JPH0243706Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in a heating device for a laminator that heats two sheets of plastic film and seals the films by sandwiching a sheet to be sealed between the two sheets of plastic film.

Plastic film is heated to a temperature that allows it to be uniformly fused using a rotating heating roller, but since it is thin before reaching the pressure roller, it may not be uniform if the heat is partially removed by cold air or wind. Sealing becomes impossible.

Furthermore, since rotating heating rollers and pressure rollers are located in the sheet insertion section, there is a risk that the hem of the worker's clothes or necktie may get caught, and furthermore, these rollers may be heated. There is a risk of getting burned if you touch the sheet when inserting the sheet.

An object of the present invention is to provide a laminator having a heating space cover that can solve the above problems at the same time.

The configuration of the laminator according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of a laminator according to the present invention, showing a state in which a plastic film is stretched on the laminator. The plastic films 1, 1' are, for example, transparent films laminated with polyethylene and Mylar, and are wound around a pair of upper and lower supply reels (or cassettes), not shown.

The intermediate rollers 2, 2' change the running direction of the films 1, 1' unwound from the supply reel so that the film 1, 1' remains in contact with rotating heating rollers 3, 3', which will be described later, for a longer period of time. It is for the purpose of

A pair of upper and lower rotating heating rollers 3, 3' of the same type are
A heating element 17 is installed inside and heats the films 1, 1' in contact with the heating element 17 to a temperature at which they can be fused. Since the circumferential speed of the heating rollers 3, 3' and the transfer speed of the films 1, 1' are the same, they are transferred while rolling in contact with each other without causing any slippage.
It reaches 5'.

A pair of heating members 4, 4' such as strip heaters are disposed near the pressure rollers 5, 5'.

In this case, the films 1 and 1', which have been heated to a temperature where they can be fused by the heating rollers 3 and 3', are transferred to the pressure rollers 5 and 3'.
This is to preheat the pressure rollers 5, 5' so that heat is absorbed by the rollers 5' and the temperature does not drop.

The pressure rollers 5, 5' are each made of a hollow cylinder made of a material having heat resistance and elasticity, such as silicone rubber, which is fitted onto a core shaft, and its surface is finished to be smooth.

On the other hand, the sheet 7, which is the object to be sealed and placed on the insertion table 6 and whose sides are regulated by the guide plate 8, is being preheated by absorbing heat from the covers 11 and 11' which are heated to some extent. When inserted between two sheets of film 1, 1' stretched by a pair of upper and lower pressure rollers 5, 5', the pressure rollers 5, 5'
At the same time, the films 1 and 1' are pressed together from above and below, and the periphery of the film, which is slightly larger than the sheet 7, is heat-sealed. Note that by appropriately selecting the type of films 1, 1' and the heating temperature, it is possible to fuse one or both of films 1, 1' and sheet 7. The films 1 and 1' with the sheet 7 sealed are
It is held between a pair of upper and lower drawer rollers 9, 9' and led out to the left outlet to complete the sealing process.

A blower 10 is disposed near the upper rotating heating roller 3, heating member 4, and pressure roller 5, and a blower 10 is disposed near the lower rotating heating roller 3', heating member 4', and pressure roller 5'. , and a blower 10' are provided, and upper and lower heating space covers 11 and 11' are provided to surround these. Cover 11,1
Film inlet ports 11a and 11'a are provided above and below 1', and the sheet insertion port 15 and the film drawer port 16 sealed with the sheet are slightly spaced apart from each other. An upper cover 11 and a lower cover 11' are attached. Therefore, the uniformly heated films 1, 1' reach the pressure rollers 5, 5' without being exposed to cold air or wind outside the heating space, so that uniform sealing can be achieved. Further, the thermal energy radiated from the rotating heating rollers 3, 3' and the heating members 4, 4' is convected within the heating space cover by the blowers 10, 10', so that the entire film is heated uniformly. Furthermore, rotating heating rollers 3, 3' and pressure rollers 5,
5', it prevents the worker's clothes from getting caught or getting burnt by touching the worker's hands.

Furthermore, if a cooling fan is installed behind the pressure roller to quickly cool down the sealed film, the cold air will hit the heated film before sealing and cool it, making it difficult to achieve satisfactory sealing. However, by covering as described above, this problem can also be resolved.

Cooling fans 12, 12' with their discharge ports facing the film surface are disposed above and below the film transport path between the film drawer opening 16 with the sealed sheet and the drawer rollers 9, 9'. Since the films 1, 1' and the sheet 7 sealed at high temperature are rapidly cooled, the films 1, 1', etc. taken out from the laminator can be immediately touched.

The rotating heating rollers 3, 3', the pressure rollers 5, 5', and the pull-out rollers 9, 9' are driven by a drive motor 13 via a chain, timing belt, or the like.

Guide roller 14 provided near the sheet insertion opening 15
is provided because it is easy to touch the hot covers 11, 11' when the sheet 7 is directly inserted between the pressure rollers 5, 5', and when the sheet 7 is pressed against the insertion table 6. It serves as a guide between the pressure rollers 5 and 5'. Note that cover 11,1
The guide roller 14 may be omitted if a heat insulating material is pasted to 1' or a heat insulating material is used.

To describe the operation of the laminator according to the present invention having the above configuration, first, the plastic sheets 1 and 1' are mounted on the supply reel, the winding ends are let out, and the intermediate rollers 2 and 2' are rolled. Rotating heating roller 3,
3', crimping rollers 5, 5', pull-out rollers 9, 9'
Expand in this order.

Next, the switches for supplying electricity to the heating elements 17, 17' and the heating members 4, 4' are closed. After a predetermined period of time, the drive motor 13, blower 10, 10', cooling fan 1
When the switch that energizes films 2 and 12' is closed, films 1 and 1' are fed out at the same speed.
After being heated to the melting temperature while in contact without slipping with the rotating heating rollers 3, 3' heated by the heating elements 17, 17', the heating elements 4,
The pressure rollers 5, 5' are preheated to a certain temperature by rollers 4'. On the other hand, the sheet 7 to be sealed is placed on the insertion stand 6 outside the heating space covers 11, 11', and when it is inserted into the sheet insertion opening 15 with one or both sides of the sheet in contact with the guide plate 8, the sheet 7 is a pressure roller 5, which is sandwiched between the films 1 and 1' being transferred and stretched in a V-shape;
The periphery of the film or the film and the sheet are fused under appropriate pressure between 5'.

The films 1, 1' with the sheet 7 sealed thereto are spread out on the pull-out rollers 9, 9' while being passed through the cooling fan 1.
After being cooled by the cold air from the sheets 7, the films 1, 1' are sent out from the pull-out rollers 9, 9', and are automatically or manually cut into units of the sheets 7 using appropriate cutters. Finish the work by cutting.

As is clear from the above detailed description, the laminator according to the present invention is provided with a heating space cover so as to surround the rotating heating roller, the pressure roller, and the heating member, and this cover includes the minimum required Because the opening is provided, the uniformly heated film reaches the pressure roller without being exposed to cold air or wind outside the heating space, allowing for uniform sealing. This also has the effect of preventing accidents such as burns caused by contact with the roller surface.

[Brief explanation of the drawing]

The drawing is a longitudinal sectional view showing an embodiment of a laminator according to the present invention. 1, 1'...Plastic film, 3, 3'...
...Rotating heating roller, 4, 4'...Heating member, 5,
5'...Crimping roller, 7...Sheet, 9,9'...
Drawer roller, 10, 10'...Blower, 11,
11'... Heating space cover, 11a, 11'a...
Film intake port, 15...Sheet insertion port, 1
6... Film drawer opening, 17... Heating element.

Claims (1)

[Claims for Utility Model Registration] (1) A pair of rotating heating rollers, each of which is equipped with a heating element, and a pair of pressure rollers that press a plastic film heated by the rotating heating rollers together with a sheet to be sealed. a heating member for preheating each of the pressure rollers, a pair of draw-out rollers for pulling out the plastic film with the sheet sealed from the pressure roller, the rotating heating roller, the pressure roller and Surrounding the heating member are upper and lower plastic film lead-in ports, sheet insertion ports, and the pair of crimping rollers.
and a heating space cover having a drawer opening for a film sealed with a sheet provided between the pair of drawer rollers.
Laminator with. (2) A laminator having a heating space cover according to claim 1, wherein a blower for causing convection of heat generated from a heating member and a heating element is disposed within the heating space cover.