequentially taken out from the raw material sheet rolls that are earlier in time period from the conveyance to the storage space 4.

As shown in fig. 4, the drawing device 13 includes: a direction switching roller 15 for switching the pulling-out direction of the strip-shaped protective sheet S from the lateral direction to the longitudinal direction; and a pair of pinch rollers 16 that pinch the strip-shaped protective sheet S under the direction conversion roller 15.

The drawer device 13 further includes a pair of upper holding portions 17 and a pair of lower holding portions 18 that are movable in the longitudinal direction. The pair of upper holding portions 17 hold the portions of the strip-shaped protective sheet S that are located relatively above the widthwise ends Sa, sb. The pair of lower holding portions 18 hold the portions of the strip-shaped protective sheet S at the lower sides of the widthwise ends Sa, sb. These holding portions 17 and 18 have holding mechanisms 17a and 18a for holding both widthwise end portions Sa and Sb of the strip-shaped protective sheet S.

The cutting device 14 includes: a back support member 19 for supporting the belt-like protective sheet S from the back side; and a cutting blade 20 disposed on the front side of the back surface support member 19 so as to sandwich the belt-shaped protection sheet S.

The packing unit 10 includes a packing tray 21 mounted on a floor surface. A glass plate G1 and a protective sheet S1 (see fig. 3) are stacked on the packing tray 21.

The first example of the packaging process includes a pulling process. In the drawing step, first, as shown in fig. 4, the pair of lower holding portions 18 standing by in the vicinity of the cutting device 14 hold the both widthwise end portions Sa, sb of the strip-shaped protection sheet S. In this state, the pair of lower holding portions 18 move downward as indicated by the dashed line in the figure, and stop after moving a predetermined distance. This ends the pulling-out process corresponding to one time.

Thereafter, the pair of upper holding portions 17 hold the both widthwise ends Sa, sb of the strip-shaped protective sheet S. Thereby, the strip-shaped protection sheet S is held by the two holding portions 17 and 18 in a state of being pulled downward by a predetermined length from the cutting device 14.

Next, the cutting blade 20 of the cutting device 14 is brought into contact with the strip-shaped protection sheet S, and the strip-shaped protection sheet S is cut over the entire width thereof at a position above the upper holding portion 17. Thereby, the protective sheet S1 is cut out from the strip-shaped protective sheet S. At this time, the protective sheet S1 is held by the two holding portions 17 and 18 at the upper and lower portions of the width-direction both end portions S1a and S1 b. After that, the holding portions 17 and 18 are moved downward, and then the protective sheet S1 is delivered to the other holding portion (not shown) and is subjected to positional adjustment or the like, so that it is loaded on the packing tray 21 in a vertical posture.

Thereafter, the glass sheet G1 conveyed by the conveying section 8 is loaded on the packing tray 21 in a vertical posture. The protective sheet S1 is loaded on the packing tray 21 and the glass sheet G1 is loaded on the packing tray 21 alternately a plurality of times. Thus, the glass sheet package 22 shown in fig. 5 was obtained. The glass plate package 22 is a glass plate package in which a glass plate laminate 23 in which protective sheets S1 and glass plates G1 are alternately laminated is mounted on a packing tray 21.

In the first example of the packaging step, the pulling-out step of the strip-shaped protective sheet S from the raw sheet roll SR is performed as described above, but the pulling-out step is performed appropriately and smoothly. The reason for this is that the above ratio Δl/L is 0.3% or less (or 0.2% or less, or 0.1% or less) at the time when the raw material roll SR is taken out from the storage space 4 of the storage container 1. However, when the ratio Δl/L is assumed to exceed this value, the following problems occur.

That is, when the length in the winding direction of the one end portion Sa in the width direction of the strip-shaped protection sheet S pulled out from the raw sheet roll SR is unreasonably longer than the length in the winding direction of the other end portion Sb in the width direction (when the above-described ratio Δl/L is long enough to deviate from the above-described numerical range), a slack Z as indicated by a chain line in fig. 4 occurs. Specifically, when the lower holding portion 18 moves downward while holding the strip-shaped protective sheet S (when the pulling-out process is being performed), the slack Z occurs at the pulling-out direction upstream side portion of the nip portion between the pair of nip rollers 16 on the side of the one end portion Sa in the width direction of the strip-shaped protective sheet S. Therefore, the belt-like protection sheet S is jammed between the pair of nip rollers 16.

For this problem, countermeasures as shown below can be taken.

As a first countermeasure, a measurement step of measuring the above-mentioned ratio Δl/L is included. The measurement step is preferably performed after the raw material sheet roll SR is taken out of the storage space 4 and before the raw material sheet roll SR is set in the package manufacturing apparatus 7, but may be performed after the raw material sheet roll SR is set in the apparatus 7 and before the packaging step (pulling-out step) is started. In this way, if the raw material roll SR from which the measurement result is obtained such that the ratio Δl/L falls out of the above-described numerical range is replaced with another raw material roll SR, the above-described problems such as clogging do not occur. In addition, the pinching rollers 16 are not damaged by the clogging or the like.

The measurement step is performed by the following method. That is, as shown in fig. 6, first, when the starting end portion Sx of the raw material sheet roll SR in the winding direction of the strip-shaped protective sheet S is located at the position shown by the chain line, a first straight line X1 extending in the same direction and at the same position as the central axis X of the reel 6 when viewed from the direction orthogonal to the paper surface is drawn over the entire width direction. Next, after the strip-shaped protective sheet S is pulled out by the length L, a second straight line X2 extending in the same direction and positioned at the same position as the central axis X of the reel 6 when viewed from the direction orthogonal to the paper surface is drawn over the entire length in the width direction. Then, a linear distance L3 between an intersection Xa of the one end portion Sa in the width direction of the pulled-out strip-shaped protection sheet S intersecting the first straight line X1 and an intersection Xb intersecting the second straight line X2 is measured. Next, a linear distance L4 between an intersection Xc of the width-direction other end Sb and the first straight line X1 and an intersection Xd of the width-direction other end Sb and the second straight line X2 is measured. The measurement may be performed by a manual operation by an operator, or may be performed by using a sensor or the like. The difference Δl between the measured length L3 and the length L4 is calculated, and the ratio Δl/L is obtained by dividing the difference Δl by the representative length L. The representative length L in this case is a linear distance between the center of the first straight line X1 and the center of the second straight line X2.

As a second countermeasure against the above-described problem, a first inspection step is provided that detects a difference between two lengths of each representative length L in the winding direction of the width-direction both ends Sa, sb of the strip-shaped protection sheet S in the raw sheet roll SR. The first inspection step is preferably performed after the raw material sheet roll SR is taken out of the storage space 4 and before the raw material sheet roll SR is set in the package manufacturing apparatus 7, but may be performed after the raw material sheet roll SR is set in the apparatus 7 and before the packaging step (pulling-out step) is started. In this way, the raw material roll SR from which the inspection result is obtained such that the difference between the two lengths is not reasonable is replaced with another raw material roll SR, and the above-described problems such as clogging can be avoided. In this case, whether or not the above-described unreasonable difference (for example, a difference in the degree of relaxation Z as shown by a chain line in fig. 4) is present may be determined by visual observation or manual work by an operator, or may be determined by using a sensor or the like.

As a third countermeasure against the above-described problem, the drawing step includes a second inspection step of detecting whether or not a drawing failure is generated due to a difference between two lengths of each representative length L in the winding direction of the width-direction both ends Sa, sb of the strip-shaped protection sheet S. In the second inspection step, whether or not a pull-out failure such as a jam of the belt-like protection sheet S between the pair of pinch rollers 16 due to a slack Z shown by a chain line in fig. 4, for example, occurs due to the difference between the two lengths is detected. The detection may be performed by visual observation by an operator, or may be performed using a sensor or the like that detects a load acting on the pinch roller 16. In this way, when the occurrence of the pull-out failure is detected, the packaging process is interrupted and the raw material roll SR is replaced with another raw material roll SR, so that damage, breakage, and the like of the pull-out device 13 due to the occurrence of any of the above-described jams and the like can be prevented.

Fig. 7 illustrates a second example of a bale manufacturing apparatus 25 for performing the baling process. As shown in the figure, the package manufacturing apparatus 25 includes: a conveying unit 26 for conveying the belt-shaped glass film G continuously formed by an off-drawing forming device; a cut-out portion 27 for cutting out an unnecessary portion of the carried ribbon glass film G; and a packing section 28.

The ribbon glass film G has a thickness of 300 μm or less, and is used for glass substrates and cover glasses for various displays such as liquid crystal displays and organic EL displays, and for solar cells. The forming apparatus may perform a downdraw process such as an overflow downdraw process or a slot downdraw process, or may perform a process other than the downdraw process, for example, a float process.

The conveying section 26 includes a conveyor 29 for conveying the ribbon glass film G in the lateral direction (horizontal direction).

The cut-out portion 27 includes a laser 30 for cutting out both widthwise end portions (unnecessary portions) Gx of the ribbon glass film G. The ablation using the laser 30 is performed by, for example, a laser ablation method or the like. Thus, the unnecessary portion Gx is disconnected from the effective portion Ga of the ribbon glass film G. The unnecessary part Gx after the disconnection falls downward from the conveyor 29 and is discarded.

The packaging unit 10 includes a winding core 31 wound with the band-shaped protective sheet S pulled out from the raw sheet roll SR in a state where the band-shaped glass film G (effective portion Ga) is conveyed. In this case, the raw material roll SR is also used immediately after being taken out from the storage space 4.

In the second example of the packaging step, the pulling-out step of the strip-shaped protective sheet S from the raw sheet roll SR is continuously performed, and the strip-shaped glass film package 32 shown by a solid line in fig. 8 is obtained. As shown by a chain line in the figure, the length of the band-shaped protective sheet S in the width direction of the band-shaped glass film package 32 is longer than the length of the band-shaped glass film G in the width direction, but the lengths of both the protective sheets S, G in the width direction may be the same or the length of the band-shaped protective sheet S in the width direction may be shorter than the length of the band-shaped glass film G in the width direction.

In the second example of the packaging process, the pulling-out process of continuously pulling out the strip-shaped protective sheet S from the raw sheet roll SR is performed as described above, but the pulling-out process is performed appropriately and smoothly. The reason is the same as in the case of the first example.

However, when the length of the one end portion Sa in the width direction of the strip-shaped protection sheet S pulled out from the raw sheet roll SR in the winding direction is unreasonably longer than the length of the other end portion Sb in the width direction (when the above-described ratio Δl/L is out of the above-described numerical range), a winding shift Z1 as shown in fig. 9 occurs. Specifically, the end face 32a of the band-shaped glass film package 32 is not planar but is tapered as shown in the figure.

As a first countermeasure against this, the same measurement process as in the case of the first example can be performed. The measurement step can be performed in the same manner at the same timing as in the case of the first example.

In addition, as a second countermeasure, the first inspection step similar to the first example may be performed. The first inspection step may be performed in the same manner at the same timing as in the case of the first example.

As a third countermeasure, a second inspection step similar to the first example may be performed. In the second inspection step, the pull-out failure caused by the winding displacement Z1 can be detected at the initial stage of the pull-out step. Therefore, when the pull-out failure is detected, the packaging process is interrupted, and the raw material roll SR is replaced with another raw material roll SR, so that the subsequent packaging process can be performed properly and smoothly. The second inspection may be performed by visual observation by the process operator, or may be performed using a sensor or the like for detecting the winding displacement Z1.

As shown in fig. 10, flanges 33 may be attached to both axial ends of the winding core 31 as a final form of the band-shaped glass film package 32.

[ example ]

First example

Fig. 11 is a graph showing experimental results obtained by the present inventors on the relationship between the storage temperature of the raw material roll SR and the above-described ratio Δl/L. In addition to the experimental results, table 1 below shows experimental results obtained by the present inventors on the relationship between the above-described ratio Δl/L and whether or not pull-out failure occurred in the pull-out step. In this experiment, a constant temperature bath was prepared in which a volume of one raw material roll SR could be stored. The constant temperature tank is configured to maintain a constant storage temperature in the tank for a long period of time of one month or more. In the experiment, the temperatures in the thermostats were maintained at temperatures within the interval of 25 to 60 ℃ for each 5 ℃ for each of the eight raw material rolls SR and stored for one month. The first example of the above-described packaging process is performed for the eight raw material rolls SR after storage, and whether or not a pull-out failure occurs is detected. The pull-out failure here is the occurrence of clogging caused by the occurrence of the slack Z shown in fig. 4. In table 1 below, "≡o" means that no pull-out failure occurred, and "×" means that a pull-out failure occurred.

[ Table 1 ]

Storage temperature (. Degree. C.)	ΔL/L(％)	Poor pullout
			25	0	○
30	0	○
			35	0	○
40	0	○
			45	0.04	○
50	0.4	×
			55	0.6	×
60	0.8	×

As a result of the experiment, as shown in the graph of fig. 11 and table 1, the above ratio Δl/L was zero when the temperature in the constant temperature tank was set to 40 ℃ or less, but significantly increased when the temperature was set to a temperature exceeding 45 ℃. Thus, it was found that when the raw material sheet SR is stored in the storage space 4, the storage temperature should be set to 45 ℃ or lower as described above.

As shown in table 1, when the ratio Δl/L is 0.4% or more, a pull-out failure occurs. Thus, it can be understood that if the ratio Δl/L is 0.3% or less as described above, no pull-out failure occurs. It can be estimated that the same applies to whether or not the pull-out failure caused by the winding shift Z1 shown in fig. 9 occurs in the case where the second example of the packaging process is performed.

Second example

Table 2 below shows the relationship between the temperature difference in the width direction of the raw material roll SR and the ratio Δl/L during storage and the relationship between the ratio Δl/L and the pull-out failure in examples 1, 2, and 3 and comparative examples 1, 2, and 3 of the present invention. Here, the temperature difference in the width direction of the raw material roll SR can be obtained as a result of measuring the highest temperature and the lowest temperature in the width direction of the raw material roll SR as shown in table 2 below. The description about the pull-out failure shown in table 2 is the same as the description about the pull-out failure shown in table 1.

[ Table 2 ]

From table 2, the temperature difference (difference between the highest temperature and the lowest temperature) in the width direction of the raw material roll SR was 10 ℃ or lower in each of examples 1, 2 and 3. In contrast, in comparative example 1, the temperature difference in the width direction of the raw material roll SR exceeded 10 ℃. Examples 1, 2 and 3 each had a Δl/L of 0.3% or less before the storage step. In contrast, in comparative example 2, Δl/L exceeded 0.3% from the time of storage. Examples 1, 2 and 3 all had a storage period of three months or less. In contrast, comparative example 3 was stored for more than three months. In relation to these cases, examples 1, 2 and 3 each had a Δl/L after the storage step of 0.3% or less, but comparative examples 1, 2 and 3 had a Δl/L after the storage step of more than 0.3%. In the relation to these cases, the pull-out failure did not occur in each of examples 1, 2 and 3, but the pull-out failure occurred in comparative examples 1, 2 and 3. From the above results, when the temperature difference in the width direction of the raw material roll SR is 10 ℃ or less, as described above, Δl/L before the storage step is 0.3% or less, and the storage period is three months or less, Δl/L after the storage step is 0.3% or less. Thus, it can be grasped that the pull-out failure does not occur.

Claims (11)

1. A method for manufacturing a glass article package includes a packaging step of performing a packaging operation using glass articles and a protective sheet,

the method for manufacturing the glass article package is characterized in that,

the raw material piece of the protective sheet is a raw material sheet roll formed by winding a strip-shaped protective sheet formed by resin into a roll shape,

the method for producing the glass article package includes a storage step of storing the raw material sheet roll in a storage space as a step preceding the packaging step,

when the difference between the two lengths of each representative length L in the winding direction of the two ends of the strip-shaped protective sheet in the width direction is Δl, Δl/L is 0.3% or less with respect to the raw material sheet roll after the storage step.

2. The method of manufacturing a glass article package according to claim 1, wherein,

the glass article is a glass plate, and the protective sheet is a cut protective sheet obtained by cutting the tape-shaped protective sheet pulled out from the raw sheet roll by a predetermined length in a winding direction,

the glass article package is formed by stacking the glass plate and the cut protection sheet on a packing tray.

3. The method of manufacturing a glass article package according to claim 2, wherein,

the pulling-out device for pulling out the band-shaped protection sheet from the raw material sheet roll pulls out the band-shaped protection sheet in a state of clamping both ends in the width direction.

4. The method of manufacturing a glass article package according to claim 1, wherein,

the glass article is a ribbon-shaped glass film, and the protective sheet is the ribbon-shaped protective sheet drawn from the raw material sheet roll,

the glass article package is formed by overlapping the band-shaped protective sheet with the band-shaped glass film and winding the band-shaped protective sheet in a roll shape.

5. The method for producing a glass article package according to any one of claims 1 to 4, wherein,

in the storage step, the maximum temperature of the raw material roll is 45 ℃ or lower.

6. The method for producing a glass article package according to any one of claims 1 to 4, wherein,

in the storage step, the temperature difference in the width direction of the raw material roll is 10 ℃ or less.

7. The method for producing a glass article package according to any one of claims 1 to 4, wherein,

in the storage step, the raw material roll is separated from a floor surface and an inner wall surface constituting the storage space by 500mm or more, and a height of the raw material roll when stacked is 2000mm or less from the floor surface.

8. The method for producing a glass article package according to any one of claims 1 to 4, wherein,

in the storage step, the raw material roll is shielded from direct sunlight.

9. A method for manufacturing a glass article package includes a packaging step of performing a packaging operation using glass articles and a protective sheet,

the method for manufacturing the glass article package is characterized in that,

the raw material piece of the protective sheet is a raw material sheet roll formed by winding a strip-shaped protective sheet formed by resin into a roll shape,

the method for manufacturing the glass article package includes, as a step preceding the packaging step:

a storage step of storing the raw material sheet roll in a storage space; and

and a measurement step of measuring Δl/L for the raw material sheet roll after the storage step, where Δl is the difference between two lengths of each representative length L in the winding direction of the tape-shaped protective sheet at both ends in the width direction.

10. A method for manufacturing a glass article package includes a packaging step of performing a packaging operation using glass articles and a protective sheet,

the method for manufacturing the glass article package is characterized in that,

the raw material piece of the protective sheet is a raw material sheet roll formed by winding a strip-shaped protective sheet formed by resin into a roll shape,

the method for manufacturing the glass article package includes, as a step preceding the packaging step:

a storage step of storing the raw material sheet roll in a storage space; and

and a checking step of detecting a difference between two lengths per representative length in a winding direction of both ends in a width direction of the strip-shaped protection sheet with respect to the raw material sheet roll after the storing step.

11. A method for manufacturing a glass article package includes a packaging step of performing a packaging operation using glass articles and a protective sheet,

the method for manufacturing the glass article package is characterized in that,

the raw material piece of the protective sheet is a raw material sheet roll formed by winding a strip-shaped protective sheet formed by resin into a roll shape,

the method for producing the glass article package includes a storage step of storing the raw material sheet roll in a storage space as a step preceding the packaging step,

the packaging step includes a pulling step of pulling the tape-shaped protective sheet from the roll of the raw sheet,

the pulling-out step includes a checking step of detecting whether or not pulling-out failure is generated due to a difference between two lengths per representative length in a winding direction of both ends in a width direction of the tape-shaped protection sheet.