JPH06266060A - Adhesive tape for photographic film after development, and joining and peeling method using the same - Google Patents

Abstract

PURPOSE:To join one developed photographic film without adjusting the shape of the top and rear ends of the film during splicing and to peel the film without leaving an adhesive on the film by using a specified acryl adhesive. CONSTITUTION:An acryl adhesive having 0.17-0.34 DMA an delta which shows correlation with peeling length under static load is used as the adhesive for an adhesive tape 2. The splicing tape 2 has a two-layer structure of a base 3 and a binder layer 4 applied on the base. The base 3 is a polyester film cut in to a rectangular shape. Since the adhesive layer 4 is not wholly applied on the base 3, the base 3 is devided into a coated area 5 where the adhesive layer 4 is applied and a noncoated area 6. The splicing tape 2 is adhered and held on the separater 7. Since the noncoated area 6 is formed on the splicing tape 2, the tape 2 can be easily peeled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive tape for developed photographic film, and a joining and peeling method using the same.

[0002]

2. Description of the Related Art 1 stored in a cartridge after shooting
The photographic film of this line is cut into 6 frames in short when the developing and printing processes are performed at the developing place. After this, the short-length developed photographic film is stored in the photographic film storage sheet and returned to the user together with the print photograph. When a user requests reprinting, a splicing work is performed at the photofinishing station to increase the work efficiency of reprinting by joining the short-length developed photo film with an edge splicing tape to make it long. After this, the elongated developed photographic film is set in the printer, and the necessary portions are reprinted. After completion of reprinting, the long developed photographic film is peeled off from the edge splicing tape to be separated into the original short developed photographic film.

[0003]

By the way, the above-mentioned return of the developed photographic film is carried out in the form of a sheet, so that there is a problem that it is bulky. In order to solve this problem, one developed photographic film is wound around a spool without being cut into units of 6 frames.
The applicant of the present invention has proposed a system for storing and returning a compact storage container described in No. 9441.
Further, in this container, one spool of developed photographic film can be cued by rotating the spool without opening and closing the lid. For this reason, as shown in FIG. 4, the developed photographic film for one line has the shape of the leading end that allows the head to be located, and the shape of the trailing end that facilitates engagement with the spool.

The above-mentioned splicing work is carried out also when reprinting such a developed photographic film, but a flat cutting like a developed photographic film having a short front and rear end shape. Since it is not a surface, there arises a problem that the conventional narrow edge splice tape cannot be used as it is. For this reason, a method of using a conventional edge splicing tape after cutting the front end and the rear end of one developed photographic film to make the shape of the front end and the rear end flat , After reprinting,
In order to make the shapes of the front end and the rear end as shown in FIG. 4, there is a problem that the front end and the rear end must be cut again, which is troublesome. Further, in this method, since the cut is performed twice for each reprint, there is a problem that the length of the photographic film is shortened and the number of re-punting is limited.

In addition, without the above-mentioned cutting, a wide edge splicing tape is used for the splicing work.
There is also a method of joining multiple developed photo films for one line and peeling off the edge splicing tape after reprinting to separate it into one original developed photo film. The glue of the edge splice tape may remain on the edges, and if it is stored in the storage container as it is, the leading edge or the trailing edge may stick to the roll-shaped photographic film, making it impossible to locate the head. .

The present invention has been made in consideration of the above-mentioned conventional techniques, and it is possible to join one developed photographic film without adjusting the shapes of the front and rear ends during the splicing work. An object of the present invention is to provide a pressure-sensitive adhesive tape which can be peeled off without adhering a glue to a developed photographic film, and a joining and peeling method using the same.

[0007]

In order to achieve the above object, in the invention described in claim 1, the value of DMAtan δ showing a correlation with the constant load peeling length is 0.17 to 0.34 as an adhesive of an adhesive tape. The acrylic adhesive is used as follows. In the invention according to claim 2, the support of the pressure-sensitive adhesive tape is provided with a coated portion coated with an acrylic pressure-sensitive adhesive and an uncoated portion to facilitate peeling of the pressure-sensitive adhesive tape from the developed photographic film. .

According to the third aspect of the present invention, the end portion of another developed photographic film is superposed on the leading end portion of one developed photographic film, and then the uncoated portion is removed. The developed photographic films are joined to each other through the coating portion so that the overlapped end portions face each other. Furthermore, in the invention of claim 4, the long photographic film joined by the joining method of claim 3 is fed with the uncoated portion at the top, and the end portion of the tip portion of the developed photographic film is fed. After separating from the rear end, the joint between the coated part and the front end is released, and then the uncoated part is separated from the end of the developed photo film, and the joint between the coated part and the rear end is released. I am trying to do it. In the present invention, an adhesive tape with a separator,
What is also called a splicing label is also included in the adhesive tape of the present invention.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 shows a splicing tape of the present invention used during a reprint splicing operation. This splicing tape 2 has a two-layer structure of a base 3 and a pressure-sensitive adhesive layer 4 coated at 25 g / m ² on the base 3, and the base 3 has a thickness of, for example, 0. A 075 mm polyester film is used. Since the pressure-sensitive adhesive layer 4 is not coated on the entire surface of the base 3, the base 3 is divided into a coated portion 5 on which the pressure-sensitive adhesive layer 4 is coated and an uncoated portion 6. The splicing tape 2 is adhered and held by the separator 7 shown by the chain double-dashed line in the figure, but since the splicing tape 2 has the uncoated portion 6, it can be easily peeled off.

2 and 3 show a developed photographic film storage container (hereinafter referred to as a developed film storage container). This developed film storage container 10 has 6
This is a return container that is used in place of the film storage sheet that stores a short-length developed photo film (hereinafter referred to as a developed film) that has been cut into individual frames. The developed film 11 that is not cut is stored. The developed film storage container 10 includes an outer case 12, an inner case 13 housed in the outer case 12, and a spool 14 rotatably housed in the inner case 13. The developed film 11 is housed in the spool 14. Is wrapped around. Further, the outer case 12 is formed with an opening 15 for rotating the spool 14.

In the developed film storage container 10, the developed film 11 is housed up to the leading end thereof, and when the developed film 11 is taken out, the spool 14 is rotated. When the spool 14 is rotated, the tip of the developed film 11 is sent out of the outer case 12 as shown in FIG. Therefore, as shown in FIG. 4, the shape of the tip portion 16 of the developed film 11 is cut into a streamline shape which is convenient for delivery, and the rear end portion 17 is easily locked to the spool 14. It is cut into a tapered shape. Further, a pair of openings 18 are formed in the rear end portion 17, and the openings 18 are used when the developed film 11 is locked to the spool 14.

The splicing tape 2 is used for reprinting the developed film 11 and for splicing to join the developed film 11 to produce a long developed film. In this splicing work, the emulsion surface 11
The developed film 11 is fed with "a" facing downward and the leading end portion 16 at the front. When the rear end portion 17 reaches the joining position, the next developed film 11 is fed in the same manner as shown in FIG.
And as shown in FIG. 6, its leading end 16 is the leading trailing end 1
Stacked on 7. The splicing tape 2 with the pressure-sensitive adhesive layer 4 on top is pressed against the overlapped portion from the lower side. At the time of this pressing, the uncoated portion 6 is performed so as to face the trailing end portion 16.

In this state, the leading rear end 17 is sandwiched between the splicing tape 2 and the trailing front end 16. For this reason, even if a curl is formed in the rear end portion 17 when stored in the developed film storage container 10, since it is corrected by being pinched, the front end portion 16 and the rear end portion are The part 17 comes into close contact with the part 17, and the rear end part 17 is rolled up from the front end part 16 during feeding,
They do not peel off.

The long developed film thus joined is wound on a roll, set in a printer and fed, and necessary frames are reprinted. When the reprinting is performed, the elongated developed film is wound on another roll. This reel is set in the automatic peeling machine.

7 and 8 show the automatic peeling machine. This automatic peeling machine has a first separating portion 21 for peeling the front end portion 16 from the splicing tape 2 and a second separating portion 22 for separating the splicing tape 2 from the rear end portion 17 and adhering it to the separator 7. It is composed of.
The first separating portion 21 is a roller 2 that abuts the elongated developed film from the side to which the splicing tape 2 is joined.
3 and a pair of rollers 24 and 25 for separating the tip portion 16 from the splicing tape 2.

The second separating section 22 contacts the base surface of the developed film 11 and a pair of separating rollers 27 and 28 for separating the splicing tape 2 from the developed film 11, and the roller 23 directs the feeding direction. Changing roller 29
And a pair of rollers 30 contacting both sides of the separator 7,
It is composed of 31. The rollers 24, 25, 2
Each of the rollers 7 and 29 is movable, and its movement is sequence-controlled by a control mechanism (not shown).

When the long developed film is supplied from the reel to the automatic peeling machine, the long developed film is bent at right angles by the rollers 23 and 29 in the feeding direction. Then, when the splicing tape 2 passes the roller 23, since the front end of the developed film 11 is not joined to the rear end portion, the splicing tape 2 goes straight and is nipped by the rollers 24 and 25. After that, the preceding developed film 11 is fed downward and the succeeding developed film 11 is fed rightward. As a result, the tip portion 16 is peeled off from the splicing tape 2.

When the tip of the developed film 11 fed rightward is nipped by a roller (not shown), the roller 2
5 is moved in the axial direction and set to the retracted position. In the developed film 11 fed downward, the uncoated portion 6 of the developed film 11 is rotated by the roller 28 in the counterclockwise direction.
Will be sent in between. Thereafter, the roller 28 is used to move the rear end portion 1
The coating part 5 peeled off from 7. It is sent between the rollers 27 and 28. The splicing tape 2 thus peeled off is separated by the separator 7 fed by the roller pair 30, 31.
Affixed to. The splicing tape 2 adhered to the separator 7 is collected, and the developed film 1 is recovered.
Used for joining 1. When the rear end of the developed film 11 passes the roller 29, the roller 29 is moved in the axial direction and then moved to the position of the roller 24.

During this time, the roller 24 of the first separating section 21 is moved to the position of the roller 29. When the roller 29 is moved to the position of the roller 24, the roller 25 is moved from the retracted position and set to the position shown in the figure. Then, with the rollers 25 and 29, the next developed film 11 is formed.
Ready to nip the tip of. By repeating this,
The long developed film is sequentially peeled off the splicing tape 2 to be separated into the original developed film 11.

In this way, when the adhesive has adhered to the separated developed film 11, the developed film storage container 10 stores the developed film 11 by winding it around the spool 14, so that the leading end portion is stored. 16 and the rear end portion 17 may be joined to the roll surface of the developed film 14. In this case, even if the spool 14 is rotated, the tip portion 16 cannot be sent out of the outer case 12. Therefore, the adhesive layer 4 needs to be such that the adhesive does not adhere to the developed film 11 even if the splicing tape 2 is peeled off.

Among the pressure-sensitive adhesives, acrylic pressure-sensitive adhesives have already been used as they do not adversely affect the unexposed film. By the way, since the splicing tape 2 is used a plurality of times, among the acrylic pressure-sensitive adhesives, an acrylic pressure-sensitive adhesive using a isocyanate-based curing agent as a main agent is a acrylate ester having a functional group of a hydroxyl group type and a large molecular weight. Samples A to E of the splicing tape 2 were manufactured by coating A to E, respectively. Acrylic adhesive A used for this splicing tape 2
The components of E are shown below.

(Acrylic Adhesive A) n-butyl acrylate 83 parts by weight acrylic acid 8 parts by weight vinyl acetate 8 parts by weight 2-hydroxyethyl acrylate 1 part by weight 45% ethyl acetate solution 1 containing this acrylic copolymer 1
With respect to 00 parts, an isocyanate cross-linking agent [Coronate L
(Manufactured by Nippon Polyurethane Industry Co., Ltd.)] 2 parts were added to obtain an acrylic pressure-sensitive adhesive A. (Melamine-based resins, epoxy-based resins, and chelates may be used as the cross-linking agent. The same applies to the following adhesives.)

(Acrylic adhesive B) n-butyl acrylate 60 parts by weight ethyl acrylate 30 parts by weight acrylic acid 7 parts by weight 2-hydroxyethyl acrylate 3 parts by weight 40% ethyl acetate solution containing this acrylic copolymer 1
With respect to 00 parts, an isocyanate cross-linking agent [Coronate L
(Manufactured by Nippon Polyurethane Industry Co., Ltd.)] 3 parts was added to obtain an acrylic pressure-sensitive adhesive B.

(Acrylic pressure-sensitive adhesive C) n-butyl acrylate 50 parts by weight 2-ethylhexyl acrylate 40 parts by weight Methyl methacrylate 5 parts by weight 2-hydroxyethyl methacrylate 3 parts by weight This acrylic copolymer is 40% ethyl acetate solution containing 1
Isocyanate type cross-linking agent [Coronate L
(Manufactured by Nippon Polyurethane Industry Co., Ltd.)] 4 parts was added to obtain an acrylic pressure-sensitive adhesive C.

(Acrylic pressure-sensitive adhesive D) n-butyl acrylate 81.9 parts by weight ethyl acrylate 10 parts by weight vinyl acetate 8 parts by weight 2-hydroxyethyl methacrylate 0.1 parts by weight This acrylic copolymer is included. 45% ethyl acetate solution 1
With respect to 00 parts, an isocyanate cross-linking agent [Coronate L
(Manufactured by Nippon Polyurethane Industry Co., Ltd.)] 2 parts were added to obtain an acrylic pressure-sensitive adhesive D.

(Acrylic adhesive E) n-butyl acrylate 50 parts by weight 2-ethylhexyl acrylate 40 parts by weight methyl methacrylate 5 parts by weight acrylic acid 4.8 parts by weight 2-hydroxyethyl methacrylate 0.2 Part by weight 40% ethyl acetate solution containing this acrylic copolymer 1
Isocyanate type cross-linking agent [Coronate L
(Manufactured by Nippon Polyurethane Industry Co., Ltd.)] 3 parts was added to obtain an acrylic pressure-sensitive adhesive E.

With respect to these acrylic adhesives A to E, a dynamic viscoelasticity measuring device such as Dubon 983 DMA is used.
Using a measuring machine, DMAtan δ at 100 ° C
Was measured. The measurement result is 0.15,0.1
The values were 9, 0.30, 0.40 and 0.48. 1
It is described in JP-A-3-177473 that the value of DMAtan δ at 00 ° C. shows a high correlation with the constant load peel length indicating peeling and adhesive force.

Using Samples A to E, 100 developed films 11 were joined together to prepare five types of elongated developed films, which were wound up on rolls. 30 rolls of each of these 5 types were prepared, and these rolls were set in a printer and fed, and the presence or absence of peeling of Samples A to E was observed. The observation result is as shown in FIG. 9, and in the roll using the sample A, peeling occurred in 7 reels in the first feeding.

For the reels using Samples B to E, after feeding, the samples B to E were peeled off respectively and the presence or absence of adhesive residue was observed. There has occurred. Furthermore, in the reel using the sample E, adhesive residue was generated on 25 reels. With the reels using samples B and C, joining, feeding and peeling were performed twice, but neither peeling nor adhesive residue occurred.

Similar tests were repeated for other acrylic pressure-sensitive adhesives. As a result, the value of DMAtan δ was 0.17-
In the range of 0.34, the adhesive tape 2 is the developed film 1
It was found that the adhesive film 2 was not peeled off from No. 1 and no adhesive residue was left on the developed film 11 when the adhesive tape 2 was peeled off.

[0031]

As described above, the adhesive tape for a developed photographic film according to claim 1 has an acrylic adhesive having a DMAtan δ value of 0.17 to 0.34 which correlates with the constant load peel length. Since the agent is used, the developed photographic film joined with this adhesive tape does not peel off during feeding, and when peeled off, no adhesive residue is generated on the developed photographic film.

The developed photographic film pressure-sensitive adhesive tape according to claim 2 has a support provided with a coated portion coated with an acrylic pressure-sensitive adhesive and an uncoated portion. This can be easily done when peeling from. In the method for joining the adhesive tape for a developed photographic film according to claim 3, the developed photographic film is superposed on the end portion of another developed photographic film,
After that, since the developed photographic films are joined through the coated part so that the uncoated part faces the overlapped end part, even if curl is formed at the rear end part, The curl can be pinched and corrected by the end portion of the finished photographic film and the adhesive tape, and the adhesion at the joint can be improved.

In the method for peeling off the adhesive tape for a developed photographic film according to claim 4, the long photographic film joined by the adhesive tape is fed with the uncoated portion at the top, and the developed photographic film is fed. After separating the end of the front end of the film from the rear end, the joint between the coated part and the front end is released, and then the uncoated part is separated from the end part of the developed photographic film, and the coated part Since the joining with the rear end portion is released, the automation suitability at the time of peeling can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing a splicing tape of the present invention.

FIG. 2 is a perspective view showing an appearance of a developed film storage container.

FIG. 3 is a sectional view showing the inside of a developed film storage container.

FIG. 4 is a cutaway view of a developed film joined with a splicing tape.

FIG. 5 is a plan view showing a state in which two developed films are joined with a splicing tape.

FIG. 6 is a side view showing a state in which two developed films are joined with a splicing tape.

FIG. 7 is an explanatory diagram showing a state in which the front end portion of the developed film is peeled off from the splicing tape at the first separating portion of the automatic peeling machine.

FIG. 8 is an explanatory diagram showing a state in which the splicing tape is peeled off from the rear end portion of the developed film in the second separating portion of the automatic peeling machine.

FIG. 9 is a diagram showing test results of peeling and adhesive residue of the splicing tape of the present invention.

[Explanation of symbols]

 2 Splicing tape 3 Base 4 Adhesive layer 5 Coated part 6 Uncoated part 10 Developed film storage container 11 Developed film 16 Tip part 17 End part 21 First separation part 22 Second separation part

Claims (4)

[Claims] 1. A DMAtan showing a correlation with a constant load peeling length.
When δ is measured at 100 ° C. using a DMA measuring instrument manufactured by DuPont, the value of DMAtan δ is 0.17 to
An adhesive tape for a developed photographic film, which has an acrylic adhesive layer of 0.34. 2. The adhesive tape is composed of a coated part made of a support coated with an acrylic adhesive and an uncoated part made of only the support. The adhesive tape for developed photographic film according to 1. 3. A developed photographic film is superposed on the leading end of another developed photographic film, and after that,
The developed photographic film is joined by using the adhesive tape according to claim 2 through the coated part so that the uncoated part faces the overlapped end part. How to join photo films. 4. The long photographic film joined by the joining method according to claim 3 is fed with the uncoated portion at the top, and the end portion of the front end portion of the developed photographic film is separated from the rear end portion. After doing
The joint between the coated portion and the front end portion is released, after which the uncoated portion is separated from the end portion of the developed photographic film, and the joint between the coated portion and the rear end portion is released. The method for peeling off the developed photographic film adhesive tape according to 2.