Device and method for opening plastic bag
A plastic bag opening device, which opens an inlet of a plastic bag having a pocket shape, includes an elevating member that lifts the plastic bag in a state in which a first surface of the plastic bag is adhered; and an air blower that injects air toward the inlet of the plastic bag adhered to the elevating member so that the inlet of the plastic bag is opened. Accordingly, the inlet of the plastic bag may be completely opened.
1. A plastic bag opening device configured to open an inlet of a plastic bag having a pocket shape, the plastic bag opening device comprising:
a lifter configured to lift the plastic bag in a state in which a first surface of the plastic bag is adhered to the lifter;
an air blower configured to inject air toward the inlet of the plastic bag adhered to the lifter so that the inlet of the plastic bag is opened;
a pair of fingers configured to be inserted into the inlet of the plastic bag adhered to the lifter to pull and expand the inlet of the plastic bag in opposite directions; and
a movable member configured to move the lifter away from the pair of fingers such that the inlet of the plastic bag is expanded between the pair of fingers and the lifter.
2. The plastic bag opening device of claim 1 , wherein the lifter comprises:
an adherence pad configured to adhere to the first surface of the plastic bag; and
an elevating part configured to cause the adherence pad to ascend so as to lift the plastic bag adhered to the adherence pad up to an imaginary horizontal line at which the air blower is disposed.
3. The plastic bag opening device of claim 2 , wherein the air blower comprises:
an injection nozzle configured to inject the air toward the inlet of the plastic bag so that the inlet of the plastic bag is opened, the injection nozzle having an air injection opening configured to be inclined downward at a set angle with respect to the imaginary horizontal line; and
a frame to which the injection nozzle is coupled.
4. The plastic bag opening device of claim 3 , wherein the set angle is set to 3° to 10°.
5. The plastic bag opening device of claim 2 , wherein the air blower comprises:
a frame; and
an injection nozzle configured to inject the air toward the inlet of the plastic bag so that the inlet of the plastic bag is opened, the injection nozzle being coupled to the frame so that an angle of the injection nozzle with respect to the frame is adjustable up and down or left and right.
6. The plastic bag opening device of claim 1 , further comprising a rotator configured to rotate the lifter so that the inlet of the plastic bag adhered to the lifter faces upward.
7. A plastic bag opening method that opens an inlet of a plastic bag having a pocket shape, the plastic bag opening method comprising:
an elevating process of adhering a first surface of the plastic bag to a lifter and then lifting the plastic bag using the lifter;
an opening process of opening the inlet of the plastic bag using an air blower to inject air toward the inlet of the plastic bag adhered to the lifter so that the air injected from the air blower flows into the plastic bag through the inlet;
after the rotating process, a primary expanding process of pulling and expanding the inlet of the plastic bag in opposite directions by inserting a pair of fingers into the inlet of the plastic bag adhered to the lifter and moving the pair of fingers in directions that are away from each other; and
after the primary expanding process, a secondary expanding process of expanding the inlet of the plastic bag between the pair of fingers and the lifter using a movable member to move the lifter away from the pair of fingers.
8. The plastic bag opening method of claim 7 , wherein, in the elevating process, the lifter lifts the plastic bag up to an imaginary horizontal line at which the air blower is disposed, and
wherein, in the opening process, the air blower injects the air toward the inlet of the plastic bag so that the air is injected downward at a set angle with respect to the imaginary horizontal line.
9. The plastic bag opening method of claim 8 , wherein the set angle is set to 3° to 10°.
10. The plastic bag opening method of claim 7 , further comprising, after the opening process, a rotating process of rotating the lifter using a rotator so that the inlet of the plastic bag adhered to the lifter is disposed to face upward.