JPH04352608A - Packaging method using low density polyethylene film - Google Patents

Abstract

PURPOSE:To automatically perform packaging of porous buffer material using a low density polyethylene film by a method wherein, while air is blown against a vertically stretched low density polyethylene film to form a space for insertion of porous buffer material, the porous buffer material is carried into said space to wrap around said material with said film and welding both ends of the film. CONSTITUTION:Air is blown from an air blow hole formed in an air feed pipe 6 of a delivery device 3 and at the same time a guide roller 15 is loosened so that a space for insertion of a porous buffer material W is formed inside a low density polyethylene film stretched between a film end gripping bar 17 of a film winding device 16 and a film drawing out bar 18 under air pressure. When the material W which is held by the device 3 and guided over a bottom plate 9 reaches a welding zone, the bar 18 holding the film is lowered so that the film is held between the bars 17,18 to weld the ends of the film by means of a welding device 19 and also melted and divided by said means.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention uses a low-density polyethylene film, which is used when packaging electrical appliances such as televisions, videos, or refrigerators, by stacking a large number of porous cushioning materials and wrapping them with a low-density polyethylene film. It concerns a packaging method.

0002

[Prior Art] A predetermined number of porous cushioning materials formed by a foam molding machine are manually stacked and aligned, and then fed into a packaging machine, where a polyethylene film is manually wrapped around the edges of the film. After arranging the items, they were heat welded and packaged. However, low-density polyethylene film in particular is thin and easily torn, and no technology has been developed that can automatically perform such packaging.

0003

[Problems to be Solved by the Invention] The problem to be solved by the present invention is to provide a method for wrapping a porous cushioning material in a low-density polyethylene film that is thin, easily torn, and difficult to handle without requiring any human labor. That's true.

0004

[Means for Solving the Problems] The present invention involves blowing air onto low-density polyethylene films stretched above and below to form a space for inserting a porous cushioning material, and carrying the porous cushioning material into the space. It is characterized by being wrapped around the body.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in detail below based on the illustrated embodiments. 1 is a conveyor that continuously supplies a large number of porous cushioning materials W stacked in multiple stages to the packaging process; 2 is a conveyor that separates the porous cushioning materials W that are continuously fed in by the conveyor 1 into blocks; This is a separation device that sends the liquid to the upper left in FIG. 1 using a cylinder (not shown).

Reference numeral 3 denotes a delivery device that receives the porous buffer material W separated into blocks by the separation device 2 and delivered to the welding zone H. At the upper and side edges of the holding plate 4 that receives the porous cushioning material W of the delivery device 3, an air supply pipe 6 having a large number of air ejection holes 5 therethrough is provided. When sending out to the welding zone H, air is ejected from the air ejection holes 5 to form a space S into which the low density polyethylene film F stretched vertically is impregnated and into which the porous cushioning material W is inserted.

Reference numeral 7 represents a cylinder for moving the delivery device 3 forward and backward toward the welding zone H, and 9 represents a bottom plate for guiding the porous buffer material W to the welding zone H. Reference numeral 10 denotes a back plate whose height is changed by a cylinder 11 according to an increase or decrease in the number of stacked products to be packaged.
This prevents the porous cushioning material W from tipping over or falling even when the height of the porous cushioning material W changes.

Reference numeral 12 denotes a film supply device that supplies the low density polyethylene film F to the packaging process, and the low density polyethylene film F fed upward from the film roll 13 provided along the side of the device is fed to an oblique guide roller. 14, the direction is changed by 90 degrees and the film is supplied to a film winding device which will be described later. 15 is a guide roller for loosening the film;
By returning the guide roller 15, the film F, which has been pulled out excessively by There is. Therefore, the amount of sliding of the guide roller 15 is changed depending on the height of the porous buffer material W.

Reference numeral 16 denotes a film winding device for winding the low density polyethylene film F around the porous cushioning material W stacked in multiple stages. , and a film drawer bar 18 that can be moved up and down. 19 is a vertically elongated welding device provided in the welding zone H.

0010

[Operation] To carry out the present invention using such a device,
First, the porous cushioning material W stacked in multiple stages and continuously fed by the conveyor 1 is separated into one by the separating device 2.
Only the blocks are separated and sent to the sending device 3. When delivering one block of porous buffer material W fed into the delivery device 3 to the welding zone H, air is ejected from the air jet hole 5 formed in the air supply pipe 6 of the delivery device 3. If the guide roller 15 is loosened at the same time as this air is blown, the porous cushioning material can be applied to the low-density polyethylene film F stretched vertically between the film end gripping bar 17 and the film pull-out bar 18 of the film winding device 16. A space for fitting W is formed by wind pressure.

[0011] Then, the porous buffer material W held by the delivery device 3 and guided on the bottom plate 9, which advances toward this space, advances without touching the low-density polyethylene film F and reaches the welding zone H. do. When the welding zone H is reached, the delivery device 3 is moved back and the porous buffer material W is placed in the welding zone H. After loading, the feeding device 3 is moved backward, and when the backward movement is completed, the film pull-out bar 18 grips the film F and descends to sandwich the film F between the film gripping bar 17 and weld and cut the ends of the film.

[0012] In this way, the semi-wrapped porous cushioning material W is wrapped with the low-density polyethylene film F from above and below.
In the welding zone H, the unwelded open sides are welded by a welding device, and the products are transported completely packaged.

[0013]

Effects of the Invention As is clear from the above description, the present invention involves blowing air onto low-density polyethylene films stretched above and below to form a space for inserting a porous cushioning material. This prevents the thin and easily torn low-density polyethylene film from getting caught and damaged by the edges of the porous cushioning material, the edges of the delivery device, or protrusions when wrapping the packaged products, thereby preventing defective products from being damaged. This can be effectively prevented and the yield can be increased. Therefore, the present invention provides an extremely significant contribution to the industry as a packaging method using low density polyethylene film.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of a packaging device used in the present invention.

FIG. 2 is a side view of the same delivery device.

FIG. 3 is a side view of the delivery device shown in a different state.

[Explanation of symbols]

3 Sending device 5 Air outlet 6 Air supply pipe 16 Film winding device

Claims (1)

[Claims] 1. A low-density polyethylene film, which is characterized in that air is blown onto low-density polyethylene films stretched vertically to form a space for inserting a porous cushioning material, and the porous cushioning material is carried into the space and wrapped. Packaging method using density polyethylene film.